JP2021016542A - Absorbent article - Google Patents

Abstract

To provide an absorber which does not contain fluff pulp and is excellent in absorbency and wear feelings, and an absorbent article provided with the absorber.SOLUTION: An absorber 1 has a shape which bends a raised face outside into a C shape. A distance A between both ends of the absorber 1 accounts for 10 to 50% of a lateral width B of the absorber 1. The absorber 1 has: a high absorbent sheet 10 composed of a substrate non-woven fabric 11 whose surface is raised and a high absorbency polymer 12 fixed and carried between fibers of the raised part of the substrate non-woven fabric 11; and a hydrophilic sheet 20 wrapping the raised face of the high absorbent sheet 10. In the absorbent article using the absorber 1, the high absorbent sheet 10 has thickness measured under load 35 g/cm2 which is between 0.5 mm and 3.0 mm and thickness measured under the load 35 g/cm2 which is between 30% to 70% of the thickness measured under a no-load state.SELECTED DRAWING: Figure 3

Description

The present invention relates to absorbent articles.

In general, an absorbent article is composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body arranged between the top sheet and the back sheet, whereby urine and the like are formed. The body fluid is absorbed by the absorber through the top sheet. There are various types of these absorbent articles, whether for adults or infants, depending on the application, such as tape-type disposable diapers, pants-type disposable diapers, urine absorbing pads, and light incontinence pads. ..

For the absorbents constituting these absorbent articles, it was common to use fluff pulp and a super absorbent polymer (also referred to as SAP) in combination, but the wearing feeling, appearance and touch when worn. A so-called superabsorbent sheet (also referred to as SAP sheet), which is composed of a non-woven fabric as a base and a superabsorbent polymer, may be used as an absorber for the purpose of improving the above and reducing the reversion of urine. Various studies have been made on.

As highly absorbent sheets that have been studied so far, for example, in Patent Document 1, a first sheet and a second sheet coated with an adhesive and a highly absorbent sheet arranged between the first sheet and the second sheet With the sex polymer, the application of the adhesive at least at the sites corresponding to the multiple regions on the second sheet is intermittent and opposes the first sheet on both sides of the highly absorbent polymer in the width direction. A highly absorbent sheet is disclosed characterized in that the adhesive is continuously applied to the site in the longitudinal direction and the highly absorbent polymer is arranged in stripes along the longitudinal direction.

Further, Patent Document 2 discloses an absorber in which a highly absorbent sheet is arranged in a folded state in a region where the highly absorbent polymer does not exist.

Further, Patent Document 3 discloses an absorber in which two highly absorbent sheets are bent along a longitudinal direction and two highly absorbent sheets are arranged so that the folds face each other.

Japanese Unexamined Patent Publication No. 2006-158676 Japanese Unexamined Patent Publication No. 2010-88529 Japanese Unexamined Patent Publication No. 2013-42882

However, in Patent Document 1 and many other highly absorbent sheets, since the substrate non-woven fabric and the highly absorbent polymer are fixed by using a hot melt adhesive, the feeling of wearing is deteriorated due to the hardness of the skin, and the fit is also reduced. There was a problem that a feeling of strangeness was caused because the sex could not be obtained. Further, as compared with the conventional absorber composed of fluff pulp and a highly absorbent polymer, most of the highly absorbent sheets have high absorbency because the highly absorbent polymer is fixed to the base non-woven fabric by an adhesive means. Due to the high density of the polymer, the absorption time is long and the diffusivity of urine is poor, so that the absorption is not sufficiently satisfactory.

Further, although the highly absorbent sheet described in Patent Document 2 has a structure as described above to prevent leakage of the highly absorbent polymer, it is similar to the highly absorbent sheet described in Patent Document 1. I was not fully satisfied with the texture, fit, and absorbency.

Further, in the highly absorbent sheet described in Patent Document 3, although the fit to the crotch is improved by having the above-mentioned structure, the point that the high-absorbent sheet is hard to the touch is improved. It was not, and I was not fully satisfied with the feeling of wearing it. Further, as with the highly absorbent sheets described in Patent Documents 1 and 2, the absorbency was not sufficiently satisfactory.

