JP2017070497A - Absorbent product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent product having an absorbent body configured to prevent degradation in permeability and diffusivity of the liquid in the absorbent body which is caused by a gel blocking of a water-absorbing polymer.SOLUTION: An absorbent product 10 includes: a plurality of water-absorbing units 4 having a longitudinal base part 2 and water-absorbing polymer particles 3; and an absorbent body 1 having each of the water-absorbing units 4 with a vertical direction Y thereof being aligned in one direction. The water-absorbing polymer particles 3 are fixed on both skin-facing surface and non-skin-facing surface of the longitudinal base part 2. Before the water-absorbing polymer particles 3 absorb the liquid, the particles 3 do not exceed a side edge part 2s of the longitudinal base part 2 to overflow in a lateral direction X. Also, even after the particles 3 absorb the liquid, the particles 3 are made not to swell to exceed the side edge part 2s.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an absorbent article.

  A proposal to reduce the amount of hydrophilic fibers such as pulp fibers used in conventional absorbents for the purpose of reducing the thickness of absorbents used in absorbent articles such as disposable diapers, sanitary napkins, and incontinence pads There are various. For example, Patent Document 1 uses, as an absorbent body of an absorbent article, a water absorbent sheet in which an absorbent layer containing a water absorbent resin and an adhesive is provided on the upper and lower surfaces of a breathable layer made of a nonwoven fabric or a net-like material. Have been described.

  In addition to this technique, a technique for improving the performance of an absorbent body by making a narrow cut called a slit or the like in an absorbent body used for an absorbent article is also known. For example, Patent Document 2 describes an absorbent article that includes an absorbent body having an excretion part slit region in which longitudinal slits along the vertical direction are formed in a dispersed state at the excretion part facing part. According to the literature, it is said that this absorbent article can enhance a feeling of wear.

  Patent Document 3 describes a sanitary napkin including an absorbent body in which four or more rows of slits arranged in the vertical direction or the horizontal direction are provided at intervals. According to this document, the napkin absorbent body can be easily deformed, and the rigidity of the absorbent body is relaxed by the slits, so that liquid leakage and a feeling of foreign matter are reduced.

International Publication No. 2011/43256 Pamphlet JP2015-42244A Japanese Utility Model Publication No. 63-18122

  According to the technique described in Patent Document 1, it is possible to reduce the thickness of the absorber, but on the other hand, if the absorber absorbs the liquid and the water-absorbing polymer swells, gel blocking occurs due to this, The absorption of the above liquid may be inhibited. In particular, as described in the same document, when water-absorbing polymers are arranged on the upper and lower surfaces of the sheet for the purpose of securing the liquid absorption capacity, gel blocking occurs in the water-absorbing polymers located on the upper surface side. There is a problem that it is difficult for the liquid to reach the water-absorbing polymer located on the lower surface side, and the water-absorbing performance of the water-absorbing polymer located on the lower surface cannot be effectively utilized. In the techniques described in Patent Documents 2 and 3, gel blocking may occur.

  Accordingly, an object of the present invention is to improve an absorbent body in an absorbent article, and more specifically, an absorption in which a decrease in liquid permeability and diffusibility in the absorbent body due to gel blocking of a water absorbent polymer is prevented. It is providing the absorbent article provided with the body.

The present invention relates to an elongated base portion having a lateral direction, a longitudinal direction longer than the lateral direction, and a thickness direction, and water-absorbing polymer particles fixed to the surface of the elongated base portion A plurality of absorptive units provided with an absorbent body in which each absorptive unit is arranged so that its longitudinal direction faces at least one direction,
The water-absorbing polymer particles are fixed to the surfaces of both the skin-facing surface and the non-skin-facing surface of the long base portion,
Before the water-absorbing polymer particles absorb the liquid, the water-absorbing polymer particles do not protrude laterally beyond the side edges along the longitudinal direction of the elongated substrate portion, and Even after the water-absorbing polymer particles absorb the liquid, the water-absorbing polymer particles do not swell beyond the side edges along the longitudinal direction of the elongated base portion. Articles are provided.

Further, the present invention provides, as one preferred method for producing the absorbent article, a distance in the lateral direction on the surface of one surface of the base sheet of the elongated substrate portion that is conveyed in one direction. Apply adhesive to multiple separated locations,
The base sheet of the long base portion with the adhesive applied to the surface of the one surface is transported along the transport direction in the base sheet of the long base portion. On the surface of the one surface to which the adhesive is applied, the particles of the water-absorbing polymer are dispersed over the entire region in the lateral direction,
The base sheet of the long base portion was transported along the transport direction, and a distance in the lateral direction was separated from the surface of the other surface of the base sheet of the long base portion. Apply adhesive to multiple locations,
The base sheet of the long base portion with the adhesive applied to the surface of the other surface is transported along the transport direction in the base sheet of the long base portion. Sprinkling water-absorbing polymer particles over the entire area in the lateral direction on the surface of the other surface to which the adhesive is applied,
The non-application part between the places where this adhesive was applied to the base sheet of the long base part in which particles of the water-absorbing polymer were dispersed on each surface, while being conveyed along the conveyance direction The manufacturing method of an absorbent article including the process of cut | incising along this conveyance direction, obtaining the elongate base part of several narrow strips, and manufacturing an absorber is provided.

  According to the present invention, even after the water-absorbing polymer particles are swollen by absorption of the liquid, the excreted liquid can permeate through the gap between the absorbent units, so that the permeation of the liquid is hardly hindered. Therefore, both of the water-absorbing polymer particles fixed to the upper and lower surfaces of the long base portion can be effectively utilized. Further, even after the water-absorbing polymer particles are swollen, the water-absorbing polymer particles do not exist between the absorbent units, so that liquid diffusion between the absorbent units is difficult to be inhibited, and the entire area of the absorber is liquid-impregnated. It can be used effectively for absorption retention. Further, by fixing the water-absorbing polymer particles on the upper and lower surfaces of the long base portion, the absorber temporarily absorbs the liquid from the low-viscosity and high-speed excreted liquid such as urine. Since it can be stocked, liquid leakage is less likely to occur.

Drawing 1 is a mimetic diagram of the section which meets a transverse direction showing one embodiment of an absorptive article of the present invention. FIG. 2 is a perspective view of an absorbent body in the absorbent article shown in FIG. FIG. 3 is a schematic diagram of a cross section along the horizontal direction showing a state in which the absorbent article shown in FIG. 1 absorbs liquid and the water-absorbing polymer particles swell. FIG. 4 is a schematic view showing an embodiment of the absorbent article manufacturing apparatus shown in FIG. 1. FIG. 5 is a schematic perspective view of the base sheet cut portion included in the manufacturing apparatus shown in FIG. 4. 6 is a schematic diagram (corresponding to FIG. 4) showing another embodiment of the absorbent article manufacturing apparatus shown in FIG. FIG. 7 is a perspective view (corresponding to FIG. 2) showing another embodiment of the absorbent body in the absorbent article of the present invention.

  Hereinafter, the present invention will be described based on preferred embodiments thereof. The absorbent article of the present invention is 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, and the like, but are not limited to these, and widely include articles used to absorb liquid discharged from the human body. is there.

  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 absorbent body. have. As the top sheet and the back 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. Moreover, the absorbent article may further include various members according to the specific application of the 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. 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. The sub-layer sheet is a liquid-permeable sheet disposed between the absorber and the top sheet or between the absorber and the back sheet.

  FIG. 1 schematically shows a cross section along the lateral direction showing an embodiment of the absorbent article of the present invention. In addition, unless otherwise indicated, the following description is based on the state before an absorbent article absorbs a liquid. The absorbent article 10 shown in the figure includes an absorbent body 1. A surface sheet 11 is disposed on the skin facing surface side of the absorbent body 1. On the other hand, a back sheet 12 is disposed on the non-skin facing surface side of the absorbent body 1. FIG. 2 is a perspective view of the absorbent body 1 in the absorbent article 10 shown in FIG.

  The absorbent body 1 includes a long base portion 2 having a horizontal direction, a vertical direction longer than the horizontal direction, and a thickness direction, and a water-absorbing polymer fixed to the surface of the long base portion 2 A plurality of absorptive units 4 provided with particles 3 (hereinafter also simply referred to as “water-absorbing polymer 3”), and each absorptive unit 4 is arranged so that its longitudinal direction is at least in one direction. Is formed. In the following description, the horizontal direction is represented by X, the vertical direction is represented by Y, and the thickness direction is represented by Z. The horizontal direction X, the vertical direction Y, and the thickness direction Z are orthogonal to each other. The transverse direction X, the longitudinal direction Y, and the thickness direction Z of the elongated base portion 2 are the same as the transverse direction X, the longitudinal direction Y, and the thickness direction Z of the absorbent unit 4, and in this embodiment, FIG. As shown, the transverse direction X, the longitudinal direction Y, and the thickness direction Z of the absorbent body 1 also coincide. The longitudinal direction Y of the absorbent body 1 also coincides with the wearer's front-rear direction when the absorbent article 10 is worn.

  As shown in FIG. 2, the absorbent body 1 is formed by arranging a plurality of absorbent units 4 such that the longitudinal direction Y of the absorbent unit 4 faces the longitudinal direction Y of the absorbent body 1. Between the absorbent units 4 and 4 adjacent to each other in the lateral direction X of the absorbent body 1, inclusions are absent from the viewpoint of ease of movement of the absorbent unit 4. For example, each absorptive unit 4 is in a state where it is not wrapped with inclusions.

The absorbent unit 4 of the absorber 1 is formed in a rectangular shape that is long in the vertical direction Y. The absorptive unit 4 has a length Lx in the lateral direction X of preferably 0.3 mm to 10 mm, more preferably 0.6 mm to 2.0 mm, and still more preferably 0.6 mm to 1.8 mm. is there. The length Ly in the longitudinal direction Y of the absorbent unit 4 is preferably 2 to 3500 times, more preferably 100 to 700 times the length Lx in the lateral 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 20 mm or more and 1000 mm or less, and more preferably 200 mm or more and 400 mm or less. Thus, the absorptive unit 4 has an elongated shape.
In this embodiment, since the water-absorbing polymer particles 3 are fixed to the side edges of the long base portion, the length Lx in the lateral direction X of the absorbent unit 4 with respect to the long base portion width W2 is determined. Is preferably 0 μm <(Lx−W2) <1400 μm, and more preferably 200 μm <(Lx−W2) <1000 μm.
In this embodiment, the absorber 1 is formed in a rectangular shape that is long in the longitudinal direction Y in a state before use. The absorbent body 1 has a length in the vertical direction Y of about 100 mm to 1000 mm and a length in the horizontal direction X of about 50 mm to 300 mm.

