JP2017014657A - Method for producing nonwoven fabric for liquid-permeable surface sheet of absorbent article - Google Patents

Abstract

The present invention provides a method for producing a nonwoven fabric, which can provide a nonwoven fabric having better cushioning and touch properties while maintaining liquid permeability. A method of manufacturing a nonwoven fabric for a liquid-permeable surface sheet of an absorbent article according to the present invention includes an insertion section formed in a tapered shape toward the tip, a shank section that supports the insertion section, and an insertion section. A punching pin having a constriction-shaped projection (burr) control section formed between the shank section and the shank section has an opening forming step of forming an opening in the projecting portion. The insertion section and the protrusion control section of the protrusion are inserted through the protrusion from the non-skin-contact side of the protrusion toward the skin-contact side, and then from the skin-contact side of the protrusion toward the non-skin-contact side. By retracting, the protrusion (burr) generated on the skin contact side surface of the protrusion during pull-through insertion of the piercing pin is drawn into the non-skin contact side surface of the protrusion by the protrusion control section, and an opening is formed in the protrusion. Form. [Selection] Figure 1

Description

  The present invention relates to a method for producing a nonwoven fabric for liquid-permeable surface sheets of absorbent articles.

  Absorbent articles such as disposable diapers, sanitary napkins, and incontinence urine pads generally include an absorbent body formed of pulverized pulp and a superabsorbent polymer (SAP), which is formed of a nonwoven fabric. Covered with a liquid-permeable surface sheet.

  In order to realize the provision of a nonwoven fabric that is used as such a liquid-permeable surface sheet, has a cushioning property that is not easily crushed, and that facilitates the flow of liquid to increase the absorption rate from the through holes. The first protrusions protruding toward the first surface and the second protrusions protruding toward the second surface are alternately arranged in different directions, and a through hole is disposed at the top of the second protrusion so that the surrounding fibers are transparent. A nonwoven fabric that is oriented toward the holes is known (Patent Document 1).

  Further, in order to provide a three-dimensional sheet for absorbent articles, which has a large number of convex portions and is excellent in the stability of the three-dimensional shape of the convex portions, an opening is formed between adjacent convex portions. There is also known a three-dimensional sheet for absorbent articles that is made of a nonwoven fabric on which is formed, and at least a part of the convex portion is formed into a film (Patent Document 2).

JP 2013-133574 A JP 2007-130178 A

  However, there is a further need to provide a nonwoven fabric that is used as a liquid-permeable surface sheet of an absorbent article, and has a cushioning property and a touch property that are superior in cushioning and touch while having holes for liquid permeation. .

  For example, in the configuration disclosed in Patent Document 1, when forming irregularities on the fiber web, air is strongly blown onto the fiber web to form openings simultaneously with the formation of irregularities. It is necessary to apply a large pressure to the fiber web during the simultaneous formation of the opening and the opening, and the cushioning property (flexibility) may be impaired. Protrusions (burrs) that occur on the periphery do not necessarily protrude only on the non-skin contact side that does not contact the wearer's skin, but there are protrusions (burrs) on the skin contact side that contact the wearer's skin. There is a possibility that it may come out, and there is a possibility that the touch becomes worse. The configuration disclosed in Patent Document 2 also forms the heel portion and the opening at the same time. Like the configuration disclosed in Patent Document 1, there is a possibility that the cushioning property and the touch property may be hindered.

  In the present invention, in view of the above problems, a method for producing a nonwoven fabric for liquid-permeable surface sheet of an absorbent article, wherein a nonwoven fabric having protrusions and openings is formed without applying a large pressure to the fiber web. In addition, an object of the present invention is to provide a manufacturing method capable of controlling the direction of protrusions (burrs) generated on the periphery of the aperture when the aperture is formed.

