JP5102119B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article.

Conventionally, in a disposable diaper provided with an absorbent main body including an absorbent core and an outer packaging material joined to the non-skin contact surface side of the absorbent main body, the object is to improve the fit of the diaper to the wearer, etc. In addition, there is known one in which a waistline gather is provided at a waistline portion on the abdomen and back sides of the outer packaging material (see, for example, Patent Document 1 below). In the pants-type disposable diaper described in Patent Document 1, the outer packaging material is formed of an inner layer sheet, an outer layer sheet, and a plurality of elastic members disposed between the two sheets, and the waistline gather is the elastic member at the waistline part. The member is formed by intermittently joining the inner layer sheet and the outer layer sheet.
In addition, Patent Document 2 relates to a so-called unfolded disposable diaper having a fastening tape, and a tape vicinity expansion / contraction portion that expands and contracts in conjunction with the fastening tape is disposed between the two sheet materials and the two sheet materials. It describes that it comprises using the elastic elastic member which has several elastic members. The two sheet members in the elastic elastic member are intermittently joined, and the elastic member is disposed so as not to pass through the joint portion.

JP 2004-89403 A JP 2005-80859 A

However, in the pants-type disposable diaper described in Patent Document 1, the waistline gather is formed by joining an elastic member to the inner layer sheet and the outer layer sheet with a hot melt adhesive. Therefore, it is inferior to the breathability and softness of a waist part. In addition, since the contraction of the elastic member is hindered, it is necessary to increase the amount of the elastic member or use an elastic member having a large contraction force in order to obtain a sufficient contraction force of the waist gathers. It is not fully utilized. Furthermore, it is inferior also to the cushioning property of the thickness direction of a waistline gather.
Moreover, in the expansion | deployment type disposable diaper of patent document 2, the hook of the substantially same magnitude | size is formed in the front and back of the elastic elastic member mentioned above. Therefore, it is difficult to make different structures on the front and back of the outer packaging material.

  Accordingly, an object of the present invention is to provide an absorptive material having a gather formed of a composite stretchable part, comprising an absorbent main body including an absorbent core and an outer packaging material bonded to the non-skin contact surface side of the absorbent main body. An object of the present invention is to provide an absorbent article having excellent breathability and softness of a composite stretchable part and having different cushioning properties on the front and back of an outer packaging material.

  The present invention includes an absorbent main body including an absorbent core and an outer packaging material bonded to the non-skin contact surface side of the absorbent main body, and the outer packaging material is provided in the abdomen, crotch, and back side in the longitudinal direction. The outer packaging material has an outer layer sheet, an inner layer sheet, and a plurality of elastic members disposed between both sheets, and the outer packaging material is gathered by a composite stretchable portion. The composite stretchable portion is formed by joining the outer layer sheet and the inner layer sheet to each other at a number of joint portions dispersed in both the stretch direction of the composite stretchable portion and the direction orthogonal thereto, and an elastic member is connected to the joint portion. A plurality of sheets which are arranged so as not to pass through and are fixed between the outer layer sheet and the inner layer sheet at both ends of the elastic member, and each of the outer layer sheet and the inner layer sheet continuously extends over a plurality of elastic members. Forming a fold and outside It is obtained by achieving the above object by the size of the folds formed in the folds and the inner layer sheet formed into a sheet to provide a different absorbent articles.

  According to the absorbent article of the present invention, the absorbent article includes an absorbent main body including an absorbent core and an outer packaging material joined to the non-skin contact surface side of the absorbent main body, and has a gather formed from a composite stretchable part. In the absorbent article, the composite stretchable part has excellent breathability and softness, and has different cushioning properties on the front and back of the outer packaging material.

Hereinafter, a pants-type disposable diaper as an absorbent article of the present invention will be described with reference to the drawings based on a first embodiment which is a preferred embodiment thereof.
The pants-type disposable diaper 1 of 1st Embodiment is the outer packaging material joined to the non-skin contact surface side of the absorptive main body 3 containing the absorptive core 34 and the absorptive main body 3, as shown in FIGS. 2 and the outer packaging material 2 is divided in the longitudinal direction into an abdominal side A, a crotch C, and a back side B, and both side edges of the abdominal side A and the back side B of the outer packaging material 2 are A pair of side seal parts 11, a waist opening part 12, and a pair of leg opening parts 13 are formed by bonding.

  The outer packaging material 2 includes an outer layer sheet 21b, an inner layer sheet 22, and a third sheet 21a between the outer layer sheet 21b and the inner layer sheet 22, and a plurality of sheets disposed between the inner layer sheet 22 and the third sheet 21a. The elastic members 23, 24, 25, and 26 are provided. The absorptive main body 3 is disposed from the abdominal side A to the back side B of the outer packaging material 2, and the waist portion D in the abdominal side A and the back side B of the outer packaging material 2 is combined with the elastic expansion and contraction. A waistline gather G1 formed from the portion 4 (see FIG. 6) is provided.

  Specifically, the disposable diaper 1 according to the first embodiment includes a liquid-permeable top sheet 32, a liquid-impermeable or water-repellent back sheet 33, and both sheets 32 and 33, as shown in FIGS. A substantially vertically long absorbent main body 3 having a liquid-retaining absorbent core 34 interposed between and the outer packaging material 2 joined to the back sheet 33 side (non-skin contact surface side) of the absorbent main body 3. And. The absorptive main body 3 is disposed from the abdominal side A to the back side B of the outer packaging material 2, and the inner layer sheet of the outer packaging material 2 by the main body joint 15 by an adhesive, heat seal, ultrasonic seal or the like. 22 is joined.

  The outer wrapping material 2 has an hourglass shape in which both side edges are bound inward in the central portion in the longitudinal direction, and defines the outline of the diaper. The outer packaging material 2 is divided in the longitudinal direction into an abdominal side A disposed on the abdomen side of the wearer, a back side B disposed on the back side, and a crotch C positioned therebetween. The ventral side A and the back side B correspond to the longitudinal front and rear portions of the outer packaging material 2, respectively, and the crotch portion C corresponds to the longitudinal central portion of the outer packaging material 2. As for the outer packaging material 2, the both-sides edge part of the ventral | abdominal side part A and the both-sides edge part of the back side part B are mutually joined, and the waist opening part 12 and a pair of leg opening part 13 are formed in the disposable diaper 1. . By this joining, a pair of side seal parts 11 and 11 are formed on the left and right side edges of the disposable diaper 1 to form a pant-type. For this joining, heat sealing, high frequency sealing, ultrasonic sealing or the like is used.

  The top sheet 32, the back sheet 33, and the absorbent core 34 are each rectangular and integrated to form a vertically long absorbent main body 3. As the surface sheet 32, the back surface sheet 33, and the absorptive core 34, the thing similar to what was conventionally used for this kind of diaper can be used, respectively. For example, the absorbent core 34 may be made of superabsorbent polymer particles and fiber material and covered with tissue paper (not shown).

  As shown in FIG. 5, the absorbent core 34 in the present embodiment includes an hourglass-shaped central absorbent body 34 </ b> A and a pair of side absorbent bodies 34 </ b> B and 34 </ b> B provided symmetrically on both sides of the central absorbent body 34 </ b> A. It has. The central absorbent body 34A and the pair of side absorbent bodies 34B and 34B are separated from each other at least in the center in the longitudinal direction. One side in the longitudinal direction and the other side in the longitudinal direction of the side absorbent body 34B are connected to each other at one side in the longitudinal direction and the other side in the longitudinal direction of the central absorbent body 34A, respectively. Therefore, the cut-out portions 34C and 34C are formed between the central absorbent body 34A and the pair of side absorbent bodies 34B and 34B, respectively.

The one part in the longitudinal direction, the central part in the longitudinal direction, and the other part in the longitudinal direction are each region when the absorbent core 34 is divided into three regions so as to be divided into approximately three equal parts in the longitudinal direction.
When the absorbent core 34 has the separation portion 34 </ b> C, both side edges of the absorbent core 34 easily stand up. Further, when the absorbent core 34 is pressed in the width direction, the entire width of the absorbent core 34 is narrowed, so that the shrinkage in the width direction of the outer packaging material 2 is difficult to be inhibited.

