JP2021083694A - Underpants type absorbent article - Google Patents

Abstract

To provide an underpants type absorbent article which has less stiffening feeling, and excellent permeability, diffusivity and liquid return prevention property of body fluid.SOLUTION: An underpants type absorbent article 1 comprises: an exterior body 30; a waist opening 11; two leg openings 12; and an absorbent body 20 arranged on an inner surface of a crotch area 14 of the exterior body 30. The absorbent body 20 comprises: a liquid permeable top sheet 24; a liquid impermeable back sheet 25; an absorber 29 arranged therebetween; and an apertured film 27 arranged between the top sheet 24 and the absorber 29. The apertured film 27 is configured so that, in a thickness direction, an aperture diameter on a top sheet side surface is relatively small, an aperture diameter on an absorber side surface is relatively large. The absorber 29 includes, as absorbent components, a cellulose acetate tow, and a high absorbent polymer carried to the cellulose acetate tow.SELECTED DRAWING: Figure 2

Description

The present invention relates to a pants-type absorbent article.

In general, absorbent articles such as light incontinence pads, pants-type disposable diapers, and tape-stopping disposable diapers include a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber placed between the two sheets. It is composed of ,. As a result, body fluids such as urine are absorbed and held by the absorber through the top sheet, and are prevented from leaking to the outside by the back sheet. Various improvements have been made to such absorbent articles in order to improve the absorbability of body fluids, improve the wearing feeling of the wearer, prevent leakage, and the like.

For example, there is a technique for improving absorption performance such as wet back and absorption rate by providing a perforated film at a predetermined position of an absorbent article. The opening area of the perforated film is the skin side surface and the non-skin side surface, and by setting the skin side> the non-skin side, the wet back and the absorption rate are improved. In view of such characteristics of the perforated film, various proposals have been made for absorbent articles using the perforated film.

For example, in Patent Document 1, a liquid-permeable top sheet and a liquid-impermeable back sheet, in which a skin contact surface layer and a non-skin contact surface layer are laminated and integrated, are arranged between them. Disclosed is an absorbent article comprising an absorber that absorbs and retains a body fluid, and the skin contact surface layer is a perforated film made of a thermoplastic resin or a non-woven fabric made of a synthetic fiber.

Patent Document 2 describes an absorber containing a super absorbent polymer (hereinafter, also referred to as "SAP") and / or fluff pulp as an absorbent component, which is arranged in contact with the absorber, and has high water resistance and high water resistance. A coating layer made of a breathable synthetic resin perforated film is provided, and the coating layer prevents the absorbing component from detaching from the absorber and maintains the morphological stability of the absorber, and the perforated film is on the crown. There is disclosed an absorber having a large number of protrusions having a funnel-like structure with a small opening and a large opening at the bottom, and the top of the head in contact with the absorber.

Further, Patent Document 3 discloses an absorber component in which a plurality of fibers of tow such as cellulose acetate tow are opened by gas and a highly absorbent polymer is fixed to the obtained tow spread by a binder. Has been done.

Japanese Unexamined Patent Publication No. 8-66425 Japanese Unexamined Patent Publication No. 2002-355271 Japanese Unexamined Patent Publication No. 2018-003206

However, in Patent Document 1 provided with the perforated film, although it is excellent in liquid return prevention property such as wet back and absorption rate, it cannot be said that it is effective in diffusivity of body fluid in an absorbent article, and the absorbent body. The absorption performance of is not fully exhibited. Further, Patent Document 2 uses an opening film having a smaller opening area on the skin side surface than the conventional non-skin side surface, and has a configuration in which the surface having a small opening area is in contact with the absorber. However, even in this case, there is no technical idea of improving the diffusivity of body fluids.

Further, in the conventional pants-type absorbent article, defibrated fluff pulp is used as the absorber. While the fluff pulp absorber is excellent in urine diffusion, it is hard due to the accumulation of defibrated fluff pulp, and there is a concern that it may rub against the skin when it hits the crotch area and damage the skin soaked with urine. .. In addition, since the fluff pulp accumulated in the absorber is hard, the absorber is twisted, and the feeling of stiffness in the crotch portion and the feeling of discomfort in the inseam become stronger. In Patent Document 3, since the spread fiber of cellulose acetate tow is softer than that of fluff pulp, a relatively soft absorber is realized. However, the absorber has a weak water-retaining power, an insufficient liquid return prevention effect, a slow liquid permeation rate, and satisfies the performance required for an absorber used for a water-absorbent article. is not it.

An object of the present invention is to provide a pants-type absorbent article having less stiffness in the crotch portion and excellent permeability, diffusibility, and anti-return property of body fluids.

As a result of diligent research in view of the above problems, the present inventor has provided a perforated film between the top sheet and the absorber, and includes a tow fiber aggregate carrying SAP as an absorbent component. We have found that the above problems can be solved by providing an absorber, and have completed the present invention. Specifically, the present invention provides the following pants-type absorbent articles (1) to (4) as a preferred embodiment.

