JP2019092651A - Absorbent article and manufacturing method of the same - Google Patents

Abstract

To provide an absorbent article suppressed in unpleasantness due to moist at the time of wearing, and excellent in wearing feeling and absorbency, and to provide a manufacturing method of the same.SOLUTION: An absorbent article 1 is such that: an absorber 20 has an absorbent fiber and a first highly absorbent polymer; the absorbent article 1 is provided with a liquid diffusion layer sheet 40 between a top sheet 10 and the absorber 20; the liquid diffusion layer sheet 40 has a substrate nonwoven fabric 43 in which a clothing side surface is raised, a second highly absorbent polymer 44, and a hydrophilic sheet 45 for wrapping the whole; the second highly absorbent polymer 44 is carried on the raised surface of the substrate nonwoven fabric 43 by an adhesive agent; a basis weight of the substrate nonwoven fabric 43 is 40 g/mor more and 150 g/mor less; a basis weight of the second highly absorbent polymer 44 is 80 g/mor more and 200 g/mis less; and a liquid passing time of the second highly absorbent polymer 44 in a gel state is 130 seconds or less.SELECTED DRAWING: Figure 2

Description

  TECHNICAL FIELD The present invention relates to an absorbent article and a method of manufacturing an absorbent article in which discomfort due to moisture when worn is suppressed and which has excellent wearing feeling and absorbability.

  In general, adult paper diapers include a taping type, a pants type, and the like, and these disposable diapers are appropriately selected and used according to the degree of need for care in the excretion of the user. These absorbent articles are composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the two sheets. By adopting such a configuration, body fluid such as urine passes through the top sheet of the absorbent article and is absorbed by the absorbent body, so that it does not leak to the outside by the back sheet.

  Absorbent articles such as taping type and pants type disposable diapers may be used either alone or in combination with a urine absorbing pad on the inner side. It is common practice to use the take-up pad over the top sheet. This is because the cost per disposable diaper is high, and it is necessary to replace only the urine absorbing pad after absorbing and holding excrement with a urine absorbing pad which is cheaper than a taped type or underpants type disposable diaper. Therefore, even after excretion, it is not necessary to replace the more expensive taping-type disposable diapers and pants-type disposable diapers, and the absorbent article can be used at economically low cost. Although the condition of the wearer of the urine absorption pad is various, in the case of the condition that can be performed daily, the wearer often acts on a daily basis while wearing the urine absorption pad. In such a case, the urine absorbing pad is required to have absorbability which can be used safely for a long time and to be thin so as not to be conspicuous in appearance.

  By the way, an absorbent using fluff pulp and a super absorbent polymer (also referred to as Super Absorbent Polymer or SAP) as an absorbent to be absorbed by an absorbent article, and a substrate and an object mainly for thinning. It is common to use either a so-called super absorbent sheet (also referred to as SAP sheet) consisting of non-woven fabric and super absorbent polymer. Moreover, in order to make use of each characteristic, using together the absorbent body and super absorbent sheet which consist of fluff pulp and super absorbent polymer is also examined.

  For example, Patent Document 1 discloses a disposable absorbent article having an absorbent between a liquid-permeable top sheet and a liquid-impermeable back sheet, the absorbent comprising a superabsorbent polymer powder. A superabsorbent sheet containing no pulp fiber, and a fiber assembly layer similar to the structure of a conventional absorbent containing a superabsorbent polymer powder and pulp fibers from the top sheet side, and The sheet-like water absorbing layer includes a plurality of superabsorbent polymer powder existing areas including the superabsorbent polymer powder, and a superabsorbent polymer powder nonexistent area formed between adjacent superabsorbent polymer powder present areas. A disposable absorbent article is disclosed, characterized in that Furthermore, in the absorbent article, the thickness of the superabsorbent sheet is increased by the swelling of the superabsorbent polymer, whereby the space between the fiber assembly layer and the skin of the wearer is increased, thereby effectively reversing the body fluid. It is stated that it can be suppressed.

JP 2004-275225 A

  However, in the absorbent article described in Patent Document 1, even if it is possible to suppress the reversion of body fluid such as urine, a gap is generated in the longitudinal direction between the non-existing region and the existing region of the superabsorbent polymer powder. become. Therefore, there is a possibility that the change in thickness before and after absorption of body fluid such as urine is more easily felt, and the wearing feeling may be reduced. In addition, since the high-absorbent polymer powder is sealed by bonding the high-absorbent polymer non-woven fabric in the absence region of the high-absorbent polymer powder and sealing the high-absorbent polymer powder, the swellable volume of the high-absorbent polymer powder is limited. There was a problem that the absorption performance of the expensive superabsorbent polymer powder could not be fully utilized.

  Further, in the superabsorbent sheet used in the absorbent article of Patent Document 1, when the superabsorbent polymer is present at a high density, in the case of repeated use, so-called gel blocking slows the absorption speed, and the absorptivity It might have fallen. Furthermore, due to the decrease in absorption rate and gel blocking, there may be a feeling of discomfort due to moisture when worn.

