JP4980480B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as sanitary napkins, panty liners, and disposable diapers.

Conventionally, as an absorbent article such as a sanitary napkin, it has a liquid-permeable surface layer, a liquid-impermeable back layer, and a liquid-retaining absorbent layer disposed between the surface layer and the back layer. A vertically long absorbent article having a pair of wings on both sides in the longitudinal direction is known. Such an absorbent article is normally used by folding back a pair of wings when worn and fastened to the outer surface of a crotch portion such as shorts.
Moreover, in order to improve the leak-proof property in the both sides of an absorbent article, it is also known to form a three-dimensional gather standing on the skin side of the wearer on both sides of the absorbent article.
As an absorbent article including a pair of wings and a pair of three-dimensional gathers, Patent Document 1 discloses that a pair of wings is an outer surface of a standing surface of the three-dimensional gathers and extends from the base end portion to the front end portion of the three-dimensional gathers. An absorbent article provided with a gap as a base point is presented.

Japanese Patent Laid-Open No. 2003-210525

The absorbent article described in Patent Document 1 prevents the three-dimensional gather connected to the wing from falling inward by a force pulled outward in the width direction when the pair of wings are folded back.
However, in the absorbent article described in Patent Document 1, depending on the strength of pulling the wing when folding the wing, the three-dimensional gather may fall to the outside, and the three-dimensional gather may fall to the outside. An article may be put on, which causes a side leak.

  Therefore, an object of the present invention is to provide an absorbent article having good gather standing stability and excellent side leakage prevention effect.

In the present invention, the front surface layer, the back surface layer, the absorbent layer disposed between them, and the front surface layer are formed to be spaced apart from each other in the longitudinal direction and have a hollow portion by the sheet-like member. A vertically long absorbent article comprising a pair of gathers and a pair of wings formed by extending the surface layer and / or the back layer outward in the width direction of the absorbent layer, Each of the pair of gathers is bonded to the front surface layer and / or the back surface layer by a bonding portion formed so as to extend in the longitudinal direction of the absorbent article in a state where the sheet-like member has a three-dimensional shape portion. The three-dimensional shape portion is formed so as to constitute the hollow portion, and the joint portion includes a first joint end portion that forms an end portion on the inner side in the width direction of the three-dimensional shape portion, and the three-dimensional shape portion. Width outward edge at The first joint end is located on a region of the surface layer where the absorber is disposed, and the second joint end includes at least the pair of wings. In the region where is disposed, by providing an absorbent article that is located on the outer region in the width direction with respect to the outer edge of the absorber in the front surface layer and / or the back surface layer, the object is achieved. Achieved.
More specifically, the present invention provides the following.

  (1) It has a surface layer at least partially having a liquid-permeable surface sheet, a back surface layer having a liquid-impermeable back sheet, and a liquid-retaining vertically long absorber disposed between the two. The absorbent layer, a pair of gathers formed to be spaced apart from each other on both sides in the longitudinal direction of the surface layer, and configured to have a hollow portion by a sheet-like member, and the surface layer and / or the back surface layer A vertically long absorbent article comprising a pair of wings formed extending outward in the width direction of the absorbent layer, wherein each of the pair of gathers includes the sheet-like member, the skin contact of the absorbent article It has a three-dimensional shape portion that is convex on the contact surface side, and the three-dimensional shape portion is bonded to the front surface layer and / or the back surface layer by a bonding portion formed so as to extend in the longitudinal direction of the absorbent article. And the hollow portion is formed. The joining portion forms a first joining end portion that forms an end portion on the inner side in the width direction of the three-dimensional structure portion, and an end portion on the outer side in the width direction of the three-dimensional structure portion. The first joint end is located on a region of the surface layer where the absorber is disposed, and the second joint end includes at least the pair of wings. In the area | region currently performed, the absorbent article located in the area of the said width direction outer side rather than the outer edge of the said absorber in the said surface layer and / or the said back surface layer.

  (2) The distance between the joining ends in the vicinity of both ends in the longitudinal direction of the absorbent article is greater than the distance between the joining ends in the longitudinal center of the absorbent article, and the pair of wings The absorbent article as described in (1) distribute | arranged to the direction center part.

  (3) The absorbent article according to (1) or (2), wherein at least the surface layer side surface of the pair of wings is formed by the sheet-like member.

  (4) Each of the pair of gathers has a plurality of elastic members, and the plurality of elastic members are arranged on the surface or inside of the sheet-like member and arranged along the longitudinal direction ( The absorbent article in any one of 1)-(3).

  ADVANTAGE OF THE INVENTION According to this invention, the standing stability of gathers is favorable and the absorbent article excellent in the side leakage prevention effect can be provided.

FIG. 1 is a perspective view of a sanitary napkin as an embodiment of the absorbent article of the present invention in a natural state. FIG. 2 is a plan view of the sanitary napkin shown in FIG. 1 as seen from the surface sheet side in a natural state. 3 is a cross-sectional view taken along line XX in FIG. FIG. 4 is a partially enlarged view of FIG. 5 is a cross-sectional view taken along line YY in FIG. FIG. 6 is a view showing the arrangement of the first joint, the second joint, and the third joint in the absorbent article shown in FIG.