(1) An interior non-woven sheet which constitutes the outer shape of a pants-type absorbent article and is located on the skin side of the wearer, an exterior non-woven sheet located on the non-skin side of the wearer, the interior non-woven sheet and the exterior. A plurality of elastic stretchable members arranged between the non-woven sheet, a front region mainly facing the wearer's abdomen, a rear region mainly facing the wearer's back, and the front region. In the front region and the rear region of the exterior body, which is arranged between the and the rear region and has an inseam region mainly facing the crotch portion of the wearer on the inner surface thereof. Along the waist opening provided at the end opposite to the inseam region, the two leg openings provided on both sides of the inseam region of the exterior body, and the inner surface of the inseam region of the exterior body. A pants-type absorbent article comprising an absorbent body arranged therein, wherein the absorbent body includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and the top sheet and the back sheet. The perforated film is provided with an absorber arranged between the top sheets and a perforated film arranged between the top sheet and the absorber and having a plurality of funnel-shaped perforations, and the perforated film is provided in the thickness direction. The pore diameter of the surface on the top sheet side is relatively small, and the pore diameter of the surface on the absorber side is relatively large, and the absorber is supported on the cellulose acetate tow and the cellulose acetate tow as absorption components. Pants-type absorbent articles, including highly absorbent polymers.
(2) The pants type according to (1) above, wherein the weight ratio of the cellulose acetate tow to the highly absorbent polymer (weight of the highly absorbent polymer / weight of the cellulose acetate tow) is 10% or more and 500% or less. Absorbent article.
(3) The perforated film has a numerical aperture of 2 mm or less, a numerical aperture of 50 / cm ² or more, and a basis weight of 20 g / m ² or more and 60 g / m ² or less. (4) The difference between the opening diameter of the surface on the absorber side and the opening diameter of the surface on the top sheet side is 0.03 mm or more and 0.15 mm or less. Any absorbent article.

According to the present invention, it is possible to provide a pants-type absorbent article having excellent permeability, diffusibility and anti-return property of body fluids and less feeling of stiffness in the crotch portion.

It is a perspective view which shows typically the appearance shape of the pants type absorbent article which is 1st Embodiment of this invention. It is a developed plan view which shows typically the pants type absorbent article shown in FIG. It is a schematic cross-sectional view of a second embodiment in FIG. 2 of the absorbent body in the form X ₁ -X ₁ cutting line of the present invention. It is a schematic cross-sectional view of one Embodiment of the perforated film used in this Embodiment. It is a schematic cross-sectional view of another embodiment of a perforated film.

Hereinafter, the pants-type absorbent article 1 of the present embodiment will be described with reference to the drawings. FIG. 1 is a schematic perspective view of the pants-type absorbent article 1 according to the first embodiment. FIG. 2 is a developed plan view of the pants-type absorbent article 1. FIG. 2 shows the inner surface of the pants-type absorbent article 1. Figure 3 is a schematic cross-sectional view in X ₁ -X ₁ cutting line of the absorbent main body 20 is a second embodiment (FIG. 2). FIG. 4 is a schematic cross-sectional view of the perforated film 27 used in the present embodiment in the thickness direction. FIG. 5 is a schematic cross-sectional view in the thickness direction of the perforated film 27A of another form. It should be noted that each figure does not define the size relationship of the dimensions of the constituent members such as the absorbent main body 20 and the exterior body 30 of the pants-type absorbent article 1, and the dimensions of each constituent member are the pants-type absorbent articles 1. It can be appropriately selected from a wide range according to the intended use, the age of the wearer to be used, and the like.

In the present specification, the position on the ventral side of the wearer when the pants-type absorbent article 1 is worn is also referred to as the “front side”, and the position on the back side of the wearer is also referred to as the “rear side”. The time when the pants-type absorbent article 1 is worn means a state in which the pants-type absorbent article 1 is worn on the body regardless of before, during, and after the absorption of the body fluid. The pants-type absorbent article 1 is usually worn on the body inside clothing, but may be worn on the body so that at least a part thereof is exposed to the outside. The longitudinal direction of the absorbent main body 20 and each of the constituent members provided therein is a direction extending to the front and back of the body through the crotch portion of the wearer when the pants absorbent article 1 is worn on the body. The width direction of the absorbent body 20 and each of the constituent members provided therein is a direction orthogonal to the longitudinal direction. The thickness direction of the absorbent main body 20 and each of the constituent members provided therein is a direction in which the respective constituent members are laminated. Further, the skin side surface (skin side surface) of the absorbent body 20 and each component provided therein is a surface that comes into contact with the wearer's skin and a surface that faces the skin when the pants-type absorbent article 1 is worn on the body. The non-skin side surface (non-skin side surface) is a surface that comes into contact with the wearer's clothing or a surface that faces the clothing when the pants-type absorbent article 1 is worn on the body. Body fluid refers to the liquid excreted from the body such as urine, blood, and water in loose stool.

