JP4553700B2 - Absorbent article and manufacturing method of absorbent body - Google Patents

Description

  The present invention relates to absorbent articles such as disposable diapers, sanitary napkins, urine pads, and incontinence pads, and methods for producing absorbent bodies applicable to these absorbent articles.

  Absorbent articles such as disposable diapers, sanitary napkins, urine pads, and incontinence pads are generally provided with an absorbent such as a body fluid between a top sheet and a back sheet. In addition, this absorber is made by wrapping an absorbent material made of cotton-like pulp or synthetic pulp with crepe paper, and the absorbent material is mixed with the absorbent material in order to improve the absorbent capacity. ing.

  In manufacturing this type of absorbent body, first, if necessary, the pulp is defibrated or the like. Next, an absorptive polymer is mixed in the defibrated pulp and formed into an appropriate size. Then, the molded absorbent material is laminated on the crepe paper, and both side portions of the crepe paper are folded back so as to wrap around both side ends of the absorbent material. Thus, an absorbent body obtained by wrapping the absorbent material mixed with the absorbent polymer with the crepe paper is obtained.

On the other hand, in order to increase the absorption speed of the absorbent article, the present inventors preferably use a fiber assembly made of tow instead of pulp or defibrated pulp as an absorbent. I found out. However, the absorbent article in which the absorbent material is a fiber assembly made of tow has the following problems.
That is, a fiber assembly made of tow has a high porosity and a high absorption speed. However, since the porosity is high, the absorbent polymer falls off on the crepe paper when mixed or worn. And since the crepe paper is a thin paper, the presence of the absorbent polymer that has fallen out has been transmitted to the wearer with a sense of incongruity. Further, since the crepe paper does not have an action of holding the absorbent polymer, the absorbent polymer that has fallen out moves on the crepe paper, resulting in uneven distribution of the absorption capacity.

  The main problem to be solved by the present invention is to provide an absorbent article that does not give the user a sense of incongruity and does not cause uneven distribution of the absorbent capacity, and a method of manufacturing an absorbent body that is applied to the absorbent article.

The present invention that has solved this problem is as follows.
[Invention of Claim 1]
An absorbent article provided with an absorber in which an absorbent material mixed with an absorbent polymer is wrapped with crepe paper between a top sheet and a back sheet,
The absorbent material is a fiber assembly made of tow,
And the holding sheet which hold | maintains the absorptive polymer which slipped out from the said absorber is interposed between the said absorber back surface and the said crepe paper, The absorbent article characterized by the above-mentioned.

[Invention of Claim 2]
The absorbent article according to claim 1, wherein the holding sheet is a nonwoven fabric having a compression energy based on a KES test of 0.01 to 10.00 gfcm / cm ² and a compression resilience of 10 to 70%.

[Invention of Claim 3]
The absorbent article according to claim 1 or 2, wherein the constituent fiber of the fiber assembly made of tow is a fiber of cellulose acetate.

[Invention of Claim 4]
A method for producing an absorbent body in which an absorbent material mixed with an absorbent polymer is wrapped in crepe paper,
As the absorbent material, using a fiber assembly made of tow,
And after laminating | stacking in order of the said absorbent material, the holding sheet | seat which hold | maintains the absorbent polymer which came out from this absorbent material, and the said crepe paper, an absorbent polymer is sprayed on the said absorbent material, and the said crepe from the said absorbent material side The manufacturing method of the absorber characterized by flowing gas to the paper side.

  According to the present invention, there are provided an absorbent article that does not give the user a sense of incongruity and does not cause uneven distribution of the absorbent capacity, and an absorbent body manufacturing method applicable to the absorbent article.

Embodiments of the present invention will be described below.
[Use]
The absorbent article of the present invention can be applied to general articles that absorb body fluids such as urine and blood. Examples of this type of absorbent article include paper diapers, sanitary napkins, urine pads, and incontinence pads. Hereinafter, the present embodiment will be described by taking the case where the absorbent article is a paper diaper as an example.

[Structure of absorbent articles (paper diapers)]
As shown in a plan view in FIG. 1 and a cross-sectional view taken along the line II in FIG. 1, a paper diaper 50 according to the present embodiment includes a top sheet 51, a back sheet 54, and the sheets 51 and 54. It becomes mainly from the absorber 53 provided in between.