  Accordingly, the present invention has been made in view of the above problems, and provides an absorbent article and a method of manufacturing an absorbent article, in which the discomfort due to moisture when worn is suppressed, and the wearing feeling and the absorbability are excellent. With the goal.

  The inventor of the present invention has conducted intensive studies in view of the above problems. As a result, a liquid diffusion layer sheet is provided between the absorber and the top sheet, and the liquid diffusion layer sheet is composed of a base non-woven fabric in which the garment side surface is raised, a highly absorbent polymer, and a hydrophilic sheet wrapping the whole. Has a structure in which a highly absorbent polymer is supported by an adhesive on the raised surface of the base non-woven fabric, and further, as a highly absorbent polymer used for a liquid diffusion layer sheet, the passing time in the gel state is within a predetermined range It has been found that the above-mentioned problems can be solved by using a superabsorbent polymer which is the above, and the present invention has been completed. Specifically, the present invention provides the following.

(1) A first aspect of the present invention is an absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the top sheet and the back sheet. The absorbent comprises an absorbent fiber and a first high absorbent polymer, and the absorbent article is provided with a liquid diffusion layer sheet between the top sheet and the absorbent. The liquid diffusion layer sheet has a base non-woven fabric having a raised surface on the garment side, a second highly absorbent polymer, and a hydrophilic sheet that wraps the whole, and the second non-woven fabric has the second raised surface. The superabsorbent polymer is carried by an adhesive, and the basis weight of the non-woven fabric substrate is 40 g / m ² or more and 150 g / m ² or less, and the second superabsorbent polymer has a basis weight of 80 g / m ² or more 200 g / m ² or less, the second high absorption It is an absorbent article whose pouring time in a gel state of a polymer is 130 seconds or less.

  (2) The second aspect of the present invention is the absorbent article according to (1), wherein the liquid diffusion layer sheet is short at a position 10 cm or less on the front side from the longitudinal center of the absorbent article It has a substantially strip-shaped superabsorbent polymer non-supporting region not supporting the second superabsorbent polymer in the hand direction, and the longitudinal dimension of the region is 7 cm or less. .

  (3) The 3rd mode of the present invention laminates a back sheet, an absorber, a liquid diffusion layer sheet, and a top sheet in order of the first process which manufactures a liquid diffusion layer sheet, and the clothes side. And a second step of fixing a part or the entire periphery of the top sheet and the back sheet, and in a first step, one surface of the base nonwoven fabric is subjected to a raising treatment, and then to the raised surface of the base nonwoven fabric The second superabsorbent polymer is quantitatively supported on-line, and in the second step, the liquid diffusion layer sheet is disposed with the napped surface of the base non-woven fabric facing the garment side, (1) or It is a manufacturing method of the absorbent article as described in (2).

In the present invention, a liquid diffusion layer sheet is provided between the top sheet and the absorber, and the liquid diffusion layer sheet is composed entirely of a base non-woven fabric having a raised surface on the garment side and a second highly absorbent polymer. The second highly absorbent polymer is supported by an adhesive on the raised surface of the base non-woven fabric, and the basis weight of the base non-woven fabric is 40 g / m ² or more and 150 g / m ² or less. Because the liquid passing time in the gel state of the second superabsorbent polymer is 130 seconds or less, according to the present invention, the unpleasant feeling due to the wetness when worn is suppressed, and the absorbability is excellent in the wearing feeling and the absorbability Articles and methods of making absorbent articles can be provided.

It is a top view of the absorbent article of the present invention. It is _X 1 -X ₁ cross-sectional view in FIG. 1 of the absorbent article of the present invention. It is drawing which shows the manufacturing method of the liquid diffusion layer sheet used for the absorbent article of this invention. It is drawing which shows the aspect provided with the highly absorbent polymer carrying | support area | region and the superabsorbent polymer non-carrying | support area | region in the flow direction.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the attached drawings. The same elements are denoted by the same reference numerals or symbols throughout the description of the embodiments of the present invention.

  In the description of the present specification, the wearing of the absorbent article 1 refers to at least one of the wearing of the absorbent article 1 and after the wearing. The longitudinal direction of the absorbent article 1 is a direction extending in the front and back of the wearer when worn, and is a direction indicated by Y in the figure. In the present specification, the front side refers to the front direction in the longitudinal direction when worn, and the rear side refers to the opposite direction to the front side. On the other hand, the short direction of the absorbent article 1 is a direction transverse or perpendicular to the longitudinal direction, and is a direction represented by X in the drawing. Furthermore, the body side surface is a surface disposed on the skin side of the wearer at the time of wearing, of the front and back sides of each member such as the absorber 20, and the clothing side surface is a surface of each member such as the absorber 20. It is a surface which is turned to the side opposite to a wearer's skin side at the time of wearing among front and back both sides.

<Absorbent article>
FIG. 1 is a plan view of the absorbent article 1 of the present invention, and FIG. 2 is a cross-sectional view of the absorbent article of the present invention taken along line X ₁ -X _{1 in} FIG. The absorbent article 1 of the present invention comprises a liquid-permeable top sheet 10 disposed on the body side, a liquid-impermeable back sheet 30 disposed on the garment side facing the top sheet 10, and the top sheet 10. And an absorbent body 20 disposed between the back sheet 30. Furthermore, since the liquid diffusion layer sheet 40 is provided between the top sheet 10 and the absorber 20, body fluid with urine or the like is absorbed by the absorber 20 through the top sheet 10 and the liquid diffusion layer sheet 40. . Further, in the present invention, the absorbent article 1 can be suitably used by being superimposed on a disposable diaper or a disposable diaper of tape type.

