JP6586680B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article.

  In general, absorbent articles such as light incontinence pads, urine-absorbing pads, disposable diapers, sanitary napkins, etc. are disposed between a liquid-permeable top sheet, a liquid-impermeable back sheet, and both sheets. And an absorber. As a result, body fluids such as urine and sweat are absorbed by the absorbent body through the top sheet and are not leaked to the outside by the back sheet. The top sheet of such an absorbent article is required to have a soft touch before absorption of bodily fluids, and after absorption, bodily fluids do not reverse and do not give a serious discomfort.

  Therefore, in order to improve the feel of the surface and the dryness after absorption, the top sheet is subjected to a shaping process such as embossing on the surface. For example, Patent Document 1 discloses an absorbent article that includes a top sheet that is shaped into a predetermined concavo-convex shape on the upper layer of two upper and lower layers of nonwoven fabric and laminated and joined.

  Further, Patent Document 2 discloses an absorption in which an upper layer and a lower layer are partially bonded to a surface (top) sheet having upper and lower two-layer sheets to form an uneven shape, and the uneven shape and the arrangement of the joints are defined. A top (top) sheet for a functional article is disclosed.

  Furthermore, Patent Document 3 has a top sheet composed of two upper and lower layers, has a convex portion that protrudes toward the upper layer while holding a cavity between the two layers, and has an upper layer and a lower layer. Absorbent articles having different fiber lengths are disclosed.

JP 2003-275239 A JP 2004-174234 A JP 2009-131593 A

  However, in order to improve the surface feel and dryness after absorption, when the shaping process is performed on the surface of the top sheet, the top sheet becomes hard due to a large number of adhesive portions formed by the shaping process. Could get worse. Moreover, it turned out that an adhesion part becomes a cause of wrinkles of a top sheet, and as a result, absorption performance falls.

  The present invention has been made in view of the above problems, and is an absorbent article having a top sheet that is improved in sheet hardness and wrinkle formation and is excellent in touch and surface dryness after absorption while shaping. The purpose is to provide.

(1) One aspect according to the present invention is an absorbent article, which is disposed between a liquid-permeable top sheet, a liquid-impermeable back sheet, and the top sheet and the back sheet. An absorbent body, and the top sheet includes a first top sheet and a second top sheet provided closer to the non-skin contact surface than the first top sheet, and the first top sheet includes: The first top sheet includes a first joint portion that is convex toward the skin contact surface side in a cross-sectional view and formed in a substantially hexagonal shape in a plan view, and a second joint portion that is formed in a substantially pentagonal shape. A region that is partially joined and that is surrounded by each joint is convex toward the skin contact surface side, and each joint shares at least a part of a side with another joint that is adjacent to each other. When two sides intersect at the first point, each joint is Starting from one point, there are dot-like joints along each side, and when three sides intersect at the second point, each joint starts from the second point on each side. A substantially Y-shaped joint point is provided, and the dot-shaped joint point is provided in the vicinity of the midpoint of each side of the first joint portion.
(2) The absorbent article according to another aspect of the present invention, (1) The absorbent article according convex region surrounded by the first joined section and the second joined section is 20 mm ² or more 200 mm ² It has the following bottom area.
(3) An absorbent article according to another aspect of the present invention is the absorbent article according to the above (1) or (2), wherein a joint point between the first joint portion and the second joint portion is second. The total area of the top sheet is 2% or more and 5% or less.
(4) The absorbent article which concerns on the other side surface of this invention is an absorbent article in any one of said (1) to (3), Comprising: The said 1st top sheet and / or the said 2nd top sheet are It is a short fiber thermal bond nonwoven fabric having a basis weight of 20 g / m ² or more and a fineness of 1.3 dtex or more and 5.0 dtex or less.

  The absorbent article of the present invention can provide an absorbent article having a top sheet that is improved in sheet hardness and wrinkle formation and is excellent in touch and surface dryness after absorption while shaping. Is.