  The shape of the absorbent core 34 in plan view is not limited to the shape shown in FIG. 5. For example, the side absorbent body 34 </ b> B is connected to the central absorbent body 34 </ b> A only in one of the longitudinal direction one part or the longitudinal direction other part. May be a shape in which the side absorber 34B is not connected (separated) to the central absorber 34A, or a shape that does not have the separation portion 34C (none of which is shown).

  As shown in FIGS. 2 to 4, side cuffs 35 and 35 made of a liquid-resistant or water-repellent and breathable material are provided on both sides in the longitudinal direction of the absorbent main body 3. In the vicinity of the free end of each side cuff 35, a side cuff elastic member 36 is disposed in an expanded state. Accordingly, when the disposable diaper 1 is worn, the side cuff elastic member 36 contracts, whereby the side cuff 35 stands up, and the outflow of the liquid in the width direction of the absorbent main body 3 is prevented. As shown in FIGS. 3 and 4, the side cuff forming sheet 37 for forming the side cuff 35 has a back surface sheet 33 with a portion 37 </ b> A having a predetermined width outside the width direction of the absorbent main body 3 in the diaper state. And is fixed between the absorbent core 34 and the back sheet 33.

  In the vicinity of both ends in the longitudinal direction on the inner surface side of the inner layer sheet 22, pressing sheets 27 for pressing both ends in the longitudinal direction of the absorbent main body 3 against the inner layer sheet 22 side of the outer packaging material 2 are joined. Therefore, as for the absorptive main body 3, the skin contact surface side in the longitudinal direction both ends is covered with the pressing sheet. In the pressing sheet, the portions overlapping the both ends in the longitudinal direction of the absorbent main body 3 are bonded via an adhesive (not shown) over substantially the entire width of the absorbent main body 3. Both ends in the longitudinal direction of 3 are fixed to the outer packaging material 2.

By covering both ends in the longitudinal direction of the absorbent main body 3 with the pressing sheet, it is possible to prevent the both ends in the longitudinal direction of the absorbent main body 3 from coming into direct contact with the wearer, and from the longitudinal ends of the absorbent main body 3. It is possible to prevent the water absorbent polymer in the absorbent core 34 from leaking.
In addition, it can replace with the said pressing sheet | seat by using the outer layer sheet | seat 21b longer than the inner layer sheet | seat 22, and folding up the part extended from the inner layer sheet | seat 22 in the outer layer sheet | seat 21b to the absorptive main body 3 side (FIG. Not shown).

2 and 3, the outer packaging material 2 includes an outer layer sheet 21b, an inner layer sheet 22, and a third sheet 21a between the outer layer sheet 21b and the inner layer sheet 22, and the inner layer sheet 22 and the third sheet 21a. Are provided with a plurality of elastic members 23, 24, 25, and 26. The outer layer sheet 21b forms the outer surface of the diaper, and the inner layer sheet 22 is arranged on the inner surface side of the outer layer sheet 21b.
The outer layer sheet 21b, the third sheet 21a, and the inner layer sheet 22 have the same shape, and the ends of the outer layer sheet 21b, the third sheet 21a, and the inner layer sheet 22 that form both ends in the longitudinal direction of the outer packaging material 2 are folded back. The cut ends of the outer layer sheet 21 b, the third sheet 21 a, and the inner layer sheet 22 are located at the longitudinal ends of the outer packaging material 2.

An adhesive Q such as a hot melt adhesive is applied to the inner surface of the third sheet 21a (the surface facing the inner layer sheet 22). The adhesive Q is applied to almost the entire region corresponding to the side seal portion 11, the region corresponding to the non-functionalized region 51 (described later) of the waistline elastic member 23, and the region corresponding to the leg elastic member cutting region 52 (described later). It is being crafted.
On the other hand, the adhesive Q is not applied to almost the entire region corresponding to the composite stretchable part 4 and almost the entire region corresponding to the crotch part C.

An adhesive Q such as a hot-melt adhesive is applied to the surface of the inner layer sheet 22 facing the third sheet 21a. The adhesive Q is applied to almost the entire region other than the region corresponding to the composite stretchable portion 4.
On the other hand, the adhesive Q is not applied to almost the entire region corresponding to the composite stretchable part 4 as in the case of the inner surface of the third sheet 21a.

  Thus, the coating shape of the adhesive Q on the surface of the inner layer sheet 22 facing the third sheet 21a includes the coating shape of the adhesive Q on the inner surface of the third sheet 21a. Therefore, when the third sheet 21a and the inner layer sheet 22 are pasted together, the adhesive Q applied to the inner surface of the third sheet 21a facing the third sheet 21a is also disposed on the inner surface of the third sheet 21a. Therefore, the adhesive Q is applied also to the inner surface of the third sheet 21a in the coating shape on the inner layer sheet 22 facing the third sheet 21a.

  In the disposable diaper 1 of this embodiment, as shown in FIG.3 and FIG.4, between the outer-layer sheet | seat 21b and the 3rd sheet | seat 21a in each of the ventral | abdominal side part A and the back | dorsal part B, and the 3rd sheet | seat 21a The inner layer sheet 22 is joined to each other by heat sealing, high frequency sealing, ultrasonic sealing or the like in the side seal portion 11.

  Further, waist gathers G <b> 2 are provided in the vicinity of the waist opening 12 in the ventral side A and the back side B of the outer packaging material 2. More specifically, a plurality of waist elastic members 24 are disposed along the peripheral edge of the waist opening 12 in each of the ventral side A and the back side B. A composite stretchable part 4 (details will be described later) is formed mainly of the outer layer sheet 21b, the third sheet 21a, the inner layer sheet 22 and the waist elastic member 24. By this composite stretchable part 4, the pair of side seal parts 11 is formed. The waist gather G2 is formed over the entire circumference (over the entire circumference of the waist opening 12).

The outer packaging material 2 is provided with a leg gather G3 along a pair of leg openings 13. More specifically, a plurality of leg elastic members 25 are arranged along each peripheral edge of the leg opening 13 curved in the crotch part C. The leg elastic member 25 is fixed in an extended state between the third sheet 21 a and the inner layer sheet 22 through the adhesive Q. Thereby, a leg gather G3 is formed along the leg opening 13.
In the present embodiment, the leg elastic member 25 includes a member disposed over the half of the peripheral edge of the leg opening 13 near the ventral side A and the back side in relation to the manufacturing method described later. By combining with a member arranged over half of the part B, it is arranged so as to extend over the entire peripheral edge of the leg opening 13, but depending on the manufacturing method, the leg elastic member 25 is One can be disposed over the entire periphery of the leg opening 13.

  In the waist part D (the region from the position spaced 20 mm downward from the peripheral edge of the waist opening 12 to the upper end of the leg opening 13) in the ventral side A and the back side B of the outer packaging material 2, a composite stretchable part A waistline gather G1 formed from No. 4 (details will be described later) is provided. Specifically, the waistline portion D is provided with a plurality of waistline elastic members 23 along the width direction. The waistline elastic member 23 extends between the vicinity of the side edge of the absorbent main body 3 and the side seal portion 11, and is not disposed between the vicinity of the side edge of the absorbent main body 3.

And the composite elastic part 4 is formed mainly by the outer layer sheet 21b, the third sheet 21a, the inner layer sheet 22, and the waistline elastic member 23, and by this composite elastic part 4, the vicinity of the side edge of the absorbent main body 3 and the side A pair of waistline gathers G <b> 1 arranged in the width direction across the seal portion 11 is formed in the width direction. The waistline gather G1 is not disposed between the side edge portions of the absorbent main body 3.
The “near side edge portion of the absorbent main body 3” means a region within 20 mm inward in the width direction and within 20 mm outward in the width direction from the side edge of the absorbent main body 3.