  Further, the shape of the absorbent article 1 is not particularly limited, but may be a substantially wedge shape having a narrow portion at the short side end of the longitudinal central portion as shown in FIG. 1 or a substantially rectangular shape. The dimension of the absorbent article 1 in the longitudinal direction is preferably 450 mm or more and 720 mm or less, and the dimension in the transverse direction is preferably 190 mm or more and 320 mm or less. By setting the dimensions in the longitudinal direction and the transverse direction of the absorbent article 1 in such a range, it is possible to provide the absorbent article 1 of an appropriate size, such as a tape-type or pants-type paper diaper, or a light incontinence pad. In addition, when used in combination with other absorbent articles as a urine absorbing pad, the absorbent article 1 can be provided according to the mode, size, and shape of the absorbent article to be worn.

[Absorber]
The absorbent body 20 contains an absorbent fiber as a substrate and a first superabsorbent polymer. The absorbent fiber is not particularly limited as long as it is generally used for absorbent articles such as sanitary napkins, paper diapers and urine absorbing pads, and examples thereof include fluff pulp, cotton, rayon, acetate, tissue, absorbent paper, hydrophilic And the like. Among these, it is preferable to use fluff pulp from the viewpoint of absorbability. As such fluff pulp, mention may be made of those obtained by disintegrating wood pulp (softwood, hardwood), non-wood pulp or the like into a cotton-like form. The absorbent fiber of the absorbent body 20 preferably has a basis weight of 100 g / m ² or more and 400 g / m ² or less in order to thin the film without losing the absorption performance and the touch.

The first superabsorbent polymer is not particularly limited as long as it can absorb body fluid and prevent backflow, and is based on sodium polyacrylate, polyaspartate, and (starch-acrylic acid) graft co-polymer. Those formed from materials such as polymers, (acrylic acid-vinyl alcohol) copolymers, (isobutylene-maleic anhydride) copolymers and their saponified products can be used. Among these, sodium polyacrylates are preferred from the viewpoint of the amount of absorption per weight. The first superabsorbent polymer preferably has a basis weight of 25 g / m ² or more and 300 g / m ² or less so as not to impair the absorption performance and the touch, and 10% by mass or more to 50% of the total amount of the absorbent 20 It is preferable to set it as content of mass% or less.

  The thickness of the absorber 20 is preferably 1 mm or more and 5 mm or less, and more preferably 2 mm or more and 3 mm or less. Thus, by adjusting the thickness of the absorber 20, the fall of the wearing feeling by the thickness of the absorber 20 can be suppressed. When the thickness of the absorbent body 20 is less than 1 mm, it is difficult to form a uniform fiber mat, and when the thickness is more than 5 mm, the wearer feels uncomfortable when sitting or standing and the wearing feeling is reduced. There is a case. In addition, it is preferable that the dimension of the longitudinal direction of the absorber 20 is 250 mm or more and 670 mm or less, and the dimension of a transversal direction is 100 mm or more and 300 mm or less.

Liquid Diffusion Layer Sheet
In the absorbent article 1 of the present invention, as shown in FIG. 1 and FIG. 2, a liquid diffusion layer sheet 40 is provided between the top sheet 10 and the absorber 20. In addition, as shown in FIG. 2, the liquid diffusion layer sheet 40 has a base non-woven fabric 43 in which the surface on the garment side is raised, a second highly absorbent polymer 44, and a hydrophilic sheet 45 wrapping the whole. The second superabsorbent polymer 44 is supported by an adhesive on the raised surface of the base nonwoven fabric 43.

  As described above, the second highly absorbent polymer 44 is carried on the raised surface of the base nonwoven fabric 43, and the base nonwoven fabric 43 is raised, thereby adding softness to the bulkiness of the nonwoven fabric itself. By being provided, a suitable cushioning property generate | occur | produces and a wearing feeling can be improved. In addition, since the liquid diffusion layer sheet 40 does not have absorbent fibers such as fluff pulp, it is possible to suppress reversion and to suppress discomfort due to moisture. The liquid diffusion layer sheet 40 preferably has a dimension of 250 mm or more and 670 mm or less, a dimension of 100 mm or more and 160 mm or less, and a thickness of 1 mm or more and 8 mm or less. Since the liquid diffusion layer sheet 40 has appropriate cushioning properties as described above, by adjusting the thickness to the above range, it can be made thinner while maintaining the cushioning properties when processed into an absorbent article, and liquid diffusion It is possible to suppress a decrease in the feeling of wearing due to the thickness of the layer sheet 40 and the hardness of the highly absorbent polymer.

