WO2017061566A1

WO2017061566A1 - Sheet-like article and method for producing sheet-like article

Info

Publication number: WO2017061566A1
Application number: PCT/JP2016/079843
Authority: WO
Inventors: 亮太蔵前; ノルサレフディンビンラティフムハマド; 小林　賢司
Original assignee: 花王株式会社
Priority date: 2015-10-07
Filing date: 2016-10-06
Publication date: 2017-04-13
Also published as: DE112016004589B4; GB2557151A; CN108024887B; GB201804072D0; KR101909425B1; RU2670053C1; JP2017070498A; KR20180048708A; JP6193328B2; DE112016004589T5; GB2557151B; CN108024887A

Abstract

This sheet-like article (1) for absorbent articles is provided with a plurality of absorbent units (4), each equipped with a long base part (2) and absorbent polymer particles (3) fixed on the surface on one side of the long base part (2). The sheet-like article (1) is configured to have the respective absorbent units (4) arranged such that the longitudinal directions thereof are oriented in a single direction. Before the absorbent polymer particles (3) absorb a liquid, the absorbent polymer particles (3) are fixed on the surface of one side of the long base part (2) so as to be fixed on side edges (2s) of the long base part (2) parallel to the longitudinal direction thereof.

Description

Sheet material and method for producing sheet material

The present invention relates to a sheet-like material used for an absorbent article and a method for producing the sheet-like material.

In general, an absorbent used for absorbent articles such as disposable diapers, sanitary napkins, incontinence pads, etc. is prepared by placing an absorbent material containing pulp fibers and a water-absorbing polymer on an outer peripheral surface of a rotating drum on an air stream. It is manufactured by sucking and depositing in the formed recess, and then covering the piled body deposited in the recess with a water-permeable sheet material. However, the weight of the water-absorbing polymer is very heavy compared to the weight of the pulp fiber, and the water-absorbing polymer is likely to be non-uniformly dispersed. In such a non-uniform absorbent body, swelling inhibition such as gel blocking is likely to occur, and the absorption performance of the water-absorbing polymer cannot be maximized.

In Patent Document 1, two sheets are fixed by a plurality of fixing portions to form a channel space that is continuous in the longitudinal direction between adjacent fixing portions, and each channel space has a high water absorption property. A body fluid absorber is described in which an absorbent material in which a body fluid absorbent material containing a polymer is integrated with a shrinkable material is disposed. According to the bodily fluid absorber described in Patent Document 1, the entire absorber can be used effectively.

Moreover, in patent document 2, it has the excretion part slit area | region in which the vertical slit along a vertical direction was formed in the dispersion | distribution state in the excretion part opposing part, and has a central slit area | region in the center part of the horizontal direction and the vertical direction. An absorbent article with an absorber is described. According to the absorbent article described in Patent Document 2, it is possible to enhance the feeling of wearing.

Further, Patent Document 3 describes an absorbent article having an absorbent body in which four or more rows of slits are arranged at intervals. According to the absorbent article described in Patent Document 3, the rigidity of the absorber can be relaxed and the absorbency can be increased.

JP 2002-224162 A JP 2015-42244 A Japanese Utility Model Publication No. 63-18122

The present invention relates to a long base portion having a horizontal direction, a vertical direction longer than the horizontal direction, and a thickness direction, and water absorption fixed to the surface of one surface of the long base portion. The present invention relates to a sheet-like article for absorbent articles comprising a plurality of absorptive units each having an absorptive polymer particle, wherein each absorptive unit is arranged so that its longitudinal direction is oriented in at least one direction.
Before the water-absorbing polymer particles absorb the liquid, the water-absorbing polymer particles are fixed to the surface of the one surface of the elongate base portion, and the longitudinal direction of the elongate base portion It is being fixed to the side edge along.

In addition, the present invention is fixed to a surface of a long base portion having a horizontal direction, a vertical direction longer than the horizontal direction, and a thickness direction, and one surface of the long base portion. A plurality of absorptive units each having a water-absorbing polymer particle, wherein each of the absorptive units is arranged so that its longitudinal direction is at least in one direction, and the water-absorbing polymer particles have liquid. Prior to absorption, the water-absorbing polymer particles are fixed to the surface of the one surface of the elongate base portion and fixed to the side edge portion along the longitudinal direction of the elongate base portion. The present invention relates to a method for producing a sheet for absorbent articles. The method for producing a sheet-like product of the present invention includes a cutting step of cutting a base sheet to form a plurality of the elongated base portions, and the plurality of the elongated substrates formed in the cutting step. A widening step in which the interval between adjacent long base portions is widened at the widening portion, and a plurality of the long shapes in which the intervals between the adjacent long base portions are increased in the widening step A water-absorbing polymer particle spraying step for spraying the water-absorbing polymer particles on the substrate.

FIG. 1 is a cross-sectional view schematically showing an embodiment of a sheet-like article for an absorbent article of the present invention, and shows a state before water-absorbing polymer particles absorb liquid. FIG. 2 is a cross-sectional view schematically showing a state where the water-absorbing polymer particles swell after absorbing the liquid in the sheet-like material shown in FIG. FIG. 3 is a perspective view of the sheet-like material shown in FIG. 1 viewed from the upper surface side. FIG. 4 is a schematic view showing an embodiment of the sheet-like product manufacturing apparatus shown in FIG. FIG. 5 is a schematic perspective view of the base sheet cut portion included in the manufacturing apparatus shown in FIG. 4. FIG. 6 is a schematic perspective view of the widened portion of the manufacturing apparatus shown in FIG. FIG. 7 is a perspective view of another embodiment of the sheet-like material of the present invention viewed from the upper surface side, and shows a state before the water-absorbing polymer particles absorb the liquid (corresponding to FIG. 3).

Detailed Description of the Invention

In the absorber described in Patent Document 1, an absorbent material containing a highly water-absorbing polymer is disposed in each channel space formed by being fixed by a fixing portion, so that the highly water-absorbing polymer absorbs body fluid. Even if it swells, it is difficult to move in the thickness direction, and the absorption performance of the superabsorbent polymer cannot be maximized.

In

Patent Documents

2 and 3, there is no description regarding the position where the water-absorbing polymer is fixed to the member formed by the slit.

Therefore, it is an object of the present invention to provide a sheet-like material that can eliminate the above-mentioned drawbacks of the prior art. Moreover, this invention is providing the manufacturing method of the sheet-like thing which can eliminate the fault which such a prior art has.

The present invention will be described below based on preferred embodiments with reference to the drawings.
The sheet-like material of the present invention is used for absorbent articles. Absorbent articles are generally used for absorbing and holding excretory body fluids such as urine and menstrual blood. Absorbent articles include, for example, disposable diapers, sanitary napkins, incontinence pads, etc., but are not limited to these, and widely include articles used to absorb liquid discharged from the human body. It is.

The absorbent article typically includes a liquid-retaining absorbent, a top sheet disposed on the skin facing surface side of the absorbent body, and a back sheet disposed on the non-skin facing surface side of the absorber. And have. And this absorber has the sheet-like material of this invention, and the liquid-permeable core wrap sheet which coat | covers this sheet-like material. That is, the sheet-like material of the present invention is used for an absorbent article, for example, as an absorbent body covered with a liquid-permeable core wrap sheet. In the absorbent article, a so-called sublayer sheet may be disposed on at least one of the skin facing surface and the non-skin facing surface of the absorbent body.

As the top sheet, back sheet, and core wrap sheet, materials usually used in the technical field can be used without particular limitation. For example, as the surface sheet, liquid permeable sheets such as various nonwoven fabrics and perforated films subjected to a hydrophilic treatment can be used. As the back sheet, a liquid permeable or water repellent sheet such as a thermoplastic resin film or a laminate of the film and a nonwoven fabric can be used. The back sheet may have water vapor permeability. Further, as the core wrap sheet, a thin paper (tissue paper) manufactured by a wet papermaking method, a liquid-permeable nonwoven fabric, or the like can be used. Moreover, the said absorbent article may further comprise various members according to the specific use of this absorbent article. Such members are known to those skilled in the art. For example, when applying an absorbent article to a disposable diaper or a sanitary napkin, a pair or two or more pairs of leak-proof cuffs can be disposed on the left and right sides of the topsheet.

1 and 2 are sectional views schematically showing a sheet-like material 1 (hereinafter also simply referred to as “sheet-like material 1”) which is a preferred embodiment of the sheet-like material of the present invention. Yes. The sheet-like material 1 shown in FIG. 1 shows a state before the water-absorbing polymer particles absorb the liquid (hereinafter, also simply referred to as “state before use”). Also, the sheet-like material 1 shown in FIG. 2 shows a state in which the water-absorbing polymer particles have absorbed the liquid and swelled (hereinafter also simply referred to as “the state after swelling”). Here, the state after swelling means the state of particles of the water-absorbing polymer after the sheet-like material 1 is immersed for 60 minutes in a physiological saline (0.9% by mass sodium chloride aqueous solution) adjusted to 25 ° C. means. FIG. 3 shows a perspective view of the sheet-like object 1 in a state before use.

