JP2008029836A - Method of manufacturing disposable diaper, sheet member and pleated sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a disposable diaper, enhancing a close contact performance to a wearer, having no incompatibility and having an excellent cushioning performance, by using such an outer member thereof that has a stacking layer structure of an inner layer sheet and an outer layer sheet, at least one of the inner layer sheet and the outer layer sheet being a pleated sheet having a rugged pattern; and methods of manufacturing a sheet member using the outer member, an inner layer pleated sheet, and an outer layer pleated sheet. <P>SOLUTION: According to this method of manufacturing a disposable diaper, a disposable diaper having excellent cushioning performance is obtained by using a chassis formed of the outer member in which the inner layer sheet and the outer layer sheet are stacked through an elastic member, and at least one of the inner layer sheet and the outer layer sheet is a pleated sheet where a rugged pattern is formed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a disposable diaper, a sheet member, and a method for manufacturing a pleated sheet. In particular, a disposable diaper using an external member having a laminated structure of an inner layer sheet having a concavo-convex pattern and an outer layer sheet having a concavo-convex pattern, a sheet member using the external member, and production of an inner pleat sheet and an outer pleat sheet Regarding the method.

  Conventional disposable absorbent articles include, for example, disposable diapers. Disposable diapers are widely used from infants and children to the elderly and the disabled, and have come to replace reusable cloth absorbent articles. A typical disposable diaper generally consists of a composite structure including a topsheet and a backsheet and an absorbent body between the topsheet and the backsheet. In addition, in order to improve the adhesion to the wearer and the cushioning properties, two types of non-stretchable sheet members are stuck through stretched elastic members such as threads, nets, belts, sheets, etc. A stretchable composite sheet that imparts stretchability to a conductive sheet member is used.

  When the elastic member in the stretchable composite sheet is in a contracted state, each sheet member forms a large fold, and cushioning properties can be obtained by the fold. However, when the wearer wears a disposable diaper, since the elastic member is usually stretched, the rigidity becomes high, the adhesion to the wearer's skin is poor, the contact feeling becomes hard, and the touch is poor. That is, cushioning properties cannot be obtained.

  In recent years, it has been reported that if wrinkles continue to irritate the skin, it affects the body as a tactile stimulus, causing not only discomfort but also endocrine function and autonomic dysfunction, and even affects intelligence development. Therefore, it has become an urgent need to provide disposable diapers that are soft to the touch and excellent in cushioning properties.

For this reason, for example, in Patent Document 1, the body elastic portion is disposed in the circumferential direction by being sandwiched between the front exterior member and the rear exterior member at intervals of 1 to 5 mm in the body fitting portion of the disposable pants. Disposable diapers are provided in which fine vertical gathers with a pitch of about 3 mm or less are formed over the entire fit portion.
JP 2002-238934 A

  However, since the elastic yarn is arranged in the circumferential direction so as to be sandwiched between the front side exterior member and the back side exterior member at an interval of 1 to 5 mm in the waist elastic part, the weight per unit of the elastic member and the adhesive is high. Become. For this reason, since there is no large and deep wrinkle, even if the feeling of stiffness is eliminated, there are cases where the rigidity is high and the sense of contact with the skin is poor.

  DISCLOSURE OF THE INVENTION The present invention has been made in view of the above, and a disposable diaper that a wearer can feel and use without feeling uncomfortable, a sheet member that can be used while feeling cushioning, and this sheet member It is an object of the present invention to provide a method for producing a pleated sheet which is a constituent sheet of the above.

  The present inventors have made extensive studies to solve the above problems. As a result, it was found that by using an external member laminated with a pleated sheet for the chassis of a disposable diaper, the adhesion to the wearer is enhanced, and there is no sense of incongruity and excellent cushioning properties, and the present invention has been completed. It was. More specifically, the present invention provides the following.

  (1) A chassis comprising a front body and a back body, having a waist opening, and a pair of left and right leg openings in the crotch, and a liquid-permeable top disposed on at least a part of the chassis A sheet, a liquid-impermeable back sheet disposed on one side in the thickness direction of the liquid-permeable top sheet, and disposed between the liquid-permeable top sheet and the liquid-impermeable back sheet. A disposable diaper comprising a liquid-retaining absorber, wherein an inner layer sheet, an outer layer sheet, and the outer layer sheet are disposed between the trunk periphery opening and the leg periphery opening of the chassis. An outer member including one or a plurality of thread-like or belt-like elastic members disposed between an inner layer sheet and the outer layer sheet, and at least one of the inner layer sheet and the outer layer sheet includes the waistline Aperture And convex pattern is continuously formed in parallel, the resilient member is disposable diaper, characterized in that it is arranged along the direction in which the uneven pattern is formed.

  (2) The disposable diaper according to (1), wherein the outer member is formed by laminating the inner layer sheet and the outer layer sheet via a stretched elastic member.

  (3) The disposable diaper according to (1) or (2), wherein in the external member, when the elastic member contracts, a number of ridges are formed along the uneven pattern.

  (4) The disposable diaper according to (3), wherein the height of the bag is 1 to 6 mm.

  (5) The disposable diaper according to any one of (1) to (4), wherein the height of the convex portions of the concave-convex pattern of the inner layer sheet and the outer layer sheet is 0.5 to 5 mm.