Further, when the liquid diffusion layer sheet 40 is disposed so that the raised surface of the base nonwoven fabric 43 faces the body side, a large amount of urine is carried on the raised surface of the base nonwoven fabric 43 without interposing the base nonwoven fabric 43 at one time. As a result, the second superabsorbent polymer 44 may cause gel blocking, and the absorption rate may decrease. Therefore, in the absorbent article 1 of the present invention, in order to suppress the occurrence of gel blocking and improve the absorption speed, the liquid diffusion layer sheet 40 is disposed such that the napped surface of the base nonwoven fabric 43 faces the garment side. ing. By arranging the liquid diffusion layer sheet 40 in this manner, the second superabsorbent polymer 44 dispersed in the fibers via the raised fibers while diffusing the body fluid such as urine in the planar direction of the base nonwoven fabric 43. Since it is absorbed, it is possible to suppress the occurrence of gel blocking, and furthermore, a body fluid such as urine which can not be absorbed by the second superabsorbent polymer 44 is led to the absorber 20 and reliably absorbed. 1 Absorbability as a whole can be improved. In addition, since the occurrence of gel blocking is suppressed and the absorption rate is good, discomfort due to moisture can be suppressed.
In addition, the superabsorbent sheet generally has a structure in which the superabsorbent polymer is supported on at least two non-woven fabrics, and when a liquid diffusive sheet made of non-woven fabrics is used, at least three of them are used. Although a non-woven fabric is required, in the present invention, in the liquid diffusion layer sheet 40, the base non-woven fabric 43 is formed of only one sheet and functions as a superabsorbent sheet, so that the cost can be suppressed.
Moreover, although the second superabsorbent polymer 44 and the absorber 20 which actually absorb body fluid such as urine tend to cause moisture, in the present invention, the base nonwoven fabric 43 has a void due to raising. A layer is formed, and by the presence of the layer of the above-mentioned void between the second superabsorbent polymer 44 and the top sheet, and between the absorbent 20 and the top sheet 10, the skin becomes the top sheet 10 Even when touching, it is hard to cause discomfort due to moisture, and the feeling of wearing can be improved.

  In the present invention, as the base non-woven fabric 43, for example, non-woven fabrics such as air through non-woven fabric, point-bonded non-woven fabric, spun-bonded non-woven fabric, melt-blown non-woven fabric, spun bonded non-woven / melt blown non-woven, spun bonded non-woven / melt blown non-woven / spun bonded non-woven fabric Composite non-woven fabrics can be mentioned. It is preferable to use the air through nonwoven fabric which is easy to obtain bulkiness among these nonwoven fabrics.

The thickness of the base nonwoven fabric 43 is preferably 0.3 mm or more and 7.0 mm or less, and more preferably 2.0 mm or more and 5.0 mm or less, from the viewpoint of the balance between the wearing feeling and the absorption performance. The basis weight of the base nonwoven fabric 43 is 40 g / m ² or more and 150 g / m ² or less from the viewpoint of transferability of body fluid such as urine to the surface subjected to the raising treatment and productivity.

  Furthermore, the thickness of the fibers constituting the base nonwoven fabric 43 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 further preferred that By adjusting the thickness of the fibers constituting the base nonwoven fabric 43 within the above range, the base nonwoven fabric 43 can be easily raised, and the second highly absorbent polymer 44 can be easily dispersed and supported between the fibers of the raised portions. can do.

(Second superabsorbent polymer)
As the second superabsorbent polymer 44, the same material as that of the absorber 20 can be used. The basis weight of the second superabsorbent polymer 44 is 80 g / m ² or more and 200 g / m ² or less. Further, in terms of the balance between the absorption performance and the wearing feeling, the basis weight of the second superabsorbent polymer 44 is preferably 100 g / m ² or more and 160 g / m ² or less. In the case where the liquid diffusion layer sheet 40 is provided with a superabsorbent polymer-supported region 41 and a superabsorbent polymer non-supported region 42 described later, the basis weight of the second superabsorbent polymer 44 corresponds to the superabsorbent polymer supported. The basis weight in the region 41 is used. By adjusting the basis weight of the second superabsorbent polymer 44 to the above range, the liquid diffusion layer sheet 40 can appropriately introduce the body fluid such as urine to the absorber 20 while absorbing the body fluid such as urine appropriately As a result, the absorbability of the absorbent article 1 can be improved. When the basis weight of the second superabsorbent polymer 44 is less than 80 g / m ² , discomfort due to moisture is likely to occur due to the decrease in absorption performance, and when it exceeds 200 g / m ² , absorption is caused The subsequent absorbent article 1 becomes thick, and the wearing feeling tends to be reduced.

  In addition, from the viewpoint of enhancing the basic performance on absorption and avoiding the rough feel by avoiding fine powder having poor fluidity as powder, the median particle diameter of the second superabsorbent polymer 44 is And 50 μm or more and 600 μm or less, and more preferably 100 μm or more and 500 μm or less.