A sheet-like object 1 shown in FIG. 1 has a long direction having a horizontal direction (X direction), a vertical direction (Y direction) longer than the horizontal direction (X direction), and a thickness direction (Z direction). And an absorbent unit 4 comprising a water-absorbing polymer particle 3 (hereinafter also simply referred to as “water-absorbing polymer 3”) fixed to the surface of one surface of the long base portion 2 and the long base portion 2. A plurality of the absorptive units 4 are arranged such that the longitudinal direction (Y direction) faces at least one direction. Here, the horizontal direction (X direction), the vertical direction (Y direction), and the thickness direction (Z direction) of the elongated base portion 2 are the horizontal direction (X direction) and the vertical direction (Y direction) of the absorbent unit 4. ) And the thickness direction (Z direction). In this embodiment, the sheet material 1 also matches the horizontal direction (X direction), the vertical direction (Y direction), and the thickness direction (Z direction). (See FIG. 3). In addition, the longitudinal direction (Y direction) of the sheet-like object 1 corresponds with the wearer's front-back direction when the absorbent article provided with the sheet-like object 1 is worn.

1 is formed by arranging a plurality of absorbent units 4 such that the longitudinal direction (Y direction) of the absorbent unit 4 faces the longitudinal direction (Y direction) of the sheet 1. (See FIG. 3). From the viewpoint of ease of movement of the absorbent unit 4 between the

absorbent units

4 and 4 adjacent to each other in the lateral direction (X direction) of the long base portion 2 (absorbent unit 4), inclusions are not present. It exists. That is, the absorptive unit 4 is not wrapped with inclusions. In FIG.1 and FIG.2, the upper surface which is one surface of the elongate base | substrate part 2 is a skin opposing surface which opposes a wearer's skin, and the lower surface which is the other surface of the elongate base | substrate part 2 is a back surface It is a non-skin facing surface that faces the sheet. That is, the surface opposite to one surface is the other surface.

The absorbent unit 4 of the sheet-like material 1 is formed in a rectangular shape that is long in the longitudinal direction Y in a state before use. The absorptive unit 4 has a length Lx in the lateral direction X of preferably 0.5 mm to 10 mm, and more preferably 1 mm to 5 mm. The length Ly in the longitudinal direction Y of the absorbent unit 4 is preferably 20 times or more and 200 times or less, more preferably 40 times or more and 80 times or less with respect to the length Lx in the horizontal direction X. On the condition that this magnification is satisfied, the length Ly in the longitudinal direction Y of the absorbent unit 4 is preferably 10 mm or more and 500 mm or less, more preferably 200 mm or more and 400 mm or less. Thus, the absorptive unit 4 has an elongated shape.
In this embodiment patent, since the water-absorbing polymer particles 3 are fixed to the side edges of the long base portion, the length of the absorbent unit 4 in the lateral direction X with respect to the width W2 of the long base portion. The magnitude relationship of the length Lx is preferably 0 μm <(Lx−W2) <1400 μm, and more preferably 200 μm <(Lx−W2) <1000 μm.

In this embodiment, the sheet-like object 1 is formed in a rectangular shape that is long in the vertical direction (Y direction) in a state before use. The sheet-like material 1 has a length in the vertical direction (Y direction) of about 100 mm to 1000 mm, and a length in the horizontal direction (X direction) of about 50 mm to 300 mm.

The sheet-like object 1 has an absorption region AT in which a plurality of absorbent units 4 are arranged so as to face at least one direction before use. The ratio of the absorption region AT to the entire sheet-like material 1 is 20% from the viewpoint of easily absorbing the liquid in the region where the water-absorbing polymer particles 3 are fixed, in a plan view of the sheet-like material 1 before use. Preferably, it is 50% or more, more preferably 100% or less, still more preferably 90% or less, specifically 20% or more and 100% or less. It is preferable that it is 50% or more and 90% or less. Here, the ratio of the absorption area AT is 100%, for example, a plurality of sheet-like materials such that the longitudinal direction (Y direction) of the absorbent unit 4 faces the longitudinal direction (Y direction) of the sheet-like material 1. 1 in the case of juxtaposing in the lateral direction (X direction) means a form that is arranged in the entire region between both ends in the longitudinal direction (Y direction) of the sheet-like object 1 or of the absorbent unit 4 When juxtaposed in the longitudinal direction (Y direction) of the plurality of sheet-like objects 1 such that the longitudinal direction (Y direction) faces the lateral direction (X direction) of the sheet-like object 1, the longitudinal direction ( It means a form that is arranged over the entire region between both side portions along the (Y direction). Note that, when the sheet-like object 1 is viewed in plan, a region other than the absorption region AT becomes a non-slit region NT described later.

When arranging the absorbent unit 4 so that the longitudinal direction (Y direction) of the absorbent unit 4 faces the longitudinal direction (Y direction) of the sheet-like article 1, three or more absorbent units 4 are arranged per sheet-like article. Preferably, 50 or more are arranged, more preferably 1000 or less, more preferably 500 or less, more specifically, 3 or more. 1000 or less are preferably arranged, and more preferably 50 to 500 are arranged. Further, when the absorbent unit 4 is arranged so that the longitudinal direction (Y direction) of the absorbent unit 4 faces the lateral direction (X direction) of the sheet-like object 1, three or more absorbent units 4 are arranged per sheet-like object. Preferably 50 or more, more preferably 3500 or less, more preferably 2000 or less, specifically 3 The number is preferably 3 or more and 3500 or less, and more preferably 50 or more and 2000 or less. The counting method of the absorptive units 4 is defined as the number when the number of the absorptive units that intersect the straight line is maximized when a straight line in the lateral direction X is drawn.

The sheet-like object 1 before use is such that the longitudinal direction (Y direction) of the absorbent unit 4 is directed to the longitudinal direction (Y direction) of the sheet-like article 1 from the viewpoint of ease of conveyance during manufacture. It is preferable that a plurality of absorbent units 4 are arranged, and it is more preferable that the plurality of absorbent units 4 are arranged so as not to cross each other. In the sheet-like material 1 shown in FIG. 1, a plurality of absorbent units 4 each having a long base portion 2 having a uniform width are used, and the longitudinal direction (Y direction) of the absorbent unit 4 is the longitudinal direction of the sheet-like material 1. The sheet-like material 1 is formed in the longitudinal direction (Y direction) so as to face the direction (Y direction).

The sheet-like object 1 is a non-slit region in which a plurality of long base portions 2 are connected in the horizontal direction (X direction) on both ends in the vertical direction (Y direction) or on both sides along the vertical direction (Y direction). NT is preferably provided, and the sheet-like object 1 of the present embodiment includes non-slit regions NT at both ends in the vertical direction (Y direction) as shown in FIG. That is, in the sheet-like material 1 of the present embodiment, a single base sheet is provided, and non-slit regions NT are provided at both ends in the longitudinal direction (Y direction) of the base sheet, and the non-slit A plurality of elongated base portions 2 formed by a cutting process described later is provided between the regions NT. When such a non-slit region NT is provided, the sheet shape of the sheet-like object 1 is easily maintained in a state before use, and the structure is less likely to be disturbed. It is preferable that the water-absorbing polymer particles 3 are not arranged in the non-slit region NT. Thus, if the water-absorbing polymer particles 3 are not arranged in the non-slit region NT, even if the liquid is absorbed, the water-absorbing polymer particles 3 hardly swell in the non-slit region NT. However, the sheet shape of the sheet-like material 1 is easily maintained, the structure is hardly disturbed, the liquid is easily absorbed in the region where the water-absorbing polymer particles 3 are fixed, and the sheet-like material 1 as a whole is easily balanced. The effect of. In addition, when the sheet-like object 1 is provided with non-slit regions NT at both ends in the longitudinal direction (Y direction) as in the sheet-like object 1 shown in FIG. Are easily maintained, the structure is less likely to be disturbed, and the softness of the absorbent area AT is improved so that the wearer does not feel uncomfortable. Both ends in the longitudinal direction (Y direction) are fixed to the absorbent article. It is preferable.

In the sheet-like material 1 shown in FIG. 1, the ratio (W2 / W1) of the width (W2) (the length in the lateral direction (X direction)) of the long base portion 2 to the width (W1) of the sheet-like material 1 is From the viewpoint of the amount of the water-absorbing polymer particles 3 supported on the elongated base 2, swelling inhibition, flexibility, air permeability, maintenance of the sheet shape, etc., 0.001 or more is preferable. More preferably, it is preferably 0.200 or less, more preferably 0.040 or less, specifically, preferably 0.001 or more and 0.200 or less, More preferably, it is 0.002 or more and 0.040 or less.
Preferably, the width (W2) of the elongated base portion 2 is preferably 0.3 mm or more, more preferably 0.6 mm or more, and 10 mm or less from the same viewpoint. Is preferably 2.0 mm or less, more preferably 1.8 mm or less, specifically preferably 0.3 mm or more and 10 mm or less, and 0.6 mm or more and 2.0 mm or less. It is more preferable that it is 0.6 mm or more and 1.8 mm or less.
The width (W2) of the long base portion 2 is the distance between both side edges of the long base portion 2 along the longitudinal direction Y. The width (W1) of the sheet-like object 1 is a distance between both side edges of the sheet-like object 1 along the longitudinal direction Y.