It is a top view of one embodiment of an absorptive article of the present invention. It is sectional drawing of the absorbent article in the A-A 'line | wire of FIG. Fig.3 (a) is the top view which extracted the 1st top sheet which concerns on one Embodiment of the absorbent article of this invention. FIG. 3B is an enlarged plan view showing a part of the joint. 4A is a cross-sectional view of the top sheet taken along line XX ′ of FIG. 3A, and FIG. 4B is the top sheet taken along line X2-X2 ′ of FIG. 3A. It is sectional drawing which extracted.

  With reference to FIGS. 1-4, the absorbent article which concerns on embodiment of this invention is demonstrated in detail. In the description of the embodiments, the same numbers are assigned to the same elements throughout. In the description of the present specification, the body fluid refers to a liquid discharged from the body such as urine, blood, and water in loose stool. Furthermore, the time when the absorbent article is worn means at least one of the time when the absorbent article is worn and after the wear. In addition, in description of this specification, the longitudinal direction of an absorbent article is a direction over a wearer's front and back when an absorbent article is worn, and may be shown with the code | symbol Y in a figure. Moreover, the width direction of an absorbent article is a direction transverse or orthogonal to the longitudinal direction, and may be indicated by a symbol X in the figure.

  Examples of the absorbent article according to the embodiment of the present invention include a light incontinence pad, a panty liner, a paper diaper, a paper diaper liner, and a sanitary napkin, but are not limited thereto, and other absorbent articles. It may be.

  FIG. 1 is a plan view of an embodiment of the absorbent article of the present invention, and FIG. 2 is a cross-sectional view of the absorbent article taken along the line A-A ′ of FIG. 1. As shown in FIGS. 1 and 2, the absorbent article 1 includes a liquid-permeable top sheet 2 disposed on the skin contact surface side, and a liquid-impermeable back disposed to face the top sheet 2. The sheet | seat 3 and the absorber 4 arrange | positioned between the top sheet 2 and the back seat | sheet 3 are provided. Thereby, the absorber 4 has a structure sandwiched between the top sheet 2 and the back sheet 3. Further, for example, in order to form a confinement space for bodily fluids and stool and prevent side leakage thereof, the three-dimensional gather sheet 7a and the three-dimensional gather elastic member disposed along the free end of the three-dimensional gather sheet 7a And a three-dimensional gather 7 including 7b.

(Top sheet)
Fig.3 (a) is the top view which extracted the 1st top sheet which concerns on one Embodiment of the absorbent article of this invention, FIG.3 (b) is an enlarged plan view which shows a part of junction part. . In addition, the circular broken line part in Fig.3 (a) conceptually shows the range enclosed by the 1st junction part. 4A is a cross-sectional view of the top sheet taken along line XX ′ of FIG. 3A, and FIG. 4B is taken along line X2-X2 ′ of FIG. It is sectional drawing which extracted the top sheet. As shown in FIG. 4, the top sheet 2 includes a first top sheet 2a provided on the skin contact surface side and a second top sheet 2b provided on the non-skin contact surface side with respect to the first top sheet 2a. The first top sheet 2a is partially joined to the second top sheet 2b by a plurality of joints.

  When the range surrounded by the dotted line of the top sheet 2 shown in FIG. 2 is viewed in plan, as shown in FIG. 3, the first top sheet 2a is convex on the skin contact surface side in a sectional view, The first top portion 6A formed in a substantially hexagonal shape and the second joint portion 6B formed in a substantially pentagonal shape are partially joined to the second top sheet. As shown in FIG. 3B, each side of the first joint 6A and one side of the adjacent second joint 6B are shared, and some of the sides of the second joint 6B are shared. Each joint is arranged so that the first joint 6A is surrounded by the second joint 6B. The second joint 6B is adjacent to another second joint 6B while sharing a part of the side. Thus, each joint portion shares at least a part of the side with other joint portions adjacent to each other, and has dot-shaped joint points 6a and 6c and a substantially Y-shaped joint point 6b. Further, from the viewpoint of cosmetics, it is preferable that the center distance between the first joint portions 6A arranged on the same line is 10 mm or more.

