JP4863858B2 - Pants-type absorbent article - Google Patents

Description

  The present invention relates to a pants-type absorbent article such as a pants-type disposable diaper and a method for producing the same.

  Conventionally, in a pants-type disposable diaper comprising an absorbent main body including an absorbent core and an outer packaging material joined to the non-skin-contacting surface side of the absorbent main body, improving fit to the wearer, etc. For this purpose, there is known one in which a waistline gather is provided at the waistline portions of the outer side and the backside of the outer packaging material (for example, see 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.

JP 2004-89403 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. The same applies to pants-type absorbent articles other than pants-type disposable diapers.

  Accordingly, an object of the present invention is to provide a pants-type absorbent article having 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 having a waistline gather at the waistline portion. A pant-type absorbent article excellent in the breathability and softness of the waistline portion, fully utilizing the contraction force of the elastic member of the waistline gather, and excellent in cushioning properties in the thickness direction of the waistline gather, and a method for producing the same It is to provide.

  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 is divided into a ventral part, a crotch part, and a dorsal part in the longitudinal direction. A pants-type absorbent article in which a pair of side seal parts, a waist opening part, and a pair of leg opening parts are formed by joining both side edges of the abdominal part and the back part, The outer layer sheet, the inner layer sheet, and a plurality of elastic members disposed between the two sheets, and the absorbent main body extends at least from the ventral part to the crotch part or from the crotch part to the dorsal part. The waistline gathers formed from the composite stretchable part are provided on the waistline part on the stomach side and the back side part of the outer packaging material, and the composite stretchable part includes the outer layer sheet and the inner layer sheet. In the direction of expansion and contraction of the composite expansion / contraction part and the direction perpendicular thereto The elastic members are joined to each other by the missing joints, and the elastic members are arranged so as not to pass through the joints, and are fixed to the outer layer sheets and the inner layer sheets at both ends of the elastic members, and each of the outer layer sheets and the inner layer sheets is plural. Is formed by forming a plurality of ridges extending continuously over the elastic member, and the waistline gathers are absorbent at the ventral side and / or the back side where the absorbent main body is disposed. To provide a pant-type absorbent article that is arranged in the width direction between the vicinity of the side edge portion of the main body and the side seal portion and that is not arranged between the vicinity of the side edge portions of the absorbent main body. The above-mentioned purpose is achieved.

  Moreover, this invention is a manufacturing method of the said underpants type absorbent article in which the non-functioning area | region which does not express the contractile force of the said elastic member is formed in the area | region facing the said absorptive main body in the said outer packaging material. A step of joining the outer layer sheet and the inner layer sheet by the joint portion to form the composite stretchable portion, and a step of forming the non-functionalized region without expressing the contraction force of the elastic member. The manufacturing method of the underpants type absorbent article which performs this using the same roll is provided.

  The present invention also 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 the outer packaging material is abdominal, crotch and dorsal in the longitudinal direction. Pants-type absorptive, in which a pair of side seals, a waist opening and a pair of leg openings are formed by joining the side edges of the abdomen and back sides of the outer packaging material The outer packaging material is formed of an outer layer sheet, an inner layer sheet, and a plurality of elastic members disposed between both sheets, and the absorbent main body is disposed only on the crotch portion of the outer packaging material. In addition, the waistline gathers formed from the composite stretchable part are provided in the waistline part at the stomach side and the back side part of the outer packaging material, and the composite stretchable part is composed of the outer layer sheet and the inner layer sheet in the stretchable direction of the composite stretchable part. And intermittent joints in the direction perpendicular to it The elastic members are arranged so as not to pass through the joint portions, and are fixed to 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 spans a plurality of elastic members. The crotch gathers are provided in the crotch part of the outer packaging material, and the crotch gathers are formed near the side edges of the absorbent main body and the crotch part. The object is achieved by providing a pant-type absorbent article that is arranged in the width direction between the peripheral edge portions and that is not arranged between the side edge portions of the absorbent main body. is there.

  Moreover, this invention is a manufacturing method of the said underpants type absorbent article, Comprising: The said junction part is formed in the said outer-layer sheet and the said inner-layer sheet without interfering with the said elastic member, and the said composite expansion-contraction part is formed. A method for producing a pant-type absorbent article is provided.

According to the pant-type absorbent article of the present invention, the pant has 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 has a waistline gather at the waistline part. The mold absorbent article has excellent breathability and softness of the waistline portion, can sufficiently utilize the contraction force of the elastic member of the waistline gather, and is excellent in cushioning properties in the thickness direction of the waistline gather.
Moreover, according to the manufacturing method of the underpants type absorbent article of this invention, the said underpants type absorbent article can be manufactured efficiently.

Hereinafter, the underpants type absorbent article of the present invention will be described with reference to the drawings based on the first embodiment which is a preferred embodiment thereof.
In the first embodiment, the pant-type absorbent article of the present invention is applied to a pants-type disposable diaper. As shown in FIGS. 1 to 4, the absorbent main body 3 including the absorbent core 34 and the absorbent main body 3. And the outer packaging material 2 joined to the non-skin contact surface side, and is divided in the longitudinal direction into an abdominal part A, a crotch part C, and a dorsal part B. A pants-type disposable diaper in which both side edges are joined to each other to form a pair of side seal portions 11, a waist opening portion 12, and a pair of leg opening portions 13.

  Moreover, the outer packaging material 2 is formed from a plurality of elastic members 23, 24, 25, 26 disposed between the outer layer sheet 21, the inner layer sheet 22, and both sheets 21, 22. It is disposed across the abdominal side A and the back side B of the outer packaging material 2, and the waist part D in the abdominal side A and the back side B of the outer packaging material 2 has a composite stretchable part 4 (see FIG. 9). ) Is formed.

