JP6994913B2 - Disposable wear items - Google Patents

Description

The present invention relates to disposable wear articles.

A liquid-absorbing structure having a lateral and vertical direction, a crotch region located between the front waist region, the rear waist region, the anterior-posterior waist region, and an absorbent core extending from the crotch region to the front waist region. Disposable wear items, including the body and waist openings, are known. For example, in Patent Document 1, the outer sheet defining the front waist region has a folded portion, and a portion of the outer sheet located on the skin facing surface side and a portion located on the non-skin facing surface side thereof. It is disclosed to have a thread-like elastic material (waist elastic body) located between the portions.

Japanese Unexamined Patent Publication No. 2013-138795

In the worn article disclosed in Patent Document 1, since the thread-like waist elastic body is located on the waist opening edge side, the portion where the waist elastic body is present is strongly pressed against the wearer's skin. However, when the wearer moves his / her legs, the liquid-absorbing structure may move in the vertical direction, and the waist opening edge in the anterior waist region may move in the vertical direction as the liquid-absorbing structure moves. .. When the waist opening edge is displaced in the vertical direction and the wearer moves the leg, the liquid absorbing structure moves in the vertical direction, and the waist opening edge moves vertically as the liquid absorbing structure moves. There was a risk that it would move in the direction and the edge of the waist opening would turn over.

An object of the present invention is to provide a worn article capable of preventing the waist opening edge side from being turned over.

The present invention for solving the above-mentioned problems has a lateral direction and a vertical direction, and has a front waist region, a rear waist region, a crotch region located between the front and rear waist regions, and a crotch region to the front waist region. With respect to a disposable wear article comprising a liquid absorbing structure having an absorbent core extending to and a waist opening.

In the present invention, the front waist region includes at least two sheets made of a fibrous non-woven fabric, a first waist elastic body located at least at the waist opening edge, a front end edge of the liquid absorbing structure, and the absorbent core. A second waist elastic body located between the front end of the body, a first elastic region having elasticity due to the elastic sheet which is the first waist elastic body, and the first waist elastic body and the second waist elastic body. Further having a second elastic region having elasticity, the first elastic region is located between the waist opening edge and the front end edge of the liquid absorbing structure, and the second elastic region is said. Located on the crotch region side of the first elastic region, the lateral elongation stress of the second elastic region is larger than the lateral elongation stress of the first elastic region, and the rear waist region is inside and outside. It has a posterior elastic region formed from a thread-like or ribbon-shaped posterior waist elastic body arranged between the inner and outer layer sheets and extending from the waist opening edge to the posterior end edge of the absorbent core. The rear waist elastic body located closest to the waist opening edge side of the rear waist elastic body is characterized to be located adjacent to the bent portion of the outer layer sheet forming the waist opening edge.

In one of the embodiments of the worn article according to the present invention, the second elastic region is defined by the second waist elastic body having a plurality of threads or ribbons extending in the lateral direction. As a result, it is possible to locally increase the elastic force at the location where the waist elastic body is present and prevent the liquid absorbing structure from being displaced.

In one of the other embodiments of the worn article according to the present invention, the anterior waist region has a first portion extending in the vertical direction and a first portion having a lower rigidity than the first portion and deviating from the first portion. It has two parts. As a result, since the first portion having higher rigidity than the second portion extends in the vertical direction, the first portion becomes a resistance when the waist opening edge side is bent, and it is possible to prevent the waist opening edge side from turning over.

In one of the other embodiments of the worn article according to the present invention, the first part is a part where at least one of the two sheets and the elastic sheet are fixed, and the second part is 2 The sheet is a portion in which the sheet and the elastic sheet are not fixed, the first portion is arranged at intervals in the lateral direction, and the second portion is located between the two first portions. The part is located. As a result, the elastic sheet contracts laterally and the second part swells away from the wearer's skin, so that the contact area between the skin-facing surface in the front waist area and the wearer's skin should be reduced. It is possible to prevent the waist opening edge side from turning over.

In one of the other embodiments of the worn article according to the present invention, the first portion is arranged at intervals in the vertical direction. As a result, in the vertical direction, the elasticity of the elastic sheet becomes laterally in the second portion located between one arbitrarily selected first portion and the other first portion adjacent to the first portion. It is possible to continuously suppress the deterioration of the fit of the worn article.

In one of the other embodiments of the worn article according to the present invention, the anterior waist region includes a central region located in the center of the lateral direction and a bilateral region located on both sides of the central region in the lateral direction. The distance between the first portion of the two-sided region in the lateral direction is larger than the distance between the first portion of the central region. As a result, it is possible to suppress the force of turning over the central region on the edge side of the waist opening and prevent the central region from turning over.

In one of the other embodiments of the worn article according to the present invention, the stretchable sheet has a seat center region located in the lateral center of the anterior waist region and both sides of the anterior waist region in the lateral direction. It has both sides of the sheet located in the center of the sheet, and has a stress reducing portion in the center of the sheet so that the elongation stress in the center of the sheet is smaller than the extension stress in the center of the sheet. As a result, the rigidity of the central area of the seat is smaller than the rigidity of both sides of the seat, so that it is possible to suppress the pressure on the abdomen when the abdomen is inflated when the abdomen is full, and it is possible to improve the comfort of wearing. can.

In one of the other embodiments of the worn article according to the present invention, the elastic sheet and the sheet are fixed to each other by a fixing portion extending in the vertical direction, and the waist opening edge in the front waist region is covered with the waist opening edge. It forms a non-existent area where there is no fixed part. As a result, it is possible to suppress an increase in the rigidity of the waist opening edge in the front waist region and improve the wearing comfort.