The elongated base portion 2 (base material sheet) constituting the absorbent unit 4 is preferably a hydrophilic sheet from the viewpoint of improving the utilization efficiency of the water-absorbing polymer 3 because the liquid easily diffuses in the absorption region AT. . The hydrophilic sheet is defined as one having a contact angle of one constituent fiber of less than 90 °, or in the case of a sheet that is not a fiber material, having a surface contact angle of less than 90 °. In addition, the measuring method follows the following method. As the hydrophilic sheet, for example, a sheet-like material including a hydrophilic material can be used. Examples thereof include paper, non-woven fabric, cloth, synthetic sponge formed by foaming synthetic resin, etc. Among them, from the viewpoint of being relatively thin and having high tensile strength even when thin, it can be given flexibility. A nonwoven fabric is preferably used. These hydrophilic sheets can be used alone or in combination of two or more. As the non-woven fabric, a hydrophilic non-woven fabric containing hydrophilic fibers as constituent fibers, a hydrophilic non-woven fabric containing synthetic fibers imparted with hydrophilicity as constituent fibers, and the like are preferably used. The basis weight of the nonwoven fabric is preferably 5 g / m ² or more and 100 g / m ² or less, more preferably 10 g / m ² or more and 40 g / m ² or less. As the hydrophilic nonwoven fabric, those known in the technical field such as a spunbond nonwoven fabric, a melt blown nonwoven fabric, a spunlace nonwoven fabric, and an air-through nonwoven fabric can be used without particular limitation.

<Measurement method of hydrophilicity of long base part>
The contact angle of water with the constituent fibers of the sheet (hydrophilic sheet) forming the long base portion or the surface of the long base portion is measured by the following method. As a measuring device, an automatic contact angle meter MCA-J manufactured by Kyowa Interface Science Co., Ltd. is used. Distilled water is used for contact angle measurement. The amount of liquid ejected from an ink jet type water droplet ejection section (manufactured by Cluster Technology, Inc., pulse injector CTC-25 having a pore diameter of 25 μm) is set to 20 picoliters, and water droplets are dripped just above the constituent fibers. The state of dripping is recorded on a high-speed recording device connected to a horizontally installed camera. The recording device is preferably a personal computer incorporating a high-speed capture device from the viewpoint of image analysis or image analysis later. In this measurement, an image is recorded every 17 msec. In the recorded video, the first image of water droplets on the constituent fibers forming the non-skin facing surface or non-skin facing surface of the nonwoven fabric is the attached software FAMAS (software version is 2.6.2, analysis method is liquid Drop method and analysis method are θ / 2 method, image processing algorithm is non-reflective, image processing image mode is frame, threshold level is 200, and curvature correction is not performed). The angle formed between the surface touching and the constituent fiber is calculated as the contact angle.
In addition, when a long base part is a nonwoven fabric, the sample for a measurement (constituent fiber obtained by taking out from a nonwoven fabric) cuts the constituent fiber of a nonwoven fabric from the outermost layer by fiber length 1mm, and this constituent fiber is contact angle meter. The sample is placed on the sample stage and kept horizontal, and two different contact angles are measured for each constituent fiber. In each of the aforementioned parts, N = 5 contact angles are measured to one decimal place, and a value obtained by averaging a total of 10 measured values (rounded to the second decimal place) is defined as each contact angle.

As the water-absorbing polymer 3 fixed to one surface of the long base portion 2, various kinds of polymers conventionally used in the technical field of the absorbent article can be used. For example, polyacrylic acid soda, (Acrylic acid-vinyl alcohol) copolymer, crosslinked polyacrylic acid soda, (starch-acrylic acid) graft polymer, (isobutylene-maleic anhydride) copolymer and saponified product thereof, potassium polyacrylate, and poly Examples thereof include cesium acrylate, and one of these can be used alone or two or more of them can be used in combination. As the water-absorbing polymer particles 3, there are an irregular type, a block type, a bowl type, a spherical particle aggregation type, a spherical type, etc., due to the difference in shape. In 1, a spherical type is used.

As a method of fixing the water-absorbing polymer particles 3 on the surface of the long base portion 2, a method using an adhesive, a method of chemically fixing using hydrogen bonding, or the like, or a long base portion In the case where 2 is a nonwoven fabric or cloth, there are methods such as raising the constituent fibers and fixing them between the raised constituent fibers. In the sheet-like material 1 shown in FIGS. Is used. That is, the water-absorbing polymer particles 3 of the sheet-like material 1 are fixed to the surface of the elongated base portion 2 via the adhesive 5. In this way, when the water-absorbing polymer particles 3 are fixed to the surface of the long base portion 2 via the adhesive 5, the water-absorbing polymer is in a state before use or after swelling of the sheet-like material 1. Therefore, the adhesive 5 is preferably used.

As the adhesive 5, for example, a hot-melt adhesive is preferably used. Examples of the hot melt adhesive include styrene and olefin. Styrene-based hot melt adhesives include styrene-butadiene-styrene copolymer (SBS), styrene-isoprene-styrene copolymer (SIS), and styrene-ethylene-butylene-styrene copolymer that is a hydrogenated product of SBS. (SEBS) and blended hot-melt adhesives obtained by blending two or more of these can be used. Among these, from the viewpoint of easily balancing the tack force and the cohesive force, a blended hot-melt adhesive of SIS and SBS or a blended hot-melt adhesive of SIS and SEBS is preferably used. The application amount of the hot melt adhesive is preferably 0.5 g / m ² or more and 100 g / m ² or less, more preferably 5 g / m ² or more and 50 g / m ² or less.

In the sheet-like material 1 shown in FIG. 1, the water-absorbing polymer particles 3 are fixed to the surface of one surface (upper surface) of the long base portion 2 in a state before use (before swelling). It is fixed to the side edge 2s along the longitudinal direction (Y direction) of the scale-shaped base 2. Preferably, in the sheet-like object 1 of the present embodiment, as shown in FIG. 1, the adhesive 5 is applied from one side edge 2 s along the longitudinal direction (Y direction) of the long base 2 to one It has been applied to the other side edge 2s through the surface (upper surface). Therefore, in the sheet-like material 1 of the present embodiment, the water-absorbing polymer particles 3 are fixed to the side edge portions 2 s of the elongated base portion 2 via the adhesive 5, and the adhesive 5 The water-absorbing polymer particles 3 are also fixed to the surface of one surface (upper surface) of the elongate base portion 2 via the.

As shown in FIG. 1, in the sheet-like material 1 of the present embodiment, the water-absorbing polymer particles 3 are fixed to the side edge portion 2 s of the long base portion 2 in a state before use (before swelling). Therefore, when the water-absorbing polymer particles 3 fixed to the side edge 2s using the sheet 1 as an absorbent article absorb the liquid and swell, as shown in FIG. The position of the portion 2 tends to be different from the position before absorbing the liquid in the thickness direction (Z direction). Here, in the state after swelling of the sheet-like material 1, the position of the elongated base portion 2 is different from the position before absorbing the liquid in the thickness direction (Z direction). The position of the long base portion 2 in the state after swelling of the polymer particles 3 and the position of the long base portion 2 in the state before use (before swelling) of the water absorbent polymer particles 3 shown in FIG. It means that they are formed differently in the vertical direction. Specifically, there are cases where they are shifted vertically, when they are shifted diagonally, or when both are occurring.

The sheet-like material 1 is used for an absorbent article, and as shown in FIG. 2, the position of the water-absorbing polymer particles 3 in the elongated base portion 2 is before the liquid is absorbed in the thickness direction (Z direction). If it is likely to be different from the position, the side edges of the long base portion 2 between the adjacent

absorbent units

4 and 4 when the water absorbent polymer particles 3 absorb and swell the body fluid. Even if the 2s water-absorbing

polymer particles

3 and 3 are in contact with each other, the adjacent

absorptive units

4 and 4 can move freely in the thickness direction (Z direction), and the swollen water-absorbing

polymer particles

3 and 3 are in contact with each other. Can be reduced, the pressure applied to the swollen water-absorbing polymer particles 3 can be reduced, and the absorption of the body fluid of the water-absorbing polymer particles 3 is hardly inhibited. Therefore, in the sheet-like material 1 of the present embodiment, when the water-absorbing polymer particles 3 are swollen by absorbing the body fluid, the water-absorbing polymer particles 3 are unlikely to inhibit swelling, and the water-absorbing polymer particles 3 The absorption performance can be maximized, so the absorption performance is easy to improve. In particular, since the inclusion 1 is not present between the adjacent

absorbent units

4 and 4 in the sheet-like material 1 of the present embodiment, the absorbent unit 4 is easy to move, and the above effects can be more easily achieved. It has become.

Further, in the sheet-like material 1, in the state after swelling as shown in FIG. 2, the position of the elongated base portion 2 constituting the adjacent absorbent unit 4 is shifted up and down in the thickness direction (Z direction). It tends to be different, such as slanting. Therefore, the adjacent

absorbent units

4 and 4 are easy to move freely in the thickness direction (Z direction), the collision between the swollen water-absorbing

polymer particles

3 and 3 is easy to relax, and the swollen water-absorbing polymer particles 3 can be reduced, and it is difficult to inhibit the absorption of the body fluid of the water-absorbing polymer particles 3.

In addition, as shown in FIG. 1, the sheet-like material 1 of the present embodiment has a water-absorbing polymer particle 3 in the state of the long base portion 2 through an adhesive 5 before use (before swelling). It is fixed to the surface of one surface (upper surface) and both side edges 2s. In this way, the water-absorbing polymer particles 3 are fixed not only to the surface of one surface (upper surface) of the long base portion 2 but also to the side edges 2s. The amount has improved. Therefore, when the sheet-like material 1 is used for an absorbent article, the absorption capacity is improved.

