JP2023109563A - absorbent article - Google Patents

Abstract

To provide an absorbent article which is formed with a groove that extends along a longitudinal direction on the skin side, in which deformation along a shape of the body of a wearer is facilitated and fitness is increased.SOLUTION: There is provided an absorbent article which includes: a liquid permeable top sheet; a liquid impermeable back sheet; and an absorber that is provided between the top sheet and the back sheet, which has a longitudinal direction and a lateral direction orthogonal to the longitudinal direction, which includes a central groove that is recessed from the top sheet toward the back sheet and extends along the longitudinal direction, in which a high compression part is formed in the central groove in the plan view, the high compression part includes a discontinuous first high compression part along a first virtual wavy line extending in the longitudinal direction, and a discontinuous second high compression part along a second virtual wavy line extending in the longitudinal direction intersecting the first virtual wavy line, and the first virtual wavy line and the second virtual wavy line are line-symmetric to each other with a longitudinal direction center line extending along the longitudinal direction of the absorbent article as a symmetrical line.SELECTED DRAWING: Figure 1

Description

The present invention relates to absorbent articles.

As absorbent articles such as incontinence pads, sanitary napkins, and pad-type diapers, it extends along the skin side of the main body along the longitudinal direction for the purpose of quickly diffusing body fluid discharged in large amounts at once in the front-back direction. It is known that existing grooves are formed (for example, Patent Document 1).

In Patent Document 1, a highly compressed portion is formed at the bottom of the concave groove, and the highly compressed portion extends in the horizontal direction of the groove and is inclined in the longitudinal direction of the groove in a unit section that partitions the concave groove in the longitudinal direction. The first embossing is formed across the groove from one side end to the other side end, and is formed in a pattern in which the unit section is repeatedly reversed in the longitudinal direction of the groove, and the first embossment is laterally outward. A second embossment formed on the side edge on the opposite side is described.

Japanese Unexamined Patent Application Publication No. 2016-2098

In the configuration described in Patent Document 1, the grooves are reinforced by the high compression portion, and the grooves are less likely to be crushed. However, depending on the shape of the highly compressed portion, the compression strength at the time of formation, etc., the portion of the absorbent body where the highly compressed portion is provided may become excessively hard, preventing natural deformation of the absorbent body. Absorbent articles are usually used by being curved in the longitudinal direction so as to follow the roundness of the wearer's body in the front-rear direction. Sufficient fit may not be obtained.

In view of the above points, one aspect of the present invention provides an absorbent article in which grooves extending in the longitudinal direction are formed on the skin side, and which facilitates deformation along the shape of the wearer's body to provide a comfortable fit. The goal is to improve the quality of

A first aspect of the present invention comprises a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorbent body provided between the topsheet and the backsheet, and and a lateral direction orthogonal to the longitudinal direction, the absorbent article comprising a longitudinally extending central groove recessed from the topsheet toward the backsheet, wherein A high compression portion is formed, and the high compression portion includes a discontinuous first high compression portion along the first imaginary wavy line extending in the longitudinal direction and a discontinuous first high compression portion extending in the longitudinal direction intersecting the first imaginary wavy line. a discontinuous second pressurized portion along a second imaginary wavy line, wherein the first imaginary wavy line and the second imaginary wavy line are longitudinally centered along the longitudinal direction of the absorbent article; It has line symmetry with the line as the line of symmetry.

In the first aspect, the highly compressed portion that reinforces the groove includes the first highly compressed portion along the first imaginary wavy line extending in the longitudinal direction, and the first highly compressed portion extending in the longitudinal direction intersecting the first imaginary wavy line. and a second high compression section along two phantom dashed lines. In this way, since the high compression portion is formed along the imaginary wavy line extending in the longitudinal direction, when the center groove receives force from both sides in the lateral direction, the force is transferred along the imaginary wavy line. It becomes easier to propagate in the longitudinal direction, and the central groove 11 is less likely to collapse.

In addition, since both the first highly compressed portion and the second highly compressed portion are formed discontinuously along the longitudinal direction, it is possible to prevent the portion within the region of the central groove from becoming excessively hard continuously in the longitudinal direction. can be prevented. Therefore, the absorbent article can be easily bent in the longitudinal direction, and the absorbent article can be naturally bent along the shape of the wearer's body in the front-rear direction (the shape extending from the vicinity of the pubic bone through the crotch to the buttocks). can be done. That is, it is possible to improve the fit of the absorbent article to the body while maintaining the effect of preventing the central groove from collapsing in the lateral direction.

Furthermore, the first imaginary wavy line along which the first highly compressed portion is formed and the second imaginary wavy line along which the second highly compressed portion is formed are symmetrical about the longitudinal center line. formed. Therefore, the arrangement of the highly compressed parts or the overall shape of the highly compressed parts is line symmetrical between the first and second highly compressed parts, and the force of the legs is applied from both sides in the horizontal direction of the absorbent article. In this case, the stress distribution in the longitudinal direction generated in the highly compressed portion can be made approximately symmetrical on both sides in the lateral direction, and distortion of the groove can be prevented.

In a second aspect of the invention, the first press section is formed from a plurality of longitudinally spaced first press section sections, and the second press section comprises a plurality of longitudinally spaced press sections. between the intersections of the first virtual wavy line and the second phantom wavy line which are adjacent to each other, the first high compression section and the second high compression section are each 2 to 5 are arranged.

According to the second aspect, the number of discontinuous portions of the first high-compression portion and the number of discontinuous portions of the second high-compression portion are appropriately set along the longitudinal direction to increase the number of grooved portions. It can be smoothly curved in the longitudinal direction, and the fit of the absorbent article to the body can be improved.

In a third aspect of the present invention, no high compression section is arranged at the intersection.

According to the third aspect, it is possible to avoid the formation of excessively hard portions in the grooves by avoiding the high-pressing portions from being densely packed.

In a fourth aspect of the invention, at least the edges of said first press section have laterally parallel sides perpendicular to said longitudinal direction.

In the fourth aspect, since the edges of the highly compressed section are parallel in the horizontal direction, the orientation of the highly compressed section itself is less likely to change even if force is applied to the central groove from the outside in the horizontal direction. Therefore, it is possible to reduce the possibility that the region (low compression portion) between the high compression portion sections is twisted or distorted. As a result, the distortion of the central groove as a whole can be prevented, and the effect of making the central groove less likely to collapse can be improved.