  Both sides of the surface sheet 51 are folded back and wrap around the both ends of the absorber 53, and the surfaces of the both sides of the surface sheet 51 are joined to the surface of the back sheet 54. The front sheet 51 and the back sheet 54 are joined to each other at the front and rear end portions where the absorber 53 is not interposed. The method for joining the top sheet 51 and the back sheet 54 is not particularly limited. For example, bonding can be appropriately performed by hot melt bonding, ultrasonic sealing, heat sealing (thermal fusion), heat press (thermocompression bonding), or a combination thereof.

  The back sheet 54 has the same shape as the planar outer shape of the paper diaper 50, and the front and rear end portions and both side portions thereof extend forward or rearward or sideward than the front and rear end edges or both side edges of the absorber 53. . The lateral extension of the back sheet 54 is particularly large at the front and rear end portions in the longitudinal direction (the vertical direction in FIG. 1 in FIG. 1). For example, a fastening tape or the like is attached to the greatly extended portion.

  The absorbent 53 includes an absorbent 52 mixed with an absorbent polymer (not shown), a crepe paper 57 that wraps the absorbent 52, and a holding sheet 60 interposed between the back surface of the absorbent 52 and the crepe paper 57, To become the main.

  The crepe paper 57 wraps (covers) the absorbent material 52 and the holding sheet 60 so that the shape retainability of the absorbent material 52 and the holding sheet 60 is achieved.

The absorbent material 52 is formed of a fiber assembly made of tow, and the absorption speed is improved. In particular, in this case, the flow direction of the fibers of the fiber assembly made of tow is preferably the longitudinal direction.
Since the fiber assembly made of tows is a long fiber, there is no possibility of being separated (divided) into two in the fiber flow direction. Therefore, when the fiber flow direction is the longitudinal direction, the absorbent in the center in the longitudinal direction, i.e., the leg periphery, is not likely to be in the state of the front and rear end portions due to the movement of the wearer, and side leakage occurs. There is no fear. Of course, since the front and rear end portions of the absorbent material 52 are held by the joining of the top sheet 51 and the back sheet 54, there is no possibility that the whole will move forward or backward integrally.

  In addition, the fiber assembly made of tow has a characteristic that body fluid easily diffuses in the fiber flow direction, but body fluid hardly diffuses in a direction orthogonal to the fiber flow direction. Therefore, when the fiber flow direction is the longitudinal direction, the body fluid diffuses rapidly in the longitudinal direction, and the entire surface of the absorber 53 is effectively utilized.

Furthermore, it is preferable that the absorbent material 52 has both end portions at a lower density than the central portion in the width direction. A fiber assembly made of tow has a characteristic that when the fiber density is low, the body fluid retention is excellent, and when the fiber density is high, the body fluid diffusibility is excellent. Therefore, when such a difference in density is provided, body fluid diffuses quickly in the central portion in the width direction of the absorbent material 52, and body fluid retention is improved at both end portions that do not require rapid diffusivity. Depending on each part, the most suitable characteristic is given. However, the fiber density at both side ends is preferably 10 to 100 g / m ³ , regardless of the difference between the fiber densities at the both ends and the widthwise center of the absorbent material 52. more preferably to 70 g / m ^3, particularly preferably in the 30 to 50 g / m ^3. If the fiber density at both ends is too low, the absorbent 52 may be warped in the width direction. On the other hand, if the fiber density at both end portions is too high, the wearer may feel uncomfortable.

  In the present absorbent body 53, the absorbent polymer that has fallen down (leaved out) from the absorbent material 52 is held by the holding sheet 60. Therefore, the absorbent polymer that has slipped out does not come into contact with the user only through the crepe paper 57, and there is no fear that it will be transmitted to the user as a sense of incongruity. Further, since the absorbent polymer that has slipped out is held by the holding sheet 60 and does not move on the crepe paper 57, there is no possibility of uneven absorption capacity. The material of the holding sheet 60 will be described later.

A second sheet 55 is interposed between the absorbent body 53 and the top sheet 51, and the instantaneous absorption speed of body fluid is improved. In this regard, if the absorbent material 52 is made of pulp, even if the body fluid is instantaneously absorbed by the second sheet 55, it will immediately overflow. However, in this embodiment, since the absorbent material 52 is formed of a fiber assembly made of tow, the body fluid absorbed by the second sheet 55 is immediately absorbed by the absorbent material 52, resulting in an overflow state. There is no risk of becoming.

