WO2016104422A1 - Procédé de fabrication de tissu non tissé élastique - Google Patents

Procédé de fabrication de tissu non tissé élastique Download PDF

Info

Publication number
WO2016104422A1
WO2016104422A1 PCT/JP2015/085667 JP2015085667W WO2016104422A1 WO 2016104422 A1 WO2016104422 A1 WO 2016104422A1 JP 2015085667 W JP2015085667 W JP 2015085667W WO 2016104422 A1 WO2016104422 A1 WO 2016104422A1
Authority
WO
WIPO (PCT)
Prior art keywords
nonwoven fabric
gear
stretchable
pair
roll
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2015/085667
Other languages
English (en)
Japanese (ja)
Inventor
橋本　達也
哲郎 大窪
奐奐 陳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unicharm Corp
Original Assignee
Unicharm Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Unicharm Corp filed Critical Unicharm Corp
Priority to CN201580070959.5A priority Critical patent/CN107109734B/zh
Priority claimed from JP2015248236A external-priority patent/JP6357462B2/ja
Publication of WO2016104422A1 publication Critical patent/WO2016104422A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
    • D04H1/43835—Mixed fibres, e.g. at least two chemically different fibres or fibre blends
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
    • D04H1/43825—Composite fibres
    • D04H1/43828—Composite fibres sheath-core