According to invention of Claim 1, it is a nonwoven fabric for liquid-permeable surface sheets of an absorbent article, Comprising: By the manufacturing method of the nonwoven fabric which has a base part extended in planar shape, and several protrusion part which protrudes from this base part There,
By a perforating pin having an insertion section tapered toward the tip, a shank section that supports the insertion section, and a projection control section formed in a constricted shape between the insertion section and the shank section And an opening forming step of forming an opening in the protruding portion,
In the hole forming step, the insertion section and the protrusion control section of the perforation pin are inserted through the protrusion from the non-skin contact side surface of the protrusion toward the skin contact side, and then the protrusion of the protrusion By causing the skin contact side surface to move away from the protrusion portion toward the non-skin contact side surface, the protrusion generated on the skin contact side surface of the protrusion portion during penetration insertion of the perforation pin is caused by the protrusion control section to form the protrusion portion. There is provided a method for producing a nonwoven fabric, wherein an opening is formed in the protruding portion while being drawn into the non-skin contact side surface.

  In the first aspect of the present invention, the insertion section formed in a tapered shape toward the distal end portion, the shank section that supports the insertion section, and the protrusion formed in a constricted shape between the insertion section and the shank section ( Burr) A perforation pin having a control section is used to form an opening in the protruding portion of the nonwoven fabric, and the insertion section of the perforated pin and the protrusion (burr) control section are provided on the non-skin contact side surface of the protruding portion of the nonwoven fabric. From the skin contact side of the non-woven fabric protrusion to the non-skin contact side, and then retreat from the projection to the skin contact side to the skin contact side. By forming the piercing pin, the protrusion (burr) generated on the side surface of the wearer when penetrating the piercing pin into the protruding portion is transferred to the non-skin contact side surface when the piercing pin is removed from the protruding portion. To control It can be, while maintaining the transparency of the liquid, enabling the provision of non-woven fabric having a more excellent skin feel properties.

  According to the first aspect of the present invention, the opening is formed without damaging the surface of the protruding portion of the non-woven fabric by forming the opening with the perforating pin having the insertion section formed in a tapered shape toward the tip. It is possible to form a hole and to provide a nonwoven fabric having more excellent cushioning properties and touchability while maintaining liquid permeability.

According to invention of Claim 2, the manufacturing method of the said nonwoven fabric is a protrusion part formation process which forms the nonwoven fabric which has the said protrusion part, making heated fiber act on a fiber web and entangling a fiber, A projecting portion forming step of forming the projecting portion from the outer surface of the suction drum toward the inner side on the rotating suction drum;
A step of delivering the non-woven fabric formed with the protrusions to a transfer roller disposed adjacent to the suction drum, wherein the protrusions protrude outward from the outer surface of the transfer roller. And transferring and transferring to
The perforating pin is fixedly installed on a perforated roller disposed adjacent to the crossing roller, and in the perforation forming step, the crossing roller and the perforated roller rotate while the perforating part is rotated. Thus, the method for producing a nonwoven fabric according to claim 1, wherein an opening is formed in the protruding portion by inserting and withdrawing the perforating pin.

  In invention of Claim 2, it is a protrusion part formation process which forms the nonwoven fabric which has a protrusion part, making a fiber web entanglement by making heated air act on a fiber web, Comprising: On the rotating suction drum, A projecting portion forming step for forming a projecting portion from the outer surface of the suction drum toward the inner side, and a step of delivering the nonwoven fabric on which the projecting portion is formed to a crossing roller disposed adjacent to the suction drum, A transfer process in which the protruding portion is transferred and transferred so as to protrude from the outer surface of the crossing roller toward the outside, and the opening roller disposed adjacent to the crossing roller while the transfer roller and the opening roller rotate. The projecting part is formed by having an opening forming step for forming an opening in the projecting part by inserting and withdrawing the perforated pin fixedly installed to the projecting part. Even if the process and the hole forming process are performed as separate processes without performing them simultaneously, it is possible to perform smoothly in a series of continuous processes, and the protrusion forming process and the hole forming process for the nonwoven fabric are performed simultaneously. Compared to the case where it is carried out, a protruding portion and an opening to the protruding portion can be formed without applying a large pressure to the nonwoven fabric, and a superior cushion while maintaining liquid permeability. It is possible to provide a nonwoven fabric having properties.