<Pants type absorbent article>
The pants-type absorbent article 1 of the present embodiment shown in FIGS. 1 and 2 has an absorbent body 20 having a substantially band-shaped shape in the front-rear direction covering the wearer's crotch portion from the front and back, and outside the absorbent body 20. An exterior body 30 that overlaps and extends around the absorbent body 20 to form a pants-like outer shape of the pants-type absorbent article 1 is provided. The inner surface of the exterior body 30 is formed between the anterior region 13 mainly facing the wearer's abdomen, the posterior region 15 mainly facing the wearer's back (back), and the anterior region 13 and the posterior region 15. , Mainly divided into an inseam region 14 facing the wearer's crotch. The absorbent body 20 is located primarily on the inner surface of the inseam region 14, but a portion thereof extends to the anterior region 13 and / or the posterior region 15.

In the pants-type absorbent article 1 of the present embodiment, the absorbent body 20 is arranged between the liquid-permeable top sheet 24, the liquid-impermeable back sheet 25, and the top sheet 24 and the back sheet 25. A perforated film 27 arranged between the absorber 29, the top sheet 24 and the absorber 29 and having a plurality of funnel-shaped perforations, and a pair of three-dimensional gathers 26 are provided. In the thickness direction of the perforated film 27, the perforation diameter of the top sheet side surface 27a is relatively small, and the perforation diameter of the absorber side surface 27b is relatively large. The absorber 26 contains, as an absorbing component, a fiber aggregate made of tow (not shown) and a highly absorbent polymer supported on the fiber aggregate made of tow (not shown).

According to the present embodiment, by providing the perforated film 27 between the top sheet 24 and the absorber 29 in a predetermined direction, in addition to the permeation of the body fluid into the absorber 29 (thickness direction), the longitudinal direction and the width direction It is possible to provide an absorbent article 1 having excellent diffusion of body fluid into (front, back, left and right). As a result, when the absorbent body 29 is quickly wetted and spread by the body fluid when the liquid is received by urination or the like, the diffusibility and the liquid permeability are improved, and the absorbent article 1 has improved liquid return prevention property. Furthermore, by using SAP in combination with a fiber aggregate (particularly cellulose acetate tow) composed of tow as an absorbent component, the absorber 29 maintains flexibility before and after body fluid absorption, so that the absorbent article 1 itself It becomes soft and does not cause a feeling of stiffness or discomfort even if it absorbs body fluids.

The dimensions of the pants-type absorbent article 1 before disposing the elastic member in the longitudinal direction (direction indicated by the arrow Y in FIG. 2) at the time of deployment are 600 mm or more and 1000 mm or less, and the width direction (arrow X in FIG. 2). The dimension (in the direction indicated by) is preferably 450 mm or more and 900 mm or less. By setting the unfolded dimensions of the pants-type absorbent article 1 before disposing the elastic member within the above range, the pants-type absorbent articles for adults of various sizes such as S size, M size, and L size can be used. Can be provided.
Hereinafter, each component of the absorbent article 1 will be described in detail.

<Absorbable body>
As shown in FIGS. 2 and 3, the absorbent body 20 is an absorber arranged between the liquid-permeable top sheet 24, the liquid-impermeable back sheet 25, and the top sheet 24 and the back sheet 25. 29, the perforated film 27 arranged between the top sheet 24 and the absorber 29, one end in the width direction on the skin side surface of the back sheet 25, and the middle part in the width direction on the skin side surface of the top sheet 24, respectively. It includes a pair of three-dimensional gathers 26 that are fixed and have a free end in the width direction and extend to the skin-side surface of the top sheet 24. In the absorbent body 20 of the present embodiment, for example, by setting the length dimension of the absorbent body 20 to 300 mm or more and 500 mm or less and the width direction dimension to 100 mm or more and 300 mm or less, pants-type absorption for adults of various sizes It can be an absorbent body 20 that can be used for sex articles.
Hereinafter, each component of the absorbent body 20 will be described in more detail in the order of the top sheet 24, the absorber 29, the perforated film 27, and the back sheet 25.

(Top sheet)
The top sheet 24 may use a base material having liquid permeability such that the body liquid moves to the absorber 29. For example, a non-woven fabric such as a thermal bonded non-woven fabric or a composite non-woven fabric in which a thermal-bonded non-woven fabric / spunbonded non-woven fabric is laminated , An open film such as an open polyethylene film, a foam film such as polyethylene foam and urethane foam, or a composite sheet in which these are laminated. Further, the surface of the top sheet 24 is preferably embossed or perforated in order to improve the liquid permeability, and the embossing or perforation can be performed by a conventionally known method. Further, in order to reduce the irritation of the top sheet 24 to the skin, it is also preferable that the top sheet 24 contains a lotion, an antioxidant, an anti-inflammatory component, a pH adjuster, an antibacterial agent, a moisturizer and the like.

The basis weight of the top sheet 24 is preferably ^{14 g / m 2} or more and 40 g / m ^{2 or less from the viewpoint of strength and workability.} If it is less than 14 g / m ² , the top sheet 24 tends to be easily damaged during the manufacture of the absorbent body 20, and ^{if it is larger than 40 g / m 2} , the hardness of the top sheet 24 tends to be felt when it hits the skin. , In either case is not preferable. The shape of the top sheet 24 is not particularly limited, but it may be a shape that covers the absorber 29 in order to guide the body fluid to the absorber 29 so as not to leak.

