JP2021045320A - Absorbent article - Google Patents

Abstract

To prevent body fluid from leaking by suppressing three-dimensional gathers from swelling to a width direction inner side.SOLUTION: An absorbent article is such that: a gather sheet 7 forming a hollow loop-shaped three-dimensional gather 10 projecting to the skin side of a wearer is disposed in each of both side parts in the longitudinal direction at a skin-contact surface side; an elastic stretching member 15 is fixed to the gather sheet 7 in each of a front end part and a rear end part of the gather sheet 7; end part fixing parts 11, 12 in which a folding part of the gather sheet 7 is fixed to an absorber side are formed; non-stretching parts 13, 14 in which the elastic stretching member 15 is fixed to the gather sheet 7 are formed between the end part fixing parts 11, 12 and the loop-shaped three-dimensional gathers 10; and in the loop-shaped three-dimensional gather 10, stretching force effective length allowing the elastic stretching member 15 to exhibit stretching force is longer in the elastic stretching member arranged at a width direction outer side than in the elastic stretching member arranged at width direction inner side.SELECTED DRAWING: Figure 2

Description

The present invention mainly relates to absorbent articles such as sanitary napkins, vaginal discharge sheets, incontinence pads, and toiletries, and more specifically, hollow loops protruding toward the skin on both sides in the longitudinal direction on the skin contact surface side. The present invention relates to an absorbent article in which a three-dimensional gather is formed.

Conventionally, the absorbent article is made of cotton-like pulp or the like between a liquid-impermeable back sheet such as a polyethylene sheet or a polyethylene sheet laminated non-woven fabric and a liquid-permeable front sheet such as a non-woven fabric or a permeable plastic sheet. Those with an absorber are known.

Especially in sanitary napkins for night use, in order to prevent lateral leakage of body fluids such as menstrual blood flowing in the width direction and leaking from the side edges during wearing, the skin is on both sides in the longitudinal direction on the skin contact surface side, respectively. Many of them have three-dimensional gathers protruding to the side and are offered on the market.

As the three-dimensional gather, the inner side portion in the width direction of the non-woven fabric for gather formation is folded in two or three in the width direction and fixed to the absorber side at both ends in the longitudinal direction of the absorbent article, thereby being fixed to the absorber side in the longitudinal direction. There is an upright wall-shaped three-dimensional gather that stands up on the skin side so that the tip forms a free end in the middle part. Further, in Patent Documents 1 and 2 below, a planar elastic elastic portion that is connected to the upper end portion of the base wall portion and comes into contact with the wearer's skin when worn is included to form a substantially T-shaped cross section. The three-dimensional gathers that stand up like this are disclosed.

Further, in addition to this, a loop-shaped three-dimensional gather (for example, Patent Documents 3 and 4 below) that protrudes toward the skin so as to form a hollow loop is also widely known.

Patent No. 3871563 Public Relations Japanese Patent No. 5395630 Japanese Patent No. 5123583 Japanese Patent No. 5119041

The above-mentioned two-fold or three-fold upright wall-shaped three-dimensional gathers and the above-mentioned three-dimensional gathers having a substantially T-shaped cross section disclosed in Patent Documents 1 and 2 have an advantage that the upright height toward the skin can be increased. However, it has a drawback that it easily falls down in the width direction, and when it is worn in a fallen state, body fluid leaks and a feeling of strangeness occurs. As a technique for preventing such a fall in the width direction, in Patent Document 1, a plurality of elastic members arranged along a longitudinal direction on a planar elastic expansion / contraction portion have a contraction force inside in the width direction. It is described that the elastic force is made larger than the contraction force on the outer side in the width direction and is curved so as to be convex outward. In Patent Document 2, the elastic elastic member is absorbed in the central region in the longitudinal direction of the leakage-proof wall. It is described that the central region elastic stretchable portion fixing portion is locally formed, which is fixed to the main body and the standing of the base wall portion is hindered.

However, even if the contraction force of the elastic members inside and outside in the width direction is changed as described in Patent Document 1, the three-dimensional gathers are difficult to bend in the width direction, and it is sufficiently satisfactory to prevent the elastic members from falling in the width direction. In some cases, it did not reach.

Further, in Patent Document 2, since the central region elastic expansion / contraction portion fixing portion is locally formed, the standing of the three-dimensional gather is hindered at this fixing portion, and the adhesion to the skin at this fixing portion is lowered. There was a risk of leakage.

On the other hand, the loop-shaped three-dimensional gathers as described in Patent Documents 3 and 4 are less likely to collapse in the width direction, but the loop-shaped three-dimensional gathers are easily crushed by the body pressure at the time of wearing, and particularly the body fluid. By receiving leg pressure from the outside in the width direction at the discharge portion, the loop-shaped three-dimensional gathers are likely to be deformed to bulge inward in the width direction. If such deformation occurs inward in the width direction, leakage may occur when the amount of body fluid discharged is large.

Therefore, the main problem of the present invention is to obtain an absorbent article having hollow loop-shaped three-dimensional gathers, which prevents the leakage of body fluid by suppressing the three-dimensional gathers from bulging inward in the width direction. To provide.