  (6) The inner layer sheet and the outer layer sheet have at least one shaping region in which the concave / convex pattern is formed and at least one groove region in which a planar pattern is formed (1) to (5) The disposable diaper according to any one of the above.

  (7) The disposable diaper according to any one of (1) to (6), wherein a width of the shaping region is 2 mm to 10 cm, and a width of the groove region is 0.5 mm to 3 cm.

  (8) The disposable diaper according to any one of (1) to (7), wherein an adhesive is applied to the elastic member and is laminated by being bonded to the groove region.

  (9) The disposable diaper according to any one of (1) to (8), wherein the external member has an end groove region and is joined via the end groove region.

(10) The disposable diaper according to any one of (1) to (9), wherein a basis weight of the inner layer sheet and the outer layer sheet is 5 to 50 g / m ² .

  (11) The disposable diaper according to any one of (1) to (10), wherein the heights of the convex portions of the inner layer sheet and the outer layer sheet are the same.

  (12) The disposable diaper according to any one of (1) to (10), wherein heights of convex portions of the inner layer sheet and the outer layer sheet are different.

  (13) The disposable diaper according to any one of (1) to (12), wherein an interval between convex portions of the inner layer sheet and the outer layer sheet is the same.

  (14) The disposable diaper according to any one of (1) to (12), wherein an interval between the convex portions of the inner layer sheet and the outer layer sheet is different.

  (15) a first sheet, a second sheet, and one or more thread-like or belt-like elastic members disposed between the first sheet and the second sheet, and at least the A 1st sheet | seat is a sheet | seat member currently formed in uneven | corrugated shape along a longitudinal direction, Comprising: A several convex part and a several recessed part are alternately continuous in a longitudinal direction on said 1st sheet | seat. The elastic member is disposed along the longitudinal direction, and the plurality of recesses are joined to the elastic member in an expanded state.

  (16) The sheet member according to (16), wherein a large number of wrinkles are formed when the elastic member contracts.

  (17) A sheet is formed between a pair of shaping rolls having at least one toothed region and at least one grooved region, thereby producing a pleated sheet formed in an uneven shape along the longitudinal direction. A method for producing a pleated sheet, characterized in that:

  (18) The pleated sheet manufacturing method according to (17), wherein the grooved region is covered with a heat insulating material.

  According to this embodiment, the wearer can now provide a disposable diaper that can be used while feeling cushioning without a sense of incongruity, and a sheet member that can be used while feeling cushioning.

  In the disposable diaper of the present invention, the chassis uses an outer member in which at least one of the inner layer sheet and the outer layer sheet is formed by laminating an inner layer pleated sheet and an outer layer pleated sheet on which an uneven pattern is formed via an elastic member. Each of the pleated sheets is stuck in a state where the elastic member is stretched at the time of lamination. Hereinafter, embodiments of the method for producing a disposable diaper, a sheet member, and a pleated sheet of the present invention will be described in detail, but the present invention is not limited to the following embodiments, and is within the scope of the object of the present invention. However, it can implement by changing suitably. In addition, although description is abbreviate | omitted suitably about the location where description overlaps, the meaning of invention is not limited. For convenience of explanation, the case where the inner layer sheet and the outer layer sheet are an inner layer pleated sheet and an outer layer pleated sheet in which a concavo-convex pattern is formed will be described in detail. However, the present invention is not limited to the embodiment of the present invention.

  In the following embodiments, the side of the disposable diaper that is directed to the wearer's body is the skin contact surface side, and the side opposite to the skin contact surface side is the non-skin contact surface side.

[Disposable diapers]
FIG. 1 is a front view of the disposable diaper of the present invention. As shown in FIG. 1 (A), the disposable diaper main body forms an outer shape of the disposable diaper main body, and includes a chassis 5 composed of a front body 51 and a rear body 52 that are formed into a pants shape when worn, Provided on the skin contact surface side, provided on the non-skin contact surface side of the chassis 5, which is one side of the liquid permeable top sheet 1 and the liquid permeable top sheet 1 that is formed in a substantially vertically long shape that constitutes the surface layer The liquid-impermeable back sheet 2 formed in a substantially vertically long shape constituting the back surface layer, and the liquid-permeable top sheet 1 and the chassis 5 between the liquid-permeable top sheet 1 and the liquid-impermeable back sheet 2. And a liquid-retaining absorbent body 3 that is formed in a substantially vertically long shape and constitutes an absorption layer. Here, “substantially long” includes a substantially rectangular shape having a longitudinal direction and a short direction, and a part of both sides of the longitudinal direction is recessed in the central direction in the longitudinal direction, or opposite to the central direction. Including those raised in the direction. That is, the absorbent body 3 includes a part of the longitudinal direction of the absorbent body 3 that has a different length in the width direction. Moreover, the absorber 3 may be arrange | positioned so that it may become vertically long in the width direction, and may be arrange | positioned so that it may become vertically long in the up-down direction.

