JP6922249B2 - Absorbent article - Google Patents

Description

The present invention relates to absorbent articles.

Absorbent articles such as sanitary napkins and disposable diapers absorb excrement such as urine by the absorber. In a general absorbent article, an absorber composed of absorbent fibers and a super absorbent polymer (SAP) is provided between a liquid-permeable top sheet and a liquid-impermeable back sheet. There is. Such an absorbent article has a configuration in which the skin-facing surface of the absorber is covered with a top sheet and the skin-non-facing surface of the absorber is covered with a back sheet. Therefore, the liquid such as urine excreted by the wearer permeates the top sheet, is absorbed by the absorber, and is retained. Further, the liquid held in the absorber is prevented from leaking to the outside by a liquid-impermeable back sheet arranged on the back surface side of the absorber.

An absorber in an absorbent article is a member that is susceptible to the movement of the wearer's body. Therefore, depending on how the wearer moves, the absorber may be twisted or broken, and the excrement fluid may leak. Further, since the absorber is a member having high rigidity among the members constituting the absorbent article, when the wearer wears the absorbent article, he / she may feel a sense of discomfort due to the rigidity of the absorber. For this reason, in absorbent articles, studies have been made to prevent leakage of excrement liquid and improve the wearing feeling of the wearer.

For example, Patent Document 1 discloses a disposable diaper in which three bent portions are formed along the length direction of the absorber. In such a disposable diaper, the peripheral portion of each slit is bent at the time of wearing, and the peripheral portion of the central slit becomes convex toward the excretion port of the wearer. Further, the portion around the slit on the side is convex on the opposite side to the portion around the slit in the center. That is, the cross-sectional shape of the absorber along the width direction of the absorber is deformed into a W shape. As described above, it has been studied that the shape of the absorber is deformed when the absorbent article is worn to prevent the excrement liquid from leaking and to further improve the wearing feeling.

Japanese Patent No. 5486348

However, in the disposable diaper of Patent Document 1, although the absorber bends along the three bent portions, the member arranged on the non-skin facing surface side of the absorber stretches in the direction of restoring the bent shape. Therefore, it has been clarified by the studies by the present inventors that it is difficult to maintain the bent shape.

Therefore, in order to solve the problems of the prior art, the present inventors have proceeded with studies for the purpose of providing an absorbent article that can easily form a bent shape and easily maintain the formed bent shape. rice field.

As a result of diligent studies to solve the above problems, the present inventors have obtained an absorber, a core wrap sheet laminated on at least a non-skin facing surface of the absorber, and a sheet-shaped skin facing surface side member. In an absorbent article comprising a sheet-like non-skin facing surface side member, a cut portion is formed along the longitudinal direction of the core wrap sheet, and a pair of bent grooves are formed along the longitudinal direction of the absorber. However, it has been found that by superimposing at least a part of the cut portion on the non-skin facing surface side of the bending groove, an absorbent article that can easily form a bent shape and easily maintain the formed bent shape can be obtained. rice field.
Specifically, the present invention has the following configuration.

[1] It has a longitudinal direction and a width direction orthogonal to the longitudinal direction.
Absorber and
A core wrap sheet that is laminated to at least the non-skin facing surface of the absorber,
A sheet-shaped skin-facing surface side member located on the skin-facing surface side of the absorber,
A sheet-like non-skin facing surface side member located on the non-skin facing surface side of the core wrap sheet is provided.
The core wrap sheet laminated on the non-skin facing surface of the absorber has a cut portion along the longitudinal direction and has a cut portion.
The absorber has a pair of bend grooves along the longitudinal direction.
At least a part of the cut portion is an absorbent article superimposed on the skin non-opposing surface side of the bending groove.
[2] The absorbent article according to [1], wherein the core wrap sheet is directly laminated on at least the non-skin facing surface of the absorber.
[3] The absorbent article according to [1] or [2], wherein the core wrap sheet laminated on the non-skin facing surface of the absorber has a pair of cut portions along the longitudinal direction.
[4] The absorbent article according to any one of [1] to [3], wherein the cutting portion is composed of an intermittent cutting line or a continuous cutting line.
[5] The absorbent article according to any one of [1] to [4], wherein the contact surface between the absorber and the core wrap sheet is joined at least partially.
[6] The absorbent article according to any one of [1] to [5], wherein the absorbent body and the core wrap sheet are not bonded to each other on the non-skin facing surface side of the bending groove.
[7] The absorbent article has a pair of support elastic members extending in the longitudinal direction.
The absorbent article according to any one of [1] to [6], wherein the support elastic member is superimposed on the absorber side end region on the outer side in the width direction of the pair of bending grooves.
[8] The absorbent article according to [7], wherein the length of the support elastic member in the longitudinal direction is longer than the length of the bending groove in the longitudinal direction.
[9] The absorbent article according to [7] or [8], wherein the support elastic member is provided on the non-skin facing surface side of the absorbent body.
[10] The absorbent article according to any one of [1] to [9], wherein the absorber further has a diffusion groove in the non-bending region.

According to the present invention, it is possible to obtain an absorbent article that easily forms a bent shape and easily maintains the formed bent shape.

FIG. 1 is a plan view showing an example of an absorbent article. FIG. 2 is a cross-sectional view showing an example of an absorbent article. FIG. 3 is a cross-sectional view showing an example of an absorbent article. FIG. 4 is an exploded view of the absorber having the core wrap sheet disassembled in an unfolded state. FIG. 5 is a diagram illustrating a form of a cut portion. FIG. 6 is a cross-sectional view showing an absorbent article having a W-shaped bent shape. FIG. 7 is a plan view showing an example of the absorbent article. FIG. 8 is an exploded view of the absorbent article in an unfolded state. FIG. 9 is a plan view showing an example of the absorbent article.