  As shown in FIG. 3B, there are dot-like joint points 6a in the vicinity of the midpoint of each side of the first joint portion 6A. The shape of the dot-like junction point 6a is a circular shape, but may be a rectangular shape, a polygonal shape, or the like. Moreover, it is preferable that the area of each dot-shaped joining point 6a is the same from a viewpoint of joining property maintenance and cosmetics.

  Further, as shown in FIG. 3B, when the four sides of the second junction 6B intersect at the first point P1, the second junction 6B is the first point when the dot-like junction 6c intersects at the first point P1. It is formed along each side starting from P1. The shape of the dot-like joint point 6c exemplifies a circular shape. However, like the shape of the dot-like joint point 6a formed in the vicinity of the midpoint of each side of the first joint portion 6A, the shape is rectangular or polygonal. Although a shape etc. may be sufficient, a circular shape is preferable from a viewpoint of workability. It is preferable that the dot-shaped joint point 6a and the dot-shaped joint point 6c have the same shape from the viewpoint of cosmetics. Moreover, it is preferable that the area of each of the dot-shaped joint points 6a is substantially the same from the viewpoint of maintaining the bondability and the cosmetics. Furthermore, it is preferable that the areas of the dot-shaped joint points 6 a and the dot-shaped joint points 6 c are substantially the same from the viewpoint of imparting a uniform holding force to the top sheet 2.

  Further, as shown in FIG. 3B, when the three sides of the joint intersect at the second point P2, the joint 6A, 6B is a second point when the substantially Y-shaped joint 6b intersects at the second point P2. It is formed along each side starting from P2. Moreover, it is preferable that the area of each substantially Y-shaped joining point 6b is the same from the viewpoint of maintaining the joining property and the cosmetics. Here, the substantially Y-shaped shape should just protrude in the diagonal direction, and the grade, length, and thickness of the inclination can be appropriately set as necessary.

  The total area of the junction point of the first junction 6A and the junction point of the second junction 6B, that is, the combined area of the dot-like junction points 6a and 6c and the substantially Y-shaped junction point 6b is the texture and the junction. From the viewpoint of retention, it is preferably 2% or more and 5% or less with respect to the area of the second top sheet 2b. The area of the joints 6A and 6B can be measured, for example, by photographing the top sheet 2 from above and performing image processing using Win ROOF (manufactured by Mitani Corporation) as image analysis software.

  The dot-like joint points 6a and 6c and the substantially Y-shaped joint point 6b are combined to form a first joint portion 6A formed in a substantially hexagonal shape and a second joint portion 6B formed in a substantially pentagonal shape. By forming the first top sheet 2a, the first top sheet 2a and the second top sheet 2b can be firmly bonded. Therefore, compared to a structure having no such structure, the area for forming the bonding portion can be reduced. The sheet hardness of the sheet 2 is reduced, the formation of wrinkles is suppressed, and the top sheet 2 is excellent in surface dryness.

As shown to Fig.4 (a), the part enclosed by 6 A of 1st junction parts formed in the 1st top sheet 2a is convex on the skin contact surface side. The inside of the convex region 51 by the first joint portion 6A is composed of the first top sheet 2a on the skin contact surface side and the second top sheet 2b on the non-skin contact surface side, and has an absorption holding force. From the viewpoint, a hollow structure is preferable. The shape of the convex region 51 is not particularly limited, and examples thereof include a cone shape, a cone shape, a rectangular parallelepiped shape, a quadrangular pyramid shape, a hemispherical shape, a triangular pyramid shape, a truncated cone shape, and a truncated pyramid shape. It is done. Bottom area 51a of the first joint portion 6A is excellent in beautification, it is preferable Ku each having 20 mm ² or more 100 mm ² or less of the bottom area 51a, more preferably 50 mm ² or more 100 mm ² or less. In addition, the convex region 51 has a hemispherical shape, a truncated cone shape, or a truncated berth having a bottom area larger than the upper area because the convex region 51 is not easily crushed when worn and has a good feel. A pyramid shape is preferred. The height 51h of the convex region 51 by the first joint 6A is preferably 1 mm or more and 5 mm or less. If the height 51h of the convex region 51 is lower than 1 mm, the cosmetic properties decrease, and if it exceeds 5 mm, the wearability decreases.