  The absorbent body 3 may be arranged in a state of being wrapped in a tissue (not shown) or a hydrophilic nonwoven fabric (not shown). Moreover, when wrapped in a hydrophilic nonwoven fabric, a configuration in which the liquid-permeable top sheet 1 is not used or a configuration in which the liquid-permeable top sheet 1 is only partially used may be used. Thereby, for example, it is possible to reduce the production cost. Furthermore, the liquid-impermeable back sheet 2 may be a non-skin contact surface side of the liquid-impermeable back sheet 2 bonded with a nonwoven fabric or the like. It is preferable to bond a non-woven fabric or the like to the non-skin contact surface side of the liquid-impermeable back sheet 2 because the touch when worn by the wearer is improved. Moreover, when a film is used for the liquid-impermeable back sheet 2, it is preferable to bond a nonwoven fabric or the like to the film, for example, because unpleasant sound generated due to film rubbing can be prevented.

  The chassis 5 includes a front body 51 when worn, a back body 52, and a crotch portion 53 formed between the front body 51 and the back body 52. The chassis 5 is formed in a pants shape by joining the front body 51 and the back body 52 at a joint 6 that is a predetermined position between the front body 51 and the back body 52. That is, it has the trunk periphery opening part 7 located in a wearer's abdomen circumference | surroundings, and a pair of leg periphery opening part 8 located in each of a wearer's both legs. Here, the predetermined positions of the front body 51 and the back body 52 are the legs of the front body 51 and the back body 52 in the direction orthogonal to the vertical direction in the wearing state (hereinafter referred to as the width direction). This refers to the portion excluding the surrounding opening 8. Moreover, the front body 51 and the back body 52 include what is distinguished by the width direction centerline which bisects the longitudinal direction of a disposable diaper main body, for example.

  FIG. 1B is a partially enlarged view of the front body 51. The front body 51 includes an external member 4 in which an inner layer pleat sheet 41 and an outer layer pleat sheet 42 are laminated (joined) via a plurality of elastic members 9, and the outer member 4 includes a waist opening 7 and a pair of legs. It is arranged between the surrounding opening 8. When the inner layer pleat sheet 41 and the outer layer pleat sheet 42 are laminated while the elastic member 9 is stretched and the elastic member 9 is contracted, a plurality of ridges 11 are formed. Although not shown, the back body 52 is also formed by laminating the inner layer pleat sheet 41 and the outer layer pleat sheet 42, so that a plurality of ridges 11 are formed as with the front body 51. The concavo-convex pattern of the inner layer pleat sheet 41 and the outer layer pleat sheet 42 and the ridge 11 extend substantially orthogonally in the vertical direction and extend substantially linearly in the vertical direction. The concavo-convex pattern of the inner layer pleat sheet 41 and the outer layer pleat sheet 42 and the ridge 11 are arranged at substantially equal intervals in the trunk periphery direction. Further, the concave / convex pattern of the inner layer pleated sheet 41 and the outer layer pleated sheet 42 has convex portions and concave portions formed alternately and continuously in a direction parallel to the waist opening 7.

  In the present embodiment, as shown in FIG. 2, the front body 51 and the back body 52 are joined at a predetermined joint 6 to have a waist opening 7 and a pair of leg openings 8. Although the disposable diaper formed in a pants type is demonstrated, in this invention, it is not limited to this. For example, you may use for the unfoldable disposable diaper 1A which can be worn by latching the front body 51 and the back body 52 with a locking member etc. as shown in FIG.1 (B). Further, for example, a locking member such as a hook-and-loop fastener that can be re-locked as used in a deployable disposable diaper at a predetermined joint 6 of the front body 51 and the back body 52 of a disposable diaper formed in a pants shape. The pants-type disposable diaper can be easily unlocked, and the pant-type disposable diaper can be used for a disposable diaper that can be deployed and re-locked.

  Furthermore, in this invention, the leak-proof wall formed using the elastic member 9 and a leak-proof sheet, what is called leg gathers (not shown) is arrange | positioned along the both ends of the width direction of the absorber 3 of a disposable diaper. Also good. Specifically, a leak-proof sheet is provided so as to extend in the width direction of the absorber 3 from between the absorbent body 3 and the chassis 5 or the liquid-impermeable back sheet 2, and the width-direction end of the leak-proof sheet At least one elastic member 9 may be disposed in the portion and fixed with a hot melt adhesive or the like. The leak-proof sheet may be in a state of extending in the width direction of the absorbent body 3, and by folding back in the center direction in the width direction of the absorbent body 3, the folded portion is the skin contact surface of the absorbent body 3. It may be arranged on the side.

  As shown in FIGS. 1 (A) and 2, the disposable diaper main body has a waist opening 7 and a pair of leg openings as the front body 51 and the back body 52 are joined at a predetermined joint 6. 8 is formed into a pants shape.

  In addition, although the liquid-impermeable back sheet 2 is arrange | positioned at a wearer's non-skin contact surface side, in this invention, it is not restricted to this, Between the absorber 3 and the chassis 5, or the chassis 5 May be provided between the sheets in the case of being formed from a plurality of sheets.

  Here, the liquid-permeable top sheet 1 and the absorber 3 are joined so that each is bonded by a hot melt adhesive. Moreover, the liquid-permeable top sheet 1 and the absorber 3 and the chassis 5 are joined so that each is bonded by a hot melt adhesive. Similarly, the chassis 5 and the liquid-impermeable back sheet 2 are joined so that each is pasted by a hot melt adhesive.

Examples of the coating pattern for hot melt bonding include spiral coating, control seam coating, coater coating, curtain coater coating, and summit gun coating. The basis weight of the adhesive in hot melt bonding is preferably 1 g / m ² to 30 g / m ² , and more preferably 3 g / m ² to 10 g / m ² . In the case of a pattern in which the adhesive is coated in a linear shape, the wire diameter is preferably 30 μm to 300 μm.