Further, a bodily fluid impermeable sheet 56 is interposed between the absorber 53 and the back sheet 54 so as to prevent leakage of bodily fluid from the back surface. The presence of the sheet 56 also widens the range of materials that can be used as the back sheet 54.

  Further, in this embodiment, the gather is extended in the front-rear direction, one end in the width direction is fixed to the side part of the absorber 53, and the other end is a free end except for the front-rear front-rear end. A three-dimensional gather mainly composed of a sheet 58 and an elastic elastic member 59 made of one or a plurality of thread rubbers or the like fixed in a stretched state along the front-rear direction at a free end side portion of the gather sheet 58. , Provided along both side edges of the absorber 53. By this three-dimensional gather, the side leakage prevention effect is improved.

[Method for Producing Absorber 53]
FIG. 3 shows an example of a production facility for the strip-shaped absorbent body 53, and a strip-shaped absorbent material 52 formed of a continuous strip-shaped fiber assembly made of tows having a desired width and density is supplied. ing. For this reason, this absorbent body production line is directly connected to a fiber assembly production line (FIG. 4), which will be described later, and the band-shaped absorbent material 52 produced on the fiber assembly production line is directly fed to the present absorbent production line. Can do.

  The supplied belt-like absorbent material 52 is fed into the rotary drum 82 and guided while being in contact with the outer peripheral surface of the rotary drum 82, so that the traveling direction is reversed. The reversed strip-shaped absorbent material 52 is laminated on the strip-shaped holding sheet 60 whose traveling direction is changed by the rotary drum 82. Prior to changing the traveling direction of the belt-shaped holding sheet 60, an adhesive such as a hot melt adhesive is applied to the surface by a coating device 85 that performs bead coating, curtain coating, and the like. Therefore, the strip-shaped absorbent material 52 and the strip-shaped holding sheet 60 are joined by the adhesive force of the adhesive.

At the same time as this lamination / joining or after the lamination / joining, the belt-like holding sheet 60 is laminated on the belt-like crepe paper 57 as shown in the drawing. The crepe paper 57 is transported from the left side to the right side by a transport conveyor 81 such as a belt conveyor, and before the holding sheets 60 are stacked, a coating apparatus that performs bead coating, curtain coating, and the like on the surface. 86, an adhesive such as a hot melt adhesive is applied. Therefore, the belt-shaped holding sheet 60 and the belt-shaped crepe paper 57 are joined by the adhesive force of the adhesive. By this joining, a strip-shaped laminate having a three-layer structure in which the strip-shaped absorbent material 52, the strip-shaped holding sheet 60, and the strip-shaped crepe paper 57 are stacked in this order is completed. The strip-shaped laminate is directly transported from the left side to the right side by the transport conveyor 81, and the absorbent polymer is dispersed on the surface thereof, that is, the surface of the strip-shaped absorbent material 52. At the same time as this spraying or following the spraying as in the illustrated example, a gas flows from the absorbent material 52 side to the crepe paper 57 side, and the absorbent polymer is mixed into the absorbent material 52. In the conventional manufacturing method in which the absorbent material 52 is formed of pulp, the absorbent polymer is mixed before the absorbent material 52 is laminated on another member such as the crepe paper 57. However, in this embodiment, the absorbent material 52 because it is formed by a fiber aggregate composed of tow, according to the same method, almost all of the absorbent polymer, there is a possibility that exits absorber 5 2 or al. In the jaw, as in this embodiment, it is mixed after lamination.

  The reason why the gas flows from the absorbent material 52 side to the crepe paper 57 side is to mix the absorbent polymer into the absorbent material 52 due to the passing force of the gas, and the method is not particularly limited. In the illustrated example, a suction hole (not shown) is provided on the surface of the transport conveyor 81, and suction is performed from the upper side to the lower side of the paper by a suction pump (not shown) over a predetermined range in the transport direction. By this suction, air flows from the absorbent 52 side to the crepe paper 57 side. In this embodiment, in particular, since the holding sheet 60 is interposed between the absorbent material 52 and the crepe paper 57, the absorbent polymer is mixed into the absorbent material 52 by the gas passing force. Even with such a method, there is no possibility that the absorbent polymer escapes from the absorbent material 52, accumulates on the crepe paper 57, and moves.