According to invention of Claim 3, the manufacturing method of the said nonwoven fabric performs embossing with respect to a fiber web, and the protrusion part formation process which forms the nonwoven fabric which has the said protrusion part,
Transferring the non-woven fabric formed with the protrusion to a transfer roller, and transferring and transferring the protrusion so as to protrude from the outer surface of the transfer roller to the outside. And
The perforating pin is fixedly installed on a perforated roller disposed adjacent to the crossing roller, and in the perforation forming step, the crossing roller and the perforated roller rotate while the perforating part is rotated. Thus, the method for producing a nonwoven fabric according to claim 1, wherein an opening is formed in the protruding portion by inserting and withdrawing the perforating pin.

  In invention of Claim 3, it is the process of embossing with respect to a fiber web, and forming the nonwoven fabric which has a protrusion part, and the process of delivering the nonwoven fabric in which the protrusion part was formed to a crossing roller A transfer process in which the protruding portion is transferred and transferred so as to protrude from the outer surface of the crossing roller toward the outside, and the opening arranged adjacent to the crossing roller while the crossing roller and the opening roller rotate. By inserting and withdrawing a perforation pin fixedly installed on the hole roller with respect to the protruding portion, an opening forming step for forming an opening in the protruding portion is provided. Even if the hole forming step is performed as a separate step without being performed at the same time, it can be smoothly performed in a series of continuous steps, and the protrusion forming step and the hole forming step for the nonwoven fabric are performed. Compared with the case where it is sometimes performed, it is possible to form the protruding portion and the opening to the protruding portion without applying a large pressure to the nonwoven fabric, and more excellent while maintaining the liquid permeability. It is possible to provide a nonwoven fabric having cushioning properties.

  According to the invention described in claim 4, the outer surface of the crossing roller is a raised portion that engages with each of the protruding portions formed in the protruding portion forming step, and in the protruding portion forming step, A transfer ridge formed to be able to be transferred and transferred to the transition roller so as to protrude from the outer surface of the transition roller toward the outside while maintaining the shape of the projection formed. In the opening forming step, an opening is formed in the protruding portion by inserting and withdrawing the perforation pin with respect to the protruding portion of the nonwoven fabric engaged with the protruding portion for transfer. The manufacturing method of the nonwoven fabric of Claim 2 or Claim 3 to form is provided.

  In the invention according to claim 4, the protruding portion of the nonwoven fabric formed in the protruding portion forming step is transferred to the crossing roller so as to protrude from the outer surface of the crossing roller toward the outside side while maintaining its shape. The transfer ridges are formed on the outer surface of the transfer roller so that the transfer ridges can be handed over, and the piercing pins are inserted into and retracted from the protrusions of the nonwoven fabric engaged with the transfer ridges. By forming the opening in the part, it is possible to deliver the protrusion from the protrusion forming step to the transition roller and to form the hole in the protrusion while maintaining the shape of the formed protrusion.

  According to the invention described in claim 5, the perforating pin is heated to a predetermined temperature set in advance, and the predetermined temperature is higher than the softening point of the fibers constituting the nonwoven fabric and lower than the melting point. A method for producing a nonwoven fabric according to any one of claims 1 to 4 is provided.

  In the invention according to claim 5, the perforating pin heated to a predetermined temperature is inserted and withdrawn from the protruding portion of the nonwoven fabric, and an opening is formed in the protruding portion. On the other hand, it is possible to more reliably avoid a situation in which a desired opening is not formed without the piercing pin being pierced and a situation in which an unexpected melting occurs in the nonwoven fabric and a desired opening is not formed. .

  According to invention of Claim 6, the surface treatment which reduces the frictional resistance produced at the time of insertion of the said piercing pin to the said protrusion part is given to the surface of the said insertion division of the said piercing pin. The manufacturing method of the nonwoven fabric as described in any one of Claims 1-5 is provided.

  In the invention according to claim 6, the surface treatment for reducing the frictional resistance generated when inserting the perforated pin is inserted into and retracted from the protruding portion of the nonwoven fabric by inserting and retracting the perforated pin applied to the surface of the insertion section. By forming an opening in the part, it is possible to reduce the frictional resistance that occurs when inserting a perforated pin into the protruding part of the nonwoven fabric, and more reliably form the desired opening in the protruding part of the nonwoven fabric. It is possible to do.