Hereinafter, the present invention will be described in detail. The description of the constituent elements described below may be based on typical embodiments or specific examples, but the present invention is not limited to such embodiments.

As used herein, the "longitudinal direction" means the direction connecting the front body located on the abdominal side of the wearer and the back body located on the back side of the wearer among the absorbent articles. Further, the "width direction" means a direction orthogonal to the longitudinal direction of the absorbent article in a plane.
Further, in the present specification, the “skin facing surface” means a surface facing the wearer's skin when the absorbent article is worn. Further, the “non-skin facing surface” means a surface that does not face the wearer's skin when the absorbent article is worn. In addition, in this specification, "AB" means "A or more and B or less".

The present invention has a longitudinal direction and a width direction orthogonal to the longitudinal direction, and is located on the skin-facing surface side of the absorber, the absorber, the core wrap sheet laminated on at least the skin-non-facing surface of the absorber, and the absorber. The present invention relates to an absorbent article comprising a sheet-shaped skin-facing surface side member and a sheet-shaped non-skin facing surface side member located on the skin non-facing surface side with respect to the core wrap sheet. Here, the core wrap sheet laminated on the non-skin facing surface of the absorber has a cut portion along the longitudinal direction, and the absorber has a pair of bent grooves along the longitudinal direction. Then, at least a part of the cut portion is superimposed on the skin non-opposing surface side of the bending groove.

The form of the absorbent article of the present invention is not particularly limited, but the absorbent article may be an absorbent pad, and examples of such an absorbent pad include sanitary napkins and urine. The tori pad can be mentioned. In addition, the absorbent article of the present invention may relate to a disposable diaper.

FIG. 1 is a plan view showing an embodiment of the absorbent article 100 according to the present invention. As shown in FIG. 1, the absorbent article 100 includes a front body 1 located on the abdominal side of the wearer, a back body 2 located on the back side of the wearer, and an inseam 3 located between them. In addition, it can be divided in the longitudinal direction. The front body 1, the inseam 3, and the back body 2 can be each region when the absorbent article is divided into three equal parts in the longitudinal direction. When the absorber 31 has a region narrowed in the width direction, the portion including the region is defined as the inseam 3, and the regions on both sides of the inseam 3 in the longitudinal direction are designated as the front body 1 and the rear body 2, respectively. You can also do it. An absorber 31 for absorbing and holding a liquid such as urine is arranged from the back body 2 to the front body 1 around the inseam 3. A sheet-shaped skin-facing surface side member 32 is provided on the skin-facing surface side of the absorber 31, and a sheet-shaped skin-non-facing surface side member 33 is provided on the skin-non-facing surface side of the absorber 31. A core wrap sheet 35 is provided between the absorber 31 and the skin non-opposing surface side member 33, and the core wrap sheet 35 is laminated on at least the skin non-opposing surface of the absorber 31. A core wrap sheet 35 may be provided between the absorber 31 and the skin facing surface side member 32. In this case, the core wrap sheet 35 may be laminated on the skin facing surface side of the absorber 31. preferable. The core wrap sheet 35 may be a member that covers the entire absorber 31. Excreted liquid such as urine permeates through the skin facing surface side member 32, is absorbed and held by the absorber 31, and is prevented from leaking to the outside by the skin non-facing surface side member 33.

In FIG. 1, the width direction of the absorbent article 100 is drawn as the same width in all areas, but the front body 1 and the back body 2 of the absorbent article 100 are portions extending to the left and right outward in the width direction. Side flaps may be provided. For example, when the absorbent article 100 is a tape-type disposable diaper, the shape of the side flap may be deformed if necessary. When the absorbent article 100 is a tape-type disposable diaper, a fastening tape is attached so as to extend from the left and right side edges of the side flaps of the back body 2 in the width direction, and the fastening tape is stopped on the front body 1. You may attach a front patch to attach. With such a configuration, the absorbent article 100 is attached to the back body 2 with the back body 2 applied to the back of the wearer and the front body 1 applied to the wearer's abdomen. Can be attached to the wearer's body by fastening the to the front patch provided on the front body 1.

FIG. 2 is a cross-sectional view schematically showing the cross-sectional structure of the absorbent article 100 in the XX rays shown in FIG. As shown in FIG. 2, the absorbent article 100 basically includes a skin facing surface side member 32, a skin non-facing surface side member 33, and an absorber 31 arranged between them. Further, it is preferable that the core wrap sheet 35 is laminated on at least the non-skin facing surface of the absorber 31, and the core wrap sheet 35 is directly laminated on at least the non-skin facing surface of the absorber 31. The core wrap sheet 35 is preferably laminated directly on both sides of the absorber 31, and more preferably the absorber 31 is covered with the core wrap sheet 35. As the core wrap sheet 35, tissue paper, absorbent paper, a hydrophilized non-woven fabric, or the like can be appropriately used.

The core wrap sheet 35 is preferably laminated directly on at least the non-skin facing surface of the absorber 31, but another sheet may be sandwiched between the absorber 31 and the core wrap sheet 35. Such a sheet may exhibit functions such as improving the absorption rate and diffusion rate of the excrement liquid and preventing the absorber 31 from losing its shape. Examples of materials constituting other sheets include woven fabrics, non-woven fabrics, and porous films. Further, for example, fibers of a thermoplastic resin such as polypropylene, polyethylene, polyester or nylon may be hydrophilized to be further made into a non-woven fabric. Examples of the non-woven fabric include an air-through non-woven fabric, a point-bonded non-woven fabric, a spunbonded non-woven fabric, and a melt-blown non-woven fabric.

