JP7073830B2 - Absorbent article - Google Patents

Description

The present invention relates to an absorbent article for suppressing leakage of discharged body fluid.

Conventionally, absorbent articles such as disposable diapers (hereinafter, also simply referred to as “diapers”) that induce the discharged body fluid (hereinafter, also simply referred to as “body fluid”) to be absorbed by the absorber are widely known. The absorbent article is required to confine the body fluid inside and suppress the leakage of the body fluid.

Therefore, in contrast to the occurrence of return from the inside of the absorbent article to the skin contact surface side (hereinafter, also referred to as “wet back”), for example, Patent Document 1 describes a liquid-permeable top sheet skin pad. An absorbent article that suppresses wetback by arranging hydrophobic sheets on both ends in the width direction on the tangent side is disclosed. Further, for example, in Patent Document 2, hydrophobic sheets are provided on both ends in the width direction of the liquid-permeable top sheet on the skin contact side, and elastic members are arranged in an elastic state at the free ends thereof. The three-dimensional gathers formed thereby disclose an absorbent article that suppresses wetback.

Japanese Unexamined Patent Publication No. 02-102649 Japanese Unexamined Patent Publication No. 2011-104397

However, in the absorbent article described in Patent Document 1, it takes time and effort to align and attach the hydrophobic sheet to the top sheet, and in the absorbent article described in Patent Document 2, three-dimensional gathers are specially arranged. Since it may be necessary to configure it, it is possible that the product cost will increase. For this reason, there is still room for improvement in absorbent articles for suppressing leakage of body fluids.

An object of the present invention is to provide an absorbent article that can easily suppress the leakage of body fluid by confining the body fluid inside.

The absorbent article according to the present invention is an absorbent article having a longitudinal direction, a width direction and a thickness direction orthogonal to each other and having an absorbent body, and the absorbent body is configured to include an absorbent material. A core composed of at least two sheets including an absorbent core, an upper core wrap sheet covering the skin contact surface side of the absorbent core, and a lower core wrap sheet covering the skin non-contact surface side of the absorbent core. A wrap sheet is provided, and a portion of the absorbent core folded back toward the skin contact surface side at both side ends in the width direction is closer to the skin contact surface side than the upper layer core wrap sheet. It is arranged so as to exist, and is characterized in that the folded portion and the upper layer core wrap sheet are not joined at the central portion of the absorber in the longitudinal direction.

According to the present invention, since the pocket structure is formed in the region where the folded portion of the lower core wrap sheet and the upper core wrap sheet are not joined, the body fluid can be stored in the pocket structure, and as a result, the body fluid can be stored. It is possible to suppress leakage.

It is a perspective view seen from the front side in the appearance of an example of the diaper which concerns on one Embodiment of this invention. It is an exploded perspective view of the diaper shown in FIG. It is a top sheet view of the stretched diaper which concerns on one Embodiment of this invention. It is a top sheet view of the absorber which concerns on one Embodiment of this invention. It is sectional drawing in the VV direction in FIG. It is sectional drawing of the diaper in the wearing state which concerns on one Embodiment of this invention.

An embodiment of the absorbent article according to the present invention will be described in detail with reference to FIGS. 1 to 6. However, the present invention is not limited to the embodiment of the present embodiment. In the scope of claims, the specification or the drawings, the direction extending from the ventral side to the dorsal side of the wearer of the absorbent article through the inseam is defined as the longitudinal direction, and the direction orthogonal to the longitudinal direction is defined as the width direction. The normal direction of the front surface or the back surface of the sex article is the thickness direction. These longitudinal, width, and thickness directions are orthogonal to each other. The absorbent article according to the present invention has the longitudinal direction, the width direction, and the thickness direction.

First, an embodiment in which the present invention is applied to a deployable disposable diaper will be described below.

<Main composition of diapers>
FIG. 1 shows a perspective view of an example of a diaper according to an embodiment of the present invention as viewed from the front side. The diaper 10 according to the present embodiment is a deployable disposable diaper and has a front body region 10F, a back body region 10R, and an inseam region 10C connecting the front body region 10F and the back body region 10R. Further, when worn, the front body region 10F and the back body region 10R form a waist-circumferential opening 10W that surrounds the wearer's waist portion. Similarly, a pair of left and right leg-circumferential openings 10L that surround the thigh portions of both legs of the wearer are formed by the lower end portions of the front body region 10F and the rear body region 10R and the inseam region 10C.

When worn, the front body area 10F is located on the ventral side of the wearer, and the back body area 10R is located on the back side of the wearer. When worn, the inseam region 10C covers the wearer's inseam, and the wearer's legs are passed through the pair of left and right leg-circumferential openings 10L. Therefore, the leg circumference opening 10L is located at any of the thighs from the bases of both legs of the wearer.