  FIG. 1 is a perspective view of a sanitary napkin as an embodiment of the absorbent article of the present invention in a natural state. FIG. 2 is a plan view of the sanitary napkin shown in FIG. 1 as seen from the surface sheet side in a natural state. 3 is a cross-sectional view taken along line XX in FIG. FIG. 4 is a partially enlarged view of FIG. 5 is a cross-sectional view taken along line YY in FIG. FIG. 6 is a view showing the arrangement of the first joint, the second joint, and the third joint in the absorbent article shown in FIG.

Hereinafter, a preferred embodiment of the absorbent article of the present invention will be described with reference to the drawings.
The sanitary napkin 1 of the present embodiment has a vertically long shape as shown in FIGS. 1 to 3, and has a liquid-permeable surface sheet 2 as a surface layer and a liquid-impermeable as a back layer. A back sheet 3 and an absorbent body 4 as a liquid-retaining absorbent layer interposed between the both are provided. A pair of gathers 5 and 5 that are formed so as to be separated from each other and have a hollow portion by the sheet-like member 9 are arranged on both sides in the longitudinal direction on the surface sheet 2 side of the sanitary napkin 1. The pair of gathers 5 and 5 stands on the skin contact surface side in the vicinity of the side edge of the absorbent body 4. A pair of wings 6 and 6 extending outward in the width direction are formed on both side portions of the sanitary napkin 1 in the longitudinal direction.

A surface layer is a layer which comprises the surface of the side contact | abutted to a wearer's skin at the time of wear of an absorbent article, and a surface layer consists of the surface sheet 2 and the sheet-like member 9 in this embodiment. The surface layer also includes a second sheet (not shown) disposed between the surface sheet and the absorber.
A back surface layer is a layer which comprises the surface by the side of the non-skin contact surface of an absorbent article, and the back surface layer consists of the back surface sheet 3 in this embodiment.
The absorbent layer includes the absorbent body 4 and a core wrap material (not shown) that covers the absorbent body 4.

  As shown in FIG. 2, the sanitary napkin 1 has a central portion A that is a portion facing the excretory portion of the wearer when worn, and a front portion that is disposed closer to the wearer's ventral side than the central portion A when worn. B and a rear portion C disposed on the back side of the central portion A when worn.

  As shown in FIGS. 2 and 3, the top sheet 2 covers the entire upper surface of the absorber 4. The back sheet 3 covers the entire lower surface of the absorber 4. The back sheet 3 extends outward in the width direction from the side edge of the absorber 4 at the position of the central portion A to form part of a pair of wings 6 and 6. Further, the back sheet 3 also extends outward in the width direction from the side edge of the absorber 4 at the rear portion C to form part of the pair of rear flaps 7, 7. In the central part A and the rear part C, sheet-like members 9 forming a pair of gathers 5 and 5 to be described later extend outward in the width direction, respectively, and a pair of wings 6 and 6 and a pair of rear flaps 7 and 7. Form a part of That is, the pair of wings 6, 6 and the pair of rear flaps 7, 7 are composed of the sheet-like member 9 and the back sheet 3, and are formed by joining them together. The top sheet 2 and the back sheet 3 respectively extend from the front and rear ends of the absorbent body 4 and are joined to each other at the extended portions.

As shown in FIGS. 3 and 4, wing adhesive portions 14 and 14 are provided on the lower surface side of the back sheet 3 in the pair of wings 6 and 6, respectively. Moreover, the main body adhesive part 15 is provided in the lower surface side of the back surface sheet 3 in the main-body part (area | region where the absorber 4 is arrange | positioned) of the sanitary napkin 1. FIG. The main body adhesive portions 15 are provided in two rows so as to extend in the longitudinal direction of the sanitary napkin 1.
The wing adhesive part 14 and the main body adhesive part 15 are formed by applying a hot melt adhesive material on the lower surface side of the back sheet 3.

  As shown in FIG. 3, a leak-proof groove 8 formed by integrally compacting the absorbent body 4 and the top sheet is provided on the top sheet side of the absorbent body 4. As shown in FIG. 2, the pair of gathers 5 and 5 described above are located outward in the width direction of the leak-proof groove 8. The leak-proof groove 8 is substantially symmetric with respect to the longitudinal center line (not shown) of the sanitary napkin 1. In the present embodiment, the leak-proof groove 8 includes a first leak-proof groove 8 a provided from the front part B to the rear part C and a second leak-proof groove 8 b provided in the rear part C. The first leakage prevention groove 8a has a vertically long annular shape. Further, as shown in FIG. 2, the first leakage prevention groove 8 a has a shape curved in a convex shape outward in the width direction at the center portion A. The second leak-proof groove 8b is provided outside the first leak-proof groove 8a and has a shape curved convexly toward the rear. The front ends of the second leak-proof grooves 8b are located in the vicinity of the first leak-proof grooves 8a, respectively, but are not connected to the first leak-proof grooves 8a.

