CN109069328B

CN109069328B - Absorbent article

Info

Publication number: CN109069328B
Application number: CN201780025901.8A
Authority: CN
Inventors: 泷山吉宏; 野田敏弘
Original assignee: Oji Holdings Corp
Current assignee: Oji Holdings Corp
Priority date: 2016-04-26
Filing date: 2017-04-07
Publication date: 2022-03-04
Anticipated expiration: 2037-04-07
Also published as: WO2017187944A1; TW201740892A; CN109069328A; RU2713974C1; JP2017196064A; JP6380452B2; TWI642417B

Abstract

The invention provides an absorbent article comprising a liquid-permeable topsheet (14), a liquid-impermeable backsheet (12), and an absorbent body (13) disposed between the topsheet (14) and the backsheet (12), characterized in that a plurality of compressed rows (22) are arranged, each of which is composed of a plurality of recesses (21) formed by compressing the absorbent body (13) and intersects with each other, and that a low-basis-weight portion (23) is provided in the intersection region (25) of the compressed rows (22) and/or in the periphery of the intersection region (25).

Description

Absorbent article

Technical Field

The present invention relates to an absorbent article, and more particularly to a disposable diaper or absorbent pad.

Background

In absorbent articles such as disposable diapers (hereinafter, also simply referred to as "diapers"), various improvements have been made to improve their functions and wearing comfort.

The absorbent article absorbs a large part of discharged body fluid through the absorbent body. Here, since the diaper covers the abdomen, hip, and crotch, it is affected by various body movements, particularly leg movements, such as walking, turning, and baby crawling. In particular, the absorbent body may wrinkle, bend, or break due to various movements of the body. In this case, fit between the crotch of the diaper is reduced, and leakage is likely to occur. Further, when the content of a Super Absorbent Polymer (hereinafter also referred to as "SAP") in the Absorbent material is increased in order to improve the absorption retention of the Absorbent material, the flexibility of the Absorbent material itself tends to be lost.

Therefore, as seen in patent document 1, there is an article in which the skin contact surface side of the absorbent body is embossed by oblique lattice-like compressed grooves extending obliquely with respect to the direction from the front body to the back body of the diaper. By embossing the absorbent body in this manner, the fit of the diaper between the crotch can be improved to follow the back and forth movement of the legs or the curvature of the buttocks, and leakage of body fluid can be suppressed.

Such embossing is performed by rotating an embossing roller having an embossing pattern protruding from the surface of the absorbent sheet over a long length of the absorbent sheet. In the production of diapers, an embossing roller is rotated on a long absorbent sheet or the like to perform embossing, and then various sheets are subjected to operations such as lamination and cut into a desired size.

[ Prior art documents ]

[ patent document ]

[ patent document 1] Japanese patent laid-open No. 2015-016218

Disclosure of Invention

Problems to be solved by the invention

In order to prevent the grooves from being crushed even when pressure due to the weight of the wearer is applied, a compressed groove has been proposed in which the absorbent body is more difficult to crush by compressing the topsheet together with the absorbent body from the topsheet (topsheet) side disposed on the skin contact surface side of the absorbent body. In this case, as described above, the compressed groove is formed by rotating the embossing roller on the absorbent body on which the top sheet is laminated. When the compressed grooves are formed in this manner, the topsheet or the like positioned on the upper layer than the absorbent body is recessed into the grooves by the rotation of the embossing roller, and the topsheet or the like is likely to be in a strongly stretched state. In particular, an embossed pattern having a component extending in an oblique direction, such as a diagonal lattice pattern, has a portion in which the distance between points in the vicinity of lattice points, which are compressed at the same time, is short (the interval is narrowed). At the same time, if the distance between the compressed points is short, the force of stretching the front sheet from both the adjacent compressed points acts strongly, and the front sheet is likely to be in a strongly stretched state. In this case, the powder-like SAP in the absorbent body is pressed against the front sheet, and therefore the front sheet in the crossing region is easily broken at the embossing.

The compressed grooves themselves are located at a lower position than the uncompressed portion, and therefore do not directly contact the skin of the wearer, but the vicinity of the lattice points, that is, the intersection regions of the lattices and/or the peripheries thereof are fixed in a state in which the topsheet and the absorbent body are stretched and strongly stretched. Therefore, there is a case where the powder-like SAP in the absorbent body is abutted against the front sheet. In this way, the intersecting region of the lattice on the skin contact surface of the topsheet and/or the periphery thereof becomes a relatively hard portion compared with other portions, such as transmitting the rough feeling of the super absorbent resin as a texture.

This crossing region of the lattice is not preferable because it comes into contact with the skin of the wearer, and therefore gives the skin of the wearer a firm and rough touch. In particular, since the diaper is in contact with a soft skin portion such as a crotch, a soft skin touch is required, and if the cross portion of the lattice is hard, the touch to the skin is not preferable.

The present invention has been made in view of such problems, and an object thereof is to: provided is an absorbent article which, even when an absorbent body is formed with a grid-like embossed pattern, does not cause the intersecting region and/or the periphery thereof to become rigid and is easily bent, thereby improving the feeling of use (flexibility) of the wearer.