In the fifth aspect of the present invention, one end edge of the first high compression section and one end edge of the second high compression section, which are arranged in the horizontal direction, are positioned on a common straight line along the horizontal direction. are doing.

According to the fifth aspect, the positions of the edges of the high-pressing section sections of the first high-pressing section and the second high-pressing section are aligned when viewed in the longitudinal direction. That is, the positions of the discontinuous portions without the high-pressing section are uniform when viewed in the longitudinal direction. As a result, it becomes easy to form a base axis for bending along the lateral direction for bending the absorbent article in the longitudinal direction, and bending in the longitudinal direction is facilitated, so that the absorbent article can be fitted to the body even more. can improve.

In a sixth aspect of the present invention, the position of the first high press section and the position of the second high press section are offset when viewed in the longitudinal direction.

According to the sixth aspect, when forming the highly compressed portions along the longitudinal direction during manufacturing of the absorbent article, the pressing force for compression is applied to the first highly compressed portion section and the second highly compressed portion section. It becomes difficult to disperse in the horizontal direction. Therefore, the first high-compression section of the first high-compression section and the second high-compression section of the second high-compression section can be reliably formed without applying high pressure.

In a seventh aspect of the present invention, a pair of grooves extending outward in the longitudinal direction from at least one end of the central groove in the longitudinal direction and formed such that the distance between each other increases as the distance from the central groove increases. Further comprising diagonal grooves, discontinuous high compressions are formed within the pair of diagonal grooves.

According to the seventh aspect, the central groove and the pair of oblique grooves can form a Y shape. With this Y-shaped groove as a base axis, the absorbent article can be easily deformed, and three-dimensional deformation along the shape of the wearer's body is possible. For example, the central groove is recessed on the non-skin side, both sides of the central groove are in close contact with the body, and the area in front of the central groove is in close contact with the front surface of the body, or the area behind the central groove is in contact with the body. can be brought into close contact with the rear surface of the As a result, even when a large amount of body fluid is discharged at once, leakage to the outside in the longitudinal direction and the lateral direction can be prevented.

According to one aspect of the present invention, an absorbent article having grooves extending in the longitudinal direction formed on the skin side can be easily deformed along the shape of the wearer's body to improve fit. can.

1 is a plan view of an absorbent article according to one embodiment; FIG. FIG. 2 is a sectional view taken along line II of FIG. 1; FIG. 2 is a partially enlarged view of the central groove shown in FIG. 1; 4 is an enlarged view of portion II of FIG. 3; FIG. 4 shows a modification of the high compression section. It is a figure explaining an example of the preferable shape of a high pressing part division. It is a figure explaining an example of the shape of the high compression part division corresponding to FIG. FIG. 4 is a plan view of an absorbent article according to a second embodiment; FIG. 9 is a partially enlarged view of the central groove shown in FIG. 8;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in each drawing, unless otherwise described, the same reference numerals may be attached to the same or corresponding configurations, and the description thereof may be omitted.

[First embodiment]
<Basic Structure of Absorbent Article>
FIG. 1 shows a plan view of an absorbent article 1 according to the first embodiment. 2 shows a cross-sectional view taken along the line II of FIG. As shown in FIGS. 1 and 2, an absorbent article 1 includes a liquid-permeable top sheet 3, a liquid-impermeable back sheet 2, and an absorbent body 4 disposed between the two sheets. Therefore, it has a generally flat shape as a whole before being worn (Fig. 2). When the absorbent article 1 is worn, the top sheet 3 side is the side that touches the skin (skin side or front side), and the back sheet 2 side is the side that is fixed to the underwear (underwear side or back side). FIG. 1 is a view of the absorbent article 1 viewed from the skin side.

The absorbent article 1 has an elongated shape in plan view, and has a longitudinal direction (front-rear direction) D1 and a lateral direction (width direction or left-right direction) D2 orthogonal to the longitudinal direction D1. When the absorbent article 1 is worn, the longitudinal direction D1 corresponds to the front-back direction of the wearer's body, and the lateral direction D2 corresponds to the left-right direction of the wearer's body. In the form shown in FIG. 1, the absorbent article 1 has a center line (the center line that bisects the absorbent article 1 in the lateral direction D2, or the longitudinal center line) CL extending along the longitudinal direction D1 in plan view. Although it has a substantially line-symmetrical shape, the shape does not have to be line-symmetrical. In addition, the configuration other than the shape of the absorbent article 1 (including the density, material, and size of the compressed portion of the absorbent body 4, etc.) may be substantially symmetrical with respect to the center line CL as an axis of symmetry, or may be asymmetrical. may be

The back sheet 2 may be a sheet having at least water impermeability, and may be, for example, a sheet made of an olefin resin such as polyethylene or polypropylene. In addition, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, or a laminated sheet of a nonwoven fabric in which a waterproof film is interposed to substantially ensure liquid impermeability can be used. Moreover, from the viewpoint of preventing stuffiness, it is more desirable to use a material having moisture permeability. Such water-impermeable/moisture-permeable sheet materials are produced by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet in a uniaxial or biaxial direction. A porous sheet or the like can be used.

The top sheet 3 can be a sheet permeable to body fluids such as urine, menstrual blood, and vaginal discharge. As the top sheet 3, a perforated or non-perforated nonwoven fabric, a porous plastic sheet, or the like is preferably used. The material fibers that make up the nonwoven fabric include, for example, olefins such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, regenerated fibers such as rayon and cupra, blended fibers thereof, and natural fibers such as cotton. It can be used in combination of two or more. Examples of nonwoven fabric processing methods include spunlace, spunbond, thermal bond, meltblown, needle punch, and the like. Among these processing methods, the spunlace method is preferable because it can produce a soft nonwoven fabric, the spunbond method is preferable because it can produce a nonwoven fabric with excellent drapeability, and the thermal bonding method is preferable because it can produce a bulky and soft nonwoven fabric. In addition, composite fibers such as core-sheath type fibers, side-by-side type fibers, split type fibers, etc., in which a fiber having a high melting point is used as a core and a fiber having a low melting point is used as a sheath, can also be used.