  A plurality of front crotch elastic members 26 are arranged over the entire width direction in the front crotch portion E (the most front region when the crotch portion C is divided into four in the longitudinal direction). The front crotch elastic member 26 is fixed in an extended state between the third sheet 21 a and the inner layer sheet 22 via the adhesive Q. Thus, a front crotch gather G4 is formed in the front crotch part E.

  A non-functionalized region 51 that prevents the elastic member from contracting is formed in a region of the outer packaging material 2 facing the absorbent main body 3. The non-functionalized region 51 in the present embodiment is formed without expressing the contraction force of the waistline elastic member 23 and the front crotch elastic member 26. As described in detail in the description of the manufacturing method described later, the non-functionalized region 51 is a continuous body 23S of the waistline elastic member 23 and the front crotch elasticity which are disposed across the entire width direction of the outer packaging material 2 in the raw material state. The continuous body 26S of the member 26 is a region formed without partially expressing the contraction force. In order to prevent the contraction force from appearing, for example, a large number of convex portions and cutter blades that divide the elastic member, a large number of emboss pins that harden the elastic member by heat sealing, and the like are used.

By forming the non-functionalized region 51, a pair of members separated in the width direction from the waistline elastic member continuous body 23S and the front crotch elastic member continuous body 26S disposed over the entire width direction of the outer packaging material 2 are formed. A waistline gather G1 and a front crotch gather G4 are formed.
The non-functionalized region 51 located between the pair of waistline gathers G1 in the width direction is formed without expressing contraction force on the waistline elastic member continuous body 23S not joined to the third sheet 21a and the inner layer sheet 22. On the other hand, the non-functionalized region 51 located between the pair of front crotch gathers G4 in the width direction is a front crotch elastic member continuous body 26S joined to the third sheet 21a and the inner layer sheet 22. Is formed without developing the contractile force.

A leg elastic member cutting region 52 is formed at a position that is the center of the crotch C in the width direction. The leg elastic member cutting region 52 is a continuous body 25S of leg elastic members 25 arranged in a curved shape in the entire width direction of the outer packaging material 2 in the raw material state, as will be described in detail in the description of the manufacturing method described later. Is a region cut at a position that is the central portion in the width direction of the crotch portion C. In order to form the leg elastic member cutting region 52, for example, a large number of convex portions and cutter blades that divide the elastic member are used.
By forming the leg elastic member cutting region 52, the leg elastic member continuous body 25 </ b> S disposed in a curved shape in the entire width direction of the outer packaging material 2, in the width direction center of the crotch C in the width direction. A pair of separated leg elastic members 25, 25 are formed.

In the present embodiment, the composite stretchable part 4 is not provided in the crotch part C of the outer packaging material 2.
As the leg elastic member 25 and the front crotch elastic member 26, elastic materials such as natural rubber, polyurethane resin, foamed urethane resin, and hot-melt elastic member are formed into a thread shape (thread rubber) or a belt shape (flat rubber), respectively. Those formed are preferably used.

Next, the composite elastic part 4 which forms the waistline gather G1 and the waist gather G2 in this embodiment is explained in full detail.
As shown in FIGS. 6 to 8, the composite stretchable portion 4 has an outer layer sheet 21 a and an inner layer sheet 22 dispersed in both the stretch direction (X direction) and the orthogonal direction (Y direction) of the composite stretchable portion 4. The multiple first joint portions 41a are joined together. In other words, the 1st junction part 41a is intermittently formed at intervals in both the X direction and the Y direction.
Further, in the composite stretchable part 4 of the present embodiment, in the first joint part 41a, the outer layer sheet 21b and the inner layer sheet 22 are joined with the third sheet 21a interposed between the two sheets 21b and 22. ing. Thus, the joining portion (first joining portion) 41a in which the outer layer sheet 21b and the inner layer sheet 22 are joined is not limited to the one in which the outer layer sheet 21b and the inner layer sheet 22 are in direct contact with each other, The outer layer sheet 21b and the inner layer sheet 22 may be a portion joined with another sheet such as the third sheet 21a interposed therebetween.

  Further, the second joining portion 41b in which the inner layer sheet 22 and the third sheet 21a are joined between the first joining portions 41a and 41a in the stretching direction (X direction) of the composite stretchable portion 4 is provided in the stretching direction. It is formed in a state dispersed in the orthogonal direction (Y direction). The second joint portion 41b has a space between the second joint portions 41b adjacent to each other in the Y direction, and also has a space between the adjacent first joint portions 41a and 41a in the X direction. is doing.

And the some elastic member 42 is distribute | arranged so that the 1st junction part 41a and the 2nd junction part 41b may not be passed.
The plurality of elastic members 42 are fixed to the outer layer sheet 21 b and the inner layer sheet 22 at both ends of the elastic member 42. The elastic member 42 is in a stretched state and is contracted after both ends thereof are fixed.
In a natural state (a state where no external force is applied), the elastic member 42 contracts, so that each of the outer layer sheet 21b, the third sheet 21a, and the inner layer sheet 22 continues over a plurality of elastic members 42. A plurality of eaves 43b, 43c, 43a are formed. More specifically, the third sheet 21a and the inner layer sheet 22 form ridges (small ridges 43a and 43c) smaller than the ridge 43b formed on the outer layer sheet 21b, respectively, and are formed on the inner layer sheet 22 by the outer layer sheet 21b. Larger ridges (large ridges 43b) than the formed ridges 43a are formed.

The composite stretchable part 4 in the diaper 1 of the present embodiment is different in the size of the collar 43b formed on the outer layer sheet 21b and the collar 43a formed on the inner layer sheet 22, so that the physical properties of the composite stretchable part 4 are more than the elastic member. It can be made different between the outer layer sheet 21b side and the inner layer sheet 22 side, and a high-quality diaper utilizing each physical property can be obtained.
In particular, even if the ridge 43b formed on the outer layer sheet 21b is larger than the ridge 43a formed on the inner layer sheet 22, and the composite stretchable portion 4 is pressed against the wearer's skin by the contraction of the elastic member 42, the inner layer Since the wrinkle 43a of the sheet 22 is not easily crushed or is excellent in recoverability even when crushed, good air permeability is obtained between the skin, while the wrinkle 43b of the outer layer sheet 2 is large and easily recognizable visually. The outer appearance of the diaper having an elastic stretchable part in which a plurality of large wrinkles extending in one direction appears is excellent.

As long as the disposable diaper as an absorbent article does not completely crush the gavel 43a, it is possible to increase the strength of the girth gather G1, and to ensure good air permeability, It can also be prevented more effectively.
Moreover, the elastic expansion-contraction part 4 in this embodiment is the 2nd junction in which the inner layer sheet 22 and the 3rd sheet | seat 21a are joined between the 1st junction parts 41a and 41a in the X direction, and the outer layer sheet | seat 21b is not joined. Since it has the part 41b, formation of the small ridge 43a by the inner layer sheet | seat 22 is easy, and the stability of the ridge 43a and the recoverability with respect to a compressive deformation are improving. This makes it easier to achieve both good air permeability and good appearance, and good air permeability and good slippage prevention.

Moreover, in the elastic expansion-contraction part 4 of this embodiment, the small collar 43c formed of the 3rd sheet | seat 21a is formed inside the large collar 43b formed of the outer layer sheet | seat 21b. With this configuration, the position of the large collar 43b is difficult to move in the composite stretchable part 4. As a result, the shape of the heel is stable and the appearance can be maintained beautifully.
The outer layer sheet 21b is not bonded to the second bonding portion 41b. In other words, the first joining portion 41a in which the outer layer sheet 21b and the inner layer sheet 22 are joined and the second joining portion 41b in which the outer layer sheet 21b and the inner layer sheet 22 are not joined are the stretching direction of the composite stretchable portion 4. The smells are alternately arranged.