As described above, the absorbers described in Patent Documents 1, 2 and 3 and the absorbent articles using the absorbers did not sufficiently satisfy both the absorbency and the wearing feeling. Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide an absorbent body that does not contain flap pulp and has good absorbency and wearing feeling, and an absorbent article having the absorbent body. And.

The inventor of the present invention has conducted diligent research in view of the above problems. As a result, they have found that the above problems can be solved by devising the mode of the non-woven fabric as the substrate and the method of supporting the highly absorbent polymer, and further appropriately folding and arranging the highly absorbent sheet, and complete the present invention. It came to. Specifically, the present invention provides the following.

(1) A first aspect of the present invention includes a liquid-permeable top sheet 25, a liquid-impermeable back sheet 30 arranged to face the top sheet 25, and a top sheet 25 and a back sheet 30. An absorbent article comprising an absorber 1 arranged between the two.
The absorber 1 has a C-folded shape (inner tri-fold: folded back toward the center at both ends) with the raised surface facing outward.
The grooved surface at the center of the C-fold faces the top sheet.
The distance A between both ends of the absorber 1 is 10 to 80% of the width B of the absorber 1.
The absorbent body 1 is a highly absorbent sheet 10 composed of a base nonwoven fabric 11 having a raised surface, a highly absorbent polymer 12 fixedly supported between fibers of the raised portion of the substrate nonwoven fabric 11, and the highly absorbent sheet. It has a hydrophilic sheet 20 that wraps the raised surface side of 10 and
When the absorber 1 is measured in a flat state before being C-folded, it is measured.
The thickness measured under a load of 35 g / cm ² is 0.5 mm or more and 3.0 mm or less, and the thickness measured under a load of 35 g / cm ² is 30% of the thickness measured under no load. It is an absorbent article having a value of 70% or more and 70% or less.

(2) The second aspect of the present invention is the absorbent article according to (1), wherein the SAP abundance ratio of the C-folded portion 13 of the absorber 1 is smaller than that of the non-folded portion. Is to be.

(3) A third aspect of the present invention is the absorbent article according to (1) or (2), wherein the base nonwoven fabric 11 is an air-through nonwoven fabric, and the basis weight of the substrate nonwoven fabric 11 is 20 g. / ^{m 2} or more 120 g / ^{m 2} or less, the thickness is at 0.3mm or 3.5mm or less, and wherein the thickness of the fibers constituting the base nonwoven 11 is greater than or equal to 1.6dtex 14dtex less It is something to do.

(4) A fourth aspect of the present invention is the absorbent article according to (1) to (3), wherein the high absorbent polymer 12 has a basis weight of 150 g / m ² or more and 1000 g / m ² or less. It is characterized by being.

(5) A fifth aspect of the present invention is the absorbent article according to (1) to (4), wherein the hydrophilic sheet 20 has a basis weight of 7 g / m ² or more and 45 g / m ² or less. It is characterized by being a hydrophilic non-woven fabric or tissue paper.

(6) A sixth aspect of the present invention is the absorbent article according to (1) to (5), wherein the highly absorbent polymer 12 is raised by a hot melt adhesive to raise the substrate nonwoven fabric 11. It is characterized in that it is fixedly supported between the fibers of the formed portion and the content of the hot melt adhesive is 10 g / m ² or less.

The present invention is effective in providing an absorbent 1 that does not contain flap pulp and has good absorbency and wearing comfort, and an absorbent article that includes the absorbent 1.

Further, by arranging the highly absorbent sheet 10 in a shape in which the raised surface is C-folded outward, the substrate nonwoven fabric 11 is exposed at the central portion of the absorber 1 (part A in the figure). Since this portion acts like an absorber 1 slit, the absorption rate is high and the diffusivity of urine is improved. In addition, since the highly absorbent polymer is absent at this site, it is not affected by the expansion of the highly absorbent polymer even after urinating once, maintains good diffusivity even during repeated water absorption, and has good absorption performance. is there.
Therefore, according to the present invention, it is possible to obtain an absorbent body 1 having good absorbency and a feeling of wearing, and an absorbent article having the absorbent body 1.