The virtual line P extends from the ventral side to the dorsal side in the central part of the diaper through the inseam part. Specifically, for example, if the waist side of the diaper is defined as the upper side and the inseam side as the lower side, the virtual line P extends along the surface of the diaper and in the vertical direction, and on the back side via the inseam portion. Also extends in the vertical direction.

At the left and right end edges of the back body area 10R of the cover sheet 11 located on the outside of the diaper 10, when worn, they are overlapped with the left and right end edges of the front body area 10F and connected to form an opening 10L around the legs. A pair of left and right fastening tapes 10A to be obtained are adhered to each other. The fastening tape 10A is repeatedly peelably bonded to the front patch sheet 10B adhered to the cover sheet 11 of the front body region 10F.

FIG. 2 is a schematic exploded perspective view of the diaper 10 shown in FIG. 1, and FIG. 3 is a plan view of the stretched diaper 10 according to the present embodiment as viewed from the top sheet 14 side. The absorber 13 in FIG. 2 and the diaper 10 in FIG. 3 are shown in a partially broken state for convenience of explanation.

As shown in FIG. 2, the diaper 10 in the present embodiment is, in order from the outside, a cover sheet 11 formed of a thin non-woven fabric in order to obtain a good feel, and a back sheet (back sheet) having liquid impermeable properties. It has a laminated structure in which 12, an absorber 13, a liquid-permeable top sheet (surface sheet) 14, and a pair of side sheets 15 are laminated.

A pair of notched portions 11N forming an opening around the leg 10L are formed on both the left and right sides of the inseam region 10C of the cover sheet 11. A pair of rubber threads 16 for forming gathers around the legs are adhered between the cover sheet 11 and the pair of side sheets 15 in an stretched state.

The top sheet 14 is made of a non-woven fabric having liquid permeability or the like. The back sheet 12 is joined to the cover sheet 11, the absorber 13 is arranged between the back sheet 12 and the top sheet 14, and the top sheet 14 is joined to the back sheet 12 via the absorber 13. .. That is, in the diaper 10, the skin contact surface side of the absorber 13 is covered with the top sheet 14, and the skin non-contact surface side of the absorber 13 is covered with the back sheet 12. Further, of the back sheet 12, the region corresponding to the upper end portion of the back body region 10R extends along the width direction of the back sheet 12 and has elasticity to give the wearer an appropriate wearing feeling around the waist. Sheet 10D is joined.

A pair of hydrophobic side sheets 15 forming three-dimensional gathers are provided on the left and right side edges of the top sheet 14 in the width direction in the present embodiment. The pair of side seats 15 are members that stand up along the left and right side edges of the absorber 13 when worn to prevent lateral leakage of the discharged body fluid. A notch portion 15N is formed on the outer edge portion of the pair of side sheets 15 in the same shape as the pair of notch portions 11N of the cover sheet 11. A thread rubber 19 as a three-dimensional gather elastic material is arranged in a stretched state on each of the pair of side sheets 15 so that the inner edge portion thereof is folded back toward the absorber 13 and gripped. When the thread rubber 19 contracts, the pair of side seats 15 stand up in the direction of contact with the wearer's skin. The three-dimensional gather can adopt a known configuration used for conventional disposable diapers. For example, it can be formed by sandwiching and fixing a three-dimensional gather elastic material in a stretched state between layers of a water-repellent sheet.

The absorber 13 of the present embodiment, which is located under the top sheet 14, is an absorbent material such as a super absorbent polymer (hereinafter, also referred to as “SAP”) that swells mainly by absorbing pulp or liquid. The absorbent core 17 is wrapped with a core wrap sheet 18 such as a tissue or a non-woven fabric. As shown in FIG. 2 and FIG. 5 described later, the core wrap sheet 18 includes an upper core wrap sheet 18a and a lower core wrap sheet 18b that sandwich and wrap the absorbent core 17 from above and below. In the present embodiment, the core wrap sheet 18 is composed of two sheets, but in the present invention, the core wrap sheet may be composed of three or more sheets. Further, the upper core wrap sheet 18a may be integrally configured or may be composed of a plurality of sheets.

In the diaper 10 according to the present embodiment, a non-joint portion is provided on the surface of the upper core wrap sheet 18a and the lower core wrap sheet 18b facing each other to form a pocket portion capable of storing body fluid. The configuration of the core wrap sheet 18 and its periphery necessary for forming the pocket portion will be described in detail below.