Means for solving the problems

In order to achieve the above object, an absorbent article of the present invention includes a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorbent body disposed between the topsheet and the backsheet, and is characterized in that a plurality of compressed rows are arranged, each of which is composed of a plurality of concave portions formed by compressing the absorbent body and intersects with each other, and a low basis weight portion is provided in at least one of an intersection region of the compressed rows and a periphery of the intersection region.

Effects of the invention

As described above, according to the present invention, even when the absorbent body is formed with the lattice-like embossed pattern, the intersecting region and/or the periphery thereof are not made hard and easily bent, and are not easily broken, and the use feeling (softness, non-roughness) of the wearer is improved.

Drawings

Fig. 1 is a perspective projection view showing an appearance of an embodiment in which the absorbent article of the present invention is applied to an open-type disposable diaper.

Fig. 2 is a partially broken plan view of the diaper shown in fig. 1, as viewed from the skin contact surface side.

Fig. 3 is a cross-sectional view of the diaper shown in fig. 2 cut along line iii-iii.

Fig. 4 is a perspective view showing the diaper shown in fig. 1 in an exploded state.

Fig. 5 is a partial plan view of the absorbent part of the diaper shown in fig. 1, viewed from the topsheet side.

Fig. 6 is an enlarged partial top view of a portion of the compressed row in fig. 5.

Fig. 7 is a sectional view taken along line VII-VII of fig. 6.

Fig. 8 is a sectional view taken along line VIII-VIII of fig. 6.

Fig. 9 is a sectional view taken along line IX-IX of fig. 6.

Fig. 10 is a sectional view taken along line X-X of fig. 6.

Fig. 11 is a cross-sectional view taken along line X-X of fig. 6 according to a modification of the present invention.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to these embodiments, and other absorbent articles falling under the concept of the present invention are also included.

[ embodiment 1]

Fig. 1 is a perspective view of an open-type disposable diaper (so-called sheet-type disposable diaper) according to embodiment 1 of the present invention, as viewed from the front side. Fig. 2 is a plan view of the diaper shown in fig. 1, as viewed from the skin contact surface side. Fig. 3 shows a sectional view of fig. 2 taken along the line iii-iii. Fig. 4 shows a divided state obtained by cutting and spreading the unfolded disposable diaper shown in fig. 1 and 2.

The open-type disposable diaper (hereinafter, may be simply referred to as a diaper) 10 in the present embodiment includes a front body region 10F, a rear body region 10R, and a crotch region 10C connecting the front body region 10F and the rear body region 10R. Further, a waist opening 10W is formed in a portion surrounding the waist of the wearer when the wearer wears the front body section 10F and the back body section 10R. Similarly, a pair of left and right leg hole openings 10L are formed to surround the thigh portions of the legs of the wearer with the lower ends of the front body region 10F and the rear body region 10R and the crotch region 10C.

When the diaper 10 is worn, the front body panel region 10F is positioned on the ventral side of the wearer, and the rear body panel region 10R is positioned on the back side of the wearer. Then, the crotch region 10C covers the crotch of the wearer, and the legs of the wearer pass through the pair of left and right leg hole openings 10L. Therefore, the leg hole openings 10L are located at arbitrary positions from the base of the legs to the periphery of the thighs of the wearer.

A line along the body center axis from the head to the crotch of the wearer when the diaper 10 is worn in the correct orientation is used as the virtual line P in the following description as needed. As shown in fig. 1, an imaginary line P extends through the crotch portion from the stomach side to the back side in the central portion of the diaper 10. Specifically, for example, when the waist portion side of the diaper 10 is taken as the upper side and the crotch lower side is taken as the lower side, the virtual line P extends in the up-down direction along the front of the diaper 10 and also extends in the up-down direction on the back side via the crotch portion. In other words, the vertical direction is a direction along the body center axis from the head to the crotch of the wearer, and the virtual line P extends along the body center axis.

A pair of left and right fastening tapes 10A are joined to both left and right end edges of the back sheet region 10R of the covering sheet 11 positioned outside the diaper 10, and these fastening tapes 10A overlap both left and right end edges of the front sheet region 10F when worn and connect both, thereby forming the leg hole openings 10L. The fastening tape 10A is joined to the front adhesive sheet 10B joined to the covering sheet 11 in the front body region 10F so as to be repeatedly releasable therefrom. An elastic sheet 10D is joined to the upper end of the back body region 10R of the covering sheet 11, and the elastic sheet 10D extends in the width direction of the covering sheet 11 to give the wearer a moderate wearing sensation around the waist.

As shown in fig. 2 to 4, the diaper 10 of the present embodiment is formed by sequentially overlapping and joining a cover sheet 11, a liquid impermeable back sheet (back sheet) 12, an absorbent body 13 (hereinafter, also simply referred to as an absorbent body 13) wrapped with a core sheet (tissue) 15, which is a hydrophilic thin sheet, and a top sheet (topsheet) 14 in contact with the skin of the wearer, from the outside when viewed from the skin side of the wearer.

A pair of semicircular notches 11A, which form leg openings 10L, are formed on both left and right sides of the crotch region 10C of the cover sheet 11. A liquid-impermeable back sheet 12 is joined to the covering sheet 11, a conventional absorbent body 13 is disposed between the back sheet 12 and a liquid-permeable top sheet 14, and the top sheet 14 is joined to the back sheet 12 via the absorbent body 13. Rubber threads 16 for forming leg gathers are joined in an extended state to the vicinities of the centers of both left and right side edge portions in the width direction of the back sheet 12.