  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 absorbent main body 3 is disposed across the ventral side A to the back side B of the outer packaging material 2, but the longitudinal end of the absorbent main body 3 is more than the longitudinal end of the outer packaging 2. Retreats inward in the longitudinal direction. The absorptive main body 3 is joined to the inner layer sheet 22 of the outer packaging material 2 by a main body joining portion 15 such as an adhesive, a heat seal, and an ultrasonic seal.

  In addition, the longitudinal direction of the whole disposable diaper (absorbent article), the longitudinal direction of the outer packaging material 2 and the longitudinal direction of the absorbent main body 3 are the same, and accordingly, the width direction of the entire disposable diaper (absorbent article), the outer packaging material. The width direction of 2 and the width direction of the absorptive main body 3 also correspond. The “longitudinal end portion” is an end portion in the direction extending in the longitudinal direction, and the “side edge portion” is an end portion in the direction extending in the width direction.

  As shown in FIG. 2, 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, thereby defining 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.

  As shown in FIG. 2, in the vicinity of both ends in the longitudinal direction on the inner surface side of the inner layer sheet 22, a pressing sheet 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. 27 is joined. Accordingly, the skin of the absorbent main body 3 at both ends in the longitudinal direction is covered with the pressing sheet 27. In the pressing sheet 27, 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 the main body 3 are fixed to the outer packaging material 2.

By covering both longitudinal ends of the absorbent main body 3 with the pressing sheet 27, the longitudinal both ends of the absorbent main body 3 are prevented from coming into direct contact with the wearer, and the longitudinal end portions of the absorbent main body 3 are prevented. Therefore, leakage of the superabsorbent polymer in the absorbent core 34 can be prevented.
In addition, this pressing sheet 27 is not indispensable, if the countermeasures against leakage of the superabsorbent polymer is sufficient, or if the appearance and wearing feeling of both ends in the longitudinal direction of the absorbent main body 3 are good to some extent, It can be omitted. In this case, there is a slight demerit that the appearance and wearing feeling are lowered, but there is a great merit that the cost is reduced.

Further, the outer layer sheet 21 longer than the inner layer sheet 22 is used, and the portion extending from the inner layer sheet 22 in the outer layer sheet 21 is folded back to the absorbent main body 3 side, whereby the pressing sheet 27 can be substituted. (Not shown).
The application amount of the hot-melt adhesive used on the bonding surface of the pressing sheet 27 or the extended portion instead of the pressing sheet 27 and the inner layer sheet 22 is the moldability of the collar 43 (described later) of the composite stretchable part 4, From the viewpoint of softness and breathability of the disposable diaper after completion, it is preferable that the amount is small. Similarly, the coating method affects the moldability of the wrinkles.
It is preferable that the ridges 43 of the composite stretchable part 4 are regularly formed from the viewpoint of appearance beauty, softness of the ridges 43, cushioning properties, and original softness of the material.

The application amount of the hot melt adhesive for bonding is preferably 0.5 to 10 g / m ² , particularly preferably 0.5 to 5 g / m ² , and most preferably 0.5 to 3 g / m ² . . If the coating amount is too small, it is difficult to ensure the adhesive strength.
As a coating method, a conventionally known coating method can be used, and a coating method using an omega nozzle is preferable. The coating pattern is preferably rough.
Furthermore, it is possible to adopt a method in which the application amount of the hot melt adhesive is increased only in necessary portions. For example, there is a method of increasing the amount of hot melt adhesive applied to both side edges of the pressing sheet 27. This method can be carried out by using an omega nozzle, curtain spray, slot coater or the like.

As shown in FIGS. 2, 3, and 6, the outer packaging material 2 includes an outer layer sheet 21, an inner layer sheet 22, and a plurality of elastic members 23, 24, 25, and 26 disposed between the sheets 21 and 22. Is formed. FIG. 6 is a developed plan view of the outer packaging material 2 viewed from the inner surface side of the outer layer sheet 21 with the inner layer sheet 22 virtually removed. The outer layer sheet 21 forms the outer surface of the diaper, and the inner layer sheet 22 is disposed on the inner surface side of the outer layer sheet 21.
The outer layer sheet 21 and the inner layer sheet 22 have the same shape, and both ends of the diaper 1 in the longitudinal direction, that is, the ends of the outer layer sheet 21 and the inner layer sheet 22 that form both ends in the longitudinal direction of the outer packaging material 2 are not folded back. Instead, the cut ends of the outer layer sheet 21 and the inner layer sheet 22 are located at the longitudinal ends of the outer packaging material 2.

The inner surface of the outer layer sheet 21 (the surface facing the inner layer sheet 22) is coated with an adhesive Q such as a hot melt adhesive in the coating shape shown in FIG. As shown in FIG. 7, the adhesive Q includes 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 leg elastic member cutting region 52 (described later). ) Is applied to the area corresponding to.
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 C.

On the surface of the inner layer sheet 22 facing the outer layer sheet 21, an adhesive Q such as a hot-melt adhesive is applied in the coating shape shown in FIG. As shown in FIG. 8, 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 portion 4, similarly to the inner surface of the outer layer sheet 21.

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

  At this time, the coating amount of the adhesive Q applied to the inner layer sheet 22 and the coating amount of the adhesive Q applied to the outer layer sheet 21 can be changed. In this way, changing the coating amount can be arbitrarily set in order to ensure the necessary adhesion holding force in accordance with the purpose of bonding, and is a very effective method. Further, not only the coating amount but also the coating pattern can be set arbitrarily. As the adhesive Q, not only one type but also a plurality of types can be arbitrarily used.