<Pocket part>
FIG. 4 is a plan view of the absorber 13 according to the present embodiment as viewed from the top sheet 14 side. Further, FIG. 5 is a sectional view taken in the VV direction in FIG. 3, and FIG. 6 is a sectional perspective view of the diaper in a worn state according to the present embodiment.

The upper core wrap sheet 18a covers the skin contact surface side of the absorbent core 17, and the lower core wrap sheet 18b covers the skin non-contact surface side of the absorbent core 17. Further, in the lower core wrap sheet 18b, the portion where the lower core wrap sheet 18b is folded back toward the skin contact surface side at both side ends in the width direction of the absorbent core 17 is closer to the skin contact surface side than the upper layer core wrap sheet 18a. It is arranged to exist in.

Further, as shown in FIG. 4, in the core wrap sheet 18, the first non-bonded portion of the lower core wrap sheet 18b and the upper core wrap sheet 18a are not joined at the central portion in the longitudinal direction of the absorber 13. It has a joint portion 21a. With this configuration, as shown in FIGS. 5 and 6, the first pocket portion Pa is formed in the first non-joining portion 21a.

As shown in FIG. 4, the core wrap sheet 18 has a joint portion 20 to which the folded portion of the lower core wrap sheet 18b and the upper core wrap sheet 18a are joined at both ends in the longitudinal direction of the absorber 13. .. This configuration suppresses the leakage of SAP to the outside and suppresses the shape loss of the absorbent core.

In this embodiment, the diaper 10 is further joined to the upper core wrap sheet 18a and the lower core wrap sheet 18b and the surface sheet 14 at least in the widthwise end region of the absorber 13, as shown in FIG. It has a second non-joint portion 21b that does not. With this configuration, as shown in FIGS. 5 and 6, a second pocket portion Pb is formed in the second non-joining portion 21b. Due to the configuration of the second pocket portion Pb, in addition to the first pocket portion Pa described above, a pocket structure is formed in the diaper 10, so that it is possible to confine the body fluid inside the diaper 10 and further suppress the leakage of the body fluid. Become.

The upper core wrap sheet 18a has hydrophilicity. Here, the term "hydrophilic" refers to a property in which the contact angle formed by the liquid surface with the solid surface is small, and generally refers to a liquid surface smaller than 90 °. For example, the upper core wrap sheet 18a and the lower core wrap sheet 18b can be subjected to a hydrophilic treatment to provide desired hydrophilicity. On the other hand, "hydrophobicity" refers to the property that the liquid surface forms a large contact angle with the solid surface, and generally refers to a liquid surface larger than 90 °. In the present embodiment, the hydrophilicity of the lower core wrap sheet 18b is lower than that of the upper core wrap sheet 18a. With this configuration, the discharged body fluid permeates the hydrophilic upper core wrap sheet 18a on the skin contact side and is rapidly guided to the absorbent core 17, while the core wrap sheet 18 is not in contact with the skin. It is possible to realize the liquid stopping effect on the surface side. In the present invention, the lower core wrap sheet 18b may be hydrophobic.

As shown in FIG. 4, the absorber 13 of the present embodiment is divided into three categories: a back body portion M1, an inseam portion M2, and a front body portion M3. A pair of arc-shaped notches 17N are formed in the portion of the absorbent core 17 corresponding to the inseam portion M2 so as to correspond to the pair of leg-circumferential openings 10L. As a result, the absorbent core 17 has an hourglass shape. In the cutout portion 17N, the portion surrounded by the upper layer core wrap sheet 18a, the lower layer core wrap sheet 18b, and the absorbent core 17 has a pocket structure. Therefore, in order to achieve the effect of the present invention of storing body fluid, it is preferable that the absorbent core 17 has a notch 17N formed therein. In the present invention, the shape of the absorbent core 17 is not limited to this, and may be an elongated shape in the longitudinal direction so as to extend to the front body, the inseam, and the back body, and the length in the longitudinal direction and the width direction may be long. It may have various shapes such as a substantially square shape having a similar degree, a shape having rounded corners at the end in the longitudinal direction, an elliptical shape extending in the longitudinal direction, and a circular shape.

In FIG. 5, L is the length in the width direction of the absorber 13, L1 is the length from the widthwise end on the left side of the absorber 13 to the end of the folded portion on the left side of the lower core wrap sheet 18b, and L2 is the length in the folded portion on the left side of the absorber 13. The length from the widthwise end on the right side to the end of the folded portion on the right side of the lower core wrap sheet 18b, respectively. In order to exert the effect of the present invention, the preferred range of the lengths L, L1 and L2 is 80 mm to 150 mm for the length L and 10 mm to 40 mm for the lengths L1 and L2. In the present embodiment, the lengths L1 and L2 are equal, but in the present invention, the lengths L1 and L2 are not limited to this, and they may be different from each other.

