JP2019165885A - Absorbent articles - Google Patents

Abstract

Provided is an absorbent article that allows swelling of an absorbent core during body fluid absorption and can maintain a compact shape. An absorbent article including an absorbent body including an absorbent core including an absorbent material that swells by absorbing a liquid, and a core wrap sheet enclosing the absorbent core. The core wrap sheet is a swelling portion that can define a space that allows swelling of the absorbent material, and faces the core wrap sheet among sheets constituting the absorbent article. And the absorbent core, which is accommodated in a folded state between the sheet and the absorbent core. [Selection diagram] FIG.

Description

  The present invention relates to an absorbent article for suppressing breakage of a core wrap sheet and a top sheet during body fluid absorption.

  Conventionally, absorbent articles such as disposable diapers (hereinafter also simply referred to as “diapers”) in which discharged body fluid (hereinafter also simply referred to as “body fluids”) is guided to an absorber and absorbed are widely known. The absorbent body is obtained by wrapping an absorbent core mainly composed of pulp and a super absorbent polymer (hereinafter also referred to as “SAP”) with a core wrap sheet such as tissue or nonwoven fabric. This SAP swells when it absorbs body fluids, and the swelling causes the core wrap sheet that wrapped the absorbent core to stretch, and accordingly the top sheet and back sheet are stretched. It becomes a state that is easy to destroy. When the core wrap sheet, the top sheet, or the back sheet is destroyed, the SAP may pop out, and the absorbency may decrease or the texture may be impaired.

  Therefore, for example, in Patent Document 1, the core wrap sheet that wraps the absorbent core is extended outward in the width direction, and the core at the time of bodily fluid absorption is allowed by allowing the absorbent core to swell in the extended portion. An absorptive article that suppresses destruction of a lap sheet or a top sheet is disclosed.

Japanese Patent No. 5712621

  However, in the absorbent article described in Patent Document 1, since the core wrap sheet is extended outward in the width direction, the length in the width direction of the sheet member sandwiching the core wrap sheet will also increase. This may lead to an increase in the size of the absorbent article and increase the product cost. For this reason, there is room for improvement in an absorbent article for coping with swelling of the absorbent core during body fluid absorption.

  An object of the present invention is to provide an absorbent article that allows swelling of an absorbent core during absorption of body fluid and can maintain a compact shape.

  An absorbent article according to the present invention comprises an absorbent core configured to include an absorbent core that swells by absorbing liquid, and a core wrap sheet that wraps the absorbent core. The core wrap sheet is a swelling allowing portion capable of defining a space allowing swelling of the absorbent material, and the core wrap sheet among the sheets constituting the absorbent article. The sheet is configured to include a swelling allowing portion accommodated in a folded state between the sheet facing the sheet and the absorbent core.

  According to the present invention, since the core wrap sheet defines a space that allows the absorbent material to swell, the core wrap sheet and the top sheet can be made less likely to be destroyed when the absorbent core absorbs body fluid. Further, since the core wrap sheet is accommodated in a folded state, the size of the absorbent article can be suppressed to a size that is not much different from that of the conventional product, and the product cost can be reduced.

In the external appearance of an example of the diaper which concerns on 1st Embodiment of this invention, it is the perspective view seen from the front side. It is a disassembled perspective view of the diaper shown in FIG. It is the top view which looked at the diaper of an extension state concerning a 1st embodiment of the present invention from the top sheet side. It is the top view which looked at the absorber based on 1st Embodiment of this invention from the top sheet side. It is sectional drawing of the diaper which concerns on 1st Embodiment of this invention, (a) is VV direction sectional drawing in FIG. 3, (b) is an enlarged view of the swelling permission part shown to (a). It is a schematic diagram for demonstrating a mode which accept | permits the swelling of the absorptive core after bodily fluid absorption based on 1st Embodiment of this invention, (a) is an absorber before absorbing bodily fluid, (b) is The absorber after absorbing a bodily fluid is shown. FIG. 5 is a cross-sectional view in the VV direction in FIG. 3 according to the second embodiment of the present invention.