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

  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 21, the inner layer sheet 22 and the waist elastic member 24. The composite stretchable part 4 extends between the pair of side seal parts 11. A waist gather G2 is formed (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 expanded state between the outer layer sheet 21 and the inner layer sheet 22 via 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 21, the inner layer sheet 22, and the waistline elastic member 23. By this composite elastic part 4, the vicinity of the side edge part of the absorbent main body 3 and the side seal part 11 are formed. A pair of waistline gathers G1 arranged in the width direction 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 of the absorbent main body 3” means, for example, a baby pants-type diaper, within 60 mm inward in the width direction from the side edge of the absorbent main body 3 and outward in the width direction. An area within 50 mm.

  In the front crotch portion E (the most ventral region when the crotch portion C is divided into 3 to 4 minutes in the longitudinal direction), a plurality of front crotch elastic members 26 are arranged over the entire width direction. The front crotch elastic member 26 is fixed in an expanded state between the outer layer sheet 21 and the inner layer sheet 22 with the adhesive Q interposed therebetween. 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. The elastic member is cut into pieces by cutting or the like. As a result, the elastic member is made non-functional because the stretched state is relaxed and interposed in the outer packaging material 2 in a contracted state.

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 causing the contraction force to be exerted on the waistline elastic member continuous body 23S joined to the outer layer sheet 21 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 the front crotch elastic member continuous body 26S joined to the outer layer sheet 21 and the inner layer sheet 22. It 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. 9 and 10, the composite stretchable part 4 has the following configurations (1) to (3).
(1) The outer layer sheet 21 and the inner layer sheet 22 are joined to each other by an intermittent joining portion 41 in the stretching direction (X direction) of the composite stretchable portion 4 and the direction (Y direction) perpendicular thereto.
(2) The elastic member 42 is disposed so as not to pass through the joint portion 41, and is fixed to the outer layer sheet 21 and the inner layer sheet 22 at both ends of the elastic member 42.
(3) Each of the outer layer sheet 21 and the inner layer sheet 22 forms a plurality of ridges 43 extending continuously over a plurality of elastic members 42.

In the present invention, at least the waistline gather G1 is 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 mainly composed of the outer layer sheet 21, the inner layer sheet 22, and the waistline elastic member 23. The waist gather G2 formed from the composite stretchable part 4 is composed of the outer layer sheet 21, 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 addition, in FIG.1, FIG.2, FIG.12 etc., illustration of the junction part 41 is abbreviate | omitted.

In the composite stretchable part 4, it is preferable that all the elastic members 42 do not pass through all the joints 41. However, for example, some elastic members 42 are part of the joints 41 due to manufacturing errors. May pass through. Even if some elastic members 42 pass through a part (for example, 30% or less (pieces / piece)) of the joint portions 41, the effect of the present invention is sufficiently achieved.
A large pressurizing force is applied to the joining portion 41 in order to achieve joining of the outer layer sheet 21 and the inner layer sheet 22. That is, when the elastic member 42 passes through the joint portion 41, there is a high possibility that the elastic member 42 will be cut. Therefore, it is preferable that the elastic member 42 does not pass through the joint portion 41.

As shown in FIGS. 9 and 10, the outer layer sheet 21 and the inner layer sheet 22 constituting the composite stretchable part 4 are respectively in the stretch direction (X direction) of the composite stretchable part 4 and the direction (Y direction) perpendicular thereto. The joints 41 are intermittently joined together. The joining portion 41 is preferably formed by thermal fusion between the outer layer sheet 21 and the inner layer sheet 22.
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. In the case where 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 43 (described later) extending over the plurality of elastic members 42 extend. Direction.

  FIG. 10 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 a natural state (a state in which no external force is applied), the elastic member 42 contracts, and each of the outer layer sheet 21 and the inner layer sheet 22 continuously extends over the plurality of elastic members 42. (Gather) 43 is formed. In the present embodiment, a single collar 43 is formed between the joint portions 41, 41 adjacent to each other in the stretching direction (X direction) of the composite stretchable portion 4.

  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. 10) is preferably 1 to 20 mm, particularly 3 to 12 mm, and the length L2 (see FIG. 10) of each joint 41 is 0.1 to 5 mm, particularly 0.2 to 2.0 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. By doing so, the contraction force of the elastic member 42 works between the adjacent joint portions 41 separated by the pitch P2, and the formability of the flange 43 can be improved.

  In the composite stretchable part 4, the pitch P3 (see FIG. 10) of the joints 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. 10) 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.

The difference (P2-L2) and (P3-L3) between the pitch and the length are both important numerical values for improving the uniform formability of the flange 43. By taking a numerical value in which the difference (P2−L2) is not too small and not too large, the outer layer sheet 21 and the inner layer sheet 22 are likely to buckle uniformly. Moreover, since the difference (P3-L3) takes a small value, the starting point of buckling of the outer layer sheet 21 and the inner layer sheet 22 is made, and the moldability can be improved.
The plurality of elastic members 42 are preferably arranged at equal intervals from the viewpoint of uniformly shrinking the outer layer sheet 21 and the inner layer sheet 22 in the arrangement direction and ensuring formability.

In the composite stretchable part 4, the outer layer sheet 21 and the inner layer sheet 22 are preferably not joined to each other at a part other than the joint part 41. Each elastic member 42 is arranged in the composite stretchable portion 4 so as not to pass through the joint portion 41 between the outer layer sheet 21 and the inner layer sheet 22, and only the both end portions of the elastic member 42 are connected to the outer layer sheet 21 and the inner layer sheet 22. It is fixed.
Both end portions of the elastic member 42 are fixed between the outer layer sheet 21 and the inner layer sheet 22 in a state sandwiched between the outer layer sheet 21 and the inner layer sheet 22 at both end portions 44 (only one is shown) of the composite stretchable portion 4. Yes. 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.