The water-absorbing polymer particles 3 fixed on the surface of one surface (upper surface) of the long substrate portion 2 are in the state before the sheet-like material 1 shown in FIG. 1 is used (before swelling). It may exist inside the side edge 2 s of the part 2, or may be arranged near the side edge 2 s of the elongated base part 2. Like the water-absorbing polymer particles 3a in the state after swelling shown in FIG. 2, it is swollen beyond the side edge portion 2s of the elongated base portion 2, and the adjacent

absorbent units

4, 4 are in the thickness direction ( From the viewpoint of freely moving in the Z direction) and making it more difficult to inhibit the swelling of the water-absorbing polymer particles 3, it is preferably disposed in the vicinity of the side edge 2 s of the elongated base portion 2, for example, FIG. More preferably, the water-absorbing polymer particles 3b before use (before swelling) are present beyond the side edge 2s of the elongated substrate 2 from the beginning. Here, the water-absorbing polymer particle 3 exceeds the side edge 2s of the elongated base portion 2, in other words, for example, the water-absorbing polymer particle 3b shown in FIG. 1 or the swollen water absorption shown in FIG. It means that the water-absorbing polymer particles 3 are present across the side edge 2s of the elongated base portion 2 like the conductive polymer particles 3a.

Further, in the sheet-like material 1, from the viewpoint of making the adjacent

absorbent units

4 and 4 freely move in the thickness direction (Z direction) and making the swelling inhibition of the water-absorbing polymer particles 3 more difficult to occur, the long substrate The distance between the side edges 2s, 2s along the longitudinal direction (Y direction) of the portion 2 is larger than the average particle diameter of the water-absorbing polymer particles 3 before use (before swelling), The average particle diameter of the water-absorbing polymer particles 3 is preferably smaller. The distance between the side edges 2s, 2s of the long base portion 2 has the same meaning as the width (W2) of the long base portion 2 described above. The average particle diameter of the water-absorbing polymer particles 3 before use (before swelling) is preferably 20 μm or more, more preferably 200 μm or more, and preferably 700 μm or less, 500 μm or less. More specifically, it is preferably 20 μm or more and 700 μm or less, and more preferably 200 μm or more and 500 μm or less. On the other hand, the average particle size of the water-absorbing polymer particles 3 in the swollen state is preferably 200 μm or more, more preferably 800 μm or more, and preferably 3000 μm or less, and 2000 μm or less. More preferably, it is preferably 200 μm or more and 3000 μm or less, and more preferably 800 μm or more and 2000 μm or less. The average particle diameter of the water-absorbing polymer particles 3 is determined by the following measuring method.

<Measuring method of average particle diameter d1 of water-absorbing polymer particles before use>
The average particle diameter d1 in the state before use was determined by observing the diameter or major axis of the water-absorbing polymer particles with an optical microscope using the water-absorbing polymer particles before use. Here, the diameter refers to the case where the water-absorbing polymer particles are spherical. The long axis refers to a case in which the water-absorbing polymer particles have an irregular shape such as a rhombus, rectangle, tuft, or football. The diameter or major axis of a total of 50 water-absorbing polymer particles is measured, and the number average particle diameter is defined as the average particle diameter of the water-absorbing polymer particles in a state before use.

<Measuring method of average particle diameter d2 of water-absorbing polymer particles after swelling>
The average particle diameter d2 in the swollen state is such that the sheet 1 is immersed in a physiological saline (0.9 mass% sodium chloride aqueous solution) adjusted to 25 ° C., and the sheet 1 is 1 hour after the start of the immersion. Is taken out from the physiological saline, suspended in a vertical state for 30 minutes and drained, and then the diameter or major axis of the water-absorbing polymer particles on the surface of the elongated substrate portion 2 can be measured with an optical microscope. The diameter here refers to the case where the water-absorbing polymer particles are spherical. The long axis refers to a case in which the water-absorbing polymer particles have an irregular shape such as a rhombus, rectangle, tuft, or football. The diameter or major axis of a total of 50 water-absorbing polymer particles is measured, and the number average particle diameter is defined as the average particle diameter of the water-absorbing polymer particles in the swollen state.

Next, a preferred embodiment of the method for producing a sheet-like material of the present invention will be described with reference to FIG. 4 by taking as an example the case of producing the sheet-like material 1 having the above-described configuration. FIG. 4 shows a manufacturing apparatus 100 that is preferably used in the manufacturing method of this embodiment. The manufacturing apparatus 100 of this embodiment includes a base sheet cut part 110, a widening part 170, an adhesive application part 120, and a water-absorbing polymer spraying part 130 in this order from the upstream side to the downstream side of the manufacturing process. ing. In the manufacturing apparatus 100 shown in FIG. 4, an apparatus in which the adhesive application unit 120 and the water absorbent polymer spraying unit 130 are integrated is used. However, the adhesive application unit 120 and the water absorbent polymer spraying unit 130 are integrated. It does not have to be. The integrated device has a configuration in which an adhesive application unit 120 is disposed on the upstream side of the device, and a water-absorbing polymer spraying unit 130 is disposed on the downstream side of the integrated device.

The base sheet cut part 110 is a part that cuts the strip-shaped base sheet 20 that is a raw material of the long base part 2 to form a plurality of long base parts 2. Various known cutting devices can be used for cutting the base sheet 20 without any particular limitation. However, in the manufacturing device 100, as shown in FIG. 5, a plurality of

cutter blades

111a, 111a, 111a,. A cutting device 113 including a rotary die 111b in which a... Is disposed and a receiving roll 112 having a flat peripheral surface disposed opposite to the rotary die 111b is used. The cutter blades 111a of the cutting device 113 are arranged in the rotation direction of the rotary die 111b, and the plurality of

cutter blades

111a, 111a, 111a,. ) Are arranged side by side in a direction orthogonal to (X1 direction). The interval between the

cutter blades

111a, 111a adjacent to each other in the orthogonal direction (X1 direction) corresponds to the width (length in the horizontal direction (X direction)) of each long base portion 2 to be formed. Here, the conveyance direction (Y1 direction) of the base sheet 20 corresponds to the longitudinal direction (Y direction) of the sheet-like material 1 to be manufactured, and the orthogonal direction (X1 direction) is the sheet shape to be manufactured. This corresponds to the horizontal direction (X direction) of the object 1. The base sheet 20 may be cut using a shear-cut type cutting device that rubs and cuts the side surfaces of the upper blade and the lower blade, and a plurality of score cut knives are orthogonally crossed (X1 direction). A juxtaposed apparatus may be used, or a laser apparatus that melts by irradiation with laser light may be used.

When the sheet-like object 1 includes the non-slit regions NT at both ends in the longitudinal direction (Y direction) like the sheet-like object 1 shown in FIG. 3, for example, as shown in FIG. The recess 114 may be formed on the peripheral surface of the cutter blade 111a. The length of the arc of the concave portion 114 at the outer periphery of the rotating cutter blade 111a is the sum of the lengths in the vertical direction (Y direction) of the non-slit regions NT arranged at both ends of the sheet-like object 1 shown in FIG. Try to accommodate equal lengths. If a plurality of

cutter blades

111a, 111a, 111a... Having such a recess 114 are prepared and a rotary die 111b is used in which the positions of the

recesses

114, 114 of the cutter blades 111a adjacent to each other in the X1 direction are aligned. Good. Note that the length of the arc of the portion excluding the recess 114 on the outer periphery of the rotating cutter blade 111a corresponds to the length in the longitudinal direction (Y direction) of the long base portion 2 of the sheet-like object 1 shown in FIG. is doing. Moreover, when the sheet-like object 1 is provided with the non-slit area | region NT in the both sides along a vertical direction (Y direction), if it is made not to distribute the cutter blade 111a in the position corresponding to this non-slit area | region NT. Good.

The widened portion 170 located on the downstream side of the base sheet cut portion 110 is a portion that widens the interval between the

elongated base portions

2 and 2 adjacent in the X1 direction. Various known widening devices can be used for widening between the

long base portions

2 and 2 without particular limitation. For example, as a known widening device, an arcuate curved roll such as a crown roll or an expander roll can be cited. The manufacturing apparatus 100 includes a crown roll 171 as shown in FIG. The crown roll 171 is formed to have a length corresponding to the width (the length in the lateral direction (X direction)) of the absorption region AT of the sheet-like object 1 in the X1 direction, as shown in FIG. In addition, it has a circumferential surface that curves outward.

The adhesive application part 120 located on the downstream side of the widened part 170 is a part where the adhesive 5 is applied from the surface side of one surface (upper surface) of the elongated base body part 2. As shown in FIG. 4, an application head 121 is provided. For the coating head 121, various known coating devices can be used without particular limitation. The coating head 121 is formed to have a length corresponding to the width (the length in the horizontal direction (X direction)) of the absorption region AT of the sheet-like object 1 in the X1 direction. The coating head 121 formed in this way is arranged on one surface (upper surface) of the long base portion 2.

The water-absorbing polymer spraying unit 130 located on the downstream side of the adhesive application unit 120 sprays the water-absorbing polymer particles 3 on the surface of one surface (upper surface) of the elongated base body 2 to dispose the absorbent unit 4. As shown in FIG. 4, the manufacturing apparatus 100 includes a water-absorbing polymer introduction part 131. For the water-absorbing polymer introduction part 131, various known introduction devices can be used without particular limitation. The water-absorbing polymer introduction part 131 is formed to have a length corresponding to the width (the length in the horizontal direction (X direction)) of the absorption region AT of the sheet-like material 1 in the X1 direction. The water-absorbing polymer introduction part 131 formed in this way is arranged on one surface (upper surface) of the long base part 2.