In one of the other embodiments of the worn article according to the present invention, the liquid absorbing structure has an inner surface sheet located on the skin facing surface side and an outer surface sheet located on the non-skin facing surface side. A front flap formed by the inner surface sheet and the outer surface sheet is located between the front end edge of the liquid absorbing structure and the front end edge of the absorbent core, and the second waist elastic body having a plurality of strips. Among them, the second waist elastic body closest to the waist opening edge in the vertical direction and the front end edge of the liquid absorbing structure are separated from each other. As a result, among the plurality of waist elastic bodies, the waist elastic body closest to the waist opening edge in the vertical direction and the front end edge of the liquid absorbing structure are separated from each other, so that it is local. It is possible to prevent the formation of highly rigid parts and improve the comfort of wearing.

In one of the other embodiments of the worn article according to the present invention, the anterior waist region is a first elastic body adjacent to the waist opening edge side of the anterior edge of the absorbent core and the crotch of the anterior edge. It has a second elastic body adjacent to the region side and a third elastic body adjacent to the crotch region side of the second elastic body, and has a contraction force of the first elastic body and a contraction force of the second elastic body. However, it is smaller than the contraction force of the third elastic body. This causes the vicinity of the anterior edge of the absorbent core to be pressed against the wearer's body with moderate force, and the portion between the anterior edge of the absorbent core and the anterior edge of the absorbent chassis rises away from the body. It is possible to prevent the front waist area from being displaced.

According to the disposable wear article according to the present invention, the front waist region is located between the waist opening edge and the front end edge of the liquid absorbing structure, and has a first elastic region elastic by the elastic sheet. The entire area of the first elastic region can be pressed against the wearer's skin by the stretching force of the sex sheet, and the first elastic region can be prevented from being locally pressed against the wearer's skin. As a result, even if the liquid absorbing structure moves in the vertical direction according to the movement of the wearer's legs, the first elastic region located on the waist opening edge side slides on the wearer's skin and the waist opening edge side is turned over. Can be prevented. In addition, since the second elastic region, which has a larger elongation stress than the first elastic region, is located between the front end edge of the liquid absorbing structure and the front end edge of the absorbent core, the liquid absorbing structure moves in the vertical direction. It is possible to suppress the movement and prevent the position of the worn item from shifting.

The drawings show specific embodiments of the invention according to the present disclosure, including not only the essential configurations of the invention, but also selective and preferred embodiments.
The perspective view of the disposable wear article (diaper) which concerns on this invention. Partial fracture development view of the diaper in a state where each elastic body is extended in the vertical direction and the horizontal direction of the diaper. Partially enlarged view of the front waist area. FIG. 3 is a cross-sectional view taken along the line IV-IV shown in FIG. Partially enlarged view of the rear waist area. FIG. 5 is a cross-sectional view taken along the line VI-VI shown in FIG. A partially enlarged view similar to FIG. 3 of the diaper of the first modification. FIG. 7 is a cross-sectional view taken along the line VIII-VIII shown in FIG. A partially enlarged view similar to FIG. 3 of the diaper of the second modification. A partially enlarged view similar to FIG. 3 of the diaper of the third modification. A partially enlarged view similar to FIG. 3 of the diaper of the fourth modification. A partially enlarged view similar to FIG. 4 of the diaper of the fifth modification.

The following embodiments include not only the essential configurations of the invention, but also selective and preferred configurations for the disposable wear articles (disposable diapers) shown in the drawings below.

Referring to FIGS. 1 to 6, the disposable diaper 10, which is an example of the disposable worn article in the present invention, has a horizontal direction X, a vertical direction Y, and a thickness direction Z orthogonal to each other (crossing), and a skin facing surface and skin. An annular elastic waist panel 11 having a non-skin facing surface located on the opposite side of the facing surface and extending in the waist direction, and an absorption chassis (liquid absorbing structure) attached to the skin facing surface side of the elastic waist panel 11. ) 12, the anterior waist region 13, the posterior waist region 14, and the crotch region 15 located between the anterior waist region 13 and the posterior waist region 14.

The elastic waist panel 11 has an elastic belt function that expands and contracts in the direction around the waist, and includes a front waist panel 16 that forms a front waist region 13 and a rear waist panel 17 that forms a rear waist region 14.

The front waist panel 16 has a substantially rectangular shape defined by an inner edge 16a, an outer edge 16b, and both side edges 16c, 16d extending from the inner edge 16a to the outer edge 16b. The rear waist panel 17 has an inner edge 17a, an outer edge 17b, first bilateral edges extending inward in the vertical direction Y from the outer edge 17b (both edges of the rear waist region) 17c, 17d, and a first. It has a substantially trapezoidal shape defined by the second side edges 17e and 17f extending diagonally inward in the vertical direction from the side edges 17c and 17d.

Both side edges 16c, 16d of the front waist panel 16 facing each other and the first side edges 17c, 17d of the rear waist panel 17 are overlapped with each other and connected by side seams 18 intermittently arranged in the vertical direction Y (for example, heat). The waist opening 19 and the pair of leg openings 20 are defined by being connected by various heat welding means such as embossing and sonic.

The front and rear waist panels 16 and 17 include inner layer sheets 21 and 22 located on the skin facing surface side and outer layer sheets 23 and 24 located on the non-skin facing surface side, respectively. The inner and outer layer sheets 21 to 24 are SMS (spunbond, meltblown, spunbond) fiber non-woven fabrics, spunbond fiber non-woven fabrics or air-through fiber non-woven fabrics, or plastic sheets, perforated plastic sheets and theirs having a mass of 10 to 30 g / m ² . A laminated sheet or the like can be used.