In order to solve the above problem, as a first aspect, the inner side portion in the width direction is folded in the width direction on both sides in the longitudinal direction on the skin contact surface side, and the folded portion is folded along the longitudinal direction and in the width direction. By arranging a plurality of elastic elastic members at intervals, a hollow loop-shaped three-dimensional gather that protrudes toward the wearer's skin is formed in a longitudinal section including a region corresponding to the wearer's body fluid discharge portion. The seat member is arranged,
The elastic elastic member is fixed to the seat member at the front end portion and the rear end portion of the seat member, respectively, and an end fixing portion in which the folded portion of the seat member is fixed to the absorber side is formed. The loop-shaped three-dimensional gather is formed in the intermediate portion in the longitudinal direction of the seat member, and the elastic stretchable member is fixed to the seat member between the end fixing portion and the loop-shaped three-dimensional gather, respectively. Is formed,
In the loop-shaped three-dimensional gather, the effective elastic length at which the elastic elastic member expresses elastic force is longer in the elastic elastic member arranged outside in the width direction than in the elastic elastic member arranged inside in the width direction. Absorbent articles that have become are provided.

In the first aspect, end fixing portions are formed at the front end portion and the rear end portion of the seat member, respectively, and the loop-shaped three-dimensional gathers are formed at the intermediate portion in the longitudinal direction, and the end fixing portion and the loop are formed. Non-stretchable portions are formed between the three-dimensional gathers. That is, the loop-shaped three-dimensional gathers in the middle portion in the longitudinal direction project toward the skin side with the end fixing portions of the front and rear ends as the base ends, and the elastic force of the elastic elastic member is exhibited between the loop-shaped three-dimensional gathers and the end fixing portions. There is a non-stretchable portion that suppresses the property and allows the seat member to move freely without being fixed. Then, in the loop-shaped three-dimensional gather, the elastic stretchable member arranged on the outer side in the width direction has a longer effective stretchable force on which the elastic stretchable member expresses the stretchable force than the elastic stretchable member arranged on the inner side in the width direction. It has become. For this reason, the loop-shaped three-dimensional gather acts on a section where the elastic force of the elastic elastic member is longer on the outer side in the width direction, and is more likely to bulge and deform outward in the width direction. Since the non-stretchable portion in which the elastic force of the elastic stretchable member is suppressed and the restraint of the seat member is reduced is provided between the elastic stretchable member and the end fixing portion, the non-stretchable portion is a cushioning region. Therefore, the loop-shaped three-dimensional gather in the center is less likely to be restricted by the end fixing portion, and can move relatively freely. As a result, the loop-shaped three-dimensional gathers are likely to bulge and deform outward in the width direction, the three-dimensional gathers can be prevented from falling inward in the width direction, and the leakage of body fluid can be prevented.

As a second aspect, at least the front non-stretchable portion has a non-stretchable length that is a length along the longitudinal direction of the absorbent article of the non-stretchable portion, which is longer in the width direction than in the outer side in the width direction. Absorbent articles are provided.

In the second aspect, at least in the front non-stretchable portion, the non-stretchable length is set to be longer on the inner side in the width direction than on the outer side in the width direction. By increasing the non-stretchable length, the degree of freedom of deformation of the adjacent loop-shaped three-dimensional gathers is increased, and the inside of the loop-shaped three-dimensional gathers in the width direction is more likely to bulge and deform more than the outside in the width direction. Further, by forming at least the non-stretchable portion on the front side in this way, deformation that bulges outward is likely to occur in the front side portion of the loop-shaped three-dimensional gather, and leakage in the front side portion can be more reliably prevented. Become.

As a third aspect, an absorbent article is provided in which the edge of the end fixing portion on the central side in the longitudinal direction is formed by a straight line substantially parallel to the width direction.

In the third aspect, the edge of the end fixing portion on the central side in the longitudinal direction is formed by a straight line substantially parallel to the width direction. In this form, by forming the edge of the loop-shaped three-dimensional gather in an inclined shape, the non-stretchable length of the non-stretchable portion is longer in the width direction than in the outside in the width direction, and the loop-shaped three-dimensional gather is formed inside in the width direction. The degree of freedom of deformation can be increased.

As a fourth aspect, an absorbent article is provided in which the edge of the end fixing portion on the central side in the longitudinal direction is inclined toward the outer side in the width direction toward the central side in the longitudinal direction.

In the fourth aspect, since the edge of the end fixing portion on the central side in the longitudinal direction is formed in an inclined shape so as to be inclined toward the central side in the longitudinal direction toward the outside in the width direction, the end of the loop-shaped three-dimensional gathers. Even if the edges are not formed in a slanted shape, the non-stretchable length of the non-stretchable portion can be made longer on the inner side in the width direction than on the outer side in the width direction, and more reliably, the loop-shaped solid gather on the inner side in the width direction. The degree of freedom of deformation can be increased.

As a fifth aspect, wing-shaped flaps are formed on both side portions so as to wrap around the crotch portion of the underwear when worn, and on both side portions behind this, the inner surface of the buttocks of the underwear is formed. A hip hold flap that is fixed to the side is formed,
Among the elastic stretchable members arranged in the loop-shaped three-dimensional gather, the elastic stretchable member arranged on the innermost side in the width direction has a front end located on the front side of the front end edge of the wing-shaped flap and a rear end thereof. The elastic elastic member located on the rear side of the rear end edge of the wing-shaped flap and arranged on the outermost side in the width direction has the rear end on the front side of the maximum protrusion in the width direction of the hip hold flap. An absorbent article located is provided.