Moreover, in the manufacturing apparatus 100 shown in FIG. 4, it is a position which opposes the apparatus with which the adhesive application part 120 and the water-absorbing polymer dispersion | distribution part 130 were integrated, Comprising: Of the several elongate base | substrate part 2 conveyed, A vacuum conveyor 141 is disposed on the lower surface side. The vacuum conveyor 141 includes an endless breathable belt 144 laid across a drive roll 142 and a plurality of driven rolls 143, and a vacuum box disposed at a position facing the integrated device with the breathable belt 144 interposed therebetween. 145. On the vacuum conveyor 141, a plurality of long base portions 2 in which the interval between the

long base portions

2 and 2 adjacent in the X1 direction is widened are introduced by the widening portion 170. Yes.

Moreover, in the manufacturing apparatus 100 shown in FIG. 4, the drive roll 151 which pays out the base material sheet 20 from the raw fabric roll of the strip | belt-shaped base material sheet 20, and the precursor 1b of the manufactured sheet-like thing 1b most downstream. And a drive roll 152 for conveying the above.

Next, an embodiment of a method for continuously manufacturing the sheet-like material 1 using the manufacturing apparatus 100 of the above-described embodiment, that is, a method for manufacturing the sheet-like material of the present invention will be described.
The manufacturing method of the sheet-like object 1 of the present embodiment includes a cutting step of cutting the strip-shaped base sheet 20 to form a plurality of long base portions 2, and a plurality of pieces formed in the cutting step. A widening step of widening the long base portion 2 using the widening portion 170 to widen the interval between the adjacent

long base portions

2 and 2, and the

long base portions

2 and 2 adjacent in the widening step. A step of spraying water-absorbing polymer particles 3 on a plurality of elongated base portions 2 having a wide interval. Moreover, in this embodiment, the adhesive application process which apply | coats the adhesive agent 5 is provided in the process before the particle | grain dispersion | distribution process of the particle | grains of a water absorbing polymer. That is, the manufacturing method of the sheet-like material 1 of the present embodiment includes a widening process in the subsequent process of the cutting process, an adhesive application process in the subsequent process of the widening process, and a water-absorbing polymer in the subsequent process of the adhesive coating process. The particle dispersion process of the particle | grains is provided.

Prior to carrying out the cutting step, first, the vacuum box 145 is made negative by operating the exhaust device connected thereto.

Next, the drive roll 151 and the drive roll 152 are driven, the cutting device 113 and the breathable belt 144 are rotated, and the vacuum conveyor 141 is operated. Then, the base sheet 20 is fed out from the raw roll of the strip-shaped base sheet 20 by the driving roll 151 and supplied between the plurality of cutter blades 111a and the receiving roll 112 in the cutting device 113 of the base sheet cut section 110. Then, the strip-shaped base sheet 20 is cut to form a plurality of long base portions 2 (cutting step). In the present embodiment, as shown in FIG. 5, the plurality of cutter blades 111 a arranged in the rotation direction of the rotary die 111 b are respectively orthogonal to the conveyance direction (Y1 direction) of the belt-shaped base sheet 20 ( X1 direction) are arranged side by side, so the strip-shaped base sheet 20 is cut along the transport direction (Y1 direction) of the base sheet 20 and cut at a plurality of locations in the orthogonal direction (X1 direction). Thus, a plurality of long base portions 2 are formed. Further, the portion cut by the cutter blade 111 a becomes the side edge portion 2 s of the long base portion 2.

Moreover, in this embodiment, since the some cutter blade 111a has the recessed part 114, respectively, the longitudinal direction (Y direction) of the elongate base | substrate part 2 is conveyed to the strip | belt-shaped base material sheet 20 conveyed. The non-cut portion NTb corresponding to twice the length in the longitudinal direction (Y direction) of the non-slit region NT is intermittently formed. The plurality of long base portions 2 formed in the cutting step are formed in parallel to the transport direction (Y1 direction) and are arranged in parallel in the orthogonal direction (X1 direction).

Next, a plurality of long base portions 2 formed in the cutting step are widened with the widening portion 170 to widen the interval between the adjacent long base portions 2 and 2 (widening step). In this embodiment, as shown in FIG. 6, a plurality of long base portions 2 juxtaposed in the orthogonal direction (X1 direction) are conveyed onto the peripheral surface of the crown roll 171, The distance between the

elongated base portions

2 and 2 adjacent to each other in the X1 direction is increased while passing through the peripheral surface.

Next, the adhesive 5 is applied from one surface (upper surface) of the plurality of long base portions 2 in which the distance between the adjacent

long base portions

2 and 2 formed in the widening step is widened ( Adhesive application process). In the present embodiment, a vacuum box is used while conveying a plurality of elongated base portions 2 in which the interval between the

elongated base portions

2 and 2 adjacent to each other in the X1 direction is widened by the vacuum conveyor 141 in the widening step. 145 on one surface (upper surface) of the plurality of long base portions 2 formed side by side in the orthogonal direction (X1 direction) by the application head 121 of the adhesive application unit 120 while being positioned on the upper surface 145. Then, the adhesive 5 is applied intermittently except for the non-cut portion NTb. Then, the adhesive 5 is applied on one surface (upper surface) of the long base portion 2 in which the distance between the

long base portions

2 and 2 adjacent to each other in the X1 direction is widened. The adhesive 5 is applied to the surface of one surface (upper surface) of the portion 2 and the side edge portion 2s.

Next, water-absorbing polymer particles 3 are dispersed on the adhesive 5 applied from one surface (upper surface) of the plurality of long base portions 2 formed in the adhesive application step (water absorption). Particle dispersion process of polymer particles). In the present embodiment, while the long base portion 2 having the adhesive 5 applied to the surface of one surface (upper surface) and the side edge portion 2 s formed in the adhesive application step is conveyed by the vacuum conveyor 141. A plurality of the elongated base portions 2 arranged side by side with an interval in the orthogonal direction (X1 direction) by the water absorbent polymer introduction portion 131 of the water absorbent polymer spraying portion 130 while being positioned on the vacuum box 145. The water-absorbing polymer particles 3 are dispersed on the surface of one surface (upper surface) and the adhesive 5 applied to the side edge portion 2s except for the non-cut portion NTb. By spraying the water-absorbing polymer particles 3 in this manner, the water-absorbing polymer particles 3 are fixed to the side edge portion 2s of the long base portion 2 and the surface of one surface (upper surface) via the adhesive 5. A plurality of the absorbent units 4 thus formed are formed. The plurality of absorbent units 4 formed in this way are arranged so that the respective longitudinal directions (Y direction) face the transport direction (Y1 direction), and form the precursor 1b of the sheet-like material 1 To come.

Next, the precursor 1b of the sheet-like material 1 is conveyed downstream by the drive roll 152, and the length of the non-cut portion NTb in the conveying direction (Y1 direction) is secondarily determined using a known cutting device (not shown). It cut | disconnects for every position of a minute, and the sheet-like article 1 which has the non-slit area | region NT in the both ends of a vertical direction (Y direction) is manufactured continuously. Thus, according to the manufacturing apparatus 100 of this embodiment and the manufacturing method of this embodiment using the same, the sheet-like object 1 can be manufactured stably and efficiently.

The present invention is not limited to the above embodiment and the above embodiment, and can be modified as appropriate.
In the sheet-like material 1 shown in FIG. 1 described above, the water-absorbing polymer particles 3 are fixed to the surface of one surface (upper surface) of each long base portion 2. From the viewpoint of improving the absorption performance, each of the long base portions 2 may be fixed not only to the surface of one surface (upper surface) but also to the surface of the other surface (lower surface). In order to fix the water-absorbing polymer particles 3 on both surfaces (upper and lower surfaces) of each long base portion 2, for example, one surface of each long base portion 2 is used by using the manufacturing apparatus 100 shown in FIG. After fixing the water-absorbing polymer particles 3 to the surface of the (upper surface) and the side edge portion 2s, the water-absorbing polymer particles 3 are reversed through a reversing roll, and then each of the long base portions is separated using another water-absorbing polymer spraying portion 130. 2 can be produced by dispersing and fixing water-absorbing polymer particles 3 on the surface of the other surface (lower surface).

When the water-absorbing polymer particles 3 are fixed to both surfaces (upper and lower surfaces) of each elongated substrate portion 2, the surface of the other surface (lower surface) of the elongated substrate portion 2 from the viewpoint of further achieving the above effect. It is preferable that the basis weight of the water-absorbing polymer 3 fixed to is larger than the basis weight of the water-absorbing polymer 3 fixed to the surface of one surface (upper surface) of the elongated base portion 2. The basis weight of the water-absorbing polymer 3 to be fixed to the surface of one surface (upper surface) of the long base portion 2 is preferably 10 g / m ² or more and 250 g / m ² or less, and 30 g / m ² or more and 150 g / m ^2. More preferably, it is m ² or less. The basis weight of the water-absorbing polymer 3 to be fixed to the surface of the other surface (lower surface) of the elongated base portion 2 is preferably 30 g / m ² or more and 400 g / m ² or less, and 50 g / m ² or more and 300 g / m ^2. More preferably, it is m ² or less.
The basis weight of the water-absorbing polymer 3 fixed to one surface (upper surface) side of the long base portion 2 and the water-absorbing polymer 3 fixed to the other surface (lower surface) side of the long base portion 2. The basis weight of is measured by the following method.