  After the absorbent polymer is sprayed on the strip-shaped absorbent material 52, a sheet (not shown) is put on the strip-shaped absorbent material 52 prior to suction (ventilation). If the sheet is covered prior to suction (ventilation), a stronger suction force (breathing force) acts on the absorbent polymer and absorbs the absorbent polymer more efficiently than when nothing is covered. It can be moved and dispersed inside the material 52. As a sheet | seat covered on the absorbent material 52, liquid permeable sheets, such as a crepe paper, a nonwoven fabric, and a perforated sheet, and liquid impervious sheets, such as a polyethylene film, can be used.

  In the case of covering the absorbent material 52 with a sheet, it is also preferable to apply an adhesive such as a hot-melt adhesive to the surface of the sheet on the side of the absorbent material 52 before covering the sheet. When this form is adopted, the absorbent polymer exposed on the surface of the absorbent material 52 is fixed to the sheet by the adhesive, and only the non-adherent absorbent polymer moves into the absorbent material 52 by the subsequent suction (ventilation). It becomes like this. It is also a preferred form that an adhesive such as a hot melt adhesive is applied to the surface of the band-shaped absorbent material 52 before the absorbent polymer is sprayed. This is because the absorbent polymer is fixed to the absorbent material 52 as described above. Application | coating of these adhesive agents can be applied combining any 1 or 2 or more.

  The absorbent material 52 in which the absorbent polymer is mixed is obtained by causing the both sides of the crepe paper 57 to wrap around the both side ends of the absorbent material 52 by a sailor or the like so that the absorbent material 52 is wrapped by the crepe paper 57. Then, it is cut into a predetermined length to obtain individual absorbers 53. If the previous suction (ventilation) is performed after the wrapping, an improvement in suction force can be expected without covering the absorbent material 52 with a sheet.

  By the way, the quantitative arrangement of the absorbent polymer, the density distribution, and the fiber density of the fiber assembly made of tow are preferably uniform for the purpose of general purpose. However, when the purpose is to exhibit a special absorption characteristic, it is preferable to bias in accordance with the purpose.

Specifically, for example, the quantitative arrangement of the absorbent polymer can be biased by biasing the polymer application amount with respect to the planar direction. Further, the density distribution of the absorbent polymer can be biased by biasing the suction force (breathing force) / suction time with respect to the plane direction. This is because a larger amount of the absorbent polymer moves to the conveyor 81 side in places where the suction force is strong and where the suction time is longer. Furthermore, during the production of fiber aggregate consisting of preparative c performs biased opening or by partly or the like is used by bundling a plurality of tows, that the fiber density of the fiber aggregate composed of tow, biases it can.

[Material of each component]
(Fiber aggregate made of tow (absorbent material 52))
The fiber assembly made of the tow of the present invention is made of a tow (fiber bundle) composed of fibers (manufactured using tow as a raw material). Examples of tow fibers include polysaccharides or derivatives thereof (cellulose, cellulose ester, chitin, chitosan, etc.), synthetic polymers (polyethylene, polypropylene, polyamide, polyester, polylactamamide, polyvinyl acetate, etc.). In particular, cellulose esters and cellulose are preferable.

  As cellulose, cellulose derived from plants such as cotton, linter, and wood pulp, and bacterial cellulose can be used. Regenerated cellulose such as rayon may be used, and the regenerated cellulose may be a spun fiber. The shape and size of cellulose is a continuous fiber that can be regarded as a substantially infinite length and has a long diameter of several millimeters to several centimeters (for example, 1 mm to 5 cm), and a particle diameter of several microns (for example, 1 to 100 μm) Can be selected from various sizes up to a fine powder. Cellulose may be fibrillated, such as beaten pulp.

  Examples of the cellulose ester include organic acid esters such as cellulose acetate, cellulose butyrate, and cellulose propionate; mixed acid esters such as cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate phthalate, and cellulose nitrate acetate; polycaprolactone graft Cellulose ester derivatives such as hydrogenated cellulose ester can be used. These cellulose esters can be used alone or in admixture of two or more. The average degree of polymerization of the cellulose ester is, for example, about 50 to 900, preferably about 100 to 800. The average substitution degree of the cellulose ester is, for example, about 1.5 to 3.0 (for example, 2 to 3).

  The average degree of polymerization of the cellulose ester can be, for example, 10 to 1000, preferably 50 to 900, more preferably about 100 to 800, and the average degree of substitution of the cellulose ester is, for example, about 1 to 3, preferably 1. It can be about 5 to 2.8, more preferably about 2.2 to 2.7. The average degree of substitution of the cellulose ester can be selected from the viewpoint of enhancing biodegradability.