  The front body 51 and the back body 52 are intermittently joined at the joint 6 by ultrasonic sealing. Moreover, as another joining method in a joining part, joining by a heat seal, a hot-melt adhesive agent, etc. can be illustrated.

  As shown in FIG. 1A and FIG. 2, the disposable diaper main body has a plurality of thread-like elastic members 9 arranged in the peripheral region of the waistline opening 7. The elastic member 9 may be a belt-shaped member. The elastic member 9 may be an elastic sheet having elasticity such as a stretchable nonwoven fabric (such as a nonwoven fabric formed from a mixed fiber of polyurethane and polypropylene) or a stretchable film.

  In the disposable diaper of the present invention, the chassis 5 includes an outer member 4 in which an inner layer pleated sheet 41 and an outer layer pleated sheet 42 are laminated via an elastic member 9. 3A is a plan view of the inner pleated sheet 41 or the outer pleated sheet 42, and FIG. 3B is a cross-sectional view taken along the line X-X ′ of FIG. As shown in FIG. 3B, the inner layer pleated sheet 41 and the outer layer pleated sheet 42 have a concavo-convex pattern shape, and have convex portions (ridges) 12 and concave portions 13.

  Here, the pleated sheet refers to a sheet having a concavo-convex pattern (arch-shaped ridge). The inner layer pleated sheet 41 is provided on the skin contact surface side, and the outer layer pleat sheet 42 is provided on the non-skin contact surface side. It should be noted that any one of the inner layer pleated sheet 41 and the outer layer pleated sheet 42 may have an uneven pattern.

  The inner layer pleated sheet 41 and the outer layer pleated sheet 42 will be described in detail later, but can be obtained by pressing with a shaping roll. The area | region 15 squeezed with the shaping roll consists of the shaping area | region 16 shaped with the shaping roll, and the groove area | region 17 of the plane pattern which is not shaped with the shaping roll. It is sufficient that at least one groove region 17 is provided in the inner layer pleat sheet 41 and the outer layer pleat sheet 42. As shown in FIG. 3A, the groove regions 17 are alternately formed with the shaping regions 16 at regular intervals. You may make it have.

  By having the groove region 17, a stretch stop region is formed. For this reason, it is possible to always facilitate the formation of a fine concavo-convex pattern having the convex portions 12 and the concave portions 13 at regular intervals in the shaping region 16. Further, the external member 4 is obtained by applying an adhesive to the stretched elastic member 9 and bonding it to the groove region 17. Although the width | variety of the groove | channel area | region 17 can be suitably changed according to a use purpose etc., it is preferable that it is 0.5 mm-3 cm, and it is more preferable that it is 1-5 mm. When the width of the groove region 17 is less than 0.5 mm, the convex portion 12 of the shaping region 16 is crushed, so that a concave / convex pattern cannot be formed and it is difficult to join the elastic member 9. On the other hand, if the width of the groove region 17 exceeds 3 cm, the ratio of the entire groove region 17 having no uneven pattern increases.

  An end groove region 14 is provided at each end in the width direction of the inner layer pleat sheet 41 and the outer layer pleat sheet 42. You may make it join via the edge part groove | channel area | region 14. FIG. The width of the end groove region 14 can be appropriately changed according to the purpose of use and the like, and is more preferably 5 mm or more. Note that the end groove region 14 may be omitted as necessary.

  The method of joining the elastic member 9 to the groove region 17 of the inner layer pleat sheet 41 and the outer layer pleat sheet 42 can be appropriately changed according to the purpose of use, but the shrinkage of the inner layer pleat sheet 41 and the outer layer pleat sheet 42 itself is reduced. For example, V slit coating, Ω coating, and control seam coating are performed from the viewpoint of facilitating the formation of a uniform ridge 11 without hindering and the necessity of aligning the adhesive coating position with the elastic member 9. It is preferable to join the elastic member 9 by a coating method that can be applied directly to the elastic member 9 such as a work.

  Although the width | variety of the shaping area | region 16 which has a fine uneven | corrugated pattern can be suitably changed according to the use purpose etc. of a disposable diaper main body or a sheet | seat member, it is preferable that it is 2 mm-10 cm, and it is 3-9 mm. Is more preferable. If the width of the shaping region 16 is less than 2 mm, the convex portion 12 of the concavo-convex pattern is crushed and the shape of the concavo-convex pattern cannot be maintained. On the other hand, when the width of the shaping region 16 exceeds 10 cm, the inner layer pleated sheet 41 and the outer layer pleated sheet 42 are stretched, and the shape of the uneven pattern cannot be maintained.

  Although the height of the convex part 12 in the uneven | corrugated pattern which it has in the shaping area | region 16 can be suitably changed according to the use purpose etc. of a disposable diaper main body or a sheet | seat member, it is preferable that it is 0.5-5 mm, More preferably, it is 1 to 3 mm. When the height of the convex portion 12 is less than 0.5 mm, the cushioning property is inferior, and an uncomfortable feeling may be caused at the time of wearing. On the other hand, when the height of the convex portion 12 exceeds 5 mm, the rigidity of the convex portion 12 is excessively increased, and a sense of incongruity is caused at the time of wearing, and adhesion at the time of wearing is weakened.

