TWI691315B - Absorbent article - Google Patents

Abstract

The present invention relates to an absorbent article, and an object of the present invention is to provide an absorbent article capable of dispersing body fluids such as discharged urine well in the longitudinal direction of the surface sheet and of the body fluids that have diffused in the longitudinal direction Absorption becomes good, and the aforementioned absorbent article has little back flow of body fluid.

In the absorbent article (1) of the present invention, the surface member (2) includes a central sheet member (21), and a pair of side sheet members (22), (23). The surface member (2) has The opposite side sheet members (22) and (23) overlap the pair of first repeating parts (A ₁ ) formed by the central sheet member (21) from the skin surface side, and the pair of first repeating parts (A ₁ ) Each has: a first bonding portion (B ₁ ) that joins the central sheet member (21) and the side sheet members (22), (23) and extends in the longitudinal direction (L); and along the first bonding portion (B ₁ ) The first free edge portions (22a) and (23a) of the side sheet members (22) and (23) protruding in the direction of the long axis (C).

Description

Absorbent article

The present invention relates to absorbent articles such as paper diapers and urine absorbent pads.

As an absorbent article such as a conventional paper diaper, urine absorbent pad, etc., an absorbent article disclosed in Patent Document 1 is composed of three or more sheets extending in the longitudinal direction to constitute the skin disposed on the absorbent core Inner sheet member on the face side. This absorbent article is an edge portion of a sheet material located on the outer side in the transverse direction, and an edge portion on the inner side in the aforementioned transverse direction overlaps from the skin surface side in the aforementioned transverse direction to the adjacent sheet material located on the inner side in the transverse direction. The outer side of the edge is composed.

The absorbent article disclosed in this Patent Document 1 is formed by using three or more sheets to constitute the inner sheet member, and the edges of each sheet form two or more steps extending in the longitudinal direction to promote The excreted urine spreads in the longitudinal direction.

In addition, Patent Document 2 discloses an absorbent article provided with a pair of right and left corrugated sheets provided at both ends in the width direction of a surface sheet, including a part of the surface sheet protruding The protrusion. In this absorbent article, the surface sheet is composed of a single sheet material that continues from one end to the other end in the width direction of the absorbent article, and the protruding portion is formed by partially folding this single sheet material.

The absorbent article disclosed in this Patent Document 2 is based on The above-mentioned pair of left and right protrusions are formed on the surface sheet, which can weaken the strength of the discharged body fluid and allow the body fluid to spread in the longitudinal direction.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Unexamined Patent Publication No. 2011-000279

[Patent Document 2] Japanese Patent Laid-Open No. 2004-351228

In an absorbent article in which an inner sheet member (surface sheet member) is composed of three or more sheets as in Patent Document 1, generally, each sheet is coated with a hot-melt adhesive (HMA) at a position where the sheets overlap each other ) For full-scale coating. However, when the sheet materials are joined by such a full-scale coating of HMA, even if body fluids such as urine that has been discharged reach the overlapping portion, the HMA at the joining portion becomes an obstacle to the inhalation of the body fluid. It is not easy to inhale the aforementioned body fluid.

In addition, as in the case of an absorbent article such as Patent Document 2, which partially folds the surface sheet to form a protruding portion, when urine or the like has been discharged When the fluid reaches the protruding portion, the protruding portion is formed by partially folding a surface sheet composed of a single sheet material, so that the body fluid may be sucked into the protruding portion from below the protruding portion If the side oozes in the width direction of the absorbent article, the body fluid may not easily spread in the longitudinal direction of the absorbent article. In addition, even if the body fluid sucked into the protruding portion does not ooze out from the underside of the protruding portion and remains inside the protruding portion, there may be a load due to pressure, etc., and the body fluid faces the skin surface side outside the protruding portion Outflow (ie, reflux).

The present invention relates to absorbent articles, the purpose of which is to provide An absorbent article capable of allowing body fluids such as discharged urine to diffuse well in the longitudinal direction on the surface sheet, and absorption of body fluids diffused in the longitudinal direction becomes good, and the backflow of the body fluid is less Absorbent articles.

The present invention is an absorbent article having a longitudinal direction and a width direction, and having a liquid-permeable surface member arranged on the skin surface side and an absorber arranged on the garment side of the surface member, characterized in that the surface member Comprising: a central sheet member arranged on the long axis of the absorbent article and extending in the longitudinal direction; and a central sheet member arranged on both sides of the longitudinal direction of the central sheet member and extending in the longitudinal direction of the absorbent article A pair of side sheet members, the surface member having a pair of first repeating parts, the pair of first repeating parts including by overlapping the pair of side sheet members from the skin surface side The repeating portion formed by the central sheet member extends in the longitudinal direction, and the pair of first repeating portions each have a first joint portion that joins the central sheet member and the side sheet member and extends in the longitudinal direction ; And the first free edge portion of the side sheet member that protrudes in the long axis direction along the first joint portion.