<The basis weight of the water-absorbing polymer 3 fixed to one surface (upper surface) side of the long base portion 2 and the water-absorbing polymer fixed to the other surface (lower surface) side of the long base portion 2 Measuring method of basis weight of 3>
The water-absorbing polymer on the other surface (lower surface) side of the long base portion 2 is fixed again from the upper surface of the water-absorbing polymer with an adhesive or the like so that it does not fall off, and is fixed to one surface (upper surface) side. The water-absorbing polymer is peeled from the elongated base portion 2 using a solvent or the like, and the adhesive adhering to the water-absorbing polymer is washed. After drying the water-absorbing polymer, the weight of the water-absorbing polymer fixed on one surface (upper surface) side is measured, and the area of the long base portion 2 where the water-absorbing polymer is fixed and peeling are removed. The weight of the water-absorbing polymer fixed per unit area is calculated from the weight of the water-absorbing polymer, and the basis weight of the water-absorbing polymer on one surface (upper surface) side is calculated. Five measurements are taken and the average value is calculated.
Regarding the basis weight of the water-absorbing polymer on the other surface (lower surface) side, similarly, after fixing the water-absorbing polymer on one surface (upper surface) side, the water-absorbing polymer on the other surface (lower surface) side is peeled off and washed. And calculate.

In addition, when fixing the water-absorbing polymer particles 3 on both surfaces (upper and lower surfaces) of each elongated base portion 2, a large amount of liquid is held on the non-skin facing surface (lower surface) far from the wearer's skin, From the viewpoint of improving the touch without leaving a liquid on the skin-facing surface (upper surface), the water-absorbing polymer 3 fixed to the surface of one surface (upper surface) of the elongate base portion 2 is the long base. Compared to the water-absorbing polymer 3 fixed to the surface of the other surface (lower surface) of the part 2, it is preferable that the liquid passing performance under pressure is high and the centrifugal retention amount is low. From the above viewpoint, with respect to the water-absorbing polymer 3 fixed to the surface of one surface (upper surface) of the long base portion 2, the liquid passing rate under pressure at 2.0 kPa is preferably 20 ml / min or more. 40 ml / min or more, more preferably 1000 ml / min or less, further preferably 800 ml / min or less, specifically 20 ml / min or more and 1000 ml / min or less. It is preferably 40 ml / min or more and 800 ml / min or less. In addition, with respect to the water-absorbing polymer 3 fixed to the surface of the other surface (lower surface) of the long base portion 2, the liquid flow rate under pressure at 2.0 kPa is preferably 0 ml / min or more, preferably 10 ml. / Min or more, more preferably 400 ml / min or less, further preferably 200 ml / min or less, and specifically 0 ml / min or more and 400 ml / min or less. It is preferably 10 ml / min or more and 200 ml / min or less. The liquid passing speed under pressure is determined by the following measuring method.

<Measurement method of liquid flow rate under pressure>
The liquid passing speed under pressure is measured using a measuring method and measuring apparatus described in JP-A No. 2003-235889. That is, in a 100 mL glass beaker, a sufficient amount of physiological saline (0.9% by mass sodium chloride aqueous solution) to swell the measurement sample water-absorbing polymer 0.32 ± 0.005 g, for example, saturation of the water-absorbing polymer. Immerse in physiological saline more than 5 times the amount of absorption and leave for 30 minutes. Separately, at the lower end of an opening of a vertically standing cylinder (inner diameter 25.4 mm), a wire mesh (mesh opening 150 μm, biocolumn sintered stainless steel filter 30SUS sold by Sansho Co., Ltd.) and a capillary (with an inner diameter of 2 mm) ( A filtration cylindrical tube having an inner diameter of 4 mm and a length of 8 cm) is prepared, and the contents of the beaker including the swollen measurement sample are put into the cylindrical tube with the cock closed. Next, a cylindrical rod having a diameter of 2 mm with a wire mesh having an opening of 150 μm and a diameter of 25 mm is inserted into the filtration cylindrical tube so that the wire mesh and the measurement sample are in contact with each other. Put a weight so that the load of. After standing for 1 minute in this state, the cock is opened to flow the liquid, and the time until the liquid level in the filtration cylindrical tube reaches the 40 mL scale line from the 60 mL scale line (that is, 20 mL of liquid passes) (T1). (Seconds) is measured. Using the measured time T1 (seconds), the liquid flow rate under pressure at 2.0 kPa is calculated from the following equation. In the formula, T0 (seconds) is a value obtained by measuring the time required for 20 ml of physiological saline to pass through the wire mesh without putting a measurement sample in the filtration cylindrical tube.
Flow rate under pressure (ml / min) = 20 × 60 / (T1-T0)
The measurement is performed 5 times (n = 5), the values at each of the upper and lower points are deleted, and the average value of the remaining three points is taken as the measured value. Further, the measurement is performed at 23 ± 2 ° C. and humidity 50 ± 5%, and the sample is measured after being stored in the same environment for 24 hours or more. A more detailed method for measuring the liquid flow rate under pressure is described in paragraphs [0008] and [0009] of Japanese Patent Application Laid-Open No. 2003-235889, and the measuring apparatus is shown in FIGS. Are listed.

From the above viewpoint, with respect to the water-absorbing polymer 3 fixed to the surface of one surface (upper surface) of the elongated base portion 2, the centrifugal retention amount (water absorption amount) is preferably 20 g / g or more, and 25 g / G or more, more preferably 50 g / g or less, even more preferably 45 g / g or less, and specifically 20 g / g or more and 50 g / g or less. Preferably, it is more preferably 25 g / g or more and 45 g / g or less. Further, regarding the water-absorbing polymer 3 fixed to the surface of the other surface (lower surface) of the elongated base portion 2, the centrifugal retention amount (water absorption amount) is preferably 25 g / g or more, and 30 g / g. More preferably, it is preferably 65 g / g or less, more preferably 55 g / g or less, specifically 25 g / g or more and 65 g / g or less, More preferably, it is 30 g / g or more and 55 g / g or less. The centrifugal retention amount (water absorption amount) is determined by the following measurement method.

<Measuring method of centrifugal retention (water absorption)>
The centrifugal retention amount (water absorption amount) is measured according to JIS K 7223 (1996). Nylon woven fabric (sold by Sanriki Seisakusho, product name: nylon net, standard: 250 mesh) is cut into a rectangle with a width of 10 cm and a length of 40 cm, folded in half at the center in the longitudinal direction, and heat sealed at both ends to a width of 10 cm A nylon bag having an inner dimension of 9 cm and a length of 20 cm is prepared. Next, 1.00 g of the water-absorbing polymer as a measurement sample is precisely weighed and placed uniformly at the bottom of the produced nylon bag. Next, the nylon bag containing the sample is immersed in physiological saline (0.9 mass% sodium chloride aqueous solution) adjusted to 25 ° C. After 1 hour from the start of immersion, the nylon bag is taken out from the physiological saline, suspended in a vertical state for 1 hour and drained, and then dehydrated using a centrifugal dehydrator (model H-130C special model manufactured by Kokusan Co., Ltd.). The dehydration condition is 143 G (800 rpm) for 10 minutes. After dehydration, the mass of the sample is measured, and the target centrifugal retention amount (water absorption amount) is calculated according to the following formula.
Centrifugal retention amount (g / g) = (a′−bc) / c
In the formula, a ′ is the total mass (g) of the sample and nylon bag after centrifugal dehydration, b is the mass (g) of the nylon bag before water absorption (during drying), and c is the mass of the sample before water absorption (during drying). (G) is represented.
The measurement is performed 5 times (n = 5), the values at each of the upper and lower points are deleted, and the average value of the remaining three points is taken as the measured value. Further, the measurement is performed at 23 ± 2 ° C. and humidity 50 ± 5%, and the sample is measured after being stored in the same environment for 24 hours or more.

Moreover, although the sheet-like material 1 shown in FIG. 1 described above is formed by using a plurality of absorbent units 4 each having a long base portion 2 having a uniform width, the width of the long base portion 2 is as follows. It may be non-uniform. Preferably, when the sheet-like material 1 is viewed in plan, the water-absorbing polymer particles 3 are unevenly distributed and fixed, and in a portion where the basis weight of the fixed water-absorbing polymer 3 is relatively large, The distance between the

side edge portions

2s and 2s along the longitudinal direction (Y direction) of the base portion 2 may be relatively short. That is, comparing the portion with a large basis weight of the fixed water-absorbing polymer 3 with a portion with a small basis weight, the portion between the side edges 2s, 2s of the long base portion 2 in the portion with a large basis weight of the fixed water-absorbing polymer 3 This distance may be shorter than the distance between the side edges 2s, 2s of the long base portion 2 in the portion where the basis weight of the fixed water-absorbing polymer 3 is small. In the case of the sheet-like material 1 having the above-described configuration, adjacent

absorbent units

4 and 4 are easily movable in the thickness direction (Z direction) in a portion where the basis weight of the fixed water-absorbing polymer 3 is large, Since the sheet-like material 1 is hard to become hard and the absorption performance of the water-absorbing polymer particles 3 can be maximized, the absorption performance of the sheet-like material 1 is easily improved.