  In the present invention, at least the waistline gather G1 is preferably formed from the composite stretchable part 4, but other gathers may be formed from the composite stretchable part 4. For example, in the first embodiment, the waist gather G2 is also formed from the composite stretchable part 4. The waistline gather G1 formed from the composite stretchable part 4 is composed mainly of the outer layer sheet 21b, the third sheet 21a, the inner layer sheet 22 and the waistline elastic member 23, and the waist gather G2 formed from the composite stretchable part 4 is The outer layer sheet 2121b, the third sheet 21a, the inner layer sheet 22, and the waist elastic member 24 are mainly configured. Thus, although the elastic member which comprises it changes with gathers, in the following description of the composite expansion-contraction part 4, the elastic member which comprises the composite expansion-contraction part 4 is demonstrated as the "elastic member 42". In the following description of the composite stretchable part 4, both the “first joint part 41a” and the “second joint part 41b” are collectively referred to as “joint part 41”. In addition, “襞 43” is used to describe items common to “襞 43a”, “襞 43b”, and “襞 43c”.

  In the composite stretchable part 4, it is preferable that all the elastic members 42 are configured not to pass all the joints 41 (including the first joint 41a and the second joint 41b). Due to errors, some elastic members 42 may pass through some of the joints 41. Even if some elastic members 42 pass through some of the joint portions 41, the effects of the present invention are sufficiently achieved. Therefore, when the elastic member 42 does not pass through 80% (pieces / pieces) or more of the joint portions 41 provided in the composite stretchable portion 4, the elastic member 42 does not pass through the joint portion 41. It shall be comprised as follows.

As shown in FIGS. 6 and 7, the outer layer sheet 21b, the third sheet 21a, and the inner layer sheet 22 constituting the composite stretchable part 4 are composed of the stretchable direction (X direction) of the composite stretchable part 4 and the direction (Y direction) perpendicular thereto. ) In each case, the joint portions 41 are intermittently joined.
The inner layer sheet 22 and the third sheet 21a are joined to each other by an intermittent second joining part 41b in the stretching direction of the composite stretchable part and the direction orthogonal thereto. The outer layer sheet 21b and the third sheet 21a are joined to each other at the intermittent first joining part 41a in the stretching direction of the composite stretchable part and the direction orthogonal thereto. In the present embodiment, at the first joint portion 41a, the outer layer sheet 21b and the inner layer sheet 22 are joined in a state in which the third sheet 21a is sandwiched between the two sheets 21b and 22.

  The joint portion 41 is preferably formed by heat sealing. As a method of forming the first joint portion 41a, in a state where the third sheet 21a is disposed between the outer layer sheet 21b and the inner layer sheet 22, they are integrally pressed and heated (for example, heat sealing). Or a method in which the inner layer sheet 22 and the third sheet 21a are bonded by heat sealing or the like, and then an adhesive is applied to a position overlapping the bonded portion, and the outer layer sheet 21b is bonded through the adhesive. In addition, after the outer layer sheet 21b and the third sheet 21a are joined by heat sealing or the like, an adhesive is applied to a position overlapping the joining portion, and the inner layer sheet 22 is joined via the adhesive. .

  The plurality of elastic members 42 are arranged in parallel to each other, and are arranged so as to extend along the longitudinal direction of the composite stretchable part 4. When a plurality of elastic members 42 are arranged in parallel to each other as in the present embodiment, the expansion / contraction direction of the composite expansion / contraction part 4 is the same direction as the direction in which the elastic member 42 extends. When the plurality of elastic members 42 are not arranged in parallel to each other, the expansion / contraction direction of the composite expansion / contraction part 4 is orthogonal to the direction in which the flanges of the flanges 43a and 43b extending over the plurality of elastic members 42 extend. The direction.

FIG. 7 is a diagram illustrating an arrangement pattern of the joint portions 41. The joint portions 41 are formed so as to form rows in the stretching direction (X direction) of the composite stretchable portion 4 and the direction (Y direction) perpendicular thereto, and the joint portions 41 constituting the row in the perpendicular direction are formed. It is formed between each elastic member 42. In the example shown in FIG. 7, the first joint portion 41a and the second joint portion 41b have substantially the same plan view shape and the same pitch in the Y direction.
Then, as described above, due to the contraction of the elastic member 42, the inner layer sheet 22, the third sheet 21a, and the outer layer sheet 21b are deformed to form the flanges 43, respectively, but as shown in FIG. One of the flanges 43a and 43c formed by the sheet 22 and the third sheet 21a is formed between the joint portions 41 adjacent to each other in the expansion / contraction direction (X direction) of the composite expansion / contraction portion 4, and the sizes thereof are compared. On the other hand, the ridge 43b formed by the outer layer sheet 21b is formed one for the two joint portions 41 in the expansion / contraction direction (X direction) of the composite expansion / contraction portion 4, and the size thereof is 襞 43a. , 43c.

  From the viewpoint of reliably forming the flanges 43 extending continuously over the plurality of elastic members 42, the pitch P <b> 2 of the joint portions 41 in the expansion / contraction direction (X direction) of the composite expansion / contraction portion 4 when the composite expansion / contraction portion 4 extends. (See FIG. 7) is preferably 1 to 20 mm, particularly 3 to 10 mm, and the length L2 (see FIG. 7) of each joint 41 is 0.1 to 5 mm, particularly 0.2 to 1.5 mm. It is preferable that The ratio (P2 / L2) between the pitch P2 and the length L2 is preferably 1.1 to 200, particularly 2 to 50.

  In the composite stretchable part 4, the pitch P3 (see FIG. 7) of the joint part 41 in the direction (Y direction) orthogonal to the stretch direction is preferably 1 to 40 mm, particularly 2 to 15 mm. The length L3 (see FIG. 7) is preferably 0.5 to 20 mm, particularly 1 to 10 mm. Moreover, it is preferable that ratio (P3 / L3) of the said pitch P3 and the said length L3 is 1.05-80, especially 1.05-15.

In the composite stretchable part 4, it is preferable that the outer layer sheet 21 b, the third sheet 21 a, and the inner layer sheet 22 are not joined to each other at a part other than the joint part 41. Each elastic member 42 does not pass through the first joint portion 41a where the outer layer sheet 21b and the inner layer sheet 22 are joined and the second joint portion 41b where the third sheet 21a and the inner layer sheet 22 are joined. It is arranged in the composite stretchable part 4 and is fixed between the outer layer sheet 21 b and the inner layer sheet 22 only at both ends of the elastic member 42.
In the aspect in which the elastic member 42 is fixed between the outer layer sheet 21b and the inner layer sheet 22, both end portions of the elastic member 42 are directly coupled to the third sheet 21a and the inner layer sheet 22 respectively. When there is a joint between the third sheet 21a and the outer layer sheet 21b at the overlapping position, or both ends of the elastic member 42 are directly coupled to either the third sheet 21a or the inner layer sheet 22, and the coupling The case where the portion overlaps the joint portion between the third sheet 21a and the outer layer sheet 21b is also included.

  In the present embodiment, both end portions of the elastic member 42 are arranged between the third sheet 21a and the inner layer sheet in a state sandwiched between the third sheet 21a and the inner layer sheet 22 at both end portions 44 (only one is shown) of the composite stretchable portion 4. 22 is fixed. Both end portions 44 of the composite stretchable portion 4 differ depending on the gathers formed thereby. In 1st Embodiment, the both ends 44 of the composite expansion-contraction part 4 which forms the waistline gather G1 are the side edge part vicinity and the side seal part 11 of the absorptive main body 3, and the composite expansion-contraction part 4 which forms waist gathers G2 Both end portions 44 are both side seal portions 11, 11. In addition, you may form the both ends 44 of the composite expansion-contraction part 4 so that expansion-contraction is possible.