  Although not shown, the absorbent body 1 may include a core wrap sheet. The core wrap sheet is preferably arranged so as to cover at least a part of the absorbent unit 4 arranged in at least one direction. As the core wrap sheet, a sheet having liquid permeability is used. Examples of such a sheet include paper and hydrophilic nonwoven fabric.

  The absorber 1 has an absorption region AT in which a plurality of absorbent units 4 are arranged so as to face at least one direction. The absorbent body 1 including the absorbent region AT is disposed in the absorbent article 10 at least at a site corresponding to the excretion part of the wearer. From the viewpoint of facilitating liquid absorption in the region where the water-absorbing polymer particles 3 are fixed, the ratio of the area of the absorption region AT to the entire area of the absorber 1 in a plan view of the absorber 1 is 20% or more. It is preferably 50% or more, more preferably 100% or less, and still more preferably 90% or less. Specifically, it is preferably 20% or more and 100% or less, and more preferably 50% or more and 90% or less. The ratio of the absorption region AT is 100% means that, for example, the plurality of absorbent units 4 are arranged in the lateral direction X of the absorbent body 1 such that the longitudinal direction Y of the absorbent unit 4 faces the longitudinal direction Y of the absorbent body 1. In the case where they are juxtaposed with each other, it means a form in which the absorptive units 4 are arranged in the entire region between both end portions in the longitudinal direction Y of the absorber 1. In this case, the absorbent units 4 are arranged over the entire region in the longitudinal direction Y of the absorbent region AT so that the longitudinal direction Y faces the longitudinal direction Y of the absorbent article 10. Alternatively, when a plurality of absorbent units 4 are juxtaposed in the longitudinal direction Y of the absorbent body 1 so that the longitudinal direction Y of the absorbent unit 4 faces the lateral direction X of the absorbent body 1, as shown in FIG. Means a form in which the absorptive units 4 are arranged in the entire region extending between both side portions along the longitudinal direction Y of the absorbent body 1. When the absorber 1 is viewed in plan, the area other than the absorption area AT becomes a non-slit area NT described later.

  When arranging the longitudinal direction Y of the absorbent unit 4 so as to face the longitudinal direction Y of the absorbent body 1, it is preferable that 3 or more absorbent units 4 are disposed per absorbent body. More than this, it is more preferable that 1000 or less is preferable, and 500 or less is more preferable. Specifically, it is preferable that 3 or more and 1000 or less are arranged, and more preferably 50 or more and 500 or less are arranged. Moreover, when arrange | positioning so that the vertical direction Y of the absorptive unit 4 may face the horizontal direction X of the absorber 1, it is preferable that three or more absorptive units 4 are arrange | positioned per absorber. 50 or more are more preferable, 3500 or less are preferable, and 2000 or less are more preferable. Specifically, 3 or more and 3500 or less are preferable, and 50 or more and 2000 or less are more preferable. 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.

  From the viewpoint of ease of transport during manufacturing, the absorbent body 1 is preferably in a form in which a plurality of the absorbent units 4 are arranged so that the longitudinal direction Y of the absorbent unit 4 faces the longitudinal direction Y of the absorbent body 1. In particular, it is preferable that the plurality of absorbent units 4 are arranged so as not to cross each other. The absorbent body 1 shown in FIG. 1 uses a plurality of absorbent units 4 each having an elongated base portion 2 having a uniform width, and the longitudinal direction Y of the absorbent unit 4 is directed to the longitudinal direction Y of the absorbent body 1. The absorbent unit 4 is arranged.

  The absorbent body 1 is preferably provided with non-slit regions NT in which a plurality of long base portions 2 are connected in the lateral direction X at both ends in the longitudinal direction Y or on both sides along the longitudinal direction Y. For example, the absorbent body 1 includes non-slit regions NT extending along the horizontal direction X at both ends in the vertical direction Y, as shown in FIG. That is, in the absorbent body 1 of this embodiment, the base material sheet 20 is provided, the non-slit region NT is provided at both ends in the longitudinal direction Y of the base material sheet 20, and the non-slit region NT. A plurality of elongate base portions 2 formed by a cutting process described later are provided. Providing such a non-slit region NT has an advantageous effect that the sheet shape of the absorbent body 1 is easily maintained in a state before use, the structure is not easily disturbed, and is easily transported during manufacturing. It is preferable that the water-absorbing polymer particles 3 are not arranged in the non-slit region NT. That is, it is preferable that the absorbent body is not provided with the water-absorbing polymer particles 3 in the end region in the longitudinal direction Y. If the water-absorbing polymer particles 3 are not arranged in the non-slit region NT, even if the absorbent 1 absorbs the liquid, the non-slit region NT is affected by deformation caused by the swelling of the water-absorbing polymer particles 3. Therefore, even in the state after swelling, the sheet shape of the absorbent body 1 is easily maintained, and the structure is not easily disturbed. At the same time, the liquid is easily absorbed in the region where the water-absorbing polymer particles 3 are arranged. As a result, there is an advantage that the entire absorbent body 1 can easily balance the liquid absorbency and the maintenance of the sheet shape. In particular, it is preferable that the water-absorbing polymer particles 3 are not disposed in both end regions in the longitudinal direction Y of the long base portion 2 because the advantageous effects described above become more remarkable. Here, the state after swelling means the state of the water-absorbing polymer particles after the absorbent body 1 is immersed for 60 minutes in a physiological saline (0.9 mass% sodium chloride aqueous solution) adjusted to 25 ° C. To do.

  When the non-slit area | region NT extended along the horizontal direction X is provided in the edge part area | region of the vertical direction Y like the absorber 1 shown in FIG. 2, the edge part area | region of the vertical direction Y in the absorber 1, especially It is preferable that both end regions are fixed to any member constituting the absorbent article 10. This is because the sheet shape of the absorbent body 1 is easily maintained, the structure is less likely to be disturbed, and the softness of the absorption area AT is improved, making it difficult for the wearer to feel uncomfortable. The member is a member adjacent to the absorbent body 1 on the skin facing surface side, or a member adjacent to the non-skin facing surface side, preferably a member adjacent to the absorbent body 1 on the skin facing surface side and a non-skin Both of the adjacent members on the skin facing surface side. Examples of such members include the front sheet 11 and / or the sublayer sheet on the skin facing surface side, and the back sheet 12 and / or the sublayer sheet on the non-skin facing surface side. In addition, when the absorber 1 is provided with the core wrap sheet, the absorber 1 is fixed to the other member means that the absorbent unit 4 is fixed to the core wrap sheet and the core wrap sheet is It means being fixed to another member. In this case, the fixing position F1 between the absorbent unit 4 and the core wrap sheet and the fixing position F2 between the core wrap sheet and another member may be the same position or different positions.

  In the part where the absorbent unit 4 constituting the absorbent body 1 is formed, the absorbent unit 4 is on the other member adjacent to the absorbent unit 4 on the skin facing surface side or on the non-skin facing surface side. It is preferably in a non-bonded state with other adjacent members. For example, when the absorptive unit 4 is in a non-joined state with other adjacent members on the non-skin facing surface side, the liquid that has permeated through the gap S described later is on the non-skin facing surface side of the absorptive unit 4. It becomes easy to diffuse. As a result, the utilization factor of the water-absorbing polymer particles 3 located on the non-skin facing surface side of the absorbent unit 4 is improved. Moreover, when the absorptive unit 4 is in a non-joined state with another member adjacent on the skin facing surface side, and is in a non-joined state with another member adjacent on the non-skin facing surface side, After the absorbent polymer particles 3 absorb the liquid and swell, the absorbent unit 4 easily moves along the thickness direction Z. This is advantageous in terms of improving the diffusibility of the liquid in the absorbent body 1 and improving the flexibility of the absorbent body 1.

  As shown in FIG. 1, in the absorbent body 1, water-absorbing polymer particles 3 are fixed to both the skin-facing surface and the non-skin-facing surface of the elongated base portion 2. That is, the water-absorbing polymer particles 3 are fixed to both the surface facing the top sheet 11 and the surface facing the back sheet 12 in the long base portion 2. It is preferable that the side surface of the elongated base portion 2 is in a state where the water-absorbing polymer particles 3 are not present or the water-absorbing polymer particles 3 are not fixed. Further, in the absorbent body 1 in a state before absorbing the liquid, as shown in the figure, the positions of the elongated base portions 2 constituting the adjacent absorbent units 4 are substantially the same in the thickness direction Z. Yes. That is, each elongate base | substrate part 2 is located on the substantially same plane.

In the absorbent body 1, when viewed along the longitudinal direction Y, the water-absorbing polymer particles 3 are present almost uniformly in any part of the longitudinal direction Y. Similarly, when the absorbent body 1 is viewed along the lateral direction X, the water-absorbing polymer particles 3 are present almost uniformly in any part of the lateral direction X. As described above, in the absorbent body 1, the water-absorbing polymer particles 3 exist substantially uniformly in the XY plane including the longitudinal direction Y and the transverse direction X. It replaces with the presence aspect of the particle | grains 3 of such a water absorbing polymer, and when the absorber 1 is seen along the horizontal direction X, a difference is provided in the basic weight of the water absorbing polymer 3 in a center area and a side part area. be able to. For example, the basis weight of the water-absorbing polymer 3 in the central region can be made higher than the basis weight of the water-absorbing polymer 3 in the side region. Conversely, the basis weight of the water-absorbing polymer 3 in the central region can be made lower than the basis weight of the water-absorbing polymer 3 in the side region. In this case, the difference in the basis weight of the water-absorbing polymer 3 between the central region and the side region may change stepwise, or may change continuously (gradual decrease or gradual increase).
The same applies to the longitudinal direction Y, and a difference in the basis weight of the water-absorbing polymer 3 can be provided between the central region and the end region. For example, when the absorbent body 1 is viewed along the longitudinal direction Y, the basis weight of the water-absorbing polymer 3 in the central region can be made higher than the basis weight of the water-absorbing polymer 3 in the end region. Conversely, the basis weight of the water-absorbing polymer 3 in the central region can be made lower than the basis weight of the water-absorbing polymer 3 in the end region. In this case, the difference in basis weight of the water-absorbing polymer 3 between the central region and the end region may be changed stepwise, or may be continuously changed (gradual decrease or increase).

  Further, in the absorbent body 1, as shown in FIG. 1, before the water-absorbing polymer particles 3 absorb the liquid, the water-absorbing polymer particles 3 are on the side along the longitudinal direction Y of the long base portion 2. It does not protrude in the lateral direction X beyond the edges 2s, 2s. In addition to this, a gap S is formed between the absorbent units 4 adjacent in the lateral direction X in a state before the water-absorbing polymer particles 3 absorb the liquid. The degree of the gap S is preferably 0.1 mm or more, and more preferably 0.5 mm or more. Moreover, it is preferable that it is 5 mm or less, and it is still more preferable that it is 3 mm or less. For example, the degree of the gap S is preferably 0.1 mm or more and 5 mm or less, and more preferably 0.5 mm or more and 3 mm or less.