The outer layer sheets 23 and 24 have a main body portion 23a and 24a located on the non-skin facing surface and an extending portion 23b extending outward from the main body portions 23a and 24a in the vertical direction Y to form a part of the skin facing surface. , 24b, and bent portions 23c, 24c located between the main portions 23a, 24a and the extending portions 23b, 24b.

The front waist panel 16 is located between the inner layer sheet 21 and the main body portion 23a of the outer layer sheet 23, and has an elastic sheet 30 which is a first waist elastic body. The elastic sheet 30 extends from the waist opening edge 19a toward the crotch region 15.

The elastic sheet 30 includes, for example, a spunbonded nonwoven fabric, an air-through nonwoven fabric, and a needle punched nonwoven fabric made of elastic fibers (elastic filaments) having a mass of 10 to 40 g / m ² , more preferably 15 to 30 g / m ² . Etc., elastic fibrous nonwoven fabrics manufactured by various known manufacturing methods can be used. The elastic fiber is made of a thermoplastic elastomer, rubber, or the like as a raw material. In particular, when the thermoplastic elastomer is used as a raw material, melt spinning using an extruder is possible in the same manner as a normal thermoplastic resin. Further, the fibers thus obtained are easily heat-sealed and are suitable as a stretchable fibrous nonwoven fabric. Examples of the thermoplastic elastomer include styrene-based elastomers such as SBS (styrene / butadiene / styrene), SIS (styrene / isoprene / styrene), SEBS (styrene / ethylene / butadiene / styrene), and SEPS (styrene / ethylene / propylene / styrene). , Styrene-based elastomer, polyester-based elastomer, polyurethane-based elastomer can be mentioned. These can be used alone or in combination of two or more. The elastic sheet 30 may exhibit elasticity in only one direction (horizontal direction X), or may exhibit elasticity in two or more directions (horizontal direction X and vertical direction Y). The elongation ratio of the stretchable sheet 30 in the lateral direction X is 1.2 to 3.0 times, and in a specific embodiment, it is 2.5 times.

The front waist region 13 has an intermediate sheet 38 located between the inner layer sheet 21 and the main body portion 23a of the outer layer sheet 23. The rear waist panel 17 has an intermediate sheet 39 located between the inner layer sheet 22 and the main body portion 24a of the outer layer sheet 24.

The intermediate sheets 38 and 39 are formed of an impermeable fibrous nonwoven fabric, an impermeable and moisture permeable plastic film, or a laminated sheet thereof. For example, a figure of a character that is an animal is drawn on the intermediate sheets 38 and 39, and the figure can be visually recognized from the non-skin facing surface side. The figures drawn on the intermediate sheets 38, 39 may be various known decorative patterns, pictures, characters, symbols, or / and coloring.

The elastic sheet 30 and the intermediate sheet 38 are arranged so that the inner edge 30a of the elastic sheet 30 and the outer edge 38a of the intermediate sheet 38 are separated from each other in the vertical direction Y of the front waist region 13. (FIG. 4). reference). More specifically, in the vertical direction Y, the inner edge 30a of the elastic sheet 30 and the outer edge 38a of the intermediate sheet 38 are arranged so as to have a separation dimension L2. The separation dimension L2 is preferably, for example, 1.0 to 15.0 mm, preferably 5.0 to 10.0 mm.

Between the inner layer sheets 21 and 22 and the outer layer sheets 23 and 24 of the front and rear waist panels 16 and 17, a plurality of thread-like or ribbon-shaped front waist elastic bodies (second waist elastic bodies) 27 and rear waist elastic bodies 28 Are arranged so as to be expandable and contractible in the lateral direction X, and the front and rear waist panels 16 and 17 are elasticized at least in the lateral direction X.

The anterior waist elastic body 27 extends laterally along the waist opening edge 19a and overlaps with the elastic sheet 30. The anterior upper waist elastic body 27 is lateral between the anterior upper waist elastic body 27A and the inner end edge 16a. It has a front lower waist elastic body 27B that extends in direction X and does not overlap the elastic sheet 30. The posterior waist elastic body 28 extends laterally X along the waist opening edge 19a and laterally X between the posterior upper waist elastic body 28A and the posterior upper waist elastic body 28A and the inner end edge 17a. It has an elastic body 28B.

The posterior lower waist elastic body 28B is partially cut or removed at the central portion of the posterior waist region 14, and the posterior non-stretchable region 37 is defined. As described above, since the rear non-stretchable region 37 is located in the central portion of the rear waist region 14, the rear lower portion is located in the central portion of the absorption chassis 12 (central portion of the absorbent core 43) located on the inner surface of the rear waist panel 17. Since the contraction force of the waist elastic body 28B is directly applied to form gathers and the like, it is possible to suppress a decrease in absorption performance due to the action of the contraction force.

The front waist elastic body 27 and the rear waist elastic body 28 include, for example, a thread-like or ribbon elastic material having a fineness of 350 to 1240 dtex and arranged in a state of being stretched 1.5 to 3.5 times. Can be used. Conditions such as the fineness of the front waist elastic body 27 and the rear waist elastic body 28, the elongation ratio, and the separation dimension (pitch) between the elastic bodies can be changed as appropriate, but they are stably worn on the wearer's body. Therefore, the conditions of each elastic body may be set so that the extension force of the elastic region of the front and rear upper waist elastic bodies 27A and 28A is larger than that of the expansion and contraction region of the front and rear lower waist elastic bodies 27B and 28B. preferable.

In the front waist region 13, the front upper waist elastic body 27a closest to the waist opening edge 19a in the vertical direction Y among the plurality of front upper waist elastic bodies 27A and the front end edge 53a of the absorption chassis 12 are separated from each other. (See Fig. 4). In the present embodiment, the front upper waist elastic body 27a and the front end edge 53a of the absorption chassis 12 have a separation dimension L1. The separation dimension L1 is, for example, 1.0 to 20.0 mm, preferably 5.0 to 10.0 mm.