Definitions

  • the present invention relates to a method for producing a stretchable nonwoven fabric.
  • Patent Document 1 discloses a technique for improving stretchability by stretching a non-woven fabric by interposing a belt-shaped non-woven fabric sheet between a pair of tooth-gap rolls having mutually engaging tooth grooves.
  • the technique which manufactures the nonwoven fabric from which a stretching property differs partially is disclosed by using a tooth gap roll from which a draw ratio differs partially.
  • the stretchable nonwoven fabric that can be produced by the method described in Patent Document 1 has strong shrinkability, when used for an exterior member such as a diaper, it becomes easy to bite into the user's skin or is provided in the diaper. Problems such as shrinking the absorber may occur. Therefore, an elastic nonwoven fabric in which the contraction force is appropriately adjusted by providing not only a region having a high contraction force but also a region having a low contraction force is desired.
  • the present invention has been made in view of the above problems, and the object of the present invention is to provide a stretchable region having a high shrinkage force region and a low shrinkage force region while having good stretchability. It is in providing a non-woven fabric.
  • a main invention for achieving the above object is to provide a transporting process for transporting a nonwoven fabric containing stretchable fibers having stretchability and an extensible fiber having lower shrinkage than the stretchable fibers in the transport direction, and the nonwoven fabric.
  • a non-woven fabric is stretched in the transport direction after the first processing step of extending at least a part of the extensible fibers by passing between a pair of first gear rolls, and after the first processing step.
  • the non-woven fabric is stretched by passing between a pair of second gear rolls having a portion where teeth are formed on the peripheral surface and a portion where teeth are not formed, and at least And a second processing step of cutting some of the stretchable fibers.
  • FIG. 1 is a schematic perspective view of a stretchable nonwoven fabric 1.
  • FIG. It is a figure explaining the structure of the manufacturing apparatus 100 which manufactures the elastic nonwoven fabric 1.
  • FIG. 4 is a schematic side view showing the configuration of a first gear machining unit 120.
  • FIG. 4 is an enlarged view showing a region ⁇ in FIG. 3.
  • FIG. 5 is a schematic side view showing a configuration of a second gear machining unit 140.
  • FIG. 5 is a schematic diagram illustrating the configuration of a gear roll 246. It is a figure represented about the area
  • FIG. It is a figure explaining extending
  • a method for producing a stretchable nonwoven fabric comprising: 2 processing steps.
  • a stretchable nonwoven fabric in which the strength of the shrinkage force in the low shrinkage region is weaker than the strength of the shrinkage force in the high shrinkage region can be produced. Accordingly, it is possible to provide a stretchable nonwoven fabric having a region having a high shrinkage force and a region having a low shrinkage force while having good stretchability.
  • the stretchable fiber is easily stretched by being heated and is not easily cut in the second processing step.
  • the stretchable fiber is heated, it is distorted or deteriorated, and is easily cut. This makes it possible to efficiently cut some stretchable fibers without cutting the extensible fibers, and accurately produce a stretchable nonwoven fabric having a region having a high shrinkage force and a region having a low shrinkage force. It becomes possible.
  • the teeth of the pair of second gear rolls are preferably formed so as to be convex toward the outside of the peripheral surface.
  • the nonwoven fabric is deformed into a three-point bend by the peak portions of teeth adjacent to each other in one gear roll and the peak portion of the other gear roll entering the valley portion therebetween.
  • the stretchable fiber can be stretched in the stretching and conveying direction.
  • the tension can be adjusted so that the nonwoven fabric does not break by changing the shallowness of gear engagement or changing the tooth shape or pitch. This makes it easy to produce a high-quality stretchable nonwoven fabric.
  • teeth of one side of the gear roll are formed to be convex toward the outer side of the peripheral surface, and the pair of second gear rolls.
  • the teeth of the gear roll on the other side are formed to be concave toward the outer side of the peripheral surface.
  • the nonwoven fabric is bent in a three-point bend shape by the crest portions of the teeth adjacent to each other in the gear roll on one side and the crest portion of the gear roll on the other side entering the trough portion therebetween. It is deformed and the stretchable fiber can be stretched in the stretching and conveying direction. Moreover, since the tooth
  • the nonwoven fabric is predetermined by a pair of drive rolls provided between the pair of first gear rolls and the pair of second gear rolls in the conveying direction.
  • the nonwoven fabric is transferred to the other side of the pair of second gear rolls by a press roll that is transported in the transport direction at a speed and provided downstream of the pair of drive rolls in the transport direction. It is desirable to stretch the nonwoven fabric in the transport direction by transporting the nonwoven fabric in the transport direction at a speed faster than the predetermined speed while pressing against the outer peripheral surface.
  • the other-side gear roll of the pair of second gear rolls conveys the nonwoven fabric by rotating the nonwoven fabric around at least a part of its peripheral surface. It is desirable to convey in the direction.
  • the nonwoven fabric is wound around a part of the outer peripheral surface of a gear roll having teeth that are concave toward the outside of the outer peripheral surface of the pair of second gear rolls and rotated.
  • the nonwoven fabric can be transported smoothly.
  • a nonwoven fabric can be pinched
  • the thickness of the tip of the tooth of the other side of the pair of second gear rolls is the thickness of the one side of the pair of second gear rolls. It is desirable that it is thicker than the thickness of the tooth tip.
  • the teeth of the pair of second gear rolls are arranged along a direction parallel to the CD direction.
  • the nonwoven fabric transported in the transport direction is easily stretched with a uniform force between the teeth of two gear rolls adjacent to each other in the transport direction. It becomes difficult to occur.
  • the fibers constituting the stretchable nonwoven fabric are long fibers, and two or more of the long fibers are bonded to each other by a plurality of pressure bonding points.
  • the stretchable fibers are long fibers, at least a part of the stretchable fabric is easily arranged along the transport direction, and the nonwoven fabric is easily stretched in the transport direction. Moreover, since several long fibers are mutually crimped
  • the second processing step includes the pair of second gear rolls having teeth having a pitch wider than the shortest distance between the two crimping points adjacent in the transport direction. It is desirable to be performed using.
  • the stretchable nonwoven fabric 1 is a fabric that exhibits stretchability in a predetermined direction by subjecting the nonwoven fabric sheet S to a stretching process described later.
  • the stretchable fibers 2 having stretchability and the extensible fibers 3 having lower shrinkage than the stretchable fibers 2 are mixed, and the stretchable fibers 2 and the stretchable fibers 3 are constant.
  • FIG. 1 is a schematic perspective view of the stretchable nonwoven fabric 1.
  • the stretchable nonwoven fabric 1 is a flat strip-shaped sheet member having a longitudinal direction and a transverse direction that intersects the longitudinal direction, and is long in the longitudinal direction. Moreover, let the direction which each cross
  • the stretchable fibers 2 constituting the stretchable nonwoven fabric 1 (nonwoven fabric sheet S) are elastically stretchable thermoplastic elastomer fibers, such as urethane elastomer, polystyrene elastomer, polyolefin elastomer, polyamide elastomer, and polyester.
  • Fibers such as elastomers can be used.
  • a polyurethane elastomer can be used.
  • the extensible fiber 3 is a fiber made of a thermoplastic resin that has extensibility but is substantially inelastic and hardly shrinks.
  • a single fiber such as polypropylene fiber or polyethylene fiber, or a composite of a core-sheath structure made of polypropylene or polyethylene Fiber etc. can be used.
  • polypropylene which is a polyolefin resin can be used.
  • the nonwoven fabric sheet S is comprised by these fibers being intertwined at random.
  • the nonwoven fabric sheet S can be changed, whereby the stretchability of the nonwoven fabric sheet S is expressed and the nonwoven fabric sheet 1 can be used. A specific method for expressing the stretchability of the nonwoven fabric sheet S will be described later.
  • the stretchable nonwoven fabric 1 of this embodiment has stretchability in the vertical direction and the horizontal direction.
  • the stretchable nonwoven fabric 1 has a high shrinkage region HS that expresses a strong shrinkage force when stretched in the longitudinal direction, and a low shrinkage that has a weak shrinkage force when stretched in the longitudinal direction compared to the high shrinkage region HS.
  • the regions LS are alternately provided along the vertical direction (see FIG. 1). Since the high shrinkage region HS and the low shrinkage region LS are arranged side by side in this way, when the nonwoven fabric sheet S is stretched in the vertical direction, there are portions that are likely to shrink and portions that are difficult to shrink. Will do. Therefore, by appropriately changing the size of the high shrinkage region HS and the low shrinkage region LS and the range to be formed, it is possible to adjust the magnitude of the shrinkage force when the stretchable nonwoven fabric 1 is in the stretched state.
  • FIG. 2 is a diagram illustrating the configuration of the manufacturing apparatus 100 that manufactures the stretchable nonwoven fabric 1.
  • the manufacturing apparatus 100 includes a transport mechanism CV, a heating unit 110, a first gear processing unit 120, a stretching processing unit 130, a second gear processing unit 140, and a sheet member bonding unit 150. .
  • the transport mechanism CV is a transport unit that continuously transports the nonwoven fabric sheet S along a predetermined transport path.
  • the transport mechanism CV for example, a transport roller, a suction belt conveyor having a suction holding function on a belt surface as a placement surface, or the like is used.
  • the nonwoven fabric sheet S is conveyed in a predetermined conveyance direction as a continuous sheet continuous in the vertical direction.
  • the elastic nonwoven fabric 1 is manufactured by performing various processes mentioned later, such as a heat processing and an extending
  • the continuous sheet of the nonwoven fabric sheet S to be conveyed is referred to as a nonwoven fabric continuous sheet Sa.
  • the conveyance direction set on the manufacturing apparatus 100 is also referred to as “MD direction”.
  • the MD direction changes depending on the location. That is, the direction in which the nonwoven fabric continuous sheet Sa is conveyed is not necessarily a fixed direction.
  • one of the two directions intersecting (orthogonal) with the MD direction is referred to as “CD direction”, and the other is referred to as “Z direction”.
  • the CD direction is a direction parallel to the width direction of the nonwoven fabric continuous sheet Sa
  • the Z direction is a direction parallel to the thickness direction of the nonwoven fabric continuous sheet Sa.
  • the nonwoven fabric continuous sheet Sa is fed out from a raw fabric roll in which the nonwoven fabric continuous sheet Sa is wound in a roll shape.
  • the fed nonwoven fabric continuous sheet Sa is transported from the upstream side to the downstream side in the MD direction by the transport mechanism CV at a predetermined transport speed V1, and reaches the position where the heating unit 110 is disposed.
  • the heating unit 110 heats the conveyed nonwoven fabric continuous sheet Sa with a plurality of heating rollers (heating process).
  • the heating unit 110 of the present embodiment has four heating rollers 111 to 114.
  • the heating rollers 111 to 114 are cylindrical transport rollers having a smooth outer peripheral surface, and a heater is provided on the outer peripheral surface.
  • the nonwoven fabric continuous sheet Sa is conveyed from the heating roller 111 on the upstream side in the MD direction to the heating roller 114 on the downstream side in the MD direction while being wound in a substantially S shape around the outer peripheral surface of each of the heating rollers 111 to 114 in the sheet state.
  • the heater is heated by the heater provided on the outer peripheral surface.
  • the heaters provided on the outer peripheral surfaces of the heating rollers 111 to 114 can adjust the heating temperature of the nonwoven fabric continuous sheet Sa by adjusting the amount of heat generated.
  • the temperature at which the nonwoven fabric continuous sheet Sa is heated varies depending on the fiber configuration of the nonwoven fabric continuous sheet Sa, but when the above-described thermoplastic polypropylene is used, the temperature is equal to or lower than the melting point based on the melting point of the polypropylene fiber. Adjusted.
  • the temperature of the nonwoven fabric continuous sheet Sa is preferably equal to or lower than the melting point of the polypropylene fiber and 40 ° C. or higher. Below 40 ° C., the extensibility of the fibers is poor and the strength tends to decrease.
  • the temperature is adjusted so that the heating temperature by the heating unit 110 is 50 ° C. to 60 ° C.
  • the heating process is not an essential process, and the stretchable nonwoven fabric 1 can be manufactured even when heating is not performed.
  • FIG. 3 is a schematic side view illustrating the configuration of the first gear machining unit 120.
  • FIG. 4 is an enlarged view showing a region ⁇ in FIG.
  • the first gear processing unit 120 includes a guide roller 121 and a pair of gear rolls 125 and 126 (first gear roll) (see FIG. 1).
  • the guide roller 121 is provided between the heating unit 110 and the pair of gear rolls 125 and 126 in the MD direction, and includes a plurality of transport rollers that rotate around a rotation axis along the CD direction.