  On the other hand, in the absorbent body 1, as shown in FIG. 3, even after the water-absorbing polymer particles 3 absorb the liquid, the water-absorbing polymer particles 3 are along the longitudinal direction Y of the elongated base portion 2. It is made not to swell beyond the side edges 2s, 2s. For this purpose, in the present embodiment, in the absorbent unit 4 of the absorbent body 1, the long base portion 2 and the water-absorbing polymer particles 3 are fixed via an adhesive 5.

In the absorbent body 1, the ratio (W2 / W1) of the width W2 of the elongated base portion 2 to the width W1 of the absorbent body 1 is the amount of water-absorbing polymer particles 3 supported on the elongated base portion 2 and inhibits swelling. From the viewpoints of flexibility, air permeability, maintenance of the sheet shape of the absorbent body 1 and the like, it is preferably 0.001 or more, more preferably 0.002 or more, and 0.200 or less. Is preferable, and it is still more preferable that it is 0.040 or less. Specifically, it is preferably 0.001 or more and 0.200 or less, and more preferably 0.002 or more and 0.040 or less.
From the same viewpoint, the width W2 of the elongated base portion 2 is preferably 0.3 mm or more, more preferably 0.6 mm or more, and preferably 10 mm or less, 2.0 mm. More preferably, it is more preferably 1.8 mm or less. Specifically, the width W2 of the elongated base portion 2 is preferably 0.3 mm or more and 10 mm or less, more preferably 0.6 mm or more and 2.0 mm or less, and 0.6 mm or more and 1.8 mm. More preferably, it is as follows. The width W2 of the long base portion 2 is a distance between both side edges of the long base portion 2 along the longitudinal direction Y. The width W1 of the absorbent body 1 is a distance between both side edges of the absorbent body 1 along the longitudinal direction Y.

The elongate base | substrate part 2 (base material sheet) which comprises the absorptive unit 4 is a hydrophilic thing, or a hydrophobic thing. 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 contact angle of the surface 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, nonwoven fabric, woven fabric, and knitted fabric that are fiber sheets configured to contain hydrophilic fibers. Moreover, the foam etc. which are comprised including hydrophilic resin are mentioned. These hydrophilic sheets can be used alone or in combination of two or more. On the other hand, the hydrophobic sheet is defined as a sheet having a contact angle of 90 ° or more of one constituent fiber, or a sheet having a contact angle of 90 ° or more in the case of a sheet that is not a fiber material. In addition, the measuring method follows the following method. As the hydrophobic sheet, for example, a sheet-like material including a hydrophobic material can be used. Examples thereof include a nonwoven fabric that is a fiber sheet configured to include hydrophobic fibers. Moreover, the foam etc. which are comprised including hydrophobic resin are mentioned. These hydrophobic sheets can be used alone or in combination of two or more. Regardless of whether the long base portion 2 is hydrophilic or hydrophobic, the long base portion 2 has a relatively high tensile strength even if it is thin, and is thin and highly flexible. From the viewpoint, a nonwoven fabric is 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. In addition, as the hydrophobic nonwoven fabric, for example, a spunbond nonwoven fabric, a meltblown nonwoven fabric, a spunlace nonwoven fabric, an air-through nonwoven fabric or the like that uses a polyolefin-based resin such as polyethylene or polypropylene is used without particular limitation. Can do.

  In particular, when the long base portion 2 is a hydrophobic sheet, the diffusibility of the liquid in the absorbent body 1 is further improved and the liquid spreads over the entire area of the absorbent body 1. All of the fixed water-absorbing polymer particles 3 can be used effectively. Moreover, when the elongate base | substrate part 2 is hydrophobic, it can prevent effectively that the liquid which permeate | transmitted through the clearance gap S which arises between the adjacent absorptive units 4 and 4 returns by a wearer's body pressure. There is also an advantage.

<Measurement method of hydrophilicity of long base part>
The contact angle of water with the constituent fibers of the sheet forming the long base portion or the contact angle of water with 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 discharged from an ink jet type water droplet discharge part (manufactured by Cluster Technology, Inc., pulse injector CTC-25 having a discharge part pore diameter of 25 μm) is set to 20 picoliters, and a water drop is dropped directly 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 in which water droplets land 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 2.6.2, analysis method) Is the droplet method, the analysis method is the θ / 2 method, the image processing algorithm is non-reflective, the image processing image mode is frame, the threshold level is 200, and the curvature is not corrected) The angle formed between the air contact surface and the constituent fibers 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 the surface of the long base portion 2, various polymers conventionally used in the technical field of absorbent articles can be used. For example, poly (sodium acrylate), (acrylic acid-vinyl alcohol) copolymer, cross-linked poly (sodium acrylate), (starch-acrylic acid) graft polymer, (isobutylene-maleic anhydride) copolymer and saponified product thereof, Examples include potassium polyacrylate, cesium polyacrylate, and the like. One of these can be used alone, or two or more can be mixed and used. As the water-absorbing polymer particles 3, there are an amorphous type, a block type, a bowl type, a spherical particle aggregation type, a spherical type, and the like due to the difference in shape, and any type can be used.

  The water-absorbing polymer 3 fixed to the surface on the skin facing surface side in the long base portion 2 and the water-absorbing polymer 3 fixed to the surface on the non-skin facing surface side in the long base portion 2 are the same type. It may be different or different. From the viewpoint of imparting various additional performances to the absorbent body 1, the water-absorbing polymer 3 fixed to the skin-facing surface side surface of the long base portion 2 and the non-skin in the long base portion 2. It is preferable that the water-absorbing polymer 3 fixed to the surface on the opposite surface side is different. Here, that the water-absorbing polymers are different means that the liquid passing speed under pressure or the centrifugal holding amount is different. For example, from the viewpoint of holding a large amount of liquid on the non-skin facing surface and improving the touch without leaving any liquid on the skin facing surface, the liquid is fixed to the surface on the skin facing surface side of the long base portion 2. It is preferable that the water-absorbing polymer 3 has a higher liquid passing performance under pressure and a lower centrifugal retention amount than the water-absorbing polymer 3 fixed to the surface on the non-skin-facing surface side in the long base portion. .

  From the above viewpoint, with respect to the water-absorbing polymer 3 fixed to the skin-facing surface side 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, the liquid flow rate under pressure is 20 ml / min or more. It is preferably 1000 ml / min or less, more preferably 40 ml / min or more and 800 ml / min or less. On the other hand, with respect to the water-absorbing polymer 3 fixed to the surface on the non-skin-facing surface side in 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, preferably 400 ml / min or less, more preferably 200 ml / min or less. Specifically, the liquid passing rate under pressure is 0 ml / min or more and 400 ml / min or less. It is preferably min or less, more preferably 10 ml / min or more and 200 ml / min or less. The liquid passing speed under pressure is determined by a measurement method described later.

From the viewpoint of the liquid flow rate under pressure described above, the centrifugal retention amount is preferably 20 g / g or more with respect to the water-absorbing polymer 3 fixed to the skin-facing surface side in the long base portion 2, and 25 g / G or more, more preferably 50 g / g or less, and even more preferably 45 g / g or less. Specifically, the centrifugal retention amount is 20 g / g or more and 50 g / g or less. It is preferable that it is 25 g / g or more and 45 g / g or less. On the other hand, regarding the water-absorbing polymer 3 fixed to the surface on the non-skin-facing surface side in the long base portion 2, the centrifugal retention amount is preferably 25 g / g or more, and preferably 30 g / g or more. More preferably, it is preferably 65 g / g or less, more preferably 55 g / g or less. Specifically, the centrifugal retention amount is preferably 25 g / g or more and 65 g / g or less, preferably 30 g / G or more and 55 g / g or less is still more preferable. The centrifugal retention amount is determined by a measurement method described later.
Here, the difference in the amount of centrifugal retention refers to the case where the amount of centrifugal retention measured by the following measurement method differs by 3 g / g or more. The water-absorbing polymer 3 fixed to the surface on the skin-facing surface side in the long base portion 2 is compared with the water-absorbing polymer 3 fixed to the surface on the non-skin facing surface side in the long base portion. It is preferable that the centrifugal holding amount is as low as 5 g / g or more, more preferably as low as 7 g / g or more.

<Measurement method of liquid flow rate under pressure>
The liquid passing rate under pressure is measured using a measuring method and a measuring apparatus described in JP-A-2003-235889. That is, a 100 mL glass beaker was charged with 0.32 ± 0.005 g of a water-absorbing polymer as a measurement sample, and a sufficient amount of physiological saline (0.9 mass) to swell this amount of water-absorbing polymer 3. % Sodium chloride aqueous solution), for example, physiological saline at least 5 times the saturated absorption of the water-absorbing polymer is added and left 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 the 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 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. Have been described.

<Measuring method of centrifugal retention>
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 (Kokusan Co., Ltd., model H-130C special model). 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′−b−c) / 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.

The water-absorbing polymer 3 fixed to the surface of the elongated base portion 2 has a basis weight of preferably 20 g / m ² or more, and more preferably 50 g / m ² or more. Moreover, it is preferable that it is 400 g / m < ² > or less, and it is still more preferable that it is 300 g / m < ² > or less. For example, the basis weight of the water-absorbing polymer 3 is preferably 20 g / m ² or more and 400 g / m ² or less, and more preferably 50 g / m ² or more and 300 g / m ² or less. Sufficient water-absorbing performance can be obtained by fixing the water-absorbing polymer particles 3 with a basis weight within this range.