  An embodiment of an absorbent article according to the present invention will be described in detail with reference to FIGS. 1 to 7. However, the present invention is not limited to the aspect of the present embodiment. In the claims, the specification, or the drawings, the direction extending from the abdomen side of the wearer of the absorbent article to the back side through the crotch 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 adhesive article is the thickness direction. These longitudinal direction, width direction, and thickness direction 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, a first embodiment in which the present invention is applied to a deployable disposable diaper will be described below.

<First Embodiment>
<Main configuration of diapers>
FIG. 1 shows a perspective view of an example of a diaper according to the first 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 includes a front body region 10F, a back body region 10R, and a crotch region 10C that connects the front body region 10F and the back body region 10R. Moreover, the waist periphery opening part 10W which surrounds a wearer's waist part with the front body area | region 10F and the back body area | region 10R at the time of wear is formed. Similarly, a pair of left and right leg openings 10L that surround the thighs of the wearer's legs are formed by the lower ends of the front body region 10F and the back body region 10R and the crotch region 10C.

  When worn, the front body region 10F is positioned on the wearer's ventral side, and the back body region 10R is positioned on the wearer's back side. The crotch region 10C covers the wearer's crotch when worn, and the wearer's legs are respectively passed through the pair of left and right leg openings 10L. Therefore, the leg-hole opening 10L is located anywhere from the base of the wearer's legs to around the thigh.

  The imaginary line P extends through the crotch part from the abdomen side to the back side in the central part of the diaper. Specifically, for example, if the imaginary line P is defined with the waist side of the diaper as the upper side and the crotch side as the lower side, the phantom line P extends along the diaper surface and in the vertical direction, and passes through the crotch part on the back side. Also extends in the vertical direction.

  The left and right end edges of the back body region 10R of the cover sheet 11 positioned outside the diaper 10 are overlapped with the left and right end edges of the front body region 10F when worn, and are connected to form a leg opening 10L. A pair of left and right fastening tapes 10A to be obtained is bonded. The fastening tape 10A is bonded to the front patch sheet 10B adhered on the cover sheet 11 in the front body region 10F so as to be repeatedly peelable.

  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 extended 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 partially broken for convenience of explanation.

  As shown in FIG. 2, the diaper 10 according to the present embodiment includes, in order from the outside, a cover sheet 11 formed of a thin nonwoven fabric in order to obtain a good touch, and a back sheet (back sheet) having liquid impermeability. 12, an absorbent body 13, a liquid-permeable top sheet (surface sheet) 14, and a pair of side sheets 15.

  A pair of notches 11N that are respectively leg openings 10L are formed on the left and right sides of the crotch region 10C of the cover sheet 11. Between the cover sheet 11 and the pair of side sheets 15, a pair of rubber threads 16 for forming a leg gather is bonded in an extended state.

  The top sheet 14 is composed of a nonwoven fabric having liquid permeability. The back sheet 12 is bonded to the cover sheet 11, and the absorber 13 is disposed between the back sheet 12 and the top sheet 14, and the top sheet 14 is bonded to the back sheet 12 through the absorber 13. . That is, the diaper 10 of the present embodiment includes a top sheet 14 on the skin contact side and a back sheet 12 on the non-skin contact side, which are arranged so as to sandwich the absorber 13 from above and below. Moreover, in the diaper 10 of this embodiment, the skin contact surface side of the absorber 13 is covered with the top sheet 14, and the skin non-contact side of the absorber 13 is covered with the back sheet 12. Further, in the backsheet 12, an area corresponding to the upper end portion of the back body area 10 </ b> R extends along the width direction of the backsheet 12, and is elastic for giving a wearer an appropriate wearing feeling around the waist. Sheet 10D is joined.

  The absorbent body 13 of the present embodiment located under the top sheet 14 is composed of an absorbent core 17 composed of an absorbent material such as SAP that swells mainly by absorbing pulp and liquid. It is wrapped with a core wrap sheet 18 such as. The core wrap sheet 18 includes an upper layer core wrap sheet 18a and a lower layer core wrap sheet 18b that wraps the absorbent core 17 from above and below, as shown in FIG. 2 and FIG. 5 described later. In the present embodiment, the core wrap sheet 18 has a configuration of two sheets, but in the present invention, the core wrap sheet may have a configuration of three or more. Moreover, the upper layer core wrap sheet 18a may be an integral structure or a plurality of sheets.