(Flow time of second superabsorbent polymer)
In the present invention, the passing time in the gel state of the second superabsorbent polymer 44 is 130 seconds or less. By setting the liquid passage time in the gel state of the second superabsorbent polymer 44 to 130 seconds or less, it becomes easy to lead body fluid such as urine to the absorber 20, and gel blocking can be suppressed when repeatedly absorbed, and absorbability Can be improved, and discomfort due to moisture can be suppressed. The liquid flow time can be measured by the following method with reference to the method described in Patent 5629529. First, 0.32 g of the second superabsorbent polymer 44 is swollen by immersion in 150 ml of 0.9% saline solution for 30 minutes. The swollen second superabsorbent polymer 44 is then transferred with saline solution into a cylindrical tube with a 150 mesh wire mesh and cock at the bottom, with an inner diameter of 25.4 mm and a height of 40 cm, and then vertical A 100 mesh wire mesh with the same inner diameter as the cylindrical tube is placed in a cylindrical crucible, and a weight is placed on the shaft so that a load of 21 g / cm ² is applied. Next, open the cock and measure the time required for the liquid level in the cylindrical tube to go from 60 ml to 40 ml. The difference between this time and the time separately measured with the same procedure without using the high-absorptive polymer alone is defined as the passing time (second). By using such a superabsorbent polymer, it is possible to prevent the diffusion of body fluid such as urine to the lower layer from being delayed by gel blocking. Moreover, it is preferable to use a pulverization type super-absorbent polymer rather than a sphere from the viewpoint of liquid flow time.

(Superabsorbent polymer non-supported area)
As shown in FIG. 1, the liquid diffusion layer sheet 40 has a substantially strip-like height that does not carry the second superabsorbent polymer 44 in the short direction at a position 10 cm or less on the front side from the longitudinal center of the absorbent article 1. It is preferable to have the absorbent polymer non-supporting area 42, and the longitudinal dimension of the area is preferably 7 cm or less. The region supporting the second superabsorbent polymer 44 of the liquid diffusion layer sheet 40 is referred to as a superabsorbent polymer-supporting region 41. In addition, as described later, in the manufacturing process of the liquid diffusion layer sheet 40, it is preferable to cut the non-superabsorbent polymer non-supporting region 42 so as not to damage the cutting blade. When the diffusion layer sheet 40 is disposed, as shown in FIG. 1, both ends in the longitudinal direction of the liquid diffusion layer sheet 40 become the non-superabsorbent polymer-supporting region 42.

  When worn by the superabsorbent polymer non-supporting region 42 located between the two superabsorbent polymer-supporting regions 41 being provided at a position 10 cm or less on the front side from the longitudinal center of the absorbent article 1 A superabsorbent polymer non-supporting area 42 is provided at the lower part of the urination port, and diffusion of body fluid such as urine in the width direction can be improved, and body fluid such as urine is rapidly led to the absorber 20. Can improve the absorbability. Since the above-mentioned position where the superabsorbent polymer non-supporting area 42 is provided is a site where body pressure of the crotch is hard to be applied, it is difficult for discomfort to occur due to a change in thickness before and after absorption of body fluid such as urine, improving the wearing feeling It can be done.

  Further, when the dimension of the superabsorbent polymer non-supporting region 42 in the longitudinal direction is 7 cm or less, discomfort due to a change in thickness before and after absorption of body fluid such as urine is less likely to occur, and the wearing feeling can be improved. . The dimension of the superabsorbent polymer non-supported region 42 in the longitudinal direction is preferably 1 cm or more and 7 cm or less, and more preferably 3 cm or more and 5 cm or less.

The second superabsorbent polymer 44 is supported by the adhesive on the raised surface of the base nonwoven fabric 43. The adhesive is preferably a hot melt adhesive having excellent versatility. The content of the hot melt adhesive is preferably 10 g / m ² or less so as not to impair the absorbability of the second superabsorbent polymer 44 and not to damage the feel upon wearing. As a hot melt adhesive, synthetic rubbers such as styrene-butadiene-styrene copolymer and styrene-isoprene-styrene copolymer having a melting point of 100 ° C. or more and 180 ° C. or less, or ethylene-vinyl acetate copolymer And olefin based hot melt adhesives can be used.

(Hydrophilic sheet)
In the present invention, as shown in FIG. 2, the base nonwoven fabric 43 and the second superabsorbent polymer 44 are wrapped by a hydrophilic sheet 45. Thereby, the leak of the second superabsorbent polymer 44 can be prevented, and the touch upon wearing can also be improved. Examples of the hydrophilic sheet 45 include hydrophilic nonwoven fabrics such as tissue, absorbent paper, spunbonded nonwoven fabrics and air-laid nonwoven fabrics. Among these, it is preferable to use a tissue which is excellent in cost and can effectively suppress the leakage of the highly absorbent polymer. Moreover, since the tissue is extensible, it is also preferable from the viewpoint of not inhibiting the swelling of the second superabsorbent polymer 44. The basis weight of the hydrophilic sheet 45 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 18 g / m ² or less. When the liquid diffusion layer sheet 40 and the second superabsorbent polymer 44 are wrapped by the hydrophilic sheet 45, the liquid diffusion layer sheet 40 and the hydrophilic sheet 45 are fixed by a hot melt adhesive or heat embossing. It is preferable to do.

