JP7261715B2 - absorbent article - Google Patents

Description

TECHNICAL FIELD The present invention relates to an absorbent article to be secured to a worn article.

Patent Literature 1 discloses an absorbent article that is used by being engaged with underwear as a worn article. The liquid-impermeable garment-side sheet (backsheet) of the absorbent article of Patent Document 1 has a plurality of mechanical fanning elements (hook portions). The mechanical fastener element is caught by the worn article, thereby maintaining the state in which the absorbent article is engaged with the worn article.

JP 2012-183379 A

When the absorbent article is worn, various forces are applied to the absorbent article due to leg movements and the like. In a structure in which the mechanical fanning element and the backsheet are integrated as separate bodies, the rigidity of the connecting portion between the mechanical fanning element and the backsheet tends to be low. That is, the entire back member including the mechanical fanning element and the back sheet locally forms a portion with low rigidity. Therefore, when various forces are applied to the absorbent article, there is a possibility that the portion with low rigidity may be broken locally and the state of being locked to the worn article may not be maintained.

Therefore, the present invention provides an absorbent article that suppresses breakage of the hook portion that locks onto the worn article, and that can easily maintain the locked state with respect to the worn article.

An absorbent article according to one aspect comprises a back-and-forth direction and a width direction, a liquid-impermeable backsheet that abuts on a worn article, an absorbent core disposed closer to the skin than the backsheet, and and a surface sheet arranged on the skin surface side. The back sheet has a base portion extending in a plane direction including the front-rear direction and the width direction, and a hook portion protruding from the base portion toward the non-skin surface side and engaged with the worn article. The hook portion is the same member as the base portion, and is formed continuously with the base portion.

FIG. 1 is a plan view of an absorbent article according to an embodiment viewed from the side facing the skin. FIG. 2 is a plan view of the absorbent article according to the embodiment viewed from the non-skin facing side. 3 is a cross-sectional view taken along line AA shown in FIG. 1. FIG. 4 is an enlarged view of a portion B shown in FIG. 3. FIG. FIG. 5 shows the absorbent article in a folded state.

(1) Overview of Embodiments At least the following matters will become clear from the description of this specification and the accompanying drawings.
An absorbent article according to one aspect comprises a back-and-forth direction and a width direction, a liquid-impermeable backsheet that abuts on a worn article, an absorbent core disposed closer to the skin than the backsheet, and and a surface sheet arranged on the skin surface side. The back sheet has a base portion extending in a plane direction including the front-rear direction and the width direction, and a hook portion protruding from the base portion toward the non-skin surface side and engaged with the worn article. The hook portion is the same member as the base portion, and is formed continuously with the base portion. According to this aspect, the absorbent article can be engaged with the worn article via the hook portion projecting to the non-skin surface side of the base portion. When the absorbent article is worn, various forces are applied to the absorbent article due to leg movements and the like. At this time, since the hook portion is the same member as the base portion and the hook portion is formed continuously with the base portion, it is difficult to form a portion with low rigidity locally such as a connection portion between the hook portion and the base portion. . Therefore, when various forces are applied to the absorbent article, the force is received by the entire backsheet, and local breakage of the hook portions can be suppressed. By suppressing breakage of the hook portion, it becomes easier to maintain a locked state with respect to the worn article.

According to a preferred aspect, the plurality of hook portions may be arranged at intervals in the front-rear direction and the width direction, and the heights of the plurality of hook portions may be constant. In a configuration having hooks with different heights, the force applied to the hooks varies due to the difference in height, and the force is applied locally to some of the hooks, causing the hooks to break. There is a risk of However, according to this aspect, since the plurality of hook portions have heights, variations in the force due to differences in height are suppressed, and the entire backsheet receives the force, suppressing local breakage of the hook portions. can.

According to a preferred aspect, the plurality of absorbent articles are individually wrapped in a packaging sheet in a folded state in which the multiple absorbent articles are folded along a plurality of creases, and in the folded state, at least part of the backsheet is: Covered by the packaging sheet, the hook portion may engage the packaging sheet. According to this aspect, the packaging sheet can cover the hook portion before use to protect the hook portion. It is possible to prevent the hook portion from unintentionally engaging with a sheet or the like before use of the absorbent article.