  • the circumferential speed value V121 of the guide roller 121 is substantially the same as the transport speed value V1 of the nonwoven fabric continuous sheet Sa transported from the upstream process. Accordingly, the guide roller 121 can guide the nonwoven fabric continuous sheet Sa to the gear rolls 125 and 126 in a state where the nonwoven fabric continuous sheet Sa is not stretched and is not loosened.
  • the gear rolls 125 and 126 are a pair of upper and lower roll mechanisms that rotate around a rotation axis along the CD direction with their outer peripheral surfaces facing each other.
  • crests 125m and troughs 125v are alternately formed along the rotation direction, and the crests 125m and the troughs 125v are formed to extend in the CD direction.
  • the peak part 125m and the trough part 125v do not need to be formed in the whole CD direction of the gear roll 125, and a part area
  • mountain portions 126m and valley portions 126v are alternately formed on the outer peripheral surface of the gear roll 126.
  • the gear rolls 125 and 126 are rotating, the crest portions 125m and the trough portions 126v are engaged with each other with a slight gap so that the crest portion 125m of one gear roll 125 enters the trough portion 126v of the other gear roll 126. It has become.
  • the nonwoven fabric continuous sheet Sa passes between the pair of gear rolls 125 and 126 along the MD direction.
  • the nonwoven fabric continuous sheet Sa that is passing between the pair of gear rolls 125 and 126 is adjacent to each other in the one gear roll 126, and the peak portion 125m of the other gear roll 125 that enters the trough portion 126v. And is deformed into a three-point bending shape (see FIG. 4).
  • the portion Sa12 that comes into contact with the top surface of the mountain portion 126m of the one gear roll 126 is in contact with the top surface so as not to be relatively movable, and thus is not easily stretched.
  • a portion Sa11 between two adjacent Sa12 and Sa12 is extended based on the intrusion of the mountain portion 125m. As a result, as shown in FIG.
  • the nonwoven fabric continuous sheet Sa has the stretched first portions Sa11 and the second portions Sa12 that are not stretched more than the first portions Sa11 arranged alternately in the MD direction. Processed. And in the area
  • the formation pitch Pv in the rotation direction of the valley portion 125v is the formation pitch Pm in the rotation direction of the mountain portion 125m (the peak of the mountain portion 125m). It is equivalent to the pitch Pm) on the surface.
  • the pitches Pv and Pm of the gear rolls 125 and 126 have the same value.
  • each tooth (the height from the top surface of the mountain portion 125m to the top surface of the valley portion 125v) is preferably equal to or greater than the pitch Pm, and is 5.0 mm in this embodiment. Further, the meshing height between the mountain portion 125m and the mountain portion 126m is 4.0 mm.
  • the nonwoven fabric continuous sheet Sa is heated in advance and the temperature is increased in the heating step described above, the extensible fibers 3 are easily deformed and easily stretched. Thereby, the fracture
  • the nonwoven fabric continuous sheet Sa is conveyed downstream in the MD direction and stretched in the MD direction (longitudinal direction) by the stretching unit 130 (stretching step).
  • the stretch processing unit 130 includes an upstream nip roll 131 and a downstream nip roll 132 (see FIG. 2).
  • the upstream nip roll 131 is a pair of upper and lower rollers capable of adjusting the peripheral speed value, and is continuously driven by a predetermined peripheral speed value V131 while sandwiching the nonwoven fabric continuous sheet Sa between the outer peripheral surfaces of the nonwoven fabric continuous sheet Sa.
  • the sheet Sa is conveyed downstream in the MD direction at the conveyance speed of V131.
  • the downstream nip roll 132 is a pair of upper and lower rollers similar to the upstream nip roll 131, and is driven and rotated at a predetermined peripheral speed value V132 to move the nonwoven fabric continuous sheet Sa downstream in the MD direction at the conveyance speed of V132. Transport.
  • the peripheral speed value of each nip roll is adjusted so that the conveyance speed V132 of the nonwoven fabric continuous sheet Sa by the downstream nip roll 132 is faster than the conveyance speed V131 of the nonwoven fabric continuous sheet Sa by the upstream nip roll 131. ing.
  • the nonwoven fabric continuous sheet Sa after passing through the stretched portion 130 is stretched in the MD direction at a predetermined magnification.
  • This draw ratio is determined according to the elastic limit of the stretchable fiber 2 constituting the nonwoven fabric continuous sheet Sa. Specifically, the draw ratio is determined so that the stretchable fiber 2 is stretched to such an extent that plastic deformation does not occur.
  • the stretchable fiber 2 when the length in the MD direction of the nonwoven fabric continuous sheet Sa in the no-load state is 1.0, the MD is about 2.5 times longer. Stretched in the direction. Thereby, the elastic fiber 2 will be in the state fully extended to the extent which does not fracture
  • FIG. 5 is a schematic side view illustrating the configuration of the second gear machining unit 140.
  • the second gear machining unit 140 has a pair of gear rolls 145 and 146 (second gear roll).
  • the pair of gear rolls 145 and 146 is a pair of upper and lower roll mechanisms that rotate about the rotation axis along the CD direction while facing each other's outer peripheral surfaces in substantially the same manner as the gear rolls 125 and 126 of the first gear processing unit 120. is there.
  • the gear rolls 145 and 146 of the second gear machining unit 140 are different from the gear rolls 125 and 126 of the first gear machining unit 120 in that they have a portion where teeth are formed on the outer peripheral surface and a portion where teeth are not formed. .
  • tooth surfaces 145ts that are regions where teeth are formed and smooth surfaces 145fs that are regions where teeth are not formed are alternately arranged. Then, on the tooth surface 145ts, crests 145m and troughs 145v are alternately formed along the rotation direction.
  • tooth surfaces 146ts which are regions where teeth are formed and smooth surfaces 146fs which are regions where teeth are not formed are alternately formed. And the tooth
  • the tooth surface 145ts of the gear roll 145 and the tooth surface 146ts of the gear roll 146 are arranged at positions facing each other. Thereby, when the gear rolls 145 and 146 rotate, the teeth of each other mesh with each other. Further, the smooth surface 145fs of the gear roll 145 and the smooth surface 146fs of the gear roll 146 are also arranged at positions facing each other.
  • the nonwoven fabric continuous sheet Sa passes between the pair of gear rolls 145 and 146 along the MD direction.
  • the nonwoven fabric continuous sheet Sa passes between the smooth surfaces 145fs and 146fs, since the teeth are not formed in the region, the nonwoven fabric continuous sheet Sa passes directly downstream in the MD direction without being stretched. That is, the area
  • FIG. This region becomes the high shrinkage region HS of FIG.
  • the non-woven fabric continuous sheet Sa passes between the tooth surfaces 145ts and 146ts,
  • the non-woven fabric continuous sheet Sa has three ridges 146m, 146m adjacent to each other in one gear roll 146 and the ridge 145m of the other gear roll 145 entering the valley 146v therebetween, as described in FIG. It is deformed into a point bend.
  • the stretchable fibers 2 that have been stretched to the vicinity of the elastic limit in the stretching step are further stretched until they are 4.0 times or more the length of the unwoven continuous sheet Sa in an unloaded state. Thereby, at least a part of the stretchable fibers 2 is cut, and the low shrinkage region LS of FIG. 1 is formed.
  • the shrinkage force due to the stretchable fiber 2 is less likely to be generated, and the shrinkage force in the MD direction is weaker than that in the high shrinkage region HS. .
  • the meshing height between the mountain part 125m and the mountain part 126m is 1.5 mm, and the meshing height (4. 0 mm), the meshing is shallower. Thereby, the tension is adjusted so that the nonwoven fabric continuous sheet Sa itself is not broken while the elastic fiber 2 is broken.
  • the height, shape, and pitch of the mountain portion 125m (126m) are appropriately changed according to the type of fiber that constitutes the nonwoven fabric continuous sheet Sa.
  • tooth surfaces 145ts (146ts) and smooth surfaces 145fs (146fs) are alternately formed on the outer peripheral surface of the gear roll 145 (146). In addition, the number and arrangement of the smooth surfaces can be changed as appropriate.
  • the nonwoven fabric continuous sheet Sa from which a part of the stretchable fibers 2 has been cut by the second gear processing section 140 is pasted and joined to another sheet member Sb in the thickness direction by the sheet member pasting section 150 on the downstream side in the MD direction. (Bonding process).
  • the sheet member laminating unit 150 includes an adhesive application unit 151 and a pair of upper and lower laminating rolls 152.
  • the adhesive application unit 151 applies an adhesive such as a hot-melt adhesive to the surface of the conveyed nonwoven fabric continuous sheet Sa.
  • the laminating roll 152 is driven and rotated at a predetermined peripheral speed value V152 to convey the non-woven fabric continuous sheet Sa to the downstream side in the MD direction at the conveying speed of V152, and another sheet member Sb supplied separately to the non-woven fabric.
  • the continuous sheet Sa is bonded and bonded to the surface on which the adhesive is applied.
  • the peripheral speed value V152 of the laminating roll 152 is the same value as the peripheral speed value V132 of the downstream nip roll 132 of the stretching unit 130. That is, the nonwoven fabric continuous sheet Sa is conveyed downstream in the MD direction at a constant speed after being stretched in the stretching process. Thereby, the timing at the time of bonding other sheet
  • the stretchable nonwoven fabric 1 is manufactured by sequentially executing the above-described steps using the manufacturing apparatus 100.
  • FIG. 6 is an enlarged schematic view showing the state of the stretchable fiber 2 in the high shrinkage region HS.
  • FIG. 7 is an enlarged schematic view showing the state of the stretchable fiber 2 in the low shrinkage region LS.
  • the extensible fiber 1 is the state extended
  • FIG. 7 since the extensible fiber 1 itself hardly shrinks, there is a low possibility that the extensible fiber 1 in the stretched state affects the shrinkage of the stretchable fiber 2. Accordingly, in FIG. 6 and FIG. 7, the extensible fiber 1 is not shown for simplification of description.
  • the stretchable fibers 2 in an uncut state are bonded to each other at a plurality of locations, thereby forming a network structure as shown in FIG.
  • the stretchable fibers 2a and 2b have three crimping points WP along the longitudinal direction (MD direction) and are joined to each other at the crimping points.
  • compression-bonding point WP is formed by embossing etc. with respect to the nonwoven fabric continuous sheet Sa.
  • the contraction force generated as a whole of the low contraction region LS is relatively weak.
  • the stretchable fiber 2 is cut at a plurality of locations in the longitudinal direction, the contractile force is less likely to be transmitted in the longitudinal direction, so that the contractile force generated in the low contraction region LS tends to be weaker. That is, in the low shrinkage region LS, there are a plurality of cut end portions CE formed by cutting the stretchable fiber 2. And the contraction force in the said low contraction area
  • the cut end portion CE is easily formed in the low shrinkage region LS, whereas the cut end portion CE is hardly formed in the high shrinkage region HS. That is, the ratio of the cut end portion CE existing per unit volume of the low contraction region LS is higher than the ratio of the cut end portion CE existing per unit volume of the high contraction region HS. Thereby, the contraction force generated in the low contraction region LS is weaker than the contraction force generated in the high contraction region HS.
  • the stretchable nonwoven fabric 1 contains the stretchable fiber 1 and the stretchable fiber 2
  • the stretchable fiber 2 when measuring the number of the cut ends CE of the stretchable fiber 2, only the stretchable fiber 2 is dyed. Then, after making the cut end CE conspicuous, observation may be performed using a microscope or the like.
  • a dye for dyeing the stretchable fiber 2 for example, Katsuya Fine Goods Co., Ltd., Koji Daiall can be used.
  • the dye has a property that it is difficult to dye polypropylene (extensible fiber 1) while dyeing polyurethane (stretchable fiber 2). By dyeing only the stretchable fiber 2 using such a dye, the number of cut end portions CE of the stretchable fiber 2 can be efficiently measured as necessary.
  • the stretchable fiber 2 is longitudinally oriented (MD orientation).
  • MD orientation longitudinally oriented
  • the stretchable fibers 2c and 2d are arranged in a substantially straight line along the longitudinal direction (MD direction).
  • the stretchable fibers 2c and 2d cannot maintain the network structure as shown in FIG. 6, the contraction force does not act between the plurality of fibers. Therefore, as compared with the high shrinkage region HS in which the stretchable fibers 2 maintain a network structure, the shrinkage force generated in the low shrinkage region LS tends to be relatively weak.
  • the proportion of the crimping points WP existing per unit volume of the low shrinkage region LS is lower than the proportion of the crimping points WP present per unit volume of the high shrinkage region HS. ing. Thereby, the contraction force generated in the low contraction region LS is weaker than the contraction force generated in the high contraction region HS.
  • the magnitude of the contraction force actually generated in the high contraction region HS and the low contraction region LS will be described.
  • the magnitude of the “contraction force” can be represented by “return stress”.
  • the “return stress” is a value obtained by measuring the magnitude of a force (ie, contraction force) for returning to the original state when the sheet member to be measured is stretched under a predetermined condition.
  • the measurement of “return stress” in the present embodiment was performed using a low-speed extension type tensile tester (for example, SHIMADZU autograph AG-1, hereinafter also simply referred to as “tester”).
  • a low-speed extension type tensile tester for example, SHIMADZU autograph AG-1, hereinafter also simply referred to as “tester”.