According to the present invention, the first free edge portion of the side sheet member can stand up to form an upright portion even when the absorbent article is unfolded, but it is easier to form the upright section when the absorbent article is bent inward in the longitudinal direction With such a standing portion, the discharged body fluid can be diffused well in the longitudinal direction on the surface sheet, and the absorption of the body fluid diffused in the longitudinal direction becomes good, and the backflow of the body fluid can be reduced .

1‧‧‧absorbent articles

2‧‧‧Surface components

21‧‧‧Central sheet member

21a‧‧‧The second free edge

21b‧‧‧The second free edge

22‧‧‧One side sheet member

22a‧‧‧The first free edge

23‧‧‧The other side sheet member

23a‧‧‧The first free edge

3‧‧‧Absorber

31‧‧‧The first absorbent core

32‧‧‧The second absorbent core material

4‧‧‧Back member

5‧‧‧ Wrinkle forming member

5a‧‧‧The wrinkle on one side forms a thin sheet

5b‧‧‧The wrinkle on the other side forms a thin sheet

51‧‧‧Elastomer

6‧‧‧ Adhesive

A ₁ ‧‧‧ Repeating part 1

A ₂ ‧‧‧ Repeating part 2

B ₁ ‧‧‧ First joint

B ₂ ‧‧‧ 2nd junction

C‧‧‧Long axis of absorbent articles

G‧‧‧ Three-dimensional wrinkle

L‧‧‧Long

W‧‧‧Width direction

Fig. 1 is a plan view of an absorbent article according to an embodiment of the present invention after being unfolded.

Fig. 2 is a cross-sectional view taken along line XX' of the absorbent article of Fig. 1.

3 is a partial perspective view of the vicinity of the first repeating portion of an absorbent article according to an embodiment of the present invention.

Figure 4 is the first embodiment of the present invention along the first absorbent article Partial perspective view in the width direction near the repeating part.

FIG. 5 is a schematic diagram showing the function of the second free edge of the central sheet member.

6 is a cross-sectional view of an absorbent article according to another embodiment of the present invention (an embodiment in which each side sheet member is composed of two sheets of sheet material).

Hereinafter, an ideal embodiment of the absorbent article of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view (expanded plan view) of an absorbent article 1 according to an embodiment of the present invention after being developed, and FIG. 2 is a cross-sectional view taken along line XX′ of FIG. 1. This absorbent article 1 has a planar viewing angle in the unfolded state, and has a long shape in the longitudinal direction L, and has the abdominal region 11, the crotch region 12, and the back region 13 along the longitudinal direction L. Here, the abdomen-side region 11 and the back-side region 13 are regions corresponding to the wearer's waist front part (abdomen) and waist back part (buttocks), respectively, and the sub-crotch region 12 is located on the belly side region 11 The area corresponding to the aforementioned back side area 13 and corresponding to the wearer's crotch portion.

In addition, the plan view of the absorbent article 1 in the unfolded state has a belt-shaped central region 14 that includes the long axis C of the absorbent article 1 and extends over the entire length of the longitudinal direction L of the absorbent article 1; and is located in the absorbent article 1 in the width direction W of the aforementioned central region 14 The side becomes the side regions 15, 16 of the remaining region other than the aforementioned central region 14. In addition, the width direction W of the absorbent article 1 refers to a direction perpendicular to the longitudinal direction L of the absorbent article 1 when the absorbent article 1 is unfolded.

The aforementioned central area 14 is an area where body fluids such as discharged urine can diffuse, and the length in the width direction W (that is, the width of the central area 14) can be adapted to the shape and size of the person to whom the absorbent article 1 is applied They are appropriately selected, but generally have a length of 1/3 or more of the total length of the absorbent article 1 in the width direction W.

The external shape of the absorbent article 1 is not particularly limited as long as it is elongated in a planar view when viewed from a plane, and it may be a gourd shape as shown in FIG. 1, or a rectangular shape or an oval shape such as a rectangle , Oval and other shapes other than gourd.

In addition, as shown in FIGS. 1 and 2, the absorbent article 1 has a laminated structure including a surface member 2, an absorber 3, a back member 4 and a wrinkle forming member 5.

The surface member 2 is a liquid-permeable sheet member that is arranged on the skin surface side in the thickness direction of the absorbent article 1 and can directly contact the skin surface of the wearer. In this embodiment, the surface member 2 includes a central sheet member 21 disposed on the long axis C of the absorbent article 1 and formed to be longer in the longitudinal direction L; and a longitudinal direction L disposed in the central sheet member 21 A pair of side sheet members 22, 23 are formed on both sides of the two, and are longer in the aforementioned longitudinal direction L.

If the central sheet member 21 is a liquid-permeable sheet member It is not particularly limited, and any sheet member can be used. Examples of the center sheet member of the present invention include nonwoven fabrics and woven fabrics, and it is preferable to use nonwoven fabrics from the viewpoint of cushioning properties, skin feel, and versatility. As the nonwoven fabric, any nonwoven fabric commonly used in this technical field, such as hot air nonwoven fabric, water needle nonwoven fabric, spunbond nonwoven fabric, heat fusion nonwoven fabric, meltblown nonwoven fabric, and needle punched nonwoven fabric, can be used.