  An interval between the convex portion 12 of the concave-convex pattern and the nearest convex portion 12 (hereinafter referred to as “interval between the convex portions 12”) can be appropriately changed according to the purpose of use of the disposable diaper main body or the sheet member. However, it is preferable that it is 0.5-5 mm. If the pitch is less than 0.5 mm, the convex portion 12 is crushed and the shape of the concave-convex pattern cannot be maintained. On the other hand, if the pitch exceeds 5 mm, the recess 13 comes into contact with the skin, and cushioning properties cannot be obtained.

  The nonwoven fabric used for the inner layer pleated sheet 41 and the outer layer pleated sheet 42 can be appropriately changed according to the purpose of use. For example, spunbond nonwoven fabric, meltblown nonwoven fabric, heat roll nonwoven fabric, spunbond nonwoven fabric and meltblown nonwoven fabric. Various known nonwoven fabrics such as a combined SMS nonwoven fabric, air-through nonwoven fabric, spunlace nonwoven fabric, and airlaid nonwoven fabric can be used, and these may be used alone or in combination. It is more preferable to use an air-through nonwoven fabric, a heat roll nonwoven fabric, a spunlace nonwoven fabric, a spunbonded nonwoven fabric, or a melt blown nonwoven fabric in order to form a flexible wrinkle that is beautiful to the eye and feels good.

  Although the material of the fiber which comprises the nonwoven fabric used for the inner-layer pleat sheet 41 and the outer-layer pleat sheet 42 can be appropriately changed according to the purpose of use, for example, various known fibers such as polyethylene, polypropylene, polyester, acrylic, etc. These may be used, and may be used alone or in combination. Further, the inner layer pleated sheet 41 and the outer layer pleated sheet 42 may be made of different materials, and may have a single layer structure or a multilayer structure.

The basis weight of nonwoven fabric used for the inner layer pleated sheet 41 and the outer layer pleated sheet 42 is preferably 5 to 50 g / ^{m 2,} and more preferably 10 to 20 g / ^{m 2.} If the basis weight of the nonwoven fabric is less than 5 g / m ² , there is a possibility that a portion where the strength is reduced due to intense formation unevenness and tearing. On the other hand, when the basis weight of the nonwoven fabric exceeds 20 g / m ² , the air permeability is hindered, and if it is worn for a long time, it may be steamed.

  The elongation of the nonwoven fabric used in the inner pleated sheet 41 and the outer pleated sheet 42 is preferably 40 to 120%. If the degree of elongation of the nonwoven fabric is less than 40%, tearing may occur when the concave / convex pattern is formed in the pleated sheet manufacturing method described later. On the other hand, if the elongation of the non-woven fabric exceeds 120%, it will be stretched even if it is squeezed in the method for producing a pleated sheet described later, so that the shape of the uneven pattern cannot be maintained.

  FIG. 4 is a view showing a state in which the inner layer pleat sheet 41 and the outer layer pleat sheet 42 are laminated via the elastic member 9 in a stretched state, and FIG. 5 shows the inner layer pleat sheet 41 and the outer layer pleat sheet 42. It is the figure which laminated | stacked via the elastic member 9 of the extended state, and showed the state which the elastic member 9 contracted.

  From FIG. 4, even when the elastic member 9 is in a contracted state, the uneven pattern is formed on the inner pleat sheet 41 on the skin contact surface side and the outer pleat sheet 42 on the non-skin contact surface side. A gap is formed between the waistline opening 7 and the gap continuously and substantially straightly extends from the crotch region toward the waistline opening 7 in the longitudinal direction. It can escape to the exterior of a disposable diaper from the trunk periphery opening part 7. FIG. Moreover, in this disposable diaper, since the convex part 12 and the heel 11 which contact | abutted to the circumference | surroundings of a wearer are hard to bend and these convex part 12 and the heel 11 become a cushion, the convex part 12 and the heel 11 become a wearer's skin. There is no local pressure.

  When laminating through the elastic member 9, it is preferable to laminate the inner layer pleated sheet 41 and the outer layer pleated sheet 42 in a state where the elastic member 9 is stretched. When the elastic member 9 is contracted as shown in FIG. 5 by laminating the pleated sheets with the elastic member 9 extended, the external member 4 including the elastic member 9, the inner layer pleated sheet 41, and the outer layer pleated sheet 42. Forms a flange 11 according to the curvature of the elastic member 9 (the flange 11 is a portion surrounded by a circular frame in FIG. 5). By the heel 11, the adhesiveness to a wearer increases and the disposable diaper which is excellent in cushioning properties can be provided. Even when the external member 4 is in an expanded state and a contracted state, it is in contact with the skin contact surface in the vicinity of the apex of the convex portion 12, and therefore the skin is affected only by the rigidity of the inner layer pleated sheet 41 alone. A person can feel the cushioning property without feeling uncomfortable and can use the disposable diaper of the present invention.

  The height H of the flange 11 can be appropriately changed according to the purpose of use of the external member 4 or the sheet member, but is preferably 1 to 6 mm. If the height H of the ridge 11 is less than 1 mm, cushioning properties cannot be obtained. On the other hand, when the height H of the heel 11 exceeds 6 mm, the rigidity becomes high, and the sense of contact with the skin becomes worse. The height H of the flange 11 indicates the distance from the concave portion to the convex portion of the elastic member 9.