It is a perspective view of the substrate nonwoven fabric 11 used for the absorber 1 of this invention. It is a cross-sectional view in the width direction of the high absorption sheet 10 used for the absorber 1 of this invention. It is sectional drawing in the width direction of the absorber 1 of this invention. It is a cross-sectional view in the width direction of the absorber 1 of this invention of another aspect. It is a top view of the absorbent article of this invention.

(Base non-woven fabric)
As shown in FIG. 1, one side surface of the substrate nonwoven fabric 11 is in a raised state. Therefore, in addition to the original bulkiness of the non-woven fabric, by imparting an appropriate thickness and softness to the highly absorbent sheet 10, an appropriate cushioning property can be generated and a fit feeling at the time of wearing can be improved. Further, by raising the base nonwoven fabric 11 as described above, the highly absorbent polymer 12 can be dispersed and fixedly supported between the fibers of the raised portion of the substrate nonwoven fabric 11. Examples of the method for raising the body side surface of the substrate nonwoven fabric 11 include a rotary saw blade and a needle punch, and it is preferable to use a method of raising fluff with the rotary saw blade from the viewpoint of in-line productivity and cost.

Examples of the substrate non-woven fabric 11 include non-woven fabrics such as air-through non-woven fabric, point-bonded non-woven fabric, spunbond non-woven fabric, and melt-blow non-woven fabric, and composite non-woven fabric in which spunbond non-woven fabric / melt-blow non-woven fabric, spunbond non-woven fabric / melt-blow non-woven fabric / spunbond non-woven fabric are laminated. be able to. Of these non-woven fabrics, it is preferable to use an air-through non-woven fabric that is easily bulky.

The thickness of the base non-woven fabric 11 is preferably 0.3 mm or more and 3.5 mm or less from the viewpoint of the balance between wearing feeling and absorption performance. If it is less than 0.3 mm, the high-absorption polymer cannot be sufficiently retained, and the polymer will be broken when raised. If it exceeds 3.5 mm, the wearing comfort is inferior and a strong sense of discomfort is felt. The basis weight of the substrate nonwoven fabric 11 is preferably 20 g / m ² or more and 120 g / m ² or less. When it is less than 20 g / m ² , it cannot be brushed properly. If it exceeds 120 g / m ² , the wearing comfort is inferior and a strong sense of discomfort is felt.

Further, the thickness of the fibers constituting the substrate nonwoven fabric 11 is preferably 1.6 dtex or more and 14 dtex or less, more preferably 1.8 dtex or more and 9.0 dtex or less, and 2.0 dtex or more and 6.0 dtex or less. It is more preferable to have. When it is less than 1.6 dtex, it cannot be brushed properly. If it exceeds 14 dtex, it is difficult to raise the hair, the highly absorbent polymer easily enters the gaps between the fibers, and the absorbent sheet is difficult to exhibit the absorption performance. By adjusting the thickness of the fibers constituting the base nonwoven fabric 11 in the above range in this way, the highly absorbent polymer 12 can be dispersed between the fibers of the raised portion of the substrate nonwoven fabric 11 to facilitate sticking and supporting. it can.

(Highly absorbent sheet)
As shown in FIG. 2, the highly absorbent sheet 10 used for the absorber 1 of the present invention has high absorbency that is fixedly supported between the base nonwoven fabric 11 having a raised surface on one side and the fibers of the raised portion of the substrate nonwoven fabric 11. It has a polymer 12 and. The highly absorbent polymer 12 is dispersed and fixedly supported between the fibers of the raised portion of the base nonwoven fabric 11, so that urine is appropriately diffused or held in the substrate nonwoven fabric 11 around the highly absorbent polymer 12 to be absorbed. The performance is improved, and sufficient absorption performance can be ensured without having fluff pulp.

The highly absorbent sheet 10 of the absorber 1 has a thickness of 0.5 mm or more and 3.0 mm or less measured under a load of 35 g / cm ² when measured in a flat state before being folded into C, preferably 0. It is 0.8 mm or more and 2.0 mm or less. If the thickness is less than 1.0 mm, the slit-like effect as described in paragraph [0020] is not exhibited even if the C-fold is made. If the thickness exceeds 4.0 mm, the wearing comfort will be inferior and you will feel a sense of discomfort.