  Each ridge 43 in the outer layer sheet 21 and the inner layer sheet 22 is formed so as to protrude from both surfaces of the composite stretchable portion 4, and a convex curved surface having an arcuate cross section is formed at the tip in the protruding direction of each ridge 43. Has been. 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 ridge 43 is formed between the joint portions 41, 41 adjacent to each other in the expansion / contraction direction (X direction) of the composite expansion / contraction portion 4, and these ridges 43 are elastic members 42. Without being divided at the overlapping portion, and continuously extending in the direction (Y direction) orthogonal to the expansion / contraction direction of the composite expansion / contraction part 4.

  In the composite stretchable part 4 in this embodiment, each of a large number of ridges 43, 43 formed by contraction of the elastic member 42 extends continuously in a direction (Y direction) perpendicular to the stretchable direction of the composite stretchable part 4. So 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 prevention of the increase in rigidity and the improvement of the degree of freedom of deformation of the flange 43 are such that the elastic member 42 is formed between the valley between the flange 43 and the flange 43 in the outer layer sheet 21 and the flange 43 and the flange 43 in the inner layer sheet 22. It exists in a state of being sandwiched between the valleys between them, and is present in a state where it is not joined to any of the outer layer sheet 21 and the inner layer sheet 22 including the portion sandwiched between those valleys. In addition, the outer layer sheet 21 and the inner layer sheet 22 in the composite stretchable part 4 are not continuously joined in any of the stretchable direction (X direction) of the composite stretchable part 4 and the direction (Y direction) perpendicular thereto. Based on.
Furthermore, due to a synergistic effect with the tip of the collar 43 forming a convex curved surface, a volume appears in the thickness direction of the outer layer sheet 21 and the inner layer sheet 22 and the touch when touching the surface of the composite stretchable part 4 is felt. 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 21 and the inner layer sheet 22, the amount of hot melt adhesive used can be suppressed to zero or a small amount. In particular, as in the present embodiment, when the outer layer sheet 21 and the inner layer sheet 22 are joined to each other by the joining portion 41 by heat fusion, the effect of reducing the amount of adhesive used is 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.
As the outer layer sheet 21 and the inner layer sheet 22, from the viewpoint of forming a flexible ridge 43 that is beautiful to the eye and feels good, an air-through nonwoven fabric, a heat roll nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, a meltblown nonwoven fabric, or a production method thereof. It is preferable that it is the nonwoven fabric etc. which consist of a multilayer which combined these. In particular, an air-through nonwoven fabric is preferable from the viewpoint of feel and cost, and other nonwoven fabrics can be used after being secondarily processed.

  In the composite stretchable part 4, the outer layer sheet 21 and the inner layer sheet 22 are deformed by the contraction of the elastic member 42 to form the flange 43. That is, the rigidity of the outer layer sheet 21 and the inner layer sheet 22 is one of the factors that determine the formability and cushioning properties of the collar 43 of the composite stretchable part 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 by the compression test mode of the Tensilon universal testing apparatus in a measurement environment of 20 ° C. and 65% RH under measurement conditions of a compression speed of 10 mm / min and a measurement distance of 20 mm. 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 21 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 21 and the inner layer sheet 22 are made of a heat-fusible resin from the viewpoint of facilitating joining by heat-sealing (formation of the joining portion 41). Is preferred. 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 21 and the inner layer sheet 22 may be formed of the same material or different materials.

  The outer layer sheet 21 and the inner layer sheet 22 in the present invention are not limited to two separate sheets, but two sheets facing each other are formed by bending one sheet, and a portion constituting one surface is formed. The outer layer sheet 21 and the portion constituting the other surface can also 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, the contracted portions of the outer layer sheet 21 and the inner layer sheet 22 remain, and the remaining outer layer sheet 21 and inner layer sheet 22 extend in the direction opposite to the bonding surface of the joint portion 41 (outside). (Ii) The ridge 43 is formed by deforming into a convex cross section.

  As described above, the height of the flange 43 is an important element related to the moldability and cushioning properties, and the selection of the arrangement pattern and interval of the joint portions 41, the material of the outer layer sheet 21 and the inner layer sheet 22, the elastic member, and the like. Thus, it can be arbitrarily designed. 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 adjacent joint portions 41 is narrowed to form the convex flange 43, so that the soft composite stretchable portion 4 with a sense of volume is formed. Can be formed. When forming the flange 43 having a height on one side, the distance between the joint portions 41 needs to be at least 2 × h. When the distance between the joint portions 41 is 2 × h, the elastic member 42 is required. Needs to shrink to such an extent that adjacent joints 41 are 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 in 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 raw material original texture of the outer-layer sheet 21 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. Further, the fact that the contraction force of the elastic member 42 is not hindered means that the size of the elastic member can be reduced when the expansion ratio is the same, and the amount of use of the elastic member 42 can be reduced. But it is advantageous.

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.
In addition, since the end portions of the outer layer sheet 21 and the inner layer sheet 22 that form both ends in the longitudinal direction of the diaper 1 are not folded back, the end portions that are not folded are opened when the composite stretchable portion 4 contracts. The air permeability is improved by the opening. The outer layer sheet 21 and the inner layer sheet 22 are formed in a straw shape up to the end, and the appearance is improved.