The basis weight of the water-absorbing polymer 3 fixed on the skin facing surface side in the long base portion 2 and the basis weight of the water-absorbing polymer 3 fixed on the non-skin facing surface side in the long base portion 2 May be the same or different. When both are different from the basis weight of the water-absorbing polymer 3 fixed to the skin-facing surface side in the long base portion 2 among the water-absorbing polymers 3 fixed to the long base portion 2, It is preferable that the basis weight of the water-absorbing polymer 3 fixed to the non-skin facing surface side in the long base portion 2 is higher. By carrying out like this, since the water-absorbing polymer particles 3 fixed on the non-skin facing surface side can be used effectively, the amount of the water-absorbing polymer 3 fixed on the skin facing surface side is reduced, and the absorbent body The amount of water-absorbing polymer 3 used as a whole can be reduced. Further, since the liquid storage layer is easily formed on the non-skin facing surface side of the elongated base portion 2, the amount of the water-absorbing polymer particles 3 fixed on the skin facing surface side can be reduced, whereby the liquid The amount of return can be further reduced. When the basis weight of the water absorbent polymer 3 fixed on the non-skin facing surface side is higher than the skin facing surface side, the non-skin facing with respect to the basis weight B1 of the water absorbent polymer 3 fixed on the skin facing surface side The value of B2 / B1, which is the ratio of the basis weight B2 of the water-absorbing polymer 3 fixed on the surface side, is preferably 1.05 or more, and more preferably 1.7 or more. Moreover, it is preferable that it is 40 or less, and it is still more preferable that it is 10 or less. For example, the value of B2 / B1 is preferably 1.05 or more and 40 or less, and more preferably 1.7 or more and 10 or less.
The basis weight of the water-absorbing polymer 3 fixed to the skin facing surface side in the long base portion 2 and the basis weight of the water-absorbing polymer 3 fixed to the non-skin facing surface side in the long base portion 2 are as follows. Measure by the method.
<The basis weight of the water-absorbing polymer 3 fixed to the skin facing surface side in the long base portion 2 and the basis weight of the water-absorbing polymer 3 fixed to the non-skin facing surface side in the long base portion 2 Measuring method>
In order to prevent the water-absorbing polymer on the non-skin-facing surface side in the long base portion 2 from dropping off, the water-absorbing polymer fixed on the skin-facing surface side is fixed again from the upper surface of the water-absorbing polymer with an adhesive or the like. Then, the adhesive is adhered to the water-absorbing polymer by peeling off from the long base portion 2 using a solvent or the like. After drying the water-absorbing polymer, the weight of the water-absorbing polymer fixed on the skin-facing surface side is measured, and the area of the elongated base portion 2 where the water-absorbing polymer is fixed is separated from the water-absorbing polymer. The weight of the water-absorbing polymer fixed per unit area is calculated from the weight of the polymer, and the basis weight of the water-absorbing polymer on the skin facing surface side is calculated. Five measurements are taken and the average value is calculated.
The basis weight of the water-absorbing polymer on the non-skin facing surface side is similarly calculated by fixing the water-absorbing polymer on the skin-facing surface side, peeling off and cleaning the water-absorbing polymer on the non-skin facing surface side.

  Examples of a method for fixing the water-absorbing polymer particles 3 to the surface of the elongated base portion 2 include a method using an adhesive and a method using a hydrogen bond or the like for chemical fixing. Further, when the long base portion 2 is a fiber sheet such as a nonwoven fabric, a woven fabric, or a knitted fabric, a method of raising the constituent fibers and fixing the water-absorbing polymer particles 3 between the raised constituent fibers. Can also be adopted. In the absorbent body 1 shown in FIG. 1, an adhesive 5 is used. That is, the water-absorbing polymer particles 3 of the absorbent body 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 elongate base portion 2 via the adhesive 5, the water-absorbing polymer particles 3 in the state before use or after swelling of the absorbent body 1. Since the particles 3 are less likely to fall off, 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 hot melt adhesives. 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 absorbent article 10 of the present embodiment having the above-described configuration, the water-absorbing polymer particles 3 are in the longitudinal direction of the elongated base portion 2 in any state before and after the water-absorbing polymer particles absorb the liquid. Since it does not protrude in the lateral direction X beyond the side edges 2s, 2s along Y, gel blocking of the water-absorbing polymer particles 3 is unlikely to occur, and the diffusibility and permeability of the liquid in the absorbent body 1 are reduced. The advantageous effect that it is hard is produced. In particular, if the water-absorbing polymer particles 3 swell beyond the side edges 2s and 2s of the elongated base portion 2 after the water-absorbing polymer particles 3 have absorbed the liquid, gel blocking tends to occur. However, in the absorbent article 10 of this embodiment, the occurrence of such gel blocking is effectively suppressed. Thereby, the particles of the water-absorbing polymer 3 fixed to the skin contact surface side (skin facing surface side) and the non-skin contact surface side (non-skin facing surface side), respectively, across the long base portion 2. Both can be utilized effectively and the water absorption performance of the absorber 1 can be improved. In addition, the liquid is easily stored on the non-skin contact surface side in the long base portion 2, thereby effectively preventing the liquid from returning.
Further, by fixing the water-absorbing polymer particles 3 on the upper and lower surfaces of the long base portion, the absorber temporarily stocks the liquid with a low viscosity and high-speed excretion such as urine. it can. As a result, liquid leakage is less likely to occur.
Furthermore, in the absorbent article 10 of the present embodiment, the gap S is maintained between the adjacent absorbent units 4 even after the particles of the water-absorbing polymer 3 have absorbed the liquid. Even after absorbing the liquid, it exhibits flexibility as if it were a single sheet.

  After the water-absorbing polymer particles 3 have absorbed the liquid, as shown in FIG. 3, the positions of the elongated base portions 2 and 2 constituting the adjacent absorbent unit 4 are different in the thickness direction Z. The absorbent unit 4 is easy to move. Here, “differing in the thickness direction Z” includes, for example, a case where they deviate vertically, a case where they deviate obliquely, or a case where both occur. This movement is caused by an increase in volume due to swelling of the water-absorbing polymer particles 3. This movement includes both the parallel movement of the long base portion 2 along the thickness direction Z and the inclination of the long base portion 2 with respect to the thickness direction Z. Due to this movement, the gap S is easily maintained between the adjacent absorbent units 4 even after the water-absorbing polymer particles 3 have absorbed the liquid. This also effectively suppresses the occurrence of gel blocking and makes it difficult for the liquid to pass along the thickness direction Z.

  Absorption of liquid before absorption of liquid from the viewpoint of making it easy to move the absorbent units 4 and 4 freely along the thickness direction Z by the absorption of the liquid and making it more difficult to inhibit swelling of the water-absorbing polymer particles 3. The average particle diameter d1 of the conductive polymer particles 3 is preferably 20 μm or more, more preferably 200 μm or more, and preferably 700 μm or less, and more preferably 500 μm or less. 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 diameter d2 of the swollen water-absorbing polymer particles 3 that has absorbed the liquid is preferably 200 μm or more, more preferably 800 μm or more, and preferably 3000 μm or less. More preferably, it is 2000 μm or less. Specifically, 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.

<Method for Measuring Average Particle Diameter d1 of Water-Absorbing Polymer Particles Before Absorbing Liquid>
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. The diameter here refers to the diameter when the water-absorbing polymer particles are spherical. The long axis refers to the longest axis when the water-absorbing polymer particles have an irregular shape such as a rhombus, rectangle, tuft, and 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 absorbing liquid>
The average particle diameter d2 in the swollen state is obtained by immersing the long base portion 2 on which the water-absorbing polymer particles are fixed in a physiological saline (0.9 mass% sodium chloride aqueous solution) adjusted to 25 ° C. After 1 hour from the start of immersion, the long base portion 2 is taken out from the physiological saline, suspended in a vertical state for 30 minutes, drained, and then the diameter or long axis of the water-absorbing polymer particles on the surface of the long base portion 2 Was measured by optical microscope observation. The diameter here refers to the diameter when the water-absorbing polymer particles are spherical. The long axis refers to the longest axis when the water-absorbing polymer particles have an irregular shape such as a rhombus, rectangle, tuft, and 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.

  Further, from the viewpoint of easily moving the absorbent units 4 and 4 along the thickness direction Z by absorbing the liquid, the width W2 of the elongated base portion 2 and the water-absorbing polymer in the state before absorbing the liquid Regarding the relationship with the average particle diameter d1, the value of d1 / W2 is preferably 0.002 or more, and more preferably 0.100 or more. Moreover, it is preferable that it is 0.900 or less, and it is still more preferable that it is 0.800 or less. For example, the value of d1 / W2 is preferably 0.002 or more and 0.900 or less, and more preferably 0.100 or more and 0.800 or less. On the other hand, the relationship between the width W2 of the elongated base portion 2 and the average particle diameter d2 of the water-absorbing polymer particles after absorbing the liquid is such that the value of d2 / W2 is 0.02 or more. Preferably, it is 0.45 or more. Moreover, it is preferable that it is 0.90 or less, and it is still more preferable that it is 0.80 or less. For example, the value of d2 / W2 is preferably 0.02 or more and 0.90 or less, and more preferably 0.45 or more and 0.80 or less.

  Next, a preferred embodiment of a method for producing the absorbent article 10 of the present embodiment will be described with reference to FIG. FIG. 4 shows a manufacturing apparatus 100 that is preferably used in the method for manufacturing the absorbent article 10 of the present embodiment. The manufacturing apparatus 100 of the present embodiment has a first adhesive application unit 120, a first water-absorbing polymer spraying unit 130, a second adhesive application unit 140, and a second water-absorbing unit from the upstream side to the downstream side of the manufacturing process. The polymer dispersion | distribution part 150 and the base material sheet cut part 110 are provided in this order. In addition, in the manufacturing apparatus 100 shown in FIG. 4, the apparatus with which the 1st adhesive agent application part 120 and the 1st water absorbing polymer distribution part 130 were integrated, and the 2nd adhesive agent application part 140 and the 2nd water absorbing polymer distribution part. Although the apparatus with which 150 is integrated is used, these may not be integrated. The integrated device has a configuration in which adhesive application portions 120 and 140 are disposed on the upstream side of the device, and water-absorbing polymer spraying portions 130 and 150 are disposed on the downstream side of the integrated device. .

  The first adhesive application unit 120 is configured to increase the distance in the lateral direction X of the surface of one surface of each long base portion 2 in a state where the plurality of long base portions 2 are transported along the transport direction. This is a portion where an adhesive is applied to a plurality of separated locations. In the manufacturing apparatus 100 of this embodiment, the coating head 121 is provided as shown in FIG. As the coating head 121, a coating head having a structure capable of coating the adhesive 5 on a surface of one surface of the base sheet 20 conveyed in one direction from a plurality of locations separated in the lateral direction X. 121 can be used. The coating head 121 is formed in the X1 direction so as to have a length corresponding to the width of the absorption region AT of the absorber 1, that is, the length in the lateral direction X. The coating head 121 configured as described above is disposed on one surface of the long base portion 2.

  The second adhesive application unit 140 is located on the downstream side of the first water-absorbing polymer spray unit 130. The 2nd adhesive application part 140 has the same structure as the 1st adhesive application part 120, and is the distance in the horizontal direction X on the surface of the other side of substrate sheet 20 conveyed in one direction. An application head 141 having a structure capable of applying the adhesive 5 from a plurality of locations separated from each other can be used. In FIG. 4, the member denoted by reference numeral 141 in the second adhesive application unit 140 is an application head having the same structure as the application head 121 provided in the first adhesive application unit 120.