The thickness measured under the above load is 30% or more and 70% or less, preferably 35% or more and 67% of the thickness measured under no load. If this thickness ratio is less than 30%, the change in thickness when pressure is applied is too large, and a sense of discomfort is felt. For example, I feel it when I change my posture from standing to sitting. If it exceeds 70%, it lacks flexibility, resulting in a lack of fit and a large amount of leakage to the outside of the disposable diaper.

(Highly absorbent polymer)
The highly absorbent polymer 12 is not particularly limited as long as it can absorb urine and prevent backflow, and is a sodium polyacrylate-based, polyasparaginate-based, or (starch-acrylic acid) graft copolymer. , (Acrylic acid-vinyl alcohol) copolymer, (isobutylene-maleic anhydride) copolymer and those formed from materials such as saponified products thereof can be used. Among these, sodium polyacrylate is preferable from the viewpoint of the amount of absorption per weight. Further, the basis weight of the highly absorbent polymer 12 is preferably 200 g / m ² or more and 1200 g / m ² or less in order to secure the absorption performance required for various absorbent articles. If it is less than 200 g / m ² , the amount of the highly absorbent polymer is too small and the absorbency is insufficient, and it is easy to leak. If it exceeds 1200 g / m ² , the presence of the highly absorbent polymer is too strong and the feeling of discomfort is great. Further, from the viewpoint of further improving the absorption performance, the feel after absorption, and the ease of movement of the wearer, the basis weight of the highly absorbent polymer 12 is more preferably 300 g / m ² or more and 900 g / m ² or less.

Further, from the viewpoint of improving the basic performance regarding absorption by avoiding fine powder having poor fluidity as a powder and reducing the rugged tactile sensation generated by the hardening of the highly absorbent sheet 10, high absorption is achieved. The medium particle size of the sex polymer 12 is preferably 50 μm or more and 600 μm or less, and more preferably 100 μm or more and 500 μm or less.

The highly absorbent polymer 12 is preferably fixedly supported between the fibers of the raised portion of the base nonwoven fabric 11 by a hot melt adhesive, and when the basis weight of the substrate nonwoven fabric 11 is relatively low, the highly absorbent polymer 12 is used. The hot melt adhesive works particularly well to reinforce the fixation bearing of 12. The content of the hot melt adhesive is preferably 10 g / m ² or less so as not to impair the absorbency of the highly absorbent polymer 12 and not to impair the feel when worn. As the hot melt adhesive, a synthetic rubber-based copolymer such as a styrene-butadiene-styrene-based copolymer or a styrene-isoprene-styrene-based copolymer having a melting point of 100 ° C. or higher and 180 ° C. or lower, or an ethylene-vinyl acetate copolymer. Styrene-based hot melt adhesives such as the above can be used. As a method for applying the hot melt adhesive, known methods such as a curtain coating method in which a hot melt adhesive in a molten state is applied from a nozzle in a non-contact manner, a spiral method, and a slot method in which a hot melt adhesive is applied by a contact method can be used.

<Absorbent>
The absorber 1 according to the embodiment of the present invention is used without particular limitation, such as a tape type disposable diaper, a pants type disposable diaper, a urine absorbing pad, and a light incontinence pad, regardless of whether it is for adults or infants. It can be used for various absorbent articles depending on the above. In the description of the present specification, the longitudinal direction of the absorber 1 is a direction extending in front of and behind the wearer when worn, and is a direction indicated by reference numeral Y in the drawing. Further, the width direction of the absorber 1 is a direction laterally or orthogonal to the longitudinal direction, and is a direction indicated by X in the drawing. Further, in the present specification, the body-side surface of the absorber 1 refers to a surface that comes into contact with the wearer's skin when worn, and the clothing-side surface refers to a surface that comes into contact with the wearer's clothing when worn. Further, the thickness direction of the absorber 1 is indicated by Z in the figure.