The basis weight of the center sheet member 21 is not particularly limited, and any basis weight may be adopted. The basis weight of the central sheet member of the present invention is preferably 10 g/m ² to 100 g/m ² , and more preferably 20 g/m ² to 50 g/m ² . When the basis weight is less than 10g/m ² , sufficient surface strength cannot be obtained, and there is a risk of damage during use, and when it exceeds 100g/m ² , excessive stiffness may occur, causing wearer to cause Uncomfortable feelings, foreign body feelings, etc. arise.

The structure of the central sheet member 21 is not particularly limited if it is sheet-shaped Restrictions may apply to sheet members having any thickness and any surface structure. The thickness of the central sheet member of the present invention is, for example, from the viewpoint of moderate liquid permeability, cushioning properties, skin feel, etc., for example, in the range of 0.001 mm to 5.0 mm, preferably 0.01 mm to 3.0 mm, more preferably 0.1 mm ~1.0mm. The center sheet member of the present invention preferably has a structure in which a plurality of convex portions are formed at least on the surface on the skin surface side. When the center sheet member has such a structure, when the center sheet member and the side sheet member are joined, the joining portion of the center sheet member is crushed by the looseness of the convex portion at the joining portion of the center sheet member, In addition, in the region closer to the long axis side than the joining portion, the convex portion is in a state of high bulkiness, so the free edge portion extending in the longitudinal direction of the side sheet member becomes Easy to stand up. It is not particularly limited if the convex portion can exert such a function, and any structure can be adopted. For example, it may be a raised portion (convex portion) extending in the longitudinal direction, or it may be a ridge with a circular arc Flat rectangular parallelepipeds or truncated quadrangular pyramids, pyramids with rounded vertices (for example, triangular pyramids, quadrangular pyramids, etc.), cones with rounded vertices, arches, etc. In addition, the structure of the portion other than the convex portion is not particularly limited, and may be a groove portion or a flat portion. For example, the convex portion may be formed as a plurality of raised portions extending in the longitudinal direction, and the convex portion The other part is used as a back ridge groove structure formed by a plurality of grooves extending in the longitudinal direction. In addition, as the center sheet member of the present invention, a member having one or a plurality of grooves extending in the longitudinal direction at least on the surface of the skin surface side can be used. When the central sheet member has such a structure, it can promote the diffusion of body fluids such as discharged urine in the longitudinal direction, and can improve cushioning properties, skin feel, and the like.

Moreover, the center sheet member of this invention is arrange|positioned in an absorbent material The product is preferably in the aforementioned central area. When the central sheet member is disposed in the central region, body fluids such as urine that has been discharged are easily introduced through the central sheet member to the clothing side (that is, the wearer's skin side) disposed on the surface member (The opposite side) of the absorbent body in the central region, as a result, the body fluid becomes less likely to reach the end of the absorbent article in the width direction W, so that the leakage of body fluid from the absorbent article in the width direction W can be reduced ( (That is, side leakage).

In this embodiment, the side sheet members 22 and 23 are not particularly limited as long as they are liquid-permeable sheet members, and the same sheet member as the center sheet member 21 can be used. An ideal sheet member as the side sheet member of the present invention is, for example, a non-woven fabric having a basis weight of 10 g/m ² to 30 g/m ² . However, as will be described later, since the end edge of the side sheet member in the width direction W on the long axis side becomes a free edge portion, the free edge portion stands up to form an upright portion, so it is necessary to consider the longitudinal direction L of the discharged body fluid Choose the basis weight, thickness, structure, material, etc. of the diffusibility of the wearer and the skin feel of the wearer.

In addition, in this embodiment, the The liquid permeability of the center sheet member 21 in the center region 14 is preferably higher than that of the side sheet members 22 and 23. In the present invention, when the liquid permeability of the center sheet member is higher than that of the side sheet members, the body fluid blocking and stopping effect of the rising portion formed by the first free edge portion described later can be increased, and therefore, the arrangement is promoted to The absorption of body fluid by the absorber in the central region on the garment side of the surface member can more effectively prevent the lateral leakage of the body fluid.

In the present invention, the absorption system is arranged on the clothing of the surface member On the side, it absorbs body fluids such as urine and water contained in feces that have passed through the surface member. In this embodiment, the absorber 3 has a double-layer structure, and includes a first absorbent core 31 forming a layer on the skin surface side and a second absorbent core 32 forming a layer on the clothing side.