The liquid-permeable topsheet 14 of the present embodiment includes a pair of liquid-impermeable (or water-repellent) side sheets 18 that form three-dimensional gathers at both lateral edges in the width direction. The pair of side sheets 18 are members as described below: the outer edge portion is formed in the same shape as the pair of cutout portions 11A of the cover sheet 11, and stands along both left and right side edge portions of the absorbent member 13 when worn, to prevent leakage of urine excreted by the wearer. In each of the pair of side sheets 18, a rubber thread 19 as a three-dimensional drape stretchable member is arranged in an extended state so as to be folded back and held at the inner edge portion toward the absorbent body 13, and when the rubber thread 19 is contracted, the side sheet 18 is raised in the direction in which the skin of the wearer is in contact. The three-dimensional gathers can be formed in a known manner as used in known disposable diapers. For example, the water repellent sheet can be formed by sandwiching and fixing a stretched three-dimensional wrinkle stretchable material between layers of a water repellent sheet. As shown in fig. 2, the side sheet 18 is pulled in the longitudinal direction by the expansion and contraction of the rubber thread 19. As shown in fig. 3, the inner edge portion is formed as a standing three-dimensional fold.

The diaper 10 of the present embodiment is an article in which the absorbent body 13 is elongated along the imaginary line P, and the longitudinal direction thereof is parallel to the imaginary line P. The direction perpendicular to the virtual line P is defined as the width direction. The ratio of the longitudinal direction to the width direction of the diaper 10 is not limited to the present embodiment. The ratio can be appropriately changed according to the body shape of the wearer.

Next, the structure of the absorber portion in the present embodiment will be described.

Fig. 5 is a partial plan view of the absorbent member 13 and the topsheet 14 when viewed from the topsheet 14 side.

The absorber 13 of the present embodiment located below the top sheet 14 mainly includes pulp (indicated by reference numeral 29 in fig. 7 and 8 described below) and SAP (indicated by reference numeral 27 in fig. 7 and 8 described below). The absorbent member 13 is formed in an elongated shape so as to extend over the front body, crotch, and rear body. And is divided into three parts of a front body part M1, a crotch part M2, and a rear body part M3. In the crotch portion M2, a pair of arcuate cutouts 13A are formed in comparison with a pair of left and right leg openings 10L surrounding the thigh portions of both legs. The notch 13A may not be formed corresponding to the size of the absorbent body 13. The absorbent body 13 of the present embodiment is an hourglass-shaped article having the notch 13A and a central portion having a narrower width than the front and rear ends, but the shape of the absorbent body of the present invention is not limited to this. The shape of the back-and-forth (up-and-down) portion may be a shape in which the corners of the front-and-back (up-and-down) ends are cut into a curved shape, an oval shape extending back-and-forth (up-and-down), a circular shape, a rectangular shape having a length in the front-and-back (up-and-down) left-and-right directions of the same degree, or the like.

Further, the absorbent body 13 is wrapped with, for example, a core sheet 15 in order to maintain its shape, and the core sheet 15 is a hydrophilic thin sheet whose ends are joined to each other by coating paste. The absorbent body 13 wrapped with the core sheet 15 is disposed between the back sheet 12 and the top sheet 14. The top sheet 14 is joined to the back sheet 12 via the absorbent body 13 wrapped with the core sheet 15. In the present embodiment, the absorbent body 13 wrapped with the core sheet 15 is used, but the absorbent body in the present invention may not be wrapped with the core sheet.

As shown in fig. 5, the diaper 10 has a compressed part forming region (embossed pattern forming region) N1 which is formed by compressing the topsheet 14 from the surface toward the absorbent member 13 by regular embossing. In the compressed portion forming region N1, a plurality of compressed lines 22 are arranged and extended, and the compressed lines 22 are formed by a plurality of concave portions 21 formed continuously by compression, and the plurality of concave portions 21 are arranged in a diagonal lattice pattern. The plurality of compression rows 22 are interdigitated. Further, in the region where the compression rows 22 are not formed among the compression portion forming regions, a non-compressed main absorbent region 25 is mainly provided. As shown in fig. 5, the embossed pattern is not formed at both ends of the absorbent body 13. Therefore, the absorbent body 13 has a compressed part non-forming region (embossed pattern non-forming region) N2 on both sides of the compressed part forming region (embossed pattern forming region) N1. The purpose is as follows: body fluid is prevented from leaking from the leg hole openings 10L along the embossed pattern.

In the present embodiment, the embossed pattern is formed up to the upper end of the front body panel portion M1 and the lower end of the rear body panel portion M3. By forming the embossing pattern in this manner to the upper and lower ends, there is produced an effect that the air permeability of the diaper 10 is improved and the absorbent body 13 becomes easily flexed to fit the diaper 10 to the body of the wearer. In the present invention, the emboss pattern may be formed not to the upper end of the front body section M1 and the lower end of the back body section M3 of the absorbent body 13, or to the left and right ends of the absorbent body 13.