The flanges 43b, 43c, 43a in the outer layer sheet 21b, the third sheet 21a, and the inner layer sheet 22 are formed so as to protrude on any surface of the composite stretchable part 4. Specifically, the heel 43a formed by the inner layer sheet 22, as shown in FIG. 8 (b), is formed so as to protrude on the surface facing the wearer's skin side, and the third sheet 21a and the outer layer sheet The heels 43c and 43b formed by 21b are formed so as to protrude from the surface opposite to the surface facing the wearer's skin (usually the surface facing the inner surface of clothing such as shorts when worn). Has been.
A convex curved surface having a circular arc shape in cross section is formed at the tip of each flange 43 in the protruding direction. The convex curved surface continuously extends in a direction (Y direction) orthogonal to the expansion / contraction direction of the composite expansion / contraction part 4. In the present embodiment, one flange 43a, 43c is formed between the first joint 41a and the second joint 41b adjacent to each other in the stretch direction (X direction) of the composite stretch portion 4. Each of the flanges 43b is formed between the first joint portion 41a and the first joint portion 41a. These flanges 43 are continuously divided in a direction (Y direction) perpendicular to the expansion / contraction direction of the composite expansion / contraction part 4 without being divided at a portion overlapping the elastic member 42.

  In the composite stretchable part 4 in the present embodiment, each of a large number of ridges 43 (particularly 43b) formed by contraction of the elastic member 42 is continuously in a direction (Y direction) orthogonal to the stretchable direction of the composite stretchable part 4. Because it extends, it looks very beautiful.

Moreover, the composite elastic part 4 in this embodiment can prevent the increase in rigidity, and the degree of freedom of deformation of the flange 43 with respect to external force is improved. The increase in rigidity and the improvement in the degree of freedom of deformation of the flange 43 are caused by the elastic member 42 having a valley between the flange 43b and the flange 43b in the outer layer sheet 21b (or between the flange 43a and the flange 43a in the third sheet 21a). The outer layer sheet, including a portion sandwiched between the valleys between the valleys of the inner layer sheet 22 and the valleys between the flanges 43a and 43a of the inner layer sheet 22. 21b, the third sheet 21a and the inner layer sheet 22 are not joined to each other, and the outer layer sheet 21b, the third sheet 21a and the inner layer sheet 22 in the composite stretchable part 4 are stretched in the composite stretchable part 4. This is based on the fact that they are not continuously joined in either the (X direction) or the direction (Y direction) perpendicular thereto.
Furthermore, due to a synergistic effect with the tip of the ridge 43 forming a convex curved surface, a volume appears in the thickness direction of the outer layer sheet 21b and the inner layer sheet 22, and the touch when the surface of the composite stretchable part 4 is touched. It is very soft and feels very good.

  Moreover, since the elastic member 42 in the composite stretchable part 4 is present in a state where it is not joined to the outer layer sheet 21b, the third sheet 21a, and the inner layer sheet 22, the amount of hot melt adhesive used is suppressed to zero or a small amount. be able to. In particular, when the first joint portion 41a and the second joint portion 41b are formed by heat fusion, the effect of reducing the amount of adhesive used is even more remarkable. Since the amount of hot-melt adhesive used is small, air permeability and moisture permeability are not impaired.

The material for forming the composite stretchable part 4 in this embodiment will be described.
The outer layer sheet 21b, the third sheet 21a, and the inner layer sheet 22 are air-through nonwoven fabric, heat roll nonwoven fabric, and spun lace nonwoven fabric from the viewpoint of forming beautiful small and comfortable small knives 43a, 43c and large ridges 43b. Spunbond nonwoven fabric, melt blown nonwoven fabric and the like are preferable.

  In the composite stretchable part 4, the outer layer sheet 21b, the third sheet 21a, and the inner layer sheet 22 are deformed by the contraction of the elastic member 42 to form the small ridges 43a, 43c and the large ridge 43b. That is, the rigidity of the outer layer sheet 21b, the third sheet 21a, and the inner layer sheet 22 is one of the factors that determine the moldability and cushioning properties of the small ridges 43a, 43c and the large ridge 43b of the composite stretchable portion 4. The rigidity of each sheet can be expressed by its buckling strength. The buckling strength of the sheet used for the composite stretchable part 4 is preferably 100 cN or less, particularly preferably 70 cN or less. Here, the buckling strength is measured by a compression test mode of a Tensilon universal testing device (manufactured by Orientec Co., Ltd.) as shown below.

Buckling strength test method (CD):
A rectangular test piece having a length of 150 mm in the machine flow direction (MD) and a length of 30 mm in the direction orthogonal to the machine flow direction (CD) is rounded to create a cylinder having a diameter of 45 mm. The lower end is stopped with a stapler or the like to obtain a measurement sample. This is measured in the measurement environment of 20 ° C. and 65% RH under the measurement conditions of a compression speed of 10 mm / min and a measurement distance of 20 mm by the compression test mode of the Tensilon universal testing device. The maximum strength when the measurement sample is compressed by 20 mm is measured for each measurement sample, the average value is obtained, and this is taken as the buckling strength.
As described above, non-woven cloth is preferably used as the outer layer sheet 21b, the third sheet 21a, and the inner layer sheet 22. The basis weight of the nonwoven fabric is preferably 5 to 50 g / m ² , particularly preferably 18 to 30 g / m ² . The buckling strength of the nonwoven fabric having such a basis weight is preferably 50 cN or less, particularly preferably 30 cN or less in the CD direction, and preferably 70 cN or less, particularly preferably 50 cN or less in the MD direction.

In addition, the outer layer sheet 21b, the third sheet 21a, and the inner layer sheet 22 are formed from a heat-fusible material (a fiber in the case of a nonwoven fabric) from the viewpoint of facilitating bonding by heat fusion (formation of the bonding portion 41). It is preferable to consist of these resin. Examples of the heat-fusible resin include polyethylene and polypropylene. The fiber may be a core-sheath type composite fiber whose sheath is made of a heat-fusible resin.
The outer layer sheet 21b, the third sheet 21a, and the inner layer sheet 22 may be formed of the same or different materials.

  The third sheet 21a and the inner layer sheet 22 in the present invention are not limited to two separate sheets, but are formed by bending one sheet to form two opposed surfaces and constituting one surface. The third sheet 21a and the portion constituting the other surface can be used as the inner layer sheet 22.

  As a material for forming the elastic member 42 in the composite stretchable part 4, various known elastic materials used for absorbent articles such as disposable diapers and sanitary napkins can be used without particular limitation. Examples of the elastic material include synthetic rubber such as styrene-butadiene, butadiene, isoprene, and neoprene, natural rubber, EVA, stretchable polyolefin, and polyurethane. As the form of the elastic member 42, a cross-sectionally rectangular, square, circular, polygonal or other thread-like or string-like (flat rubber etc.) or multifilament-type thread-like one can be used.

  Another factor that determines the formability of the collar 43 of the composite stretchable part 4 is the stretch ratio and stretch stress of the elastic member 42. In order to make the cross-sectional shape of the flange 43 convex, the required expansion ratio and expansion / contraction stress of the elastic member 42 are required. The elastic member 42 is preferably bonded to the outer layer sheet 21 and the inner layer sheet 22 in a stretched state of 20 to 1000%, particularly preferably 50 to 400%. Then, the elastic member 42 contracts, and the contracted portions of the outer layer sheet 21b, the third sheet 21a, and the inner layer sheet 22 are left, and the remaining outer layer sheet 21b, the third sheet 21a, and the inner layer sheet 22 are bonded to the bonding portion 41. By deforming into a convex cross section in the direction opposite to the surface (outside), the flange 43 is formed.

  As described above, the height of the flange 43 is an important element related to the moldability and cushioning properties, and the arrangement pattern and interval of the joint portions 41, the material of the outer layer sheet 21b, the third sheet 21a and the inner layer sheet 22, and It can be arbitrarily designed by selecting an elastic member or the like. The height of the flange 43 is preferably about 1 to 15 mm on one side. In order to increase the height of the flange 43, the elastic member 42 is contracted to the extent that the interval between the first and second joint portions 41a and 41b adjacent to each other is reduced, thereby forming the convex flange 43. A soft composite stretchable part 4 can be formed. When forming the small collar 43a (or large collar 43b) whose height on one side is h1 (height is h2), the interval between the first joint portions 41a (or the second joint portions 41b) is at least 2 × h1 (or 2 × h2), and when the distance between the joint portions 41a is 2 × h1 (or 2 × h2), the elastic member 42 is adjacent to the first joint portions 41a (second joint portions). 41b) needs to shrink to the extent that it is adjacent.