Moreover, the part enclosed by the 2nd junction part 6B formed in the 1st top sheet 2a is convex on the skin contact surface side like the convex area | region 51 by 6 A of 1st junction parts. The inside of the convex region 52 by the second joint 6B includes a first top sheet 2a on the skin contact surface side and a second top sheet 2b on the non-skin contact surface side as shown in FIG. From the viewpoint of absorption holding power, a hollow structure is preferable. The shape of the convex region 52 is not particularly limited, and examples thereof include a cone shape, a cone shape, a rectangular parallelepiped shape, a quadrangular pyramid shape, a hemispherical shape, a triangular pyramid shape, a truncated cone shape, and a truncated pyramid shape. It is done. Bottom area 52a of the second joint portion 6B is excellent in beautification, it is preferable Ku each having 20 mm ² or more 100 mm ² or less of the bottom area 52a, more preferably 50 mm ² or more 100 mm ² or less. In addition, the convex region 52 has a hemispherical shape, a truncated cone shape, or a wharf shape having a bottom area larger than the upper area because the convex region 52 is not easily crushed when worn and has a good touch. A pyramid shape is preferred. As for the height 52h of the convex area | region 52 by the 2nd junction part 6B, 1 mm or more and 5 mm or less are preferable. If the height 52h of the convex region 52 is lower than 1 mm, the cosmetic properties decrease, and if it exceeds 5 mm, the wearability decreases. Since the skin contact area is reduced and the feeling of wear is improved, and body fluid is easily guided to the absorbent body, the height 51h of the convex region 51 by the first joint portion 6A and the convex shape by the second joint portion 6B. It is preferable that the height 52h of the region 52 is different, and considering the cosmetics, the height 51h of the convex region 51 by the first joint 6A is lower than the height 52h of the convex region 52 by the second joint 6B. It is more preferable.

  The bottom areas 51a and 52a of the convex regions are simply defined as areas surrounded by the junctions of the first junction 6A and the second junction 6B, respectively. For example, the top sheet 2 is photographed from the top, It can be measured by performing image processing using the above-described image analysis software Win ROOF (manufactured by Mitani Corporation). Similarly, the heights 51h and 52h of the convex regions are cut out using only a top sheet 2 or a razor or the like so as not to deform the absorbent article 1, and the cross section is image analysis software in the same manner as the measurement of the bottom area. It can be measured by performing image processing using Win ROOF (Mitani Corporation).

The base material of the top sheet 2 only needs to have a liquid permeability such that a liquid such as blood or body fluid moves to the absorber 4, for example, a nonwoven fabric such as a thermal bond nonwoven fabric represented by an air-through nonwoven fabric, It is formed from a material such as a composite nonwoven fabric in which thermal bonds / spun bonds are laminated, an opening film such as an opening polyethylene film, a foam film such as polyethylene foam and urethane foam, or a composite sheet in which these are laminated. From the viewpoint of strength and workability, the first top sheet 2a and / or the second top sheet 2b have a basis weight of 20 g / m ^{2 to} 40 g / m ² and a fineness of 1.3 dtex to 5.0 dtex. It is preferably a short fiber thermal bond nonwoven fabric, more preferably a basis weight of 20 g / m ² or more and 30 g / m ² or less and a short fiber thermal bond nonwoven fabric of 2.0 dtex or more and 4.0 dtex or less. The first top sheet 2a and the second top sheet 2b may be the same base material or different base materials, and from the viewpoint of cosmetics, a base material colored on the second top sheet 2b may be used. In order to reduce irritation to the skin, the top sheet 2 preferably contains a lotion, an antioxidant, an anti-inflammatory component, a pH adjuster, an antibacterial agent, a moisturizing agent and the like.

