JPH09563A - Disposable diaper and its manufacturing device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a disposable diaper that has excellent fit around the legs, does not open the waist and has excellent liquid leakage prevention performance. [Constitution] Top sheet 2, back sheet 3 and absorber 4
A leg gather is formed by arranging the elastic member 10 and is divided into an abdominal part A, a dorsal part C and a crotch part B. The crotch part B includes the top sheet 2 and the back sheet. 3 has a tubular portion formed by heat-sealing with each other, and the elastic member 10 is continuously arranged from the ventral side portion A to the dorsal side portion C. In the state, the disposable diapers that are inserted in the tubular portion in the state of being inserted and are placed in the ventral side portion A and the back side portion C, and the convex portions that form the tubular portions on the left and right sides respectively. An apparatus for manufacturing the above-mentioned disposable diaper, which has a heat-sealing member including a roller having a shaped portion, and is configured to allow an elastic member to be inserted into the tubular portion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable diaper excellent in fit and liquid leakage prevention.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 1, a disposable diaper 101 has a liquid-permeable top sheet (not shown) and a liquid-impermeable back sheet 103. The top sheet and the back sheet 1
03 and an absorber (not shown) interposed between them, the elastic members 110 are arranged to form leg gathers, and in the vertical direction thereof, the ventral side portion A and the back side portion C are provided.
And a crotch portion B located between the ventral side portion A and the back side portion C
It is divided into.

The elastic member 110 forming the leg gathers has the ventral side portion A and the back side portion C.
The diaper was stretched mainly only on the crotch portion B so as not to be stretchable in the vertical direction. The disposable diaper having elastic members arranged in this manner is manufactured by laying an elastic member in a stretched state on a continuous body of a back sheet to which an adhesive is applied only to a portion corresponding to a crotch part to manufacture a continuous body of diapers. Then, the continuous body was industrially manufactured by cutting it at a predetermined position.

However, the conventional disposable diaper 101 manufactured in this manner does not have an adhesive applied to the abdominal side and the dorsal side so that the elastic member in the stretched state is not fixed, as shown in FIG. As described above, there is a problem in that the mouth opening 130 occurs in the waist portion on the ventral side and the back side of the diaper, and liquid leakage occurs from the mouth opening 130.

Further, in the conventional disposable diaper,
In order to improve the fitting property around the legs, the leg portions are formed to be curved, and the elastic members are also laid so as to be curved accordingly. However, conventionally, since the elastic member in the stretched state is brought into contact with the portion to which the adhesive is applied to bond and fix the elastic member, the elastic member is not fixed at the same time as the contact, and the elastic member is not fixed. There is a problem that the desired shape and liquid leakage prevention property cannot be obtained due to the shrinkage of the product from the desired shape during installation.

Therefore, an object of the present invention is to provide a disposable diaper which is excellent in fit around the legs, does not cause mouth opening in the waist and has excellent liquid leakage prevention performance, and a manufacturing apparatus for the disposable diaper. is there.

[0007]

Means for Solving the Problems As a result of intensive studies for solving the above problems, the present inventors have arranged elastic members in a relaxed state on the back side and the abdomen side of a diaper, and have a crotch portion. In the above, it was found that a disposable diaper arranged in an expanded state can achieve the above object.

The present invention has been made on the basis of the above findings, and includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber interposed between the top sheet and the back sheet. In the disposable diaper provided with elastic members and formed with leg gathers, the disposable diaper includes a ventral side portion, a back side portion, and a crotch portion located between the ventral side portion and the back side portion. The crotch part has a tubular portion formed by heat-sealing an outer surface material located outside of the elastic member and an inner surface material located inside thereof on both left and right sides thereof, The elastic member is
It is arranged continuously from the abdominal part to the dorsal part, and in the crotch part, it is arranged by being inserted into the tubular part in the stretched state to form the leg gather, and the abdominal part and Provided is a disposable diaper, characterized in that, in the back side portion, it is arranged in a relaxed state by being adhesively fixed between the outer surface material and the inner surface material.

Further, the present invention comprises, as a preferable apparatus for manufacturing the above disposable diaper, a set of two rollers,
At least one of the rollers is provided on each of the left and right sides thereof in a circumferential direction of the roller by heat-sealing the inner surface material and the outer surface material in parallel at a predetermined interval to form a tubular portion. And a heat seal member having at least two convex portions so that an elastic member can be inserted into the tubular portion.

[0010]

In the disposable diaper of the present invention, the elastic members are adhered and fixed by the outer surface material and the inner surface material in the ventral side portion and the back side portion of the disposable diaper, so that the diaper does not expand and contract in the vertical direction. Elastic members that form leg gathers without opening the mouth are arranged. In addition, since the elastic member is inserted in the stretched state in the tubular portion formed by the outer surface material and the inner surface to form leg gathers, the elastic shape is laid as it is without being affected by the contraction of the elastic member. The member can be fixed.