  A pair of gathers 5 and 5 arranged on both sides of the sanitary napkin 1 is formed of a sheet-like member 9 as shown in FIGS. The pair of gathers 5, 5 has a three-dimensional shape portion 10 in which the sheet-like member 9 is convex on the outer surface side in the thickness direction, which is the skin contact surface side of the sanitary napkin 1, and the sanitary napkin 1 It is joined to the front surface layer and / or the back surface layer by the joint portion 11 formed so as to extend in the longitudinal direction. And this solid-shaped part 10 is comprised so that it may have a hollow part in the inside, and the gathers 5 which has a solid shape are formed.

As shown in FIG. 4, the joint portion 11 forms a first joint end portion 10 a that forms an end portion on the inner side in the width direction of the three-dimensional shape portion 10 and an end portion on the outer side in the width direction of the three-dimensional shape portion. And a second joint end portion 10b. And the 1st joined end part 10a is located on the field where absorber 4 is arranged in the surface layer, and the 2nd joined end part 10b is in the field where at least a pair of wings 6 and 6 are arranged. It is located on the area | region of the width direction outer side from the outer edge of the absorber 4 in an absorption layer and / or a back surface layer.
In the present embodiment, the second joint end portion 10 b is a region on the back sheet 3 that is located outward in the width direction from the side edge in the longitudinal direction of the absorbent body 4 over substantially the entire longitudinal direction of the sanitary napkin 1. Located in. The second joint end 10b is located in the region on the back sheet 3 as well as the case where the second joint end 10b is formed by joining the sheet-like member 9 and the back sheet 3. The case where the end portion 10 b is formed by joining the sheet-like member 9 disposed on the upper surface of the back sheet 3 or the other sheet and the sheet-like member 9 is also included.

  The region where the absorber 4 is arranged in the surface layer where the first joint end 10a is located is a region having high rigidity due to the presence of the thick absorber 4. On the other hand, since the absorber 4 is not disposed in the region where the second joint end 10b is located, the region has a lower rigidity than the region where the first joint end 10a is located.

Further, as shown in FIGS. 3 and 4, the joint portion 11 includes a first joint portion 11 a formed inward in the width direction of the sanitary napkin 1, and an outer side in the width direction than the first joint portion. The second joint portion 11b is formed. The first joint end 10a is formed at the first joint 11a, and the second joint end 10b is formed at the second joint 11b.
The 1st junction part 11a is formed by joining the sheet-like member 9 and the surface sheet 2 by hot embossing. The second joining portion is formed by joining the folded sheet-like members 9 with a hot melt adhesive.

In the present embodiment, the length L1 from the first joint end 10a to the second joint end 10b in the three-dimensionally shaped portion 10 and the distance between the first joint end 10a and the second joint end 10b. The ratio (L1 / L2) to a certain junction end distance L2 is preferably 2 or more, more preferably 2 to 15, and most preferably 5 to 11.
As shown in FIG. 4, the gather 5 has a substantially Ω shape in which the cross-sectional shape in the width direction is larger in the maximum width L3 in the three-dimensional shape of the gather 5 than the distance L2 between the joining ends. .
In the present specification, the substantially Ω shape includes a shape in which the maximum width of the gather is wider than the width at the lower end in the cross-section in the width direction of the gather having a hollow three-dimensional shape, for example, the cross-section of the gather It also includes an Ω-like shape that is inclined so that the shape falls inward or outward in the width direction.

  The distance L1 between the first joint end 10a and the second joint end 10b in the three-dimensional shape portion 10 is the distance between the first joint end 10a and the second joint end 10b. If the number is less than 2 with respect to L2, there is a possibility that the gather 5 cannot form a three-dimensional shape having a sufficient hollow portion and a good side leakage prevention effect cannot be obtained.

  The distance L2b between the joining ends on both ends in the longitudinal direction of the sanitary napkin 1 is larger than the distance L2a between the joining ends in the longitudinal center A of the sanitary napkin 1 (see FIG. 6). Specifically, from the viewpoint of improving the standing stability of the gather 5, the distance L2b between the joint ends on both ends in the longitudinal direction of the sanitary napkin 1 is the distance between the joint ends in the longitudinal center A of the sanitary napkin 1. It is preferably 1 to 26 mm larger than the distance L2a.

  As shown in FIG. 5, at both ends in the longitudinal direction of each of the pair of gathers 5, 5, a third joint portion 12 that joins the sheet-like member 9 to the front surface layer or the back layer outside the joint portion 11. Is formed. And the distance L4 between the outer side edge part 12a in the 3rd junction part 12 and the 1st junction end part 10a is made longer than the distance L2a between junction ends in the longitudinal direction center part A of the sanitary napkin 1. (See FIG. 6). In the present embodiment, as shown in FIG. 5, the third joint portion 12 is formed by joining the sheet-like members 9 with a hot melt adhesive on the outer side in the width direction than the second joint portion 11 b. .