As shown in FIG. 3, the absorbent body 1 of the present invention has a highly absorbent sheet 10 and a hydrophilic sheet 20 that adheres to the raised surface of the highly absorbent sheet 10. The water-absorbing body 1 is arranged in a C-folded shape in which the highly absorbent sheet 10 is folded with the raised surface on the outside and both ends in the lateral direction toward the center. Since the absorber 1 of the present invention does not contain fluff pulp, it is possible to obtain an absorber that suppresses the reversion of urine and easily maintains a silky feel.

(Hydrophilic sheet)
As shown in FIG. 3, the absorber 1 of the present invention has a hydrophilic sheet 20 that adheres to the raised surface of the highly absorbent sheet 10. By adhering the raised surface of the highly absorbent sheet 10 to the hydrophilic sheet 20, it is possible to prevent the highly absorbent polymer 12 from leaking to the outside of the absorbent body 1, and it is possible to improve the feel when worn. .. Examples of the hydrophilic sheet 20 include hydrophilic non-woven fabrics such as tissue paper, absorbent paper, spunbonded non-woven fabric and air-laid non-woven fabric, and it is preferable to use hydrophilic non-woven fabric or tissue paper from the viewpoint of availability and cost. The basis weight of the hydrophilic sheet 20 is preferably 7 g / m ² or more and 45 g / m ² or less, and more preferably 8 g / m ² or more and 15 / m ² or less. If it is less than 7 g / m ² , the highly absorbent polymer cannot be retained and will pass through. If it exceeds 45 g / m ² , the capacity of the hydrophilic sheet is too much affected, and the capacity of the absorbent sheet cannot be fully exhibited. When the raised surface of the highly absorbent sheet 10 is adhered to the hydrophilic sheet 20, it is preferable to fix the highly absorbent sheet 10 and the hydrophilic sheet 20 by hot melt adhesive or heat embossing.

<Absorbable article>
Another embodiment of the present invention is an absorbent article comprising the absorber 1 of the present invention. Examples of the absorbent article include tape-type disposable diapers, pants-type disposable diapers, urine absorbing pads, light incontinence pads, and various types depending on the application, regardless of whether they are for adults or infants. The absorbent article is between the liquid-permeable top sheet 25 arranged on the body side, the liquid-impermeable back sheet 30 arranged facing the top sheet 25, and the top sheet 25 and the back sheet 30. The absorber 1 arranged in the above is provided. As a result, the absorber 1 has a structure sandwiched between the top sheet 25 and the back sheet 30, and body fluid such as urine is absorbed by the absorber 1 through the top sheet 25. In addition, three-dimensional gathers, leg gathers, waist gathers, side flaps and the like can be appropriately provided depending on the use and type of the absorbent article. An example of the absorbent article of the present invention is shown in FIG. 4, but is not limited thereto.

(Top sheet)
The top sheet 25 allows the body fluid to quickly pass toward the absorber 1 and is arranged so as to face the back sheet 30 with the absorber 1 interposed therebetween. Since the top sheet 25 is a sheet that comes into contact with the skin, the top sheet 25 has a property of having a soft feel and not irritating the skin, and is made of synthetic fibers such as polypropylene and polyethylene, and recycled rayon and the like. A hydrophilic non-woven fabric obtained by a known processing method such as an air-through method, a thermal bond method, a spunlace method, or a spunbond method using natural fibers such as fibers and cotton, or a composite non-woven fabric obtained by laminating these, an open polyethylene film. An open film such as, a foamed film such as urethane foam, or the like can be used. Further, the surface of the top sheet 25 may be embossed or perforated in order to improve the liquid permeability. As a method for performing these embossing and drilling processes, known methods can be carried out without limitation. Further, in order to reduce irritation to the skin, the top sheet 25 may contain a lotion, an antioxidant, an anti-inflammatory component, a pH adjuster, an antibacterial agent, a moisturizer and the like.

From the viewpoint of strength, workability and liquid return amount, the basis weight of the top sheet 25 is preferably 15 g / m ² or more and 200 g / m ² or less. The shape of the top sheet 25 is not particularly limited, but may be any shape that covers the absorber 1 that is required to guide the body fluid to the absorber 1 so as not to leak.