In the cross-sectional view of FIG. 2, in the central region of the absorbent article 100 in the width direction, from the skin facing surface side, the skin facing surface side member 32, the absorbent body 31 wrapped in the core wrap sheet 35, and the skin non-facing surface. The side members 33 are laminated in this order. As shown in FIGS. 1 and 2, at least a part of the skin facing surface side member 32 and the skin non-facing surface side member 33 are joined to each other around the absorber 31. As a result, the absorber 31 is surrounded by a joint portion between the skin facing surface side member 32 and the skin non-facing surface side member 33.

The skin-facing surface side member 32 is a member arranged on the skin-facing surface side with respect to the absorber 31. When the absorber 31 also has the core wrap sheet 35 on the skin facing surface side, the skin facing surface side member 32 is a member laminated on the skin facing surface side with respect to the skin facing surface side core wrap sheet 35. be. The skin-facing surface side member 32 is preferably a sheet-like member, and may be a one-layer sheet-like member or a two-layer or more sheet-like member. Examples of the skin-facing surface side member 32 include a liquid-permeable top sheet 32a. Examples of the liquid permeable material constituting the top sheet include woven fabrics, non-woven fabrics, and porous films. Further, for example, fibers of a thermoplastic resin such as polypropylene, polyethylene, polyester or nylon may be hydrophilized to be further made into a non-woven fabric. Examples of the non-woven fabric include an air-through non-woven fabric, a point-bonded non-woven fabric, a spunbonded non-woven fabric, and a melt-blown non-woven fabric.

The skin non-opposing surface side member 33 is a member disposed on the skin non-opposing surface side of the absorber 31, and is on the skin non-opposing surface side of the core wrap sheet 35 laminated on the skin non-opposing surface of the absorber 31. It is a member laminated on. The skin non-opposing surface side member 33 is preferably a sheet-like member, and may be a one-layer sheet-like member or a two-layer or more sheet-like member. Examples of the skin non-opposing surface side member 33 include a liquid-impermeable back sheet 33a and / or a cover sheet 33b.

The back sheet 33a is a member for preventing the liquid that has passed through the top sheet 32a and absorbed by the absorber 31 from leaking to the outside of the absorbent article 100. Therefore, the back sheet 33a is made of a liquid-impermeable material. The back sheet 33a covers the absorber 31 from the non-skin facing surface side in order to prevent liquid leakage from the bottom surface of the absorber 31. An example of the impermeable material constituting the back sheet 33a is a liquid impermeable film made of polyethylene resin. However, in order to ensure air permeability, it is preferable to use a microporous polyethylene film in which a plurality of fine pores of 0.1 to 4 μm are formed.

The cover sheet 33b is a sheet that covers the outer surfaces of the front body 1, the inseam 3, and the back body 2, and is a member for reinforcing the back sheet 33a and improving its feel. The cover sheet 33b is attached to the back sheet 33a on the non-skin facing surface side. As a material constituting the cover sheet 33b, a woven fabric or a non-woven fabric is used. In particular, as a material constituting the cover sheet 33b, it is preferable to use a non-woven fabric or a wet non-woven fabric made of a thermoplastic resin such as polyethylene, polypropylene or polyester.

The absorber 31 is made of an absorbent material to absorb and retain the wearer's urine and body fluids. As the absorbent material, for example, fluff pulp, a super absorbent polymer (“SAP”), a hydrophilic sheet, or the like can be adopted. Examples of fluff pulp are wood pulp and non-wood pulp defibrated into cotton. An example of a super absorbent polymer is sodium polyacrylate. As the hydrophilic sheet, for example, a tissue, absorbent paper, or a non-woven fabric subjected to a hydrophilic treatment can be used. As the absorbent material, one of fluff pulp, superabsorbent polymer, and hydrophilic sheet may be used alone, or two or more of them may be used in combination.

The absorber 31 has a pair of bent grooves 60 along the longitudinal direction. The bending groove 60 may be a pair of grooves extending along the longitudinal direction. In the present specification, the bending groove 60 means a groove 60 which is partially or wholly composed of recesses.

The bending grooves 60 are preferably arranged parallel to the longitudinal direction. Further, the bending grooves 60 are preferably formed so as to be paired with the center line C in the width direction of the absorber 31 interposed therebetween, and the pair of bending grooves 60 are symmetrical with the center line C in the width direction of the absorber 31. It is preferable that the axes are arranged line-symmetrically.
Further, the bending groove 60 may be arranged so that the midpoint of the bending groove 60 is on the front body 1 side of the center line in the longitudinal direction of the absorber 31, but the bending groove 60 is bent on the center line in the longitudinal direction of the absorber 31. It is preferable that the groove 60 is arranged so that the midpoint in the longitudinal direction comes. That is, it is preferable that the bending groove 60 is arranged in a region centered on the inseam 3.

The length of the bending groove 60 in the longitudinal direction is preferably 10% or more, more preferably 20% or more, and further preferably 30% or more with respect to the total length in the longitudinal direction of the absorber. The length of the bent groove 60 in the longitudinal direction is preferably 70% or less, more preferably 60% or less, and further preferably 50% or less with respect to the total length in the longitudinal direction of the absorber. ..

The width of the bending groove 60 is preferably 1 to 10 mm, more preferably 1 to 5 mm. The width of the bending groove 60 may be the same in the depth direction of the bending groove 60, or may be narrowed along the depth direction of the bending groove 60. When the width is narrowed along the depth direction of the bending groove 60, the width of the bending groove 60 is the maximum width of the bending groove 60.