  According to the present invention described in each claim, the nonwoven fabric for a liquid-permeable surface sheet of an absorbent article has a base portion that expands in a planar shape, and a plurality of protrusion portions that protrude from the base portion. When manufacturing non-woven fabrics where holes are formed in the part, protrusions (burrs) generated on the skin contact side surface when penetrating into the protruding part of the piercing pin are removed from the protruding part of the piercing pin. It can be controlled so as to be surely drawn into the non-skin contact side surface, and there is a common effect that it is possible to provide a non-woven fabric having better skin feel while maintaining liquid permeability.

It is a figure which shows one Embodiment of a series of processes in the manufacturing method of the nonwoven fabric which concerns on this invention. It is a figure which shows one Embodiment of a transcription | transfer process. It is a figure which shows one Embodiment of an aperture formation process. It is a figure which shows one Embodiment of the arrangement | positioning relationship between a transition roller and an aperture roller. It is a figure which shows one Embodiment of a piercing pin. It is a figure which shows typically one Embodiment of a series of processes of an opening formation process. It is a figure which shows typically one Embodiment of the nonwoven fabric before opening formation and after opening formation.

  Drawing 1 is a figure showing one embodiment of a series of processes in a manufacturing method of a nonwoven fabric concerning the present invention. In FIG. 1, 1 is a fiber web, 3 is a suction drum, 4 is a crossing roller, 5 is an aperture roller, 6 is a heated air injection device, 100 is a protruding portion forming step, 101 is a transfer step, and 102 is an aperture forming step. Each is shown.

  The nonwoven fabric having protrusions, which is brought about in the method for producing a nonwoven fabric according to the present invention, is suitable for use as a liquid-permeable surface sheet in body fluid-absorbing articles such as disposable diapers, sanitary napkins and incontinence patient pants. It is. The surface sheet covers the body fluid-absorbing absorbent body and is used on the assumption that it contacts the skin of the wearer of the body fluid-absorbing article. As a fiber constituting such a nonwoven fabric, for example, a composite staple fiber which is a core-sheath type fiber, the sheath component is composed of high-density polyethylene (HDPE), and the core component is composed of polyethylene terephthalate (PET) Can be used.

  In the embodiment shown in FIG. 1, the protrusion forming step and the hole forming step are combined, so that the protrusion forming step and the hole forming step are continued as separate steps. The projecting portion and the projecting portion can be smoothly executed in a series of steps without applying a large pressure as compared with the case where the projecting portion forming step and the hole forming step for the fiber web are performed simultaneously. It is possible to provide a non-woven fabric having better cushioning properties while maintaining liquid permeability.

Hereinafter, each process of a protrusion part formation process, a transfer process, and an opening formation process is demonstrated.
First, in the protruding portion forming step that is executed first, a nonwoven fabric having protruding portions is formed while entangled fibers by causing heated air to act on the fiber web 1 on the suction drum 3. The protrusion formed at this time is formed from the outer surface of the suction drum 3 toward the inner side on the rotating suction drum. Further, a fiber web 1 formed by opening a fiber assembly with a card machine is delivered to the suction drum 3. In the present embodiment, thermoplastic fibers or natural fibers are opened with a spreader, set to have a desired basis weight with a card machine, formed, and the card web that has been formed is formed with a belt conveyor. The fiber web 1 that has been transported, transported to a heat treatment machine set to a desired temperature, heat-treated and wound up is delivered to the suction drum 3. In addition, formation of the nonwoven fabric which has a protrusion part in this protrusion part formation process is not restricted to this embodiment, For example, you may perform by embossing. When forming a nonwoven fabric having protrusions by embossing, the fiber web is embossed to form a nonwoven fabric having protrusions, and after the embossing, the fibers are heat-sealed. Therefore, you may have a process of making heated air act on a nonwoven fabric.