  • the testing machine is provided with a pair of chuck portions (not shown) having a predetermined interval, and while holding the sample pieces with the pair of chuck portions, the sample pieces are pulled in the direction of increasing the interval between the chuck portions. Thus, the sample piece can be extended.
  • the sample piece collected from the stretchable nonwoven fabric 1 is gripped by the chuck portion of the testing machine so that the lengthwise interval is 50 mm.
  • the sample piece is pulled at a pulling speed of 100 mm / min until the interval between the chuck portions reaches 100 mm. That is, the sample piece is extended to twice the length.
  • the sample pieces are returned so that the interval between the chuck portions becomes 50 mm, and pulled to 100 mm again. And it returns until the space
  • the force with which the sample piece attempts to return is measured and recorded as a return stress (unit is expressed as N / 50 mm).
  • the size of the sample piece that can be collected is less than 70 mm ⁇ 50 mm, measurement is performed using a sample piece having a smaller size, and conversion is performed so that the width of the sample piece corresponds to 50 mm. Calculate the return stress.
  • the return stress measured in this way indicates that the larger the value, the stronger the contraction force.
  • the MD direction in the high shrinkage region HS was measured.
  • the average value of the return stress was 0.794 (N / 50 mm), and the average value of the return stress in the CD direction was 0.172 (N / 50 mm).
  • the average value of the MD direction return stress in the low shrinkage region LS was 0.437 (N / 50 mm), and the average value of the CD direction return stress was 0.071 (N / 50 mm).
  • the return stress in the high shrinkage region HS is larger than the return stress in the low shrinkage region LS. That is, it can be seen that in the MD direction (longitudinal direction) of the stretchable nonwoven fabric 1, the stretch force generated in the low shrinkage region LS is smaller than the stretch force generated in the high shrinkage region HS. Therefore, if the manufacturing apparatus 100 of this embodiment is used, it is possible to manufacture the stretchable nonwoven fabric 1 having a region having a high shrinkage force and a region having a low shrinkage force while having good stretchability.
  • FIG. 8 is a graph showing the relationship between the stretch ratio of the nonwoven fabric and the return stress in the MD direction.
  • the horizontal axis in FIG. 8 represents the stretching ratio of the stretchable nonwoven fabric 1 in the MD direction when stretched by gear stretching or the like, and the vertical axis represents the actually measured return stress in the MD direction.
  • the point A in FIG. 8 indicates a state where the stretchable nonwoven fabric 1 is not stretched (a state when the stretch ratio is 1.0), that is, a nonwoven fabric continuous sheet Sa before being stretched (a state of a raw fabric roll) Represents the magnitude of the return stress. At this time, the return stress in the MD direction is about 1 (N / 50 mm). Further, point B in FIG.
  • 8 indicates a return stress for the high shrinkage region HS formed by the stretchable nonwoven fabric 1 being stretched about 3.3 times, that is, by being stretched by the first gear processing portion 120. Represents the size of 8 is formed by the stretchable nonwoven fabric 1 being stretched by about 4.0 times, that is, stretched by the stretched portion 130 and stretched by the second gear worked portion 140.
  • region LS is represented.
  • the second gear processing unit 140 further performs gear stretching processing on a partial region (low shrinkage region LS) of the nonwoven fabric stretched by the stretching processing unit 130, thereby reducing the elastic limit in the nonwoven fabric. Since the number of stretchable fibers 2 that are cut exceeding the number increases, the shrinkage force in the region can be reduced. As a result, as shown in FIG. 8, the return stress value decreases as the draw ratio increases, and the return stress value can be lowered to 0.6 (N / 50 mm) or less.
  • the draw ratio of 3.7 when the return stress is 0.6 (N / 50 mm) is a value that can be realized by performing the gear drawing process by the second gear processing unit 140.
  • the MD / CD ratio indicates that the larger the value, the stronger the influence of the contractive force in the MD direction. That is, as the MD / CD ratio is larger, the fiber orientation of the stretchable fiber 2 is more likely to be closer to the MD direction.
  • FIG. 9 is a graph showing the relationship between the stretch ratio of the nonwoven fabric and the MD / CD ratio.
  • the horizontal axis in FIG. 9 represents the stretch ratio of the stretchable nonwoven fabric 1, and the vertical axis represents the MD-direction return stress actually measured.
  • the point A in FIG. 9 represents the magnitude of the return stress for the nonwoven fabric continuous sheet Sa (the state of the raw fabric roll) before being subjected to stretching.
  • the point B in FIG. 9 represents the magnitude of the return stress for the high shrinkage region HS, and the point C represents the magnitude of the return stress for the low shrinkage region LS.
  • the MD / CD ratio is about 3.0, whereas in the high shrinkage region HS (point B in FIG. 9), The MD / CD ratio is 4.62, and the MD / CD ratio is 6.15 in the low-shrinkage region LS (point C in FIG. 9). Contrary to the case of FIG. 8, the MD / CD ratio increases with an increase in the draw ratio, and the MD / CD ratio in the low shrinkage region LS becomes larger than the MD / CD ratio in the high shrinkage region HS.
  • the second gear processing unit 140 further applies a gear stretching process to a partial region (low shrinkage region LS) of the non-woven fabric stretched by the stretching unit 130, so that the fibers in the low shrinkage region LS It is considered that the fiber orientation of the stretchable fiber 2 tends to be close to the MD direction.
  • the MD / CD ratio in the contraction region LS shows a high value of 5.3 or more.
  • the draw ratio of 3.7 times when the MD / CD ratio is 5.3 is a value that can be realized by performing the gear drawing process by the second gear processing unit 140.
  • the range of strain generated when the stretchable fiber 2 contracts in the low shrinkage region LS of the stretchable nonwoven fabric 1 is larger than the range of strain generated when the stretchable fiber 2 contracts in the high shrinkage region HS.
  • the sample piece collected from the low contraction region LS has a strain of 15 to 20%. This is because the network structure of the stretchable fibers 2 is not maintained in the low shrinkage region LS, and the fiber orientation of the stretchable fibers 2 is closer to the MD direction (see FIG. 7).
  • FIG. 10 is a schematic perspective view of the disposable diaper 5.
  • FIG. 11 is a schematic plan view of the disposable diaper 5 in the unfolded state.
  • the disposable diaper 5 (hereinafter also simply referred to as “diaper 5”) includes an absorbent main body 51 (first component) that is applied to the crotch portion of the wearer and absorbs excrement such as urine, and the ventral side portion of the wearer. It is a so-called three-piece type disposable diaper constituted by three parts, a ventral band member 52 (second part) that covers the back and a back side band member 53 (third part) that covers the back side of the wearer.
  • the absorbent main body 51 is fixed between the ventral band member 52 and the dorsal band member 53 arranged substantially in parallel, and the external shape is substantially H in plan view. It has a shape.
  • the absorbent main body 51 When the diaper 5 is worn, the absorbent main body 51 is folded in half at the center in the longitudinal direction, and the abdominal belt member 52 and the back belt member 53 facing each other are joined to each other at the widthwise short edges 52e and 53e.
  • the diaper 5 in the wearing state is formed with the waist opening 5HB and the pair of leg openings 5HL as shown in FIG.
  • an elastic nonwoven fabric may be used as a material for the ventral band member 52 and the dorsal band member 53 so that the ventral band member 52 and the dorsal band member 53 can expand and contract in the width direction of the diaper 5.
  • FIG.11 and FIG.10 shows, when the abdominal side band member 52 shrink
  • the absorbent main body 51 contracts, the area of the region covering the wearer's skin is reduced by the contraction.
  • the ventral belt member 52 it is necessary to adjust the strength of the contraction force to suppress the absorbent main body 51 from contracting inward in the width direction.
  • the stretchable nonwoven fabric 1 of this embodiment is used as the ventral belt member 52 of the diaper 5.
  • the stretchable nonwoven fabric 1 is disposed on the belly side of the diaper 5 so that the longitudinal direction of the stretchable nonwoven fabric 1 is aligned with the width direction of the diaper 5.
  • the stretchable nonwoven fabric 1 has a high shrinkage region HS and a low shrinkage region LS, while having stretchability, so that the shrinkage force can be weakened as a whole.
  • the stretchable nonwoven fabric 1 as the ventral belt member 52 and arranging the low shrinkage region LS and the absorbent main body 51 so as to overlap each other, the absorbent main body 51 is effectively contracted inward in the width direction. Can be suppressed.
  • the stretchable nonwoven fabric 1 can adjust the strength of shrinkage by changing the range in which the high shrinkage region HS and the low shrinkage region LS are formed. Thereby, a comfortable fit can be given to the wearer by imparting appropriate stretchability to the waist opening 5HB of the diaper 5 while suppressing the shrinkage of the absorbent main body 51.
  • the low-shrinkage region LS is disposed in a region that is not desired to be shrunk with respect to other parts, the product can be configured so that the region that does not want to shrink is not shrunk while having elasticity as a whole.
  • FIG. 12 is a diagram illustrating the configuration of the manufacturing apparatus 200 that manufactures the stretchable nonwoven fabric 1.
  • the manufacturing apparatus 200 includes a transport mechanism CV, a heating unit 210, a first gear processing unit 220, a second gear processing unit 240, and a sheet member bonding unit 250.
  • the structure of the 2nd gear process part 240 differs compared with the manufacturing apparatus 100 of 1st Embodiment. Further, the manufacturing apparatus 200 is not provided with the stretching unit 130. Other basic configurations and functions are substantially the same as those of the manufacturing apparatus 100, and thus description thereof is omitted here. Hereinafter, the 2nd gear process part 240 is demonstrated.
  • the 2nd gear process part 240 of the manufacturing apparatus 200 is a mechanism which performs the process corresponded to the extending
  • the second gear machining unit 240 includes a drive roll 241, a press roll 242, and a pair of gear rolls 245 and 246 (second gear roll).
  • the drive roll 241 is a pair of upper and lower rollers capable of adjusting the peripheral speed value, and is driven and rotated at a predetermined peripheral speed value V241 while sandwiching the nonwoven fabric continuous sheet Sa between the outer peripheral surfaces of the nonwoven fabric continuous sheet. Sa is transported downstream in the MD direction at a transport speed of V241.
  • size of the conveyance speed V241 is more than the conveyance speed V221 of the nonwoven fabric continuous sheet Sa by the 1st gear process part 220, for example, the magnitude
  • the nonwoven fabric continuous sheet Sa is slightly extended in the MD direction between the first gear processing unit 220 and the drive roll 241.
  • the nonwoven fabric continuous sheet Sa expresses stretchability in the MD direction in the first processing step in the first gear processing section 220, there is a risk that the web will be distorted during conveyance.
  • the nonwoven fabric continuous sheet Sa is conveyed in the state stretched in MD direction by adjusting the conveyance speed by the drive roll 241 and applying the tension in the MD direction to the nonwoven fabric continuous sheet Sa. It is possible to suppress the occurrence of kinking during the transport of.
  • the magnitude of the conveyance speed V241 is not limited to the above, and may be equal to V221 or may be greater than 115% of V221.
  • the conveyance speed V131 in the upstream nip roll 131 of the first embodiment may be equal to or higher than the conveyance speed V121 in the first gear machining unit 120.
  • the press roll 242 is provided downstream of the drive roll 241 in the MD direction, and rotates while pressing the nonwoven fabric continuous sheet Sa against the outer peripheral surface of the gear roll 246 described later.
  • the gear roll 246 rotates at a predetermined peripheral speed value V242, and the nonwoven fabric continuous sheet Sa is conveyed downstream in the MD direction at a conveyance speed of V242 while being sandwiched between the rolls 242.
  • the conveyance speed V242 in the press roll 242 is faster than the conveyance speed V241 in the drive roll 241 and is adjusted to be about 255% of the conveyance speed V221 by the first gear processing unit 220 in this embodiment.
  • the nonwoven fabric continuous sheet Sa is stretched in the MD direction based on the peripheral speed difference between the transport speed V241 by the drive roll 241 and the transport speed V242 by the press roll 242 (stretching process), and the stretchable fiber 2 undergoes plastic deformation. It is in a state where it has been stretched to such an extent that it does not occur (not to break).
  • the manufacturing apparatus 200 can be comprised compactly. Moreover, when a conveyance distance becomes short, it is suppressed that the nonwoven fabric continuous sheet Sa is extended too much in MD direction, and nonwoven fabric continuous sheet Sa becomes difficult to shrink
  • the width W242 of the press roll 242 in the CD direction is wider than the width WSa of the nonwoven fabric continuous sheet Sa in the CD direction (W242> WSa, see FIG. 17 described later).
  • the outer peripheral surface of the press roll 242 is formed of a non-slip material such as silicone rubber, and the second gear roll 246 has a constant force in the direction of the central axis in the radial direction (that is, in the direction perpendicular to the tangential direction of the outer peripheral surface). Pressed. Thereby, it can convey, without pressing the full width of the nonwoven fabric continuous sheet Sa, without sliding on the outer peripheral surface of the 2nd gear roll 246, and can extend the nonwoven fabric continuous sheet Sa correctly.
  • the pair of gear rolls 245 and 246 are a pair of upper and lower roll mechanisms that rotate around a rotation axis along the CD direction with their outer peripheral surfaces facing each other.
  • FIG. 13 is a schematic diagram illustrating the configuration of the gear roll 245.