Conventionally, the absorbent article is required to confine the body fluid inside the absorbent article and suppress the leakage of the body fluid. Therefore, for example, the absorbent article described in Patent Document 1 has the highest liquid permeability. By arranging hydrophobic sheets on both ends in the width direction of the sheet on the skin contact side, and in the absorbent article described in Patent Document 2, on the skin contact side of the liquid permeable top sheet. Wetback is suppressed by three-dimensional gathers formed by providing hydrophobic sheets on both ends in the width direction and arranging elastic members in an elastic state at the free ends thereof.

However, in the absorbent article described in Patent Document 1, it takes time and effort to align and attach the hydrophobic sheet to the top sheet, and in the absorbent article described in Patent Document 2, three-dimensional gathers are specially arranged. Since it may be necessary to configure it, it is possible that the product cost will increase.

According to the present embodiment, the first pocket portion Pa is formed in the first non-joined portion 21a in which the folded portion of the lower core wrap sheet 18b and the upper layer core wrap sheet 18a are not joined, so that the first pocket is formed. As a result of being able to store the body fluid in the pocket structure of the portion Pa, it is possible to easily suppress the leakage of the body fluid.

Further, since the second pocket portion Pb is formed in the second non-joined portion 21b where the upper layer core wrap sheet 18a and the lower core wrap sheet 18b and the top sheet 14 are not joined, the pocket of the second pocket portion Pb is formed. As a result of being able to store body fluid in the structure, it is possible to further suppress leakage of body fluid.

<Others>
The present invention is not limited to the above-described embodiments and modifications described everywhere, and can be appropriately modified or modified without departing from the technical idea of the present invention.

For example, the structure of the diaper according to the above embodiment or a modification thereof is not limited to the developed type as described above, and may even be a diaper including a structure of an absorbent article specified in the claims. However, any configuration may be used. For example, the present invention can be applied to pants-type disposable diapers, urine pads, and the like.

In addition, the above-described embodiment or a modification thereof is applicable not only to diapers for infants but also to various absorbent articles such as diapers for adults and urine pads.

L Length of the absorber in the width direction L1 Length from the widthwise end on the left side of the absorber to the end of the folded portion on the left side of the lower core wrap sheet L2 From the widthwise end on the right side of the absorber to the right side of the lower core wrap sheet Length to the end of the folded part M1 Back body part M2 Inseam part M3 Front body part Pa 1st pocket part Pb 2nd pocket part 10 diaper 10A Fastening tape 10B Front patch sheet 10F Front body area 10R Back body area 10C Inseam area 10W Waist opening 10L Leg opening 11 Cover sheet 11N, 15N, 17N Notch 12 Back sheet (back sheet)
13 Absorber 14 Top sheet (surface sheet)
15 Side sheet 16, 19 Thread rubber 17 Absorbent core 18 Core wrap sheet 18a Upper core wrap sheet 18b Lower core wrap sheet 20 Joint 21a First non-joint 21b Second non-join

Claims (5)

An absorbent article having a longitudinal direction, a width direction, and a thickness direction orthogonal to each other and having an absorber.
The absorber includes an absorbent core composed of an absorbent material, an upper core wrap sheet covering the skin contact surface side of the absorbent core, and a lower layer covering the skin non-contact surface side of the absorbent core. A core wrap sheet composed of at least two sheets including a core wrap sheet, and
At both side ends of the absorbent core in the width direction, the portion where the lower core wrap sheet is folded back toward the skin contact surface side is arranged so as to be on the skin contact surface side with respect to the upper layer core wrap sheet.
An absorbent article characterized in that the folded portion and the upper core wrap sheet are not joined at the central portion of the absorber in the longitudinal direction. The upper core wrap sheet has hydrophilicity and is
The absorbent article according to claim 1, wherein the lower core wrap sheet has a lower hydrophilicity than the upper core wrap sheet. The absorbent article according to claim 1 or 2, wherein the folded portion and the upper layer core wrap sheet are joined at both ends of the absorber in the longitudinal direction. The absorbent article according to any one of claims 1 to 3, wherein the absorbent core is formed so as to exhibit an hourglass shape. Further provided with a liquid permeable surface sheet covering the skin contact surface side of the absorber,
Any of claims 1 to 4, wherein the upper core wrap sheet, the lower core wrap sheet, and the surface sheet are not joined at least in the end region in the width direction of the absorber. The absorbent article according to one item.

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