These absorbent cores 31 and 32 are not particularly limited as long as they have a function of absorbing and holding body fluids such as discharged urine, and any absorption that has been adopted in conventional paper diapers and the like can be used. Elements. In general, when considering water absorption, installation comfort, etc., the absorbent core material is preferably a core material that has a high bulkiness, is less prone to shape collapse, and has less chemical irritation. Examples of the absorbent core material of the present invention include fiber-based materials including fluff pulp, spunbonded nonwoven fabric, airlaid nonwoven fabric, thermoplastic fibers, etc., which are covered with a cable core composed of a liquid-permeable sheet and wrapped Absorbent core material elements of high-absorbent polymers (SAP) and other polymer absorbents. In addition, the absorbent core material element may not include a superabsorbent polymer, and for example, a core material may be used as the absorbent core material by covering only the fiber-based material with the core material. In addition, examples of the core wrapping layer include tissue paper having a basis weight of about 10 to about 30 g/m ² , liquid-permeable nonwoven fabrics, and liquid-permeable sheets such as hydrophilic nonwoven fabrics.

The structure of the aforementioned absorbent cores 31 and 32 is not particularly limited, Any constructor can be used. The absorbent core of the present invention may have the same structure as each other or different structures. In the case where these absorbent core materials have different structures, one of the absorbent core materials is disposed in a region corresponding to the aforementioned central sheet member of the absorbent article when viewed from the plane when the absorbent article is unfolded And, it is preferable to form the other absorbent core material longer (that is, wider in width) than one of the aforementioned absorbent core materials in the width direction. With such a structure, the thickness of the portion of the absorber corresponding to the central sheet member becomes thicker, and the basis weight of this portion becomes larger than that of other portions. Therefore, the absorption capacity of the absorber can be concentrated on The part corresponding to the aforementioned central sheet member of the aforementioned absorbent article. As a result, the absorption amount of body fluid in the portion of the absorber corresponding to the central sheet member increases, so that the lateral leakage of the body fluid is reduced, and therefore, the contamination area caused by the body fluid can be reduced.

In addition, from the viewpoint of preventing lateral leakage of body fluids, etc., as shown in FIG. 1, in the plane viewing angle of the state where the absorbent article 1 is unfolded, the above-mentioned first absorbent core material and second absorbent core material At least one of the absorbent core materials is formed in a gourd shape.

Furthermore, in this embodiment, the absorber 3 has a double-layer structure formed by two absorbent cores 31, 32, but the absorbent article of the present invention is not limited to this structure, and may have, for example, one absorbent core. The single-layer structure of the material may also have a multilayer structure formed by stacking three or more absorbent core materials. Even in the case of having such a single-layer structure or a multi-layer structure, in the same way as the aforementioned double-layer structure, in order to make the basis weight of the portion of the absorber corresponding to the central sheet member heavier than that of other portions, the absorbent core material The thickness and/or the number of layers of the portion corresponding to the aforementioned central sheet member is preferably larger than the thickness and/or the number of layers of other portions.

In this embodiment, the back member 4 is a liquid-impermeable sheet disposed on the garment side of the absorber 3. The liquid-impermeable sheet constituting the back member of the present invention is not particularly limited as long as it is liquid-impermeable to body fluids such as urine, and can be used conventionally as a liquid-impermeable sheet such as a paper diaper. Any sheet material. This liquid-impermeable sheet is preferably not only liquid-impermeable to body fluids such as urine but also has air permeability. Examples of such liquid-impermeable sheets include liquid-impermeable synthetic resin films such as polyethylene having a basis weight of about 15 to about 25 g/m ² and a basis weight of about 10 to about 30 g/m. ^2. Non-woven fabrics such as SMS non-woven fabrics and non-woven fabrics made of water-repellent synthetic fibers, and laminated sheets of liquid-impermeable synthetic resin films.

In the present embodiment, the wrinkle-forming member 5 has two side portions arranged in the width direction W on the skin surface side of the surface member 2 and forms a pair of wrinkle-forming sheets that is long in the longitudinal direction L of the absorbent article 1 5a, 5b; and an elastic body 51 such as a rubber thread disposed in a space formed by folding back the ends of the wrinkle forming sheets 5a, 5b on the long axis C side. The wrinkle forming member is configured to raise the end of the wrinkle forming sheet on the long axis side by the contraction force of the elastic body when the absorbent article is bent inward to form a three-dimensional wrinkle G. By the three-dimensional wrinkle G, it is possible to more effectively prevent the excretion of excreted urine and feces from the absorbent article.

The wrinkle-forming sheets 5a and 5b are not particularly limited as long as they are hydrophobic or liquid-impermeable, and any of the conventional wrinkle-forming sheets used in paper diapers and the like can be used. Sheet material. Examples of the hydrophobic or liquid-impermeable sheet material constituting the wrinkle-forming sheet of the present invention include, for example, spunbond nonwoven fabrics with a basis weight of about 10 to about 40 g/m ² , point bonded nonwoven fabrics, SMS nonwoven fabrics, Liquid-impermeable synthetic resin films and laminates of these materials.

Hereinafter, the structure of the surface member 2 of the absorbent article 1 of this embodiment will be described in further detail.