One of the preferable elastic members 42 is natural rubber (or synthetic rubber). Examples of natural rubber (synthetic rubber) include low modulus elastic members having a thickness of 0.05 to 1.5 mm and a width of 0.2 to 5 mm. In this elastic member, the stress at 100% elongation with a single yarn is preferably 1 to 70 gf, more preferably 1 to 40 gf, and particularly preferably 1 to 30 gf. By providing a plurality of single yarns of the elastic member having a low modulus at a high elongation ratio of preferably 100% or more, particularly preferably 200% or more, a composite stretchable part 4 having a beautiful heel 43 that stretches softly is obtained. Can do.
Other preferred elastic members include polyurethane spandex elastic fibers. As the elastic fiber, one having a single yarn size of 10 to 3360 denier, particularly preferably 70 to 1120 denier is used. Denier is a unit representing the thickness of a yarn, and a yarn of 1 g at 9000 m is called 1 denier. It is preferable to use the spandex elastic fiber by stretching it to 30 to 500%.

According to the pants-type disposable diaper of the present embodiment having the above-described configuration, the waistline gather G1 and the waist gather G2 are formed from the composite stretchable part 4, and the gather can be obtained without substantially using the hot melt adhesive. Therefore, the air permeability in the ventral side A and the back side B is excellent. Moreover, the original material texture of the outer layer sheet 21b, the third sheet 21a, and the inner layer sheet 22 of the outer packaging material 2 can be utilized, and it is soft and not stiff.
In the composite stretchable portion 4, the contraction force of the elastic member 42 is not (or hardly) inhibited, so that the contraction force is utilized to the maximum extent. Therefore, since the shrinkage force is high, it fits gently to the wearer and is difficult to slip off. Moreover, since the whole diaper shrinks to the maximum extent, there is an advantage that it looks compact. For the same reason, the size application range of the wearer is increased. Moreover, since the usage-amount of the elastic member 42 can be reduced, it is advantageous also in terms of cost.
Since the heel 43 is formed on the outer surface of the composite stretchable portion 4 and the heel 43 is a contact surface with the wearer, the composite stretchable portion 4 has a high cushioning property when worn and fits gently to the wearer's skin. Less damage. Moreover, since the collar 43 is also arranged on the outer surface of the outer packaging material 2 (the outer surface when worn), the outer surface feels excellent.

  Next, the manufacturing method of the underpants type disposable diaper of this invention is demonstrated based on the preferable one embodiment. The manufacturing method of this embodiment is a method of continuously producing the pants-type disposable diaper 1 of the above embodiment. FIG. 9 is a perspective view showing the entire contents of an embodiment of the method for producing a pants-type disposable diaper of the present invention. FIG. 10 is a conceptual diagram showing mainly the steps of forming the composite stretchable part, the non-functionalized region, and the leg elastic member cutting region in the manufacturing method of the present embodiment. FIG. 11 is a conceptual diagram showing mainly the process of forming the composite stretchable part in the manufacturing method of the present embodiment.

The manufacturing method of the underpants type disposable diaper of this embodiment joins the continuous body 21Sa of the 3rd sheet | seat 21a, and the continuous body 22S of the inner-layer sheet | seat 22 by the 2nd junction part 41b, as shown in FIGS. The step of forming the intermediate stretchable part 4b and the continuous body 21Sb of the outer layer sheet 21b are laminated on the third sheet 21a side in the intermediate stretchable part 4b, and these continuous bodies 21Sa, 22S and 21Sb are joined by the first joint part 41a. A step of forming the composite stretchable part 4 by bonding.
As shown in FIG. 9, in the manufacturing method of this embodiment, a continuous body 21Sa of the third sheet 21a and a continuous body 22S of the inner layer sheet 22 are interposed between the continuous bodies 23S of the elastic members 23, 24, 25, and 26. , 24S, 25S, and 26S, and further, the continuous body 21Sb of the outer layer sheet 21b is laminated to form the continuous body 2S of the outer packaging material 2, and then the inner layer sheet continuous body 22S side of the outer packaging material continuous body 2S is formed. Production of a pants-type disposable diaper in which the absorbent main body 3 is joined by a body joint 15 (see FIG. 4) to form a diaper continuous body 1S, and then the diaper continuous body 1S is divided to form individual diapers 1 Is the method.

The manufacturing method of this embodiment will be described in detail. The outer layer sheet continuous body 21Sb is used as the original sheet of the outer layer sheet 21b, the inner layer sheet continuous body 22S is used as the original sheet of the inner layer sheet 22, and the third sheet continuous body 21Sa is used as the original sheet of the third sheet 21a.
Each continuous body 23S, 24S, 25S, 26S of each elastic member 23, 24, 25, 26 is introduced between the third sheet continuous body 21Sa and the inner layer continuous sheet body 22S in an expanded state. In addition, in FIG. 10, illustration of the continuous body 26S of the front crotch elastic member 26 is abbreviate | omitted. Before the third sheet continuous body 21Sa and the inner layer sheet continuous body 22S merge, the hot melt type adhesive Q is applied to the respective facing surfaces by an adhesive coating device 64 (see FIG. 10) or the like. The Further, the continuum 25S of the leg elastic member 25 is swung along the shape of the leg opening 12 by the swing guide 65 (see FIG. 10), while the third sheet continuum 21Sa and the inner layer sheet continuum 22S. Introduced between.

The third sheet continuous body 21Sa and the inner layer sheet continuous body 22S are narrowed between the pair of nip rolls 61 and 61 with the elastic member continuous bodies 23S, 24S, 25S, and 26S sandwiched therebetween. As a result, an intermediate laminated body 2Sa is obtained in which the elastic member continuous bodies 23S, 24S, 25S, and 26S are sandwiched and joined between the two sheet continuous bodies 21Sa and 22S. Here, the waistline elastic member 23 is not joined by the hot-melt adhesive Q in a region between the side edge portion of the absorbent main body 3 and the side seal portion 11. Similarly, the waist elastic member 24 is not joined by the hot melt adhesive Q in a region between the pair of side seal portions 11.
At this time, the composite stretchable portion 4, the non-functionalized region 51, and the leg elastic member cutting region 52 are not formed in the intermediate laminate 2Sa.

  Next, the intermediate laminate 2Sa is introduced between the upstream uneven roll 62 and the anvil roll 63. The upstream uneven roll 62 includes, on its peripheral surface, the second bonding portion forming portion 62A that forms the second bonding portion 41b described above, and a non-functionalized region forming portion 62B and a leg that form the nonfunctionalized region 51. A leg elastic member cutting region forming part 62 </ b> C for forming the elastic member cutting region 52 is provided. The anvil roll 63 is a receiving roll for the upstream uneven roll 62, and its peripheral surface is a smooth surface.

  A number of embossed pins 62D (see FIG. 11) are provided in the second bonding portion forming portion 62A of the upstream uneven roll 62 corresponding to the second bonding portion 41b of the composite telescopic portion 4, and the second bonding portion. According to the formation part 62A, the 2nd junction part 41b can be formed in the area | region corresponding to the composite expansion-contraction part 4 in intermediate | middle laminated body 2Sa. The emboss spin 62D may be a heat emboss spin or an ultrasonic emboss spin. FIG. 11 is a conceptual diagram showing only elements closely related to the process of forming the composite stretchable part 4. Therefore, for example, only the second joint forming part 62A is illustrated on the peripheral surface of the upstream uneven roll 62, and only the composite stretchable part 4 is illustrated for the outer packaging material continuous body 2S.

  The non-functionalized region forming part 62B of the upstream uneven roll 62 is a part that prevents the elastic member from contracting, and can form the non-functionalized region 51 in the outer packaging material continuous body 2S. The non-functionalized region forming part 62B is composed of a large number of convex portions and cutter blades that divide the elastic member, and a large number of emboss pins that harden the elastic member by heat sealing.