  Next, the manufacturing method of the underpants type absorbent article 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. 11: is a perspective view which shows the whole content of one embodiment of the manufacturing method of the underpants type disposable diaper of this invention. FIG. 12 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. 13 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 is a process which joins the outer layer sheet | seat 21 and the inner layer sheet | seat 22 by the junction part 41, as shown in FIGS. It is characterized in that the same roll 62 is used to perform the step of forming the non-functionalized region 51 without expressing the contraction force of the members 23 and 26.
In the manufacturing method of this embodiment, as shown in FIG. 11, the continuous body 21S of the outer layer sheet 21 and the continuous body 22S of the inner layer sheet 22 are interposed between the continuous bodies 23S of the elastic members 23, 24, 25, 26. 24S, 25S, and 26S are sandwiched and joined to form a continuous body 2S of the outer packaging material 2, and then the absorbent main body 3 is placed on the inner layer sheet continuous body 22S side of the outer packaging material continuous body 2S on the main body joint portion 15 (FIG. 4). The diaper continuum 1S is formed by joining the diapers, and then the diaper continuum 1S is divided to form individual diapers 1.

The manufacturing method of this embodiment will be described in detail. The outer layer sheet continuous body 21 </ b> S is used as the original sheet of the outer layer sheet 21, and the inner layer sheet continuous body 22 </ b> S is used as the original sheet of the inner layer sheet 22.
Each continuous body 23S, 24S, 25S, 26S of each elastic member 23, 24, 25, 26 is introduced between the outer layer sheet continuous body 21S and the inner layer sheet continuous body 22S in an expanded state. In addition, in FIG. 12, illustration of the continuous body 26S of the front crotch elastic member 26 is abbreviate | omitted. Before the outer layer sheet continuous body 21S and the inner layer sheet continuous body 22S merge, the coating positions shown in FIGS. 7 and 8 are formed on the respective facing surfaces by the adhesive coating device 64 (see FIG. 12). The hot melt adhesive Q is applied to the surface. Further, the continuum 25S of the leg elastic member 25 is swung so as to follow the shape of the leg opening 13 by the swing guide 65 (see FIG. 12), while the outer layer sheet continuum 21S and the inner layer sheet continuum 22S. Introduced between.

Both sheet continuums 21S and 22S are compressed between the pair of nip rolls 61 and 61 with the elastic member continuums 23S, 24S, 25S, and 26S sandwiched therebetween. As a result, an outer packaging material continuum 2S is obtained in which the elastic member continuums 23S, 24S, 25S, and 26S are sandwiched and joined between the sheet continuums 21S 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 part 4, the non-functionalized region 51, and the leg elastic member cutting region 52 are not formed in the outer packaging material continuous body 2S.

Next, the outer wrapping material continuous body 2 </ b> S in which the composite stretchable part 4 or the like is not formed is introduced between the composite stretchable part forming roll 62 and the anvil roll 63. The composite stretchable part forming roll 62 includes a composite stretchable part forming part 62A that forms the composite stretchable part 4 on its peripheral surface, and a non-functionalized region forming part 62B that forms the nonfunctionalized region 51 and leg elastic member cutting. A leg elastic member cutting region forming part 62 </ b> C that forms the region 52 is provided. In FIG. 12, the composite stretchable part forming part 62A that forms the composite stretchable part 4 of the waistline gather G1 is shown, but the composite stretchable part forming part that forms the composite stretchable part 4 of the waist gather G2 is shown. Omitted.
The anvil roll 63 is a receiving roll for the composite stretchable part forming roll 62, and its peripheral surface is a smooth surface.

  A plurality of embossed spins 62D (see FIG. 13; not shown in FIG. 12) are provided in the composite stretchable part forming part 62A of the composite stretchable part forming roll 62 corresponding to the joint part 41 of the composite stretchable part 4. According to the composite stretchable part forming part 62A, the joint part 41 can be formed in a region corresponding to the composite stretchable part 4 in the outer packaging material continuous body 2S in which the composite stretchable part 4 is not formed. The emboss spin 62D may be a heat emboss spin or an ultrasonic emboss spin. FIG. 13 is a conceptual diagram showing only elements closely related to the process of forming the composite stretchable part 4. Therefore, for example, only the composite stretchable part forming part 62A is illustrated on the peripheral surface of the composite stretchable part forming roll 62, and only the composite stretchable part 4 is illustrated for the outer packaging material continuous body 2S.

  In the present manufacturing method, it is preferable to form the composite stretchable part 4 by forming the joining part 41 in the outer layer sheet 21 and the inner layer sheet 22 without interfering with the elastic members 23 and 24. In other words, it is preferable that the joint 41 and the elastic member continuous bodies 23S and 24S do not interfere with each other when the composite stretchable part 4 is formed. As described above, since a large pressing force is applied to the joint portion 41 when it is formed by thermal fusion, if the joint portion 41 interferes with the elastic member continuums 23S, 24S, the elastic member continuum 23S, There is a high possibility that 24S is cut. Therefore, the elastic member continuous bodies 23S and 24S introduced between the two sheet continuous bodies 21S and 22S are introduced between the composite stretchable part forming roll 62 and the anvil roll 63 while accurately controlling the introduction position. To do. In these transport systems, it is essential that the tension of each continuous material 21S, 22S, 23S, 24S is in a stable state.

  And as a method which does not make the junction part 41 and elastic member continuous body 23S, 24S interfere, it is preferable to arrange | position the distance between each process as short as possible. Of particular importance is the distance between the three members of the elastic member continuum 23S, 24S (elastic member) introduction roll 66, the pair of nip rolls 61, 61, the pair of composite stretchable part forming rolls 62 and the anvil roll 63. . The distance between the steps is preferably the shortest distance within a physically possible range.