Absorbent body 4 is not limited as long as it is a material that can absorb and retain bodily fluids, but preferably contains cotton-like pulp and a water-absorbent polymer. As the absorbent polymer, superabsorbent polymer (SAP), superabsorbent fiber (SAF), and combinations thereof can be used. The pulp includes chemical pulp obtained from wood, cellulose fibers such as dissolving pulp, and artificial cellulose fibers such as rayon and acetate. Broad-leaved trees, softwoods, and the like are used as raw materials for chemical pulp, and softwoods are preferably used because of their long fiber length.

The absorbent body 4 may be mixed with synthetic fibers. As synthetic fibers, polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof can be used, and two of these can be used in combination. can also In addition, composite fibers such as core-sheath type fibers, side-by-side type fibers, and split type fibers having a high melting point fiber as a core and a low melting point fiber as a sheath can also be used. It is also possible to use hydrophobic fibers surface-treated with a hydrophilizing agent to impart affinity to body fluids. The absorber 4 is preferably manufactured by a piling or airlaid method.

The absorbent body 4 may be obtained by wrapping the body portion of the absorbent body 4 with an enveloping sheet made of crepe paper, nonwoven fabric, or the like. Since the absorbent body 4 is provided with the wrapping sheet, the absorbent body 4 can be prevented from being twisted or cracked, and can retain its shape. As the enveloping sheet, non-colored (that is, white) crepe paper or non-woven fabric can be used, or a colored one (for example, colored similar to or complementary to the color of the body fluid) can be used. can.

The absorber 4 may have an elongated shape having a substantially constant width in plan view as shown in FIG. 1, but the width of the absorber 4 may vary along the longitudinal direction D1. The absorber 4 as a whole may have a uniform thickness over the entire surface, but the thickness of the absorber 4 may not be uniform and may be locally thin or thick.

At both edges in the longitudinal direction D1 of the absorbent body 4, the edges of the back sheet 2 and the edges of the top sheet 3 may be joined by an adhesive, heat sealing, or the like (shown hatched in FIG. 1). . A pair of side sheets 7, 7 may be arranged on both sides of the absorbent article 1, that is, on both sides in the lateral direction D2, on the front side (the side of the top sheet 3) along the longitudinal direction D1.

The side sheet 7 may be made of a nonwoven fabric material that has undergone an appropriate water-repellent treatment or hydrophilic treatment, depending on the purpose of preventing permeation of bodily fluids or improving the feel of the skin. The material of the side sheet 7 may be natural fiber, synthetic fiber, regenerated fiber, or the like. In addition, when the side sheet 7 is subjected to a water repellent treatment, a water repellent such as silicone or paraffin can be used for the treatment. The absorbent article has a structure in which the top sheet 3 extends to the end of the absorbent article 1 in the lateral direction D2 and is joined to the back sheet 2 without using the side sheet 7. good too. In addition, the side sheets 7 are formed into two layers by folding back or additionally overlapping separate side sheets on each side, and a stretchable member such as a rubber thread is stretched in a stretched state along the longitudinal direction between the two layers. The riser gathers may be formed by being positioned and intermittently secured. Then, for example, the gathered sheet 7 is fixed at the inner end or the outer end in the width direction D2, so that the rising gathers on both sides can be set at the outer end in the width direction D2 or The inner edge can rise to the skin side.

The absorbent article 1 includes an intermediate region M that mainly corresponds to the wearer's crotch when worn, a front region F that is adjacent to the intermediate region M in front and extends to the front end of the absorbent article 1, and an intermediate region. It has a rear region R that is adjacent to the rear of the region M and extends to the front end of the absorbent article 1 . The intermediate region M includes a bodily fluid outlet facing region Q. As shown in FIG. The bodily fluid outlet facing region Q is a region that faces the bodily fluid outlet such as the urethral orifice, the vaginal opening, etc. of the wearer when worn, and its center is on the longitudinal center line CL. In the example shown in FIG. 1, the body fluid outlet facing region Q is drawn in an elliptical shape as a region corresponding to the urethral meatus, but the size and shape of the body fluid outlet facing region Q shown in the figure are the same as the body fluid outlet facing region Q of this embodiment. It is merely an example for explaining the physical product.

The front region F and the rear region R can be folded back toward the skin in the longitudinal direction D1 when the absorbent article is packaged individually. In the example of FIG. 1, the front region F is folded at the folding line along the boundary between the front region F and the intermediate region M, and the rear region R is folded at the boundary between the rear region R and the intermediate region M. It can be done with a fold line along the line. Either the front region F or the rear region R may be folded first. Such folding allows the absorbent article 1 to be folded into three or more.

The length (total length) in the longitudinal direction D1 of the absorbent article 1 is preferably 170 to 360 mm, more preferably 200 to 270 mm. The length of the absorbent article 1 in the lateral direction D2 (the width of the main body excluding the wing portions if wings are provided) may preferably be 50-150 mm, more preferably 70-120 mm. Moreover, the width of the absorbent body 4 sandwiched between the top sheet 3 and the back sheet 2 may be 50 to 100 mm. Furthermore, the overall thickness of the absorbent article 1 may preferably be 1-30 mm, more preferably 2-15 mm.

Although the absorbent article 1 shown in FIGS. 1 and 2 does not have wings, the absorbent article 1 may have a pair of wings extending laterally from both side edges of the intermediate region M, respectively. A wing can be formed by joining the extending portion of the side seat 7 and the extending portion of the back seat 2 .

In addition, on the side of the back sheet 2 of the absorbent article 1, an anti-slip portion may be formed to prevent the absorbent article 1 from slipping by securely fixing the absorbent article 1 to the underwear when worn ( not shown). Preferably, the anti-slip portion is an adhesive anti-slip portion. The adhesive anti-slip portion is formed, for example, by applying a fluid adhesive or by attaching a pre-formed adhesive layer (adhesive tape or the like). A known adhesive such as a hot-melt adhesive can be used as the adhesive used as the anti-slip portion. Its main ingredients include styrenic polymers, tackifiers, and plasticizers, and combinations thereof.