  • FIG. 14 is a schematic diagram illustrating the configuration of the gear roll 246.
  • FIG. 15 is a diagram illustrating a region X in FIG.
  • FIG. 16 is a diagram illustrating a region Y in FIG.
  • the one side gear roll 245 is a tooth surface that is a region in which a plurality of teeth are formed so as to protrude outwardly from the outer peripheral surface, similar to the gear roll 145 of the first embodiment.
  • 245ts and smooth surfaces 245fs which are regions where teeth are not formed are alternately arranged.
  • the width W245 in the CD direction of the gear roll 245 is wider than the width WSa in the CD direction of the nonwoven fabric continuous sheet Sa (W245> WSa).
  • the tooth surface 245ts is alternately formed with ridges 245m and valleys 245v along the rotation direction.
  • the plurality of teeth (crest portion 245m and trough portion 245v) of the gear roll 245 are continuously formed along the CD direction, and the width W245m of the crest portion 245m (valley portion 245v) in the CD direction is the nonwoven fabric continuous sheet Sa. Is narrower than the width WSa in the CD direction (WSa> W245m). Further, the thickness t245m (the width in the MD direction of the tip portion of the peak portion 245m) of the tooth tip portion of the gear roll 245 is about 0.2 mm.
  • the gear roll 245 can heat the tooth surface 245ts to a predetermined temperature (for example, about 120 ° C.) by a heating device such as a heater. The reason for heating the teeth of the gear roll 245 will be described later.
  • the other gear roll 246 includes a tooth surface 246ts, which is a region where a plurality of teeth are formed so as to be recessed outside the outer peripheral surface, and a region where no teeth are formed.
  • the smooth surfaces 246 fs are alternately arranged.
  • the state where the teeth formed on the tooth surface 246ts are recessed outside the outer peripheral surface means that the bottom of the tooth valley 246v is inside the outer peripheral surface of the gear roll 246 as shown in FIG. This is a state in which the tip of the tooth crest 246m is formed at the same position as the outer peripheral surface of the gear roll 246.
  • the distance from the center of the gear roll 246 to the bottom of the tooth valley 246v is smaller than the radius of the gear roll 246, and the distance from the center of the gear roll 246 to the tip of the tooth peak 246m is substantially equal to the radius of the gear roll 246. .
  • the tooth surface 245ts of the gear roll 245 and the tooth surface 246ts of the gear roll 246 are formed at an equal pitch Pm and arranged at positions facing each other.
  • the nonwoven fabric continuous sheet Sa passes between the surfaces 246ts along the MD direction.
  • the non-woven fabric continuous sheet Sa is deformed and stretched in a three-point bend shape as described with reference to FIG. 4 in the portion that has passed between the tooth surfaces 245ts and 246ts (second processing step). That is, the stretchable fibers 2 that have been stretched to near the elastic limit are further stretched, whereby at least some of the stretchable fibers 2 of the plurality of stretchable fibers 2 constituting the nonwoven fabric continuous sheet Sa are cut,
  • the low-shrinkage region LS in FIG. 1 is formed by removing the pressure-bonding point where the elastic fibers 2 are pressure-bonded.
  • the gear roll 246 has a function of conveying the nonwoven fabric continuous sheet Sa in the MD direction. That is, as shown in FIG. 12, the nonwoven fabric continuous sheet Sa is wound around a part of the outer peripheral surface of the gear roll 246 and rotated to convey the nonwoven fabric continuous sheet Sa in the rotation direction. Therefore, the teeth of the gear roll 246 in the second embodiment are recessed outside the outer peripheral surface, and the tip portion of the peak portion 246m of the teeth is configured not to protrude outward from the outer peripheral surface of the gear roll 246. . With such a configuration, the nonwoven fabric continuous sheet Sa wound around the outer peripheral surface can be smoothly conveyed.
  • the nonwoven fabric continuous sheet Sa can be sandwiched between the press roll 242 and sufficiently stretched. If the nonwoven fabric continuous sheet Sa is sandwiched and conveyed between the press roll 242 and the gear roll 245 having convex teeth on the outside of the outer peripheral surface, the outer peripheral surface of the gear roll 245 is rotated when the press roll 242 rotates. The state which contacts only with the front-end
  • the behavior of the press roll 242 bouncing between the teeth of the tooth surface 246ts of the gear roll 245 (between two adjacent ridges 245m) is exhibited, and the nonwoven fabric continuous sheet Sa becomes slippery.
  • the nonwoven fabric continuous sheet Sa is sandwiched and conveyed between the press roll 242 and the gear roll 246 having concave teeth on the outside of the outer peripheral surface, the outer peripheral surface of the press roll 242 becomes the teeth (mountains) of the gear roll 246. The state where only the tip of the portion 246m) is in contact does not occur.
  • the nonwoven fabric continuous sheet Sa becomes less slippery and is stretched while stably transporting the nonwoven fabric continuous sheet Sa in the MD direction. can do.
  • the contact position (a pair of drive roll 241 is nonwoven fabric continuous sheet Sa) in the drive roll 241.
  • the height of the contact position of the nonwoven fabric continuous sheet Sa on the gear roll 246 (position where the gear roll 245 and the gear roll 246 sandwich the nonwoven fabric continuous sheet Sa) is shifted.
  • each roll is arrange
  • FIG. 17 is a schematic diagram for explaining the relationship of the width in the CD direction of the second gear machining section 240.
  • the width W246 of the gear roll 246 in the CD direction is wider than the width WSa of the nonwoven fabric continuous sheet Sa in the CD direction (W246> WSa), and is approximately the same size as the width W245 of the gear roll 245 in the CD direction.
  • the peak portion 246m and the valley portion 246v are formed continuously along the CD direction, the width W246m of the peak portion 246m of the gear roll 246 in the CD direction is narrower than the width WSa of the nonwoven fabric continuous sheet Sa in the CD direction, and The crest 245m of the gear roll 245 is wider than the width W245m in the CD direction (WSa> W246m> W245m).
  • WSa> W246m both ends in the CD direction of the nonwoven fabric continuous sheet Sa (shaded portions in FIG.
  • the thickness t246m (the width in the MD direction of the tip portion of the peak portion 246m) of the tooth tip of the gear roll 246 is about 0.5 mm. That is, the thickness t246m of the tooth tip of the gear roll 246 is thicker than the thickness t245m (0.2 mm) of the tooth tip of the gear roll 245 (t246m> t245m). This is to prevent the outer peripheral surface of the press roll 242 from being damaged when the press roll 242 is pressed against the outer peripheral surface of the gear roll 246.
  • the gear roll 246 is formed of silicone rubber or the like if the tip of the tooth is thin (that is, the teeth are sharp).
  • the traces of the teeth are likely to be attached to the outer peripheral surface of the pressed roll 242 and the conveyance accuracy may gradually deteriorate. Therefore, the outer peripheral surface of the press roll 242 is made thicker than the tip end of the tooth of the gear roll 245 that is not in contact with the press roll 242, by making the tip end of the tooth of the gear roll 246 that is in contact with the press roll 242.
  • the teeth are hard to be marked.
  • the manufacturing apparatus 100 first embodiment
  • the manufacturing apparatus 200 second embodiment
  • the manufacturing apparatus 100 extends the nonwoven fabric continuous sheet Sa to cut a part of the stretchable fibers 2 or remove the crimp points.
  • the low-shrinkage region LS of FIG. 1 is formed by cutting a part of the stretchable fiber 2 out of the stretchable fiber 2 and the stretchable fiber 3 constituting the nonwoven fabric continuous sheet Sa. .
  • the nonwoven fabric continuous sheet Sa is stretched (second processing step) while at least one of the pair of gear rolls 145 and 146 of the second gear processing unit 140 is heated to a predetermined temperature.
  • heating is performed so that the temperature of at least one of the tooth surface 145ts of the gear roll 145 and the tooth surface 146ts of the gear roll 146 is higher than normal temperature and lower than the melting point of the extensible fiber 3. Heating may be performed by a heater provided outside, or may be performed by a heater provided on the gear rolls 145 and 146 itself.
  • the stretchable fiber 2 is a thermoplastic elastomer (for example, TPU: thermoplastic polyurethane) fiber as described above, it has lower heat resistance than the extensible fiber 3 and may be distorted when heated. It becomes easy to be cut due to deterioration. Thereby, it becomes possible to efficiently cut some stretchable fibers 2 without cutting the extensible fibers 3 in the second gear processed portion 140. Moreover, it can suppress that nonwoven fabric continuous sheet Sa itself is cut
  • TPU thermoplastic polyurethane
  • the temperature at which the gear rolls 145 and 146 are heated is preferably as high as possible among the temperatures lower than the melting point (about 200 ° C.) of the extensible fiber 3.
  • the gear roll up to about 120 ° C. Is heating up.
  • the gear roll 245 having teeth protruding outward from the outer peripheral surface is heated to a predetermined temperature.
  • the nonwoven fabric continuous sheet Sa is stretched (second processing step).
  • the heating method and heating temperature conditions for the gear roll 245 are the same as in the first embodiment. Thereby, the extensible fiber 3 constituting the nonwoven fabric continuous sheet Sa is easily stretched and is not easily cut, and at least a part of the stretchable fiber 2 is easily cut.
  • the 2nd gear process part 240 of 2nd Embodiment it conveys, winding the nonwoven fabric continuous sheet Sa around a part of outer peripheral surface of the gear roll 246 which has the tooth
  • the gear roll 246 is heated, the contact area between the peripheral surface of the gear roll 246 and the nonwoven fabric continuous sheet Sa is large, so that the entire nonwoven fabric continuous sheet Sa is easily heated, and the stretchable fiber 2 is excessively distorted. Problems such as becoming larger are likely to occur. Therefore, in the second embodiment, only the gear roll 245 side of the pair of gear rolls 245 and 246 is heated, and the gear roll 246 is not heated.
  • the teeth of the gear rolls 145 and 146 (first embodiment) and the gear rolls 245 and 246 (second embodiment) used in the second processing step are each continuously formed in the CD direction. That is, the peak portions 145m, 146m, 245m, and 246m of each tooth are formed to have a predetermined width in the CD direction. Since the teeth of each gear roll are continuously formed in the CD direction, the stretchable fibers 2 can be efficiently stretched over a wide range in the CD direction (width direction) of the nonwoven fabric continuous sheet Sa (see FIG. 17). ).
  • FIG. 18 is a diagram for explaining stretching of the stretchable fiber 2 performed in the second processing step.
  • FIG. 18 schematically shows an enlarged view of a state in which the plurality of stretchable fibers 2c to 2g constituting the nonwoven fabric continuous sheet Sa are crimped while being intertwined with each other.
  • the stretchable fiber 2c and the stretchable fiber 2d are crimped to each other at a crimping point WP1.
  • the stretchable fibers 2d and 2e are crimped to each other by the crimping point WP2
  • the stretchable fibers 2e and 2f are crimped to each other by the crimping point WP2
  • the stretchable fibers 2f and 2g are crimped to each other by the crimping point WP4.
  • the elastic fiber 2 which comprises the nonwoven fabric continuous sheet Sa is a long fiber, and at least one part is arrange
  • such long fibers are crimped
  • the stretchable fibers 2c and 2d are in the MD direction.
  • the stretchable fibers 2e and 2f are not stretched.
  • the teeth of the gear roll (mountain portion 145m1 and peak portion 145m2) are arranged in parallel to the CD direction.
  • the nonwoven fabric continuous sheet Sa is arranged in a direction perpendicular to the conveyance direction (MD direction). If it is such arrangement
  • the stretchable fibers 2c to 2g in FIG. 18 are stretched in the MD direction with a uniform force in the same region in the MD direction (the region between the peak portions 145m1 and 145m2). Distortion is less likely to occur.
  • the gear roll teeth do not necessarily have to be arranged in a direction parallel to the CD direction. For example, the gear roll teeth can be stretched even if they are arranged at an angle with respect to the CD direction. It is.
  • the interval (pitch) in the MD direction of two teeth arranged adjacent to each other in the MD direction in each gear roll is wider than the pitch in the MD direction of the crimping point WP for crimping the stretchable fibers 2 to each other.
  • the pitch Pm the distance in the MD direction
  • the peak part 145m1 and the peak part 145m2 is wider than the shortest distance Pwp in the MD direction between the crimping point WP1 and the crimping point WP2 (P1).
  • the stretchable fiber between the two teeth is not included.
  • the gap in the MD direction of the teeth of the gear roll is set to be wider than the pitch in the MD direction of the crimping points WP for crimping the stretchable fibers 2 to each other.
  • the crimping point WP is formed by embossing the nonwoven fabric continuous sheet Sa, the size of the shortest distance Pwp in the MD direction of the crimping point WP and the teeth of the second gear roll. It is possible to adjust the size of the pitch Pm.
  • the pair of gear rolls provided in the first gear processing unit 120 and the second gear processing unit 140 has been described with reference to FIG. 4 and FIG. That is not the case.
  • a convex portion is formed on the outer peripheral surface of one gear roll
  • a groove portion (concave portion) corresponding to the convex portion is formed on the outer peripheral surface of the other gear roll.
  • the structure may be such that the non-woven fabric sheet passing between the portions and the groove portions are stretched by meshing with each other.
  • the three-piece type diaper 5 has been described as an example of using the stretchable nonwoven fabric 1, but the use example of the stretchable nonwoven fabric 1 is not limited thereto.
  • the stretchable nonwoven fabric 1 can be used for all absorbent articles using nonwoven fabric such as pants-type disposable diapers, napkins, and cage sheets.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Abstract