  The first water-absorbing polymer spraying unit 130 located on the downstream side of the first adhesive application unit 120 is configured to move the long base portion 2 to which the adhesive is applied by the first adhesive application unit 120 along the conveyance direction. In this state, the water-absorbing polymer particles 3 are dispersed over the entire region in the lateral direction X of the surface of one surface of the long base portion 2 to which the adhesive is applied in the state of being conveyed. In the manufacturing apparatus 100 of this embodiment, as shown in FIG. 4, a water-absorbing polymer introduction part 131 is provided. 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 of the absorption region AT of the absorbent body 1, that is, the length in the lateral direction X, in the X1 direction. Water-absorbing polymer Water-absorbing polymer The water-absorbing polymer introduction part 131 configured in this way is arranged on one surface of the elongated base part 2.

  The second water-absorbing polymer spray unit 150 is located on the downstream side of the second adhesive application unit 140. The second water-absorbing polymer spraying part 150 has the same structure as the first water-absorbing polymer spraying part 130, and the long base part 2 to which the adhesive is applied by the second adhesive application part 140, It is a part where the particles 3 of the water-absorbing polymer are scattered over the entire region in the lateral direction X of the surface of the other surface of the long base portion 2 where the adhesive is applied in a state of being conveyed along the conveying direction. . In FIG. 4, the member denoted by reference numeral 151 in the second water-absorbing polymer spraying section 150 has a structure similar to that of the water-absorbing polymer introducing section 131 provided in the first water-absorbing polymer spraying section 130. It is.

  The base sheet cut portion 110 located on the downstream side of the second water-absorbing polymer spraying portion 150 is along the conveying direction of the strip-shaped base sheet 20 that is a raw material of the long base portion 2 and has hydrophilicity. This is a part where a plurality of strips are cut to obtain a plurality of narrow and long elongated base portions 2. In order to make a plurality of cuts in the base sheet 20, various known cutting devices can be used without particular limitation. In the manufacturing apparatus 100 of the present embodiment, as shown in FIG. 5, the rotary die 111b having a plurality of cutter blades 111a, 111a, 111a,. A cutting device 113 including a receiving roll 112 having a flat peripheral surface is used. Each cutter blade 111a of the cutting device 113 is arranged along 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 X1 orthogonal to the. The interval between the cutter blades 111a and 111a adjacent to each other in the orthogonal direction X1 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 of the base sheet 20 corresponds to the longitudinal direction (Y direction) of the manufactured absorbent body 1, and the orthogonal direction X1 is the lateral direction (X direction) of the manufactured absorbent body 1. ). The base sheet 20 may be cut by using a shear cutting type cutting device that rubs and cuts the side surfaces of the upper blade and the lower blade, and a device in which a plurality of score cut knives are juxtaposed in a direction X1 perpendicular to each other. Alternatively, a laser device that melts by irradiating a laser beam may be used.

  When the absorber 1 includes the non-slit regions NT at both ends in the longitudinal direction Y like the absorber 1 shown in FIG. 2, for example, as shown in FIG. 5, the peripheral surface of each cutter blade 111 a In addition, the recess 114 may be formed. The length of the arc of the concave portion 114 at the outer periphery of the rotating cutter blade 111a is equal to the sum of the lengths in the vertical direction (Y direction) of the non-slit regions NT arranged at both ends of the absorber 1 shown in FIG. Try to accommodate the length. 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 blade 111a adjacent to each other in the direction X1 are aligned. Good. In addition, the length of the circular arc of the part except the recessed part 114 in the outer periphery of the rotating cutter blade 111a respond | corresponds to the length of the vertical direction Y of the elongate base | substrate part 2 which the absorber 1 shown in FIG. Moreover, when the absorber 1 is provided with the non-slit area | region NT in the both sides along the vertical direction Y, what is necessary is just not to distribute the cutter blade 111a in the position corresponding to this non-slit area | region NT.

  In the manufacturing apparatus 100 shown in FIG. 4, a plurality of long base parts which are conveyed at a position facing the apparatus in which the first adhesive application part 120 and the first water-absorbing polymer dispersion part 130 are integrated. The vacuum conveyor 141 is arranged on the lower surface side (the other 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 elongated base portions 2 are introduced. Although not shown, a vacuum conveyor having the same structure as the vacuum conveyor 141 is also arranged at a position facing the device in which the second adhesive application unit 140 and the second water absorbent polymer spraying unit 150 are integrated. Yes.

  In the manufacturing apparatus 100 shown in FIG. 4, the drive roll 151 that feeds the base sheet 20 from the raw roll of the belt-shaped base sheet 20 and the precursor 1 b of the manufactured absorbent body 1 are conveyed to the most downstream side. And a drive roll 152.

A method for manufacturing an absorbent article including the absorbent body 1 using the manufacturing apparatus 100 described above will be described below. This manufacturing method includes the following steps.
(A) The process of apply | coating an adhesive agent to the surface of the one surface of the base material sheet conveyed by one direction in the several places spaced apart in the horizontal direction.
(B) The substrate sheet coated with the adhesive is transported along the transport direction, and the surface of the one surface of the substrate sheet coated with the adhesive is in the lateral direction. A process of spraying water-absorbing polymer particles over the entire area.
(C) The substrate sheet, in which water-absorbing polymer particles are dispersed on the surface of the one surface, is transported along the transport direction, and the surface of the other surface of the substrate sheet is The process of applying an adhesive to a plurality of locations that are spaced apart in the direction.
(D) In the state where the base material sheet coated with the adhesive is transported along the transport direction, on the surface of the other surface of the base material sheet coated with the adhesive, the lateral direction Spraying water-absorbing polymer particles over the entire area.
(E) In the non-application area between the areas where the adhesive is applied to the base sheet in which the particles of the water-absorbing polymer are dispersed on each surface, while being conveyed along the conveyance direction, A process of producing an absorbent body by making cuts along the transport direction to obtain a plurality of narrow elongated base portions.
Hereinafter, each process will be described.

First, prior to the execution of the step (a), the inside of the vacuum box 145 is made negative by operating the exhaust device connected thereto. The same applies to the vacuum box of the vacuum conveyor disposed at a position facing the device in which the second adhesive application unit 140 and the second water-absorbing polymer spray unit 150 are integrated. 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. And the base material sheet 20 is let out from the original fabric roll of the strip | belt-shaped base material sheet 20 with the drive roll 151. FIG.
In the step (a), the adhesive 5 is applied to the surface of one surface of the base sheet 20 fed out from the raw fabric roll at a plurality of locations separated in the lateral direction by the first adhesive application unit 120. . While the base sheet 20 is being transported by the vacuum conveyor 141 and positioned on the vacuum box 145, the coating head 121 of the first adhesive coating unit 120 applies the surface of one surface of the base sheet 20 to the surface. Except for the non-cut portion NTb, the adhesive 5 is intermittently applied along the transport direction Y1.
At this time, it is important to apply the adhesive 5 to a plurality of locations spaced in the lateral direction X. By adopting such a coating form, the absorbent body 1 allows the water-absorbing polymer particles 3 to extend beyond the side edge portion 2s of the long base portion 2 in any state before and after absorbing the liquid. It does not protrude in the lateral direction X. The dispersed water-absorbing polymer particles 3 are securely fixed to the long base portion 2 via an adhesive 5 applied to the surface of one surface of the long base portion 2.
In order to carry out the step (a), the adhesive 5 can be applied to the surface of one surface of the base sheet 20 conveyed in one direction from a plurality of locations spaced in the lateral direction X. The coating head 121 having the above may be used.

In the step (b) subsequent to the step (b), the first water absorbing property is applied to the surface of one surface of the base sheet 20 on which the adhesive 5 is applied by the first adhesive application unit 120. The polymer spraying unit 130 sprays the water-absorbing polymer particles 3 over the entire region in the lateral direction X. While the base material sheet 20 is conveyed by the vacuum conveyor 141 and is located on the vacuum box 145, the water absorbent polymer particles 3 are formed on the surface of one surface along the conveyance direction Y1 by the first water absorbent polymer spraying unit 130. Is sprayed. However, the water-absorbing polymer particles 3 are not sprayed on the non-cut portion NTb.
In this way, by absorbing the water-absorbing polymer particles 3, the water-absorbing polymer particles 3 are fixed to the surface of one surface (upper surface) of the long base portion 2 via the adhesive 5. A plurality of 4 are formed. The plurality of absorptive units 4 formed in this way are arranged so that each longitudinal direction Y faces the transport direction (Y1 direction), and forms the precursor 1b of the absorber 1. .

  Next, after the elongate base portion 2 is turned upside down by the reverse roll 148, the same process as in the above-described steps (a) and (b) is performed on the other surface of the elongate base portion 2. Processes (c) and (d) are performed. At this time, in the process (c), the adhesive 5 is sprayed on the part corresponding to the part where the adhesive 5 is sprayed in the process (a) with the elongated base portion 2 interposed therebetween.

  Next, in the step (e), the base sheet 20 in which the water-absorbing polymer particles 3 are dispersed on each surface is received by the plurality of cutter blades 111a of the rotary die 111b in the cutting device 113 of the base sheet cutting section 110. A plurality of narrow base portions 2 that are supplied between the rolls 112 and cut along the transport direction Y1, and particles of the water-absorbing polymer fixed to the surface of the long base portions 2 A plurality of absorbent units 4 having 3 are obtained. The location where the cut is made is a non-application location between locations where the adhesive 5 is applied in a state where the base sheet 20 is conveyed along the conveyance direction Y1. In each of the absorbent units 4 thus obtained, the water-absorbing polymer particles 3 are fixed along the longitudinal direction Y at the position of the central region in the lateral direction X. In this way, a plurality of absorbent units 4 in which the water-absorbing polymer particles 3 are fixed only to the surface of one surface of the elongated base portion 2 are formed. The plurality of absorptive units 4 formed in this way are arranged so that each longitudinal direction Y faces the transport direction Y1, and forms a precursor 1b of the absorber 1.

  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 each in a direction X <b> 1 orthogonal to the conveyance direction (Y <b> 1 direction) of the belt-shaped base sheet 20. Are arranged side by side, the strip-shaped base sheet 20 is cut along the transport direction Y1 of the base sheet 20 and cut at a plurality of locations in the orthogonal direction X1 to form a plurality of absorbent units 4 To do. Further, the portion cut by the cutter blade 111 a becomes the side edge 2 s of the absorbent unit 4.

  Moreover, in this embodiment, since the some cutter blade 111a has the recessed part 114, respectively, the part for the length of the vertical direction Y of the absorptive unit 4 is given to the strip | belt-shaped base material sheet 20 conveyed. The non-cut portion NTb corresponding to the length twice as long as the length in the longitudinal direction Y of the non-slit region NT is intermittently formed. The plurality of absorptive units 4 formed in the cutting step are formed in parallel with the transport direction Y1, and are arranged in parallel in the orthogonal direction X1.