As shown in FIGS. 1 and 2, in the absorbent article 1 of the present invention, the center sheet member 21 is on both sides of the center sheet member 21 in the longitudinal direction L, and the pair of side sheet members 22 and 23 are long. Each side portion on the axis C side overlaps from the skin surface side. Moreover, the respective first repeating portions A ₁ of the central sheet member 21 and the side sheet members 22, 23 overlap each other so as to be on the end edge side of each side portion of the side sheet members 22, 23 on the long axis C side The first free edge portions 22a and 23a are formed, and are joined to each other at positions separated from the end edges of the aforementioned side portions.

3 is a perspective view of a portion of the absorbent article 1 near the first repeating portion A ₁ near E ₁ , FIG. 4 is a portion of the absorbent article ₁ near the first repeating portion A ₁ near the width direction W of the E ₂ Face map. As shown in FIGS. 3 and 4, each of the first free edge portions 22 a and 23 a is inclined toward the long axis C side of the absorbent article 1 when the absorbent article 1 is bent inward in the longitudinal direction L, etc. Standing up to form a standing part. In addition, this standing portion blocks the body fluid flowing in the width direction W on the skin surface side of the surface member 2 when body fluids such as urine have been discharged, so the width from the absorbent article 1 can be effectively prevented Liquid leakage in direction W (that is, lateral leakage).

In addition, since the base portion of the standing portion, the first bonding portion B _{1 of} the center sheet member 21 and the side sheet members 22, 23 is formed along the longitudinal direction L of the absorbent article 1, it is possible this fluid is discharged along the first joining B ₁ in the longitudinal direction L diffusion. Furthermore, since the standing portion is used as the boundary, the long axis C side of the surface member 2 and the long axis C side are discontinuous. Therefore, the diffusion of the body fluid in the width direction W is suppressed by the discontinuous portion. As a result, The diffusion of the aforementioned body fluid in the longitudinal direction L can be further promoted. In addition, when the body fluid diffuses in the longitudinal direction L, the body fluid can be absorbed using a wide range of surfaces of the absorber 3 disposed on the clothing side of the surface member 2, so the body fluid can be greatly raised toward the absorber 3. Absorption speed.

Also, formed by the first free edge portions 22a, 23a The standing portion is composed of one piece of side sheet members 22, 23 (ideally, the side sheet members 22, 23 made of non-woven fabric), therefore, it is possible to suppress the body fluid from remaining in the standing portion, and to reduce the adhesion of body fluid to the wearer As a result, the skin of the user can keep the skin of the wearer clean.

The length W _{F of the} first free edge portions 22a, 23a in the width direction W is not particularly limited as long as the first free edge portions 22a, 23a can exert the aforementioned functions, and may have any width. For example, from the viewpoint of the blocking stop effect of the discharged body fluid, the wearer's sense of wearing, etc., the W _F of the width direction W of the first free edge of the present invention is in the range of 1 mm to 20 mm , Ideally within the range of 3mm ~ 15mm, more ideally within the range of 4mm ~ 10mm.

The length W _F of the first free edge in the width direction W is preferably constant over the entire length of the absorbent article in the longitudinal direction L. When the length W _{F of the} first free edge portion in the width direction W is constant over the entire length of the absorbent article in the longitudinal direction L, when the discharged body fluid flows on the surface of the surface member on the skin side, use The rising portion formed with the first free edge portion of a certain width can stop and stop the body fluid equally at any position in the longitudinal direction L of the absorbent article, so stable cross leakage prevention can be achieved Features.

In the present invention, the length W _F of the width direction W of the first free edge portion and the shape of the standing portion can be adjusted by the shape of the first joining portion of the first repeating portion of the central sheet member and the side sheet member, etc. . For example, the first joint portion is a plane view angle in a state where the absorbent article is unfolded, and may be linear along the longitudinal direction L. When the first joint portion is linear, since the base of the standing portion formed by the first free edge portion becomes linear, when the body fluid that has been discharged is on the surface of the surface member on the skin side When flowing upward, the body fluid is blocked in a straight line and stopped, and the body fluid can be stopped at the same position in the width direction W in the longitudinal direction L of the absorbent article, and the lateral leakage of the body fluid can be more effectively suppressed. In addition, the linear first joint portion also has the advantage that the body fluid blocked and stopped by the joint portion can easily spread smoothly in the longitudinal direction L.

In addition, the first joining portion may be used as an absorbent The plane viewing angle of the unfolded state of the product is non-linear along the longitudinal direction L such as a wavy shape or a shape with a spiral projected on a plane. When the first joining portion is made non-linear, since the base of the rising portion formed by the first free edge portion is non-linear, the discharged body fluid flows on the surface of the surface member on the skin side When going up, the position in the width direction W where the body fluid is blocked can be made different along the longitudinal direction L of the absorbent article. Therefore, the spread of the body fluid in the width direction W can be suppressed, and the surface member can be used The wide surface of the absorbent body on the garment side efficiently absorbs the aforementioned body fluids. In addition, since the first non-linear first joining portion is formed when the first free edge portion is raised, it is easy to form a wrinkled portion in the raised portion, and therefore, it is possible to improve cushioning properties, skin feel, and the like.