The distance from the introduction roll 66 of the elastic member continuous body 23S, 24S to the pinching point of the pair of nip rolls 61, 61 is preferably 10 to 1,000 mm, and particularly preferably 10 to 300 mm. Similarly, the distance from the pinching point of the pair of nip rolls 61, 61 to the contact point between the pair of composite stretchable part forming rolls 62 and the anvil roll 63 is preferably 10 mm to 1,000 mm, particularly preferably 10 to 500 mm. is there.
Further, the elastic member introduction roll 66 needs to be designed so that there is no backlash in the thrust direction of the roll itself and that the width of the roll groove that causes meandering is narrow. For example, the shape of the roll groove is preferably not a U-shaped cross section but a V-shaped cross section with little play.

Then, as shown in FIGS. 14 and 15, the elastic member 42 (in this embodiment, the waistline elastic member 23 and the waist elastic member 24 correspond) is shrunk so that a plurality of sheets are provided on each of the two sheet continuous bodies 21S and 22S. By forming the collar 43, the composite stretchable part 4 that forms the waistline gather G1 and the waist gather G2 is obtained in a predetermined region of the outer packaging material continuous body 2S. In the region where the pressing sheet 27 exists, the pressing sheet 27 also has a hook shape as shown in FIG.
14 is a cross-sectional view showing the composite stretchable part 4 in the region where the pressing sheet 27 is not present, and FIG. 15 is a cross-sectional view showing the composite stretchable part 4 in the region where the presser sheet 27 is present.

  The non-functionalized region forming part 62B of the composite stretchable part forming roll 62 is a part that prevents the contractive force of the elastic member from being expressed, 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 part 62C of the composite stretchable part forming roll 62 is a part for cutting the leg elastic member continuous body 25S existing at the position of the crotch part C in the center in the width direction. Can be formed. 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.

  Between the composite stretchable part forming roll 62 having the above configuration and the anvil roll 63, the outer envelope material continuous body 2S in which the composite stretchable part 4, the non-functionalized area 51, and the leg elastic member cutting area 52 are not formed is inserted. By doing so, the outer packaging material continuous body 2S in which the composite stretchable part 4, the non-functionalized region 51, and the leg elastic member cutting region 52 are formed in a predetermined region 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. 11, 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. The absorbent main body 3 is also generally provided with an elastic member that contracts in the longitudinal direction (in the embodiment, the side cuff elastic member 36). The sex main body 3 is fixed to the outer packaging material continuum 2S while keeping it from shrinking.

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.11 and FIG.12, 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 a method of intermittently fixing the absorbent main body 3 by 90 degrees and intermittently fixing it on the outer packaging material continuum 2S, for example, a method described in JP-A-4-166150 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.

  According to the manufacturing method of this embodiment, the outer layer sheet 21 and the inner layer sheet 22 are joined by the joining portion 41 to form the composite stretchable portion 4, and the contraction force of the elastic members 23 and 26 is not expressed. Since the step of forming the functionalized region 51 is performed using the same roll 62, a pants-type disposable diaper provided with the composite stretchable part 4 and the non-functionalized region 51 can be efficiently produced.

  Next, other embodiments of the pant-type absorbent article of the present invention will be 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.

As shown in FIG. 16, the pants-type disposable diaper according to the second embodiment is different from the first embodiment in the configuration for expressing the contractibility of the crotch part C. 16 is a view corresponding to FIG. 6 in the first embodiment, and is a developed plan view of the outer packaging material 2 viewed from the inner surface side of the outer layer sheet 21 in a state where the inner layer sheet 22 is virtually removed. .
Specifically, in the second embodiment, as shown in FIG. 16, as compared with the first embodiment, the leg elastic member 25 along the leg opening 13 that forms the leg gather G3 is not provided. . Instead, the crotch part C is provided with a large number of crotch elastic members 28 extending along the width direction of the outer packaging material 2. Due to the contraction force of the large number of crotch elastic members 28, the crotch part C develops shrinkage in the width direction, and a crotch gather G5 is formed. The crotch gather G5 may be formed from the composite stretchable part 4, or may not be formed.

The crotch gather G5 (crotch lower elastic member 28) is arranged in the width direction between the vicinity of the side edge of the absorbent main body 3 and the peripheral edge of the crotch C (leg opening 13). It is not arranged between the side edge portions of the sex main body 3. The vicinity of the side edge portions of the absorbent main body 3 is a non-functionalized region 51 as in the vicinity of the side edge portions of the absorbent main body 3 in the waistline portion D.
Other configurations are the same as those in the first embodiment.

  In the pants-type disposable diaper of the third embodiment, as shown in FIG. 17, the outer packaging material 2 does not exist in the crotch C as compared with the first embodiment, and the abdominal side A and the back side B The only difference is that they exist only in the longitudinal direction and are separated in the longitudinal direction. FIG. 17 is a diagram corresponding to FIG. 6 in the first embodiment, and is a developed plan view of the outer packaging material 2 viewed from the inner surface side of the outer layer sheet 21 with the inner layer sheet 22 virtually removed. .

Therefore, in the third embodiment, the outer packaging material 2 on the abdominal side A and the outer packaging material 2 on the back side B are connected via the absorbent main body 3.
Other configurations are the same as those in the first embodiment.
According to the third embodiment, the same effects as in the first embodiment can be obtained, and the amount of the outer packaging material 2 used can be reduced, which is advantageous in terms of cost.

In the pants-type disposable diaper of the fourth embodiment, the absorbent main body 3 is present in the outer packaging material 2 of the abdominal part A and the back part B as compared to the second embodiment, as shown in FIG. The main difference is that only the outer packaging material 2 of the crotch part C is provided. 18 is a view corresponding to FIG. 16 in the second embodiment, and is a developed plan view of the outer packaging material 2 viewed from the inner surface side of the outer layer sheet 21 in a state where the inner layer sheet 22 is virtually removed. .
Further, the outer packaging material 2 of the abdominal part A and the back part B is not provided with the non-functionalized region 51, and the waistline elastic member 23 forming the waistline gather G1 is disposed over the entire width direction. Has been. Further, as compared with the second embodiment, the number of crotch elastic members 28 is small, and the range in which the crotch elastic members 28 are provided is small.