In the fifth aspect, among the elastic elastic members arranged in the loop-shaped three-dimensional gather, the front end and the rear end of the elastic elastic member arranged on the innermost side in the width direction are the front end edge and the rear side of the wing-shaped flap, respectively. It is located outside the edge, and the rear end of the elastic elastic member arranged on the outermost side in the width direction is located in front of the maximum protrusion in the width direction of the hip hold flap. As a result, in the region corresponding to the body fluid discharge portion of the wearer, the loop-shaped three-dimensional gathers are likely to be deformed to bulge outward in the width direction, and the fit in the buttocks is improved.

As described in detail above, according to the present invention, it is possible to suppress the bulging of the three-dimensional gathers inward in the width direction, thereby preventing the leakage of body fluid.

It is a partially broken development view of the sanitary napkin 1 which concerns on this invention. FIG. 2 is a view taken along the line II-II of FIG. FIG. 3 is a view taken along the line III-III of FIG. FIG. 5 is an enlarged cross-sectional view (FIG. IV-IV arrow view of FIG. 1) showing an inward portion in the width direction of the gather sheet 7 in a loop-shaped three-dimensional gather 10 portion in a state where the elastic elastic member is stretched. It is an enlarged cross-sectional view (the VV line arrow view of FIG. 1) which shows the inner side part in the width direction of the gather sheet 7 in the end part fixing part 11, 12. It is an enlarged cross-sectional view (VI-VI line arrow view of FIG. 1) which shows the inner side part in the width direction of the gather sheet 7 in the non-expandable part 13 and 14. It is a top view of the sanitary napkin 1 which shows each joint part. It is a perspective view which shows the joint state of the inner side portion in the width direction of a gather sheet 7. It is a developed view of the sanitary napkin 1 which concerns on the modification. It is a developed view of the sanitary napkin 1 which concerns on the modification. It is a developed view of the sanitary napkin 1 which concerns on the modification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Basic structure of sanitary napkin 1]
As shown in FIGS. 1 to 3, the sanitary napkin 1 according to the present invention includes an impermeable back sheet 2 made of a polyethylene sheet or the like, menstrual blood, vaginal discharge, or the like (hereinafter, collectively referred to as a body fluid). ), A absorbent body 4 made of cotton-like pulp or synthetic pulp sandwiched between these two sheets 2 and 3, and a length on both sides on the skin contact surface side. It is provided over almost the entire length in the direction, and within a predetermined section in the longitudinal direction of the napkin including a region corresponding to at least the body fluid discharge portion H of the wearer, with the substantially side edge portion of the absorber 4 as the standing base end ( It is provided with gather sheets 7 and 7 (seat members) forming a pair of left and right loop-shaped three-dimensional gathers 10 and 10 protruding toward the skin in the section corresponding to the lower crotch of the wearer, and around the absorber 4. In the front and rear edge portions thereof, the outer edge portions of the impermeable back sheet 2 and the liquid permeable surface sheet 3 are joined by an adhesive such as hot melt or a joining means such as a heat seal or an ultrasonic seal. Further, at both side edges, the impermeable back sheet 2 extending laterally from the absorber 4 and the gather sheet 7 are joined to an adhesive such as hot melt, a heat seal, an ultrasonic seal, or the like. A pair of left and right wing-shaped flaps W and W extending outward are formed at the position on the side of the absorber that substantially corresponds to the body fluid discharge portion H, and both sides of the rear side (buttock side) of the flaps W and W are formed. a pair of left and right rear flaps W _B, respectively extending outwardly _section, in which W _B are formed. In the illustrated example, in order to maintain the shape of the absorber 4 and improve the diffusivity, the absorber 4 is surrounded by an encapsulating sheet 5 made of crepe paper, non-woven fabric, or the like. It does not have to be. Further, although not shown, a second sheet made of a hydrophilic non-woven fabric or the like having substantially the same shape as the liquid-permeable surface sheet 3 may be arranged adjacent to the non-skin side of the liquid-permeable surface sheet 3. ..

Hereinafter, the structure of the sanitary napkin 1 will be described in more detail.
As the liquid-impermeable back sheet 2, a sheet material having at least water-shielding property such as polyethylene is used, but it is desirable to use a sheet material having moisture permeability from the viewpoint of preventing stuffiness. The water-impervious / moisture-permeable sheet material has microporous properties obtained by melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet in the uniaxial or biaxial direction. Sheets are preferably used. One or more adhesive layers (not shown) are formed along the longitudinal direction of the napkin on the non-skin side surface (outer surface) of the impermeable back sheet 2, and the sanitary napkin 1 is attached to the body when worn. It is designed to be fixed to underwear. As the impermeable back sheet 2, a polylami non-woven fabric in which a plastic film and a non-woven fabric are laminated may be used.