The bending grooves 60 are preferably a total of two bending grooves, one pair at a time, but may be a pair of bending grooves arranged one by one. For example, the bending groove 60 may be a set of two bending grooves 60, and the set may be a pair of a total of four bending grooves 60. The number of bending grooves is preferably 2 or more and 6 or less.

In the absorber 31, when the shortest distance in the width direction of the region where the bending groove 60 is formed is L mm, the distance in the width direction between the bending grooves 60 forming the pair is 0.2 × Lmm to 0.8 × Lmm. It is preferably 0.2 × L mm to 0.5 × L mm, and more preferably 0.2 × L mm to 0.5 × L mm. When each pair is composed of a plurality of bending grooves 60, the distance in the width direction between the bending grooves 60 is the distance between the bending grooves 60 located on the outermost side in the width direction of the absorber 31. By setting the distance between the bending grooves 60 in the width direction within the above range, the bending shape is easily formed, and the wearing feeling can be further enhanced.

The bending groove 60 is preferably a linear groove extending in the longitudinal direction. However, as long as the absorbent article 100 can be bent along the bending groove 60, it may be bow-shaped or meandering.

The bending groove 60 may be formed only on the absorber 31 or may be formed on both the absorber 31 and the skin facing surface side member 32. For example, the bending groove 60 may be obtained by forming a recess in the absorber 31 and the core wrap sheet 35 laminated on the skin-facing surface of the absorber 31, as shown in FIG. .. Further, as shown in FIG. 3, the bending groove 60 is obtained by forming recesses in the absorber 31, the core wrap sheet 35 laminated on the skin facing surface side of the absorber 31, and the top sheet 32a. It may be something that can be done.

The bent groove 60 can be formed by reducing the basis weight of the absorber in the bent groove portion or by embossing (squeezing) the absorber 31. When reducing the basis weight of the absorber in the bent groove 60 portion, the forming drum used in the step of forming the absorbent material constituting the absorber 31 into a sheet having a predetermined shape has an uneven surface corresponding to the shape of the bent groove 60. Is preferably provided on the outer periphery of the drum. In the forming drum, since the suction is performed toward the inside of the drum, the absorber 31 in which the bending groove 60 is formed along the uneven surface on the outer periphery of the drum can be obtained. After that, the core wrap sheet 35 is laminated on the absorber 31, and the absorber 31 having the core wrap sheet 35 is sandwiched between the skin facing surface side member 32 and the skin non-facing surface side member 33.

When the bending groove 60 is formed by embossing (squeezing) the absorber 31, the absorber 31 may be embossed from the skin facing surface side, the skin non-facing surface side, or both side surfaces. In this case, the embossing is preferably performed in a state where the core wrap sheet 35 is laminated on the absorber 31. The embossed roll is formed with irregularities corresponding to the shape of the bent groove 60, and the bent groove 60 can be formed on the absorber 31 by pressing the embossed roll while rotating from the skin facing surface side. The embossing process may be performed in a state where the skin facing surface side member 32 (top sheet 32a) is laminated, or the skin facing surface side member 32 and the absorber 31 may be bonded at the same time in the embossing process. good. Further, in the embossing process, the skin non-opposing surface side member 33 and the absorber 31 may be bonded at the same time.

In the present invention, the bending groove 60 is preferably formed by embossing. In the bent groove 60 formed in this way, the density of the absorbent material on the non-skin facing surface side of the bent groove 60 is high, so that the absorbent article 100 is easily bent along the bent groove 60. That is, it is possible to bend at a predetermined position with high accuracy. Further, such embossing is preferably performed from the skin-facing surface side of the absorber 31. That is, it is preferable that the bending groove 60 exists on the side facing the skin.

The core wrap sheet 35 laminated on the non-skin facing surface of the absorber 31 has a cut portion 40 along the longitudinal direction. Then, at least a part of the cut portion 40 is superimposed on the skin non-opposing surface side of the bending groove 60 described above. When the core wrap sheet 35 laminated on the non-skin facing surface of the absorber 31 has only one cut portion 40, the cut portion 40 is superposed on either one of the pair of bending grooves 60.

The cut portions 40 are preferably paired, and the core wrap sheet 35 laminated on the non-skin facing surface of the absorber 31 preferably has a pair of cut portions 40 along the longitudinal direction. In FIG. 1, the cut portion 40 which is not originally visible is shown by a dotted line. In FIG. 1, all of the pair of cutting portions 40 are superimposed on the skin non-opposing surface side of the bending groove 60 described above. It is preferable that all of the cut portions 40 are overlapped on the non-skin facing surface side of the bent groove 60, but the length of the cut portion 40 in the longitudinal direction may be longer than the length of the bent groove 60 in the longitudinal direction. When the width of the cut portion 40 is wider than the width of the bent groove 60, only a part of the cut portion 40 may be superimposed on the non-skin facing surface side of the bent groove 60.

FIG. 2 shows a state in which the cut portion 40 is formed on the core wrap sheet 35 laminated on the non-skin facing surface of the absorber 31. In the cross-sectional view of FIG. 2, the cut portion 40 is widely drawn in order to show the configuration and position of the cut portion 40 in an easy-to-understand manner, but each cut portion 40 is composed of one cutting line. In some cases, the actual cut portion 40 may not be widely observed as drawn in the drawing.