Other configurations are the same as those of the second embodiment. For example, a crotch gather G5 is provided in the crotch part C of the outer packaging material 2. The crotch gather G5 (crotch lower elastic member 28) may or may not be formed from the composite stretchable part 4. Further, the crotch gather G5 is disposed in the width direction between the vicinity of the side edge of the absorbent main body 3 and the peripheral edge of the crotch C, but between the vicinity of the side edge of the absorbent main body 3 Is not arranged. A non-functionalized region 51 is formed between the side edge portions of the absorbent main body 3.
According to the fourth embodiment, the same effects as those of the second embodiment are achieved.

The configuration of the composite stretchable portion 4 is not limited to the configuration of the composite stretchable portion 4 shown in FIGS. 9 and 10. For example, the joint portions 41 may be arranged in a staggered manner as shown in FIG. That is, an array pattern in which the positions of the joint portions 41 are shifted by a half pitch (P1 / 2) between the row in the stretch direction (X direction) of the composite stretchable portion 4 and the row adjacent thereto.
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.
Between the column in the expansion / contraction direction (X direction) of the composite stretchable portion 4 and the row adjacent thereto, a region where the joint portion 41 does not exist is continuously formed between both end portions 44 of the composite stretchable portion 4. 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.

  From the viewpoint of reliably forming the flange 43 extending continuously over the plurality of elastic members 42, in the state where the composite stretchable portion 4 is extended (the state shown in FIG. 19), the stretch direction (X The pitch P1 (see FIG. 19) of the joint portions 41 in the direction) is preferably 1 to 30 mm, particularly 6 to 20 mm, and the length L1 (see FIG. 19) of each joint portion 41 is 0.1. It is preferably ˜5 mm, particularly preferably 0.2 to 1.5 mm. The ratio of the pitch P1 to the length L1 (P1 / L1) is preferably 1.1 to 300, particularly 4 to 100.

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 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 21 and inner layer sheet 22, but the outer packaging material 2 is the same shape as the outer packaging material 2 and the outer layer sheet 21. A laminate of the inner layer sheet 22 having a separation shape (same shape as the shape of the inner layer sheet 22 in the third embodiment shown in FIG. 17) that exists only in the ventral side A and the back side B and does not exist in the crotch C It may be formed from. In the outer packaging material 2 having this configuration, the crotch portion C is formed only from the outer layer sheet 21.

  Although the absorptive main body 3 is arrange | positioned ranging from the abdominal side part A of the outer packaging material 2 to the back side part B in 1st Embodiment, it is not restricted to this, The abdominal side part A of the outer packaging material 2 From the crotch C of the outer packaging material 2 to the dorsal side B, but the ventral part A. May be arranged so as not to exist. In these cases, the waistline gather G1 may be arranged between the pair of side seal portions 11 in the abdominal side A or the back side B where the absorbent main body 3 is not disposed.

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 of being joined to the outer layer sheet 21 and the inner layer sheet 22. Further, the end portion of the elastic member 42 joined to both the sheets 21 and 22 may be present inside the end portion 44 of the composite stretchable portion 4 in the stretchable direction (X direction).
The number of 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, but can be 5 to 100, 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. As shown in FIG. 10 or FIG. 19, the joint portions 41 do not necessarily have to be geometrically aligned, and may be arranged irregularly (randomly), for example. 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 pants-type absorbent article of the present invention is not limited to pants-type disposable diapers, and can be applied to, for example, pants-type sanitary napkins.

FIG. 1 is a perspective view showing a pants-type disposable diaper as a first embodiment of the present invention. FIG. 2 is a plan view showing a state in which the disposable diaper shown in FIG. 1 is developed 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 shown 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 developed plan view of the outer packaging material viewed from the inner surface side of the outer layer sheet in a state where the inner layer sheet is virtually removed. FIG. 7 is a developed plan view showing the application position of the adhesive on the outer layer sheet. FIG. 8 is a developed plan view showing the application position of the adhesive in the inner layer sheet. FIG. 9 is a perspective view showing the composite stretchable part in a partially broken view. FIG. 10 is a plan view showing the composite stretchable part in an expanded state. FIG. 11: is a perspective view which shows the whole content of one embodiment of the manufacturing method of the underpants type absorbent article of this invention. FIG. 12 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 embodiment shown in FIG. FIG. 13 is a conceptual diagram showing mainly the process of forming the composite stretchable part in the manufacturing method of the embodiment shown in FIG. FIG. 14 is a partially enlarged view of the longitudinal section of the composite stretchable part, where (a) is a diagram showing an expanded state, and (b) is a diagram showing a state in which folds are contracted and wrinkles are formed. FIG. 15 is a partially enlarged view of another longitudinal section of the composite stretchable portion, where (a) is a diagram showing an extended state, and (b) is a diagram showing a state in which the folds are contracted and wrinkles are formed. FIG. 16 is a development plan view (corresponding to FIG. 6) of the outer packaging material in the second embodiment of the pant-type absorbent article of the present invention viewed from the inner surface side of the outer layer sheet in a state where the inner layer sheet is virtually removed. is there. FIG. 17 is a developed plan view (corresponding to FIG. 6) of the outer packaging material according to the third embodiment of the pant-type absorbent article of the present invention viewed from the inner surface side of the outer layer sheet with the inner layer sheet virtually removed. is there. FIG. 18 is a developed plan view (corresponding to FIG. 16) of the outer packaging material in the fourth embodiment of the pant-type absorbent article of the present invention viewed from the inner surface side of the outer layer sheet in a state where the inner layer sheet is virtually removed. is there. FIG. 19 is a plan view (corresponding to FIG. 10) showing another form of the composite stretchable part in an expanded state.