(Back sheet)
The back sheet 30 may be formed by using a base material having a liquid impermeable property so that the body fluid held by the absorber 1 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 spunbonded non-woven fabric, a melt-blown non-woven fabric, a spunbonded non-woven fabric / melt-blow non-woven fabric, a composite non-woven fabric in which spunbond non-woven fabric / melt-blow non-woven fabric / spunbond non-woven fabric is laminated, and these Examples include composite materials. 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 30 is preferably 15 g / m ² or more and 40 g / m ² or less. Further, in order to prevent stuffiness at the time of mounting, it is preferable that the back sheet 30 has air permeability. In order to provide the back sheet 30 with breathability, for example, a filler may be blended in the resin film of the base material, or the back sheet 30 may be embossed for perforation. Calcium carbonate can be mentioned as the filler, and a known method can be used without limitation as the blending method.

<Manufacturing method of absorber>
The method for producing the absorber 1 is not particularly limited, and examples thereof include the following methods. The surface of one side of the substrate nonwoven fabric 11 is raised using a rotary saw blade or a needle punch.
Then, the highly absorbent polymer 12 is fixedly supported between the fibers of the raised portion of the substrate nonwoven fabric 11 with a hot melt adhesive or the like. Then, the raised surface side of the substrate nonwoven fabric 11 and the hydrophilic sheet 20 are adhered with a hot melt adhesive or the like to obtain a highly absorbent sheet 10. The highly absorbent sheet 10 is C-folded (inner tri-fold) with the raised surface facing outward and both ends in the lateral direction toward the center to obtain an absorber. The C-fold crease draws a smooth arc, which may draw a square U-shape. A groove is formed in the central portion of the absorber by a distance A, and this portion acts like an absorber slit. The grooved surface is arranged toward the top sheet.

<Manufacturing method of absorbent articles>
As a method for producing an absorbent article, the absorber 1 obtained as described above is sandwiched between the top sheet 25 and the back sheet 30, but the C-folded surface of the absorber 1 is formed with a groove. Manufactured by arranging toward the top sheet and fixing the top sheet 25 and the back sheet 30 with hot melt adhesive, heat embossing, ultrasonic embossing, high frequency embossing, etc. over a part or the entire circumference. Can be done. Then, this may be individually wrapped in a package, and then folded in three in the longitudinal direction. Further, three-dimensional gathers, leg gathers, waist gathers, side flaps and the like can be provided as needed.

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 of the invention described in the above embodiments. It will be apparent to those skilled in the art that improvements can be made. Further, it is clear from the description of the claims that the form in 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.

<Preparation of absorber>
First, an air-through non-woven fabric of the base non-woven fabric 11 (basis weight 40 g / m ² , width direction dimension 100 mm) is prepared, and one side surface of the base non-woven fabric 11 is physically brushed with a saw blade to increase the height of sodium polyacrylate. The absorbent polymer 12 (basis weight 380 g / m ² ) is dispersed, and the highly absorbent polymer 12 is fixedly supported between the fibers of the raised portion of the substrate nonwoven fabric 11 with a hot melt adhesive. Further, a spunbonded nonwoven fabric (basis weight 10 g / m ² , width direction dimension 100 mm) is prepared as the hydrophilic sheet 20, and the raised surface side of the substrate nonwoven fabric 11 and the hydrophilic sheet 20 coated with the hot melt adhesive are attached. Adhere to obtain a highly absorbent sheet 10. Next, the highly absorbent sheet 10 is arranged so that the raised surface of the substrate nonwoven fabric 11 is on the outside (the raised surface is arranged under the substrate nonwoven fabric 11), leaving a central portion of 60 mm and centering 20 mm on each side. Folded for. In this way, the absorber described in Example 1 was obtained.
In Example 2, the same as in Example 1 except that an air-through non-woven fabric having a width direction of 104 mm was used as the base non-woven fabric, the central portion of the completed high-absorption sheet was 60 mm, and the left and right sides were folded 27 mm toward the center. To prepare an absorber, which was used as a sample of Example 2.
In Example 3, the same as in Example 1 except that an air-through non-woven fabric having a width direction of 90 mm was used as the substrate non-woven fabric, the central portion of the completed high-absorption sheet was 60 mm, and the left and right sides were folded 15 mm toward the center. To prepare an absorber, which was used as a sample of Example 3.
In Example 4, an absorber was prepared in the same manner as in Example 1 except that an air-through nonwoven fabric having a basis weight of 150 g / m ² (dimension in the width direction of 100 mm) was used as the substrate nonwoven fabric, and the sample was prepared in the same manner as in Example 4. did.
In Example 5, the same as in Example 1 except that an air-through non-woven fabric having a width direction of 78 mm was used as the base non-woven fabric, the central portion of the completed high-absorption sheet was 60 mm, and the left and right sides were folded 9 mm toward the center. To prepare an absorber, which was used as a sample of Example 5.