  The leg elastic member cutting region forming portion 62C of the upstream uneven roll 62 is a portion that cuts the leg elastic member continuous body 25S located at the center of the crotch portion C in the width direction, and forms the leg elastic member cutting region 52. can do. The leg elastic member cutting region forming part 62C is composed of, for example, a large number of convex parts and cutter blades. According to the leg elastic member cutting region forming portion 62C, the leg elastic members 25, 25 separated in the width direction at the center in the width direction of the crotch C can be obtained by cutting the leg elastic member continuous body 25S.

  Next, the outer layer continuous sheet 21Sb is laminated on the surface of the intermediate laminated body 2Sa on which the second joint portion 41b is formed on the third sheet continuous body 21Sa side, and these are a pair of second nip rolls 61 ′, 61. After being 'passed through,' it is introduced between the downstream uneven roll 62 'and the anvil roll 63'. The downstream uneven roll 62 'includes a first joint forming portion 62A' that forms the first joint 41a described above on the circumferential surface thereof. The anvil roll 63 'is a receiving roll for the downstream side uneven roll 62', and its peripheral surface is a smooth surface.

  A plurality of embossed pins 62D ′ (see FIG. 11) are provided in the first joint forming part 62A ′ of the downstream uneven roll 62 ′ corresponding to the first joint 41a of the composite stretchable part 4. According to 1 junction part formation part 62A ', the 1st junction part 41a can be formed in the area | region corresponding to the composite expansion-contraction part 4 in intermediate | middle laminated body 2Sa. The embossed spin 62D 'may be a heat embossed spin or an ultrasonic embossed spin. The embossed spin 62D of the upstream uneven roll 62 and the embossed spin 62D ′ of the downstream uneven roll 62 ′ are arranged at the same interval in the circumferential direction of each roll, and the second bonding is performed in the flow direction of the intermediate laminate 2Sa. The part 41b or the first joint part 41a can be formed at the same pitch. However, the second junction 41b formed by the embossed spin 62D and the first junction 41a formed by the embossed spin 62D ′ have the formation positions in the flow direction of the intermediate stacked body 2Sa, The first joint portions 41b are shifted by a half pitch, and the second joint portions 41b and the first joint portions 41a are alternately formed at a constant pitch in the outer packaging material continuum 2S or the elastic stretchable portion 4.

  As described above, the intermediate laminate 2Sa is passed between the upstream uneven roll 62 and the anvil roll 63, and then passed between the downstream uneven roll 62 'and the anvil roll 63', so that the composite expansion and contraction is achieved. The outer packaging material continuum 2S in which the portion 4, the non-functionalized region 51, and the leg elastic member cutting region 52 are formed is obtained.

The pants-type disposable diaper 1 of the above embodiment uses the outer packaging material continuum 2S in which the composite stretchable part 4, the non-functionalized region 51, and the leg elastic member cutting region 52 are formed. It can manufacture by performing similarly to each process in the manufacturing method of what is called a cross-flow type underpants type disposable diaper.
For example, as shown in FIG. 9, the absorbent main body 3 obtained by cutting the absorbent main body continuous body 3 </ b> S on the outer packaging material continuous body 2 </ b> S is rotated 90 degrees with respect to the flow direction. The parts 15 (see FIG. 4) are joined and fixed intermittently. The absorbent main body 3 is fixed to the outer packaging material continuum 2S while maintaining the extended state of the outer packaging material continuum 2S. In other words, the absorbent main body 3 is fixed while maintaining the outer wrapping material continuous body 2 </ b> S so as not to shrink due to the shrinkage force of the composite stretchable part 4 or the like.

Next, the continuum 27S of the pressing sheet 27 is covered with both sides of the outer wrapping material continuum 2S in the diaper continuum 1S so as to cover both ends of the absorbent main body 3 in the longitudinal direction (the both ends in the longitudinal direction of the outer wrapping material 2). To join). Adhesive is applied in advance to predetermined positions of the inner surface side of the pressing sheet continuous body 27S, the inner layer continuous sheet 22S, the absorbent main body 3 and the like facing the inner surface side.
Moreover, as shown in FIG.9 and FIG.10, the trim 13S for leg opening part formation is removed from the outer packaging material continuous body 2S with a rotary cutter, a laser cutter, etc., and the diaper continuous body 1S is obtained.
Then, the diaper continuous body 1S is folded back in the width direction (longitudinal direction of the disposable diaper 1) and folded in two. Next, after forming the side seal portions 11 and 11 by heat sealing, ultrasonic sealing, high frequency sealing or the like, or simultaneously with the formation of the side seal portions 11 and 11, the side seal portions 11 and 11 are divided into individual diapers. A pants-type disposable diaper 1 can be obtained.

  As shown in FIG. 7, the elastic member 42 (corresponding to the waistline elastic member 23 and the waist elastic member 24 in the present embodiment) in the disposable diaper 1 contracts, whereby the inner layer sheet 22 and the Each of the three sheets 21b forms a plurality of small baskets 43a and 43c, and each of the outer layer sheets 21b forms a plurality of large bowls 43b. And the waist circumference gather G1 and the waist gather G2 are formed by the elastic expansion-contraction part 4 which has such a collar 43. FIG.

  As a method of intermittently fixing the absorbent main body 3 by 90 degrees and intermittently fixing it on the outer packaging material continuous body 2S, for example, a method described in JP-A-6-296638 can be used. Further, the main body joint 15 (see FIG. 4) for fixing the absorbent main body 3 to the outer packaging material continuum 2S may be applied to one or both of the absorbent main body 3 and the outer packaging material continuum 2S. it can. The trim 13S for forming the leg opening can be removed before the absorbent main body 3 is fixed to the outer packaging material continuous body 2S.

  Next, other embodiment of the underpants type disposable diaper of this invention is described. In the other embodiments, differences from the first embodiment described above will be mainly described, and the same points are denoted by the same reference numerals and description thereof will be omitted. For the points that are not particularly described, the description of the first embodiment is applied as appropriate. In other embodiments, the same effects as those of the first embodiment can be obtained.

In the underpants type disposable diaper of 2nd Embodiment, the structure of the composite expansion-contraction part 4 differs from 1st Embodiment.
As for the composite expansion-contraction part 4 in 2nd Embodiment, the 1st junction part 41a and the 2nd junction part 41b are arranged in zigzag form as a whole (not shown). That is, the joint portion includes a joint row in which a plurality of first joint portions 41a are arranged in series in a direction orthogonal to the stretch direction of the composite stretch portion 4 (Y direction) and a joint portion row of the second joint portions 41b adjacent thereto. The arrangement pattern 41 can be shifted by a half pitch (P1 / 2). More specifically, the joint portion 41 is formed so as to form a line (form a seal line) in the expansion / contraction direction (X direction) of the composite expansion / contraction portion 4 and the direction orthogonal to the expansion direction (Y direction). One joining portion 41 forming a row in the direction (Y direction) is formed for every two elastic members.
A region where the joint portion 41 does not exist is continuously formed between both end portions 44 of the composite stretchable portion 4 between the stretchable direction (X direction) row of the composite stretchable portion 4 and the row adjacent thereto. The elastic member 42 is arranged in a non-bonded state in the region. As a result, two ridges 43 are formed between the joint portions 41 and 41 adjacent to each other in the stretching direction (X direction) of the composite stretchable portion 4.

As mentioned above, although this invention was demonstrated based on the preferable embodiment or embodiment, this invention is not restrict | limited to the said embodiment or embodiment. For example, the configuration of the composite stretchable portion 4 is not limited to the configuration of the composite stretchable portion 4 shown in FIGS. 6 and 7. Further, the present invention is not limited to that of the second embodiment.
For example, the composite stretchable part 4 can be applied to gathers other than the waistline gather G1 and the waist gather G2.
The composite stretchable part 4 that forms the waistline gather G1 may be provided only in a region outward in the width direction from the absorbent main body 3.
In the pants-type disposable diaper of the embodiment, the outer packaging material 2 is formed of a laminated body of the same outer layer sheet 21b, the third sheet 21a, and the inner layer sheet 22, but the outer packaging material 2 has the same shape as the outer packaging material 2. The third sheet 21a may be formed of a laminate of the inner layer sheet 22 having a separated shape (not shown) that exists only in the abdominal part A and the back part B and does not exist in the crotch part C. In the outer packaging material 2 having this configuration, the crotch part C is formed of the outer layer sheet 21b and the third sheet 21a.