In the front waist region 13, of the plurality of front lower waist elastic bodies 27B, the front lower waist elastic body 27b closest to the waist opening edge 19a in the vertical direction Y is separated from the elastic sheet 30 and the intermediate sheets 38 and 39. It is placed in the area where it is.

The inner and outer layer sheets 21 and 23 of the front waist area 13 and the inner and outer layer sheets 22 and 24 of the rear waist area 14 are not coated with the hot melt adhesive on their inner surfaces, except for the joint portion by the side seam 18. They are bonded to each other only via an adhesive such as a hot melt adhesive applied to the front waist elastic body 27 and the rear waist elastic body 28, respectively. The hot melt adhesive may be applied to the portions facing the inner and outer layer sheets 21 to 24 on the entire circumference of the front waist elastic body 27 and the rear waist elastic body 28.

The extending portions 23b and 24b of the outer layer sheets 23 and 24 and the absorbing chassis 12 are fixed by adhesives 61a and 61b such as a hot melt adhesive applied to their inner surfaces (see FIGS. 4 and 6). The absorption chassis 12 and the inner layer sheets 21 and 22 are fixed by adhesives 62a and 62b such as a hot melt adhesive applied to their inner surfaces (see FIGS. 4 and 6). The inner layer sheets 21 and 22 and the intermediate sheets 38 and 39 are fixed by adhesives 63a and 63b such as a hot melt adhesive applied to their inner surfaces (see FIGS. 4 and 6). In the front waist region 13, the elastic sheet 30 and the main body portion 23a of the outer layer sheet 23 are fixed by an adhesive (fixing portion) 64a such as a hot melt adhesive applied to their inner surfaces (see FIG. 4). .. A non-fixed region 65 in which the adhesive (fixed portion) 64a does not exist is formed on the waist opening edge 19a of the front waist region.

As shown in FIG. 3, the front waist region 13 is laterally formed by a first elastic region 71 having elasticity in the lateral direction X formed only by the elastic sheet 30, the elastic sheet 30, and the front upper waist elastic body 27A. It has a second elastic region 72 having elasticity in the direction X and a third elastic region 73 having elasticity in the lateral direction X formed only by the front lower waist elastic body 27B.

The first elastic region 71 is located between the waist opening edge 19a and the front end edge 53a of the absorption chassis 12. The second elastic region 72 is located on the crotch region 15 side of the first elastic region 71. The third elastic region 73 is located on the crotch region 15 side of the second elastic region 72. Due to the configuration of the first elastic region 71 and the second elastic region 72, the elongation stress in the lateral direction X of the second elastic region 72 is larger than the elongation stress in the lateral direction X of the first elastic region 71.

Specifically, the elongation stress of a predetermined width in the lateral direction X of the front waist region 13 is 0.01 to 0.04 N / mm in the first elastic region 71 (more than 0.01 and 0.04 N / mm). Small), the second elastic region 72 is 0.04 to 0.10 N / mm (0.04 or more and smaller than 0.10 N / mm), and the third elastic region 73 is 0.01 to 0. It is 0.05 N / mm (0.01 or more and less than 0.05 N / mm). In a specific embodiment, for example, since the width of the first elastic region 71 (length dimension in the vertical direction Y) is 25 mm and the elongation stress is 0.389 N, the elongation stress per unit length (width) is Since it is 0.016 N / mm, the width of the second elastic region 72 (length dimension in the vertical direction Y) is 20 mm, and the elongation stress is 0.893 N, the elongation stress per unit length (width) is 0. Since it is 045 N / mm, the width of the third elastic region 73 (length dimension in the vertical direction Y) is 60 mm, and the elongation stress is 1.378 N, the elongation stress per unit length (width) is 0. It is 022 N / mm.

Referring to FIGS. 2 and 3, the absorbent chassis 12 includes front and rear end portions 12A and 12B attached to the skin facing surfaces of the front and rear waist panels 16 and 17, and an absorbent core 43 extending in the vertical direction Y at least in the crotch region 15. , A liquid-permeable body-side liner (top sheet) 44 formed from a hydrophilic fiber non-woven fabric located on the skin-facing surface side of the absorbent core 43, and a hydrophobic body located on the non-skin-facing surface side of the absorbent core 43. It covers at least the entire surface of the absorbent core 43 facing the backsheet 45, which is arranged between the backsheet 45 formed of the absorbent or impermeable fibrous nonwoven fabric and the absorbent core 43 and the backsheet 45. Includes a liquid-impermeable leak-proof sheet 46 having a size to be used. Various known non-woven fabrics such as SMS non-woven fabric and spunbonded non-woven fabric can be used for the body side liner 44 and the back sheet 45.

The absorbent core 43 is a mixture of a required amount of superabsorbent polymer particles and fluff pulp, and is semi-rigid with higher rigidity than sheet members such as inner and outer layer sheets 21 to 24 constituting the diaper 10. Has. Further, the absorbent core 43 has a panel shape in which the central portion in the vertical direction Y has a narrow width, and the entire absorbent core 43 is covered with a liquid diffusing sheet such as tissue.