In Comparative Example 1, the absorbent body was prepared in the same manner as in Example 1 except that the highly absorbent sheet 10 was prepared using the substrate nonwoven fabric 11 having a width direction of 60 mm and the hydrophilic sheet 20 and arranged without folding. It was prepared and used as a sample of Comparative Example 1.
In Comparative Example 2, the same as in Example 1 except that an air-through non-woven fabric having a width direction of 68 mm was used as the substrate non-woven fabric, the central portion of the completed high-absorption sheet was 60 mm, and the left and right sides were folded 4 mm toward the center. To prepare an absorber, which was used as a sample of Comparative Example 2.
In Comparative Example 3, the same as in Example 1 except that an air-through non-woven fabric having a width direction of 120 mm was used as the base non-woven fabric, the central portion of the completed high-absorption sheet was 60 mm, and the left and right 60 mm were folded toward the center. To prepare an absorber, which was used as a sample of Comparative Example 3.

Further, in Comparative Example 4, the air-through non-woven fabric (basis weight 20 g / m ² ) / high-absorbent polymer 12 (basis weight 280 g / m ² ) / air-through non-woven fabric (basis weight 20 g / m ² ) / high-absorbent polymer 12 (basis weight) A sheet (all dimensions in the width direction were 60 mm) in which 100 g / m ² ) / spunlace non-woven fabric (basis weight 20 g / m ² ) was laminated was used as an absorber. The non-woven fabric used in Comparative Example 4 was not brushed like the substrate non-woven fabric 11 used in Example 1.

Further, the absorption those covered in Comparative Example 5, the superabsorbent polymer 12 (basis weight 380 g / ^{m 2)} and fluff pulp (basis weight 400 g / ^{m 2)} tissue of a mixture of paper (16g / ^{m 2)} Used as a body.
Further, in Comparative Example 6, the highly absorbent polymer 12 was dispersed at a basis weight of 135 g / m ² using the base non-woven fabric 11 and the hydrophilic sheet 20 having a width direction of 60 mm to prepare the highly absorbent sheet 10. An absorber was prepared in the same manner as in Example 1 except that it was arranged without folding, and used as a sample of Comparative Example 6.

[Measurement item]
Using the absorber obtained as described above, the absorption rate, the amount of reversion, the compression energy WC and the compression recovery RC were measured, and the results are shown in Table 1. The compression energy WC and the compression recovery RC were measured by the above method.

(Absorption rate)
With a pressure of 46 g / cm ² applied to the absorbers of Example 1 and each Comparative Example, 40 ml of 0.9% by mass physiological saline (37 ° C.) was poured from a cylinder having an inner diameter of 30 mm to form a physiological solution. The time (seconds) until the saline solution is absorbed on the surface of the absorber is measured as the first absorption rate. After 3 minutes have passed, 40 ml of 0.9% by mass physiological saline (37 ° C.) is injected again, and the time (seconds) until the physiological saline is absorbed on the surface of the absorber is measured as the second absorption rate. .. The smaller the value, the better the absorbency.

(Amount of reversion)
200 ml of physiological saline was poured into the absorbers of Example 1 and each Comparative Example, and 10 minutes after the water injection, the filter paper was pressure-bonded to the surface of the absorber with a load of 35 gf / cm ² and returned to the filter paper in 1 minute. Measure the amount of water. The smaller the amount of reversion, the drier the absorber.