FIG. 4 is an exploded view of the absorber 31 in an unfolded state. FIG. 4 is an exploded view of the absorber 31 before being sandwiched between the two core wrap sheets 35. The absorber 31 is formed with a bent groove 60 as described above. A cut portion 40 is formed in the longitudinal direction on the core wrap sheet 35 laminated on the non-skin facing surface of the absorber 31. The cut portions 40 formed on the core wrap sheet 35 on the non-skin facing surface side of the absorber 31 are preferably a pair of cut portions 40, and when the core wrap sheet 35 and the absorber 31 are laminated, each of them is The cut portion 40 of the above is formed so as to come at a position superimposing on each bending groove 60. When joining the constituent members in an overlapping manner, the center lines (C _{1 to} C ₃ ) represented by the alternate long and short dash line in FIG. 4 are laminated and joined so as to overlap each other. In this way, the absorber 31 having the core wrap sheet 35 is obtained.

When the absorber 31 is covered with one core wrap sheet 35, the absorber 31 is covered with the core wrap sheet 35 so that the cut portion 40 formed in advance on the core wrap sheet 35 and the bending groove 60 overlap with each other. It may be wrapped. Further, after covering the absorber 31 with the core wrap sheet 35, the cut portion 40 may be formed at a position overlapping the bending groove 60.

The cutting portion 40 is preferably composed of an intermittent cutting line or a continuous cutting line. Here, examples of the intermittent cutting line include a cutting line having at least one intermittent portion and a perforation line composed of repeating the intermittent portion and the cutting line. A continuous cutting line is a cutting line having no intermittent portion.
FIG. 5 illustrates the form of the cut portion 40. FIG. 5A shows a cutting portion 40 composed of one continuous cutting line. 5 (b) and 5 (c) show a cut portion 40 surrounded by a continuous cut line. In FIGS. 5B and 5C, a region surrounded by a continuous cutting line is a notch, and in the present invention, such a notch may be referred to as a cutting 40. .. FIG. 5D shows a cutting portion 40 in which a plurality of intermittent cutting lines (perforation lines) are arranged in the width direction. In FIG. 5D, the cutting portion 40 is formed by an aggregate of intermittent cutting lines. In the present invention, the core wrap sheet 35 has mobility that can spread in the width direction by forming the cut portion 40 in the longitudinal direction of the core wrap sheet 35 laminated on the non-skin facing surface of the absorber 31. Become. As a result, when the absorber 31 is bent, the core wrap sheet 35 can easily follow the bent shape of the absorber 31, and the absorber 31 can easily form the bent shape, and at the same time, the formed bent shape is maintained. It becomes easy to be done.

In the present invention, a cut portion may also be formed on the cover sheet 33b. In the present specification, the cut portion formed on the cover sheet 33b is referred to as an outer cut portion. It is preferable that the outer cut portion also overlaps with the skin non-opposing surface side of the bending groove 60. Further, in the present invention, a cut portion may be formed on the core wrap sheet 35 laminated on the skin-facing surface of the absorber 31. In the present specification, the cut portion formed on the core wrap sheet 35 laminated on the skin-facing surface of the absorber 31 is referred to as an inner cut portion. It is preferable that the inner cut portion also overlaps with the skin facing surface side of the bending groove 60. The form of the outer cut portion and the inner cut portion can be exemplified in the same form as the form of the cut portion 40 described above.

At the time of mounting, the absorbent article 100 bends along the pair of bending grooves 60. At that time, the cross-sectional shape of the absorbent article 100 in the width direction may be deformed to be W-shaped, or the cross-sectional shape of the absorbent article 100 in the width direction may be deformed to be concave. .. When the cross-sectional shape of the absorbent article 100 in the width direction is concave, the region sandwiched between the bending grooves 60 becomes linear. In the present invention, the absorber 31 has a pair of bent grooves 60, and the core wrap sheet 35 laminated on the non-skin facing surface of the absorber 31 has the cut portion 40, so that the bent shape as described above is obtained. It is easy to form and the formed bent shape is easy to maintain. This is because the presence of the cut portion in the core wrap sheet 35 on the non-skin facing surface side of the bending groove 60 makes it possible to weaken the tension of the core wrap sheet 35 that works in the direction of eliminating the bending shape. Further, when the skin non-opposing surface side member 33 has an outer cut portion, the tension of the skin non-opposing surface side member 33 acting in the direction of eliminating the bent shape can be weakened, and the bent shape can be more easily maintained. As described above, the shape of the absorber 31 is easily bent when the absorbent article 100 is worn, and the bent shape is maintained, so that the leakage of the excrement liquid can be effectively prevented. Further, by maintaining the bent shape, the excrement liquid can be reliably absorbed even when the excretion liquid is absorbed a plurality of times. Further, by maintaining the bent shape, the wearing feeling at the time of wearing is not impaired.

Above all, as shown in FIG. 6, it is preferable that the absorbent article 100 is bent along a pair of bending grooves 60 and deformed so that the cross-sectional shape of the absorbent article 100 in the width direction is W-shaped. .. In this case, since the absorbent article 100 has the bent groove 60, the peripheral portion of the bent groove 60 is bent so as to be convex toward the skin non-opposing surface side, whereby the width direction of the absorbent article 100 The central area of is convex toward the wearer's excretory opening. As described above, when the absorbent article 100 is bent in a W shape, the central region can be easily brought into close contact with the wearer's excretory opening, and the leakage of the excretory liquid can be prevented more effectively. Further, by maintaining the W-shaped bent shape, it is possible to further enhance the wearing feeling and fit when worn. In the present specification, the central region of the absorbent article 100 in the width direction is a region sandwiched between a pair of bending grooves 60.