The concave portion 21 in the present embodiment is inclined with respect to a virtual line P along the central axis of the body of the wearer when the diaper is worn. Specifically, the recess 21 includes a right recess 21a inclined in the right direction in the drawing with respect to the virtual line P in the 1 st direction at a predetermined angle α, and a left recess 21b inclined in the left direction in the drawing with respect to the virtual line P in the 2 nd direction at a predetermined angle β. The recesses 21 inclined in the same direction are arranged in a row with the diagonal line of the lattice 1 as the length L1, and are formed with a lattice-like embossed pattern extending obliquely. In the present embodiment, the predetermined angle α and the predetermined angle β are set to the same value, but they may be set to different values. In the present embodiment, the plurality of concave portions 21 are formed by collectively compressing the top sheet 14, the core sheet 15, and the absorber 13 on the top sheet 14 side. In the present invention, the absorbent body 13 may be embossed together with the top sheet 14 as in the present embodiment, or the top sheet 14 may be attached to the embossed absorbent body 13 subsequently.

As shown in fig. 5, a line formed by arranging the plurality of right-direction concave portions 21a is defined as a 1 st compression line 22a, and a line formed by arranging the plurality of left-direction concave portions 21b is defined as a 2 nd compression line 22 b. These compression rows 22 are straight lines inclined at the same angle as the inclination angle of the concave portion 21 with respect to the virtual line P. The 1 st compression row 22a extends parallel spaced apart from one another by a spacing S1. Further, the 2 nd compression row 22b extends in parallel with each other at the interval S2. In this way, the 1 st compression row 22a and the 2 nd compression row 22b are extended to form a diagonal lattice-shaped emboss pattern. In the present embodiment, the 1 st compression row 22a and the 2 nd compression row 22b intersect with each other, and thus the intersection region 25 is formed. In the present embodiment, the intervals S1 and S2 are set to the same value, but they may be set to different values.

In addition, the low basis weight portion 23 is provided in the intersecting region 25 of the compression row 22 and/or the periphery thereof. Fig. 6 is a schematic diagram showing a part of the compression row of the arrow VI portion in fig. 5 enlarged. Fig. 5 and 6 are drawn with the side sheet 18 omitted for convenience. In fig. 5 and 6, the low basis weight portion 23 is indicated by a two-dot chain line. The low basis weight portion 23 is formed by adjusting the basis weight of pulp or SAP constituting the absorbent body 13 to reduce the basis weight when manufacturing the absorbent body 13.

As shown in fig. 6, on the surface of the absorbent body 13 of the present embodiment, a cross region 25 in a diagonal lattice shape of the 1 st compressed line 22a and the 2 nd compressed line 22b is formed. Further, a plurality of low basis weight portions 23 are formed on the surface of the absorbent body 13, and these low basis weight portions 23 extend in the extending direction (longitudinal direction) of the absorbent body 13 and are regions including a plurality of intersecting regions 25.

The low basis weight portions 23 of the present embodiment are arranged in parallel with each other at an interval L2. However, the low basis weight portions 23 of the present invention are not limited to being arranged in parallel as long as they are provided in the intersecting region 25 and/or the periphery thereof, that is, the region having a lower basis weight than the periphery thereof may be formed so as to overlap at least a part of the intersecting region 25 and/or the periphery thereof, and various forms may be employed.

The low basis weight portion 23 is disposed so as to include the intersecting region 25 as described above. In the present embodiment, when the absorbent body 13 is compressed, the concave portions 21 are formed in the intersecting regions 25, and at this time, the portions where the low-basis weight portions 23 are formed are compressed, but the density of the compressed portions becomes low. Therefore, the density of the absorbent body 13 of the low basis weight portion 23 in the intersecting region 25 is lower than the density of the absorbent body 13 of the region where the compressed rows 22 are formed other than the low basis weight portion 23.

In the present embodiment, as shown in fig. 5, the low basis weight portion 23 includes a longitudinal low basis weight portion 23c formed in parallel with the virtual line P. A row in which the plurality of longitudinal low basis weight portions 23c are arranged is a low basis weight row 24 c. In the present embodiment, the low-basis weight portions 23 are in the form of longitudinal stripes, but the present invention is not limited thereto, and the low-basis weight portions may be arranged so as to include the intersecting regions 25 and/or the periphery thereof, and the width of the longitudinal stripes in the present embodiment may be increased or decreased. In addition, for example, various shapes such as a quadrangle, a circle, an ellipse, and a triangle can be adopted.

The low-basis weight portion 23 of the present embodiment is formed, for example, by the following steps (1) to (6). The absorbent pad (in the description of this step, an absorbent body without core pieces is indicated) is formed by mixing pulp with SAP in powder form and blowing the resulting mixture towards a filter of, for example, 2 forming drums.

(1) First, an absorbent pad having a constant thickness is produced by the first forming roll 1.

(2) Next, an absorbent pad is intermittently produced by the 2 nd forming roll so that voids are formed in the portion corresponding to the low basis weight portion 23, and the absorbent pad produced in the step (1) is laminated thereon. Thus, an absorbent pad having a recess is produced.

(3) Then, the absorbent pad having the above-described pockets is wrapped with the core sheet 15, and the core sheet 15 is adhered to the absorbent pad with a hot-melt adhesive or the like to produce the absorbent body 13.