  Next, the precursor 1b of the absorbent body 1 is transported downstream by the drive roll 152, and the precursor 1b is lengthened in the transport direction Y1 of the non-cut portion NTb using a known cutting device (not shown). Cut into two equal positions. Thereby, the absorber 1 which has the non-slit area | region NT extended along the horizontal direction X in the both ends of the vertical direction Y is manufactured continuously. Thus, according to this manufacturing apparatus 100 and this manufacturing method using the same, the absorber 1 can be manufactured stably and efficiently. Thereafter, according to a known process, the top sheet is disposed on one surface side of the absorbent body 1, the back sheet is disposed on the other surface side, and other members are disposed as necessary. An absorbent article is obtained.

As a modified example of the manufacturing method including the steps (a) to (e), a method having the following steps (a ′) to (e ′) may be employed.
(I ') The process of apply | coating an adhesive over the whole area of the horizontal direction on the surface of one surface of the hydrophilic base material sheet conveyed in one direction.
(B ′) Under the condition that the base sheet coated with the adhesive is transported along the transport direction, the surface of the one surface of the base sheet coated with the adhesive is A step of spraying water-absorbing polymer particles in a plurality of locations at a distance in the lateral direction.
(C ') Under the condition that the base sheet in which water-absorbing polymer particles are dispersed on the surface of the one surface is transported along the transport direction, on the surface of the other surface of the base sheet, The process of applying an adhesive over the entire area in the lateral direction.
(D ') Under the state where the elongated base portion coated with the adhesive is transported along the transport direction, on the surface of the other surface where the adhesive is coated on the base sheet, Step of spraying water-absorbing polymer particles to a plurality of locations spaced in the lateral direction (e) transporting along the transport direction to the base sheet in which the water-absorbing polymer particles are sprayed on each surface In the non-sprayed portion between the sprayed portions of the water-absorbing polymer particles, a slit is cut along the transport direction to obtain a plurality of narrow elongated base portions and absorb The process of manufacturing the body.

  In the step (a ′), the adhesive 5 is applied to the entire surface of the base sheet 20 in the lateral direction X on the surface of one surface of the base sheet 20 by the first adhesive application unit 120. While the base sheet 20 is being transported by the vacuum conveyor 141 and positioned on the vacuum box 145, the coating head 121 of the first adhesive coating unit 120 applies the surface of one surface of the base sheet 20 to the surface. Except for the non-cut portion NTb, the adhesive 5 is intermittently applied along the transport direction Y1.

In the step (b ′) subsequent to the step (b ′), the first surface of the surface of the base sheet 20 on which the adhesive 5 is applied by the first adhesive application unit 120 is applied to the first surface. The water-absorbing polymer spraying unit 130 sprays the water-absorbing polymer particles 3 to a plurality of locations at a distance in the lateral direction. While the base material sheet 20 is conveyed by the vacuum conveyor 141 and is located on the vacuum box 145, the water absorbent polymer particles 3 are formed on the surface of one surface along the conveyance direction Y1 by the first water absorbent polymer spraying unit 130. Is sprayed. However, the water-absorbing polymer particles 3 are not sprayed on the non-cut portion NTb.
At this time, it is important to disperse the water-absorbing polymer particles 3 at a plurality of locations spaced in the lateral direction X on the surface of the base sheet 20 on which the adhesive 5 is applied. By adopting such a spraying form, the absorbent body 1 allows the water-absorbing polymer particles 3 to exceed the side edge 2s of the long base portion 2 in any state before and after absorbing the liquid. It does not protrude in the lateral direction X. The dispersed water-absorbing polymer particles 3 are securely fixed to the surface of one surface of the long base portion 2 via the adhesive 5 applied to the surface of one surface of the long base portion 2. The
In order to perform the step (b '), the water-absorbing polymer particles 3 may be applied to one surface of the base sheet 20 conveyed in one direction from a plurality of locations spaced in the lateral direction X. What is necessary is just to use the water absorbing polymer spreading | diffusion part 130 which has a possible structure.

  Next, after the elongate base portion 2 is turned upside down by the reverse roll 148, the above-described steps (a ′) and (b ′) are performed on the surface of the other side of the elongate base portion 2. The same steps (c ') and (d') are performed. In the step (d '), the water-absorbing polymer 3 is sprayed on the part corresponding to the part where the particles 3 of the water-absorbing polymer are sprayed in the step (b) with the elongated base portion 2 interposed therebetween.

  Next, in the step (e), the base sheet 20 on which the water-absorbing polymer particles 3 are dispersed is cut along the transport direction Y1 to form a plurality of narrow elongated base portions 2 and the A plurality of absorptive units 4 having water-absorbing polymer particles 3 fixed to the elongated base 2 are obtained. The places where the cuts are made are non-sprayed places between the places where the water-absorbing polymer particles 3 are sprinkled in a state where the base sheet 20 is transported along the transport direction Y1. In each of the absorbent units 4 thus obtained, the water-absorbing polymer particles 3 are fixed along the longitudinal direction Y at the position of the central region in the lateral direction X. Thus, a plurality of absorptive units 4 in which the water-absorbing polymer particles 3 are fixed to each surface of the elongated base portion 2 are formed. The plurality of absorptive units 4 formed in this way are arranged so that each longitudinal direction Y faces the transport direction Y1, and forms a precursor 1b of the absorber 1. Thereafter, the same procedure as the method using the manufacturing apparatus shown in FIG. 4 is performed, and the absorbent body 1 and the absorbent article 10 are obtained.

  FIG. 6 shows a manufacturing method using another manufacturing apparatus 100. In the manufacturing method described so far, first, after applying the adhesive 5 and spraying the water-absorbing polymer particles 3 on the surface of each surface of the base sheet 20, the base sheet 20 is moved in the transport direction Y1. In the manufacturing method according to the present embodiment, first, a plurality of slits along the conveying direction Y1 are first cut into the base sheet 20 to form a plurality of narrow long base portions 2. After being obtained, the adhesive 5 is applied and the water-absorbing polymer particles 3 are sprayed on the surface of each surface of the elongated base portion 2. This manufacturing method will be described in detail below. In addition, regarding the manufacturing apparatus 100 shown in FIG. 6 and a manufacturing method using the same, the description described above regarding the manufacturing apparatus 100 shown in FIG.

The manufacturing apparatus 100 shown in FIG. 6 has a base sheet cut part 110, a first adhesive application part 120, a first water-absorbing polymer spray part 130, and a second adhesive application from the upstream side to the downstream side of the manufacturing process. The part 140 and the second water-absorbing polymer spraying part 150 are provided in this order. The structure of each part 110,120,130,140,150 is the same as that of the manufacturing apparatus shown in FIG. A method for manufacturing an absorbent article including the absorbent body 1 using the manufacturing apparatus 100 will be described below. This manufacturing method includes the following steps.
(F) A step of cutting a plurality of strips along the transport direction into a base material sheet transported in one direction to obtain a plurality of narrow elongated base portions.
(G) Apply the adhesive only to the central region in the lateral direction of the surface of one surface of each long base portion in a state where the plurality of long base portions are transported along the transport direction. Process.
(H) The adhesive on each long base portion is applied in a state where the long base portion coated with the adhesive on the surface of the one surface is transported along the transport direction. And spraying water-absorbing polymer particles over the entire area in the lateral direction of the surface of the one surface.
(Li) Applying an adhesive only to the central region in the lateral direction of the surface of the other surface of each long base portion in a state where a plurality of the long base portions are transported along the transport direction Process.
(Nu) The adhesive on each long base portion is applied in a state where the long base portion coated with the adhesive on the surface of the other surface is transported along the transport direction. A step of producing an absorbent body by spraying water-absorbing polymer particles over the entire region in the lateral direction of the surface of the other surface.
Hereinafter, each process will be described.

  In the step (f), the base sheet 20 fed out from the raw roll of the strip-shaped base sheet 20 by the driving roll 151 is received with a plurality of cutter blades 111a in the cutting device 113 of the base sheet cut section 110. It supplies between the rolls 112, cuts the strip | belt-shaped base material sheet 20, and forms the several elongate base | substrate part 2. As shown in FIG. 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.

  In the present manufacturing method, since the rotary die 111b has the concave portion 114, the length of the long base portion 2 in the longitudinal direction Y is spaced apart from the belt-like base material sheet 20 to be conveyed intermittently. In addition, a non-cut portion NTb corresponding to a length twice as long as the length in the vertical direction Y of the non-slit region NT is formed. The plurality of long base portions 2 formed in the step (f) are formed in parallel to the transport direction Y1, and are arranged in parallel in the orthogonal direction X1.

  Next, in the step (g), the first adhesive application unit 120 applies the adhesive 5 only to the central region in the lateral direction of the surface of one surface of the plurality of long base portions 2. While the plurality of long base portions 2 are transported by the vacuum conveyor 141 and positioned on the vacuum box 145, the plurality of long base portions 2 are juxtaposed in the orthogonal direction X1 by the application head 121 of the first adhesive application unit 120. The adhesive 5 is intermittently applied along the transport direction Y1 only in the central region of the surface of one surface of the long base portion 2 except for the non-cut portion NTb. In order to perform the step (g), the adhesive 5 can be applied to the surface of one surface of the base sheet 20 conveyed in one direction from a plurality of locations spaced in the lateral direction X. The coating head 121 having the above may be used.

  In the step (h) subsequent to the step (g), the side of the surface of one surface of the plurality of long base portions 2 to which the adhesive 5 is applied by the first adhesive application portion 120 is arranged. The water-absorbing polymer 3 is sprayed by the first water-absorbing polymer spraying unit 130 over the entire direction. The long base portion 2 is conveyed by the vacuum conveyor 141, and is positioned on the vacuum box 145, and on the surface of one surface, the first water-absorbing polymer is formed on the entire surface in the lateral direction X along the conveyance direction Y1. The water-absorbing polymer particles 3 are sprayed by the spraying unit 130. However, the water-absorbing polymer particles 3 are not sprayed on the non-cut portion NTb. The dispersed water-absorbing polymer particles 3 are securely fixed to the long base portion 2 via the adhesive 5 applied only to the central region of one surface of the plurality of long base portions 2. The

  Next, after the elongate base portion 2 is turned upside down by the reverse roll 148, the surface of the other surface of the elongate base portion 2 is similar to the above-described steps (G) and (H). Processes (Li) and (N) are performed. Thus, a plurality of absorptive units 4 are formed in which the water-absorbing polymer particles 3 are fixed on the surface of each surface of the elongated base portion 2. The plurality of absorptive units 4 formed in this way are arranged so that each longitudinal direction Y faces the transport direction Y1, and forms a precursor 1b of the absorber 1.