  In the protrusion forming step shown in FIG. 1, the fiber web 1 is processed by the heated air jet device 6. The heated air injection device 6 is a means for forming protrusions on the fiber web 1, and includes a suction drum 3 that rotates in the machine direction MD, and first, second, and third nozzle assemblies for heating air injection. Including. Each of the first, second, and third nozzle assemblies includes first, second, and third nozzle manifolds and a single nozzle. Each of the first, second, and third nozzle manifolds extends in the axial direction of the suction drum 3, that is, in the cross direction CD with respect to the machine direction MD, and is arranged at a predetermined interval in the circumferential direction of the suction drum 3. Has been. Each of the first, second, and third single nozzles is attached to each of the first, second, and third nozzle manifolds at a required pitch in the cross direction CD, and is required from the peripheral surface of the suction drum 3. The dimensions are separated. The first, second, and third nozzle assemblies can eject heated air at a required temperature from each of the first, second, and third single nozzles with a required air volume.

  The suction drum 3 is formed with a plurality of through holes on its peripheral surface, and the through holes are connected to the suction mechanism of the suction drum 3. The peripheral speed of the suction drum 3 is the same as the conveying speed of the nonwoven fabric.

  In the protruding portion forming step shown in FIG. 1, the first and second nozzle assemblies compress the fibrous web in a bulky state after leaving the card machine and prior to the processing of the fiber web 1 by the third nozzle assembly; Used to smooth the surface. For this purpose, the temperature and pressure of the heated air from the first and second nozzle assemblies are softened to such an extent that the fibers constituting the fiber web 1 are not melted, and air injection pressure is applied to the softened fibers. Thus, the thickness is set to be compressed and the surface of the nonwoven fabric can be made smooth. The heated air from the third nozzle assembly is set so that its temperature and pressure can form protrusions on the nonwoven fabric that is compressed and in a smooth state.

  Due to the action of the heated air from the first and second nozzle assemblies in such a protrusion forming step, the surface of the nonwoven fabric brought from the fiber web 1 is smoothened with less irregularities due to fiber fluffing and the like. As a result, the surface of the nonwoven fabric is smooth and soft to the touch. A portion to which heated air sprayed from the third nozzle assembly is attached is formed as a protruding portion, and the other portion is formed as a planar base portion. When the base is formed, the non-woven fabric is smooth due to the action of the first and second nozzle assemblies, so that the height of the base, which is the dimension from the back of the non-woven fabric, is uniform. It is easy to become a thing. The protruding portion is formed from the outer surface of the suction drum 3 toward the inner side, and for the same reason as the base portion, the depth, in other words, the dimension from the back surface of the nonwoven fabric tends to be uniform.

  In the transfer process subsequent to the protrusion forming process, the nonwoven fabric on which the protrusion is formed is handed over to the transfer roller 4 disposed adjacent to the suction drum 3, and is formed in the protrusion forming process at the time of the handing over. The protruding portion is transferred and transferred so as to protrude from the outer surface of the roller 4 toward the outside.

  FIG. 2 is a diagram showing an embodiment of the transfer process. In FIG. 2, 2 is a protrusion, 7 is a transfer bulge, and 8 is an insertion hole. On the outer surface of the transition roller 4 is a raised portion 7 that engages with each of the protrusions 2 formed from the outer surface of the suction drum 3 toward the inner side, and from the outer surface of the suction drum 3 to the inner side. The protruding portion 2 of the nonwoven fabric formed toward the transfer roller 4 can be transferred and transferred to the transfer roller 4 so as to protrude from the outer surface of the transfer roller 4 toward the outside while maintaining its shape. The formed transfer ridge 7 is formed. As can be understood from FIG. 2, the suction drum 3 and the transfer roller 4 are formed on the outer surface of the transfer drum 4 and the protruding portion 2 of the nonwoven fabric formed from the outer surface of the suction drum 3 toward the inner side. It is controlled to rotate synchronously so as to provide the desired engagement with the raised ridge 7. The transfer ridge 7 formed on the outer surface of the transfer roller 4 is provided with an insertion hole 8 into which a piercing pin is inserted in order to form an opening in the protruding portion 2 of the nonwoven fabric.

  In the opening forming step subsequent to the transfer step, the opening roller disposed adjacent to the transfer roller 4 on each of the protruding portions 2 of the nonwoven fabric transferred so as to protrude from the outer surface of the transfer roller toward the outside. An aperture is formed by a perforated pin that is fixedly attached to 5.