[Top sheet]
The top sheet 10 allows body fluid to pass quickly toward the inside of the absorbent article 1, and is disposed to face the back sheet 30 with the absorber 20 and the liquid diffusion layer sheet 40 interposed therebetween. The top sheet 10 is a sheet that comes in contact with the skin, so it has a soft feel and does not irritate the skin, and is a hydrophilic nonwoven fabric, an apertured film such as an apertured polyethylene film, or a foam such as urethane foam. It is formed from a film or a composite sheet in which these are laminated. The top sheet 10 may be a single layer or a plurality of layers, and a large number of through holes may be formed in order to impart dry touch properties.

  In addition, as the hydrophilic non-woven fabric having the above-mentioned properties, a thermal bonding method, an air through method, a spun lace method, using synthetic fibers such as polypropylene and polyethylene, regenerated fibers such as rayon, and natural fibers such as cotton. What was obtained by publicly known processing methods, such as a spun bond method, can be used.

The basis weight of the top sheet 10 is preferably 15 g / m ² or more and 40 g / m ² or less in terms of processability and strength. The top sheet 10 may be coated with a lotion, an antioxidant, an anti-inflammatory component, a pH adjuster, an antibacterial agent, a moisturizing agent, or the like in order to reduce skin irritation.

[Back sheet]
As the back sheet 30 used in the present invention, a sheet material that is liquid impermeable and has a water blocking property is used, but it may have moisture permeability for the purpose of preventing bleeding. As a material of the back sheet 30 which has such a characteristic, thin plastic sheets, such as a polyethylene sheet and a polyethylene lamination nonwoven fabric, can be mentioned, for example. Further, the basis weight of the back sheet 30 is preferably 15 g / m ² or more and 60 g / m ² or less from the viewpoint of processability and strength. The clothes side surface of the back sheet 30 may be provided with a fixing member for preventing displacement at the time of wearing. Although it does not specifically limit as a base material of a fixing member, It is preferable that it is a mechanical hook tape or an adhesive. Moreover, you may have the peeling sheet for protecting a fixing member.

(3D gather)
The absorbent article 1 of the present invention is preferably provided with a three-dimensional gather 60 at both ends in the short direction. By providing the solid gathers 60 at both ends in the short direction, leakage of body fluid such as urine from the short direction can be effectively prevented. As the three-dimensional gather 60, a water-repellent or liquid-impervious sheet formed of hydrophobic fibers, for example, a spunbond nonwoven, a meltblown nonwoven, a polyethylene film can be used. It is also possible to use one selected appropriately from these base materials and double bonded. The basis weight of the solid gather 60 is preferably 15 g / m ² or more and 100 g / m ² or less from the viewpoint of processability and strength.

(Elastic elastic member)
Preferably, the solid gather 60 has at least one stretchable elastic member along the longitudinal direction on the free end side and the proximal end side. By providing the stretchable elastic member along the longitudinal direction, the three-dimensional gathers 60 have standing ability, can be deformed according to the wearer's body shape, and the fit improves, so that leakage of body fluid such as urine is possible. Can be effectively prevented. As the stretchable elastic member, for example, a polyurethane yarn, a strip-like polyurethane film, a thread-like or strip-like natural rubber or the like is used.

  It is preferable that the free end of the solid gather 60 be fixed on the top sheet 10 at both ends in the longitudinal direction of the absorbent article 1, so the inner side surface of the solid gather 60 is the top sheet 10. It is preferable to be in contact with the body surface of the body. As a result, the solid gather 60 is erected only at the portion excluding both longitudinal end portions.

<Production Method of Absorbent Article>
The absorbent article 1 of the present invention includes, for example, the first step of producing the liquid diffusion layer sheet 40, and the back sheet 30, the absorber 20, the liquid diffusion layer sheet 40, and the top sheet 10 in this order from the clothing side. , And a second step of fixing the top sheet 10 and a part or the entire circumference of the back sheet 30. In the second step, the napped surface of the base nonwoven fabric 43 is disposed on the garment side. In the description of the method for producing the absorbent article 1 of the present invention, the flow direction refers to the direction in which the base nonwoven fabric 43 travels in the production of the liquid diffusion layer sheet 40 and the absorbent article 1. Also, the width direction is a direction transverse or perpendicular to the flow direction.

  Hereinafter, the first process described above will be described with reference to FIG. FIG. 3 is a drawing showing a method of manufacturing the liquid diffusion layer sheet 40. As shown in FIG. In the first step, as shown in FIG. 3, after the step A of raising the one surface of the base nonwoven fabric 43 and the step A, an adhesive is applied to the raised surface of the base nonwoven 43 and one surface of the hydrophilic sheet 45. After the step B of applying and the step B, a step C of inserting the second highly absorbent polymer 44 while bonding the surfaces of the base nonwoven fabric 43 and the hydrophilic sheet 45 to which the adhesive is applied, and after the step C , And a step D of wrapping the whole with a hydrophilic sheet 45.

(Step A)
Step A is a step of raising one surface of the base nonwoven fabric 43. In step A, as shown in FIG. 3, the base nonwoven fabric 43 which is fed from an unreel portion (not shown) for unwinding the raw nonwoven fabric and travels at a line speed V1 is substantially parallel to the flow direction of the base nonwoven fabric 43. Thus, one side of the base nonwoven fabric 43 is in contact with the surface of the base nonwoven fabric 43 while rotating in the flow direction at a rotational speed V2 that is more than the line speed V1. It is a process of raising the surface. The line speed V1 is not particularly limited, but is preferably 50 m / min to 300 m / min, and more preferably 100 m / min to 200 m / min in order to ensure appropriate productivity.