(4) The absorbent body 13 thus produced was cut into a size of one diaper.

(5) The top sheet 14 is laminated on the cut absorbent body 13.

(6) The topsheet 14 and the absorbent member 13 are compressed by an embossing roller.

By the suction conveyance of the absorbent body 13 in the step (3), the embossing process in the step (6), and the like, the core-spun sheet 15 adheres to the depressed portions of the depressions, and the low basis weight portions 23 have a shape shown in, for example, fig. 8 described below. The low basis weight portion 23 may be provided not only by 2 forming rolls as in the present embodiment but also at the time of embossing in the present invention. For example, the low basis weight portions 23 are provided in the intersecting region 25 by pressing the intersecting region 25 so that the absorbent body 13 in the intersecting region 25 scatters around.

In the intersection region 25 of the concave portion 21, since the stretching increases as the distance of the compressed portion approaches, the basis weight is preferably decreased according to the distance in order to make the top sheet 14 less likely to break. Therefore, the basis weight of the low basis weight portion 23 is preferably formed to be lower toward the center of the intersecting region 25 (for example, in a mortar shape). With this configuration, the cross region 25 does not become rigid, so that the topsheet 14 is less likely to be broken, and the diaper 10 is easily bent in any direction with the grid edge extending direction of the concave portion 21 as an axis, so that the fit can be improved.

In the present embodiment, the recessed portions 21 of the cross-hatched embossed pattern are formed by pressing while rotating an embossing roller having a die formed on the surface thereof so as to fit the recessed portions 21. As shown in fig. 5, when the embossing roller travels in the direction of the arrow W (the direction from the front body section M1 toward the back body section M3) while rotating, all the portions of the concave sections 21 arranged in the direction perpendicular to the traveling direction W of the embossing roller are simultaneously pressed. In the present embodiment, the size of the corrugated roll is determined so that the circumference of the corrugated roll corresponds to the length of the absorbent body 13 in the longitudinal direction, but the present invention is not limited thereto.

In the present embodiment, the traveling direction W of the embossing roller is parallel to the direction of the imaginary line P when the diaper 10 is completed. As described above, the topsheet 14 is laminated on the absorbent member 13 cut in the size of the diaper 10, and the topsheet 14 is compressed together with the absorbent member 13 by the embossing roller. Since the cutting is performed over the length of the front, crotch, and back parts of the diaper 10, the running direction W of the embossing roller is also parallel to the virtual line P, whereby an oblique-lattice-shaped embossing pattern inclined with respect to the virtual line P can be formed. Thus, in the present embodiment, since the traveling direction W of the embossing roller is parallel to the extending direction of the low-basis weight portions 23, it is easy to align the plurality of intersecting regions 25 with the low-basis weight portions 23.

Therefore, the right concave portion 21a is inclined rightward with respect to the traveling direction W, and the left concave portion 21b is inclined leftward. Therefore, as the embossing roller travels in the traveling direction W, the distance between the adjacent right-direction recessed portions 21a and left-direction recessed portions 21b becomes shorter as it goes to the intersection region 25.

Here, when the embossing roller forming the concave portion 21 presses, the top sheet 14 is stretched so as to be drawn into the concave portion 21. Since the adjacent right-direction concave portions 21a are formed by being pressed simultaneously with the left-direction concave portions 21b, the top sheet 14 therebetween is stretched from the left and right. That is, in fig. 6, the top sheet 14 is stretched by applying a pulling-in force indicated by an arrow a simultaneously to the left and right. As the distance between the adjacent right-direction concave portion 21a and left-direction concave portion 21b becomes shorter, the allowance of the top sheet 14 with respect to the pulling force a becomes smaller, and thus the top sheet 14 is gradually strongly stretched. Therefore, the SAP in the absorbent body 13 hits the topsheet 14, and a rough surface feel of the topsheet 14 is formed. This is not preferable because it causes irritation to the skin of the wearer.

Further, when the embossing roller is pressed deeply to form the concave portion 21, the top sheet 14 is further drawn, and therefore, the top sheet 14 may be broken. However, if the concave portions 21 are formed by pressing only the embossing roller shallowly, the adhesion effect between the top sheet 14 and the absorbent body 13 is weakened, and the top sheet 14 is easily peeled from the absorbent body 13, and even a clear embossed pattern cannot be formed.

Therefore, the concave portions 21 of the present embodiment enter the intersecting region 25 having a low basis weight while the distance between the adjacent right concave portion 21a and left concave portion 21b is shortened, and thus the concave portions 21 are formed without strongly stretching the top sheet 14. This reduces the number of absorbent bodies 13 that are pushed in, and therefore the top sheet 14 is less likely to be broken, and the corner portions formed in the intersecting region 25 do not become hard and feel better, and the surface of the top sheet 14 is in a smooth state. Further, the top sheet 14 can be prevented from being peeled from the absorbent body 13 while maintaining the flexibility of the top sheet 14 and the absorbent body 13.

In the concave portions 21 of the present embodiment, intersecting regions 25 having a low basis weight are formed intermittently in the extending direction of the compression rows 22. Thus, the diaper 10 of the present embodiment can improve the ease of folding and flexibility in the intersecting regions 25 of the compressed rows 22 as compared with the case where only the concave portions 21 are formed, and can provide a softer skin feel to the wearer of the diaper 10.