Around the absorber 31, at least a part of the skin facing surface side member 32 and the skin non-facing surface side member 33 are joined to each other. When the core wrap sheet 35 is laminated on the absorber 31, the contact surfaces of the absorber 31 and the core wrap sheet 35 are preferably joined at least partially, and all of the contact surfaces are joined. Is more preferable. Then, it is preferable that the contact surfaces between the members existing between the skin facing surface side member 32 and the absorber 31 are joined at least partially, and all of the contact surfaces are joined. More preferred. Further, it is preferable that the contact surfaces between the members existing between the skin non-opposing surface side member 33 and the absorber 31 are joined at least partially, and all of the contact surfaces are joined. Is more preferable. The bonding method may be, for example, bonding using a hot melt adhesive or other highly fluid adhesive, or welding by heat, ultrasonic waves, or the like such as heat sealing.

When the core wrap sheet 35 is laminated on the absorber 31, it is preferable that the contact surfaces of the absorber 31 and the core wrap sheet 35 are joined in the entire contact area.

It is preferable that the contact surfaces between the members existing between the skin facing surface side member 32 and the absorber 31 are joined in the entire contact area. Further, it is preferable that the contact surfaces between the members existing between the skin non-opposing surface side member 33 and the absorber 31 are also joined in the entire contact area, but from the skin non-opposing surface side member 33. Non-bonded regions may exist between the members existing between the absorbers 31. As described above, a non-bonded region in which the absorber 31 and the core wrap sheet 35 are not bonded may be provided on the skin non-opposing surface side of the bent groove 60 of the absorber 31, or the bent groove 60 of the absorber 31 may be provided. A non-joining region where the core wrap sheet 35 and the non-skin facing surface side member 33 are not joined may be provided on the skin non-facing surface side. The non-skin facing surface side of the bent groove 60 is a region located below the bent groove 60 in the cross-sectional view of FIG. 2 and the like, and is a portion that overlaps the cross-sectional area of the bent groove 60 in the thickness direction. The cross-sectional area of the bent groove 60 means the cross-sectional area where the width of the bent groove is maximized.

When a non-joining region exists between the members of the bending groove 60 on the non-skin facing surface side, the non-joining region may be present in at least a part of the lower part of the bending groove 60. That is, the area of the non-joined region may be smaller than the cross-sectional area of the bent groove 60. On the other hand, the entire lower region of the bent groove 60 may be a non-joined region. For example, the area of the non-joined region may be the same as the cross-sectional area of the bent groove 60, and the non-joined region and the bent groove may overlap in the thickness direction. Further, the area of the non-joined region may be larger than the cross-sectional area of the bent groove 60.
In this specification, the non-joining region means a region where adjacent members are not joined. In the non-joining region, even when adjacent members are in contact with each other, if there is no physical bonding such as adhesion between the members, the region is referred to as a non-joining region.

In the present invention, it is preferable that the respective contact surfaces between the members existing between the skin facing surface side member 32 and the absorber 31 are joined in the entire contact area. Above all, on the skin-facing surface side of the bending groove 60, it is preferable that the contact surfaces between the members existing between the skin-facing surface side member 32 and the absorber 31 are joined. Here, the skin-facing surface of the bending groove 60 is a surface composed of the side wall and the bottom wall of the bending groove 60. The cross-sectional shape of the bent groove 60 in the thickness direction may be a ∨ shape. In this case, the skin-facing surface of the bent groove 60 in the absorber 31 is a surface formed of a side wall. That is, on the inside (inner wall) of the recess of the bending groove 60, it is preferable that the contact surfaces between the members existing between the skin facing surface side member 32 and the absorber 31 are joined.

When the core wrap sheet 35 is directly laminated on the skin facing surface of the absorber 31, as shown in FIG. 2, the absorber 31 and the core wrap sheet 35 are joined to each other on the skin facing surface side of the bending groove 60. It is preferable to have. As shown in FIG. 2, the top sheet 32a, which is the skin facing surface side member 32, is not joined to the core wrap sheet 35 on the skin facing surface side of the bending groove 60, and is not joined to the concave inner wall of the bending groove 60. There may be a gap between the top sheets 32a. Further, when the core wrap sheet 35 is directly laminated on the skin facing surface of the absorber 31, as shown in FIG. 3, all the skin facing surface side members 32 absorb on the skin facing surface side of the bending groove 60. It is preferably directly or indirectly joined to the body 31. Specifically, the absorber 31 and the core wrap sheet 35 are joined on the skin-facing surface side of the bending groove 60, and the top sheet 32a is further joined on the core wrap sheet 35 in the joining region. As shown in FIG. 3, on the skin-facing surface side of the bending groove 60, the contact surfaces between the members existing between the skin-facing surface side member 32 and the absorber 31 are joined to form the absorber 31. The flexibility of the bending position can be increased more effectively, and the accuracy of the bending position can be improved. Further, on the skin-facing surface side of the bending groove 60, the contact surfaces between the members existing between the skin-facing surface side member 32 and the absorber 31 are joined, which is not intended for the skin-facing surface side member 32. It is possible to suppress the occurrence of wrinkles and the like.

In the present invention, the absorbent article 100 may have a groove structure different from the bent groove described above in the central region of the absorbent article 100 in the width direction. The central region refers to a region of the absorber sandwiched between the pair of bending grooves 60.

The absorbent article 100 of the present invention preferably has a pair of support elastic members 50 extending in the longitudinal direction. As the support elastic member 50, for example, rubber made of an elastic material such as natural rubber or synthetic rubber (urethane rubber or the like), an elastic net, an elastic film, or an elastic foam (urethane foam or the like) can be adopted. The support elastic member is fixed to the other constituent members of the absorbent article 100 by an adhesive or other means. As the fixing method, for example, it may be bonded using a hot melt adhesive or other highly fluid adhesive, or it may be welded by heat or ultrasonic waves such as heat sealing. Further, the support elastic member 50 may be fixed to other constituent members of the absorbent article 100 by suturing.