  The flange 43 in the composite stretchable part 4 in the above embodiment is continuous across the two elastic members 42 located at both ends in the direction (Y direction) orthogonal to the stretchable direction of the composite stretchable part 4. The elastic member 42 located in the vicinity of the end in the Y direction of the stretchable part 4 may exist in a state where it is joined to the third sheet 21 a and the inner layer sheet 22. However, it is preferable that the flange 43 is continuous over at least three, preferably half, particularly preferably 70% or more, of the total number of the elastic members 42. Moreover, the edge part of the elastic member 42 joined to both sheets 21a and 22 may exist inside the edge part 44 of the expansion-contraction direction (X direction) of the composite expansion-contraction part 4. FIG.

  In the above-described embodiment, the ratio of two small chess is formed for one large ridge. However, one small ridge may be formed for one large ridge. Three or more (for example, 3 to 10) small cages may be formed for one cage.

Although the number of the elastic members 42 in the composite stretchable part 4 can be appropriately determined according to the size and use of the composite stretchable part 4, it can be set to 5 to 30, for example. Further, the joining portion 41 can be formed by joining with an adhesive such as ultrasonic joining or hot-melt adhesive other than heat fusion.
Further, the arrangement pattern of the joint portions 41 can be changed as appropriate. The shape of the joint portion 41 can be an appropriate shape such as a rectangular shape, an oval shape, a circular shape, or a rhombus shape.

The absorbent article of the present invention may be a disposable diaper, a shorts-type sanitary napkin, or the like. The disposable diaper may be an unfolded disposable diaper having fastening tapes on both side edges in the back side of the outer packaging material instead of the pants-type disposable diaper. The deployable disposable diaper usually has a landing tape for fastening a fastening tape on the outer surface of the abdomen, and is fastened to the landing tape and used by the wearer.
Further, the outer packaging material and the composite stretchable part in the present invention may not have other sheets such as the above-described third sheet between the outer layer sheet and the inner layer sheet.
Further, the outer packaging material and the composite stretchable part in the present invention may have a ridge formed on the outer layer sheet smaller than the ridge formed on the inner layer sheet.

FIG. 1 is a perspective view showing a pants-type disposable diaper which is an embodiment of the absorbent article of the present invention. FIG. 2 is a plan view showing a state where the disposable diaper shown in FIG. 1 is expanded and extended. FIG. 3 is an exploded perspective view of the disposable diaper shown in FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 5A and 5B are diagrams showing an absorbent core in the disposable diaper shown in FIG. 1, wherein FIG. 5A is a plan view, FIG. 5B is a cross-sectional view along BB shown in FIG. 1A, and FIG. It is CC sectional drawing. FIG. 6 is a perspective view showing the composite stretchable part in a partially broken view. FIG. 7 is a plan view showing the composite stretchable part in an extended state. FIG. 8 is a partially enlarged view of another longitudinal section of the composite stretchable part, where (a) shows a stretched state, and (b) shows a state in which the folds are contracted and wrinkles are formed. FIG. 9 is a perspective view showing the entire contents of an embodiment of the method for producing a pants-type disposable diaper of the present invention. FIG. 10 is a conceptual diagram showing mainly the steps of forming the composite stretchable part, the non-functionalized region, and the leg elastic member cutting region in the manufacturing method of the present embodiment. FIG. 11 is a conceptual diagram showing mainly the process of forming the composite stretchable part in the manufacturing method of the present embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pants type disposable diaper 11 Side seal part 12 Waist opening part 13 Leg opening part 2 Outer packaging material 21a 3rd sheet 21b Outer layer sheet 22 Inner layer sheet 23 Girth elastic member 24 Waist elastic member 25 Leg elastic member 26 Front crotch elastic member 27 Holding down Sheet 28 Crotch lower part elastic member 3 Absorbent main body 32 Top sheet 33 Back sheet 34 Absorbent core 35 Side cuff 36 Side cuff elastic member 37 Side cuff forming sheet 4 Composite stretchable part 41a First joint part (joint part)
41b 2nd junction part 42 Elastic member 43 ridge 43a Small ridge (the ridge formed by the inner layer sheet)
43c Gavel (the jar formed by the third sheet)
43b Oiso (an cocoon formed by outer sheet)
44 End 51 Non-functionalized area 52 Leg elastic member cutting area 61 Nip roll 62 Upstream uneven roll 62 'Downstream uneven roll 62A Second joint forming part 62A' First joint forming part 62B Nonfunctionalized area forming part 62C Leg elastic member cutting region forming part 63, 63 'anvil roll 64 adhesive coating device 65 swing guide 62D, 62D' embossed spin G1 waist circumference gather G2 waist gather G3 leg gather G4 front groin gather 1S diaper continuous body 13S trim 2S outer packaging Material continuum 21S Outer layer continuum 22S Inner sheet continuum 3S Absorbent body continuum A Abdominal side B Back side C Crotch D Drum circumference E Front crotch

Claims (8)

An absorbent main body including an absorbent core and an outer packaging material joined to the non-skin contact surface side of the absorbent main body, and the outer packaging material is divided into a ventral side portion, a crotch portion, and a back side portion in the longitudinal direction. An absorbent article,
The outer packaging material includes an outer layer sheet, an inner layer sheet , a third sheet disposed between the outer layer sheet and the inner layer sheet, and a plurality of elastic members disposed between the inner layer sheet and the third sheet. The outer packaging material is gathered by the composite stretchable part,
The composite stretch section, the outer sheet and the inner sheet, in a number of joints dispersed in both the expansion and contraction direction and orthogonal direction of the composite stretch unit are joined to each other, so that the elastic member does not pass the the joint portion And both ends of the elastic member are fixed between the outer layer sheet and the inner layer sheet, and each of the outer layer sheet and the inner layer sheet forms a plurality of ridges extending continuously across the plurality of elastic members. And
Ri is Do different sizes of folds formed in the folds and the inner layer sheet formed on the outer sheet,
In the expansion / contraction direction of the composite expansion / contraction section, the second bonding section in which the inner layer sheet and the third sheet are bonded between the bonding sections in which the outer layer sheet and the inner layer sheet are bonded is orthogonal to the expansion / contraction direction. An absorbent article that is formed in a dispersed state and is arranged so that the elastic member does not pass through the joint and the second joint where the outer layer sheet and the inner layer sheet are joined .   The absorbent article according to claim 1, wherein wrinkles formed on the outer layer sheet are larger than wrinkles formed on the inner layer sheet.   The absorptive article according to claim 1 or 2 in which said compound elastic part is formed so that it may expand and contract in a wearer's waist direction at least at a waist part in a stomach side part and / or a back side part. In the joint portion where the outer sheet and the inner sheet are joined, the outer sheet and the inner sheet, these between two sheets are joined in a state sandwiching the third sheet, either of claims 1-3 1 the absorbent article of claim wherein. The absorbent article according to any one of claims 1 to 4, wherein the third sheet forms a plurality of gavel extending continuously over the plurality of elastic members. The absorbent article is a pants-type disposable diaper, and both side edges of the abdomen and back sides of the outer packaging material are joined to each other, and a pair of side seal parts, a waist opening part, and a pair of leg openings part. The absorbent article in any one of Claims 1-5 currently formed. The absorbent main body is disposed across the ventral side of the outer packaging material from the back side,
Between the side edge portion of the absorbent main body and the side seal portion in the waist portion of the abdomen and / or back side portion of the outer packaging material, there is a waist gather in the waist portion. The absorbent article according to claim 6 , wherein a waistline gather made of the composite stretchable part is not formed between the vicinity of the side edges of the absorbent main body. The said absorbent article is an absorptive article in any one of Claims 1-5 which is a deployment type disposable diaper which has a fastening tape in the both-sides edge part in the back side part of the said outer packaging material.

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