  4 and FIG. 5, the shape of the concave / convex pattern of the inner layer pleat sheet 41 and the outer layer pleat sheet 42 is the same, but the shape of the concave / convex pattern of the inner layer pleat sheet 41 and the outer layer pleat sheet 42 is different as shown in FIG. It may be. For example, as shown in FIG. 6, it is also possible to use the external member 4 in which the inner layer pleated sheet 41 and the outer layer pleated sheet 42 having a concavo-convex pattern having different heights are stacked via the elastic member 9 in an expanded state. it can. In such an external member 4, when the elastic member 9 contracts, the flange 11 is formed so as to draw a curve in a direction where the height of the convex portion 12 is small. If such an external member 4 is used for the trunk periphery opening part 7, for example, the disposable diaper along a wearer's body can be provided more. In addition, when using this external member 4, the height of the convex part 12 of the inner layer pleat sheet 41 (skin contact surface side) is higher than the height of the convex part 12 of the outer layer pleat sheet 42 (non-skin contact surface side). It is preferable to join so that it may become small.

  Moreover, as shown in FIG. 7, the space | interval between the convex parts 12 of the uneven | corrugated pattern of the inner-layer pleat sheet | seat 41 and the outer-layer pleat sheet | seat 42 may differ. As shown in FIG. 7, the inner pleated sheet 41 having a short interval between the convex portions 12 of the concavo-convex pattern and the outer pleat sheet 42 having a long interval between the convex portions 12 of the concavo-convex pattern were laminated via the elastic member 9 in an extended state. An external member 4 can also be used. In such an external member 4, when the elastic member 9 contracts, the flange 11 is formed so as to draw a curve with a smaller interval between the convex portions 12 of the concavo-convex pattern. When such an external member 4 is used, on the skin contact surface side, the contact area with the skin can be reduced by fine wrinkles, and the effect of reducing the sense of incongruity can be improved. The space between the parts 12 contracts in the shaped region in conjunction with the contraction of the elastic member 9, the skin contact surface side is flexible, and the non-skin contact surface side has the ridges 11 regularly arranged. It is possible to provide a disposable diaper having excellent aesthetics.

  The form of the elastic member 9 is not particularly limited and can be appropriately changed according to the purpose of use. Examples thereof include a band form, a sheet form, a net form, and a thread form, and these single forms are disposable. The diaper main body may be configured, but the disposable diaper main body may be configured in a plurality of forms.

  The pitch (interval) for interposing the elastic member 9 can be appropriately changed according to the purpose of use of the disposable diaper main body or the sheet member, but is preferably 1 mm to 30 mm, and more preferably 3 to 9 mm. preferable. When the pitch is less than 1 mm, the linear pressure increases, and rubber marks are given to the wearer. On the other hand, if the pitch exceeds 30 mm, the elastic member 9 cannot be affected, the surface pressure on the wearer is lowered, and the disposable diaper is displaced. The elastic member 9 is preferably intervened in the groove region 17 as described above. Therefore, it is preferable that the pitch for interposing the elastic member 9 and the width of the shaping region 16 are the same.

  Although the thickness of the elastic member 9 can be appropriately changed according to the purpose of use of the disposable diaper main body and the sheet member, it is preferably 310 to 1440 denier, and more preferably 420 to 940 denier. If the thickness of the elastic member 9 is less than 310 denier, it is necessary to increase the number of elastic members 9 in order to increase the magnification in order to generate stress. For this reason, the line pressure is increased and rubber marks are given to the wearer. On the other hand, when the thickness of the elastic member 9 exceeds 1440 denier, the linear pressure is excessively increased and rubber marks are given to the wearer.

  The material of the elastic member 9 can be appropriately changed according to the purpose of use, etc., for example, synthetic rubber such as styrene-butadiene, butadiene, isoprene, neoprene, natural rubber, EVA, SIS, SEBS, SEPS, stretchability Various known materials such as polyolefin and polyurethane can be used, and these may be used alone or in combination.

  The expansion ratio of the elastic member 9 can be appropriately changed according to the purpose of use of the disposable diaper main body and the sheet member, but is preferably 1.5 to 5 times, and preferably 1.8 to 3.5 times. More preferably. If the expansion ratio is less than 1.5, it is impossible to form the ridge 12 on the outer member 4 even if the inner layer pleated sheet 41 and the outer layer pleated sheet 42 are laminated with the elastic member 9 stretched. On the other hand, if the expansion ratio exceeds 5 times, the rigidity of the heel 12 is increased, the adhesion of the wearer to the skin is poor, the contact feeling becomes hard, and the touch becomes poor.

  According to the disposable diaper of the present embodiment, the inner layer pleat sheet and the outer layer pleat sheet, both of which have a concavo-convex pattern, are laminated on the stretched elastic member, so that a large number of wrinkles occur when the elastic member contracts. Arise. As a result, the skin of the wearer is only affected by the rigidity of the external member alone because the convex part of the concavo-convex pattern is in contact with the wearer's skin regardless of whether the external member is expanded or contracted. Accordingly, it has become possible to provide a disposable diaper having excellent cushioning properties and improved in close contact with the wearer. Moreover, since it has many uneven | corrugated patterns and ridges, the clearance gap between a wearer and a disposable diaper can be reduced, and leakage of excrement etc. can be prevented now. Furthermore, since it has many concavo-convex patterns and ridges 11, the surface area is increased, and the heat insulation is improved.