The body-side liner 44 and the backsheet 45 extend outward from both ends of the absorbent core 43 in the vertical direction Y, and the extended portions are overlapped with each other and are superposed on each other via a hot melt adhesive (not shown). By joining, a pair of front end flaps 53 and rear end flaps 54 extending outward in the longitudinal direction Y from both ends of the absorbent core 43 are formed. In the front waist region 13, the front end formed by the body side liner (inner surface sheet) 44 and the back sheet (outer surface sheet) 45 between the front end edge 53a of the absorbent chassis 12 and the front end edge 43a of the absorbent core 43. The flap 53 is located. In the rear waist region 14, a body-side liner (inner surface sheet) 44 and a back sheet (outer surface sheet) 45 are formed between the rear end edge 53b of the absorption chassis 12 and the rear end edge 43b of the absorbent core 43. The rear end flap 54 is located.

The back sheet 45 has both side portions 47 located outside in the lateral direction X from both side edges of the leakproof sheet 46. Both side portions 47 are located on both side edges of the leak-proof sheet 46 and are bent toward the skin facing surface along a bending line extending in the vertical direction Y, and are fixed to the body side liner 44 and separated from each other in the vertical direction. Both ends fixing portion 48, proximal edge portion 49 fixed to both side edges of body side liner 44 and both side edges of leak-proof sheet 46, and proximal edge portion extending in the vertical direction between both end fixing portions. It has a distal edge 50 (free edge) extending in the longitudinal direction in parallel with.

The distal edge 50 has a sleeve shape formed by bending and fixing the outer edge of the backsheet 45, and a plurality of string-shaped or strand-shaped cuff elastic bodies 51 extending in the vertical direction are in an extended state. It is fixed to the back sheet 45 in a contractible manner. By contracting the cuff elastic body 51, the distal edge 50 separates from the body side liner 44 toward the wearer's body side to form a leak-proof cuff, which fits on the wearer's thigh and leaks excrement. To prevent. On both sides 47 of the backsheet 45, on the outside of the leakage-proof cuff in the lateral direction X, a plurality of string-shaped or strand-shaped leg elastic bodies 52 extending in the vertical direction Y can be contracted in an extended state. It is fixed to the back seat 45.

The front waist region 13 of the diaper 10 is located between the waist opening edge 19a and the front end edge 53a of the absorption chassis 12, and has a first elastic region 71 elastic by the elastic sheet 30. Therefore, the elastic sheet 30 The entire area of the first elastic region 71 can be pressed against the wearer's skin by the elastic force of the above, and the first elastic region 71 can be prevented from being locally pressed against the wearer's skin. As a result, even if the absorption chassis 12 moves in the vertical direction Y according to the movement of the wearer's legs, the first elastic region 71 located on the waist opening edge 19a side slides on the wearer's skin, and the first elastic region It is possible to prevent the 71 from turning over. Moreover, due to the elastic force of the elastic sheet 30, the entire area of the first elastic region 71 can be pressed against the wearer's skin, and skin troubles caused by locally hitting the wearer's skin with the first elastic region 71. Can be prevented from occurring. In addition, since the second elastic region 72, which has a larger elongation stress than the first elastic region 71, is located between the front end edge 53a of the absorption chassis 12 and the front end edge 43a of the absorbent core 43, the absorption chassis 12 is vertically aligned. It is possible to suppress the movement in the direction and prevent the position of the diaper 10 from shifting.

In addition, since the second elastic region 72 and the third elastic region 73 are defined by the thread-shaped or ribbon-shaped front waist elastic body (second waist elastic body) 27 extending in the lateral direction X, the front waist elastic body is formed. It is possible to locally increase the elastic force at the place where 27 is present and prevent the absorption chassis 12 from shifting.

Further, as shown in FIG. 4, the waist opening edge 19a of the front waist region 13 forms a non-fixed region 65 in which the adhesive (fixing portion) 64a does not exist, so that the waist opening edge of the front waist region 13 is formed. It is possible to suppress the increase in rigidity of 19a and improve the wearing comfort.

Further, in the front waist region 13, the front upper waist elastic body 27a closest to the waist opening edge 19a in the vertical direction Y among the plurality of front upper waist elastic bodies 27A and the front end edge 53a of the absorption chassis 12 are separated from each other. Therefore, it is possible to prevent the formation of a locally highly rigid portion and improve the wearing comfort.

Further, in the front waist region 13, the front lower waist elastic body 27b closest to the waist opening edge 19a in the vertical direction Y among the plurality of front lower waist elastic bodies 27B includes the elastic sheet 30 and the intermediate sheets 38 and 39. Since the front and lower waist elastic bodies 27b are arranged in a region where they are separated from each other, the front lower waist elastic body 27b can be arranged and the absorption chassis 12 can be suppressed from moving in the vertical direction Y.

Further, the fineness, elongation ratio, and elasticity of the rear upper waist elastic body 28A are increased so that the extension stress on the waist opening edge 19a side in the rear waist region 14 is larger than the extension stress on the waist opening edge 19a side in the front waist region 13. By setting the separation dimension (pitch) between the bodies, the rear waist region 14 can be brought into contact with the back side, and the diaper 10 can be prevented from being displaced.

FIG. 7 is a diagram similar to FIG. 3 showing the front waist region 13 of the first modification of the diaper 10 according to the present invention, and FIG. 8 is a cross-sectional view taken along the line VIII-VIII shown in FIG. The front waist region 13 has a first portion 81 extending in the vertical direction Y, and a second portion 82 having a lower rigidity than the first portion 81 and deviating from the first portion 81. The front waist region 13 of the diaper 10 has a linear first portion 81 (first portion 81 continuously extending in the vertical direction Y) and a linear second portion 82 (continuously extending in the vertical direction Y). The two portions 82) are alternately arranged in the lateral direction X. The length dimension of the first portion 81 in the vertical direction Y is preferably, for example, 10 to 50 mm, and the lateral direction of one arbitrarily selected first portion 81 and the other first portion 81 adjacent to the first portion 81. The distance between the directions X is, for example, 5 to 40 mm.