<Absorbent>
As described above, the absorber 29 contains a cellulose acetate tow and a highly absorbent polymer supported on the cellulose acetate tow as an absorbing component. The dimension of the absorber 29 is not particularly limited, but the dimension of the longest width in the longitudinal direction is preferably 100 mm or more and 800 mm or less, and more preferably 150 mm or more and 500 mm or less. The length of the longest width of the absorber 29 in the width direction is preferably 50 mm or more and 500 mm or less, and more preferably 70 mm or more and 105 mm or less.

(Cellulose acetate tow with highly absorbent polymer supported)
The highly absorbent polymer used for the cellulose acetate tow on which the highly absorbent polymer is supported is not particularly limited as long as it can absorb body fluids and prevent backflow, and is a polyacrylic acid salt type or polyaspartic acid. Salt-based, (starch-acrylic acid) graft copolymer, (acrylic acid-vinyl alcohol) copolymer, (isobutylene-maleic anhydride) copolymer and those formed from materials such as saponified products are used. be able to. Among these, a polyacrylate type is preferable, and a sodium polyacrylate type is more preferable, from the viewpoint of the amount of absorption per weight. The highly absorbent polymer may be used alone or in combination of two or more.

The basis weight of the highly absorbent polymer supported on the cellulose acetate tow ^{is preferably 240 g / m 2} or more and 450 g / m ² or less, and more preferably 245 g / m ² or more and 445 g / m ² or less. By setting the value within the above numerical range, gel blocking in the absorber 29 can be prevented and a large amount of body fluid can be absorbed by the absorber 29.

The cellulose acetate tow is not particularly limited, but a spread fiber obtained by opening the cellulose acetate tow is preferable. The basis weight of the spread fiber of cellulose acetate tow is preferably 40 g / m ² or more and 90 g / m ² or less, and more preferably 45 g / m ² or more and 85 g / m ² or less. By keeping the value within the above numerical range, the absorber 29 having good shape retention can be easily mass-produced while maintaining the body fluid retention performance of the highly absorbent polymer at a high level.

In the absorber 29, the forms of the cellulose acetate tow and the SAP may be formed by mixing SAP particles in the cellulose acetate tow, or may be a SAP sheet in which the SAP particles are fixed between the cellulose acetate tow. Further, the absorber 29 may be wrapped in the carrier sheet 28 for the purpose of preventing leakage of SAP particles and stabilizing the shape of the absorber 29. The base material of the carrier sheet 28 may be any one having hydrophilicity, and examples thereof include hydrophilic non-woven fabrics such as tissue, absorbent paper, and air-laid non-woven fabric. When a plurality of carrier sheets 28 are provided, the base materials of the plurality of carrier sheets 28 may be the same or different. In the present embodiment, the absorber 29 is wrapped with the carrier sheet 28, but the present embodiment is not limited to this, and a mode in which the carrier sheet 28 is not provided is also included in the present embodiment.

Further, in the absorber 29, the weight ratio of the highly absorbent polymer to the cellulose acetate tow [(weight of the highly absorbent polymer / weight of the cellulose acetate tow) × 100 (%)] is not particularly limited, and the absorbent body 29 is not particularly limited. It is appropriately selected from a wide range depending on the application and the like, but it is preferably 10% or more and 500% or less, and more preferably 20% or more and 300% or less. If the weight ratio is less than 10%, the absorption of body fluids such as excreted urine by the absorber 29 tends to be insufficient, and if it is more than 500%, SAP is not sufficiently supported on the cellulose acetate tow. Tends to fall off and fall. Furthermore, gel blocking, which is caused by the swelling of a highly absorbent polymer that has absorbed body fluids such as urine, tends to occur. The weight ratio of the highly absorbent polymer to the cellulose acetate tow is more preferably 20% or more and 300% or less, which can sufficiently absorb the excreted body fluid such as urine and is less likely to cause gel blocking.

The shape of the absorber 29 is not particularly limited, and is, for example, a rectangular shape, an hourglass shape, an I shape, a rectangular shape with rounded four corners, an oval shape, or an elliptical shape long in one direction. And so on. The absorber 29 may be used by stacking two or more layers.

(Opening film)
In this embodiment, a perforated film 27 having a plurality of funnel-shaped perforations 27a is arranged between the top sheet 24 and the absorber 29. The perforated film 27 preferably has liquid permeability and liquid diffusivity such that body fluid moves to the absorber 29. ^{The basis weight of the perforated film 27 is preferably 20 g / m 2} or more and 60 g / m ² or less, and more preferably 23 g / m ² or more and 30 g / m ² or less from the viewpoint of strength, workability and the like. .. If it is smaller than 20 g / m ² , the film tends to break easily, and ^{if it is larger than 60 g / m 2} , the film tends to be hard to the touch.