  FIG. 3 is a view showing an embodiment of the hole forming step, FIG. 4 is a view showing an embodiment of the positional relationship between the transition roller and the hole roller, and FIG. It is a figure which shows embodiment. 3 to 5, 9 is a perforation pin, 10 is an insertion section, 11 is a protrusion (burr) control section, 12 is a shank section, and 13 is a tip angle.

  On the outer surface of the perforation roller 5, a perforation pin 9 formed so as to be able to provide an opening to each of the protruding portions 2 of the nonwoven fabric transferred so as to project outward from the outer surface of the crossing roller 4. Is installed immovably.

  As can be understood from FIG. 5, the piercing pin 9 is an insertion section 10 having a distal end portion and a bottom surface portion, and the insertion section 10 formed in a tapered shape toward the distal end portion, and supports the insertion section 10. It is formed with a shank section 12 and a protrusion (burr) control section 11 formed in a constricted shape between the insertion section 10 and the shank section 12. If the tip angle 13 of the tapered insertion section 10 is sharper than 30 degrees, it may be difficult to enter the insertion hole 8 of the transfer ridge 7 formed on the outer surface of the transition roller 4. When the angle is wider than 40 degrees, the frictional resistance generated when the perforating pin 9 is inserted into the protruding portion 2 may be excessively generated. Therefore, the tip angle 13 of the tapered insertion section 10 is preferably in the range of 30 to 40 degrees.

  As can be understood from FIG. 3, in the opening forming step, the transfer roller 4 and the opening roller 5 are formed on the outer surface of the transfer roller 4 and are engaged with the transfer ridges 7. Are controlled to rotate synchronously to provide the desired perforation.

  In the opening forming step, the perforation pins 9 heated to a predetermined temperature may be inserted and withdrawn from the protruding portion 2 of the nonwoven fabric to form the opening in the protruding portion 2. The predetermined temperature in this case is higher than the softening point of the fibers constituting the nonwoven fabric (that is, the temperature at which the nonwoven fabric softens and begins to be deformed) and is higher than the melting point (the temperature at which melting begins when the temperature increases). Also, the temperature is set to a low temperature, and is determined as appropriate based on prior analysis evaluation and test evaluation. By inserting and withdrawing the perforated pin 9 heated to a predetermined temperature with respect to the protruding portion 2 of the nonwoven fabric so as to form an opening in the protruding portion, the perforated pin 9 is formed with respect to the protruding portion 2 of the nonwoven fabric. It is possible to more reliably avoid a situation in which a desired opening is not formed without piercing and a situation in which an unexpected melting occurs in the nonwoven fabric 1 and a desired opening is not formed.

  Further, in the opening forming step, the surface of the insertion section is subjected to a surface treatment for reducing frictional resistance that occurs when the piercing pin 9 is inserted into and withdrawn from the protruding portion 2 when the piercing pin 9 is inserted into the protruding portion 2. It may be done with a perforated pin. The surface of the insertion section is subjected to surface treatment for reducing frictional resistance generated when the perforated pin 9 is inserted, and the perforated pin 9 is inserted into and retracted from the protruding portion 2 of the nonwoven fabric, so that the protruding portion 2 is opened. By making it form, it is possible to reduce the frictional resistance that occurs when inserting the perforating pin 9 into the protruding portion 2 of the nonwoven fabric, and to form a desired opening in the protruding portion 2 of the nonwoven fabric more reliably. Is possible.

  FIGS. 6A to 6D are diagrams schematically showing an embodiment of a series of processes in the hole forming step. Fig.7 (a) is a figure which shows one Embodiment of the nonwoven fabric before opening formation, FIG.7 (b) is a figure which shows one Embodiment of the nonwoven fabric after opening formation.

  In one embodiment of a series of processes of the opening forming step shown in FIGS. 6A to 6D, the protruding portion 2 of the nonwoven fabric formed in the protruding portion forming step is formed on the outer surface of the crossing roller 4. The piercing pin 9 heated to a predetermined temperature by the heating means provided in the aperture roller 5 is pierced by heating with respect to the protruding portion 2 of the nonwoven fabric engaged with the bulge 7 for transfer, Openings are formed through the nonwoven fabric. With reference to FIGS. 6A to 6D, the process of forming the opening will be described in more detail.