Next, as the liquid-permeable surface sheet 3, a perforated or non-perforated non-woven fabric, a porous plastic sheet, or the like is preferably used. The material fibers constituting the non-woven fabric can be olefin-based fibers such as polyethylene or polypropylene, synthetic fibers such as polyester-based and polyamide-based, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A non-woven fabric obtained by an appropriate processing method such as a method, a spunbond method, a thermal bond method, a melt blown method, or a needle punching method can be used. Among these processing methods, the spunlace method is excellent in that it is rich in flexibility and drapeability, and the thermal bond method is excellent in that it is bulky and has high compression stability. When a large number of through holes are formed in the liquid-permeable surface sheet 3, the body fluid is rapidly absorbed, and the dry touch property is excellent. The fibers of the non-woven fabric may be either long fibers or short fibers, but it is preferable to use short fibers in order to give the texture of the towel cloth. Further, in order to facilitate the embossing treatment, it is preferable to use an olefin fiber such as polyethylene or polypropylene having a relatively low melting point. Further, a core-sheath type fiber having a fiber having a high melting point as a core and a fiber having a low melting point as a sheath, a side-by-side type fiber, and a composite fiber of a split type fiber can also be preferably used.

The absorber 4 interposed between the liquid-permeable back sheet 2 and the liquid-permeable front sheet 3 is composed of, for example, cotton-like pulp and a water-absorbent polymer. The water-absorbent polymer is mixed in the pulp constituting the absorber, for example, as granular powder. Examples of the pulp include cellulose fibers such as chemical pulp and dissolved pulp obtained from wood, and artificial cellulose fibers such as rayon and acetate. It is preferably used in terms of price. The basis weight of the absorber 4 is ^{preferably 300 to 750 g / m 2} , preferably 300 to 400 g / m ² .

In addition, synthetic fibers may be mixed with the absorber 4. As the synthetic fiber, for example, polyolefin-based such as polyethylene or polypropylene, polyester-based such as polyethylene terephthalate and polybutylene terephthalate, polyamide-based such as nylon, and copolymers thereof can be used, and these two types can be used. It may be a mixture. Further, composite fibers such as core-sheath type fibers having a high melting point fiber as a core and a low melting point fiber as a sheath, side-by-side type fibers, and split type fibers can also be used. In the case of hydrophobic fibers, it is desirable to use the synthetic fibers surface-treated with a hydrophilic agent so as to have an affinity for body fluids.

On the skin contact surface side of the absorber 4, the portion including the region corresponding to the body fluid discharge portion H of the wearer, which is the central portion in the width direction, is elongated in the longitudinal direction of the napkin and thickened toward the skin side. It is preferable to include the middle and high portions 6 of the absorber. The domed section 6 is generally provided from the fluid discharge portion H of the wearer to cover the site over the start position of the buttocks grooves provided in the longitudinal section from the wing-shaped flaps W to the middle portion of the rear flap W _B There is. The middle and high portions 6 may be formed by integrally stacking fibers with the absorber 4, or may be laminated separately. If the thickness of the middle and high portions 6 is too thick, the rigidity of the absorber 4 increases and the adhesion to the body decreases. Therefore, the thickness of the middle and high portions 6 is preferably 3 to 20 mm, preferably 5 to 15 mm. When the absorber 4 is surrounded by the encapsulating sheet 5, as shown in FIG. 2, the absorber 4 and the middle and high portions 6 may be integrally encapsulated, or the absorber 4 is not shown, but the absorber is not shown. 4 and the middle and high portions 6 may be separately surrounded by an encapsulating sheet and then laminated.

On the other hand, in the illustrated example, the width dimension of the liquid permeable surface sheet 3 is slightly longer than the width dimension of the absorber 4, as shown in the cross-sectional views of FIGS. It only covers, and the outer side is a gather sheet 7, which is different from the liquid-permeable surface sheet 3, specifically, it prevents menstrual blood, vaginal discharge, etc. from penetrating, or enhances the feel of the skin. A gather sheet 7 made of a non-woven fabric material which has been appropriately treated with water repellent or hydrophilic is arranged according to the purpose of the above.

As the gather sheet 7, a material formed of natural fiber, synthetic fiber, recycled fiber or the like by an appropriate processing method can be used, but preferably, the feeling of stiffness is eliminated and stuffiness is prevented. Therefore, it is preferable to use a soft non-woven fabric that suppresses the basis weight and has breathability. In particular, a non-woven fabric having a softness that feels good against the skin even if it comes into contact with the skin surface in a state of being highly projected toward the skin due to the contraction force of the elastic member is preferable. Specifically, it is desirable to use a non-woven fabric produced by the spunbond method having a basis weight of 13 to 23 g / m ^2, and in order to reliably prevent the permeation of body fluids, silicon-based, paraffin-based, and alkylchromic chlorides are used. A water-repellent treated non-woven fabric coated with a water-repellent agent or the like is preferably used.