La présente invention concerne un procédé de fabrication de tissu non tissé élastique qui comprend : une étape de transport pour transporter, dans une direction de transport, un tissu non tissé qui contient des fibres élastiques qui sont élastiques, et des fibres extensibles qui sont moins élastiques que les fibres élastiques ; une première étape de traitement dans laquelle le tissu non tissé est étendu en passant à travers une paire de premiers rouleaux à engrenage et dans laquelle au moins certaines des fibres extensibles sont étirées ; une étape d'étirement dans laquelle, après la première étape de traitement, le tissu non tissé est étiré dans la direction de transport ; et une seconde étape de traitement dans laquelle, après l'étape d'étirage, le tissu non tissé est étiré en passant à travers une paire de seconds rouleaux à engrenage qui comprennent une zone où des dents sont formées sur la surface périphérique et une zone où aucune dent n'est formée, et au moins certaines des fibres élastiques sont coupées.
PCT/JP2015/085667 2014-12-26 2015-12-21 Procédé de fabrication de tissu non tissé élastique Ceased WO2016104422A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201580070959.5A CN107109734B (zh) 2014-12-26 2015-12-21 伸缩性无纺布的制造方法

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2014-265424 2014-12-26
JP2014265424 2014-12-26
JP2015-248236 2015-12-21
JP2015248236A JP6357462B2 (ja) 2014-12-26 2015-12-21 伸縮性不織布の製造方法