  The upper layer core wrap sheet 18a has hydrophilicity. Here, the term “hydrophilic” refers to the property that the liquid surface and the solid surface have a small contact angle, and generally refers to a property smaller than 90 °. For example, desired hydrophilicity can be imparted by applying a hydrophilic treatment to the upper core wrap sheet 18a and the lower core wrap sheet 18b. On the other hand, “hydrophobic” refers to the property of a large contact angle between the liquid surface and the solid surface, and generally refers to a property greater 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 penetrates into the upper layer core wrap sheet 18a having a hydrophilic skin contact side, and is promptly guided to the absorbent core 17, while the core wrap sheet 18 is not in contact with the skin. It is possible to achieve a liquid-stop effect on the surface side. In the present invention, the lower core wrap sheet 18b may be hydrophobic.

  Although details will be described later in the present embodiment, the core wrap sheet 18 is configured to include a swelling allowing portion 20 that can define a space allowing swelling of the absorbent material.

  As shown in FIG. 4 to be described later, the absorbent body 13 of the present embodiment is divided into a back body part M1, a crotch part M2, and a front body part M3. A pair of cutout portions 17N having an arc shape is formed at a portion corresponding to the crotch portion M2 of the absorbent core 17 so as to correspond to the pair of leg-hole openings 10L. As a result, the absorbent core 17 has an hourglass shape. In the present invention, the shape of the absorbent core 17 is not limited thereto, and may be an elongated shape in the longitudinal direction so as to extend from the front body, the crotch, and the back body, and the lengths in the longitudinal direction and the width direction may be long. Various shapes such as a substantially square shape, a shape in which the corners in the longitudinal direction are rounded down, an elliptical shape extending in the longitudinal direction, and a circular shape may be used.

  In the present embodiment, a pair of hydrophobic side sheets 15 forming a three-dimensional gather are provided on the left and right side edges in the width direction of the top sheet 14. The pair of side sheets 15 is a member that rises along the left and right side edges of the absorbent body 13 when worn, and prevents lateral leakage of the discharged body fluid. Cutout portions 15N are formed at the outer edge portions of the pair of side sheets 15 in the same shape as the pair of cutout portions 11N of the cover sheet 11. In each of the pair of side sheets 15, a rubber thread 19 as a three-dimensional gather stretchable material is arranged in an expanded state in a form in which the inner edge portion is folded and gripped toward the absorber 13. The pair of side sheets 15 rises toward the wearer's skin contact direction when the rubber thread 19 contracts. The three-dimensional gather can employ a known configuration used in conventional disposable diapers. For example, it can be formed by sandwiching and fixing a stretched three-dimensional gather elastic material between the layers of the water repellent sheet.

<Swellable part>
FIG. 4 is a plan view of the absorber 13 as viewed from the top sheet 14 side according to the present embodiment. 5 is a cross-sectional view of the diaper 10 according to the present embodiment, FIG. 5 (a) is a cross-sectional view in the VV direction in FIG. 3, and FIG. 5 (b) is a swelling allowance shown in FIG. FIG.

  In the present embodiment, as described above, the core wrap sheet 18 has the swelling allowing portion 20. As shown in FIG. 5A, the swelling allowing portion 20 includes sheets 12, 14 facing the core wrap sheet 18 among the back sheet 12 and the top sheet 14 constituting the diaper 10, and the absorbent core 17. , And is housed in a folded state. The swelling allowance part 20 is formed by giving the core wrap sheet 18 more margin than the part that wraps the absorbent core 17. In the present embodiment, the swelling allowing portion 20 has a so-called gusset shape. When the swelling allowing portion 20 is accommodated in a folded state, the absorbent body 13 is accommodated in the space between the top sheet 14 and the back sheet 12 with almost no gap.

  As shown in FIG. 5A and FIG. 5B, the upper core wrap sheet 18a is a pair of second cores folded inward along the longitudinal direction in the vicinity of the widthwise end of the absorbent core 17. The lower core wrap sheet 18b has a pair of second folded portions 18fb that are folded inward along the longitudinal direction in the vicinity of the end portion in the width direction of the absorbent core 17. Further, the swelling allowing portion 20 includes a joint portion 21 that joins the first folded portion 18fa and the second folded portion 18fb to each other at the inner end in the width direction, the first folded portion 18fa, and the second folded portion 18fb. And the non-joining part 22 which is not joined. As illustrated in FIG. 5B, the non-joining portion 22 is disposed on the outer side in the width direction from the position where the joining portion 21 is formed.