  In the present embodiment, the pair of gathers 5 and 5 are joined to the surface layer by the third joining portion 12 at the front end portion and the rear end portion in the longitudinal direction. The gathers 5 and 5 do not stand up and do not have a three-dimensional shape. That is, the pair of gathers 5 and 5 are planar at both ends of the sanitary napkin 1 in the longitudinal direction. And in the area | region between the front-end part and rear-end part of the longitudinal direction of the sanitary napkin 1 in which the 3rd junction part 12 is not provided, a pair of gathers 5 and 5 stand up to the skin contact surface side. A hollow three-dimensional shape is formed.

The range in which the third joint portion 12 is formed substantially coincides with the region having the joint end portion distance L2b on both ends in the longitudinal direction of the sanitary napkin 1.
The range having the distance L2b between the joint ends on the both ends in the longitudinal direction of the sanitary napkin 1, that is, the range in which the third joint is formed is 40 to 70 mm from the front end in the front part B of the sanitary napkin 1. It is preferable that it is the range of these. Moreover, in the rear part C, it is preferable that it is the range of 70-120 mm from a rear end.

If the range where the third joint 12 is formed is less than 40 mm from the front end in the front part B of the sanitary napkin 1 and less than 70 mm from the rear end in the rear part C, the gather 5 having a three-dimensional shape There is a possibility that the length of the standing portion of the garment will become long and the gathers 5 will fall easily. Moreover, in the rear part C, there exists a possibility that the gather 5 which has a three-dimensional shape may give discomfort in a wearer's buttocks.
When the range where the third joint portion 12 is formed exceeds 70 mm from the front end in the front portion B of the sanitary napkin 1 and exceeds 120 mm from the rear end in the rear portion C, the gather 5 having a three-dimensional shape There is a possibility that the length of the standing portion in the case will be shortened, the standing property of the gather 5 will be lowered, and the fitting property at the time of wearing may be lowered.

  Moreover, as shown in FIG. 6, the center S1 in the width direction of the joint part 11 in the longitudinal center part A of the sanitary napkin 1 is between the outer end part 12a and the first joint end part 10a in the third joint part 12. It is located inward in the width direction from the center S2. Specifically, the center S1 in the width direction of the joint portion 11 is about 0.5 to 13 mm in the width direction from the center S2 between the outer end portion 12a and the first joint end portion 10a in the third joint portion 12. It is preferable that it is located in the direction.

  A plurality of elastic members 13 are arranged in the pair of gathers 5 and 5, respectively. The plurality of elastic members 13 are arranged on the surface or inside of the sheet-like member 9 with a predetermined interval along the longitudinal direction of the sanitary napkin 1. The plurality of elastic members 13 are joined to the sheet-like member 9 in a stretched state using a hot melt adhesive. When joining the plurality of elastic members 13 to the sheet-like member 9, the hot melt adhesive is applied to the plurality of elastic members 13 from the viewpoint of reducing the application area of the hot melt adhesive and improving the touch. It is preferable to join the sheet-like member 9.

  In the present embodiment, as shown in FIGS. 3 to 5, six elastic members 13 are arranged in each of the pair of gathers 5 and 5, and each of the plurality of elastic members 13 is a sheet. The member 9 is disposed along the longitudinal direction at substantially equal intervals in the width direction. And the some elastic member is distribute | arranged to all of the inner side part 5a in the three-dimensional shape of a pair of gathers 5 and 5, the top part 5b, and the outer side part 5c, as shown in FIG.

  Of the plurality of elastic members 13 arranged on the outer side portion 5c, the first elastic member 13a disposed at a position closest to the second joining end portion 10b is a second elastic member adjacent to the first elastic member 13a. It is located inward in the width direction of the sanitary napkin 1 than 13b. Moreover, the 3rd elastic member 13c adjacent to the 2nd elastic member 13b is located in the width direction inner side of the sanitary napkin 1 rather than the 2nd elastic member 13b. That is, the second elastic member 13b is located at the outermost side in the width direction, and the first elastic member 13a and the third elastic member 13c adjacent to the second elastic member 13b are located inside thereof. .

By arranging the plurality of elastic members 13 in this manner on the outer side portion 5c, the sanitary napkin 1 of the present embodiment can stably maintain the substantially Ω shape of the gathers 5.
Further, the gathers 5 of the present embodiment are configured such that both the first elastic member 13a and the third elastic member 13c adjacent to both sides of the second elastic member 13b are located inward in the width direction of the second elastic member 13b. Resistance to force from the width direction increases. Therefore, even when the sanitary napkin 1 receives a force in the width direction, the gather 5 having a three-dimensional shape is unlikely to fall down.

  In the natural state, the sanitary napkin 1 of the present embodiment is bent in a concave shape toward the skin contact surface side in the longitudinal direction due to the contraction force of the plurality of elastic members 13 disposed on the sheet-like member 9 in the stretched state. Has a shape. The natural state refers to a state where no external force other than gravity is applied to the sanitary napkin 1.