Publications (1)

Publication Number Publication Date
WO2016104422A1 true WO2016104422A1 (fr) 2016-06-30

Family

ID=56150441

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/085667 Ceased WO2016104422A1 (fr) 2014-12-26 2015-12-21 Procédé de fabrication de tissu non tissé élastique

Country Status (1)

Country Link
WO (1) WO2016104422A1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10966873B2 (en) 2016-12-20 2021-04-06 The Procter & Gamble Company Methods and apparatuses for making elastomeric laminates with elastic strands unwound from spools on surface unwinders
US11129753B2 (en) 2017-09-01 2021-09-28 The Procter & Gamble Company Methods and apparatuses for making elastomeric laminates
US11147718B2 (en) 2017-09-01 2021-10-19 The Procter & Gamble Company Beamed elastomeric laminate structure, fit, and texture
CN113737508A (zh) * 2021-08-30 2021-12-03 黄山富田精工智造股份有限公司 一种切断位于无纺布夹层中氨纶丝的方法及其结构
US11547613B2 (en) 2017-12-05 2023-01-10 The Procter & Gamble Company Stretch laminate with beamed elastics and formed nonwoven layer
CN115605108A (zh) * 2020-04-30 2023-01-13 株式会社瑞光（Jp） 口罩用耳挂构件的制造方法以及口罩用耳挂构件制造装置
US11819393B2 (en) 2019-06-19 2023-11-21 The Procter & Gamble Company Absorbent article with function-formed topsheet, and method for manufacturing
US11925537B2 (en) 2017-09-01 2024-03-12 The Procter & Gamble Company Beamed elastomeric laminate structure, fit, and texture
US11969325B2 (en) 2018-01-25 2024-04-30 The Procter & Gamble Company Absorbent article with function-formed topsheet, and method for manufacturing
US12053357B2 (en) 2019-06-19 2024-08-06 The Procter & Gamble Company Absorbent article with function-formed topsheet, and method for manufacturing
US12268579B2 (en) 2020-03-13 2025-04-08 The Procter & Gamble Company Beamed elastomeric laminate performance and zones
US12508173B2 (en) 2018-01-25 2025-12-30 The Procter & Gamble Company Topsheets for absorbent articles

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002273808A (ja) * 2001-03-16 2002-09-25 Daio Paper Corp 伸縮性シートの製造方法およびこれを用いた紙おむつ
WO2006115259A1 (fr) * 2005-04-25 2006-11-02 Kao Corporation Feuille extensible et procédé de fabrication idoine
JP2008061691A (ja) * 2006-09-05 2008-03-21 Kao Corp 伸縮性シートの製造方法
JP2008061692A (ja) * 2006-09-05 2008-03-21 Kao Corp 伸縮性シートの製造方法
JP2011505178A (ja) * 2007-11-19 2011-02-24 ザ プロクター アンド ギャンブル カンパニー ウェブを活性化するための装置
WO2011065264A1 (fr) * 2009-11-27 2011-06-03 ユニ・チャーム株式会社 Procédé de fabrication d'une feuille composite et dispositif de fabrication
JP2012077401A (ja) * 2010-09-30 2012-04-19 Uni Charm Corp 不織布、及び上記不織布を含む吸収性物品、並びに上記不織布の形成方法
JP2013208386A (ja) * 2012-03-30 2013-10-10 Unicharm Corp 吸収性物品

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002273808A (ja) * 2001-03-16 2002-09-25 Daio Paper Corp 伸縮性シートの製造方法およびこれを用いた紙おむつ
WO2006115259A1 (fr) * 2005-04-25 2006-11-02 Kao Corporation Feuille extensible et procédé de fabrication idoine
JP2008061691A (ja) * 2006-09-05 2008-03-21 Kao Corp 伸縮性シートの製造方法
JP2008061692A (ja) * 2006-09-05 2008-03-21 Kao Corp 伸縮性シートの製造方法
JP2011505178A (ja) * 2007-11-19 2011-02-24 ザ プロクター アンド ギャンブル カンパニー ウェブを活性化するための装置
WO2011065264A1 (fr) * 2009-11-27 2011-06-03 ユニ・チャーム株式会社 Procédé de fabrication d'une feuille composite et dispositif de fabrication
JP2012077401A (ja) * 2010-09-30 2012-04-19 Uni Charm Corp 不織布、及び上記不織布を含む吸収性物品、並びに上記不織布の形成方法
JP2013208386A (ja) * 2012-03-30 2013-10-10 Unicharm Corp 吸収性物品