(Absorber)
The absorber 4 contains fluff pulp and superabsorbent resin (SAP), and is arranged from the front part to the rear part via the crotch part. The base material of the absorbent body 4 is not particularly limited as long as it is generally used for absorbent articles such as sanitary napkins, diapers, and urine pads. For example, fluff pulp, cotton, rayon, acetate, tissue, absorbent paper It is formed from a material such as a hydrophilic nonwoven fabric. Among these, fluff pulp is preferable from the viewpoint of absorbability. Examples of such fluff pulp include wood pulp and synthetic fibers, polymer fibers, etc. and non-wood pulp defibrated in a cotton-like form, and the base material of the absorbent body 4 so as not to impair the absorption performance and touch. The basis weight is preferably 100 g / m ² or more and 800 g / m ² or less.

The superabsorbent resin (SAP) of the absorbent body 4 is not particularly limited as long as it absorbs body fluids and can prevent backflow. For example, sodium polyacrylate, polyaspartic acid, (starch-acrylic) It is formed from materials such as (acid) graft copolymers, (acrylic acid-vinyl alcohol) copolymers, (isobutylene-maleic anhydride) copolymers and saponified products thereof. Among these, sodium polyacrylate is preferable from the viewpoint of the amount of absorption per weight. Moreover, so as not to impair the absorption performance and feel, SAP of the absorbent body 4 is preferably set to 50 g / ^{m 2} or more 500 g / ^{m 2} or less of the basis weight.

  The base material and SAP of the absorbent body 4 are preferably formed by mixing high SAP particles in the base material or an SAP sheet in which high-absorbent polymer particles are fixed between the base materials. Moreover, in order to prevent leakage of SAP particles and stabilize the shape of the absorber 4, it is preferable to wrap the absorber 4 in a carrier sheet. As a base material of a carrier sheet, what is necessary is just to have hydrophilicity, and hydrophilic nonwoven fabrics, such as tissue, an absorbent paper, an airlaid nonwoven fabric, can be mention | raise | lifted. In the case where a plurality of carrier sheets are provided, the base material of the carrier sheet may be the same or different.

  The shape of the absorbent body 4 is not particularly limited as long as it is generally used for absorbent articles such as sanitary napkins, diapers, and urine pads, and examples thereof include a rectangular shape, an hourglass shape, and an I-shape. Can do. Moreover, it is preferable to emboss the surface of the absorbent body 4 because the diffusion of the body fluid is controlled and the absorbent body 4 is easily deformed according to the body shape of the user. Further, two or more absorbers may be stacked.

In order to promote the diffusion of liquid such as urine to the upper surface of the absorber 4, a liquid diffusable sheet 8 can be provided between the second top sheet 2 b and the absorber 4. It is preferable that the liquid diffusable sheet 8 is a hydrophilic nonwoven fabric. Moreover, a hydrophilic nonwoven fabric can be used for the material of the liquid diffusable sheet 8, and an air-through nonwoven fabric is particularly preferable. Examples of the liquid diffusive sheet 8 include a point bond nonwoven fabric, a spun bond nonwoven fabric, a melt blown nonwoven fabric, or a composite nonwoven fabric in which spun bond / melt blow, spun bond / melt blown / spun bond are laminated. The thickness of the liquid diffusable sheet 8 is preferably 0.1 mm or more, and the basis weight thereof is preferably 15 g / m ² or more, particularly 18 g / m ² or more. If the thickness is less than 0.1 mm or the basis weight is less than 15 g / m ^2, it is not preferable because the liquid is not sufficiently diffused over the entire upper surface of the absorbent body 4. The shape of the liquid diffusive sheet 8 is not particularly limited, but is preferably a shape that can completely cover the surface of the absorbent body 4 so that body fluid diffuses throughout the absorbent body 4.