In addition, from the viewpoint of stably maintaining the three-dimensional shape of the gather 5, the plurality of elastic members 13 are at least part of the inner side part 5 a or the outer side of the pair of gathers 5, 5. It is preferable to arrange in the part 5c.
In addition, the interval between the plurality of elastic members 13 is preferably 3 to 10 mm, and more preferably 4 to 7 mm, from the viewpoint of keeping the three-dimensional shape of the gather 5 well.
The number of the plurality of elastic members arranged on the sheet-like member 9 is preferably 4 to 10 from the viewpoint of stably maintaining the three-dimensional shape of the gathers 5. When the number of the elastic members 13 is 3 or less, it is difficult to form a substantially Ω shape, and there is a possibility that it will be difficult to exhibit the effect of preventing the side leakage. When the number of the elastic members 13 is 11 or more, the rigidity of the gather 5 is increased, and the touch may be deteriorated.

It is preferable that the tension at the time of disposing the plurality of elastic members 13 on the sheet-like member 9 is gradually increased from the top portion 5b in the three-dimensional gather 5 toward the inner side portion 5a and the outer side portion 5c. By gradually strengthening from the top portion 5b toward the inner side portion 5a and the outer side portion 5c, it is possible to configure the gather 5 that is less likely to fall down against the force in the width direction.
Moreover, it is preferable that the tension | tensile_strength difference of the some elastic member 13 arrange | positioned is less than 300 gf / 25mm.

Each of the plurality of elastic members 13 has a chromatic color, and the chromatic color in each of the plurality of elastic members 13 is visible through the sheet-like member 9. In the present embodiment, each of the plurality of elastic members 13 is blue as a chromatic color. The color of the plurality of elastic members 13 is not particularly limited as long as it is a color other than white, but is preferably a color that exhibits cleanliness as well as visibility.
Further, from the viewpoint of making the chromatic color of the elastic member 13 easily visible through the sheet-like member 9, the color of the sheet-like member 9 is a color that easily transmits chromatic colors such as transparent, translucent, and white. It is preferable.

  As described above, in the gather 5 having a three-dimensional shape, the plurality of chromatic color elastic members 13 are visible through the sheet-like member 9, thereby forming a free end portion as in the present embodiment. Even if it is not gathered, the three-dimensional feeling of the convex three-dimensional structure is transmitted to the skin contact surface side to the wearer before use, so there is a sense of security for the side of the sanitary napkin 1 (security for side leakage) As a result, it is possible to give the wearer a sense of security of the sanitary napkin 1 itself.

As shown in FIG. 4, each of the pair of gathers 5 and 5 has a two-layer structure portion formed by folding the sheet-like member 9. The plurality of elastic members 13 are disposed so as to be sandwiched between the outer layer 9a and the inner layer 9b in the two-layer structure portion.
In the present embodiment, the two-layer structure portion is formed over the entire inner side portion 5a, the entire top portion 5b, and the upper side of the outer side portion 5c in the gather 5. The six elastic members 13 are all disposed so as to be sandwiched between the outer layer 9a and the inner layer 9b in the two-layer structure portion. The outer layer 9a and the inner layer 9b are joined via a hot melt adhesive applied to the plurality of elastic members 13.

  The gather 5 including the sheet-like member 9 and the plurality of elastic members 13 preferably has appropriate rigidity from the viewpoint of stably maintaining the hollow three-dimensional shape and obtaining a good wearing feeling, but the rigidity is too high. There is a risk that the feeling of wearing at the time of wearing will deteriorate.

  The elastic properties of the gather 5 are such that the stress when the gather 5 is stretched 5 to 50% in the longitudinal direction of the sanitary napkin 1 is preferably 50 to 500 gf / 25 mm width, more preferably 100 to 300 gf / 25 mm width. is there. When the stress is less than 50 gf / 25 mm width, the elastic force of the gather 5 is weak, and the standing property of the gather 5 may be deteriorated. When the stress exceeds 500 gf / 25 mm width, the sanitary napkin 1 is strongly curved in the longitudinal direction, and the fit with the wearer's body may be reduced.

Next, the preferable numerical range in each structure of the sanitary napkin of this embodiment is demonstrated.
The length L1 of the sheet-like member 9 from the first joint end 10a to the second joint end 10b in the three-dimensionally shaped portion 10 is preferably 16 to 58 mm, more preferably from the viewpoint of securing the standing height of the gathers 5. Is 30-58 mm. The standing height of the gather 5 is preferably 10 to 30 mm, more preferably 15 to 25 mm. When the standing height T of the gather 5 is less than 10 mm, the side leakage prevention effect may be reduced, and the wearer may not be provided with a sense of security that it has a sufficient side leakage prevention function. There is. When the standing height T of the gather 5 is higher than 30 mm, the fit property of the gather 5 to the wearer's body becomes excessively strong, and the fit property between the absorbent body 4 and the wearer's body may be reduced.