According to a preferred aspect, the entire surface of the backsheet may be covered with the packaging sheet in the unfolded state where the backsheet is not folded with the plurality of creases as base points. According to this aspect, the packaging sheet can cover the entire hook portion before use and protect the hook portion. It is possible to prevent the hook from unintentionally engaging with the topsheet or the like before use of the absorbent article.

According to a preferred aspect, the backsheet has an uncovered area that is not covered by the packaging sheet in an unfolded state where the backsheet is not folded on the basis of the plurality of creases, and the uncovered area is uncovered in the folded state. The hook portions of the covering area may engage the topsheet. According to this aspect, in the folded state, the hook portions of the non-covered region can be covered with the topsheet, and the hook portions other than the non-covered region can be covered with the backsheet. It is possible to prevent the hook from unintentionally engaging with the topsheet or the like before use of the absorbent article.

According to a preferred aspect, the hook portion may be arranged over the entire core arrangement region overlapping the absorbent core in the thickness direction. According to this aspect, the absorbent article can be locked to the worn article through the hook portion over the entire core arrangement region. The entire area where the absorbent core that absorbs body fluids is arranged is less likely to rise from the worn article, so that problems such as unintentional adhesion of body fluids to the body and leakage of body fluids can be suppressed.

According to a preferred aspect, a flap portion may be arranged outside the core arrangement region in the width direction and bulge outward in the width direction, and the hook portion may be arranged in the flap portion. The flap portion does not have an absorbent core arranged thereon, and has lower rigidity than the core arrangement region, and may bend when worn. However, according to this aspect, since the hook portion is arranged on the flap portion, the flap portion can also be locked to the worn article via the hook portion, and the flap portion can be prevented from twisting when worn.

According to a preferred aspect, the hook portions may be arranged over the entire surface of the backsheet. According to this aspect, the backsheet is arranged over the entire surface of the absorbent article, and the hook portions are arranged over the entire surface of the backsheet. can stop

According to a preferred aspect, the thickness of the base portion may be greater than the height of the hook portion. Since the base portion is thicker than the hook portion, the base portion tends to contribute more to the rigidity of the backsheet than the hook portion. The base portion extends in the plane direction over the entire backsheet. On the other hand, the hook portions are arranged at intervals in the plane direction, and a difference in rigidity occurs in the back sheet depending on the presence or absence of the hook portions. However, since the base portion contributes more to the rigidity of the back sheet than the hook portion, the difference in rigidity due to the presence or absence of the hook portion is less likely to contribute to the rigidity of the entire back sheet, and variations in the rigidity of the back sheet can be suppressed. . Therefore, by suppressing variations in the rigidity of the backsheet, it is possible to suppress local breakage of the hook portions, and it becomes easier to maintain the state of engagement with the worn article.

(2) Absorbent Articles According to Embodiments Absorbent articles according to embodiments will be described below with reference to the drawings. The absorbent article may be an absorbent article such as a sanitary napkin, pantiliner, breastfeeding pad, adult incontinence pad, fecal pad or sweat wipe. The absorbent article may be an article that is attached to the inside of a wearable article such as a user's underwear. In addition, in the following description of the drawings, the same or similar reference numerals are given to the same or similar parts. However, it should be noted that the drawings are schematic and the ratio of each dimension may differ from the actual one. Therefore, specific dimensions and the like should be determined with reference to the following description. In addition, there are cases where portions having different dimensional relationships and ratios are included between the drawings.

FIG. 1 is a plan view of an absorbent article according to an embodiment viewed from the skin surface side. FIG. 2 is a plan view of the absorbent article according to the embodiment viewed from the non-skin side. 3 is a cross-sectional view taken along line AA shown in FIG. 1. FIG. 4 is an enlarged view of a portion B shown in FIG. 3. FIG. 1 and 2 are plan views of the unfolded state that is not folded by the creases described below. For convenience of explanation, the hook portion is omitted in FIG. The absorbent article 1 has a front-rear direction L, a width direction W and a thickness direction T. As shown in FIG. The front-rear direction L is a direction extending from the wearer's front side (abdominal side) to the rear side (dorsal side), or a direction extending from the wearer's back side to the front side. The width direction W is a direction perpendicular to the front-rear direction L. As shown in FIG. The thickness direction T is a direction extending to the skin surface side T1 and the non-skin surface side T2. Here, the "skin side" corresponds to the side facing the wearer's skin during use. "Non-skin side" corresponds to the side facing away from the wearer's skin during use.