The first portion 81 is a portion in which the inner layer sheet, the outer layer sheet, and the elastic sheet 30 are fixed. In the first portion 81, the inner layer sheet 21, the outer layer sheet 23, and the elastic sheet 30 are fixed by, for example, heat embossing, various heat welding means by sonic or the like, various adhesive means by hot melt adhesive or the like. .. The second portion 82 is a portion in which the inner layer sheet 21, the outer layer sheet 23, and the elastic sheet 30 are not fixed. In the vertical direction Y, the first portion 81 is arranged only on the waist opening edge 19a side so as not to overlap with the absorbent core 43, and is not arranged on the crotch region 15 side.

According to this diaper 10, since the first portion 81 having a higher rigidity than the second portion 82 extends in the vertical direction, the first portion 81 becomes a resistance when the waist opening edge 19a side bends, and the waist opening edge 19a side is turned over. It is possible to prevent a large number of wrinkles from occurring on the waist opening edge 19a side.

In addition, since the elastic sheet 30 contracts laterally X and the second portion 82 swells away from the wearer's skin, the contact area between the skin-facing surface of the front waist region 13 and the wearer's skin. Can be made smaller, and the waist opening edge 19a side can be prevented from turning over.

Further, in the vertical direction Y, the first portion 81 is arranged only on the waist opening edge 19a side so as not to overlap with the absorbent core 43, so that the portion where the rigidity is different in the front waist region 13 is reduced. The front waist region 13 can be brought into contact with the wearer's skin along the abdomen swelled by eating and drinking.

FIG. 9 is a diagram similar to FIG. 3 showing the front waist region 13 of the second modification of the diaper 10 according to the present invention. In the front waist region, the point-shaped first portion 83 is linearly arranged along the vertical direction Y.

According to the diaper 10, since the dotted first portions 83 are arranged at intervals in the vertical direction Y, one arbitrarily selected first portion 83 and the first portion 83 in the vertical direction Y. In the second portion 82 located between the other first portion 83 adjacent to the diaper, the elasticity of the elastic sheet 30 is continuous in the lateral direction X, and it is possible to suppress the deterioration of the fit of the diaper 10. ..

FIG. 10 is a diagram similar to FIG. 3 showing the front waist region 13 of the third modification of the diaper 10 according to the present invention. The front waist region 13 has a central region 84 located in the center of the lateral direction X and both side regions 85 located on both sides of the lateral direction X of the central region 84. In the lateral direction X, the first portion 81 and the second portion 82 are arranged so that the distance between the first portion 81 of the side region 85 is larger than the distance between the first portion 81 of the central region 84. The dimension of the central region 84 in the lateral direction X is, for example, the same as the dimension of the absorbent core 43 in the lateral direction X, and the central region 84 and the absorbent core 43 are positioned so as to overlap each other in the lateral direction X. .. The bilateral region 85 is located so as to deviate from, for example, the absorbent core 43 in the lateral direction X.

According to this diaper 10, since the rigidity of the central region 84 is larger than the rigidity of the both side regions 85, the force that the central region 84 on the waist opening edge 19a side tends to turn is suppressed, and the central region 84 is prevented from turning. be able to. Moreover, since the rigidity of the central region 84 is larger than the rigidity of the both side regions 85, the force of turning over the waist opening edge 19a is suppressed from being transmitted in the lateral direction X, and the central region on the waist opening edge 19a side is prevented from turning over. can do.

FIG. 11 is a diagram similar to FIG. 3 showing the front waist region 13 of the fourth modification of the diaper 10 according to the present invention. The elastic sheet 30 has a seat center area 86 located in the center of the lateral direction X of the front waist area 13 and a seat center area 87 located on both sides of the front waist area 13 in the lateral direction X. The stress reducing portion 88 is provided in the center region 86 of the seat so that the elongation stress of the 86 is smaller than the elongation stress of the regions 87 on both sides of the seat. The stress reducing portion 88 can be formed by, for example, a slit and a hole located in the central region 86 of the seat. Further, the stress reducing portion 88 can be formed in the sheet central region 86 of the elastic sheet 30 by various heat welding means such as heat embossing and sonic.

According to this diaper 10, since the rigidity of the seat central region 86 is smaller than the rigidity of the seat bilateral region 87, it is possible to suppress the abdomen from being compressed when the abdomen is inflated when the abdomen is full. You can improve your comfort.

FIG. 12 is a diagram similar to FIG. 4, showing the front waist region 13 of the fifth modification of the diaper in the present invention. The front waist elastic body 27 in the front waist region 13 includes a front upper waist elastic body (first elastic body) 27x adjacent to the waist opening edge 19a side of the front end edge 43a of the absorbent core 43 and a crotch region 15 of the front end edge 43a. It has a front lower waist elastic body (second elastic body) 27y adjacent to the side and a front lower waist elastic body (third elastic body) 27z adjacent to the crotch region 15 side of the second elastic body 27y. The first elastic body 27x and the second elastic body 27y are located in the vertical direction Y with the front end edge 43a of the absorbent core 43 interposed therebetween.

For example, as for the contraction force of each elastic body, the contraction force of the first elastic body 27x is 0.120 to 0.150N, the contraction force of the second elastic body 27y is 0.160 to 0.200N, and the third elastic body. The contraction force of the elastic body 27z is 0.210 to 0.260N. In a specific embodiment, for example, the contraction force of the first elastic body 27x is 0.133N, the contraction force of the second elastic body 27y is 0.178N, and the contraction force of the third elastic body 27z is 0. It is 234N.