[0011]

The present invention will be described in more detail with reference to the following examples. An embodiment of the disposable diaper of the present invention will be described with reference to FIGS. 2 is a perspective view showing a first embodiment of the disposable diaper of the present invention, FIG. 3 is a partially cutaway exploded view of the disposable diaper shown in FIG. 2, and FIG.
FIG. 4 is a sectional view taken along line IV-IV in FIG. 3.

The disposable diaper 1 of this embodiment shown in FIGS. 2 and 3 has a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and a space between the top sheet 2 and the back sheet 3. The elastic member 10 including the absorber 4 interposed
Are arranged to form leg gathers 7. Such a structure is similar to that of a generally known disposable diaper.

More specifically, in the disposable diaper 1 of this embodiment, fastening tapes 8 are provided on the left and right edges of the waist portion 5 of the back portion C, and the fastening tapes 8 are attached to the back sheet 3. This is a deployable disposable diaper that is used by being attached to a landing tape 9 provided on the surface.

In the disposable diaper 1, the central portion in the longitudinal direction is curved in an overflowing hourglass shape to form leg portions 6, and the waist portion 5 of the abdominal portion A and the back portion C is formed. The elastic members 5'of the waist portion are arranged on each of them. Further, as the top sheet 2, the back sheet 3, the absorber 4, and the elastic member 10,
Conventionally known materials can be used without particular limitation.

As shown in FIGS. 3 and 4, the disposable diaper 1 is located between the abdominal part A, the dorsal part C, and the abdominal part A and the dorsal part C. Divided into crotch part B. Further, as shown in FIG. 4, the crotch part B has a back sheet 3 as an outer surface material located outside the elastic member 10 and a top sheet 2 as an inner surface material located inside, on both left and right sides thereof. Has a tubular portion 20 formed by heat sealing. In addition, the elastic member 10
Are continuously arranged from the abdominal part A to the dorsal part C, and in the crotch part B, the tubular part 2 is stretched.
The leg gathers 7 are formed by being inserted through the inside of the back seat 3, and the leg gathers 7 are formed. In the ventral side portion A and the back side portion C, the back sheet 3 and the top sheet 2 are adhesively fixed in a relaxed state. Are distributed.

More specifically, the ventral side portion A will be described.
Is a portion that abuts on the wearer's ventral waist and waist circumference when worn, and the back side portion C is a portion that abuts on the wearer's back waist and waist circumference when worn, and the crotch portion C is , A part that comes into contact with the crotch of the wearer when worn. The tubular portion 20 is heat-sealed at four positions along the curved shape of the leg portion 6 on the left and right sides of the crotch portion C along the curved shape of the leg portion 6 to form the leg portion 6 respectively. Three arcs are provided along the arc. The elastic members 10 are arranged from the edge of the ventral side A to the edge of the dorsal side C, respectively. In the ventral side A and the dorsal side C, the backsheet is provided. 3 and the top sheet 2 are sandwiched and fixed by adhesion, and in the crotch portion B, they are arranged in the stretched state without being adhered in the tubular portion 20.

In the disposable diaper 1 of this embodiment, as described above, the elastic member 10 is adhered and fixed by the top sheet 2 and the back sheet 3 in the ventral side portion A and the back side portion C, respectively. As a result, the mouth does not open and liquid does not leak from the waist. In the crotch C, the elastic member 1
Since 0 is inserted and arranged in the tubular portion 20, it can be arranged in a desired shape without being affected by the elasticity of the elastic member 10 and is excellent in fit around the legs. Further, since no adhesive is used to fix the elastic member 10 in the leg portion, the flexibility of each sheet is maintained and the texture around the legs is good.

Next, a preferable apparatus for manufacturing the disposable diaper of the present invention will be described with reference to FIGS.
Here, FIG. 5 is a schematic view showing a main part of the manufacturing apparatus of the present invention, and FIG. 6 is a front view showing a heat seal member in the manufacturing apparatus shown in FIG.

The disposable diaper manufacturing apparatus 50 of the present invention
Is composed of a set of two rollers 52,
At least one of the rollers 52 forms a tubular portion 20 by heat-sealing the top sheet 2 as the inner surface material and the back sheet 3 as the outer surface material in parallel at predetermined intervals on both left and right sides thereof. The heat-sealing member 51 having at least two convex portions 53 continuously provided in the circumferential direction of the tubular portion 20.
The elastic member 10 can be inserted therein.

More specifically, the manufacturing apparatus 50 is provided with the heat seal member 51, and comprises a continuous sheet 2'of the top sheet 2, a continuous body 10 'of the elastic member 10 and a predetermined position. The absorber 4 and the elastic member 5'of the waist portion are placed on the abdomen A and the back C
The continuous sheet 3'of the back sheet 3 coated with an adhesive at a predetermined position corresponding to the above is integrated to manufacture a continuous body of diapers. Then, the obtained continuous body 1'of the diaper is cut at a predetermined position to produce the disposable diaper 1
Can be obtained.