The absorbent article 1 has a crotch region S2, a front side region S1 and a back side region S3. The crotch region S2 is a region arranged to face the wearer's excretory opening, for example, the vaginal opening. When the absorbent article 1 is attached to the wearing article, the crotch region S2 is arranged at the crotch of the wearing article and is arranged between the legs of the wearer. The front side region S1 is positioned forward of the crotch region S2. A front edge of the front side region S1 defines a front edge of the absorbent article 1 . The rear side region S3 is located behind the crotch region S2. A rear edge of the rear side region S3 defines a rear edge of the absorbent article 1 .

A wing portion 25 may be provided in the crotch region S2. The wing portions 25 extend outward in the width direction W from the absorbent core 30 and are folded to the non-skin surface side T2 of the worn article during use. The wing portion 25 may have a topsheet 10 and a backsheet 20 . The front edge of the wing portion 25 is defined by the base of the wing portion 25, and corresponds to the portion located on the front side of the two portions recessed inward in the width direction W. As shown in FIG. A front edge of the wing portion 25 may define a boundary between the crotch region S2 and the front side region S1. The rear edge of the wing portion 25 is defined by the base of the wing portion 25 and corresponds to the rearward portion of the two portions recessed inward in the width direction W. As shown in FIG. A rear edge of the wing portion 25 may define a boundary between the crotch region S2 and the rear side region S3. In addition, in the absorbent article that does not have the wing portions 25, each of the regions obtained by dividing the absorbent article 1 into three equal parts in the front-rear direction L at the position where the length of the absorbent article 1 in the front-rear direction L is the longest. , a front side region S1, a crotch region S2 and a rear side region S3.

In addition, the outer portion in the present invention is a portion occupying a certain range in the width direction W including the outer edge in the width direction W, and the outer edge is the outer edge in the width direction W. The inner portion in the present invention is a portion occupying a certain range in the width direction W including the inner edge in the width direction W, and the inner edge is the inner edge in the width direction W. Further, the front end portion and the rear end portion in the present invention are portions occupying a certain range in the front-rear direction L including edges in the front-rear direction L, and the front end edge and the rear end edge are edges in the front-rear direction L. The outer edge includes a leading edge and a trailing edge, and the outer edge includes a leading edge and a trailing edge. In addition, the inner side is a side that includes the inner edge and extends along the front-rear direction. The outer side is a side that includes the outer edge and extends along the front-rear direction. In this specification, the term "along the front-rear direction L" means a direction having an angle of less than 45° with respect to the front-rear direction L, and the term "along the width direction W" It means a direction with an angle of less than 45° with respect to the width direction W.

The absorbent article 1 has at least a topsheet 10 , an absorbent core 30 and a backsheet 20 . The topsheet 10 is a sheet that faces the wearer's skin. The topsheet 10 is placed facing the wearer's skin during use. The topsheet 10 may be composed of a nonwoven fabric or a woven fabric having fibers. The surface sheet 10 may be composed of a liquid-permeable sheet. The topsheet 10 may be composed of a single sheet, or may be composed of a center sheet covering the center of the absorbent core 30 in the width direction W and side sheets overlapping the outer sides of the center sheet. The absorbent core 30 extends along the front-rear direction L of the absorbent article 1 . The absorbent core 30 has an absorbent material capable of absorbing moisture. Absorbent materials can include pulp and superabsorbent polymers (SAP). The absorbent core 30 may be covered with a core wrap made of tissue or the like. The absorbent core 30 may be arranged at least in the crotch region S2 and the rear region S3, and may be arranged in the front region S1, the crotch region S2 and the rear region S3. The backsheet 20 is oriented away from the wearer's skin during use and abuts the article of wear. The backsheet 20 is a liquid-impermeable sheet, and is a member positioned closest to the non-skin side of the absorbent article. The topsheet 10 and the backsheet 20 are arranged over the entire plane of the absorbent article 1 . The backsheet 20 will be described in detail later.