  The distance L2 between the joint ends, which is the distance between the first joint end 10a and the second joint end 10b, is preferably 5 to 20 mm, more preferably, from the viewpoint of forming the gathers 5 with excellent uprightness. 5 to 15 mm. When the distance L2 between the joining ends is less than 3 mm, the gather 5 may easily fall down due to a force applied from the width direction of the sanitary napkin 1. Thus, when the gather 5 falls down, there exists a possibility that the absorption surface of the absorber 4 may be covered by the fallen gather 5. If the distance L2 between the joining ends exceeds 20 mm, it is difficult to form a hollow portion in the gather 5, and a gap is likely to be formed between the gather 5 and the wearer's body, which may reduce the leakage prevention effect. The maximum width L3 in the three-dimensional shape of the gather 5 is the first joint end 10a and the second joint end 10b from the viewpoint of preventing the gather 5 from being easily deformed by the force applied from the width direction of the sanitary napkin 1. It is necessary to be larger than the distance L2 between the joint ends, which is the distance between the two, specifically 5 to 38 mm, more preferably 6 to 30 mm.

  The distance L4 between the outer end 12a and the first joint end 10a in the third joint 12 is preferably 25 to 35 mm. When the distance L4 between the outer end 12a and the first joint end 10a in the third joint 12 exceeds 35 mm, the contact area between the sheet-like member 9 constituting the gather 5 and the wearer's skin is large. There is a risk that the feeling of wearing becomes worse.

The constituent material of the sanitary napkin 1 of this embodiment is demonstrated.
As the surface sheet 2, for example, a porous or non-porous nonwoven fabric or a porous plastic sheet can be used. As the back sheet 3, for example, a hydrophobic nonwoven fabric, a water-impermeable plastic film, or a laminate sheet of a nonwoven fabric and a water-impermeable plastic film can be used. Further, as the back sheet 3, an SMS nonwoven fabric sandwiched between a melt-blown nonwoven fabric having high water resistance or a strong spunbond nonwoven fabric can also be used.

As the absorber 4, what consists of a fluffy pulp, an airlaid nonwoven fabric, and a superabsorbent polymer can be used, for example.
Examples of the fluffy pulp used for the absorbent body 4 include artificial cellulose fibers such as chemical pulp, cellulose fibers, rayon, and acetate. As an airlaid nonwoven fabric, the thing which heat-fused the pulp and the synthetic fiber or fixed it with the binder is mentioned. Examples of the superabsorbent polymer include starch-based, acrylic acid-based, and amino acid-based particulate or fibrous polymers.

  As the sheet-like member 9, those having water repellency or hydrophobicity are preferably used. Specifically, various materials such as a spunlace nonwoven fabric, a spunbond nonwoven fabric, a thermal bond nonwoven fabric, a melt blown nonwoven fabric, a needle punched nonwoven fabric, and an air-through nonwoven fabric are used. Nonwoven fabric can be used. As the material fibers constituting the nonwoven fabric, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used.

  The elastic member 13 may be any material that is elongated and expands and contracts, and a thread-like rubber made of natural rubber, a flat rubber, or the like, or a thermoplastic elastomer such as urethane, ethylene-vinyl acetate copolymer (EVA), or PE is used. be able to. More specifically, examples of the thermoplastic elastomer include polybutadiene, polyisoprene, styrene-butadiene copolymer, styrene-isoprene copolymer, polyurethane, ethylene-vinyl acetate copolymer, ethylene-α olefin copolymer, and the like. Examples include those formed into a thread shape or formed into a film and slit into a narrow width.

  The sanitary napkin 1 of the present embodiment having the above-described configuration has its vertically long body portion disposed on the inner surface of the crotch portion in an underwear such as shorts, and the pair of wings 6 and 6 are folded back to the outer surface side of the crotch portion. Fixed to. The sanitary napkin 1 and the underwear include a main body adhesive portion 15 provided on the lower surface of the main body portion and an inner surface of the crotch portion, and wing adhesive portions 14 and 14 provided on the lower surfaces of the pair of wings 6 and 6. It is fixed by being fixed to the outer surface of the crotch part.

  According to the sanitary napkin 1 of the present embodiment, the first joint end portion 10a in the three-dimensional shape portion 10 forming the gather 5 is located in a region where the absorber 4 in the surface layer that is a high-rigidity region is disposed, In the region where at least the pair of wings 6 and 6 are disposed, the second joint end portion 10b is a region on the outer side in the width direction from the outer edge of the absorber 4 in the surface layer and / or the back surface layer which is a low rigidity region. Located on the top. Thus, the sanitary napkin 1 of this embodiment has the three-dimensional shape which has a hollow part because the 1st junction end part 10a is located in a highly rigid area | region, and the 2nd junction end part 10b is located in a low rigidity area | region. The standing stability of the gather 5 is improved.

When the sanitary napkin 1 is worn, various forces are applied to the sanitary napkin 1. In particular, when the wing 6 is folded back and secured to the outer surface of the crotch portion such as shorts, the wing 6 is pulled outward in the width direction, so that a strong force is also applied to the sanitary napkin 1 outward in the width direction. . Thus, when a strong force is applied outward in the width direction, according to the sanitary napkin 1 of the present embodiment, the inner side portion 5a located on the first joint end portion 10a side of the gather 5 is Since the joining end 10a is located in the high rigidity region, it is difficult to be affected by the force applied in the width direction.
On the other hand, the outer side portion 5c located on the second joint end portion 10b side easily changes its shape with respect to the force applied in the width direction because the second joint end portion 10b is located in the low rigidity region. Absorb the applied force.