As shown in FIGS. 2 and 3, the gather sheet 7 adheres hot melt or the like to the outer portion from the intermediate portion in the width direction over a range from a predetermined inner position to the outer edge of the impermeable back sheet 2. Adhesive with an agent, a predetermined flap portion is formed at a predetermined position. The flap portion is, a pair of left and right wing-shaped flaps W on both sides of the portion corresponding to the substantially fluid discharge portion H, to form a W, the rear flap W _B to the rear sides of which from the rear side (buttocks side), to form a W _B. The longitudinal section including the wing-shaped flap W corresponds to the wearer's inseam. These wing-shaped flaps W, W and rear flaps W _B, the outer surface side each pressure-sensitive adhesive layer (the liquid-impermeable back sheet 2 side) of the W _B (not shown) is provided, when worn for shorts, the wings folded on the opposite side Jo flaps W, the W at fold line RL position of the base end portion, as well as fastened is wound around the crotch portion of the shorts, so as to fasten the rear flap W _B to the inner surface of shorts There is.

[Loop-shaped three-dimensional gather]
The loop-shaped three-dimensional gather 10 is composed of a plurality of gathered sheets 7 in which the inner side portion in the width direction is substantially double-folded and a plurality of lines are fixed inside the double sheet at appropriate positions at both ends or in the longitudinal direction. In the illustrated example, four elastic elastic members 15, 15 ... Are arranged along the longitudinal direction of the sanitary napkin 1 and at predetermined intervals in the width direction, and the double sheet is appropriately folded to be predetermined. By joining the portions at the joint portion, the portions are formed in a hollow shape protruding toward the skin side of the wearer in the longitudinal section including the region corresponding to the body fluid discharge portion H of the wearer. As shown in FIG. 3, the elastic elastic member 15 ... Is fixed to the inner side portion of the gather sheet 7 in the width direction at the front end portion and the rear end portion, respectively, and the gather sheet 7 is appropriately folded. In this state, the front end fixing portion 11 and the rear end fixing portion 12 to which the folded portion is adhered to the absorber 4 side are formed, and the front end fixing portion 11 and the rear end fixing portion 12 are formed. The front non-stretchable portion 13 and the rear non-stretchable portion 14 in which the elastic elastic member 15 ... Are fixed to the gather sheet 7 are formed between the loop-shaped three-dimensional gathers 10, respectively, thereby causing at least the body fluid discharge portion H. As shown in FIG. 2, loop-shaped three-dimensional gathers 10 and 10 projecting toward the skin are formed in pairs on the left and right within a predetermined section in the longitudinal direction of the napkin corresponding to the inseam of the wearer including the napkin. As a result, the inner side portion in the width direction of the gather sheet 7 is fixed to the front end portion fixing portion 11, the front non-expandable portion 13, the loop-shaped three-dimensional gather 10, the rear non-expandable portion 14 and the rear end portion in order from the front side. The portions 12 are continuously formed.

More specifically, the structure of the inner side portion in the width direction of the gather sheet 7 will be described in more detail. The elastic elastic member 15 ... Is arranged along the longitudinal direction of the sanitary napkin 1, and as shown in FIGS. 4 to 6, in the widthwise cross-sectional view of the sanitary napkin 1, the outside of the sanitary napkin 1 in the width direction. In addition to extending inward in the width direction, the first folded portion 20 folded back toward the wearer's skin at the inner position in the width direction and the first folded portion 20 are continuously extended outward in the width direction. In addition, in a state of being folded in three by the second folded portion 21 folded back to the non-skin side of the wearer at the outer position in the width direction, the first seat portion 22 and the second seat portion are sequentially folded from the non-skin side of the wearer. The 23 and the third sheet portion 24 are formed. The elastic elastic member 15 ... Is mainly arranged on the third sheet portion 24.

Further, as shown in FIGS. 7 and 8, the wearer's non-skin side over the entire length in the longitudinal direction at a position where the first seat portion 22 is slightly outside the first folded portion 20 in the width direction. The first joint portion 25 to be joined to the member (liquid permeable surface sheet 3) arranged in the above and the second sheet portion 23 at a position closer to the second folded portion 21 over the entire length in the longitudinal direction. A second joint portion 26 for joining to the seat portion 22 and a third joint portion 27 for joining both ends of the third seat portion 24 in the longitudinal direction to the second seat portion 23 are provided. Further, in the present embodiment, a fourth joint portion 28 is provided for joining both ends of the first sheet portion 22 in the longitudinal direction to the liquid permeable surface sheet 3 at positions closer to the first folded portion 20. .. The boundary between the fourth joint portion 28 and the first joint portion 25 does not necessarily have to be clear, and may be connected in the width direction. In this case, the first joint 25 and the fourth joint are joined with an extension line extending the side edges of the first joint 25 to both ends in the longitudinal direction from the section where only the first joint 25 is present in the middle portion in the longitudinal direction. It can be distinguished from the part 28. 7 (A) is a plan view showing a joint portion (the first joint portion 25 and the fourth joint portion 28) between the first sheet portion 22 and the liquid permeable surface sheet 3, and FIG. 7 (B) is a plan view. A plan view showing a joint portion between the second sheet portion 23 and the first sheet portion 22 (the second joint portion 26), FIG. 7 (C) shows the joint portion between the third sheet portion 24 and the second sheet portion 23 (the joint portion (the second joint portion 26)). It is a top view which shows the 3rd joint part 27).