  Next, the precursor 1b of the absorbent body 1 is transported downstream by the drive roll 152, and the precursor 1b is lengthened in the transport direction Y1 of the non-cut portion NTb using a known cutting device (not shown). Cut into two equal positions. Thereby, the absorber 1 which has the non-slit area | region NT extended along the horizontal direction X in the both ends of the vertical direction Y is manufactured continuously. Thus, according to this manufacturing apparatus 100 and this manufacturing method using the same, the absorber 1 can be manufactured stably and efficiently. Thereafter, according to a known process, the top sheet is disposed on one surface side of the absorbent body 1 where the water-absorbing polymer particles 3 are fixed, and on the other surface side where the water-absorbing polymer particles 3 are not fixed. By disposing the back sheet and further disposing other members as necessary, the intended absorbent article can be obtained.

As a modified example of the manufacturing method including the steps (f) to (nu), a method in which the steps (to) to (nu) are replaced with the following steps (to ') to (nu'). It can also be adopted.
(G ') An adhesive is applied over the entire region in the lateral direction of the surface of one surface of each elongated substrate portion in a state where a plurality of the elongated substrate portions are conveyed along the conveyance direction. Process.
(H ') The adhesive on each long base portion is applied in a state where the long base portion coated with the adhesive on the surface of the one surface is transported along the transport direction. The step of spraying water-absorbing polymer particles only in the lateral central region of the applied surfaces.
(Li ') Applying an adhesive over the entire region in the lateral direction of the surface of the other surface of each elongated substrate portion in a state where the plurality of elongated substrate portions are conveyed along the conveyance direction. Process.
(Nu ') The adhesive in each long base portion was applied in a state where the long base portion coated with the adhesive on the other surface was transported along the transport direction. A step of producing an absorbent body by spraying water-absorbing polymer particles only in the lateral central region of the surface of the other surface.

  In the manufacturing method including the steps (f), (g ′), (h ′), (li ′) and (nu ′), the step (h ′) is carried in one direction. What is necessary is just to use the water-absorbing polymer dispersion | distribution part 130 which has a structure which can apply | coat the water-absorbing polymer particle | grains 3 from the several places spaced apart in the horizontal direction X to the surface of the one surface of the base material sheet 20. FIG. Similarly, in order to perform the step (nu ′), the water-absorbing polymer particles 3 are placed on the surface of the other surface of the base sheet 20 conveyed in one direction from a plurality of positions spaced in the lateral direction X. What is necessary is just to use the water absorbing polymer spreading | diffusion part 130 which has a structure which can be apply | coated.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, the range of this invention is not restrict | limited to the said embodiment. For example, the absorbent body 1 in the absorbent article 10 of the above embodiment is formed by using a plurality of absorbent units 4 having the long base portion 2 with a uniform width. The width of the portion 2 may be non-uniform.

  Moreover, although the absorber 1 shown in FIG. 2 mentioned above is arranged and formed so that the longitudinal direction Y of each of the plurality of absorbent units 4 faces the longitudinal direction Y of the absorber 1, instead of this, For example, as shown in FIG. 7, the plurality of absorbent units 4 may be arranged so that the longitudinal direction Y of each of the absorbent units 4 faces the lateral direction X of the absorbent body 1. The absorber 1 shown in FIG. 7 includes non-slit regions NT on both sides along the vertical direction Y. The absorbent body 1 shown in FIG. 7 uses a cut roll in which cut knives arranged parallel to the axial direction of the base roll are intermittently arranged in the circumferential direction and a receiving roll. It can manufacture by supplying the base material sheet 20 between.

  Further, the absorbent body 1 may be one in which the absorbent units 4 are arranged so that the longitudinal direction Y of the absorbent units 4 faces a plurality of directions. The absorbent body 1 in which the absorbent units 4 are arranged so as to face a plurality of directions is formed, for example, by arranging so that the longitudinal direction Y of each of the plurality of absorbent units 4 faces the longitudinal direction Y of the absorbent body 1. Are formed on both sides along the longitudinal direction Y of the absorbent body 1 and arranged so that the longitudinal direction Y of each of the plurality of absorbent units 4 faces the lateral direction X of the absorbent body 1. The form etc. which have an area | region in the center part pinched | interposed by the said both sides are mentioned. The absorbent body 1 in which the absorptive units 4 are arranged so as to face in such a plurality of directions, for example, using the score cut knife 111 and the receiving roll 112 shown in FIG. A plurality of cuts along the conveying direction Y1 are made on both sides along the direction Y1, and then the substrate sheet 20 to be conveyed using cut rolls and receiving rolls arranged intermittently in the circumferential direction. It can be formed by making a plurality of notches along the direction X1 at the center of the direction X1 orthogonal to the transport direction.

  Further, in the absorbent body 1 in the absorbent article 10 of the above-described embodiment, each absorbent unit 4 and each long base portion 2 extend in a straight line substantially parallel to the vertical direction Y direction. The absorptive unit 4 and the elongate base portion 2 may extend so as to draw a waveform curve along the vertical direction Y, or may extend in a mountain-like zigzag shape along the vertical direction Y. .

  Furthermore, in the manufacturing method of the absorbent article 10 described above, instead of fixing the water-absorbing polymer particles 3 with the adhesive 5, the surface of one surface of the long base portion 2 is subjected to napping, and napping is performed. In the case of fixing the water-absorbing polymer particles 3 between the fibers, a raising process may be performed instead of the adhesive application process described above. Examples of the method for raising the brush include the methods described in JP2012-092476A and JP2013-028891A.

This invention discloses the following absorbent articles further regarding embodiment mentioned above.
<1>
Absorption comprising a long base portion having a horizontal direction, a vertical direction longer than the horizontal direction, and a thickness direction, and water-absorbing polymer particles fixed to the surface of the long base portion A plurality of sexual units, and each absorbent unit is provided with an absorbent body in which the longitudinal direction is oriented in at least one direction,
The water-absorbing polymer particles are fixed to the surfaces of both the skin-facing surface and the non-skin-facing surface of the long base portion,
Before the water-absorbing polymer particles absorb the liquid, the water-absorbing polymer particles do not protrude laterally beyond the side edges along the longitudinal direction of the elongated substrate portion, and Even after the water-absorbing polymer particles absorb the liquid, the water-absorbing polymer particles do not swell beyond the side edges along the longitudinal direction of the elongated base portion. Goods.

<2>
Of the absorbent body, in the part where the absorbent unit is formed, the absorbent unit is another member adjacent to the absorbent unit on the skin facing surface side or another member adjacent to the non-skin facing surface side. The absorbent article according to <1>, wherein the absorbent article is in a non-joined state with the member.
<3>
The absorbent body has a longitudinal end region thereof joined to another member adjacent to the absorber on the skin facing surface side or another member adjacent to the non-skin facing surface side <1. > Or <2>.
<4>
The absorbent article according to any one of <1> to <3>, wherein the absorbent body includes a non-slit region in which the elongated base portion is not disposed in an end region in the vertical direction. .
<5>
The absorbent article according to any one of <1> to <4>, wherein the absorbent body is not provided with particles of the water-absorbing polymer in a longitudinal end region thereof.
<6>
The absorbent article according to any one of <1> to <5>, wherein the long base portion is made of a hydrophobic sheet.

<7>
Among the water-absorbing polymers fixed to the long base portion, the basis weight of the water-absorbing polymer fixed to the skin-facing surface side of the long base portion is larger than the basis weight of the long base portion. The absorbent article according to any one of <1> to <6>, wherein the basis weight of the water-absorbing polymer fixed to the non-skin facing surface side is higher.
<8>
The water-absorbing polymer fixed on the skin-facing surface side in the long base portion and the water-absorbing polymer fixed on the non-skin facing surface side in the long base portion are different from each other, The absorbent article as described in any one of <1> thru | or <7>.
<9>
The absorptive unit has a length Lx in the lateral direction X of preferably about 0.3 mm to 10 mm, more preferably about 0.6 mm to 2.0 mm, and still more preferably about 0.6 mm to 1.8 mm. The absorbent article according to any one of <1> to <8>, which is a product.
<10>
The length Ly in the longitudinal direction Y of the absorbent unit is preferably not less than 2 times and not more than 3500 times, more preferably not less than 100 times and not more than 700 times the length Lx in the transverse direction X <1> to The absorbent article as described in any one of <9>.
<11>
The absorbent article according to any one of <1> to <10>, wherein the length Y of the absorbent unit in the longitudinal direction Y is preferably 20 mm to 1000 mm, more preferably 200 mm to 400 mm.

<12>
In the plan view of the absorber, the ratio of the area of the absorption region AT to the entire area of the absorber is preferably 20% or more, more preferably 50% or more, and 100% or less. The absorbent article according to any one of <1> to <11>, preferably 90% or less.
<13>
The absorbent article according to any one of <1> to <12>, wherein an absorbent unit is disposed in the entire region between both end portions in the longitudinal direction Y of the absorbent body.
<14>
When arranging the longitudinal direction Y of the absorbent unit so as to face the longitudinal direction Y of the absorbent body, it is preferable that 3 or more absorbent units are disposed per absorbent body, and 50 or more absorbent units are disposed. The absorbent article according to any one of <1> to <13>, wherein the absorbent article is more preferably arranged, and preferably 1000 or less, more preferably 500 or less. .
<15>
<1> to <14> according to any one of <1> to <14>, wherein the water-absorbing polymer particles are absent or the water-absorbing polymer particles 3 are not fixed on the side surface of the elongated base portion. Absorbent article.
<16>
Any one of the above items <1> to <15>, in which a gap S is generated between adjacent absorbent units along the lateral direction X in a state before the water-absorbing polymer particles absorb the liquid. Absorbent articles.

<17>
The degree of the gap S is preferably 0.1 mm or more, more preferably 0.5 mm or more, and preferably 5 mm or less, more preferably 3 mm or less. The absorbent article as described.
<18>
In the absorber, the ratio of the width W2 of the elongated base portion to the width W1 of the absorber is preferably 0.001 or more, more preferably 0.002 or more, and 0.200 or less. The absorbent article according to any one of <1> to <17>, which is preferably 0.040 or less.
<19>
The width W2 of the elongated base portion is preferably 0.3 mm or more, more preferably 0.6 mm or more, and preferably 10 mm or less, more preferably 2.0 mm or less. The absorbent article according to any one of <1> to <18>, preferably 1.8 mm or less.
<20>
With respect to the water-absorbing polymer fixed on the skin-facing surface side of the long base portion, the liquid passing rate under pressure at 2.0 kPa is preferably 20 ml / min or more, and preferably 40 ml / min or more. More preferably, the absorbent article according to any one of the above items <1> to <19>, which is preferably 1000 ml / min or less, and more preferably 800 ml / min or less.
<21>
Regarding the water-absorbing polymer fixed on the non-skin facing surface side in the long base portion, the liquid passing rate under pressure at 2.0 kPa is preferably 0 ml / min or more, and preferably 10 ml / min or more. The absorbent article according to any one of <1> to <20>, further preferably 400 ml / min or less, and more preferably 200 ml / min or less.