The absorbent article 1 may be individually wrapped with a wrapping sheet 40 before use. More specifically, by folding together the packaging sheet 40 and the absorbent article 1 in a state in which the absorbent article 1 is placed on the packaging sheet 40 (the state shown in FIGS. 1 and 2), the packaging sheet 40 The absorbent article 1 may be enclosed. The packaging sheet may be made of known materials such as films, non-woven fabrics, and woven fabrics. FIG. 5 shows the absorbent article 1 in a folded state folded around a plurality of creases. FIG. 5(a) is a plan view of the folded state, and FIG. 5(b) is a cross-sectional view along line CC shown in FIG. 5(a). The packaging sheet 40 may cover the non-skin surface side T2 of the backsheet 20 in the unfolded state and the folded state. The plurality of creases may be creases for folding the absorbent article 1 so that the skin side T1 faces each other, and may be along the front-rear direction L or along the width direction W. The absorbent article 1 of the present embodiment is folded with a first fold line FW1 and a second fold line FW2 along the width direction W as base points. The first fold line FW1 is provided on the rear side of the second fold line FW2.

Next, the backsheet 20 will be described in detail. As shown in FIG. 4, the back sheet 20 includes a base portion 21 extending in a plane direction including the front-rear direction L and the width direction W, and a hook portion projecting from the base portion 21 to the non-skin surface side T2 and engaged with the worn article. 22 and. The hook portion 22 is made of the same material and the same member as the base portion 21 and is formed continuously with the base portion 21 . The base portion 21 is a layer having a predetermined thickness, and the thickness may be constant. The base portion 21 covers the non-skin side T2 of the absorbent core 30 or the non-skin side T2 of the core wrap. The hook portion 22 may have a shaft portion 221 extending in the thickness direction T from the base portion 21 and an umbrella portion 222 extending in the planar direction from the shaft portion 221 . The umbrella portion 222 spreads in the plane direction more than the shaft portion 221 and is configured to be caught on the worn article or the topsheet. The total thickness of the backsheet 20 may be 30 μm to 100 μm, and the height of the hook portions 22 may be 10 μm to 30 μm.

According to such a configuration, the absorbent article 1 can be engaged with the worn article via the hook portion 22 projecting to the non-skin surface side T2 of the base portion 21 . When the absorbent article 1 is worn, various forces are applied to the absorbent article 1 due to leg movements and the like. At this time, since the hook portion 22 is the same member as the base portion 21 and the hook portion 22 is formed continuously with the base portion 21, the local rigidity of the connection portion between the hook portion 22 and the base portion 21 and the like is increased. It is difficult to make a low part. Therefore, when various forces are applied to the absorbent article 1 , the entire backsheet 20 receives the force, and local breakage of the hook portions 22 can be suppressed. By suppressing breakage of the hook portion 22, it becomes easier to maintain a locked state with respect to the worn article. Moreover, when the absorbent article 1 is discarded after use, it is common to roll the absorbent article 1 so that the skin surface side T1 to which excrement adheres faces the inside. When the absorbent article 1 is rolled with the skin side T1 facing inward, the topsheet 10 is arranged so as to cover the non-skin side T2 of the backsheet 20 . Since the backsheet 20 has the hook portions 22 protruding to the non-skin surface side T2, the hook portions 22 are engaged with the topsheet 10, and the absorbent article 1 can be kept rolled up. The absorbent article 1 can be kept in a rolled state when discarded, and the absorbent article 1 can be discarded cleanly by the hook part 22.例文帳に追加The absorbent article 1 needs to remain engaged with the worn article during use and be peeled off from the worn article after use. Therefore, it is preferable that the hook portion has both the engagement strength for keeping the hook on the worn article and the peel strength for easy peeling.

A plurality of hook portions 22 are arranged at intervals in the front-rear direction L, and a plurality of hook portions 22 are arranged at intervals in the width direction W. As shown in FIG. The height H22 of the plurality of hook portions 22 may be constant. Here, the constant height H22 of the hook portion 22 is a concept that includes values within ±15 μm with respect to an arbitrary height of the hook portion. That is, when the heights of the plurality of hook portions 22 are slightly different, if the difference between the height of the highest hook portion 22 and the height of the lowest hook portion 22 is 30 μm, the plurality of hook portions 22 is constant. Also, the height H22 of the hook portion 22 is the height relative to the base portion 21, as shown in FIG. In the configuration having hook portions 22 with different heights, the force applied to the hook portions 22 varies due to the difference in height, and the force is applied locally to some hook portions 22, causing some hook portions to The portion 22 may break. However, since the plurality of hook portions 22 have different heights, it is possible to suppress variations in force due to differences in height, and to suppress local breakage of the hook portions 22 due to the force received by the entire backsheet 20 .