Then, in the longitudinal section between the third joints 27, 27 provided at both ends in the longitudinal direction, at least the third sheet portion 24 is worn with the first joint 25 and the second joint 26 as the base ends. A hollow loop-shaped three-dimensional gather 10 protruding toward the skin side of the person is formed. That is, the loop-shaped three-dimensional gather 10 projects toward the skin so as to form a hollow loop shape with the two first joints 25 and the second joints 26 separated in the width direction as the base ends.

In the widthwise inner side portion of the gather sheet 7 configured as described above, the front end portion and the rear end portion are designated as the front end portion fixing portion 11 and the rear end portion fixing portion 12, respectively, in FIG. As shown in the above, the elastic elastic member 15 ... Is fixed inside the double sheet of the gather sheet 7 by an adhesive over the entire length, so that the elastic elastic member 15 ... Is suppressed from being stretched. The double sheet of the gather sheet 7 is fixed to the absorber 4 side by the third joint portion 27 in a state of being appropriately folded, so that the deformation of the gather sheet 7 is suppressed. The front end fixing portion 11 and the rear end fixing portion 12 are formed continuously at a predetermined length from the front end and the rear end of the sanitary napkin 1 to the central side in the longitudinal direction of the napkin, respectively. The length of the front end fixing portion 11 and the rear end fixing portion 12 along the longitudinal direction of the napkin is arbitrary, but as shown in FIG. 1, the rear end fixing portion 12 is the front end portion. It is preferably longer than the fixed portion 11.

Further, the front non-stretchable portion 13 and the rear non-stretchable portion 14 which are continuously formed on the rear side of the front end portion fixing portion 11 and the front side of the rear end portion fixing portion 12, respectively, are shown in FIG. As described above, the elastic elastic member 15 ... Is fixed inside the double sheet of the gather sheet 7 with an adhesive over the entire length, so that the elastic elastic member 15 ... Is suppressed from being exhibited. On the other hand, the gather sheet 7 is only joined by the first joint portion 25 and the second joint portion 26 in the same manner as the loop-shaped three-dimensional gather 10 portion, and is deformed as compared with the loop-shaped three-dimensional gather 10 portion. The degree of freedom is slightly reduced by joining the elastic elastic members 15 ... However, the degree of restraint is not increased by joining the sheets themselves, and the degree of freedom of deformation almost the same as that of the loop-shaped three-dimensional gather 10 portion is secured. Has been done.

The loop-shaped three-dimensional gather 10 formed in the region sandwiched between the front non-stretchable portion 13 and the rear non-stretchable portion 14 protrudes toward the wearer's skin side by the elastic force of the elastic stretchable member 15 ... And has a hollow loop shape. Form a three-dimensional gather. The loop-shaped three-dimensional gather 10 projects toward the skin with the front end fixing portions 11 and the rear end fixing portions 12 at both ends as base ends, and these fixing portions 11 and 12 and the loop-shaped three-dimensional gather 10 Since the front non-stretchable portion 13 and the rear non-stretchable portion 14 are interposed between them, the front non-stretchable portion 13 and the rear non-stretchable portion 14 serve as a buffer region, and the fixing portions 11 and 12 serve as a buffer region. The influence of the restraint on the loop-shaped three-dimensional gather 10 is reduced, and the degree of freedom of deformation of the loop-shaped three-dimensional gather 10 is increased.

As shown in FIG. 1, in the loop-shaped three-dimensional gather 10, the effective elastic length at which the elastic elastic member 15 ... expresses the elastic force is arranged outside the elastic elastic member 15 arranged inside in the width direction. The elastic elastic member 15 is longer. In the illustrated example, of the four elastic elastic members 15 ..., the elastic elastic effective length Lo of the elastic elastic member 15 arranged on the outermost side is larger than the elastic force effective length Li of the elastic elastic member 15 arranged on the innermost side. It is formed to be longer (Li <Lo), and the effective elastic lengths of the elastic elastic members 15 and 15 arranged in the middle thereof gradually change.

As described above, since the elastic elastic member 15 arranged on the outer side in the width direction is longer than the elastic elastic member 15 arranged on the inner side in the width direction, the effective length of the elastic force is made longer in the width direction of the loop-shaped three-dimensional gather 10. On the outer side, the elastic force of the elastic elastic member 15 acts on a longer section, making it easier for the loop-shaped three-dimensional gather 10 to bulge and deform outward in the width direction, and the front end fixing portions 11 and the rear ends at both ends. The front non-stretchable portion 13 and the rear non-stretchable portion 14 in which the development of the elastic force of the elastic elastic member 15 ... Are suppressed, respectively, move freely between the portion fixing portion 12 and the gather sheet 7 without being fixed. Since it is provided in a state where it can be formed, the loop-shaped three-dimensional gather 10 in the center can move relatively freely in a state where it is not easily affected by the restraint of the end fixing portions 11 and 12. As a result, as shown in FIGS. 1 and 2, the loop-shaped three-dimensional gather 10 is likely to bulge and deform outward in the width direction, and even if leg pressure is applied from the outside in the width direction at the time of mounting, the loop-shaped three-dimensional gather 10 Can be prevented from falling inward in the width direction, and leakage of body fluid can be prevented.