  In this process, the punch pin 9 is heated to a predetermined temperature in advance, and the crossover roller 4 and the opening roller 5 are rotated in synchronization with each other, so that the protrusion of the non-woven fabric as shown in FIG. The non-skin contact side surface 14 of the part 2 and the perforation pin 9 are made to face each other. The predetermined temperature here is a temperature higher than the softening point of the fibers constituting the nonwoven fabric and lower than the melting point, and is appropriately determined based on a prior analysis evaluation and a test evaluation.

  Next, as shown in FIG. 6 (b), the insertion section 10 and the protrusion (burr) control section 11 of the piercing pin 9 are directed from the non-skin contact side surface 14 to the skin contact side surface 15 of the protruding portion 2 of the nonwoven fabric. The penetrating part 2 is inserted through. At this time, the insertion section 10 of the punch pin 9 pierced by the protruding portion 2 of the nonwoven fabric penetrates through the nonwoven fabric while pushing a part of the fibers constituting the nonwoven fabric against the skin contact side surface 15 of the protruding portion 2. Here, since the heating temperature of the perforation pins 9 is higher than the softening point of the fibers constituting the nonwoven fabric, the insertion section 10 and the protrusion (burr) control section 11 of the perforation pins 9 easily penetrate the nonwoven fabric. Moreover, since the temperature is lower than the melting point of the fibers constituting the nonwoven fabric, it is possible to avoid a situation where the fibers constituting the nonwoven fabric are melted.

  In the process shown in FIG. 6C following FIG. 6B, the insertion section 10 and the protrusion (burr) control section 11 of the piercing pin 9 easily penetrate the nonwoven fabric while softening the fibers constituting the nonwoven fabric. And exposed from the skin contact side surface 15 of the protruding portion 2 of the nonwoven fabric. At this time, a part of the fibers constituting the nonwoven fabric is dragged by the perforating pins 9 and protrudes from the skin contact side surface 15 of the protruding portion 2 of the nonwoven fabric, and a protrusion (burr) 16 is generated on the skin contact side surface of the protruding portion 2.

  In the process shown in FIG. 6 (d) following FIG. 6 (c), the piercing pin 9 is withdrawn from the protrusion 2 toward the non-skin contact side 14 from the skin contact side 15 of the non-woven protrusion 2. At this time, the protrusion (burr) 16 generated on the skin contact side surface when the perforated pin 9 is inserted through the protruding portion 2 of the nonwoven fabric can be drawn into the non-skin contact side surface by the protrusion (burr) control section 11. That is, the protrusion (burr) generated on the skin contact side surface during penetration insertion of the perforated pin 9 with respect to the protruding portion 2 of the nonwoven fabric can be controlled so as to be drawn into the non-skin contact side surface when moving away. It is possible to provide a non-woven fabric having better touch while maintaining the liquid permeability. As shown in FIG. 7, when the perforating pin 9 is withdrawn from the protruding portion 2 of the nonwoven fabric, protrusions (burrs) 17 are generated on the non-skin contact side surface 14 of the protruding portion 2 of the nonwoven fabric. The non-skin contact side surface 14 of the part 2 is not a surface that contacts the skin and does not adversely affect the touch.

  As mentioned above, according to the manufacturing method of the nonwoven fabric concerning the present invention, it is a nonwoven fabric for liquid-permeable surface sheets of an absorptive article, and has a base part extended in the shape of a plane, and a plurality of projection parts projected from the base part, In the production of a nonwoven fabric in which an opening is formed in the protruding portion, the base portion is directed to the skin side, and the protruding portion is directed to the absorber side, and the opening is more reliably formed. It is possible to control the direction in which protrusions (burrs) generated at the periphery of the aperture portion can be controlled, and it is also possible to perform the projection portion forming step and the aperture forming step as separate steps instead of simultaneously. It is possible to perform smoothly in the process of the above, and compared with the case where the protrusion forming process and the hole forming process for the nonwoven fabric are performed simultaneously, without applying a large pressure to the nonwoven fabric, the protrusion and the It is possible to form an opening to the protrusion It can be, while maintaining the transparency of the liquid, enabling the provision of non-woven fabric with more excellent cushioning and feel properties.