According to this diaper 10, the contraction force of the first elastic body 27x and the second elastic body 27y adjacent to the crotch region 15 side and the waist opening edge 19a side of the front end edge 43a of the absorbent core 43 is relatively small. The vicinity of the front edge 43a of the absorbent core 43 is pressed against the wearer's body with an appropriate force, and the portion between the front edge 43a of the absorbent core 43 and the front edge 53a of the absorbent chassis 12 separates from the body. It is possible to prevent the ridge from rising, and it is possible to prevent the displacement of the front waist region 13. In addition, since the contraction force of the third elastic body 27z adjacent to the second elastic body 27y is larger than the contraction force of the first elastic body 27x and the second elastic body 27y, the vicinity of the front end edge 43a of the absorbent core 43. Can be pressed against the body to prevent the vicinity of the front edge 43a of the absorbent core 43 from leaving the body.

<Measurement method of contraction force of each elastic body>
The contraction force of the front and rear waist elastic bodies 27 and 28 including the first elastic body 27x, the second elastic body 27y, and the third elastic body 27z has a predetermined width in the front and rear waist panels 16 and 17 (predetermined in the vertical direction Y). The region including each elastic body 27, 28 can be obtained as follows by cutting out a strip-shaped region (having a length dimension of). Specifically, for example, when measuring the contraction force of the second elastic body 27y, first, the absorption chassis 12 is removed from the elastic waist panel 11, and then the side seams 18 are peeled off to peel off the front waist panel 16 and the rear waist panel. Separate from 17. Next, in the vertical direction Y of the front waist panel 16, the first cutting line crossing the portion that bisects between the first elastic body 27x and the second elastic body 27y, and the second elastic body 27y and the third. A strip piece of predetermined width extending between both side edges 16c, 16d, 17c, 17d, including the second elastic body 27y, along the second cutting line that crosses the portion that bisects the elastic body 27z. It was cut out to make a test piece. Before cutting out the test piece, the dimension of the test piece in the lateral direction X is measured in a state where the diaper 10 is unfolded and stretched to the extent that gathers due to the contraction action of the elastic bodies 27 and 28 are eliminated on the surface of the diaper 10. And made the initial dimensions.

Next, using an autograph type tensile tester (for example, AG-1KN1) manufactured by Shimadzu Corporation, one end of each test piece is sandwiched between fixed chucks and the other end is sandwiched between movable chucks at 300 mm / min. The tensile load (N) when contracted to a size of 75% of the initial dimension at a speed was obtained and used as the contraction force of each elastic body.

The contraction force of each of the elastic bodies 27 and 28 can be appropriately adjusted depending on the fineness and the elongation ratio. The thickness of the first elastic body 27x and the second elastic body 27y is, for example, 350 to 550 dtex, and the thickness of the third elastic body 27z is 500 to 700 dtex. Further, the first elastic body 27x is attached to at least one of the inner and outer layer sheets 21 and 23 in a state of being stretched 2.1 to 2.4 times, and the second elastic body 27y and the third elastic body 27z are 2. Since it is attached to the inner and outer layer sheets 21 and 23 in a state of being stretched 4 to 2.6 times, the elongation ratio of the first elastic body 27x is the extension ratio of the second elastic body 27y and the elongation ratio of the third elastic body. It is smaller than the magnification. Since the absorbent core 43 is semi-rigid, it is relatively rigid. However, the second elastic body 27y and the third elastic body 27z overlap with the absorbent core 43 in a plan view, while the first one. The elastic body 27x does not overlap the absorbent core 43 in plan view. Therefore, the first elastic body 27x is more likely to be stretched in the lateral direction X than the second elastic body 27y and the third elastic body 27z, and when the elongation ratio of the first elastic body 27x is large, the abdomen protruding forward causes the first elastic body 27x. The second elastic body 27y and the third elastic body 27z that extend toward the waist and strongly press the portion where the first elastic body 27x is present against the body, while the second elastic body 27y and the third elastic body 27z overlap with the arranged portion of the highly rigid absorbent core 43. Since it is difficult to stretch, the portion between the first elastic body 27x and the second elastic body 27y may be separated from the body to form a gap. However, in the present embodiment, since the extension ratio of the first elastic body 27x is smaller than the extension ratio of the second elastic body 27y and the extension ratio of the third elastic body 27z, the first elastic body 27x and the second elastic body By extending the 27y and the third elastic body 27z in a well-balanced manner, it is possible to prevent the above-mentioned disadvantages from occurring.

In the above-described embodiment, the diaper 10 in which the second elastic region 72 and the third elastic region 73 are defined by the thread-shaped or ribbon-shaped front waist elastic body 27 and the rear waist elastic body 28 has been described. However, the present invention is not limited to this, and the second elastic region 72 and the third elastic region 73 may be defined by another elastic sheet 30 different from the elastic sheet 30 described above.

Further, in the above-described embodiment, the first portions 81 and 83 in which the inner layer sheet 21, the outer layer sheet 23 and the elastic sheet 30 are fixed have been described. However, the present invention is not limited to this, and in the first portions 81 and 83, either one of the inner layer sheet 21 and the outer layer sheet 23 and the elastic sheet 30 may be fixed.

Further, in the above-described embodiment, the diaper 10 in which the outer layer sheets 23 and 24 have the main body portions 23a and 24a and the extension portions 23b and 24b has been described. However, the present invention is not limited to this, and the outer layer sheets 23 and 24 may not have the extending portions 23b and 24b.

Further, in the above-described embodiment, the diaper 10 in which the elastic sheet 30 is located between the inner layer sheet 21 and the outer layer sheet 23 has been described. However, the present invention is not limited to this, and the elastic sheet 30 may be located on the skin facing surface side of the inner layer sheet 21 or may be located on the non-skin facing surface side of the outer layer sheet 23.