The elastic elastic members 15 ... Arranged in the loop-shaped three-dimensional gathers 10 are preferably arranged at substantially equal intervals along the width direction, but even if the arrangement intervals are different in order to adjust the elastic force acting on the three-dimensional gathers. Good. The distance between the adjacent elastic elastic members 15 and 15 is preferably 10 to 50 mm, preferably 10 to 20 mm. The elastic elastic member 15 ... may have a substantially constant elastic force with a constant elongation rate, thickness, arrangement interval, etc., or may be formed so that the elastic force on the outer side in the width direction is larger than the elastic force on the inner side in the width direction. You may. The elastic force can be increased by increasing the elongation rate of the elastic elastic member 15, increasing the thickness, narrowing the arrangement interval, or a combination of two or more.

It is preferable that at least the front end edge of the elastic elastic member 15 ... Is located on the front side of the elastic stretchable member 15 ... That is, the front edge of the loop-shaped three-dimensional gather 10 has a shape in which a line formed by connecting the ends of adjacent elastic elastic members 15 gradually inclines outward toward the front side. preferable. On the other hand, the rear edge of the elastic elastic member 15 ... may have a line formed by connecting the ends of adjacent elastic elastic members 15 so as to be substantially parallel to each other in the width direction. The shape may be gradually inclined outward as it goes to.

In the loop-shaped three-dimensional gather 10, the ratio Li / Lo of the effective elastic length Li of the elastic elastic member 15 arranged on the innermost side in the width direction and the effective elastic length Lo of the elastic elastic member 15 arranged on the outermost side. Is preferably 0.2 to 0.8, preferably 0.4 to 0.6, from the viewpoint of appropriately bulging and deforming the loop-shaped three-dimensional gather 10 outward in the width direction.

Further, at least in the front non-stretchable portion 13, the non-stretchable length, which is the length along the napkin longitudinal direction of the front non-stretchable portion 13, is the non-stretchable length inside the width direction from the non-stretchable length Mo on the outside in the width direction. It is preferable that Mi is longer (Mo <Mi). In the embodiment shown in FIG. 1, both the front non-stretchable portion 13 and the rear non-stretchable portion 14 have the above-mentioned non-stretchable length Mo <Mi relationship, but as shown in FIG. 9, If at least the front non-stretchable portion 13 has the above-mentioned non-stretchable length Mo <Mi relationship, the rear non-stretchable portion 14 has the non-stretchable length Mo on the outer side in the width direction and the non-stretchable length on the inner side in the width direction. Mi may be formed substantially the same. By forming at least the front non-stretchable portion 13 in the relationship of the non-stretchable length Mo <Mi described above, deformation that bulges outward is likely to occur in the front side portion of the loop-shaped three-dimensional gather 10, and when the amount of body fluid discharged is large. Leakage in the front part, which tends to occur in the front part, can be prevented more reliably.

As shown in FIG. 1, the edge of the front end fixing portion 11 and the rear end fixing portion 12 on the central side in the longitudinal direction can be formed by a straight line substantially parallel to the width direction. That is, the edge of the third joint portion 27 on the central side in the longitudinal direction is formed by a straight line substantially parallel to the width direction. In this way, by forming the edge of the end fixing portions 11 and 12 on the central side in the longitudinal direction with a straight line substantially parallel to the width direction, the third joint portion 27 can be easily arranged and the manufacturing becomes easy. In this embodiment, at least the front end portion of the elastic stretchable member 15 ... Arranged in the loop-shaped three-dimensional gather 10 is formed in an inclined shape, so that at least the non-stretchable length of the front non-stretchable portion 13 is set in the width direction from the outside in the width direction. It can be formed so that the inner side is longer.

Further, as shown in FIG. 10, the edges of the front end fixing portion 11 and the rear end fixing portion 12 on the central side in the longitudinal direction are inclined so as to be inclined toward the outside in the width direction toward the center in the longitudinal direction. It may be formed. That is, the edge on the central side in the longitudinal direction of the third joint portion 27 may be formed in an inclined shape. As a result, even if the edge of the loop-shaped three-dimensional gather 10 is not formed in an inclined shape, the non-stretchable length of the non-stretchable portions 13 and 14 can be made longer on the inner side in the width direction than on the outer side in the width direction (Mo <. Mi), the degree of restraint in the non-expandable portions 13 and 14 is low on the inner side in the width direction, and the degree of freedom of deformation of the loop-shaped three-dimensional gather 10 can be increased.

As shown in FIG. 11, among the elastic elastic members 15 arranged in the loop-shaped three-dimensional gather 10, the elastic elastic member 15 arranged on the innermost side in the width direction has a front end from the front end edge of the wing-shaped flap W. It is preferable that the elastic elastic member 15 is located on the front side and the rear end is located on the rear side of the rear end edge of the wing-shaped flap W. preferably located forward of the maximum protrusion in the width direction of the maximum protrusion portion W _B of the direction. As a result, in the region corresponding to the body fluid discharge portion H of the wearer, the loop-shaped three-dimensional gather 10 is likely to be deformed to bulge outward in the width direction, and the fit in the buttocks is improved. The front end edge and the rear end edge of the wing-shaped flap W are portions where the base end portion of the wing-shaped flap W starts to protrude outward in the width direction, and are left and right of the base end portion of the wing-shaped flap W. This is the part where the separation width of the outline is the minimum. The maximum protrusion in the width direction of the hip hold flaps W _B is the side after the wing-shaped flaps W, separation width of the left and right outline is part maximized. The separation width Sa between the front end of the elastic stretchable member 15 on the inner side in the width direction and the front end edge of the wing-shaped flap W is preferably 0 to 30 mm, and the rear end of the elastic stretchable member 15 on the inner side in the width direction and the wing-shaped flap. The separation width Sb from the rear edge of W is preferably 0 to 30 mm. Further, separation width Sc of the maximum protrusion of the rear end in the width direction of the hip hold flaps W _B in the width direction outer resilient and elastic members 15 is preferably in the 0～120Mm.