As described above, the outer side portion 5c of the gather 5 is easily deformed, and on the other hand, the inner side portion 5a is not easily affected by the force applied to the sanitary napkin 1, whereby a strong force outward in the width direction is obtained. Even when added, the entire gather 5 having the hollow portion is less likely to fall outward in the width direction, so that the standing stability of the gather 5 is improved and the side leakage preventing effect is improved.
Further, when a force inward in the width direction is applied to the sanitary napkin 1, the entire gather 5 is unlikely to fall inward in the width direction by the same action as described above.

  On the other hand, in the conventional gather, the gather often fell outward due to the force pulled outward in the width direction. Then, the gathers may be worn on the wearer's body in a fallen state, causing side leakage.

  In particular, in the sanitary napkin 1 provided with the wing 6 and the gather 5 having a three-dimensional shape, when the gather 5 and the wing 6 are formed from one sheet-like member 9, the width of the wing 6 is reduced when the wing 6 is folded back. The force pulling outward in the direction is easily transmitted to the gather 5 integrally formed with the wing 6, and the gather 5 easily falls down in the width direction. According to the sanitary napkin 1 of the present embodiment, Even when the gathers 5 and the wings 6 are formed from one sheet-like member 9, the three-dimensional gathers 5 having hollow portions are not easily collapsed and are excellent in standing stability.

  Furthermore, since the interior of the three-dimensional shape of the gather 5 is hollow, the three-dimensional shape of the gather 5 flexibly follows the movement of the wearer's body while the gather 5 fits the wearer's body in a planar shape. The leakage from the width direction of the sanitary napkin 1 can be effectively prevented. Further, when a force in the width direction is applied to the sanitary napkin 1, the three-dimensional gather 5 having a hollow portion absorbs and buffers the applied force, and the force applied to the absorbent body 4 can be reduced. As a result, the absorbent body 4 is not easily deformed, and the fit of the sanitary napkin 1 to the wearer's body is improved.

  Moreover, the junction part 11 is the 1st junction part 11a formed in the inner side of the width direction in the sanitary napkin 1, and the 2nd junction part 11b formed in the outer side of the width direction rather than this 1st junction part 11a. The first joint end 10a is formed in the first joint 11a, and the second joint end 10b is formed in the second joint 11b. As described above, the first joint end portion 10a and the second joint end portion 10b are formed in different (separated) joint portions, whereby the inner side portion 5a of the gather 5 has a force applied in the width direction. It becomes harder to be affected, the gathers 5 are more unlikely to fall down, and the side leakage prevention effect is improved.

  Further, the length L1 from the first joint end 10a to the second joint end 10b in the three-dimensionally shaped portion 10 forming the gather 5 and the distance between the first joint end 10a and the second joint end 10b. When the ratio between the joint end portion distance L2 is 2 or more, the three-dimensional shape of the pair of gathers 5 and 5 is stably formed, and even when force is applied to the sanitary napkin 1 from the width direction. Gather 5 is hard to fall down.

  Moreover, since the cross-sectional shape in the width direction of the gather 5 has a substantially Ω shape in which the maximum width L3 in the three-dimensional shape of the gather 5 is larger than the distance L2 between the joining ends, the gathering property of the gather 5 Will improve.

  Further, since the distance L2b between the joining ends in the vicinity of both ends in the longitudinal direction of the sanitary napkin 1 is made larger than the distance L2a between the joining ends in the longitudinal center of the sanitary napkin 1, A force pulled in the width direction is strongly applied from the central portion toward both ends. Therefore, the standing stability in the center portion in the longitudinal direction of the three-dimensional gather 5 is further improved, and the gather 5 is unlikely to fall down. Furthermore, in the present embodiment, since the pair of wings 6 and 6 are provided in the longitudinal center portion having high standing stability, when the sanitary napkin 1 is mounted, the pair of wings 6 and 6 are out of the width direction. Even when force is applied toward the direction, the gathers 5 are unlikely to fall outside.

  Moreover, the 3rd junction part 12 which joins a sheet-like member to a surface layer or a back surface layer in the width direction outer side rather than a junction part is formed in the both ends of each longitudinal direction in a pair of gathers 5 and 5, The distance L4 between the outer end of the three joints 12 and the first joint end 10a is formed to be longer than the distance L2a between the joint ends at the longitudinal center of the sanitary napkin 1. As a result, the gather 5 is further subjected to a force that is pulled in the width direction from the central portion toward both ends. Therefore, the standing stability of the three-dimensional gather 5 is further improved, and the gather 5 is more unlikely to fall down.

  Further, the center of the joint portion 11 in the width direction is located inward in the width direction with respect to the center between the outer end portion of the third joint portion 12 and the first joint end portion 10a, so that the three-dimensional shape of the gather 5 is obtained. The shape has a substantially Ω shape that is inclined outward in the width direction from the lower end to the upper end. That is, the pair of gathers 5 and 5 has an inverted C shape. By having the pair of gathers 5 and 5 have an inverted C shape, the side leakage preventing effect of the sanitary napkin 1 is improved.