From the viewpoint of liquid permeability, the numerical aperture 27a of the perforated film 27 (hereinafter, also referred to as “numerical aperture”) is ^{preferably 50 / cm 2} or more. When the numerical aperture is ^{less than 50 / cm 2} , the perforated film 27 tends to be hard, and the liquid permeability tends to decrease. Further, from the viewpoint of liquid diffusivity, the opening diameter is preferably 2 mm or less, more preferably 0.50 mm or more and 0.65 mm or less. If the opening diameter is smaller than 0.50 mm, the liquid permeability tends to deteriorate, and if it is larger than 0.65 mm, the strength, workability, etc. of the opening film 27 tend to decrease. The "opening diameter" is an average value obtained by photographing the opening film 27 with a 3D microscope (trade name: VR-3100, manufactured by KEYENCE CORPORATION) and measuring the diameters of three arbitrarily selected holes.
By setting the numerical aperture, opening diameter, and basis weight of the perforated film 27 within the above ranges, the perforated film 27 having excellent strength and workability, and excellent liquid permeability and liquid diffusivity can be obtained.

The material of the perforated film 27 is not particularly limited as long as it is a synthetic resin that can be formed into a film, but a polyolefin-based resin is preferable, polyethylene and polypropylene are more preferable, and polyethylene is further preferable.

The opening 27a of the opening film 27 of the present embodiment is a hole that penetrates the film in the thickness direction, and as shown in FIG. 4, the opening diameter L1 on one surface in the thickness direction is relatively small, and the other. It has a funnel-shaped internal space in which the opening diameter L2 on the surface of the film is relatively large. In the present embodiment, the top sheet 24 and the absorber 29 are arranged so that the surface on the side having the opening diameter L2 faces the absorber 29 and the surface on the side having the opening diameter L1 faces the top sheet 24. It is placed between. That is, in the conventional absorbent article, the opening film is arranged so that the opening diameter of the funnel is smaller, that is, the opening on the side of the opening diameter L1 faces the absorber side, whereas in the present embodiment. The opening film 27 is arranged so that the front and back sides are reversed and the opening on the side with the opening diameter L2 faces the absorber 29 side.

According to the present embodiment, the body fluid reaches the opening film 27 via the top sheet 24 and flows from the side having a small opening diameter (opening of diameter L1) to the side having a large opening diameter (opening of diameter L2). Therefore, the flow of body fluid is urged by the expansion of the opening diameter and not only permeates in the thickness direction of the absorber 29, but also in the surface direction of the absorber 29 in the longitudinal direction and the width direction (front-back and left-right directions). It spreads vigorously. As a result, an absorbent article 1 having excellent diffusivity and absorbability (absorption rate) of body fluid can be obtained. Further, since the opening diameter of the opening (L1) facing the top sheet 24 is smaller than that of the opening (L2) facing the absorber 29, the body fluid returns to the top sheet 24 side. Is also remarkably suppressed.

In the present embodiment, from the viewpoint of liquid diffusivity, the difference between the opening diameter L2 on one surface having a large opening diameter and the opening diameter L1 on the other surface having a small opening diameter is 0.03 mm or more and 0.15 mm or less. Is preferable. When the difference between the opening diameter L2 and the opening diameter L1 is smaller than 0.03 mm, the diffusibility of the body fluid in the width direction tends to decrease, and when it is larger than 0.15 mm, the strength and workability of the opening film 27 are reduced. Tends to decline.

The perforated film 27A shown in FIG. 5 has a plurality of ribs (or convex portions) protruding outward on one surface, and has a plurality of perforations having a perforation diameter of L1 near the top of the ribs. On the surface opposite to the surface on which the ribs are provided, there is an opening that communicates with the opening having an opening diameter of L1 and has an opening diameter of L2. Therefore, the opening having the opening diameter L1 and the opening having the opening diameter L2 are connected by a funnel-shaped internal space. Even with such a perforated film 27A, the same effect as that of the perforated film 27 can be obtained.

(Back sheet)
The back sheet 25 may be formed by using a base material having a liquid impermeable property so that the body fluid held by the absorber 29 does not wet the clothes, and the resin film or the resin film and the non-woven fabric are laminated. It is formed from a material such as a composite sheet. The non-woven fabric used for the composite sheet is not particularly limited in the manufacturing method, and for example, a plurality of the same type and / or a plurality of the same type such as spunbond non-woven fabric, melt-blow non-woven fabric, spunbond non-woven fabric / melt-blow non-woven fabric, spunbond non-woven fabric / melt-blow non-woven fabric / spunbond nonwoven fabric Examples thereof include a composite non-woven fabric in which different types of non-woven fabrics are laminated and a composite material thereof. Examples of the resin film include polyester, polyvinyl alcohol, polyethylene, polypropylene, and a composite film of polyethylene and polypropylene.