The skin side of the absorbent article 1 is provided with grooves recessed from the skin side to the non-skin side (that is, recessed from the top sheet 3 toward the back sheet 2). In the example shown in FIG. 1, the grooves are a central groove 11, a pair of oblique grooves 12Lf and 12Rf formed in front of the central groove 11, and a pair of oblique grooves 12Lr and 12Rr formed behind the central groove 11. However, the absorbent article 1 according to one embodiment may be an absorbent article omitting the oblique grooves 12Lf, 12Rf, 12Lr, and 12Rr.

The grooves are preferably pressed grooves formed by pressing. The pressed grooves can be formed by passing a laminate in which at least the absorbent body 4 and the top sheet 3 are superimposed, through a pair of pressure rolls. For example, a roll having a convex surface corresponding to the desired shape of the compressed grooves and a roll having a flat surface opposed to the roll are prepared, and the roll having the convex portion is arranged on the top sheet 3 side. , the laminate comprising the absorbent body 4 and the topsheet 3 can be passed between rolls. A region in which no compressed groove is formed is shown as a non-compressed portion 14 .

<Central groove>
The central groove 11 is a groove formed in the center of the absorbent article 1 in the lateral direction D2 along the longitudinal direction D1. Since the central groove 11 is a groove that is recessed from the side of the top sheet 3 to the side of the back sheet 2, when the absorbent article 1 receives force from both sides in the horizontal direction D2 when worn, the central portion in the horizontal direction D2 is bent. is likely to deform so as to protrude toward the back sheet 2 side (non-skin side). Bodily fluids can be retained at least temporarily in depressions on the skin side formed by the protrusions. Also, when the central groove 11 is formed by squeezing, the area of the central groove 11 has a higher density than the non-squeezed area around the central groove 11, so that body fluids can flow into the central groove 11. be easily retained.

Since the central groove 11 extends along the longitudinal direction D1, it not only receives and temporarily retains body fluid as described above, but also has the function of guiding the body fluid in the longitudinal direction D1. Especially when the central groove 11 is formed by compression, the density of the region where the central groove 11 is formed is higher than the density of the non-compressed regions on both sides in the lateral direction D2. is easier to guide in the longitudinal direction D1 than in the lateral direction D2. By guiding the body fluid over the longitudinal direction D1, leakage of the body fluid in the lateral direction D2 can be prevented.

In addition, the central groove 11 is formed so as to overlap the bodily fluid outlet facing region Q at the center in the lateral direction D2, preferably so as to overlap the longitudinal center line CL of the absorbent article 1 . In the illustrated example, the center line extending along the longitudinal direction D1 of the central groove 11 (the line passing through the center of the width of the central groove 11) coincides with the longitudinal center line CL of the absorbent article 1. FIG.

The central groove 11 is preferably formed so as to include the intermediate region M of the absorbent article 1, and more preferably so as to include the bodily fluid outlet facing region Q in the longitudinal direction D1. Moreover, it is preferable that the central groove 11 is formed in the intermediate region M. As shown in FIG. This makes it easier to fit the front region F and the rear region R of the absorbent article 1 along the roundness of the front and rear surfaces of the body.

The length of the central groove 11 in the longitudinal direction D1 is preferably 50-160 mm, more preferably 55-80 mm. By setting the length in the above range, the body fluid can be sufficiently guided in the longitudinal direction D1, and the formation of grooves near the center of the front region F and the rear region R in the width direction D2 can be avoided. It becomes easier to fit the rear region R to the front and rear surfaces of the wearer's body.

The length (width) of the central groove 11 in the lateral direction D2 is preferably 3 to 15 mm, more preferably 4 to 8 mm. By setting the length (width) within the above range, even a large amount of body fluid can be easily stored in the central groove 11, and even if the central groove 11 is slightly deformed due to strong force applied from both sides in the lateral direction D2, the central groove 11 can be The shape and function of the groove 11 as a groove can be maintained.

<High compression part>
In this embodiment, as shown in FIG. 1, a high compression portion 20 is formed inside the central groove 11 . The highly compressed portion 20 is a portion that is compressed deeper than the bottom surface of the central groove 11 . The high compression portion 20 herein is shown in black in the drawings. However, in the cross-sectional view of FIG. 2, illustration of the high compression portion 20 is omitted. When the central groove 11 itself is formed by compression, the central groove 11 will have a high compression portion 20 and a low compression portion other than the high compression portion 20 . In the illustrated example, the portions other than the high compression portion 20 in the central groove 11 are low compression portions. In addition, the low compression portion is 1 to 10 mm, preferably 2 to 5 mm, than the surrounding area without compression (the area of the body other than the central groove 11 and the oblique grooves 12Lf, 12Rf, 12Lr, and 12Rr in the illustrated example). A recessed portion, the high compression portion 20 may be a portion that is compressed 0.2 to 1 mm deeper than the low compression portion in the central groove 11 .

Forming the highly compressed portion 20 in the central groove 11 increases the rigidity of the bottom of the central groove 11 and, in some cases, the sides thereof, so that even if the legs receive force from both sides when worn, It is possible to prevent the central groove 11 from collapsing, that is, from reducing the width of the central groove 11 or from closing in some cases. In addition, since the highly compressed portions 20 are not formed in the entire area of the central groove 11 but are dispersed partially within the area of the central groove 11, the bottom of the central groove 11 is prevented from becoming excessively hard. and the flexibility of the absorbent article 1 can be ensured.

As shown in FIG. 1, the high compression portion 20 includes a discontinuous first high compression portion 21 along a first imaginary broken line WL1 extending in the longitudinal direction D1, and a discontinuous first compressed portion 21 along a second imaginary broken line WL2. and a second high compression portion 22 . FIG. 3 shows a partially enlarged view of the high compression portion 20 of FIG. 4 shows an enlarged view of portion II of FIG.

As shown in FIGS. 3 and 4, the high compression portions 20 (first high compression portion 21 and second high compression portion 22) are formed along imaginary wavy lines (first imaginary wavy line WL1 and second imaginary wavy line WL2). Therefore, the force that the central groove 11 receives from both sides in the lateral direction D2 during mounting is easily propagated in the longitudinal direction D1 along the imaginary broken line within the central groove 11 . Therefore, even if force is locally applied to the central groove 11 in the longitudinal direction D1, the force can be dispersed in the longitudinal direction D1, and the central groove 11 is less likely to collapse.