  4 and FIG. 5A, L is the length in the width direction of the absorbent body 13, and L1 is the first folded portion 18fa (or the second folded) on the left side of the core wrap sheet 18 from the widthwise end on the left side of the absorbent body 13. Part 18fb) to the end, L2 is the length from the widthwise end on the right side of the absorber 13 to the end of the first folded part 18fa (or the second folded part 18fb) on the right side of the core wrap sheet 18, Respectively. In demonstrating the effects of the present invention, the preferable ranges of the lengths L, L1, and L2 are the length L of 80 mm to 150 mm and the lengths L1 and L2 of 10 mm to 30 mm. In the present embodiment, the lengths L1 and L2 are equal. However, in the present invention, the length is not limited to this, and may be different from each other.

  FIG. 6 is a schematic diagram for explaining a state in which swelling of the absorbent core 17 after absorption of bodily fluid according to the present embodiment is allowed, and FIG. 6 (a) shows the absorbent body 13 before absorbing bodily fluid, FIG. 6B shows the absorbent body 13 ′ after absorbing the body fluid.

  As shown in FIG. 6A and FIG. 6B, it is understood that swelling of the absorbent core 17 ′ after absorption of body fluid is allowed in the swelling allowing portion 20.

  Conventionally, when SAP absorbs bodily fluids, it swells, and when the core wrap sheet, top sheet, and back sheet that have wrapped the absorbent core are stretched by the swelling, and the stretched portion is destroyed, SAP pops out and absorbs power. In view of the possibility of lowering or damaging the texture, for example, in Patent Document 1, the core wrap sheet that wraps the absorbent core is extended to the outside in the width direction, and in the extended portion, the absorbency is increased. An absorbent article is disclosed in which the core wrap sheet and the top sheet are prevented from being broken during body fluid absorption by allowing the core to swell.

  However, in the absorbent article described in Patent Document 1, since the core wrap sheet is extended outward in the width direction, the length in the width direction of the sheet member sandwiching the core wrap sheet will also increase. This may lead to an increase in the size of the absorbent article and increase the product cost.

  According to this embodiment, since the core wrap sheet 18 defines a space that allows the absorbent material to swell, the core wrap sheet 18 and the top sheet 14 may be less likely to be destroyed when the absorbent core 17 absorbs body fluid. It becomes possible. Moreover, since the core wrap sheet | seat 18 is accommodated in the folded state, the size of the diaper 10 can be suppressed to a size that does not change much compared with the conventional product, and the product cost can be reduced. Furthermore, it is possible to improve the absorption performance while maintaining the performance of the conventional diaper, and to promote the prevention of SAP leakage during body fluid absorption.

Second Embodiment
In the second embodiment of the present invention, unlike the first embodiment, the swelling allowed portion 20 ′ is formed by making the portion where the core wrap sheet 18 is folded into a bellows shape. With this configuration, it is possible to allow swelling of the absorbent core after absorption of body fluid.

  7 is a cross-sectional view in the VV direction in FIG. 3 according to the present embodiment. Among the elements constituting the absorbent article according to the present embodiment, those having the same function are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted.

  According to the present embodiment, similarly to the first embodiment, it is possible to make the core wrap sheet 18 and the top sheet 14 less likely to be broken when the absorbent core 17 absorbs body fluid, and the size of the diaper 10 is conventionally reduced. It is possible to reduce the product cost by suppressing the size to be not much different from that of the product. Furthermore, as in the first embodiment, it is possible to improve the absorption performance while maintaining the performance of the conventional diaper, and to promote the prevention of SAP leakage during body fluid absorption.

<Others>
The present invention is not limited to the above-described embodiments and modifications described anywhere, and appropriate modifications and variations can be made without departing from the technical idea of the present invention.

  For example, the structure of the diaper according to each of the above-described embodiments or modifications thereof is not limited to the unfolded type as described above, and is even a diaper including the configuration of the absorbent article defined in the claims. Any configuration may be used. For example, the present invention can be applied to a pants-type disposable diaper, a urine pad, and the like.