The length W _{B of the} first joining portion B _{1 in} the width direction W is not particularly limited, and can be any width. In the present invention, the length W _B of the first joining portion in the width direction W is, for example, in the range of 1 mm to 10 mm, preferably in the range of 1.5 mm to 6 mm, and more preferably in the range of 2 mm to 4 mm. In addition, from the viewpoint of the blocking stop effect of the discharged body fluid, the bonding strength, the ease of aspiration of the body fluid, etc., the width W _{F of the} first free edge portion and the width of the first bonding portion The ratio of the length W _B of the direction W (W _F /W _B ) is preferably 5/3 or more.

In the present invention, the first joint portion and the second joint to be described later are formed The joining means of the joint is not particularly limited, and any means known in this technical field can be used, and examples thereof include hot melt adhesives such as adhesives using hot melt adhesives (HMA) and hot embossing. From the standpoints of the effect of stopping the discharged body fluid, the excellent bonding strength, and the like, the bonding means of the first bonding portion and the second bonding portion is preferably using an adhesive, and particularly preferably using HMA.

The surface member of the present invention is as described above and can be applied to the conventional It can be manufactured by any means known from the past, for example, it can be applied along the longitudinal direction L by a portion separated from the edge of each of the side portions on the upper surface of each side portion of the central sheet member in the longitudinal direction L Adhesives such as HMA are manufactured by superimposing the side portions of the pair of side sheet members on the long axis C side on the applied adhesive and joining them. In addition, the absorbent article of the present invention can be manufactured by any manufacturing process conventionally known in addition to the manufacturing process of the aforementioned surface member. Therefore, it does not require special manufacturing equipment and complicated manufacturing processes, and can be easily performed manufacture.

In addition, in this embodiment, as shown in FIGS. 2 and 4, the central sheet member 21 is formed with a second free edge portion on each end edge side of both side portions in the longitudinal direction L in the first repeating portion A ₁ . 21a and 21b are joined to the side sheet members 22 and 23 at a position separated from the edges of the two side portions. FIG. 5 is a schematic diagram showing the function of the second free edge of the central sheet member. As shown in FIG. 5, when the second free edge portions 21 a and 21 b are formed on the end edges of both sides of the longitudinal direction L of the central sheet member 21, body fluid U such as discharged urine passes through the surface member 2 and is After absorption by the absorber 3, even if the body fluid U′ absorbed by the absorber 3 oozes toward the surface member 2 due to pressure load, exceeding the absorption capacity of the absorber 3, etc., the central sheet member 21 The second free edge portions 21a, 21b on both sides of the longitudinal direction L of the body suppress the outflow of the body fluid U′ toward the skin surface side of the surface member 2 (so-called backflow), and therefore can prevent the body fluid U′ from adhering to the wearer As a result, the skin surface of the wearer can keep the wearer's skin clean.

The length W _F′ of the second free edge portions 21 a and 21 b in the width direction W is such that the second free edge portions 21 a and 21 b can exert the aforementioned functions, and is not particularly limited, and can be any length. For example, the length W _F'of the width direction W of the second free edge of the present invention is in the range of 1 mm to 20 mm, which is approximately the same as the length W _F of the width direction W of the first free edge, preferably 3 mm to 15 mm Within the range of 4mm~10mm. In addition, from the viewpoint of the effect of suppressing the backflow of body fluid that has been absorbed by the absorbent body, the bonding strength, etc., the length W _F′ of the width direction W of the second free edge portion and the width direction W of the first bonding portion The ratio of the length W _B (W _F' /W _B ) is preferably 5/3 or more.

Furthermore, in this embodiment, the surface member 2 is composed of one piece The total of the central sheet member 21 and the two side sheet members 22, 23 3 The sheet member is composed of sheets, but the present invention is not limited to such a structure, and the surface member may be constituted by four or more sheet members.

FIG. 6 is a cross-sectional view of an absorbent article according to another embodiment of the present invention composed of two sheet members 221, 222, 231, and 232, each of which is composed of two sheet members 221, 222, 231, and 232. As shown in FIG. 6, each of the side sheet members 22 and 23 may be formed by arranging four sheets of sheets 221, 222, 231 and 232 in the width direction W in the longitudinal direction L of the absorbent article 1. . In such an embodiment, of the four sheets of sheets 221, 222, 231, and 232, the two sheets of sheets 221, 231 located on the long axis C side of the absorbent article 1 are on the opposite side to the long axis C side. For each side portion, the side portions of the other two sheets 222, 232 adjacent to the opposite side of the long axis C side on the long axis C side are overlapped from the skin surface side. In addition, the second repeating portion A _{2 where the two} sheets 221 and 231 located on the long axis C side overlap with the other two sheets 222 and 232 adjacent to the opposite side of the long axis C is for The third free edge portions 222a, 232a are formed on the end edges of the side portions of the two sheets 222, 232 adjacent to the opposite side of the long axis C side, and are separated from the end edges of the side portions Join each other.