Both of the virtual wavy lines (the first virtual wavy line WL1 and the second virtual wavy line WL2) have a shape having a radius of curvature at the end in the width direction D2. The shape at the position has a rounded shape. As a result, even if a strong force is applied from the legs, excessive concentration of stress on a predetermined portion can be suppressed, and the top sheet 3 can be prevented from twisting or tearing.

Furthermore, as shown in FIGS. 3 and 4, both the first highly compressed portion 21 along the first imaginary wavy line WL1 and the second highly compressed portion 22 along the second imaginary wavy line WL2 are discontinuous. there is More specifically, the first high compression portion 21 includes a plurality of first high compression portion sections 31A, 31B, 31C, 31D, . It includes a plurality of second press sections 32A, 32B, 32C, 32D, . . . spaced apart D1 (FIG. 4). In the first high compression section 21, portions (discontinuous portions) 41, 41, ... between the first high compression sections 31A, 31B, 31C, 31D, ... are low compression sections, and the second high compression section. 22, portions (discontinuous portions) 42, 42, . . . between the second high compression section sections 32A, 32B, 32C, 32D, .

By forming both the first highly compressed portion 21 and the second highly compressed portion 22 discontinuously in this way, it is possible to prevent the bottom of the central groove 11 from continuing in the longitudinal direction D1 and becoming excessively hard. As a result, the absorbent article 1 can be easily bent in the longitudinal direction D1, and the absorbent article 1 can be applied along the front-rear direction of the wearer's body, for example, from the vicinity of the pubic bone through the crotch to the buttocks when worn. At this time, it can be brought into close contact along the roundness along the front-rear direction of the body. Therefore, according to the structure of the highly compressed portion of this embodiment, the central groove 11 is less likely to be crushed, and the fit in the front-rear direction of the body when the absorbent article 1 is worn can be improved.

The first imaginary wavy line WL1 and the second imaginary wavy line WL2 may each have a random wavy shape or a regular wavy shape. If there is, the highly compressed portions formed along the imaginary wavy lines can also be formed in a regular pattern, whereby the easiness of bending of the central groove 11 in the longitudinal direction D1 becomes uniform along the longitudinal direction D1, which is preferable. Also, the first virtual wavy line WL1 and the second phantom wavy line WL2 preferably have a constant amplitude and a constant wavelength over the length of the central groove 11, respectively. The first virtual wavy line WL1 and the second phantom wavy line WL2 may have the same amplitude and/or wavelength, or may have different amplitudes and/or wavelengths. In FIG. 3, the first virtual wavy line WL1 and the second phantom wavy line WL2 have the same wavelength (or the pitch of the unevenness) and are represented by P. As shown in FIG. P may be between 15 and 35 mm.

Furthermore, as shown in FIG. 3, a first imaginary wavy line WL1 along which the first highly compressed portion 21 is formed and a second imaginary wavy line WL2 along which the second highly compressed portion 22 is formed are They are formed line-symmetrically with the longitudinal center line CL as the line of symmetry. Therefore, the first high-compression part 21 and the second high-compression part 22 can also be line-symmetrical as a whole shape. Therefore, when the leg force is applied from both sides of the absorbent article 1 in the lateral direction D2, the stress distribution in the longitudinal direction D1 generated in the high compression portion 20 is approximately symmetrical on the left and right. Distortion can be avoided. In the example shown in FIG. 3, the first virtual wavy line WL1 and the second phantom wavy line WL2 have the same amplitude and wavelength, and have shapes formed with a phase shift of 180°.

As shown in FIGS. 3 and 4, there are a plurality of intersections IP, IP, . And the high compression part 20 is not arrange|positioned in intersection IP, IP,.... As a result, it is possible to prevent the bottom of the central groove 11 from becoming excessively hard due to the densely compressed portions 20 .

Furthermore, the number of the first high compression section segments included in the range in the longitudinal direction D1 between the adjacent intersection points IP, IP may be plural, and is preferably 2 to 5. Similarly, the number of second high compression section segments included in the range in the longitudinal direction D1 between the adjacent intersections IP, IP may be plural, preferably 2 to 5. As a result, the number of discontinuous portions 41, 41, . . . and 42, 42, . You can prevent damage.

The area of one high-pressing section (first high-pressing section 31A, 31B, . . . and second high-pressing section 32A, 32B, . . . ) may be 1.0 to 2.2 mm ² . As a result, it is possible to obtain a configuration that does not hinder the bending of the absorbent article 1 in the longitudinal direction D1 while maintaining the function of the highly compressed portion that reinforces the central groove 11 .

The shape of the high compression portion 20 (the first high compression portion 21 and the second high compression portion 22) included in the range from one intersection IP to the two adjacent intersection IPs is the intersection IP between the two intersections IP. It may be formed point-symmetrically as a point of symmetry. In addition, the shape of the highly compressed portion 20 in the range between two adjacent intersections IP, IP is symmetrical about a straight line drawn parallel to the width direction D2 at the intermediate position between the intersections IP, IP. good.

As shown in FIG. 4, the first high compression portion 21 may have a shape in which a wavy strip WB (illustrated by a dotted line) having a constant width is notched along an imaginary cutting line along the horizontal direction D2. More specifically, the wavy band WB may have a shape in which the portion between the imaginary cutting lines X1 and X2 and the portion between the imaginary cutting lines X3 and X4 are removed. In this case, the first imaginary wavy line WL1 may be a center line passing through the center of the width of the corrugated strip WB. Since the first highly compressed portion 21 has a shape formed based on the corrugated band WB in this manner, the first highly compressed portion sections 31A, 31B, 31C, . . . , the relationship between the first high compression sections is maintained to some extent in the mechanical behavior. Therefore, even if a force is applied to a part of the first high compression portion 21, the force can be propagated in the longitudinal direction D1 along the corrugated strip WB.