  Further, when the elastic member 9 is contracted, a plurality of ridges 11 are formed. The ridges 11 may be alternately arranged with the upper ridge 11 and the lower ridge 11 via the elastic member 9. At this time, the pressure on the skin contact surface side may be uniform, and the touch may be improved.

[Sheet material]
The external member 4 in which at least one pleat sheet (inner layer pleat sheet 41 or outer layer pleat sheet 42) as described above is laminated via the stretched elastic member 9 can be used as a sheet member other than disposable diapers. it can. Since such a sheet member has a good contact feeling and excellent cushioning properties, it can be used, for example, in disposable diapers, sanitary products, and the like.

Here, the softness of the sheet member and the external member 4 of the present invention can be expressed by bending hardness and bending recovery rate. The bending hardness of the present invention is preferably 0.02 to 0.04 × [10 N · m ² / m] K, and the bending recovery rate is 0.02 to 0.05 [10 N · m ² / m. ] K is preferred.

  By using the above-mentioned external member other than the disposable diaper, a sheet member having excellent cushioning properties can be provided.

[Pleated sheet manufacturing method]
FIG. 8 is a diagram showing an example of a method for manufacturing a pleated sheet. For convenience of explanation, the case where the inner layer pleated sheet 41 is manufactured will be described. However, the outer layer pleated sheet 42 can be manufactured in the same manner, and the present invention is not limited thereto.

  The inner layer pleated sheet 41 can be manufactured by pressing the sheet 10 with the shaping roll 18 as shown in FIG. The shaping roll 18 has a toothed area 181 having a plurality of teeth of a certain size and a planar grooved area 182, and the toothed area 181 and the grooved area 182 are located in the shaping roll 18. It is installed alternately. When the inner layer pleated sheet 41 (sheet 10) on which the uneven pattern is not formed is passed through the pair of shaping rolls 18 and the shaping roll 18 is rotated, the portion squeezed in the toothed region 181 is a tooth A shaping region 16 having a concavo-convex pattern is formed at every interval. A groove region 17 is formed from the grooved region 182. The width and the like of the toothed region 181 and the grooved region 182 are set so that the width and the like of the shaping region 16 and the grooved region 17 are within the ranges as described above.

  The shaping roll 18 is covered with a heat insulating material such as a heat insulating tape in the grooved region 182 so that heat is not transmitted to other than the toothed region 181. By applying heat only to the shaping region 16 of the inner layer pleated sheet 41, damage to the inner layer pleated sheet 41 due to heat can be suppressed, and deformation of the inner layer pleated sheet 41 such as entering into the width or twisting can be prevented.

  According to the method for manufacturing a pleated sheet of the present embodiment, it is possible to prevent deformation such as entering the width of the material and kinking, and it is possible to efficiently manufacture a pleated sheet on which an uneven pattern is formed. .

  Examples of the present invention will be described below. However, these examples are merely examples for suitably explaining the present invention, and do not limit the present invention.

[Production of External Member 4]
Polypropylene spunbond (PPSB) of 19 g / m ² and SMS nonwoven fabric 15 g / m ² , the height of the convex portion 12 is 1 mm, the pitch of the concave and convex pattern is 1.3 mm, the width of the shaping region 16 is 10 mm, the groove The pleated sheet was obtained by squeezing with the shaping roll 18 so that the width of the region was 5 mm and each width of the end groove region 14 was 5 mm.

  After that, the external member 4 was manufactured by laminating it in the groove region 17 of the pleated sheet prepared in advance through the elastic member 9 of 620 denier in a state of being expanded twice as compared with the normal contraction. The pitch of the elastic members 9 was 5 mm (hereinafter referred to as sample 1).

[Bending characteristics test]
KES for measuring bending stiffness and hysteresis by setting a specimen 1 of 100 mm × 100 mm to bend perpendicularly to the MD direction on a nonwoven fabric bending property tester (KES FB-2 manufactured by Kato Tech Co., Ltd.) A test was conducted. The CD direction was also measured in the same manner.

As a comparative example with Sample 1, Comparative Example 1 and Comparative Example 2 were similarly measured for bending stiffness and hysteresis (bending recovery rate). In Comparative Example 1, and 19 g / ^{m 2} and SMS nonwoven 15 g / ^{m 2} of PPSB, by joining the elastic member 9 of 620 denier in a state of being stretched to twice than the normal contractions, the further embossing process Made by doing. Moreover, the comparative example 2 was produced by joining PPSB with 19 g / m ² and SMS nonwoven fabric 15 g / m ² and the elastic member 9 of 620 denier in a state where the PPSB was stretched twice as much as normal shrinkage.

Table 1 below shows the results of the KES test.

  From Table 1, it can be seen that the bending stiffness of Sample 1 shows the smallest value and is softer than Comparative Example 1 and Comparative Example 2. Similarly, the sample 1 shows the smallest value of the hysteresis, and it can be seen that the recovery rate is good as compared with Comparative Example 1 and Comparative Example 2. Thereby, it turns out that the sample 1 is excellent in cushioning properties.