  In addition, each of the above-described embodiments or modifications thereof are not limited to diapers for infants but can be applied to various absorbent articles such as diapers for adults and urine pads.

  Further, in each of the above-described embodiments or modifications thereof, the swelling allowance portion is formed by using the two core wrap sheets 18 of the upper layer core wrap sheet 18a and the lower layer core wrap sheet 18b. Instead, the swelling allowing portion may be formed by one core wrap sheet or three or more core wrap sheets. In the case of a single core wrap sheet, for example, the effect of the present invention of allowing the absorbent core 17 to swell is realized by forming the swelling allowance portion only on one side in the vicinity of both ends in the width direction of the absorbent body 13. Can be done. Moreover, in each said embodiment or its modification, although the swelling allowance part is provided in the both ends vicinity of the width direction of the absorber 13, it is not this limitation in this invention, For example, the core wrap sheet | seat 18 is an upper layer core. When the wrap sheet 18a and the lower layer core wrap sheet 18b are formed in two layers, the upper layer core wrap sheet 18a is folded in the vicinity of the center in the width direction on the skin contact surface side (or skin non-contact surface side) of the absorbent body 13. A swelling allowance portion may be provided by forming the portion.

L Length in the width direction of the absorber L1 Length from the width direction end on the left side of the absorber to the end of the folded portion on the left side of the core wrap sheet L2 A folded portion on the right side of the core wrap sheet from the width direction end on the right side of the absorber Length M1 Back end part M2 Inseam part M3 Front body part 10 Diaper 10A Fastening tape 10B Front patch sheet 10F Front body area 10R Rear body area 10C Inseam area 10W Waist opening 10L Leg opening 11 Cover Sheet 11N, 15N, 17N Notch 12 Back sheet (Back sheet)
13 Absorbent body 14 Top sheet (surface sheet)
15 Side sheet 16, 19 Rubber thread 17 Absorbent core 18 Core wrap sheet 18a Upper layer core wrap sheet 18b Lower layer core wrap sheet 18fa First folded part 18fb Second folded part 20, 20 'Swelling allowance part 21 Joint part 22 Non-joint part

Claims (5)

An absorbent article comprising an absorbent core comprising an absorbent core that swells by absorbing liquid and a core wrap sheet that wraps the absorbent core,
The core wrap sheet is a swelling allowing portion capable of defining a space allowing swelling of the absorbent material, and is a sheet facing the core wrap sheet among sheets constituting the absorbent article; An absorbent article comprising a swelling allowing portion accommodated in a folded state between the absorbent core and the absorbent core. Further comprising a longitudinal direction from the wearer's belly side to the back side through the crotch, and a width direction orthogonal to the longitudinal direction,
The core wrap sheet is configured to include an upper layer core wrap sheet and a lower layer core wrap sheet wrapped around the absorbent core,
The upper layer core wrap sheet has a pair of first folded portions that are folded inward along the longitudinal direction in the vicinity of the end in the width direction of the absorbent core,
The lower layer core wrap sheet has a pair of second folded portions folded inward along the longitudinal direction in the vicinity of the widthwise end of the absorbent core,
The swelling allowing portion includes a joining portion that joins the first folded portion and the second folded portion to each other at an inner end in the width direction, and the first folded portion and the second folded portion are joined to each other. The non-joining part which is not carried out, and is arranged including the non-joining part arranged on the outside of the width direction rather than the position where the joint part was formed. Absorbent articles. The upper core wrap sheet has hydrophilicity,
The absorbent article according to claim 2, wherein the hydrophilicity of the lower core wrap sheet is lower than that of the upper core wrap sheet.   The said swelling permission part is formed by giving the margin more than the part which wraps the said absorptive core with respect to the said core wrap sheet | seat, The any one of Claims 1-3 characterized by the above-mentioned. Absorbent article as described in 1. The skin contact side surface sheet and the skin non-contact side back sheet arranged to sandwich the absorber are further provided,
The said absorber is accommodated in the space between the said surface sheet and the said back surface sheet | seat substantially without gap when the said swelling permission part is accommodated in the said folded state. The absorbent article as described in any one of 4.

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