On the other hand, the second high-pressing portion 22 has a shape such that the ends of the second high-pressing portion sections 32A, 32B, 32C, 32D, . . . you can In the example shown in FIGS. 3 and 4, the second high-pressing section is an almond-shaped or leaf-shaped portion cut by a virtual cutting line along the lateral direction D2, preferably a virtual cutting line parallel to the lateral direction D2. It has a notched shape. More specifically, it has an almond-shaped or leaf-shaped portion where both ends in the longitudinal direction D1 converge on the second imaginary wavy line WL2, with the portion between imaginary cutting lines X1 and X2 removed. In this embodiment, since the area of the second highly compressed portion 22 is smaller than the area of the first highly compressed portion 21, the total area of the highly compressed portions in the central groove 11 can be reduced. Therefore, even if high pressure is applied to form the highly compressed portion, it is possible to prevent the rigidity of the region within the central groove 11 from being excessively increased, thereby avoiding the curving of the absorbent article 1 during wearing. can. In addition, the degree of freedom of the pattern drawn by the high pressing portion is increased, and the design is also improved.

In addition, the 2nd high compression part 22 may also have a shape based on a corrugated strip like the 1st high compression part 21. FIG. FIG. 5 shows, as a modification of this embodiment, a form in which the second high-compression part 22 has the same shape as the first high-compression part 21 . In this example, the shape of the high compression section can also be made symmetrical with respect to the longitudinal center line CL, so that the groove can be prevented from being twisted or distorted when force is applied from both sides in the width direction D2. is preferable from the viewpoint of improving the

d1 (FIG. 4) of the longitudinal direction D1 between the imaginary cutting lines X1, X2 may be 1-2 mm, preferably 1.5-1.8 mm. The length d2 (FIG. 4) in the longitudinal direction D1 between the imaginary cutting lines X3 and X4 formed at positions different from the imaginary cutting lines X1 and X2 may also have the same length as the length d1. Further, by making the lengths of the portions cut out in the longitudinal direction D1 between the imaginary cutting lines, that is, the lengths of the discontinuous portions 41, 41, . . . Since a plurality of base axes for bending in the longitudinal direction D1 are reliably formed over the entire longitudinal direction D1 of the central groove 11, the absorbent article 1 can be easily and naturally bent in the longitudinal direction D1.

In addition, the length in the longitudinal direction D1 of one high-pressing section within the central groove 11 (the length from the foremost edge to the rearmost edge of the high-pressing section) may be uniform or may vary depending on the location. However, it is preferable to set it to 1.2 to 1.9 mm.

As shown in FIG. 4, the first highly compressed portion 21 and the second highly compressed portion 22 may be cut at common imaginary cutting lines, such as imaginary cutting lines X1 and X2 and imaginary cutting lines X3 and X4. . That is, the positions of the discontinuous portions 41, 41, . . . of the first high-compression portion 21 and the discontinuous portions 42, 42, . Thereby, a relatively soft low-compression portion is arranged in the central groove 11 so as to traverse the central groove 11 from end to end in the lateral direction D2. Therefore, a plurality of base axes extending across the width of the central groove 11 for bending in the longitudinal direction D1 are reliably formed, making it easier to bend in the longitudinal direction D1 along the shape of the body in the front-rear direction.

<Shape of high-pressing section>
At least in the first high-pressing portion 21, the first high-pressing portion sections 31A, 31B, 31C, 31D, . It may have parallel sides. As used herein, "parallel" includes not only strict parallelism but also directions deviating from parallel within 10°, preferably within 5°.

The above effects of the predetermined shape of the first high compression section will be explained with reference to FIGS. 6 and 7. FIG. FIG. 6 shows an enlarged view of the first high compression section 31B, 31C (FIG. 4). When a force F is applied to the central groove 11 from the outside in the lateral direction D2 while the absorbent article 1 is being worn (FIG. 6(a)), the first highly compressed portion sections 31B and 31C having high rigidity within the central groove 11 force is easily applied to However, since the edges 31Be and 31Ce of the first high compression sections 31B and 31C in the longitudinal direction D1 are along the lateral direction D2 (along the direction of the force F), even if the force F is large, The direction of the 1 high compression section 31B, 31C itself is difficult to change. Therefore, deformation is less likely to occur in the region (lower compression portion) between the first high compression section 31B and the first high compression section 31C. , 31C and the edge of the central groove 11 only contracts in the lateral direction D2 (FIG. 6(b)).

On the other hand, FIG. 7 shows the edges of the high compression section 31B' and 31C' in the longitudinal direction D1 (the edge 31Be' of the first high compression section 31B' and the edge 31Ce' of the first high compression section 31C'). ) are not parallel to the horizontal direction D2. When a force F is applied to the high compression sections 31B' and 31C' from the outside in the lateral direction D2 (FIG. 7(a)), the force F is applied to the first high compression section 31B' in the illustrated example. It is easy to hang on the protruding corners of the edge 31Be'. As such, the central groove 11 may deform such that the orientation of the first press section 31B changes. Then, the region (low compression portion) between the first high compression section 31B' and the first high compression section 31C' is distorted (FIG. 7(b)), and this distortion leads to the distortion of the central groove 11 as a whole. obtain.

Thus, by forming the shape of the edge in the longitudinal direction D1 of the highly compressed portion section along the lateral direction D2, preferably parallel to the lateral direction D2, the shape of the highly compressed portion in the central groove 11 is In addition, the effect of making the central groove 11 less likely to be crushed can be improved.

Note that the outline of the high compression portion 20 and the outline of the central groove 11 may be in contact with each other or may be separated from each other. If spaced apart, the spacing in the lateral direction D2 may be between 0.5 and 2 mm. As a result, a low-compressed portion is formed between the highly-compressed portion 20 and the uncompressed non-compressed portion 14, and the thickness from the non-compressed portion 14 to the highly-compressed portion 20 is reduced stepwise. It is possible to avoid large stress concentrations in the contour of the central groove 11 and to prevent tearing of the top sheet 3 and undesirable deformation of the absorbent body 4 .