From the viewpoint of strength and workability, the basis weight of the back sheet 25 ^{is preferably 15 g / m 2} or more and 60 g / m ² or less. Further, in order to prevent stuffiness during wearing, it is preferable that the back seat 25 has breathability. In order to provide the back sheet 25 with breathability, for example, a filler may be blended in the resin film of the base material, or the back sheet 25 may be embossed. Calcium carbonate can be mentioned as the filler, and a known method can be used without limitation as the blending method. For example, a porous (breathable) resin film can be obtained by kneading the resin and the filler, forming the obtained kneaded product into a film, and removing the filler from the obtained film.

(Three-dimensional gather)
The three-dimensional gathers 26 are provided, for example, to prevent lateral leakage of body fluid excreted by the wearer of the pants-type absorbent article 1. In the present embodiment, the three-dimensional gather 26 has one end in the width direction (one edge extending in the longitudinal direction) fixed to the skin-side surface of the back sheet 25 along the longitudinal direction, and the middle portion in the width direction is both ends in the width direction of the top sheet 24. It is fixed in the vicinity of the portion along the longitudinal direction, the other end in the width direction (the other edge extending in the longitudinal direction) becomes the free end 26a, covers the periphery of both ends in the width direction of the top sheet 24, and is fixed in the width direction. It is a component member provided so as to be bendable starting from an intermediate portion. By configuring the three-dimensional gather 26 in this way, the standing property is imparted to the vicinity of the free end 13a of the three-dimensional gather 26, and the three-dimensional gather 26 can be deformed according to the wearer's body shape. In the present embodiment, one end in the width direction of the three-dimensional gather 26 is fixed to the skin side surface of the back sheet 25, but the present invention is not limited to this, and for example, one end in the width direction is fixed to the non-skin side surface of the back sheet 25. It may be fixed to a bag body composed of a top sheet 24 and a back sheet 25, or may be fixed to the skin side surface of the top sheet 24.

More specifically, the three-dimensional gather 26 is composed of, for example, a three-dimensional gather sheet (not shown) and an elastic member for three-dimensional gather (not shown) fixed to one end in the width direction of the three-dimensional gather sheet. The other end in the width direction of the sheet is fixed to the skin side surface of the back sheet 25, and the end portion in the width direction which is not fixed to the three-dimensional gather sheet of the elastic member for three-dimensional gather becomes a free end. As the three-dimensional gather sheet, a water-repellent or liquid-impermeable non-woven fabric formed of hydrophobic fibers, for example, a spunbond non-woven fabric, a melt-blow non-woven fabric, a composite non-woven fabric in which spunbond / melt-blow / spunbond is laminated, or the like is used. .. As the elastic member for three-dimensional gather, for example, a thread-like, string-like, or band-shaped member made of natural rubber, synthetic rubber, polyurethane, or the like can be appropriately used. The absorbent article 1 of the present embodiment also includes an embodiment that does not include the three-dimensional gather 26.

<Manufacturing method of absorbent body>
The method for producing the absorbent main body 20 is not particularly limited, and a conventionally known method can be adopted. For example, from the clothing side, the back sheet 25, the absorber 29, the perforated film 27, and the top sheet 24 are in that order. The top sheet 24 and the back sheet 25 are laminated and fixed by using hot melt adhesive, heat embossing, ultrasonic embossing, high frequency embossing, etc. over a part or the entire circumference, and further, the three-dimensional gather 26 is placed in a predetermined position. It can be manufactured by attaching it.

<Exterior body>
The exterior body 30 constitutes the outer shape of the pants-type absorbent article 1, and is, for example, a member formed by laminating a non-woven fabric and an elastic member. The exterior body 30 of the present embodiment is one or a plurality of elastic elastic members interposed between the exterior non-woven fabric sheet 301, the interior non-woven fabric sheet 302 on the body side of the exterior non-woven fabric sheet 301, and the exterior non-woven fabric sheet 301 and the interior non-woven fabric sheet 302. It is composed of 311, 312, and 313. The inner surface of the exterior body 30 mainly faces the anterior region 13 facing the ventral side of the wearer, the inseam region 14 mainly facing the crotch portion of the wearer, and the dorsal side (back) of the wearer mainly. It consists of three regions, the posterior region 15. Here, regarding the division of these regions, in the longitudinal direction, the region where the side seal portion 303 described later is provided (that is, the region where the leg opening portion 12 is not formed) is defined as the front side region 13 or the rear side region 15, and the side seal portion 303. The inseam region 14 is defined as a region (that is, a region forming the leg opening 12).

The exterior non-woven fabric sheet 301 has a front side region 13 and a rear side region 15 that are substantially symmetrical about the center line of the inseam region 14, and the absorbent main body 20 is also arranged substantially symmetrically about the center line. Then, the exterior non-woven fabric sheet 301 (and the absorbent main body 20) is folded in half along the center line so that the absorbent main body 20 is on the inside, and the side seal portions 303 are on both side edges of the front side region 13 and the rear side region 15. It is joined via. As a result, the exterior non-woven fabric sheet 301 and thus the exterior body 30 have an elastic waist opening 11 formed at one end in the longitudinal direction (the direction extending from the front to the rear via the wearer's crotch) and the longitudinal direction. A pair of leg openings 12 formed at the other end of the body are formed, and the pants-type absorbent article 1 is formed into a detachable pants shape as a whole.