[Step B]
In step B, after step A, an adhesive is applied to the napped surface of the base nonwoven fabric 43 and one surface of the hydrophilic sheet 45 by the first adhesive application device 200A and the second adhesive application device 200B, respectively. It is a process. The application pattern by the first adhesive application device 200A and the second adhesive application device 200B is not particularly limited, but the entire surface is applied in a spiral, a fine fiber shape, a stripe having a width, a dot shape, an omega shape, etc. It can be applied to the pattern of

[Step C]
In step C, after the step B, while bonding the surfaces of the base non-woven fabric 43 and the hydrophilic sheet 45 to which the adhesive is applied, the second superabsorbent polymer 44 is bonded by the superabsorbent polymer spraying device 300 It is a step of quantitatively loading on-line toward the coated surface. The superabsorbent polymer spraying device 300 is not particularly limited, and a known feeder which can be used for powder such as a screw feeder, a rotary feeder, a vibrating feeder and the like can be used.

[Step D]
The step D is a step of wrapping the whole with the hydrophilic sheet 45 by the hydrophilic sheet folding apparatus 400 after the step C. First, before entering the hydrophilic sheet folding apparatus 400, an adhesive is applied along the longitudinal direction to one lateral end of the hydrophilic sheet 45 using the third adhesive applying apparatus 200C. The dimension of the hydrophilic sheet 45 in the width direction is twice or more the dimension of the width direction of the base nonwoven fabric 43, and in the hydrophilic sheet folding apparatus 400, the base nonwoven fabric 43 starts from both widthwise ends of the base nonwoven fabric 43. The hydrophilic sheet 45 in the non-overlapping part is folded along the flow direction of the base nonwoven fabric 43, and the part where the hydrophilic sheet 45 is folded is fixed with a previously applied adhesive.

  The liquid diffusion layer sheet 40 produced in this manner is sandwiched between the top sheet 10 of the absorbent article 1 and the absorbent body 20, and is incorporated into the absorbent article 1. The liquid diffusion layer sheet 40 is cut in the flow direction as shown in FIG. 4 because the size of the absorbent article 1 to be finally incorporated and the superabsorbent polymer non-supporting area 42 are cut to a predetermined position and size. Preferably, a superabsorbent polymer support region 41 and a superabsorbent polymer non-support region 42 are provided. In addition, when cutting, it is preferable to cut the superabsorbent polymer non-supporting region 42 so as not to damage the cutting blade. In this case, when the liquid diffusion layer sheet 40 is disposed on the absorbent article 1 As shown in FIG. 1, both ends in the longitudinal direction of the liquid diffusion layer sheet 40 become the non-superabsorbent polymer-supporting regions 42.

  Although the present invention has been described above using the embodiment, 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 embodiment, and various modifications or changes may be made to the above embodiment. It will be apparent to one skilled in the art that improvements can be made. It is also apparent from the scope of the claims that the embodiments added with such alterations or improvements can be included in the technical scope of the present invention.

  Hereinafter, the present invention will be described in detail by way of examples. The present invention is not limited to the examples shown below.

[Examples 1 to 4, Comparative Example 1]
The absorbent article using the following liquid-diffusion layer sheet was produced, and monitor evaluation was performed.