Fig. 7 is a schematic diagram showing an enlarged cross-sectional shape of line VII-VII of fig. 6, fig. 8 is a schematic diagram showing an enlarged cross-sectional shape of line VIII-VIII of fig. 6, fig. 9 is a schematic diagram showing an enlarged cross-sectional shape of line IX-IX of fig. 6, and fig. 10 is a schematic diagram showing an enlarged cross-sectional shape of line X-X of fig. 6. In the cross-sectional views of fig. 7 to 10, the density of the absorber 13 is represented by the density of dots.

As shown in fig. 7, the cross-sectional shape near the recess 21 is such that the open end is wider than the bottom. The portion denoted by reference numeral 13D is a high basis weight compressed portion which is compressed at a high basis weight in the absorbent body 13. The portion denoted by reference numeral 13E is a high basis weight and non-compressed high basis weight non-compressed portion in the absorbent body 13. That is, the high basis weight compressed portions 13D indicate the concave portions 21 other than the intersecting regions 25, and the high basis weight non-compressed portions 13E indicate the absorbent body 13 in the main absorbent region 26. Here, the absorbent body 13 is one mainly containing SAP and pulp as described above, and the density is mainly related to the pulp fiber density. Therefore, the high-basis-weight pressing portion 13D is in a state where the pulp is compressed and the gap between the pulps is small, while the high-basis-weight non-pressing portion 13E is in a state where the gap between the pulps is larger than that of the high-basis-weight pressing portion 13D.

Further, since the concave portions 21 are formed by compressing and bonding the top sheet 14, which is synthetic fibers, together with the absorbent body 13, which is mainly composed of pulp, in a film shape, the bottom surfaces of the concave portions 21 promote the diffusion of the body fluid in the extending direction of the compression rows 22 until the body fluid is absorbed.

Turning to fig. 8, in the present embodiment, the absorbent body 13 is bonded to the top sheet 14 and the core sheet 15 in the low basis weight portion 23. In fig. 9, the cross-sectional shape of the intersection region 25 is shown. The portion denoted by reference numeral 13F is a low basis weight and non-compressed low basis weight non-compressed portion in the absorbent body 13. The portion denoted by reference numeral 13G is a low basis weight and squeezed low basis weight squeeze portion in the absorbent body 13. That is, the low-basis-weight non-pressed portions 13F indicate non-pressed portions in the low-basis-weight portions 23, and the low-basis-weight pressed portions 13G indicate pressed portions in the low-basis-weight portions 23. In the present embodiment, as shown in fig. 9, the low-basis-weight portions 23 (low-basis-weight pressing portions 13G) in the intersecting region 25 are also pressed until the thickness is the same as that of the recessed portions 21, but the density can be maintained lower than that of the recessed portions 21 (high-basis-weight pressing portions 13D) other than the intersecting region 25 because the basis weight is low. That is, as shown in fig. 9, the absorbent body 13 (low basis weight compressed portion 13G) in the intersecting region 25 is compressed as compared with the low basis weight non-compressed portion 13F shown in fig. 8, but has a lower density than the recessed portions 21 (high basis weight compressed portion 13D) other than the intersecting region 25. In this way, in the intersecting region 25 of the absorbent body 13, maintenance of low density and reduction of thickness can be achieved at the same time, and therefore flexibility can be maintained in the intersecting region 25. In the present embodiment, the density of the absorbent body 13 (low basis weight compressed portion 13G) in the intersecting region 25 is lower than the density of the absorbent body 13 (high basis weight compressed portion 13D) in the region where the compressed rows 22 are formed other than the intersecting region 25. In the present invention, as long as the effect of softening the intersecting region 25 and/or the periphery thereof is exhibited, a mode in which the density of the absorbent body 13 of the low basis weight portion 23 is equal to or higher than the density of the absorbent body 13 of the intersecting region 25 is allowed. In the present embodiment, as shown in fig. 10, the thickness of the absorbent body 13 in which the bottoms of the compressed rows 22 including the intersecting regions 25 are formed is substantially constant, but the present invention is not limited to this. For example, the compression may be performed so that only the intersection region 25 becomes thinner. That is, in the intersecting region 25 where the low-basis weight portion 23 is provided, a recessed portion deeper than the recessed portions 21 of the compression rows 22 may be provided. According to this configuration, the presence of the low-basis weight portion 23 not only softens the intersecting region 25 but also thins the intersecting region 25, so that the intersecting region 25 is easily bent. At this time, the density of the absorbent body 13 of the low basis weight portion 23 in the intersecting region 25 may be equal to or higher than the density of the absorbent body 13 of the compression row 22 other than the low basis weight portion 23.

As shown in fig. 10, in the compressed row 22, the density of the low-basis-weight compressed portions 13G of the absorbent body 13 in the compressed row 22 that is a region including the intersecting region 25 is lower than the density of the high-basis-weight compressed portions 13D of the absorbent body in the region in which the depressions are formed in the compressed row 22 that is a region not including the intersecting region 25.

Next, an embodiment of an embossed pattern formed by embossing will be described.