In addition, from the viewpoint of the blocking effect or bonding strength of the discharged body fluid, the ease of inhalation of the body fluid, etc., in the second repeating portion A ₂ , the length of the third free edge in the width direction W is equal to the second The ratio of the length of the joining portion in the width direction W is preferably 5/3 or more.

When the surface member is composed of a plurality of sheets When each side sheet member is on the surface of the surface member on the skin side Since the free edge portion extending along the longitudinal direction L of the absorbent article is formed in a plurality of steps in the width direction W, the flow of the discharged body fluid in the width direction W can be more reliably blocked, It can effectively prevent the aforementioned lateral leakage of body fluid.

In addition, as shown in FIG. 6, of the four sheets 221, 222, 231, and 232, the two sheets 221, 231 located on the long axis C side are adjacent to the long axis C side. The second repeating portion A ₂ of the other two sheets 222, 232 on the opposite side, in order to form the fourth free edge portions 221b, 231b on the end edges of the side portions opposite to the long axis C side, The parts separated from the edges of the aforementioned side portions are joined to each other.

In addition, from the viewpoint of the backflow suppression effect of the body fluid that has been absorbed by the absorbent body, the bonding strength, and the like, in the second repeating portion A ₂ , the length in the width direction W of the fourth free edge portion is the width of the second bonding portion The ratio of the length of the direction W is preferably 5/3 or more.

When two of the thin sheets on the long axis C side When each end edge side opposite to the long axis C side also forms a free edge portion, the free edge portion can more effectively suppress the backflow of the body fluid that has been absorbed by the absorbent body, and can more reliably prevent the body fluid Attaches to the wearer's skin.

Also, the absorbent article of the present invention is not limited to the aforementioned embodiment The state and the like can be appropriately combined, modified, etc. within the scope of the purpose and technical idea of the present invention.

The present invention is, for example, applicable to disposable paper urine Various absorbent articles such as cloths, urine absorbent pads, sanitary napkins, etc., but are particularly suitable for absorbent articles such as paper diapers and urine absorbent pads that are required to absorb a large amount of body fluids.

In the following, an exemplary embodiment of the present invention will be exemplified.

An embodiment of the present invention is an absorbent article having a longitudinal direction and a width direction, and having a liquid-permeable surface member arranged on the skin surface side and an absorbent body arranged on the garment side of the surface member, characterized in that : The surface member includes: a central sheet member disposed on the long axis of the absorbent article and extending in the longitudinal direction; and disposed on both sides of the central sheet member in the longitudinal direction and facing the absorbent article A pair of side sheet members extending in the longitudinal direction of the pair, the surface member having a pair of first repeating parts including the pair of first sheet members overlapping the center by overlapping the pair of side sheet members from the skin surface side A repeating portion formed by the sheet member and extending in the longitudinal direction, and the pair of first repeating portions each include: a first joining portion that joins the central sheet member and the side sheet member and extends in the longitudinal direction; and The first free edge portion of the side sheet member that protrudes in the long axis direction along the first joint portion.

Furthermore, in another embodiment of the present invention, the pair of first repeating portions each have a second free edge portion of the center sheet member that protrudes in a direction opposite to the long axis direction along the first joint portion.

And in another embodiment of the present invention, the first The free edge portion has a length in the width direction of 5/3 or more of the length in the width direction of the first joint portion.

Moreover, in still another embodiment of the present invention, the aforementioned one Each of the first repeating portions has a second free edge portion of the central sheet member that protrudes in a direction opposite to the long axis direction along the first joint portion, and the second free edge portion has the first joint portion The length in the width direction is 5/3 or more of the length in the width direction.

Furthermore, in still another embodiment of the present invention, the side sheet member includes a plurality of sheets extending in the longitudinal direction and arranged in the width direction, and the side sheet member has a second repeating portion, the second The repeating portion is a repeating portion extending in the longitudinal direction and formed by overlapping the sheet on the long axis side from the absorber side to another sheet adjacent to the side opposite to the long axis side. The second repeating portion includes: a second joining portion that joins the sheet material and the other sheet material and extends in the longitudinal direction; and the other sheet material that protrudes in the long axis direction along the second joining portion The third free edge.

In still another embodiment of the present invention, the first free edge portion has a certain length in the width direction over the entire length of the longitudinal direction.

Furthermore, in still another embodiment of the present invention, in the absorber, the basis weight of the region corresponding to the central sheet member is greater than the basis weight of the other regions.

Furthermore, in another embodiment of the present invention, in the foregoing In the absorber, the thickness of the area corresponding to the aforementioned central sheet member is larger than the thickness of other areas.

Furthermore, in still another embodiment of the present invention, the absorbent body includes a single-layer or multi-layer absorbent core material, and the thickness and/or number of layers of the absorbent core material in the region corresponding to the central sheet member is higher than that of the foregoing The area is large.