Further, the sheet-like object 1 shown in FIG. 3 described above is formed by arranging so that the longitudinal direction (Y direction) of each of the plurality of absorbent units 4 faces the longitudinal direction (Y direction) of the sheet-like object 1. However, as shown in FIG. 7, for example, the plurality of absorbent units 4 are arranged so that the longitudinal direction (Y direction) faces the lateral direction (X direction) of the sheet 1. Also good. In addition, the sheet-like object 1 shown in FIG. 7 is provided with the non-slit area | region NT in the both sides along a vertical direction (Y direction). When manufacturing the sheet-like object 1 shown in FIG. 7, a rotary die in which cutter blades arranged parallel to the axial direction of the roll are intermittently arranged in the circumferential direction and a receiving roll are used. It can form by supplying the base material sheet 20 between this and this receiving roll.

Alternatively, the sheet-like object 1 may be formed by arranging the absorbent units 4 such that the longitudinal direction (Y direction) faces a plurality of directions. As the sheet-like material 1 formed so as to face the plurality of directions, for example, the longitudinal direction (Y direction) of each of the plurality of absorbent units 4 is the longitudinal direction (Y direction) of the sheet-like material 1. There are regions formed so as to face each other on both sides along the longitudinal direction (Y direction) of the sheet-like material 1, and the longitudinal direction (Y direction) of each of the plurality of absorbent units 4 is a sheet shape. The form etc. which have the area | region formed by arranging so that it may face the horizontal direction (X direction) of the thing 1 in the center part pinched | interposed by the said both sides are mentioned. The sheet-like object 1 formed so as to be oriented in such a plurality of directions, for example, using a plurality of cutter blades 111a and receiving rolls 112, the conveyance direction (Y1 direction) of the substrate sheet 20 that is conveyed. ) Are cut at a plurality of positions on both sides, and then the central portion in the orthogonal direction (X1 direction) of the substrate sheet 20 to be conveyed using a cut roll and a receiving roll intermittently arranged in the circumferential direction. Can be formed by cutting a plurality of locations.

Further, in the sheet-like material 1 shown in FIG. 1 described above, each absorbent unit 4 and each long base portion 2 extend linearly in a substantially parallel manner in the vertical direction (Y direction). It only needs to extend in the vertical direction (Y direction). For example, each absorptive unit 4 and each long base part 2 may extend by repeating an S shape in the vertical direction (Y direction), or may extend in a jagged shape in the vertical direction (Y direction). Good.

Moreover, in the manufacturing method of the sheet-like article 1 of the present embodiment described above, an adhesive application process is provided in the post-process of the cutting process, and a water-absorbing polymer spraying process is provided in the post-process of the adhesive application process. When raising the surface of one surface of the base material sheet 20, a raising process may be provided instead of the adhesive application process. What is necessary is just to prepare such a raising process process in the front process of a cutting process. Examples of the raising method include a method described in JP2012-092476A, a method described in JP2013-028891A, and the like.

The following sheet-like material is further disclosed regarding the embodiment described above.

<1>
A long base portion having a horizontal direction, a longitudinal direction longer than the horizontal direction, and a thickness direction, and particles of a water-absorbing polymer fixed to the surface of one surface of the long base portion A plurality of absorptive units, each of the absorptive units being arranged so that its longitudinal direction faces at least one direction,
Before the water-absorbing polymer particles absorb the liquid, the water-absorbing polymer particles are fixed to the surface of the one surface of the elongate base portion, and the longitudinal direction of the elongate base portion A sheet-like object that is fixed to the side edge along the line.

<2>
The sheet-like material includes a non-slit region in which a plurality of the elongated base portions are connected in the lateral direction at both ends in the vertical direction, and the water-absorbing polymer particles are present in the non-slit region. The sheet-like material according to <1>, which is not arranged.
<3>
The sheet-like material according to <1> or <2>, wherein both end portions in the longitudinal direction are fixed to the absorbent article.
<4>
When the sheet-like material is viewed in plan, the water-absorbing polymer particles are unevenly distributed and fixed, and in the portion where the basis weight of the fixed water-absorbing polymer is relatively large, The sheet-like material according to any one of <1> to <3>, wherein a distance between both side edges along the vertical direction is relatively short.
<5>
Before the water-absorbing polymer particles absorb the liquid, the water-absorbing polymer particles are fixed to the surface of the other surface of the elongated base portion, according to any one of <1> to <4> The sheet-like material according to 1.

<6>
The sheet-like material according to any one of <1> to <5>, wherein no inclusion is present between the absorbent units adjacent in the lateral direction of the elongated base portion.
<7>
The sheet-like material according to any one of <1> to <6>, wherein the absorbent unit is not wrapped with inclusions.
<8>
The absorbent unit is formed in a rectangular shape that is long in the vertical direction,
The sheet-like material according to any one of <1> to <7>, wherein the absorbent unit has a lateral length Lx of 0.5 mm to 10 mm, preferably 1 mm to 5 mm.
<9>
The longitudinal length Ly of the absorbent unit is 20 times or more and 200 times or less, preferably 40 times or more and 80 times or less of the lateral length Lx. The sheet-like material according to any one of the above.
<10>
The sheet-like material according to any one of <1> to <9>, wherein the longitudinal length Ly of the absorbent unit is 10 mm to 500 mm, preferably 200 mm to 400 mm.
<11>
The size relationship of the lateral length Lx of the absorbent unit with respect to the width W2 of the elongated base portion is 0 mm <(Lx−W2) <1.4 mm, preferably 0.2 mm <( Lx-W2) The sheet-like material according to any one of <1> to <10>, wherein <1.0 mm.

<12>
The sheet-like material is formed in a rectangular shape that is long in the vertical direction in a state before use,
The sheet-like material according to any one of <1> to <11>, wherein the length in the vertical direction is from 100 mm to 1000 mm, and the length in the horizontal direction is from 50 mm to 300 mm. object.
<13>
The sheet-like material has an absorption region in which a plurality of the absorptive units are arranged so as to face at least one direction in a state before use,
In plan view of the sheet-like material before use, the ratio of the absorption region to the entire sheet-like material is 20% or more, preferably 50% or more, and 100% or less, preferably 90% or less. The sheet-like material according to any one of the above items <1> to <12>.
<14>
The absorptive unit is arranged such that its longitudinal direction faces the longitudinal direction of the sheet-like material,
3 or more, preferably 50 or more, and 1000 or less, preferably 500 or less of the absorbent units are arranged per sheet-like material. <1> to <13 > Any one of>.
<15>
The absorptive unit is arranged such that its longitudinal direction faces the lateral direction of the sheet-like object,
3 or more, preferably 50 or more, and 3500 or less, preferably 2000 or less of the absorbent units are arranged per sheet-like material. <1> to <13 > Any one of>.
<16>
A plurality of the sheet-like objects in a state before use are arranged so that the longitudinal direction of the absorbent unit is oriented in the longitudinal direction of the sheet-like article, and the plurality of absorbent units do not cross each other. The sheet-like material according to any one of <1> to <14>, which is arranged.

<17>
The sheet-like object includes a non-slit region where a plurality of the elongated base portions are connected in the lateral direction at both ends in the longitudinal direction,
When the sheet-like material is used for an absorbent article, the sheet according to any one of <1> to <16>, wherein both end portions in the longitudinal direction of the sheet-like material are fixed to the absorbent article. State.
<18>
The ratio of the width W2 of the elongated base portion to the width W1 of the sheet-like material is 0.001 or more, preferably 0.002 or more, and 0.200 or less, preferably 0.040 or less. The sheet-like material according to any one of <1> to <17>.
<19>
The width W2 of the elongated base portion is 0.3 mm or more, preferably 0.6 mm or more, and is 10 mm or less, preferably 2 mm or less, more preferably 1.8 mm or less. Specifically, The sheet-like material according to any one of <1> to <18>, which is 0.3 mm to 10 mm.
<20>
The sheet-like material according to any one of <1> to <19>, wherein the elongated base portion constituting the absorbent unit is a hydrophilic sheet.
<21>
The sheet-like material according to any one of <1> to <20>, wherein the elongate base portion constituting the absorbent unit is a nonwoven fabric.

<22>
The sheet-like material according to any one of <1> to <21>, wherein the water-absorbing polymer particles of the sheet-like material are fixed on the elongate base portion through an adhesive.
<23>
When the sheet-like material is used for an absorbent article and the particles of the water-absorbing polymer fixed to the side edges along the longitudinal direction of the long base portion absorb liquid and swell, The sheet-like material according to any one of <1> to <22>, wherein the position of the scale-like base portion is different from the position before absorbing the liquid in the thickness direction.
<24>
The sheet-like material according to any one of <1> to <23>, wherein, in a state after swelling, the positions of the long base portions constituting the adjacent absorbent unit are different in the thickness direction. Sheet-like material.
<25>
The distance between both side edges along the longitudinal direction of the elongated base portion is larger than the average particle size of the water-absorbing polymer particles before swelling, and more than the average particle size of the water-absorbing polymer particles after swelling. The sheet-like material according to any one of <1> to <24>, which is also smaller.

<26>
An absorbent body for an absorbent article, comprising the sheet-like material according to any one of <1> to <25> and a liquid-permeable core wrap sheet that covers the sheet-like material.
<27>
The absorbent article which has an absorber as described in said <26>, the surface sheet distribute | arranged to the skin opposing surface side of this absorber, and the back surface sheet distribute | arranged to the non-skin opposing surface side of this absorber.