  As the cellulose ester, an organic acid ester (for example, an ester with an organic acid having about 2 to 4 carbon atoms), particularly cellulose acetate is suitable. This is because cellulose acetate can easily adjust the porosity.

  In addition, the acetylation degree of cellulose acetate is often about 43 to 62%, but about 40 to 60% is particularly preferable because it is excellent in biodegradability.

  The tow constituent fiber may contain various additives such as a heat stabilizer, a colorant, an oil agent, a yield improver, a whiteness improver, and the like. Of these, the oil agent is effective for skin care that also serves as a water repellency, and may be applied to the tow constituent fibers.

  The fineness of the tow constituent fibers can be, for example, about 1 to 16 denier, preferably about 1 to 10 denier, and more preferably about 2 to 8 denier. The tow constituent fiber may be a non-crimped fiber, but is preferably a crimped fiber. The degree of crimp of the crimped fibers can be, for example, 5 to 75, preferably 10 to 50, and more preferably 10 to 40 per inch (2.54 cm). Further, a crimped fiber that is uniformly crimped is often used. When crimped fibers are used, a bulky and light absorbent material can be manufactured, and a tow with high integrity can be easily manufactured by entanglement between the fibers. The cross-sectional shape of the tow constituting fiber is not particularly limited, and may be any one of, for example, a circular shape, an oval shape, an irregular shape (for example, a Y shape, an X shape, an I shape, an R shape) or a hollow shape. Also good. The tow constituting fibers are used in the form of tows (fiber bundles) formed by bundling, for example, about 1,000 to 1,000,000, preferably about 2,000 to 1,000,000 single fibers. can do. The fiber bundle is preferably formed by bundling about 1,000 to 1,000,000 continuous fibers.

  Tow is excellent in air permeability due to weak entanglement between fibers, but may sag. Therefore, for the purpose of preventing sagging and maintaining a wide gap, it is preferable to use a binder having an action of bonding or fusing the contact portion of the fiber.

  Examples of binders include ester plasticizers such as triacetin, triethylene glycol diacetate, triethylene glycol dipropionate, dibutyl phthalate, dimethoxyethyl phthalate, and triethyl citrate, as well as various resin adhesives, especially thermoplastic resins. Can be used.

  The thermoplastic resin is a resin that exhibits an adhesive force when melted and solidified, and includes a water-insoluble or hardly water-soluble resin and a water-soluble resin. A water-insoluble or poorly water-soluble resin and a water-soluble resin can be used together as necessary.

  Examples of water-insoluble or hardly water-soluble resins include olefinic homo- or copolymers such as polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, polyvinyl acetate, polymethyl methacrylate, methacryl Acid methyl-acrylic acid ester copolymer, acrylic resin such as copolymer of (meth) acrylic monomer and styrene monomer, polyvinyl chloride, vinyl acetate-vinyl chloride copolymer, polystyrene, styrene monomer ( Styrenic polymers such as copolymers with (meth) acrylic monomers, optionally modified polyesters, nylon 11, nylon 12, nylon 610, nylon 612 and other polyamides, rosin derivatives (eg, rosin esters), Hydrocarbon resin (for example, terpene resin Dicyclopentadiene resin, petroleum resin), and hydrogenated hydrocarbon resins. One or two or more of these thermoplastic resins can be used.

  Examples of water-soluble resins include various water-soluble polymers such as polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl ether, vinyl monomers, and copolymerizable monomers having a carboxyl group, a sulfonic acid group, or a salt thereof. Vinyl water-soluble resins such as copolymers, acrylic water-soluble resins, polyalkylene oxides, water-soluble polyesters, water-soluble polyamides, and the like can be used. These water-soluble resins can be used alone or in combination of two or more.

  Various additives such as stabilizers such as antioxidants and ultraviolet absorbers, fillers, plasticizers, preservatives, and antifungal agents may be added to the thermoplastic resin.

  The fiber assembly can be produced by a known method using tow as a raw material, and at that time, it can be opened in a strip shape so as to have a desired size and bulk as necessary. The opening width of the tow is arbitrary, and can be, for example, a width of 70 to 2000 mm, preferably about 100 to 1500 mm. It is preferable to open the tow because it becomes easier to move the absorbent polymer described later. Moreover, the fiber density of the absorbent body can be adjusted by adjusting the degree of tow opening.