FIG. 7 is a developed view showing an embodiment of the absorbent article 100 having the support elastic member 50. In FIG. 7, the support elastic member 50, which is originally invisible, is shown by a chain double-dashed line. It is preferable that at least a part of the support elastic member 50 overlaps with the absorber 31. The state in which at least a part of the support elastic member 50 is overlapped with the absorber 31 means that when the absorbent article 100 is developed as shown in FIG. 7 and viewed in a plan view, at least a part of the support elastic member 50 is formed in the thickness direction. Is present in the region of the absorber 31. As shown in FIG. 7, it is more preferable that all of the support elastic members 50 overlap with the absorber 31. Further, as shown in FIG. 7, it is preferable that the support elastic member 50 is superposed on the side end region of the absorber 31 on the outer side in the width direction of the pair of bending grooves 60. By superimposing the support elastic member 50 on the side end region of the absorber 31, it becomes easier to maintain the bent shape.

The support elastic member 50 is a member that extends in the longitudinal direction in the absorbent article 100, and the constituent member to which the support elastic member 50 is fixed is not particularly limited. For example, the support elastic member 50 may be provided between the absorber 31 and the top sheet 32a, or may be provided between the absorber 31 and the back sheet 33a. Further, the support elastic member 50 may be provided between the back sheet 33a and the cover sheet 33b. Above all, it is preferable that the support elastic member 50 is provided on the non-skin facing surface side of the absorber 31. However, it is preferable that the support elastic member 50 is not exposed on the outer surface. That is, the support elastic member 50 is preferably disposed between the cover sheet 33b and the absorber 31, and particularly preferably disposed between the cover sheet 33b and the back sheet 33a. As a result, the support elastic member 50 easily lifts the absorber 31 toward the skin surface side in the mounted state to support the bent shape of the absorber 31.

FIG. 8 is an exploded view of the absorbent article 100 of the present invention disassembled in an unfolded state. As shown in FIG. 8, in the absorbent article 100 of the present embodiment, the cover sheet 33b, the back sheet 33a, the absorber 31, and the top sheet 32a that touches the wearer's skin are joined in order from the outside. It was done. In FIG. 8, the absorber 31 is covered with the core wrap sheet 35. When the constituent members are laminated and joined, the center lines (C _{11 to} C ₁₄ ) represented by the alternate long and short dash line in FIG. 8 are laminated and joined so as to overlap each other. In FIG. 8, the support elastic member 50 is provided between the back sheet 33a and the cover sheet 33b, and the support elastic member 50 is fixed to the cover sheet 33b.

When the support elastic member 50 is fixed to another component, the support elastic member 50 is fixed to the other component in an extended state. At this time, at least a part of the support elastic member 50 is fixed. After being fixed, the support elastic member 50 contracts, and wrinkles (gathers) are formed at that time. In the present specification, wrinkles (gathers) formed when the support elastic member 50 contracts are referred to as support gathers. The support gathers lift the absorber 31 toward the wearer's skin surface side by applying a force in the direction of contracting the absorber 31 in the longitudinal direction to support the absorber 31.

The length of the fixed region of the support elastic member 50 in the longitudinal direction is preferably 30% or more, more preferably 40% or more, and more preferably 50% or more with respect to the total length in the longitudinal direction of the absorber. More preferred. Further, the length of the fixed region of the support elastic member 50 in the longitudinal direction is preferably 99% or less, more preferably 90% or less, and more preferably 80% or less with respect to the total length in the longitudinal direction of the absorber. It is more preferable, and it is particularly preferable that it is 75% or less. Here, the fixed region of the support elastic member 50 means the maximum range of the region where the support elastic member 50 is fixed to other constituent members of the absorbent article 100. For example, when the support elastic member 50 is fixed to the cover sheet 33b, the fixed region of the support elastic member 50 means the maximum range of the region where the support elastic member 50 is fixed to the cover sheet 33b. When the support elastic member 50 and the cover sheet 33b are intermittently fixed, the region located between the outermost ends of the fixed portions at both ends is referred to as a fixed region. Further, when each pair of the support elastic members 50 is composed of two or more elastic members, the region between the outermost and innermost elastic members among the two or more elastic members is the fixed region. That is.

The longitudinal length of the support elastic member 50 is preferably longer than the longitudinal length of the bending groove 60. Further, it is more preferable that the length of the fixed region of the support elastic member 50 in the longitudinal direction is longer than the length of the bending groove 60 in the longitudinal direction. For example, when the longitudinal length of the fixed region of the support elastic member 50 is S and the longitudinal length of the bending groove 60 is T, the S / T value is preferably 1.2 or more. It is more preferably .5 or more, and even more preferably 2.0 or more.

The support elastic member 50 is a pair of members extending in the longitudinal direction, and is preferably arranged parallel to the longitudinal direction. However, the support elastic member 50 does not necessarily have to be arranged parallel to the longitudinal direction as long as it can exert a contraction force so as to form the support gathers as described above, and may meander or have a bow shape. There may be.

The support elastic member 50 may be a total of two elastic members paired one by one, but it is preferable that the support elastic member 50 is a pair of elastic members arranged one by one. For example, the support elastic member 50 may be a total of four elastic members in which two are paired and the pair is paired, and a total of six in which three are paired. It may be an elastic member of a book. The total number of elastic members is preferably 2 or more and 20 or less, and more preferably 2 or more and 10 or less.