(Back sheet)
The base material of the back sheet 3 only needs to have liquid impermeability so that the body fluid retained by the absorbent body 4 does not leak into the underwear, such as a nonwoven fabric, a resin film, or a composite sheet obtained by laminating these. Formed from material. Such a nonwoven fabric is not particularly limited in its production method, and examples thereof include spunbond and meltblown nonwoven fabrics, or composite nonwoven fabrics in which spunbond / meltblown, spunbond / meltblown / spunbond are laminated, and composite materials thereof. Examples of the resin film include polyester, polyvinyl alcohol, polyethylene, polypropylene, and a composite film of polyethylene and polypropylene. It is preferable that the back sheet 3 is provided with an adhesive for adhering to underwear and the like, and a release paper is provided on the outside thereof.

From the viewpoint of strength and workability, the basis weight of the back sheet 3 is preferably about 15 g / m ² or more and 40 g / m ² or less, more preferably 18 g / m ² or more. Further, it is preferable that the back sheet 3 has air permeability in order to prevent stuffiness at the time of wearing. In order to provide moisture permeability, for example, a filler is blended in the resin film of the base material, and embossing is applied to the back sheet 3. An example of the filler is calcium carbonate, and the processing method thereof can be a known method without limitation.

  In the absorbent article 1, the absorbent body 4 is sandwiched between the top sheet 2 and the back sheet 3, and the liquid diffusable sheet 8 and the three-dimensional gather 7 are appropriately disposed, and then the top sheet 2 and the back sheet 3 are combined. It can manufacture by fixing using a hot-melt-adhesive over a part or the perimeter. Examples of adhesives include synthetic rubbers such as styrene / butadiene / styrene copolymers and styrene / isoprene / styrene copolymers having a melting point of about 100 ° C. to 180 ° C .; or ethylene-vinyl acetate copolymers, etc. These olefin-based hot melt adhesives can be used. The hot melt adhesive application method includes a curtain coat method in which a molten adhesive is applied in a non-contact manner from a nozzle, a spiral method, a slot method in which a contact method is applied, and any known method can be used. .

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. Further, it is apparent from the scope of the claims that embodiments with such changes or improvements can also be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Absorbent article 2 Top sheet 2a 1st top sheet 2b 2nd top sheet 3 Back sheet 4 Absorber 51 Convex area | region 52 by 1st junction part Convex area | region 51a by 2nd junction part Bottom area 52a of 1st junction part Bottom area 51h of second joint part Height 52h of convex area by first joint part 6A Height of convex area by second joint part 1A First joint part 6B Second joint part 6a, 6c Dot-shaped joint point 6b Joint point 7 having a substantially Y shape Three-dimensional gather 7a Three-dimensional gather sheet 7b Three-dimensional gather elastic member 8 Liquid diffusive sheet P1 First point P2 Second point

Claims (4)

An absorbent article,
A liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet,
The top sheet includes a first top sheet and a second top sheet provided on the non-skin contact surface side than the first top sheet,
The first top sheet is convex on the skin contact surface side in a cross-sectional view, and is formed in a substantially hexagonal shape in a plan view, and a second joint portion formed in a substantially pentagonal shape. Are partially joined to the second top sheet, and the region surrounded by each joint is convex on the skin contact surface side,
The convex shape is a hollow structure,
Each joint shares at least some sides with other joints adjacent to each other,
When four sides intersect at a first point, each joint has a dot-like joint point along each side starting from the first point;
When three sides intersect at the second point, each joint has a substantially Y-shaped joint point along each side, starting from the second point;
The absorbent article having the dot-shaped joint point in the vicinity of the midpoint of each side of the first joint portion. 2. The absorbent article according to claim 1, wherein the convex region surrounded by the first joint and the second joint has a bottom area of 20 mm ² or more and 100 mm ² or less.   The absorption point according to claim 1 or 2, wherein a joint point of the first joint portion and the second joint portion has a total area of 2% or more and 5% or less with respect to the second top sheet. Sex goods. The first top sheet and / or the second top sheet is a short fiber thermal bond nonwoven fabric having a basis weight of 20 g / m ² or more and 30 g / m ² or less and a fineness of 1.3 dtex or more and 5.0 dtex or less. The absorptive article according to any one of claims 1 to 3 characterized by things.

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