The manufacturing apparatus 50 of this embodiment is shown in FIG.
As shown in FIG.
Each of the rollers 52 has the convex portion 53 so as to correspond to each other.
Is composed of a straight portion 53a along the circumferential direction and a curved portion 53b curved toward the inner side of the roller. And
In the heat seal member 51, by rotating the roller 52 in the direction of arrow D, the continuous sheet 2'of the top sheet, the absorber 4 and the elastic member 5'of the waist portion are placed and the adhesive is applied. 'and, the web 10 of the elastic members' continuous sheet 3 in the backsheet formed by coating and, respectively retraction in the direction of the arrow D ₁ direction,
Further, the continuous body 10 'of the elastic member can be drawn between the continuous sheet 2'and the continuous sheet 3'. At this time, the continuum 10 'is
As shown in FIG. 6, the elastic members 10 are drawn into between the respective convex portions 53, so that the tubular member 20 can be formed and at the same time, the elastic member 10 can be inserted into the tubular member 20. ing. Further, the continuous body 10 ′ of the elastic member is supplied to the crotch part B at the same speed as the continuous sheets 2 ′ and 3 ′ at the portions corresponding to the abdominal part A and the back part C. In the corresponding portion, the continuous sheets 2'and 3'are supplied at a speed slower than the supply speed. As a result, the elastic member 10 can be arranged in the relaxed state on the abdomen A and the back C and in the stretched state on the crotch B.

The disposable diaper of the present invention is not limited to the embodiment shown in FIGS. 1 to 4 described above, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the expandable diaper has been described as an example, but the invention can also be applied to a pants-type disposable diaper. Further, the elastic member does not have to be fixed to both the inner surface material and the outer surface material, and can be fixed to only one of the outer surface material and the inner surface material. Further, as the outer surface material or the inner surface material, a member other than the back sheet and the top sheet may be used,
Further, the tubular portion may be linear, that is, the elastic member may be linearly arranged. The sealing method for forming the tubular portion can also be performed by a method other than heat sealing, for example, an ultrasonic sealing method or a method of applying a hot melt adhesive in a linear shape.

[0023]

EFFECT OF THE INVENTION The disposable diaper of the present invention is excellent in the fit around the legs, does not open the waist, and
It has excellent liquid leakage prevention performance. Moreover, the manufacturing apparatus of the disposable diaper of this invention can manufacture the said disposable diaper with high productivity.

[Brief description of drawings]

FIG. 1 is a development view showing a conventional disposable diaper with its topsheet and absorbent body omitted.

FIG. 2 is a perspective view showing an embodiment of the disposable diaper of the present invention.

FIG. 3 is a partially cutaway exploded view showing the disposable diaper of the present invention shown in FIG.

4 is a cross-sectional view taken along the line IV-IV of the diaper shown in FIG.

FIG. 5 is a schematic view showing a main part of the manufacturing apparatus of the present invention.

6 is a front view showing a heat seal member in the manufacturing apparatus shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Top sheet 3 Back sheet 4 Absorber 5 Waist part 6 Leg part 7 Leg gather A A ventral part B Crotch part C Dorsal part 10 Elastic member 20 Tubular part 50 Manufacturing device 51 Heat seal member 52 Roller 53 Convex shape Part 53a Straight part 53b Curved part

Claims (5)

[Claims] 1. A leg sheet having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body interposed between the top sheet and the back sheet, wherein an elastic member is arranged to form a leg gather. In the formed disposable diaper, the disposable diaper is divided into an abdominal part, a dorsal part, and a crotch part located between the abdominal part and the dorsal part, and the crotch part is On both the left and right sides, there is a tubular portion formed by heat-sealing an outer surface material located on the outside of the elastic member and an inner surface material located on the inner side of the elastic member. It is arranged continuously over the part, in the crotch part, is arranged by being inserted through the tubular part in the stretched state to form the leg gather, and in the ventral side part and the back side part, In the relaxed state, the outer surface material and the above Disposable diapers characterized in that the disposable diapers are arranged such that they are adhesively fixed to the inner surface material. 2. The disposable diaper according to claim 1, wherein the outer surface material is a back sheet and the inner surface material is a top sheet. 3. The disposable diaper according to claim 1, wherein the tubular portion is provided in an arc shape along the leg portion. 4. The manufacturing apparatus for manufacturing the disposable diaper according to claim 1, comprising a set of two rollers, at least one of the rollers having the inner surface member and the inner surface member on both left and right sides thereof. A heat-sealing member having at least two convex portions continuously provided in the circumferential direction of the roller, which form a tubular portion by heat-sealing outer surface materials in parallel at a predetermined interval, A manufacturing apparatus, wherein an elastic member can be inserted into the part. 5. The two rollers each have the convex portion so as to correspond to each other, and the convex portion is a straight portion along the circumferential direction and an inner side of the roller. The manufacturing apparatus according to claim 4, wherein the manufacturing apparatus comprises a curved portion that is curved toward.