<Diagonal groove>
In this embodiment, as shown in FIG. 1, the central groove 11 extends outward in the longitudinal direction D1 from the front end portion 11f (toward the end in the longitudinal direction D1 of the absorbent article 101), and the distance between each other is the center. A pair of oblique grooves 12Lf and 12Rf are formed so as to increase in size with increasing distance from the groove 11, extending outward in the longitudinal direction D1 from the rear end portion 11r of the central groove 11 (in the longitudinal direction D1 of the absorbent article 101). A pair of oblique grooves 12Lr and 12Rr are formed so that the distance between them increases with increasing distance from the center groove 11. As shown in FIG. In FIG. 1, a pair of oblique grooves 12Lf and 12Rf and a pair of oblique grooves 12Lr and 12Rr are formed both forward and rearward of the central groove 11, but only one pair of oblique grooves is formed. may have been As with the central groove 11, the pair of oblique grooves are preferably formed by pressing. Moreover, it is preferable that the pair of oblique grooves be symmetrical with respect to the longitudinal center line CL.

A Y-shaped groove can be formed by combining the central groove 11 and a pair of oblique grooves, so that the absorbent article 1 can be deformed around the Y-shaped groove to conform to the shape of the wearer's body. three-dimensional deformation is possible. For example, according to a Y-shaped groove that is a combination of the central groove 11 and a pair of diagonal grooves 12Lf and 12Rf on the front side, the area between the pair of diagonal grooves 12Lf and 12Rf can be positioned in front of the wearer's body. It can be fitted along the roundness of the surface (the surface near the pubic bone), and in the region corresponding to the crotch, a depression is formed along the central groove 11 toward the non-skin side to receive body fluids well. , can be diffused. Similarly, according to the Y-shaped groove that is a combination of the central groove 11 and the pair of rear oblique grooves 12Lr and 12Rr, it is possible to follow the rear surface of the wearer's body (surface near the buttocks). and the area corresponding to the crotch area can well receive and diffuse body fluids. Therefore, the fitting property of the absorbent article 1 is improved, and the effect of preventing the leakage of bodily fluids is enhanced.

The pair of oblique grooves (the pair of oblique grooves 12Lf and 12Rf and/or the pair of oblique grooves 12Lr and 12Rr) may or may not be continuous with the central groove 11. By doing so, the center groove 11 and the pair of diagonal grooves can form a more distinct Y-shape, thereby improving the above-mentioned effect of enabling three-dimensional deformation that fits the shape of the wearer's body. can be made

A pair of oblique grooves (a pair of oblique grooves 12Lf and 12Rf and/or a pair of oblique grooves 12Lr and 12Rr) may each have a high compression portion 25 (20). The highly compressed portions 25 are discontinuously formed in the extending direction of each of the oblique grooves 12Lf, 12Rf, 12Lr, and 12Rr. Since the highly compressed portions 25 are also formed in the oblique grooves 12Lf, 12Rf, 12Lr, and 12Rr, appropriate rigidity can be imparted to the oblique grooves 12Lf, 12Rf, 12Lr, and 12Rr, and each groove is reinforced. 2, even when the absorbent article 1 is deformed when worn, the oblique grooves are less likely to be crushed.

Thus, in the present embodiment, both the highly compressed portions 21 and 22 formed in the central groove 11 and the highly compressed portions 25 formed in the oblique grooves 12Lf, 12Rf, 12Lr, and 12Rr both extend in the longitudinal direction. It is discontinuous at D1. This configuration has the following advantages over the case where the highly compressed portions 21 and 22 in the central groove 11 or the highly compressed portions 25 in the diagonal grooves 12Lf, 12Rf, 12Lr, and 12Rr are continuous in the longitudinal direction D1. have For example, if either of the highly compressed portions 21 and 22 in the central groove 11 is formed continuously in the longitudinal direction D1, depending on the pressure of compression, the bottom of the central groove 11 may be excessively continuous in the longitudinal direction D1. It can be pressed firmly against In that case, if a strong force is applied from the legs or the like when worn, there is a possibility of damage at the boundary between the high compression part and the low compression part (for example, the top sheet 3 or the absorbent body 4 may be cut). To reduce stiffness, the pressure during pressing may be reduced. However, if the compression pressure is reduced, discontinuous high compression portions may not be sufficiently formed and may not function as high compression portions. In contrast, by forming both the highly compressed portions 21 and 22 in the central groove 11 and the highly compressed portions 25 in the oblique grooves 12Lf, 12Rf, 12Lr, and 12Rr discontinuously in the longitudinal direction D1, absorption It is possible to reliably form a highly compressed portion while preventing damage to the functional article 1.例文帳に追加

In addition, as shown in FIG. 1, the plan view shape of each highly compressed portion section in the highly compressed portions 25 in the oblique grooves 12Lf, 12Rf, 12Lr, and 12Rr is preferably circular or elliptical. By making the plan view shape of the highly compressed section into a shape without corners, the rigidity of the highly compressed section itself is slightly reduced, so the oblique grooves 12Lf, 12Rf, 12Lr, and 12Rr are improved in flexibility. The front region F and the rear region R in which the oblique grooves 12Lf, 12Rf, 12Lr, 12Rr are formed are more closely attached to the body than the middle region M, so the oblique grooves 12Lf, 12Rf, 12Lr, 12Rr and their The high flexibility of the surroundings improves the feeling of wearing.

Further, the plan view area of each highly compressed portion section in the highly compressed portion 25 in the oblique grooves 12Lf, 12Rf, 12Lr, and 12Rr can be the same as the interval between the highly compressed portion sections in the central groove 11 . The distance (distance along the extending direction of the oblique grooves) d3 (in FIG. It can be similar to the spacing between the squeeze section sections. This configuration contributes to reducing the difference in the depth of the highly compressed portion between the oblique grooves and the central groove in the groove forming process.

[Second embodiment]
FIG. 8 shows an absorbent article 101 according to the first embodiment. FIG. 8 is a diagram corresponding to FIG. 1, and is a plan view seen from the skin side. 9 shows a partially enlarged view of the central groove 11 in the absorbent article 101 shown in FIG.