As shown in fig. 5, the embossing pattern of the present embodiment is a lattice shape formed by arranging a plurality of continuously extending concave portions 21, and the concave portions 21 are arranged so that the length of a diagonal line L1 of a lattice 1 becomes 42mm (4.2 cm). As shown in fig. 5 and 6, the embossing pattern of the present embodiment is such that the 1 st compressed line 22a extends in parallel at an interval S1, and the 2 nd compressed line 22b extends in parallel at an interval S2. Then, the 1 st compression line 22a and the 2 nd compression line 22b form a diagonal lattice-like embossed pattern. The lengths S1 and S2 of 1 side of the lattice in this embodiment are equal and 29.7 mm. The interval between the grids is preferably 13.0mm to 54.0 mm.

Here, the depth of the concave portion 21 of the absorber 13 is D1, the thickness of the absorber 13 and the top sheet 14 before embossing, that is, the maximum thickness of the main absorbent region 26 including the absorber 13 and the top sheet 14 is D2, the thickness of the diaper 10 having the concave portion 21 is D3, and the thickness of the absorber 13 having the concave portion 21 is D4. In the present embodiment, the thickness D2 is 8.0mm, preferably 5.0mm to 20.0 mm. In the present embodiment, as shown in fig. 7, the thickness D3 is 1.0 mm. The thickness D4 (see fig. 7) of the absorber 13 of the concave portion 21 is preferably 0.2mm to 0.6 mm.

In this way, the depth D1 of the recess 21 is about 42.5% to 97.5% of the thickness D2. As described above, the concave portions 21 in the present embodiment are formed by compressing the absorbent body 13 in the direction of the back sheet 12 during the pressing by the embossing roller.

The density of the absorbent body 13 (low basis weight compressed part 13G) in the intersecting region 25 in the embossed pattern of the present embodiment is 0.8G/cm³Preferably 0.5g/cm³～1.2g/cm³. In addition, the density of the absorbent body 13 (high basis weight compressed part 13D) of the concave part 21 other than the intersecting region 25 of the present embodiment is 1.38g/cm³Preferably 0.8g/cm³～1.9g/cm³. Further, the density of the absorbent body 13 (high basis weight non-compressed part 13E) other than the concave part 21 of the present embodiment is 0.05g/cm³Preferably 0.03g/cm³～0.07g/cm³。

By forming the absorber 13 with such a density distribution, the rigidity of the intersecting region 25 can be made soft. Therefore, even when the absorbent body 13 is formed with a grid-like embossed pattern, the intersecting region 25 does not become hard and is easily bent, and the feeling of use (flexibility) of the wearer can be improved.

By forming the concave portions 21 at such a depth and interval, the groove can be maintained even when a body weight is applied, and a soft skin touch feeling can be maintained on the skin contact surface in the crotch portion of the diaper. Therefore, the oblique lattice-like embossed pattern can suppress deformation such as wrinkling due to various motions of the diaper with respect to the legs, and can soften the touch of the skin to minimize irritation to the skin.

Here, as shown in fig. 6, the thin and medium-density intersection region 25 is Q1, the thin and high-density region sandwiching the compression row 22 in the width direction is Q2, the thick and low-density main absorption region 26 is Q3, and the thin and high-density region along the extending direction of the compression row 22 is Q4. The sequence of the stiffness (bending difficulty, bending strength) of the diaper 10 having such a density distribution can be a sequence from a soft (and easily bendable) portion to a hard (and not easily bendable) portion, i.e., a region Q1 < a region Q3 < a region Q2 < a region Q4.

As described above, the region Q4 along the extending direction of the compressed rows 22, which is thin and high-density, is formed most rigidly as to the rigidity of the absorbent body 13, and the rigidity of the absorbent body 13 is softened in the direction across the intersection region 25, so that the diaper 10 can be deformed so that the diaper 10 bulges in a direction away from the wearer's body and a space is maintained between the wearer's body and the diaper 10 when the wearer moves while wearing the diaper 10. Thus, even when the absorbent body 13 is formed with a grid-like embossed pattern, the intersecting region 25 is not hard but easily bent, and the feeling of use (flexibility) of the wearer can be improved. Further, by making the intersecting region 25 soft, the absorbent body 13 can be prevented from being easily broken in the intersecting region 25 by the movement of the wearer.

[ modified examples ]

The present invention is not limited to the above-described embodiments, and can be modified and changed as appropriate without departing from the scope of the technical idea of the present invention.

For example, in the above-described embodiment, the case where the embossing is performed using an embossing roller has been described, but the embossing is not limited to this method, and may be a method of embossing the diaper in units of the size of the diaper by a plate-like embossing plate that matches the size of the diaper.

The top sheet 14 may be disposed not only after the absorbent member 13 is wrapped with the hydrophilic sheet but also directly on the absorbent member 13. Further, a liquid diffusion sheet for improving liquid diffusibility may be provided between the top sheet 14 and the hydrophilic sheet. Body fluid is more easily diffused by the sheet. The hydrophilic sheet may be attached so as to wrap the absorbent body 13, or may be disposed so as to overlap only the front and back surfaces without wrapping the end of the absorbent body 13.

In the above embodiment, the compressed rows 22 are formed by the concave portions 21 as continuous grooves, but the compressed rows 22 may be formed by discontinuous (for example, intermittent) grooves (see the following modification examples). The shape of the recess 21 is not limited to the shape shown in the present embodiment, and various shapes such as a quadrangle, a circle, an ellipse, and a triangle can be used.