The interior non-woven fabric sheet 302 is laminated inside the exterior non-woven fabric sheet 301 to increase the strength of the exterior body 30. Further, in addition to the exterior nonwoven fabric sheet 301 and the interior nonwoven fabric sheet 302, the exterior body 30 may be provided with an auxiliary sheet covering the peripheral edge of the absorbent main body 20, which may be laminated on the interior nonwoven fabric sheet 302. The exterior non-woven fabric sheet 301 and the interior non-woven fabric sheet 302 are non-woven fabrics such as thermal bonded non-woven fabric, air-through non-woven fabric, and spun-bonded non-woven fabric, preferably air-through non-woven fabric or spun-bonded non-woven fabric, and are made of a thermoplastic resin such as polypropylene, polyester, and polyethylene. Non-woven fabric can be used. When these non-woven fabrics are used, the basis weight thereof may be 10 g / m ² or more and 40 g / m ² or less.

The elastic elastic members 311 and 312, 313 are joined to the exterior non-woven fabric sheet 301 and the interior non-woven fabric sheet 302. It is preferable that the interior non-woven fabric sheet 302 and the elastic members 311 and 312, 313 are adhered to each other via a hot melt adhesive interposed only in each elastic member. As the elastic member, for example, a thread-like, string-like, or flat-shaped member such as natural rubber, synthetic rubber, or polyurethane can be appropriately used, and the thickness thereof is preferably 300 dtex or more and 1500 dtex or less.

<Manufacturing method of pants-type absorbent articles>
The method for producing the pants-type absorbent article 1 is not particularly limited, and a conventionally known method can be adopted. For example, the step of producing the absorbent body 20 as described above, the front region 13, the rear side, and the rear side. A step of arranging the above-mentioned elastic members 311 and 312, 313 on the exterior non-woven sheet 301 and the interior non-woven sheet 302 at the region 14 and the periphery of the leg opening 12 and joining them to the exterior non-woven sheet 301 and the interior non-woven sheet 302. , The step of arranging the absorbent main body 20 on the body side of the exterior body 30, and the step of joining both side edges of the front region 13 and both side edges of the rear region 15 via the side seal portions 303, respectively. By going through each step, the pants-type absorbent article 1 can be obtained.

Although the present invention has been described above using the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope described in the above-described embodiments and examples. It will be apparent to those skilled in the art that various changes or improvements can be made to the above embodiments. Further, it is clear from the description of the scope of claims that the form to which such a modification or improvement is added may be included in the technical scope of the present invention.

Hereinafter, the present invention will be described in detail with reference to examples. The present invention is not limited to the examples shown below.

<Example 1>
Using the absorbent component shown in Table 1 in which SAP (8.0 g) is dispersed in the opened cellulose acetate tow (basis weight 70 g / m ^{2 ), the air-through non-woven fabric (basis weight 25 g / m 2} _, long) is used as the top sheet. 42 cm long x 15 cm wide), a breathable polyethylene sheet (basis weight 32 g / m ² , 42 cm long, 15 cm wide) was used as the back sheet, and the perforated film shown in Table 1 was used to make 42 cm long and 15 cm wide. A 15 cm absorbent body (urine absorbing pad) was prepared.

<Examples 2 to 6 and Comparative Examples 1 to 6>
An absorbent main body (urine absorbing pad) was prepared in the same manner as in Example 1 except that the absorbing component and the perforated film shown in Table 1 were used. In Comparative Example 6, as shown in Table 1, fluff pulp (basis weight 500 g / m ² ) was used instead of cellulose acetate tow.

Each absorbent body of Examples 1 to 6 and Comparative Examples 1 to 6 and each absorbent body of Examples 1 to 6 and Comparative Examples 1 to 6 having the same structure of the exterior body. Performance evaluation and sensory evaluation were carried out on the article. The results are shown in Table 1. The evaluation method is as follows.

(Absorption rate 3 times method)
A measuring jig having a hole with an inner diameter of 19 mm and a weight of 755.6 g was placed in the center of a cylinder having a bottom area of 16.8 cm ^{2 and placed on the central portion in the longitudinal direction and the width direction of the absorbent article.} 20 ml of each saline solution was dropped from the upper hole, and the time was measured from the time when the saline solution came into contact with the absorbent article, starting from the point where the liquid was completely sucked into the circumference inside the center circle of the jig (1). Second time). Then, after 3 minutes had elapsed, the same time was measured (second time), and the third time was measured in the same manner.

(Liquid return amount)
With the top sheet facing up, 120 ml of physiological saline was poured toward the center of the absorber, left for 10 minutes, and then weighed in advance on the physiological saline absorption site (manufactured by ADVANTEC). No. 2 filter paper (diameter 55 mm) was placed, ^{a weight of 35 kgf / cm 2} was placed on it, and after 30 seconds had passed, the weight of the filter paper was measured, and the weight difference of the filter paper was taken as the amount of liquid return.