The basic configuration of absorbent article 101 is the same as absorbent article 1 (FIG. 1). As shown in FIGS. 8 and 9, also in the present embodiment, in the central groove 11, a discontinuous first high compression portion 121 along the first imaginary broken line WL1 extending in the longitudinal direction D1, and a first A discontinuous second high compression portion 122 is formed along a second imaginary broken line WL2 extending in the longitudinal direction D1 intersecting the imaginary broken line. Therefore, it is possible to prevent the region of the central groove 11 from becoming excessively hard continuously in the longitudinal direction D1. Therefore, the absorbent article 101 can be easily bent in the longitudinal direction, and the absorbent article 101 can be naturally bent along the shape of the wearer's body in the front-rear direction. Further, as in the first embodiment, the first imaginary wavy line WL1 and the second imaginary wavy line WL2 are formed symmetrically about the longitudinal center line CL, so that the central groove 11 is less likely to collapse. there is Therefore, it is possible to improve the fit of the absorbent article to the body while maintaining the effect of preventing the central groove 11 from being crushed in the lateral direction.

This embodiment differs from the first embodiment (absorbent article 1) in that the highly compressed portion 20 formed in the groove is different. More specifically, the first high compression section sections 131A, 131B, ... included in the first high compression section 121 and the second high compression section sections 132A, 132B, ... included in the second high compression section 122 are respectively , is circular in plan view. Thus, in the embodiment of the present invention, the shape of the high compression section (the first high compression section and/or the second high compression section) is not limited to the shape having corners (FIGS. 3 to 5), It may be circular, oval, or the like. When the planar view shape of the high pressure section is circular or otherwise without corners, the flexibility is increased compared to the high pressure section including the high pressure section having a planar shape with corners, so the feeling of wearing is improved. It is preferable from the viewpoint of allowing

In the illustrated example, the first high compression section sections 131A, 131B, ... included in the first high compression section 121 and the second high compression section sections 132A, 132B, ... included in the second high compression section 122 are: They are arranged shifted in the longitudinal direction D1. In this specification, the fact that the position of the first high-pressing section and the position of the second high-pressing section are displaced in the longitudinal direction D1 means that the first high-pressing section and the second high-pressing section are It means that the positions of the front ends and/or the rear ends are not aligned in the longitudinal direction D1 and/or the positions of the centers in the longitudinal direction D1 are not aligned in the longitudinal direction D1. In the example shown in FIGS. 8 and 9, the first high compression section 131A, 131B, . . . and the second high compression section 132A, 132B, . Neither the positions of both edges nor the position of the center in the longitudinal direction D1 are aligned in the longitudinal direction D1.

The arrangement of the first high-compression section sections 131A, 131B, ... and the second high-compression section sections 132A, 132B, ... included in the second high-compression section 122 as described above may be used when forming the high-compression sections during manufacturing. be advantageous to The high press section can be formed, for example, by passing the absorbent article in the longitudinal direction D1 between a pair of rolls having an axis along the transverse direction D2, in which case a single pass will form the first high press section. 121 and the second high compression portion 122 can be formed together. At that time, if the positions of the first high-pressing section and the second high-pressing section are deviated in the longitudinal direction D1, one of the high-pressing section is mainly compressed, or one of the high-pressing section is compressed. Since the only part is pressed, the pressure of the rolls is not dispersed, and one high press section can be formed more reliably with a clear contour.

Furthermore, the first high compression section sections 131A, 131B, ... included in the first high compression section 121 and the second high compression section sections 132A, 132B, ... included in the second high compression section 122 are arranged in the longitudinal direction D1. A staggered arrangement is preferred.

Although the present invention has been described above based on the embodiments, the present invention is not limited to these embodiments. In addition, the above embodiments can be modified, modified, replaced, added, deleted, combined, etc. within the scope of the claims, and these also belong to the technical scope of the present invention. Thus, any feature described in this specification may be combined with another feature. For example, the configuration of the central groove 211 in the second embodiment can be applied instead of the central groove 11 of the absorbent article 1 shown in FIG.

Reference Signs List 1, 101 Absorbent article 2 Back sheet 3 Top sheet 4 Absorber 7 Side sheet 11 Central groove 14 Non-compressed portion 20 Highly compressed portions 21, 121 First highly compressed portions 31A, 31B, 31C, 31D, ..., 131A, 131B , . . . 1st highly compressed portion segments 22, 122 2nd highly compressed portion segments 32A, 32B, 32C, 32D . . . , 132A, 133B, . Line D1 Longitudinal direction D2 Lateral direction F Front region IP Intersection M of virtual wavy lines Middle region R Rear region Q Body fluid outlet facing region WL1 First virtual wavy line WL2 Second virtual wavy line

Claims (7)

Equipped with a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body provided between the top sheet and the back sheet, the longitudinal direction and the lateral direction perpendicular to the longitudinal direction An absorbent article having
a longitudinally extending central groove recessed from the topsheet toward the backsheet;
A highly compressed portion is formed in the central groove in plan view,
The highly compressed portion is divided into a discontinuous first highly compressed portion along the first phantom wavy line extending in the longitudinal direction and a second phantom wavy line extending in the longitudinal direction intersecting the first phantom wavy line. a discontinuous second press along
The absorbent article, wherein the first virtual wavy line and the second phantom wavy line are symmetrical with respect to a longitudinal center line extending along the longitudinal direction of the absorbent article. said first press section being formed from a plurality of longitudinally spaced apart first press sections;
said second press section being formed from a plurality of longitudinally spaced apart second press sections;
2 to 5 of each of the first high compression section and the second high compression section are arranged between the intersections of the first virtual wavy line and the second wavy line which are adjacent to each other. The absorbent article described. 3. The absorbent article according to claim 2, wherein no high compression portion is located at said intersection. 4. The absorbent article according to claim 2 or 3, wherein at least the edges of said first high compression section have sides parallel to transverse directions orthogonal to said longitudinal direction. 5. The method according to claim 4, wherein one edge of said first high compression section and one edge of said second high compression section, which are arranged side by side in said horizontal direction, are located on a common straight line along said horizontal direction. absorbent article. 4. The absorbent article according to claim 2 or 3, wherein the position of the first high compression section and the position of the second high compression section are offset when viewed in the longitudinal direction. further comprising a pair of oblique grooves extending outward in the longitudinal direction from at least one end of the central groove in the longitudinal direction and formed so that the distance between each other increases as the distance from the central groove increases;
7. The absorbent article according to any one of claims 1 to 6, wherein discontinuous high compression portions are formed in the pair of oblique grooves.

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