Furthermore, in still another embodiment of the present invention, the first joint portion is formed by a hot-melt adhesive applied linearly.

Furthermore, in still another embodiment of the present invention, the first joint portion is formed by a hot-melt adhesive applied in a non-linear manner.

Moreover, in still another embodiment of the present invention, the first joint portion is formed by applying a hot-melt adhesive applied in a non-linear shape, the non-linear shape is a wave shape or a shape in which a spiral is projected on a plane .

Furthermore, in still another embodiment of the present invention, the liquid permeability of the center sheet member is higher than the liquid permeability of the side sheet member.

Furthermore, in still another embodiment of the present invention, the central sheet member has a structure in which a plurality of convex portions are formed at least on the surface on the skin surface side.

1‧‧‧absorbent articles

2‧‧‧Surface components

21‧‧‧Central sheet member

21a‧‧‧The second free edge

21b‧‧‧The second free edge

22‧‧‧One side sheet member

22a‧‧‧The first free edge

23‧‧‧The other side sheet member

23a‧‧‧The first free edge

3‧‧‧Absorber

31‧‧‧The first absorbent core

32‧‧‧The second absorbent core material

5‧‧‧ Wrinkle forming member

5a‧‧‧The wrinkle on one side forms a thin sheet

5b‧‧‧The wrinkle on the other side forms a thin sheet

6‧‧‧ Adhesive

A ₁ ‧‧‧ Repeating part 1

C‧‧‧Long axis of absorbent articles

G‧‧‧ Three-dimensional wrinkle

L‧‧‧Long

W‧‧‧Width direction

11‧‧‧ Abdominal area

12‧‧‧Crotch area

13‧‧‧ Back side area

14‧‧‧ Ribbon central area

15, 16‧‧‧ Side area

E ₁ ‧‧‧ near the first repeating part A ₁

Claims (13)

An absorbent article having a longitudinal direction and a width direction and having a liquid-permeable surface member arranged on the skin surface side and an absorber arranged on the garment side of the surface member, characterized in that the surface member is provided with: A pair of central sheet members extending on the long axis of the absorbent article and extending in the longitudinal direction; and a pair disposed on both sides of the central sheet member in the longitudinal direction and extending in the longitudinal direction of the absorbent article A side sheet member, the surface member having a pair of first repeating portions including a repeating portion formed by overlapping the pair of side sheet members on the center sheet member from the skin surface side And extending in the longitudinal direction, the pair of first repeating portions each include: a first joining portion that joins the central sheet member and the side sheet member and extends in the longitudinal direction; and along the first joining portion In addition, the first free edge portion of the side sheet member protruding toward the long axis direction, the first free edge portion has a width direction length of 5/3 or more of the width direction length of the first joint portion. An absorbent article as claimed in item 1 of the patent application, wherein the pair of first repeating portions each have a second freedom of the central sheet member protruding in a direction opposite to the long axis direction along the first joining portion Margin. An absorbent article as claimed in item 2 of the patent application, wherein the second free edge portion has a length in the width direction of the first joint portion The length in the width direction of 5/3 or more. An absorbent article according to item 1 of the patent application, wherein the side sheet member includes a plurality of sheets extending in the longitudinal direction and arranged in the width direction, and the side sheet member has a second repeating portion, which The second repeating portion extends in the longitudinal direction and includes a repeating portion formed by overlapping the sheet material located on the long axis side from the absorber side to another sheet material adjacent to the side opposite to the long axis side , The second repeating portion has: a second joining portion that joins the sheet and the other sheet and extends in the longitudinal direction; and the other sheet that protrudes in the long axis direction along the second joining portion The third free edge of the material. An absorbent article according to item 1 of the patent application, wherein the first free edge has a certain length in the width direction over the entire length of the longitudinal direction. In the absorbent article according to item 1 of the patent application, in the absorbent body, the basis weight of the region corresponding to the central sheet member is greater than the basis weight of other regions. An absorbent article as claimed in item 6 of the patent application, wherein in the absorbent body, the area corresponding to the central sheet member is thicker than the other areas. An absorbent article as claimed in item 6 or 7 of the patent application, wherein the absorbent body includes a single-layer or multi-layer absorbent core, and the thickness and/or number of layers of the absorbent core in the region corresponding to the central sheet member It is larger than the other areas mentioned above. An absorbent article as claimed in item 1 of the patent application, wherein the first joint portion is formed by a hot-melt adhesive applied linearly. An absorbent article as claimed in item 1 of the patent application, wherein the first joining portion is formed by applying a non-linear hot-melt adhesive. For example, in the absorbent article of claim 10, the aforementioned non-linear shape is a wave shape or a shape in which a spiral is projected on a plane. According to the absorbent article of claim 1, the liquid permeability of the center sheet member is higher than the liquid permeability of the side sheet members. An absorbent article as claimed in item 1 of the patent application, wherein the central sheet member has a structure in which a plurality of convex portions are formed at least on the surface on the skin surface side.

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