  Each of the pair of gathers 5 and 5 has a plurality of elastic members 13, and the plurality of elastic members 13 are arranged on the surface or inside of the sheet-like member 9 and arranged along the longitudinal direction. Thus, the three-dimensional shape having the hollow portion of the gather 5 can be stably maintained.

  Moreover, the three-dimensional shape which has the hollow part of the gathers 5 can be maintained more stably by arrange | positioning all or one part in the some elastic member 13 in each side part of a pair of gathers 5 and 5. FIG.

  Each of the pair of gathers 5 and 5 has a two-layer structure portion formed by folding the sheet-like member 9, and the plurality of elastic members 13 are arranged so as to be sandwiched between layers of the two-layer structure portion. As a result, the gather 5 in which the plurality of elastic members 13 are arranged has appropriate rigidity, so that the standing stability of the gather 5 is improved.

  Moreover, when the leak-proof groove 8 has a shape curved in a convex shape outward in the width direction at the center portion A, when the force is received from the width direction of the sanitary napkin 1, the excretory portion facing region In the central part A, the standing stability of the gathers 5 is further improved, and the side leakage prevention effect is improved. Furthermore, the absorber 4 easily rises to the skin contact surface side of the wearer due to the force received from the width direction, and there is an effect that the adhesion between the absorber 4 and the excretion part of the wearer is improved.

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, in the present embodiment, the second joint end portion 10b is located on the back sheet 3 on the outer side in the width direction from the side edge in the longitudinal direction of the absorbent body 4 over substantially the entire length of the sanitary napkin 1 in the longitudinal direction. However, at least in the central portion A where the excretory part is opposed, that is, in the region where the wings 6 are disposed, it is arranged outward in the width direction from the side edge in the longitudinal direction of the absorbent body 4. It only has to be done.

  In the present embodiment, the pair of gathers 5 and 5 has a plurality of elastic members 13 disposed on the sheet-like member 9. You may use the sheet | seat etc. which have. Further, the pair of gathers 5 and 5 may be formed of a sheet-like member that does not have elasticity.

  In the present embodiment, the gather 5 and the wing 6 are integrally formed by a single sheet-like member 9, but the wing 6 is constituted by a sheet different from the sheet-like member that constitutes the gather 5. May be.

  The absorbent article of the present invention may be an incontinence pad, a panty liner, a disposable diaper or the like in addition to a sanitary napkin.

DESCRIPTION OF SYMBOLS 1 Sanitary napkin 2 Top sheet 3 Back sheet 4 Absorber 5 Gather 6 Wing 7 Back flap 8 Leak-proof groove 9 Sheet-like member 10 Three-dimensional shape part 11 Joint part 12 3rd junction part 13 Elastic member

Claims (5)

A vertically long body comprising a top layer having a top sheet, a back layer having a back sheet, and an absorbent layer having a liquid-retaining absorbent disposed therebetween, and both longitudinal sides of the body A vertically long absorbent article comprising a pair of leak-proof gathers formed to be spaced apart from each other and configured to have a hollow portion by a sheet-like member,
Each said pair of leak-barrier gather, the sheet-shaped member, and the three-dimensional shape portion which is formed so as to constitute a convex and Do Ri said hollow portion to the skin contacting side of the absorbent article,
A bonding portion for bonding the three-dimensional shape portion to the front surface layer and / or the back surface layer ,
The leak-proof gather is a part facing the excretion part of the wearer and a cross-sectional shape in the width direction of the center part located at the approximate center in the longitudinal direction of the absorbent article and the front part and / or the rear part side And the height at the central portion is higher than the height at the front portion and / or the rear portion,
The joint is formed to extend in the longitudinal direction of the absorbent article, and a first joint end located on a region of the surface layer where the absorber is disposed ;
The absorbent article is formed so as to extend in the longitudinal direction of the absorbent article and is more rigid than the first joint end without being disposed on the outer side in the width direction of the three-dimensionally shaped part than the first joint end. Having a second joining end located in a low region,
The distance between the said 1st junction end part and the said 2nd junction end part in the said front part and the said back part side is an absorbent article larger than the said distance in the said center part . Prior Symbol three-dimensional shape portion, the than the distance between the first connecting end and the second connecting end, absorption according to claim 1 having a substantially ohmic shape a larger maximum width in the three-dimensional shape portion Sex goods. The back surface layer further comprises a pair of wings formed to extend outward in the width direction of the absorber,
The sheet-like member has a portion extending outward in the width direction from a side edge portion of the absorber, and the extended portion of the sheet-like member is a side edge portion of the absorber in the back sheet. The absorbent article according to claim 1 or 2, wherein the absorbent article is joined to a portion extending more outward in the width direction to form part of the pair of wings. The leakproof gather has a two-layer structure part formed by folding the sheet-like member,
The absorbent article of any one of Claims 1-3 arrange | positioned so that a some elastic member may be inserted | pinched between the outer layer and inner layer of this 2 layer structure part. The two-layer structure portion is formed at the joint portion,
The absorbent article according to claim 4, wherein the sheet-like member formed in four layers is joined at the first joining end portion by further folding the sheet-like member over the two-layer structure portion. .

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