DESCRIPTION OF SYMBOLS 1 Fiber web 2 Protrusion part 3 Suction drum 4 Crossing roller 5 Opening roller 6 Heating air injection apparatus 7 Bumping part for transfer 8 Insertion hole 9 Drilling pin 10 Insertion section 11 Protrusion (burr) control section 12 Shank section 13 Tip angle

Claims (6)

A non-woven fabric for a liquid-permeable surface sheet of an absorbent article, which is a method for producing a non-woven fabric having a base extending in a planar shape and a plurality of protruding portions protruding from the base,
By a perforating pin having an insertion section tapered toward the tip, a shank section that supports the insertion section, and a projection control section formed in a constricted shape between the insertion section and the shank section And an opening forming step of forming an opening in the protruding portion,
In the hole forming step, the insertion section and the protrusion control section of the perforation pin are inserted through the protrusion from the non-skin contact side surface of the protrusion toward the skin contact side, and then the protrusion of the protrusion By causing the skin contact side surface to move away from the protrusion portion toward the non-skin contact side surface, the protrusion generated on the skin contact side surface of the protrusion portion during penetration insertion of the perforation pin is caused by the protrusion control section to form the protrusion portion. The manufacturing method of the nonwoven fabric which forms an opening in the said protrusion part, drawing in to the non-skin contact side surface. The method for producing the nonwoven fabric is as follows:
A projecting portion forming step of forming a nonwoven fabric having the projecting portion while entangled fibers by causing heated air to act on the fiber web, and on the rotating suction drum, from the outer surface of the suction drum to the inner side Projecting part forming step of forming the projecting part toward
A step of delivering the non-woven fabric formed with the protrusions to a transfer roller disposed adjacent to the suction drum, wherein the protrusions protrude outward from the outer surface of the transfer roller. And transferring and transferring to
The perforating pin is fixedly installed on a perforated roller disposed adjacent to the crossing roller, and in the perforation forming step, the crossing roller and the perforated roller rotate while the perforating part is rotated. The manufacturing method of the nonwoven fabric according to claim 1, wherein an opening is formed in the protruding portion by inserting and retracting the punch pin. The method for producing the nonwoven fabric is as follows:
A protruding portion forming step for embossing the fibrous web and forming a nonwoven fabric having the protruding portion,
Transferring the non-woven fabric formed with the protrusion to a transfer roller, and transferring and transferring the protrusion so as to protrude from the outer surface of the transfer roller to the outside. And
The perforating pin is fixedly installed on a perforated roller disposed adjacent to the crossing roller, and in the perforation forming step, the crossing roller and the perforated roller rotate while the perforating part is rotated. The manufacturing method of the nonwoven fabric according to claim 1, wherein an opening is formed in the protruding portion by inserting and retracting the punch pin. On the outer surface of the crossing roller, a protruding portion that engages with each of the protruding portions formed in the protruding portion forming step, and the protruding portion formed in the protruding portion forming step is shaped. A transfer ridge formed so as to be able to be transferred and transferred to the transition roller so as to protrude from the outer surface of the transition roller toward the outside while being maintained,
In the opening forming step, an opening is formed in the protruding portion by inserting and retracting the perforating pin with respect to the protruding portion of the nonwoven fabric engaged with the transfer ridge. The manufacturing method of the nonwoven fabric of Claim 2 or Claim 3.   The said perforation pin is heated to the preset predetermined temperature, and the said predetermined temperature is made into the temperature which is higher than the softening point of the fiber which comprises a nonwoven fabric, and is lower than melting | fusing point. The manufacturing method of the nonwoven fabric as described in any one claim.   The surface treatment which reduces the frictional resistance produced at the time of insertion of the said piercing pin to the said protrusion part is given to the surface of the said insertion division of the said piercing pin. The manufacturing method of the nonwoven fabric of Claim.

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