The disposable diaper 10 of the above embodiment can be applied to both adults and children. In the above-described embodiment, the open-type diaper 10 (so-called sheet-type diaper) is described as an example, but it is needless to say that the present invention is also applicable to a pants-type diaper. The absorbent article of the present invention is not limited to diapers, and can be applied to all of various other general absorbent articles such as absorbent pads and urine leakage pads. For example, as shown in fig. 5, the present invention can be applied to an absorbent pad or the like, having the same operational effects as a diaper, depending on the configurations of the absorbent body 13 and the topsheet 14 portion.

In the above embodiment, only one side of the absorbent body 13 is embossed, but the present invention is not limited to this, and both sides may be embossed. That is, the concave portions 21 are formed on both the front and back surfaces of the absorber 13 by embossing from both the top sheet 14 side and the back sheet 12 side. Thus, the pressure is not concentrated on only a single surface of the front and back surfaces of the absorbent body 13, and therefore, even if it is not pressed deeply in the embossing process, the compressed lines 22 can be clearly formed, and the flexibility of the diaper 10 can be maintained.

In the above embodiment, the concave portions 21 are formed continuously, but in the present invention, the concave portions 21 may be formed discontinuously. Thereby, the shape of the low basis weight portion 23 (low basis weight pressing portion 13G) in the intersecting region 25 is also changed. Fig. 11 is a cross-sectional view taken along line X-X of fig. 6 according to a modification of the present invention. The same reference numerals as those in the above embodiment are given to those having the same functions among the respective elements constituting the diaper of this modification, and the description thereof is omitted.

In the present modification, the concave portion 21 is not formed in the portion corresponding to the intersection region 25 where the compressed rows 22 intersect. As shown in fig. 11, the low-basis weight portion 23 (low-basis weight pressing portion 13G) in the intersecting region 25 is not pressed, but slightly compressed by the pressing of the concave portion 21 in the periphery of the intersecting region 25, and slightly raised toward the skin contact side in cross section (see fig. 6 of the above-described embodiment). With this configuration, the density of the absorber 13 in the intersecting region 25 becomes lower than the density of the concave portion 21, and therefore the same effect as that of the above-described embodiment can be obtained.

In the above embodiment, the low basis weight portion 23 is bonded to the core sheet 15 as shown in fig. 3 or fig. 8, but may not be bonded in the present invention. With this arrangement, the absorbent body 13 may be compressed, so that the portions where the low-basis weight portions 23 are formed are not compressed (or are less likely to be compressed) when the recesses 21 are formed in the intersecting regions 25.

Description of the reference numerals

10 Disposable diaper

10A magic tape

10B front adhesive sheet

10F front body area

10R posterior segment region

10C crotch area

10W waist opening

10L leg opening

10D elastic sheet

11 cover sheet

11A, 13A notch part

12 bottom sheet (Back sheet)

13 absorbent body

14 Top sheet (front sheet)

15 core-spun sheet

16. 19 rubber thread

18 side sheet

21 concave part

21a Right concave part (concave part inclined to the 1 st direction)

21b left concave part (concave part inclined to the 2 nd direction)

22 compressed line

22a 1 st compressed line

22b 2 nd compression line

23 Low basis weight portion

24c low basis weight row

25 cross region

26 main absorbent region

S1 Forming intervals of multiple No. 1 compression lines

S2 Forming intervals of multiple No. 2 compression rows

Depth of D1 recess

Thickness of the main absorbent region D2

Thickness of diaper with D3 recess

Thickness of absorber having D4 concave portion

Diagonal line of L11 lattice

L2 adjacent low repeat rows 24 c.

Claims

1. An absorbent article comprising a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorbent body disposed between the topsheet and the backsheet,

a plurality of compression lines are arranged so as to intersect with each other, the compression lines being formed of a plurality of concave portions formed by compressing the topsheet and the absorbent member together,

a low basis weight portion having a lower basis weight than the surrounding is provided in all of the intersecting regions of the compressed rows and a part of the regions other than the compressed rows,

the absorbent body has, in a region other than the compressed rows, a portion in which the thickness of a first absorbent body portion overlapping with the low basis weight portion is equal to the thickness of a second absorbent body portion not overlapping with the low basis weight portion, and the density of the first absorbent body portion is lower than the density of the second absorbent body portion in the equal portion.

2. The absorbent article of claim 1,

the density of the absorbent body of the low basis weight portion in the intersecting region is lower than the density of the absorbent body of the region other than the low basis weight portion in which the compressed rows are formed.

3. The absorbent article of claim 1,

the density of the absorbent body of the low basis weight portion in the intersecting region is equal to or higher than the density of the absorbent body of the region other than the low basis weight portion in which the compressed rows are formed.

4. The absorbent article according to any one of claims 1 to 3, wherein,

the plurality of concave portions are formed by compressing the topsheet and the absorbent body on the topsheet side.

5. The absorbent article according to any one of claims 1 to 3, wherein,

the plurality of recesses are continuous grooves.

6. The absorbent article according to claim 4,

the plurality of recesses are continuous grooves.