Further, by applying a friction reducing means such as silicon lotion to the extending portion 23b and / or the inner layer sheet 21 of the outer layer sheet 23 located on the skin facing surface side of the front waist area 13, the waist opening edge of the front waist area 13 is further applied. The 19a side may be made to slide on the wearer's skin, and the waist opening edge 19a side of the front waist region 13 may be prevented from being turned over.

Further, in the above-described embodiment, the diaper 10 having different specifications such as contraction force, elongation ratio, and thickness depending on the position where the plurality of front and rear waist elastic bodies 27 and 28 are arranged has been described. However, the present invention is not limited to this, and the specifications of the plurality of front and rear waist elastic bodies 27 and 28 may be the same.

The configuration of the diaper 10 of the above-described embodiment and the configuration of the diaper 10 of the first modification to the fifth modification can be appropriately combined.

Unless otherwise specified, known materials commonly used in this field can be used without limitation in addition to the materials described in the present specification for the members constituting the diaper 10. .. In addition, terms such as "first" and "second" used in the present specification are used only for distinguishing similar elements, positions, and the like.

10 Disposable diapers (disposable items)
12 Absorption chassis (liquid absorption structure)
13 Front waist area 14 Rear waist area 15 Crotch area 19 Waist opening 19a Waist opening edge 21 Inner layer sheet (sheet formed of fibrous non-woven fabric)
23 Outer layer sheet (sheet made of fibrous non-woven fabric)
27A Front upper waist elastic body (second waist elastic body)
27x 1st waist elastic body 27y 2nd waist elastic body 27z 3rd waist elastic body 30 Elastic sheet (1st waist elastic body)
43 Absorbent core 43a Front edge 44 Body side liner (inner sheet)
45 Back seat (outer seat)
53 Front end flap (front flap)
53a Front edge 71 1st elastic region 72 2nd elastic region 81 1st part 82 2nd part 83 1st part 84 Central area 85 Both sides area 86 Seat central area 87 Sheet both sides area 88 Stress reduction part X Horizontal direction Y Vertical direction

Claims (10)

A liquid-absorbing structure having a lateral and vertical direction, a crotch region located between the front waist region, the rear waist region, the anterior-posterior waist region, and an absorbent core extending from the crotch region to the front waist region. In disposable wear items, including the body and waist openings
The anterior waist region includes at least two sheets made of fibrous non-woven fabric, a first waist elastic body located at least at the waist opening edge, a front end edge of the liquid absorbing structure, and a front end of the absorbent core. The second waist elastic body located between the first elastic body, the first elastic region having elasticity by the elastic sheet which is the first waist elastic body, and the elastic first waist elastic body and the second waist elastic body have elasticity. It also has a second elastic region and
The first elastic region is located between the waist opening edge and the front end edge of the liquid absorbing structure.
The second elastic region is located on the crotch region side of the first elastic region.
The lateral elongation stress of the second elastic region is larger than the lateral elongation stress of the first elastic region.
The posterior waist region extends from the waist opening edge to the posterior edge of the absorbent core, formed from an inner / outer layer sheet and a thread-like or ribbon-shaped posterior waist elastic body arranged between the inner / outer layer sheets. Has an elastic range,
A worn article characterized in that the rear waist elastic body located on the most waist opening edge side of the rear waist elastic body is located adjacent to a bent portion of the outer layer sheet forming the waist opening edge. The worn article according to claim 1, wherein the second elastic region is defined by the second elastic body having a plurality of threads or ribbons extending in the lateral direction. The worn article according to claim 1 or 2, wherein the front waist region has a first portion extending in the vertical direction and a second portion having a rigidity smaller than that of the first portion and deviating from the first portion. The first portion is a portion in which at least one of the two sheets and the elastic sheet are fixed.
The second portion is a portion in which the two sheets and the elastic sheet are not fixed.
The worn article according to claim 3, wherein the first portion is arranged at intervals in the lateral direction, and the second portion is located between the two first portions. The worn article according to claim 3 or 4, wherein the first portion is arranged at intervals in the vertical direction. The anterior waist region has a central region located in the center of the lateral direction and a bilateral region located on both sides of the central region in the lateral direction.
The worn article according to claim 4, wherein the distance between the first portions of the two-sided region in the lateral direction is larger than the distance between the first portions of the central region. The elastic sheet has a seat center region located in the lateral center of the front waist region and a seat both side region located on both sides of the front waist region in the lateral direction, and has a seat center region. The worn article according to any one of claims 1 to 5, which has a stress reducing portion in the central region of the seat so that the elongation stress is smaller than the elongation stress in both sides of the seat. The elastic sheet and the sheet are fixed to each other by the fixing portion extending in the vertical direction.
The worn article according to claim 4, wherein a non-existent area in which the fixed portion does not exist is formed on the waist opening edge of the anterior waist area. The liquid absorbing structure has an inner surface sheet located on the skin facing surface side and an outer surface sheet located on the non-skin facing surface side.
A front flap formed by the inner surface sheet and the outer surface sheet is located between the front end edge of the liquid absorbing structure and the front end edge of the absorbent core.
A claim in which the second waist elastic body having a plurality of articles closest to the waist opening edge in the vertical direction and the front end edge of the liquid absorbing structure are separated from each other. The worn goods described in 2. The anterior waist region includes a first elastic body adjacent to the waist opening edge side of the anterior end edge of the absorbent core, a second elastic body adjacent to the crotch region side of the anterior end edge, and a second elastic body. Has a third elastic body adjacent to the crotch region side of the
The worn article according to any one of claims 1 to 9, wherein the contraction force of the first elastic body and the contraction force of the second elastic body are smaller than the contraction force of the third elastic body.

Images