Explanation of symbols

1 Pants-type disposable diapers (pants-type absorbent articles)
DESCRIPTION OF SYMBOLS 11 Side seal part 12 Waist opening part 13 Leg opening part 2 Outer packaging material 21 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 Pressing sheet 28 Inseam elastic member 3 Absorbency 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 41 Joint part 42 Elastic member 43 襞 44 End part 51 Non-functionalized area 52 Leg Elastic member cutting area 61 Nip roll 62 Composite stretchable part forming roll 62A Composite stretchable part forming part 62B Non-functionalized area forming part 62C Leg elastic member cutting area forming part 63 Anvil roll 64 Adhesive coating device 65 Swing guide 66 Elastic member introduction Roll G1 Girth Gather G West gather G3 Leg gather G4 Front crotch gather G5 Inseam gather 1S Diaper continuum 13S Trim 2S Outer packaging continuum 21S Outer sheet continuum 22S Inner sheet continuum 3S Absorbent body continuum A Abdominal side B Back side C Inseam D waistline E front crotch

Claims (7)

It has 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 is divided into an abdominal part, a crotch part, and a dorsal part in the longitudinal direction. The pants-type absorbent article in which both side edges of the portion and the back side are joined together to form a pair of side seal portions, a waist opening, and a pair of leg openings,
The outer packaging material is formed of an outer layer sheet, an inner layer sheet, and a plurality of elastic members disposed between the two sheets, and the absorbent main body extends at least from the ventral side to the crotch or from the crotch to the back. Arranged across the side,
A waistline gather formed from a composite stretchable part is provided on the waistline part of the outer side of the outer packaging material and the back side part,
In the composite stretchable part, the outer layer sheet and the inner layer sheet are joined to each other by an intermittent joint in the stretchable direction of the composite stretchable part and the direction orthogonal thereto, and the elastic member is arranged so as not to pass through the joint. Are fixed to the outer layer sheet and the inner layer sheet at both ends of each of the outer layer sheet and the inner layer sheet, and each of the outer layer sheet and the inner layer sheet is formed by forming a plurality of ridges continuously extending over a plurality of elastic members,
The waistline gather is disposed in the width direction between the side edge portion of the absorbent main body and the side seal portion in the abdominal side and / or the back side where the absorbent main body is disposed, and It is not arranged between the side edge portions of the absorbent main body,
A waist gather is provided in the vicinity of the waist opening in the ventral side and the back side of the outer packaging material, respectively, and the waist gather is also formed from the composite stretchable part.
The outer packaging material has a rectangular pressing sheet at each of both longitudinal ends of the inner layer sheet, and the both longitudinal ends of the absorbent main body are covered by the pressing sheet. Or a part covering the adhesive body is bonded to both ends in the longitudinal direction of the absorbent main body via an adhesive ,
Alternatively, the outer packaging material has the outer layer sheet that is longer than the inner layer sheet, and the ends of the outer layer sheet that are extended from the inner layer sheet are folded back toward the absorbent main body so that both ends in the longitudinal direction of the absorbent main body A portion covering both ends in the longitudinal direction is bonded to both ends in the longitudinal direction of the absorbent main body via an adhesive,
In the outer packaging material facing the absorbent main body, a non-functionalized region that does not allow the elastic member to develop a contracting force is formed,
On the surface of the outer layer sheet facing the inner layer sheet, an adhesive is applied to a region corresponding to the pair of side seal portions and a region corresponding to the non-functionalized region of the elastic member, and the composite stretchable portion The adhesive is not applied to the area corresponding to
In the inner layer sheet, the surface facing the outer layer sheet includes a pair of side seal portions so as to include the shape of the adhesive applied to the surface facing the inner layer sheet of the outer layer sheet. Corresponding region, an adhesive is applied to a region corresponding to the non-functionalized region of the elastic member, and the adhesive is not applied to a region corresponding to the composite stretchable part,
The extended part of the pressing sheet or the folded outer layer sheet is a pants type having a ridge shape corresponding to the plurality of ridges of the inner layer sheet forming the waist gather and the waistline gather Absorbent article. The waist gathers are pant-type absorbent article according to claim 1, characterized in that disposed over between the pair of the side seal portion. Ends of the outer layer sheet and the inner sheet to form the longitudinal ends of the pants-type absorbent article, both folded back Orazu,
The outer packaging material has a rectangular pressing sheet at each of both longitudinal ends of the inner layer sheet, and the both longitudinal ends of the absorbent main body are covered by the pressing sheet. The pants-type absorbent article according to claim 1 or 2 , wherein a portion covering the adhesive is adhered to both ends in the longitudinal direction of the absorbent main body via an adhesive . The pants according to any one of claims 1 to 3 , wherein the inner layer sheet forming the ventral side portion of the outer packaging material and the inner layer sheet forming the back side portion are separated at the crotch part. Mold absorbent article. The pants-type absorbent article according to any one of claims 1 to 4 , wherein the composite stretchable part is not provided in the crotch part of the outer packaging material. It is a manufacturing method of the underpants type absorbent article according to claim 1 ,
The step of joining the outer layer sheet and the inner layer sheet by the joining portion to form the composite stretchable portion and the step of forming the non-functionalized region without expressing the contraction force of the elastic member are the same. The manufacturing method of the underpants type absorbent article performed using the roll of this. It is a manufacturing method of the underpants type absorbent article according to claim 1,
The manufacturing method of the underpants type absorbent article which forms the said composite expansion-contraction part by forming the said junction part in the said outer-layer sheet and the said inner-layer sheet without interfering with the said elastic member.

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