In the morphological example shown in FIG. 1, the lengths of the front non-stretchable portion 13 and the rear non-stretchable portion 14 in the longitudinal direction of the napkin were formed to be substantially the same, but as shown in FIG. 11, the rear non-stretchable portion 14 is formed. The portion 14 may be formed to be relatively long. In Figure 11, only loop three-dimensional gathers 10 are slightly elongated in the front and rear thereof with a region corresponding to the body fluid discharge portion H of the wearer, the rear non-it from the majority of the rear hip hold flaps W _B The expansion / contraction portion 14 is arranged. As a result, the folded portion on the inner side in the width direction of the gather sheet 7 that does not stand up on the skin side fits on the buttocks of the wearer, and the loop-shaped three-dimensional gather 10 that protrudes toward the skin in the area corresponding to the body fluid discharge portion H is formed. Since the fit is achieved, lateral leakage at the body fluid discharge portion H can be prevented, and the fit to the buttocks is improved.

1 ... Sanitary napkin, 2 ... Impermeable back sheet, 3 ... Liquid permeable front sheet, 4 ... Absorber, 5 ... Encapsulation sheet, 6 ... Middle and high part, 7 ... Gather sheet, 10 ... Loop-shaped three-dimensional gather , 11 ... Front end fixing portion, 12 ... Rear end fixing portion, 13 ... Front non-expandable portion, 14 ... Rear non-expandable portion, 15 ... Elastic elastic member 20 ... 1st folded portion, 21 ... 2nd folded portion Part, 22 ... 1st sheet part, 23 ... 2nd sheet part, 24 ... 3rd sheet part, 25 ... 1st adhesive part, 26 ... 2nd adhesive part, 27 ... 3rd adhesive part, 28 ... 4th adhesive part

Claims (6)

The inner side portion in the width direction is folded in the width direction on both sides in the longitudinal direction on the skin contact surface side, and a plurality of elastic elastic members are arranged along the longitudinal direction and at intervals in the width direction in this folded portion. As a result, a sheet member forming a hollow loop-shaped three-dimensional gather protruding toward the skin side of the wearer is arranged in the longitudinal section including the region corresponding to the body fluid discharge portion of the wearer.
The elastic elastic member is fixed to the seat member at the front end portion and the rear end portion of the seat member, respectively, and an end fixing portion in which the folded portion of the seat member is fixed to the absorber side is formed. The loop-shaped three-dimensional gather is formed in the intermediate portion in the longitudinal direction of the seat member, and the elastic stretchable member is fixed to the seat member between the end fixing portion and the loop-shaped three-dimensional gather, respectively. Is formed,
In the loop-shaped three-dimensional gather, the effective elastic length at which the elastic elastic member expresses elastic force is longer in the elastic elastic member arranged outside in the width direction than in the elastic elastic member arranged inside in the width direction. An absorbent article characterized by being The absorption according to claim 1, wherein at least the non-stretchable portion on the front side has a non-stretchable length which is a length along the length direction of the absorbent article of the non-stretchable portion in the inner side in the width direction rather than the outer side in the width direction. Sex goods. The absorbent article according to any one of claims 1 and 2, wherein the edge on the central side in the longitudinal direction of the end fixing portion is formed by a straight line substantially parallel to the width direction. The absorbent article according to any one of claims 1 and 2, wherein the edge on the central side in the longitudinal direction of the end fixing portion is inclined toward the central side in the longitudinal direction toward the outside in the width direction. In the loop-shaped three-dimensional gather, the front end edge of the elastic stretchable member is located on the front side of the elastic stretchable member arranged on the outer side in the width direction as compared with the one arranged on the inner side in the width direction, and is located on the rear side of the elastic stretchable member. The edge is arranged substantially parallel to the width direction, or the one arranged on the outside in the width direction is located on the rear side of the one arranged on the inside in the width direction, according to any one of claims 1 to 4. The absorbent article described. Wing-shaped flaps are formed on both sides so as to wrap around the crotch part of the underwear when worn, and the hips are fixed to the inner surface of the buttocks of the underwear on both sides behind this. A flap for holding is formed,
Among the elastic stretchable members arranged in the loop-shaped three-dimensional gather, the elastic stretchable member arranged on the innermost side in the width direction has a front end located on the front side of the front end edge of the wing-shaped flap and a rear end thereof. The elastic elastic member located on the rear side of the rear end edge of the wing-shaped flap and arranged on the outermost side in the width direction has the rear end on the front side of the maximum protrusion in the width direction of the hip hold flap. The absorbent article according to any one of claims 1 to 4, which is located.

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