[Sensitivity test]
Sample 1 and Comparative Example 1 and Comparative Example 2 were touched by a tester, and each absolute evaluation was performed. The results of the sensory test are shown in Table 2 below.

  As can be seen from Table 2, Sample 1 was evaluated as being softer than Comparative Example 1 and Comparative Example 2. Therefore, it can be seen that the sample 1 is more comfortable to touch than the comparative example 1 and has excellent cushioning properties.

(A) The front view of the disposable diaper of this invention, (B) The elements on larger scale of the front body. It is a perspective view of the disposable diaper of this invention. (A) Top view of a pleat sheet, (B) It is sectional drawing of a X-X 'line | wire. It is the figure which showed the laminated structure of the state which the elastic member is extending | stretching. It is the figure which showed the laminated structure of the state which the elastic member has shrunk. It is the figure which showed the laminated structure at the time of laminating | stacking the pleat sheet | seat from which the height of a convex part differs. It is the figure which showed the laminated structure at the time of laminating | stacking the pleat sheet from which the period of an uneven | corrugated pattern differs. It is the figure which showed an example of the manufacturing method of the pleat sheet | seat of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid-permeable top sheet 2 Liquid-impermeable back sheet 3 Absorber 4 External member 41 Inner layer pleated sheet (inner layer sheet)
42 Outer layer pleated sheet (outer layer sheet)
5 Chassis 51 Front Body 52 Back Body 53 Crotch 6 Joint 7 Waist Opening 8 Leg Opening 9 Elastic Member 10 Sheet 11 １２ 12 皺 (Convex)
13 recess 14 end groove area 15 pressed area 16 shaping area 17 groove area 18 shaping roll 181 toothed area 182 grooved area

Claims (18)

A chassis comprising a front body and a back body, having a waist opening and a pair of left and right leg openings in the crotch;
A liquid permeable topsheet disposed on at least a portion of the chassis;
A liquid-impermeable backsheet disposed on one side in the thickness direction of the liquid-permeable topsheet;
A disposable diaper comprising a liquid-retaining absorbent disposed between the liquid-permeable top sheet and the liquid-impermeable back sheet,
Among the chassis, between the trunk periphery opening and the leg periphery opening, one or a plurality of layers disposed between the inner layer sheet, the outer layer sheet, and the inner layer sheet and the outer layer sheet. An external member provided with a thread-like or belt-like elastic member,
At least one of the inner layer sheet and the outer layer sheet has a concavo-convex pattern continuously formed in a direction parallel to the trunk periphery opening, and the elastic member follows a direction in which the concavo-convex pattern is formed. Disposable diapers characterized by being arranged like this.   The disposable diaper according to claim 1, wherein the outer member is formed by laminating the inner layer sheet and the outer layer sheet via an elastic member in an expanded state.   The disposable diaper according to claim 1 or 2, wherein in the external member, a large number of ridges are formed along the concave-convex pattern when the elastic member contracts.   The disposable diaper according to claim 3, wherein the height of the heel is 1 to 6 mm.   The disposable diaper according to any one of claims 1 to 4, wherein a height of a convex portion of the concavo-convex pattern of the inner layer sheet and the outer layer sheet is 0.5 to 5 mm.   The said inner layer sheet and the said outer layer sheet | seat have at least 1 shaping area in which the said uneven | corrugated pattern is formed, and at least 1 groove area | region in which the plane pattern is formed. Disposable diapers.   The disposable diaper according to claim 6, wherein a width of the shaping region is 2 mm to 10 cm, and a width of the groove region is 0.5 mm to 3 cm.   The disposable diaper according to any one of claims 1 to 7, wherein the elastic member is laminated by applying an adhesive and bonding the elastic member to the groove region.   The disposable diaper according to any one of claims 1 to 8, wherein the external member has an end groove region and is joined via the end groove region. The inner layer sheet and the basis weight of the outer layer sheet, a disposable diaper according to any one of claims 1-9 which is 5 to 50 g / m ^2.   The disposable diaper according to any one of claims 1 to 10, wherein heights of convex portions of the inner layer sheet and the outer layer sheet are the same.   The disposable diaper in any one of Claim 1 to 10 from which the height of the convex part of the said inner layer sheet and the said outer layer sheet differs.   The disposable diaper according to any one of claims 1 to 12, wherein an interval between the convex portions of the inner layer sheet and the outer layer sheet is the same.   The disposable diaper according to any one of claims 1 to 12, wherein an interval between the convex portions of the inner layer sheet and the outer layer sheet is different. A first sheet, a second sheet, and one or more thread-like or belt-like elastic members disposed between the first sheet and the second sheet, and at least the first sheet The sheet is a sheet member formed in an uneven shape along the longitudinal direction,
In the first sheet, a plurality of convex portions and a plurality of concave portions are alternately and continuously formed in the longitudinal direction,
The elastic member is disposed along the longitudinal direction,
The plurality of recesses are joined to the stretched elastic member.   The sheet member according to claim 16, wherein a plurality of wrinkles are formed when the elastic member contracts.   Squeezing the sheet between a pair of shaping rolls having at least one toothed region and at least one grooved region to produce a pleated sheet formed in an uneven shape along the longitudinal direction. A manufacturing method of a pleated sheet characterized by the above. The pleated sheet manufacturing method according to claim 17, wherein the grooved region is covered with a heat insulating material.

Images