The absorbent article 100 of the present invention may further have a diffusion groove 65, and preferably further has a diffusion groove 65 in the non-bending region of the absorber 31. Here, the non-bending region in the longitudinal direction of the absorber 31 is a region from the longitudinal end of the bending groove 60 of the absorber 31 to the longitudinal end of the absorber 31, and the non-bending region is the absorber. There are two regions in 31. The non-bent region is a region in which the bent groove 60 does not extend, but a bent shape formed along the bent groove 60 may be formed even in the non-bent region.

In the non-bent region in the longitudinal direction of the absorber 31, the region other than the diffusion groove 65 can be called a flat portion. The diffusion groove means a groove that is partially or wholly composed of recesses.

The diffusion groove 65 functions as a flow path for excrement liquid in the absorber 31. That is, the diffusion groove 65 can also be called a liquid flow path. By providing such a diffusion groove 65 in the absorber 31, the diffusion groove 65 can exert a capillary force. Here, the capillary force is a force capable of circulating the excrement liquid along the diffusion groove 65. As a result, the absorber 31 can diffuse the excrement liquid along the flow path, and the excrement liquid excreted in a large amount can be quickly absorbed in a wide area of the absorber 31. Further, the absorption of the excrement liquid is not biased only to a part of the absorbent material constituting the absorber 31, and the absorption liquid can be efficiently absorbed by the absorbent material.

Further, by providing the diffusion groove 65 in the non-bending region of the absorber 31, it is possible to reduce the discomfort caused by the rigidity of the absorber itself. In particular, by providing the groove portion in the non-bending region of the absorber 31, it is possible to reduce the discomfort of the absorber in the abdomen and the back. Further, since the contact area between the absorber 31 and the skin can be reduced in the abdomen and the back, the sticky feeling and the discomfort associated therewith can be eliminated. Further, since the diffusion groove 65 also acts as a ventilation groove, it is possible to reduce stuffiness when the absorber is attached.

FIG. 9 is a plan view illustrating an example of the configuration pattern of the diffusion groove 65 included in the absorber 31. The diffusion groove 65 is formed intermittently or continuously in the longitudinal direction of the absorber 31. In FIG. 9, a plurality of linear diffusion grooves 65 are provided, and a grid-like flat portion surrounding the outer periphery is formed in the diffusion grooves 65. Further, in FIG. 9, the diffusion groove 65 is formed so as to be connected in the longitudinal direction of the absorber 31.

The absorbent article 100 may be an absorbent pad, and examples of such an absorbent pad include a sanitary napkin and a urine absorbing pad. Further, the absorbent article 100 of the present invention may relate to a disposable diaper. It is also possible to stack the absorbent pad on the inner surface side of a pants-type or tape-type disposable diaper.

Disposable diapers are roughly classified into pants-type disposable diapers and tape-type disposable diapers. Pants-type disposable diapers are disposable diapers in which both front and back bodies are pre-joined. The pants-type disposable diaper may be a cross-linked type having a structure in which the absorption unit main body bridges between the front body exterior body and the back body exterior body, which are formed as separate bodies. In addition, the pants-type disposable diaper is an integrated type in which the absorption part body is fixed around the crotch to the exterior body that is integrally formed by hanging from the front body through the inseam to the back body. May be good. The tape-type disposable diaper is a type of disposable diaper in which bonding tapes are attached to both sides of the front body or the back body, and the front body and the back body are joined by using the bonding tape when worn.
When the absorbent article 100 is a disposable diaper or the like, a known configuration can be appropriately adopted for other constituent members.

1 Front body 2 Back body 3 Inseam 31 Absorbent 32 Skin facing surface side member 32a Top sheet 33 Skin non-facing surface side member 33a Back sheet 33b Cover sheet 35 Core wrap sheet 40 Cutting part 50 Support elastic member 60 Bending groove 65 Diffusion Groove 100 absorbent article

Claims (10)

It has a longitudinal direction and a width direction orthogonal to the longitudinal direction.
Absorber and
A core wrap sheet laminated on at least the non-skin facing surface of the absorber, and
A sheet-shaped skin-facing surface-side member located on the skin-facing surface side of the absorber,
A sheet-like non-skin facing surface side member located on the non-skin facing surface side of the core wrap sheet is provided.
The core wrap sheet laminated on the non-skin facing surface of the absorber has a cut portion along the longitudinal direction.
The absorber has a pair of bend grooves along the longitudinal direction.
An absorbent article in which at least a part of the cut portion is superimposed on the skin non-opposing surface side of the bending groove. The absorbent article according to claim 1, wherein the core wrap sheet is directly laminated on at least the non-skin facing surface of the absorbent body. The absorbent article according to claim 1 or 2, wherein the core wrap sheet laminated on the non-skin facing surface of the absorber has a pair of cut portions along the longitudinal direction. The absorbent article according to any one of claims 1 to 3, wherein the cutting portion is composed of an intermittent cutting line or a continuous cutting line. The absorbent article according to any one of claims 1 to 4, wherein the contact surface between the absorber and the core wrap sheet is joined at least partially. The absorbent article according to any one of claims 1 to 5, wherein the absorbent body and the core wrap sheet are not joined on the skin non-opposing surface side of the bent groove. The absorbent article has a pair of support elastic members extending in the longitudinal direction.
The absorbent article according to any one of claims 1 to 6, wherein the support elastic member is superimposed on the absorber side end region on the outer side in the width direction of the pair of bending grooves. The absorbent article according to claim 7, wherein the length of the support elastic member in the longitudinal direction is longer than the length of the bending groove in the longitudinal direction. The absorbent article according to claim 7 or 8, wherein the support elastic member is provided on the non-skin facing surface side of the absorbent body. The absorbent article according to any one of claims 1 to 9, wherein the absorber further has a diffusion groove in a non-bent region.

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