(thickness)
The thickness of the absorbent articles of each Example and each Comparative Example was measured when no pressure was applied and when a predetermined pressure (35 g / cm ^{2 in this case} ) was applied. The thickness under a load of 35 g / cm ² is obtained as a value obtained by subtracting the height of the predetermined position of the weight itself from the height of the predetermined position of the weight when the weight is placed on the absorbent article. ..

(sensory evaluation)
With the cooperation of eight panelists, the feeling of wearing (fitting, softness) and absorbency (outside the disposable diaper) when wearing a tape-stopping type disposable diaper using each absorber of Example 1 and each comparative example The sensory evaluation was performed with two choices, "good" and "bad", for the presence or absence of leakage and the feeling of smoothness. The wearer used it for 8 hours and evaluated it in daily activities, and the results are shown in Table 1.
〇: When the number of wearers who chose "good" is 6 or more and 8 or less △: When the number of wearers who chose "good" is 3 or more and 5 or less ×: 1 wearer who chose "good" When there are one or two people, or when there is no wearer who chose "good"

The highly absorbent sheet 10 used for the absorber of the present invention uses a base non-woven fabric 11 having a brushed surface on one side. Therefore, in addition to the original bulkiness of the non-woven fabric, an appropriate thickness and softness are imparted, so that an appropriate cushioning property is generated and a fit feeling at the time of wearing can be improved. Further, the highly absorbent polymer 12 is dispersed and fixedly supported between the fibers of the raised portion of the base nonwoven fabric 11, so that urine is appropriately diffused or held in the substrate nonwoven fabric 11 around the highly absorbent polymer 12 and absorbed. Performance can also be improved.

1 Absorbent 10 Highly absorbent sheet 11 Base non-woven fabric 12 Highly absorbent polymer 13 C Bent part 20 Hydrophilic sheet 25 Top sheet 30 Back sheet 40 Three-dimensional gather

Claims (6)

An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet arranged to face the top sheet, and an absorber arranged between the top sheet and the back sheet. hand,
The absorber has a shape in which the raised surface is C-folded outward (inner tri-fold: folded back toward the center at both ends).
The grooved surface at the center of the C-fold faces the top sheet.
The distance A between both ends of the absorber is 10 to 80% of the width B of the absorber.
The absorber wraps a highly absorbent sheet composed of a base nonwoven fabric having a raised surface, a highly absorbent polymer fixedly supported between fibers of the raised portion of the substrate nonwoven fabric, and a raised surface of the highly absorbent sheet. With a hydrophilic sheet,
The highly absorbent sheet has a thickness of 0.5 mm or more and 3.0 mm or less measured under a load of 35 g / cm ² when measured in a flat state before being C-folded, and has a load of 35 g / cm ² . An absorbent article in which the thickness measured below is 30% or more and 70% or less of the thickness measured under no load. The absorbent article according to claim 1, wherein the SAP abundance ratio of the C-folded portion of the absorber is smaller than that of the non-folded portion. The base non-woven fabric is an air-through non-woven fabric, the basis weight of the base non-woven fabric is 20 g / m ² or more and 120 g / m ² or less, the thickness is 0.3 mm or more and 3.5 mm or less, and the fibers constituting the base non-woven fabric. The absorbent article according to claim 1 or 2, wherein the thickness of the non-woven fabric is 1.6 dtex or more and 14 dtex or less. The absorbent article according to any one of claims 1 to 3, wherein the highly absorbent polymer has a basis weight of 150 g / m ² or more and 1000 g / m ² or less. The absorbent article according to any one of claims 1 to 4, wherein the hydrophilic sheet is a hydrophilic non-woven fabric or tissue paper having a basis weight of 7 g / m ² or more and 45 g / m ² or less. The highly absorbent polymer is fixedly supported between the fibers of the raised portion of the substrate nonwoven fabric by a hot melt adhesive, and the content of the hot melt adhesive is 10 g / m ² or less. The absorbent article according to any one of claims 1 to 5.