<22>
Regarding the water-absorbing polymer fixed on the skin-facing surface side of the long base portion, the centrifugal retention amount is preferably 20 g / g or more, more preferably 25 g / g or more, and 50 g / g. The absorbent article according to any one of <1> to <21>, preferably g or less, and more preferably 45 g / g or less.
<23>
Regarding the water-absorbing polymer fixed to the non-skin facing surface side in the long base portion, the centrifugal retention amount is preferably 25 g / g or more, more preferably 30 g / g or more, and 65 g. The absorbent article according to any one of <1> to <22>, which is preferably / g or less, and more preferably 55 g / g or less.
<24>
When the basis weight of the water absorbent polymer fixed on the non-skin facing surface side is higher than the skin facing surface side, the non-skin facing surface side with respect to the basis weight B1 of the water absorbent polymer fixed on the skin facing surface side The value of B2 / B1, which is the ratio of the basis weight B2 of the water-absorbing polymer fixed to 1, is preferably 1.05 or more, more preferably 1.7 or more, and 40 or less. The absorbent article according to any one of <1> to <23>, preferably 10 or less.
<25>
The average particle diameter d1 of the water-absorbing polymer particles in the state before absorbing the liquid is preferably 20 μm or more, more preferably 200 μm or more, and preferably 3000 μm or less, and 2000 μm or less. More preferably, the absorbent article according to any one of <1> to <24>.
<26>
The average particle diameter d2 of the swelled water-absorbing polymer particles that have absorbed the liquid 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, the absorbent article according to any one of <1> to <25>.

<27>
The relationship between the width W2 of the long base portion and the average particle diameter d1 of the water-absorbing polymer particles before absorbing the liquid is preferably such that the value of d1 / W2 is 0.002 or more. The absorbent article according to any one of <1> to <27>, more preferably 100 or more, preferably 0.900 or less, and more preferably 0.800 or less.
<28>
The relationship between the width W2 of the long base portion and the average particle diameter d2 of the water-absorbing polymer particles after absorbing the liquid is preferably such that the value of d2 / W2 is 0.02 or more. The absorbent article according to any one of <1> to <28>, more preferably .45 or more, further preferably 0.90 or less, and further preferably 0.80 or less.
<29>
On the surface of one surface of the base sheet of the long base portion conveyed in one direction, an adhesive is applied to a plurality of locations separated in the lateral direction,
The base sheet of the long base portion with the adhesive applied to the surface of the one surface is transported along the transport direction in the base sheet of the long base portion. On the surface of the one surface to which the adhesive is applied, the particles of the water-absorbing polymer are dispersed over the entire region in the lateral direction,
The base sheet of the long base portion was transported along the transport direction, and a distance in the lateral direction was separated from the surface of the other surface of the base sheet of the long base portion. Apply adhesive to multiple locations,
The base sheet of the long base portion with the adhesive applied to the surface of the other surface is transported along the transport direction in the base sheet of the long base portion. Sprinkling water-absorbing polymer particles over the entire area in the lateral direction on the surface of the other surface to which the adhesive is applied,
The non-application part between the places where this adhesive was applied to the base sheet of the long base part in which particles of the water-absorbing polymer were dispersed on each surface, while being conveyed along the conveyance direction The manufacturing method of an absorbent article including the process of making an incision along this conveyance direction, obtaining the elongate base | substrate part of a multiple narrow strip | line, and manufacturing an absorber.
<30>
On the surface of one surface of the base sheet of the hydrophilic long base portion conveyed in one direction, an adhesive is applied over the entire area in the lateral direction,
The base sheet of the long base portion with the adhesive applied to the surface of the one surface is transported along the transport direction in the base sheet of the long base portion. The particles of the water-absorbing polymer are dispersed in a plurality of locations at a distance in the lateral direction of the surface of the one surface to which the adhesive is applied,
An adhesive is applied to the entire surface in the lateral direction on the surface of the other surface of the base sheet of the long base portion in a state where the base sheet of the long base portion is transported along the transport direction. Apply
The base sheet of the long base portion with the adhesive applied to the surface of the other surface is transported along the transport direction in the base sheet of the long base portion. Scattering water-absorbing polymer particles at a plurality of locations spaced in the lateral direction of the surface of the other surface to which the adhesive is applied,
In a state in which the water-absorbing polymer particles are dispersed on each surface, the base sheet of the elongated base portion on which the water-absorbing polymer particles are dispersed is conveyed along the conveying direction. The manufacturing method of an absorbent article including the process which cut | incises along a conveyance direction in a non-sprinkling location, obtains the elongate base part of several narrow strips, and manufactures an absorber.
<31>
Into the base sheet of the long base portion transported in one direction, a plurality of notches along the transport direction are put, to obtain a plurality of narrow long base portions,
Applying the adhesive only to the central region in the lateral direction of the surface of one surface of each long base portion under the condition where the plurality of long base portions are transported along the transport direction,
In the state where the long base portion coated with the adhesive on the surface of the one surface is transported along the transport direction, the one coated with the adhesive on each long base portion. Spray the particles of water-absorbing polymer over the entire lateral area of the surface of
Applying an adhesive only to the lateral central region of the surface of the other surface of each long base portion under a state where the plurality of long base portions are transported along the transport direction,
The other base coated with the adhesive on each long base portion in a state where the long base portion coated with the adhesive on the surface of the other surface is transported along the transport direction. The manufacturing method of an absorbent article including the process of sprinkling the particle | grains of a water absorbing polymer over the whole region of the surface of the surface of this surface, and manufacturing an absorber.
<32>
Into the base sheet of the long base portion transported in one direction, a plurality of notches along the transport direction are put, to obtain a plurality of narrow long base portions,
Applying an adhesive over the entire region in the lateral direction of the surface of one surface of each long base portion under a state where the plurality of long base portions are transported along the transport direction,
In the state where the long base portion coated with the adhesive on the surface of the one surface is transported along the transport direction, the one coated with the adhesive on each long base portion. Scatter the water-absorbing polymer particles only in the lateral central region of the surface of
Applying an adhesive over the entire region in the lateral direction of the surface of the other surface of each long base portion under the condition where the plurality of long base portions are transported along the transport direction,
The other base coated with the adhesive on each long base portion in a state where the long base portion coated with the adhesive on the surface of the other surface is transported along the transport direction. The manufacturing method of an absorbent article including the process of spraying the particle | grains of a water-absorbing polymer only to the center area | region of the horizontal direction of the surface of this surface, and manufacturing an absorber.

DESCRIPTION OF SYMBOLS 1 Absorbent body 2 Long base part 2s Side edge part 20 Base material sheet 3 Water absorbing polymer (particles of water absorbing polymer)
4 Absorbing unit 5 Adhesive 10 Absorbent article 11 Top sheet 12 Back sheet

Claims (9)

Absorption comprising a long base portion having a horizontal direction, a vertical direction longer than the horizontal direction, and a thickness direction, and water-absorbing polymer particles fixed to the surface of the long base portion A plurality of sexual units, and each absorbent unit is provided with an absorbent body in which the longitudinal direction is oriented in at least one direction,
The water-absorbing polymer particles are fixed to the surfaces of both the skin-facing surface and the non-skin-facing surface of the long base portion,
Before the water-absorbing polymer particles absorb the liquid, the water-absorbing polymer particles do not protrude laterally beyond the side edges along the longitudinal direction of the elongated substrate portion, and Even after the water-absorbing polymer particles absorb the liquid, the water-absorbing polymer particles do not swell beyond the side edges along the longitudinal direction of the elongated base portion. Goods.   Of the absorbent body, in the part where the absorbent unit is formed, the absorbent unit is another member adjacent to the absorbent unit on the skin facing surface side or another member adjacent to the non-skin facing surface side. The absorbent article according to claim 1, which is in a non-bonded state with the member.   The longitudinal direction end region of the absorber is in a joined state with another member adjacent to the absorber on the skin facing surface side or another member adjacent to the non-skin facing surface side. Or the absorbent article of 2.   The absorbent article according to any one of claims 1 to 3, wherein the absorbent body includes a non-slit region in which the elongated base portion is not disposed in an end region in the vertical direction.   The absorbent article according to any one of claims 1 to 4, wherein the absorbent body is not provided with particles of the water-absorbing polymer in an end region in a longitudinal direction thereof.   The absorptive article according to any one of claims 1 to 6 in which said long base part consists of a hydrophobic sheet.   Among the water-absorbing polymers fixed to the long base portion, the basis weight of the water-absorbing polymer fixed to the skin-facing surface side of the long base portion is larger than the basis weight of the long base portion. The absorbent article according to any one of claims 1 to 7, wherein the basis weight of the water-absorbing polymer fixed on the non-skin facing surface side is higher.   Different types of water-absorbing polymer particles fixed on the skin-facing surface side of the long base portion and water-absorbing polymer particles fixed on the non-skin facing surface side of the long base portion The absorbent article according to any one of claims 1 to 8. On the surface of one surface of the base sheet of the long base portion conveyed in one direction, an adhesive is applied to a plurality of locations separated in the lateral direction,
The base sheet of the long base portion with the adhesive applied to the surface of the one surface is transported along the transport direction in the base sheet of the long base portion. On the surface of the one surface to which the adhesive is applied, the particles of the water-absorbing polymer are dispersed over the entire region in the lateral direction,
The base sheet of the long base portion was transported along the transport direction, and a distance in the lateral direction was separated from the surface of the other surface of the base sheet of the long base portion. Apply adhesive to multiple locations,
The base sheet of the long base portion with the adhesive applied to the surface of the other surface is transported along the transport direction in the base sheet of the long base portion. Sprinkling water-absorbing polymer particles over the entire area in the lateral direction on the surface of the other surface to which the adhesive is applied,
The non-application part between the places where this adhesive was applied to the base sheet of the long base part in which particles of the water-absorbing polymer were dispersed on each surface, while being conveyed along the conveyance direction The manufacturing method of an absorbent article including the process of making an incision along this conveyance direction, obtaining the elongate base | substrate part of a multiple narrow strip | line, and manufacturing an absorber.

Images