Cited By (49)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11737928B2 (en) 2016-12-20 2023-08-29 The Procter & Gamble Company Laminate(s) comprising beamed elastics and absorbent article(s) comprising said laminate(s)
US12478512B2 (en) 2016-12-20 2025-11-25 The Procter & Gamble Company Methods and apparatuses for making elastomeric laminates with elastic strands unwound from spools on surface unwinders
US10973699B2 (en) 2016-12-20 2021-04-13 The Procter & Gamble Company Methods and apparatuses for making elastomeric laminates with elastic strands unwound from beams
US10987253B2 (en) 2016-12-20 2021-04-27 The Procter & Gamble Company Beamed elastic laminate properties
US10993851B2 (en) 2016-12-20 2021-05-04 The Procter & Gamble Company Hip-to-waist and waist-to-crotch silhouette(s) of absorbent article(s) comprising beamed elastics
US11000421B2 (en) 2016-12-20 2021-05-11 The Procter & Gamble Company Length-to-waist silhouette(s) of absorbent article(s) comprising beamed elastics
US11000420B2 (en) 2016-12-20 2021-05-11 The Procter & Gamble Company Laminate(s) comprising beamed elastics and absorbent article(s) comprising said laminate(s)
US11000426B2 (en) 2016-12-20 2021-05-11 The Procter & Gamble Company Disposable absorbent articles having cuffs of improved stretch laminate structure
US12059329B2 (en) 2016-12-20 2024-08-13 The Procter & Gamble Company Methods and apparatuses for making elastomeric laminates with elastic strands provided with a spin finish
US11141322B2 (en) 2016-12-20 2021-10-12 The Procter & Gamble Company Methods and apparatuses for making elastomeric laminates
US11141321B2 (en) 2016-12-20 2021-10-12 The Procter & Gamble Company Methods and apparatuses for making elastomeric laminates with elastic strands provided with a spin finish
US12064323B2 (en) 2016-12-20 2024-08-20 The Procter & Gamble Company Disposable absorbent articles having cuffs of improved stretch laminate structure
US11147717B2 (en) 2016-12-20 2021-10-19 The Procter & Gamble Company Methods and apparatuses for making elastomeric laminates with elastic strands
US12036099B2 (en) 2016-12-20 2024-07-16 The Procter & Gamble Company Methods and apparatuses for making elastomeric laminates with elastic strands unwound from spools on surface unwinders
US11219555B2 (en) 2016-12-20 2022-01-11 The Procter & Gamble Company Apparatuses and methods for making absorbent articles with elastomeric laminates
US11318052B2 (en) 2016-12-20 2022-05-03 The Procter & Gamble Company Methods and apparatuses for making elastomeric laminates with elastic strands unwound from beams
US11344453B2 (en) 2016-12-20 2022-05-31 The Procter & Gamble Company Methods and apparatuses for making elastomeric laminates with elastic strands unwound from spools on surface unwinders
US12059328B2 (en) 2016-12-20 2024-08-13 The Procter & Gamble Company Methods and apparatuses for making elastomeric laminates
US11737927B2 (en) 2016-12-20 2023-08-29 The Procter & Gamble Company Laminate(s) comprising beamed elastics and absorbent article(s) comprising said laminate(s)
US12016753B2 (en) 2016-12-20 2024-06-25 The Procter & Gamble Company Absorbent article(s) chassis comprising beamed elastics
US11642249B2 (en) 2016-12-20 2023-05-09 The Procter & Gamble Company Methods and apparatuses for making elastomeric laminates with elastic strands provided with a spin finish
US11654059B2 (en) 2016-12-20 2023-05-23 The Procter & Gamble Company Methods and apparatuses for making elastomeric laminates
US11654060B2 (en) 2016-12-20 2023-05-23 The Procter & Gamble Company Methods and apparatuses for making elastomeric laminates with elastic strands provided with a spin finish
US11660235B2 (en) 2016-12-20 2023-05-30 The Procter & Gamble Company Methods and apparatuses for making elastomeric laminates with elastic strands
US10966874B2 (en) 2016-12-20 2021-04-06 The Procter & Gamble Company Absorbent article(s) chassis comprising beamed elastics
US12115043B2 (en) 2016-12-20 2024-10-15 The Procter & Gamble Company Length-to-waist silhouette(s) of absorbent article(s) comprising beamed elastics
US10966873B2 (en) 2016-12-20 2021-04-06 The Procter & Gamble Company Methods and apparatuses for making elastomeric laminates with elastic strands unwound from spools on surface unwinders
US12109093B2 (en) 2016-12-20 2024-10-08 The Procter & Gamble Company Beamed elastic laminate properties
US12109094B2 (en) 2016-12-20 2024-10-08 The Procter & Gamble Company Hip-to-waist and waist-to-crotch silhouette(s) of absorbent article(s) comprising beamed elastics
US11944523B2 (en) 2016-12-20 2024-04-02 The Procter & Gamble Company Elastomeric laminate(s) for absorbent article donning
US11944524B2 (en) 2017-09-01 2024-04-02 The Procter & Gamble Company Methods and apparatuses for making elastomeric laminates
US11925537B2 (en) 2017-09-01 2024-03-12 The Procter & Gamble Company Beamed elastomeric laminate structure, fit, and texture
US11607348B2 (en) 2017-09-01 2023-03-21 The Procter & Gamble Company Methods and apparatuses for making elastomeric laminates
US12599506B2 (en) 2017-09-01 2026-04-14 The Procter & Gamble Company Method for making elastomeric laminates
US11147718B2 (en) 2017-09-01 2021-10-19 The Procter & Gamble Company Beamed elastomeric laminate structure, fit, and texture
US11129753B2 (en) 2017-09-01 2021-09-28 The Procter & Gamble Company Methods and apparatuses for making elastomeric laminates
US12161539B2 (en) 2017-12-05 2024-12-10 The Procter & Gamble Company Stretch laminate with beamed elastics and formed nonwoven layer
US12303366B2 (en) 2017-12-05 2025-05-20 The Procter & Gamble Company Stretch laminate with beamed elastics and formed nonwoven layer
US11547613B2 (en) 2017-12-05 2023-01-10 The Procter & Gamble Company Stretch laminate with beamed elastics and formed nonwoven layer
US11969325B2 (en) 2018-01-25 2024-04-30 The Procter & Gamble Company Absorbent article with function-formed topsheet, and method for manufacturing
US12357514B2 (en) 2018-01-25 2025-07-15 The Procter & Gamble Company Absorbent article with function-formed topsheet, and method for manufacturing
US12508173B2 (en) 2018-01-25 2025-12-30 The Procter & Gamble Company Topsheets for absorbent articles
US12053357B2 (en) 2019-06-19 2024-08-06 The Procter & Gamble Company Absorbent article with function-formed topsheet, and method for manufacturing
US11819393B2 (en) 2019-06-19 2023-11-21 The Procter & Gamble Company Absorbent article with function-formed topsheet, and method for manufacturing
US12324732B2 (en) 2019-06-19 2025-06-10 The Procter & Gamble Company Absorbent article with function-formed topsheet, and method for manufacturing
US12268579B2 (en) 2020-03-13 2025-04-08 The Procter & Gamble Company Beamed elastomeric laminate performance and zones
EP4144417A4 (fr) * 2020-04-30 2023-09-20 Zuiko Corporation Procédé de production d'éléments d'attache derrière les oreilles pour masque et appareil de production d'éléments d'attache derrière les oreilles pour masque
CN115605108A (zh) * 2020-04-30 2023-01-13 株式会社瑞光（Jp） 口罩用耳挂构件的制造方法以及口罩用耳挂构件制造装置
CN113737508A (zh) * 2021-08-30 2021-12-03 黄山富田精工智造股份有限公司 一种切断位于无纺布夹层中氨纶丝的方法及其结构

Similar Documents

Publication Publication Date Title
JP6446264B2 (ja) 伸縮性不織布の製造方法、及び、吸収性物品の製造方法
WO2016104422A1 (fr) Procédé de fabrication de tissu non tissé élastique
TWI441966B (zh) A stretchable nonwoven fabric, a composite sheet provided with the nonwoven fabric, an absorbent article having the composite sheet, and a method of manufacturing the stretchable nonwoven fabric
KR101445092B1 (ko) 착용 물품의 제조방법
JP6357462B2 (ja) 伸縮性不織布の製造方法
EP2095939B1 (fr) Feuille composite et article absorbant comprenant ladite feuille
KR100239274B1 (ko) 무변형 연신 적층 웨브를 연속적으로 연신하는 방법 및 장치
CN101310066B (zh) 片材的加工装置及片材的制造方法
JP2002253605A (ja) 複合伸縮部材の製造方法
JP5186386B2 (ja) 複合シート及び複合シートを用いた吸収性物品
CN111405887A (zh) 短裤型吸收性物品
WO2011065264A1 (fr) Procédé de fabrication d'une feuille composite et dispositif de fabrication
JP4979419B2 (ja) パンツ型吸収性物品の製造方法
JP5337688B2 (ja) 使い捨ておむつの製造方法
EP2522487A1 (fr) Dispositif d'étirage et procédé de fabrication d'un article absorbant
JP7037990B2 (ja) 伸縮シート
CN117897126B (zh) 伸缩性片、内裤型吸收性物品以及伸缩性片的制造方法
JP5655116B2 (ja) 伸縮性不織布
JP6864502B2 (ja) 伸縮性シートの製造方法
JP6549206B2 (ja) 吸収性物品の製造方法及び吸収性物品の製造装置
JP5426340B2 (ja) 着用物品の製造方法
CN104869961A (zh) 伸缩性片的制造方法和伸缩性片的制造装置
JP2008012742A (ja) 複合シートの製造方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15872990

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15872990

Country of ref document: EP

Kind code of ref document: A1