The hook portion 22 may be arranged over the entire surface of the core arrangement region R30 overlapping the absorbent core 30 in the thickness direction T. As shown in FIG. The core placement region R30 is a region where the absorbent core 30 is arranged in a plan view shown in FIG. 1 and the like, and is a hatched region in FIG. The base portion 21 is provided on the entire surface of the back sheet 20, and the hook portions 22 are arranged at intervals. Therefore, the configuration in which the hook portions 22 are arranged over the entire core placement region R30 is not limited to the configuration in which the hook portions 22 are arranged so as to cover the entire surface of the core placement region R30. It includes a configuration in which the hook portions 22 are arranged over the entire core arrangement region R30 at regular intervals. According to such a configuration, the absorbent article 1 can be locked to the worn article via the hook portion 22 over the entire surface of the core arrangement region R30. The entire area R30 where the absorbent core 30 that absorbs body fluids is arranged is less likely to rise from the worn article, thereby suppressing problems such as unintentional adhesion of body fluids to the body and leakage of body fluids.

The hook portion 22 may be arranged on the flap portion. The flap portion is a portion that is arranged outside in the width direction W of the core arrangement region R30 and bulges outside in the width direction W. As shown in FIG. The wing portion 25 of this embodiment constitutes a flap portion. The flap portion may include a hip flap portion that bulges outward in the width direction in the rear side region S3. The flap portion, in which the absorbent core 30 is not arranged, has lower rigidity than the core arrangement region R30, and may bend when worn. However, since the hook portion 22 is arranged on the flap portion, the flap portion can also be locked to the article to be worn via the hook portion, and the flap portion can be prevented from twisting when worn.

The hook portions 22 may be arranged over the entire surface of the backsheet 20 . Here, the configuration in which the hook portions 22 are arranged over the entire surface of the back sheet 20 is not limited to the configuration in which the hook portions 22 are arranged so as to cover the entire surface of the back sheet 20, and is as in the present embodiment. It includes a configuration in which the hook portions 22 are arranged over the entire back sheet 20 at regular intervals. According to such a configuration, the backsheet 20 is arranged over the entire surface of the absorbent article 1 and the hook portions 22 are arranged over the entire surface of the backsheet 20 . The entire surface of 1 can be locked to the article to be worn.

The thickness T21 of the base portion 21 may be thicker than the height H22 of the hook portion 22 . Since the thickness T21 of the base portion 21 is thicker than that of the hook portion 22, the base portion 21 tends to contribute more to the rigidity of the back sheet 20 than the hook portion 22. The base portion 21 extends in the plane direction over the entire backsheet 20 . On the other hand, the hook portions 22 are arranged at intervals in the planar direction. Therefore, a difference in rigidity occurs in the back sheet 20 depending on the presence or absence of the hook portions 22 . However, since the base portion 21 contributes more to the rigidity of the backsheet 20 than the hook portions 22 , the difference in rigidity due to the presence or absence of the hook portions 22 hardly contributes to the rigidity of the backsheet 20 as a whole. Variation in rigidity can be suppressed. Therefore, by suppressing variations in the rigidity of the backsheet 20, it is possible to suppress local breakage of the hook portions 22, thereby making it easier to maintain the state of engagement with the worn article.

At least part of the backsheet 20 may be covered with the packaging sheet 40 in the folded state shown in FIG. The hook portion 22 may engage with the packaging sheet 40 . The packaging sheet 40 can cover the hook portion 22 before use to protect the hook portion 22 . It is possible to prevent the hook portion 22 from unintentionally engaging with the topsheet 10 or the like before use of the absorbent article 1 . In addition, compared to the conventional structure in which the absorbent article 1 is secured to the worn article with an adhesive, the adhesive and the release sheet for protecting the adhesive are not required, and the number of parts can be reduced.