<28>
A long base portion having a horizontal direction, a longitudinal direction longer than the horizontal direction, and a thickness direction, and particles of a water-absorbing polymer fixed to the surface of one surface of the long base portion A plurality of absorptive units provided with each of the absorptive units, the absorptive units being arranged so that the longitudinal direction thereof faces at least one direction,
Before the water-absorbing polymer particles absorb the liquid, the water-absorbing polymer particles are fixed to the surface of the one surface of the elongate base portion, and the longitudinal direction of the elongate base portion A method for producing a sheet-like article for absorbent articles that is fixed to the side edge along
A cutting step of cutting a base sheet to form a plurality of the long base portions, and a plurality of the long base portions formed in the cutting step at the widened portion, the adjacent lengths Widening step for widening the interval between the elongated base portions, and spraying the water-absorbing polymer particles on a plurality of the elongated base portions whose intervals between the elongated base portions adjacent to each other in the widening step. A method for producing a sheet-like material comprising a step of spraying water-absorbing polymer particles.

<29>
The method for producing a sheet-like material according to <28>, further including an adhesive application step of applying an adhesive before the water-absorbing polymer particle spraying step.
<30>
The post-cut process includes the widening process, the post-widening process includes the adhesive application process, the post-adhesive process includes a step of spraying the water-absorbing polymer particles,
The adhesive is applied in the adhesive application step from one surface of a plurality of the elongated base portions, which are formed in the widening step, and the intervals between the adjacent long base portions are widened. Then, the adhesive is applied to the surface of one surface of each of the long base portions and the side edge portion, and particles of the water-absorbing polymer are formed on one surface of the plurality of long base portions. The water-absorbing polymer particles are sprayed in a spraying step to form the sheet-like material in which the water-absorbing polymer particles are fixed to the side edges of the long base portion through the adhesive. The method for producing a sheet-like material according to <29>.

According to the present invention, there is provided a sheet-like material that hardly causes swelling inhibition and can maximize the absorption performance of the water-absorbing polymer. Moreover, according to this invention, the manufacturing method of the sheet-like material which can manufacture such a sheet-like material efficiently is provided.

Claims

A long base portion having a horizontal direction, a longitudinal direction longer than the horizontal direction, and a thickness direction, and particles of a water-absorbing polymer fixed to the surface of one surface of the long base portion A plurality of absorptive units, each of the absorptive units being arranged so that its longitudinal direction faces at least one direction,
Before the water-absorbing polymer particles absorb the liquid, the water-absorbing polymer particles are fixed to the surface of the one surface of the elongate base portion, and the longitudinal direction of the elongate base portion A sheet-like object that is fixed to the side edge along the line.
The sheet-like material includes a non-slit region in which a plurality of the elongated base portions are connected in the lateral direction at both ends in the vertical direction, and the water-absorbing polymer particles are present in the non-slit region. The sheet-like material according to claim 1, which is not arranged.
The sheet-like material according to claim 1 or 2, wherein both end portions in the longitudinal direction are fixed to the absorbent article.
When the sheet-like material is viewed in plan, the water-absorbing polymer particles are unevenly distributed and fixed, and in the portion where the basis weight of the fixed water-absorbing polymer is relatively large, The sheet-like article according to any one of claims 1 to 3, wherein a distance between both side edges along the longitudinal direction is relatively short.
5. The water-absorbing polymer particles are also fixed to the surface of the other surface of the elongated base portion before the water-absorbing polymer particles absorb the liquid. The sheet-like material described in 1.
The sheet-like material according to any one of claims 1 to 5, wherein no inclusion is present between the absorbent units adjacent in the lateral direction of the elongated base portion.
The sheet-like material according to any one of claims 1 to 6, wherein the absorbent unit is not wrapped with inclusions.
The absorbent unit is formed in a rectangular shape that is long in the vertical direction,
The sheet-like material according to any one of claims 1 to 7, wherein the absorbent unit has a lateral length Lx of not less than 0.5 mm and not more than 10 mm.
The sheet-like article according to any one of claims 1 to 8, wherein a length Ly of the absorbent unit in the vertical direction is 20 times or more and 200 times or less of the length Lx in the horizontal direction.
The sheet-like material according to any one of claims 1 to 9, wherein a longitudinal length Ly of the absorbent unit is 10 mm or more and 500 mm or less.
The size relationship of the length Lx in the lateral direction of the absorbent unit with respect to the width W2 of the long base portion is 0 mm <(Lx−W2) <1.4 mm. Item 1. The sheet-like material according to item 1.
The sheet-like material is formed in a rectangular shape that is long in the vertical direction in a state before use,
The sheet-like material according to any one of claims 1 to 11, wherein the sheet-like material has a length in the vertical direction of 100 mm or more and 1000 mm or less, and a length in the horizontal direction of 50 mm or more and 300 mm or less.
The sheet-like material has an absorption region in which a plurality of the absorptive units are arranged so as to face at least one direction in a state before use,
The sheet-like material according to any one of claims 1 to 12, wherein the ratio of the absorption region to the entire sheet-like material is 20% or more and 100% or less in plan view of the sheet-like material before use. object.
The absorptive unit is arranged such that its longitudinal direction faces the longitudinal direction of the sheet-like material,
The sheet-like material according to any one of claims 1 to 13, wherein the absorbent unit is arranged in an amount of 3 or more and 1000 or less per sheet-like material.
The absorptive unit is arranged such that its longitudinal direction faces the lateral direction of the sheet-like object,
The sheet-like material according to any one of claims 1 to 13, wherein the absorbent unit is arranged in an amount of 3 or more and 3500 or less per sheet-like material.
A plurality of the sheet-like objects in a state before use are arranged so that the longitudinal direction of the absorbent unit is oriented in the longitudinal direction of the sheet-like article, and the plurality of absorbent units do not cross each other. The sheet-like material according to any one of claims 1 to 14, which is arranged.
The sheet-like object includes a non-slit region where a plurality of the elongated base portions are connected in the lateral direction at both ends in the longitudinal direction,
The sheet material according to any one of claims 1 to 16, wherein when the sheet material is used for an absorbent article, both longitudinal ends of the sheet material are fixed to the absorbent article. .
The sheet-like material according to any one of claims 1 to 17, wherein a ratio of the width W2 of the long base portion to the width W1 of the sheet-like material is 0.001 or more and 0.200 or less.
The sheet-like material according to any one of claims 1 to 18, wherein a width W2 of the long base portion is 0.3 mm or more and 10 mm or less.
The sheet-like material according to any one of claims 1 to 19, wherein the elongated base portion constituting the absorbent unit is a hydrophilic sheet.
The sheet-like material according to any one of claims 1 to 20, wherein the elongated base portion constituting the absorbent unit is a non-woven fabric.
The sheet-like material according to any one of claims 1 to 21, wherein the water-absorbing polymer particles of the sheet-like material are fixed on the elongated substrate portion via an adhesive.
When the sheet-like material is used for an absorbent article and the particles of the water-absorbing polymer fixed to the side edges along the longitudinal direction of the long base portion absorb liquid and swell, The sheet-like material according to any one of claims 1 to 22, wherein the position of the scale-like base portion is different from the position before absorbing the liquid in the thickness direction.
The sheet according to any one of claims 1 to 23, wherein in the state after swelling, the positions of the elongated base portions constituting the adjacent absorbent units differ in the thickness direction. State.
The distance between both side edges along the longitudinal direction of the elongated base portion is larger than the average particle size of the water-absorbing polymer particles before swelling, and more than the average particle size of the water-absorbing polymer particles after swelling. The sheet-like material according to any one of claims 1 to 24, which is smaller.
An absorbent body for an absorbent article comprising the sheet-like material according to any one of claims 1 to 25 and a liquid-permeable core wrap sheet that covers the sheet-like material.
An absorbent article comprising the absorbent body according to claim 26, a top sheet disposed on the skin-facing surface side of the absorbent body, and a back sheet disposed on the non-skin facing surface side of the absorbent body.
A long base portion having a horizontal direction, a longitudinal direction longer than the horizontal direction, and a thickness direction, and particles of a water-absorbing polymer fixed to the surface of one surface of the long base portion A plurality of absorptive units provided with each of the absorptive units, the absorptive units being arranged so that the longitudinal direction thereof faces at least one direction,
Before the water-absorbing polymer particles absorb the liquid, the water-absorbing polymer particles are fixed to the surface of the one surface of the elongate base portion, and the longitudinal direction of the elongate base portion A method for producing a sheet-like article for absorbent articles which is fixed on the side edge along
A cutting step of cutting a base sheet to form a plurality of the long base portions, and a plurality of the long base portions formed in the cutting step at the widened portion, the adjacent lengths Widening step for widening the interval between the elongated base portions, and spraying the water-absorbing polymer particles on a plurality of the elongated base portions whose intervals between the elongated base portions adjacent to each other in the widening step. A method for producing a sheet-like material comprising a step of spraying water-absorbing polymer particles.
29. The method for producing a sheet-like product according to claim 28, further comprising an adhesive application step of applying an adhesive before the water-absorbing polymer particle spraying step.
The post-cut process includes the widening process, the post-widening process includes the adhesive application process, the post-adhesive process includes a step of spraying the water-absorbing polymer particles,
The adhesive is applied in the adhesive application step from the surface of one surface of a plurality of the elongated base portions, which are formed in the widening step, and the interval between adjacent long base portions is widened. The water-absorbing polymer particles are applied from the surface of one surface of the plurality of long base portions by applying and applying the adhesive to one surface of each of the long base portions and the side edge portion. The water-absorbing polymer particles are sprayed in the spraying step to form the sheet-like material in which the water-absorbing polymer particles are fixed on the side edge of the long base portion through the adhesive. The method for producing a sheet-like material according to claim 29.