(Wet spreadability)
With the top sheet 24 facing up, 120 ml of physiological saline is poured toward the center of the absorber 29, and the time until the physiological saline spreads 10 cm in the longitudinal direction of the product from the absorption site is measured and wet and spread. Gender was evaluated.

(Total absorption amount)
A 1.5 L saline solution was prepared, the sample was immersed therein with the top sheet facing down, and then left for 10 minutes, and the weight difference of the sample before and after the immersion was taken as the total absorption amount.

(Mannequin inseam length)
A commercially available mannequin having an inseam length of 70 mm only for the lower abdomen was prepared, each absorbent body was attached to the crotch part, placed on a flat laboratory table, and the length from the laboratory table to the absorbent body was evaluated.

(Touch of absorbent articles)
Eight panelists evaluated the feel of the absorbent article. The absorbent article was touched and evaluated according to the following criteria.
〇: The number of evaluators who felt soft was 6 or more and 8 or less.
Δ: The number of evaluators who felt soft was 3 or more and 5 or less.
X: There are one or two evaluators who feel soft, or none of them feel soft.

(Overall evaluation)
The total absorption rate is 60 seconds or less, the wettability is 13 seconds or less, the liquid returnability is 0.3 g or less, the total absorption amount is 150 g or more, the inseam length of the mannequin is evaluated to be 63 mm or more, and the absorbable article feels soft to the touch. When the evaluation was ◯, the judgment was “○”, and when the above was not satisfied, the judgment was “×”.

In Examples 1 to 6, the liquid diffusivity was excellent, the absorption rate was high due to the influence, and the result was soft due to the influence of the cellulose acetate tow, and there was little discomfort in the inseam. On the other hand, in Comparative Example 1, since the amount of highly absorbent polymer is small, the total absorption amount assuming the absorption capacity of urine is low, and in Comparative Example 2, since the amount of high absorbable polymer is large, the total absorption amount is high but the absorption rate. Was a slow result. Further, in Comparative Example 3, the liquid diffusivity was poor and the absorption rate was low due to the influence that the large-perforated side of the perforated film was facing the top sheet side. In Comparative Example 4, the absorption rate was slow and the amount of liquid returned was large due to the absence of the perforated film. In Comparative Example 5, urine was rapidly transferred to the absorber due to the large opening diameter of the perforated film, but gel blocking also occurred, and the absorption rates of the second and third times were slowed down. In Comparative Example 6, fluff pulp was used as the absorber, the absorber was hard, and when the mannequin was put on the mannequin, the crotch portion was strongly stiff, and as a result, the inseam length was shortened.

1 Pants-type absorbent article 11 Waist opening 12 Leg opening 13 Front area 14 Inseam area 15 Rear area 20 Absorbent body 24 Top sheet 25 Back sheet 26 Three-dimensional gather 27, 27A Perforated film 28 Carrier sheet 29 Absorbent 30 Exterior body 301 Exterior non-woven sheet sheet 302 Interior non-woven sheet sheet 303 Side seal part 311 Waist area elastic member 312 Front side waist area elastic member 313 Rear side waist area elastic member 314 Leg circumference elastic member

Claims (4)

The interior non-woven sheet which constitutes the outer shape of the pants-type absorbent article and is located on the skin side of the wearer, the exterior non-woven sheet located on the non-skin side of the wearer, the interior non-woven sheet and the exterior non-woven sheet. Including a plurality of elastic elastic members arranged between the above, the anterior region mainly facing the abdomen of the wearer, the posterior region mainly facing the back of the wearer, the anterior region and the posterior region. An exterior body arranged between the side regions and having an inseam region mainly facing the crotch portion of the wearer on its inner surface, the anterior region of the exterior body, and the inseam region in the posterior region. A waist opening provided at the opposite end, two leg openings provided on both sides of the inseam region of the exterior, and arranged along the inner surface of the inseam region of the exterior. It is a pants-type absorbent article equipped with an absorbent body.
The absorbent body is between a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorber arranged between the top sheet and the back sheet, and between the top sheet and the absorbent body. The perforated film is provided with a perforated film having a plurality of funnel-shaped perforations, and the perforated film has a relatively small opening diameter on the surface on the top sheet side in the thickness direction, and is on the surface on the absorber side. The opening diameter is relatively large,
The absorbent body is a pants-type absorbent article containing cellulose acetate tow and a highly absorbent polymer supported on the cellulose acetate tow as an absorbent component. According to claim 1, the weight ratio of the fiber aggregate composed of the tow to the highly absorbent polymer (weight of the highly absorbent polymer / weight of the fiber aggregate composed of the tow) is 10% or more and 500% or less. The described pants-type absorbent article. The absorbent article according to claim 1 or 2, wherein the perforated film has a perforation diameter of 2 mm or less, a numerical aperture of 50 per cm ² or more, and a basis weight of 20 g / m ² or more and 60 g / m ^{2 or less.} .. The absorbent article according to any one of claims 1 to 3, wherein the difference between the opening diameter of the surface on the absorber side and the opening diameter of the surface on the top sheet side is 0.03 mm or more and 0.15 mm or less. ..

Images