(Liquid diffusion layer sheet)
Prepare an air through nonwoven fabric (dimension 14 cm in the width direction, a basis weight of 90 g / m ² ) as the substrate nonwoven fabric, and raise the surface of one surface of the substrate nonwoven physically by the method described above A hot melt adhesive is applied to a spunbonded nonwoven fabric, a dimension of 30 cm in the width direction, and a basis weight of 13 g / m ² ), and the ^second coated superabsorbent polymer is coated by a superabsorbent polymer spraying device while bonding the coated surfaces. The adhesive was applied to the coated side and carried quantitatively on line. When the second superabsorbent polymer is supported, the superabsorbent polymer supporting region and the superabsorbent polymer non-supporting region are provided by intermittently supporting the second superabsorbent polymer, and further, the superabsorbent polymer is sequentially absorbed from the flow direction. Porous polymer non-supporting area (flow direction dimension 5 cm), super absorbent polymer supporting area (flow direction dimension 13 cm), super absorbent polymer non-supporting area (longitudinal dimension 3 cm), super absorbent polymer supporting area (flow A pattern of 23 cm in the directional dimension and 5 cm in the superabsorbent polymer non-supporting area (5 cm in the flow direction) is prepared and cut at the center of the 5 cm wide superabsorbent polymer unsupported area in the flow direction at both ends of each pattern. From the front in the longitudinal direction, the non-absorbent polymer non-supporting area (long dimension 2.5 cm), the super-absorbent polymer supporting area (flowing dimension 13 cm), super absorbent Total longitudinal dimension of the non-rimer non-bearing area (longitudinal dimension 3 cm), high-absorptive polymer-bearing area (flow direction dimension 23 cm), super-absorptive non-bearing polymer area (flow direction dimension 2.5 cm) A substantially rectangular liquid diffusion layer sheet having a size of 44 cm and a widthwise direction of 14 cm was obtained.
(Absorbent articles)
Next, with respect to the liquid diffusion layer sheet thus obtained, the fluff pulp and the first highly absorbent polymer prepared in advance, with the napped surface of the base non-woven fabric of the liquid diffusion layer sheet facing the garment side. Absorbent body (dimension 45 cm in the longitudinal direction, maximum dimension in the transverse direction is 23 cm, minimum dimension in the transverse direction located near the longitudinal center is 14 cm, and has a narrowing at the transverse end of the longitudinal central portion It was arranged on the body side of a substantially bowl shape and an area of 0.082 m ² ). The first superabsorbent polymer was adjusted to have a basis weight of 121 g / m ² and a content of 40% by mass with respect to the absorber. Next, on the back sheet (air-permeable polyethylene film, basis weight 32 g / m ² ) coated with a hot melt adhesive, the above-mentioned absorber and liquid diffusion layer sheet are disposed in this order, and further a top sheet (air through nonwoven fabric, The basis weight was 20 g / m ² ). In this manner, the absorbent articles of Examples 1 to 4 and Comparative Example 1 in the width direction of 29 cm and the length direction of 53 cm (substantially wedge shape having a constriction at the end portion in the width direction of the central portion in the longitudinal direction) were obtained. . When the liquid diffusion layer sheet is disposed on the absorbent article, the front end of the non-superabsorbent polymer non-supporting area provided between the two superabsorbent polymer supporting areas is from the longitudinal center of the absorbent article. It arranged so that it might be set to 3.5 cm on the front side.

  With respect to the absorbent articles of Examples 1 to 4 and Comparative Example 1 obtained in this manner, the liquid passage time and basis weight in the gel state of the superabsorbent polymer used for the liquid diffusion layer sheet are shown in Table 1, and the following monitors The evaluation was performed and the results are shown in Table 1.

(Monitor evaluation)
150 ml of 0.9% saline is poured into the center of the absorbent article three times at intervals of 5 minutes using a graduated cylinder, and after pouring for the third time, touch the surface after 5 minutes to see if the surface is moist The following criteria were used by 10 panelists to evaluate the feeling of wear. In addition, と し た and を were accepted.
○: When "does not feel wet" is 8 or more and 10 or less な い: When "does not feel wet" is 5 or more and 7 or less ×: Does not have "do not feel wet" or 4 or less When

  From the above results, it is understood that the use of the absorbent article of the present invention makes it possible to suppress discomfort due to moisture when worn.

DESCRIPTION OF SYMBOLS 1 Absorbent article 10 Top sheet 20 Absorbent body 30 Back sheet 40 Liquid diffusion layer sheet 41 Super-absorbent polymer carrying area 42 Super-absorbent polymer non-support area 43 Substrate non-woven fabric 44 Second super-absorbent polymer 45 Hydrophilic sheet 60 Three-dimensional Gather 100 Rotary blade 200A 1st adhesive application device 200B 2nd adhesive application device 200C 3rd adhesive application device 300 super absorbent polymer scattering device 400 hydrophilic sheet folding device

Claims (3)

An absorbent article comprising a liquid permeable top sheet, a liquid impermeable back sheet, and an absorbent disposed between the top sheet and the back sheet,
The absorbent comprises absorbent fibers and a first superabsorbent polymer,
The absorbent article is provided with a liquid diffusion layer sheet between the top sheet and the absorber.
The liquid diffusion layer sheet has a base non-woven fabric in which the surface on the garment side is raised, a second highly absorbent polymer, and a hydrophilic sheet that wraps the whole,
The second superabsorbent polymer is supported by an adhesive on the raised surface of the base nonwoven fabric,
The basis weight of the base nonwoven fabric is 40 g / m ² or more and 150 g / m ² or less,
The basis weight of the second superabsorbent polymer is 80 g / m ² or more and 200 g / m ² or less,
An absorbent article, wherein the gel permeation time of the second superabsorbent polymer is 130 seconds or less.   The liquid diffusion layer sheet is a substantially band-like superabsorbent polymer non-supporting region not carrying the second superabsorbent polymer in the short direction at a position 10 cm or less on the front side from the longitudinal center of the absorbent article. The absorbent article according to claim 1, wherein the longitudinal dimension of the region is 7 cm or less. The first step of manufacturing the liquid diffusion layer sheet, and the back sheet, the absorber, the liquid diffusion layer sheet, and the top sheet in this order from the garment side, and a part or all of the top sheet and the back sheet A second step of fixing the circumference;
In the first step, one surface of the base nonwoven fabric is subjected to a raising treatment, and thereafter, the second superabsorbent polymer is quantitatively supported on the raised surface of the base nonwoven fabric online;
The manufacturing method of the absorbent article of Claim 1 or 2 which arrange | positions a liquid-diffusion layer sheet | seat by which the napped surface of a base | substrate nonwoven fabric is made into the clothing side in a 2nd process.