In the unfolded state, the backsheet 20 may have an uncovered region NR that is not covered by the packaging sheet 40 in the unfolded state. The uncovered region NR is a partial region of the backsheet 20 and is a region not covered by the packaging sheet 40 in the unfolded state shown in FIG. In FIG. 2, the non-covered region NR is shaded. In the unfolded state, part of the backsheet 20 is covered with the packaging sheet 40 and the other part (uncovered region NR) of the backsheet 20 is not covered with the backsheet 20 . The unfolded state is a state in which the absorbent article 1 is not folded around the creases, and in the case of a form having a plurality of creases, it is a state in which none of the creases are folded. As shown in FIG. 5B, in the folded state, the hook portions 22 of the non-covered region NR may be arranged facing the topsheet 10 and may be engaged with the topsheet 10 . In the folded state, the hook portions 22 in the non-covered region NR can be covered with the topsheet 10, and the hook portions 22 other than the non-covered region NR can be covered with the backsheet 20. It is possible to prevent the hook portion 22 from unintentionally engaging with a sheet or the like before use of the absorbent article 1 . Further, in the present embodiment, the folded state is maintained by the sealing tape 45 that stops the ends of the packaging sheet 40 in the folded state. However, since the hooks 22 of the backsheet 20 engage with the topsheet 10 in the folded state, the folded state can be maintained without using the sealing tape 45 for joining the packaging sheets 40 together.

In a modified example, the backsheet 20 may be entirely covered with the packaging sheet 40 in the unfolded state. Since the entire surface of the back sheet 20 is covered with the packaging sheet 40, the hook part 22 before use can be entirely covered with the packaging sheet 40, and the hook part 22 can be protected. It is possible to prevent the hook portion 22 from unintentionally engaging with the topsheet 10 or the like before use of the absorbent article 1 .

Although the present invention has been described in detail using the above embodiments, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented with modifications and variations without departing from the spirit and scope of the invention defined by the claims. Accordingly, the descriptions herein are for the purpose of illustration and description, and are not intended to have any limiting meaning with respect to the present invention.

According to this aspect, it is possible to provide an absorbent article that suppresses breakage of the hook portion that engages with the worn article, and that facilitates maintaining the engaged state with respect to the worn article.

1: Absorbent article, 10: Top sheet, 20: Back sheet, 21: Base part, 22: Hook part, 221: Shaft part, 222: Umbrella part, 25: Wing part (flap part), 30: Absorbent core, 40: packaging sheet, FW1: first fold (fold), FW2: second fold (fold), NR: non-covered region, R30: core placement region, L: front-back direction, T: thickness direction, T1: skin surface side , T2: non-skin surface side, W: width direction

Claims (5)

a front-rear direction and a width direction;
a liquid-impermeable backsheet in contact with the worn article;
an absorbent core disposed closer to the skin than the back sheet;
a surface sheet arranged closer to the skin surface than the absorbent core,
The backsheet includes a base portion extending in a planar direction including the front-rear direction and the width direction;
and a hook portion that protrudes from the base portion toward the non-skin surface side and engages with the worn article, the absorbent article comprising:
The hook portion is the same member as the base portion and formed continuously with the base portion,
The absorbent article is individually wrapped with a packaging sheet in a folded state in which the absorbent article is folded on the basis of a plurality of folds,
In the folded state, part of the backsheet is covered with the packaging sheet,
The back sheet has an uncovered area that is not covered by the packaging sheet in an unfolded state that is not folded on the basis of the plurality of creases,
The absorbent article, wherein in the folded state, the hook portions of the uncovered region are engaged with the topsheet, and a portion of the hook portions are covered with the packaging sheet. 2. The absorbent article according to claim 1, wherein said hook portion is arranged over the entire surface of a core arrangement region overlapping with said absorbent core in the thickness direction. a flap portion disposed outside the core arrangement region in the width direction and bulging outward in the width direction;
3. The absorbent article according to claim 2, wherein said hook portion is arranged on said flap portion. The absorbent article according to any one of claims 1 to 3 , wherein the thickness of the base portion is thicker than the height of the hook portion. The hook portion has a function of locking the absorbent article to the wearing article, and a function of holding the absorbent article so that the skin surface side of the absorbent article faces inside when the absorbent article is discarded after use. The absorbent article according to any one of claims 1 to 4 , further comprising a function of locking the surface sheet in a rolled state to maintain the rolled state of the absorbent article. .

Images