  Tow opening methods include, for example, a method in which tow is spread over a plurality of opening rolls, and the tow width is gradually expanded as the tow progresses, and tow tension (elongation) and relaxation (contraction) And the like, and a method of widening and opening using compressed air can be used.

  FIG. 4 is a schematic diagram illustrating an example of the opening facility. In this example, the tow 71 serving as a raw fabric is sequentially fed out, and in the conveying process, a widening means 77 using compressed air and a plurality of spread nip rolls 73, 74, 75 whose peripheral speed is faster as the downstream side roll is combined. After passing through the opened portion and widened / opened, the fiber is passed through a binder addition box 76 and a binder is added (for example, the box is filled with mist of triacetin), and the fibers are made of tow having a desired width and density. It is formed as an aggregate (52).

(Surface sheet 51)
In the present embodiment, the top sheet 51 has a property of transmitting body fluid. Therefore, the material of the surface sheet 51 is sufficient as long as it exhibits this body fluid permeability, and examples thereof include a porous or non-porous nonwoven fabric and a porous plastic sheet. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. Examples include synthetic fibers such as polyethylene and polypropylene such as olefins, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers in which two or more of these are used. can do. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, and a needle punch method. For example, the spun lace method is a preferable processing method when the flexibility and drape properties are required, and the thermal bond method is the preferable processing method when the bulkiness and softness are required.

  Further, the top sheet 51 may be composed of one sheet or may be composed of a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 51 may be composed of one sheet or two or more sheets in the planar direction.

(Back sheet 54)
In the present invention, the back sheet 54 simply means a sheet disposed on the back side of the absorber 53, and in the present embodiment, the sheet is sandwiched between the top sheet 51 and the absorber 53. Therefore, the material of the back sheet 54 is not particularly limited. However, it is preferable that the back sheet 54 has a property of not transmitting body fluid. Specifically, for example, an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, a nonwoven fabric that substantially ensures liquid impermeability by interposing a waterproof film (in this case, The back sheet 54 is comprised with a waterproof film and a nonwoven fabric.) Etc. can be illustrated. Of course, in addition to this, materials having liquid impermeability and moisture permeability, which have been used and used in recent years from the viewpoint of preventing stuffiness, can also be exemplified. As the sheet of the material having liquid impermeability and moisture permeability, for example, an inorganic filler is kneaded in an olefin resin such as polyethylene or polypropylene, and the sheet is formed, and then stretched in a uniaxial or biaxial direction. Examples of the microporous sheet obtained in this way can be given.

(Holding sheet 60)
In the present embodiment, the holding sheet 60 holds the absorbent polymer that has slipped out of the absorbent material 52. Therefore, the material is not particularly limited as long as it has a retention property of the absorbent polymer. Specifically, for example, non-woven fabric, crimped pulp, low-absorbency cotton fiber (for example, non-degreased cotton fiber, degreased cotton fiber, rayon fiber treated with a water repellent or a hydrophobizing agent, etc.). ), Polyethylene fiber, polyester fiber, acrylic fiber, polypropylene fiber, silk, cotton, hemp, nylon, polyurethane, acetate fiber and the like.

However, when the holding sheet 60 and the nonwoven fabric, compression energy is 0.01~10.00gfcm / cm ² based on KES test, preferably, at 0.01~1.00gfcm / cm ^2, and the compression resilience 10 It is good that it is -70%, preferably 10-50% non-woven fabric.

Here, the compression energy (WC) is energy consumption when pressing the central part of the test piece (holding sheet) cut to a length of 200 mm and a width of 50 mm up to 50 g. Therefore, if the material of the holding sheet is bulky and soft, that is, if the holding property of the absorbent polymer is excellent, it takes time to press the material, and the compression energy increases.
This compression energy can be measured with a handy compression tester (KES-G5, manufactured by Kato Tech). The measurement conditions for this tester are: SENS: 2, force meter type: 1 kg, SPEED RANGE: STD, DEF sensitivity: 20, pressurization area: 2 cm ² , capture interval: 0.1 (standard), STROKE SET: 5.0, upper limit load: 50 gf / cm ² .

On the other hand, the compression resilience (RC) is a parameter representing the recoverability when the fiber is compressed. Therefore, if the recoverability is good, the compression resilience increases.
This compression resilience can be measured with a handy compression tester (KES-G5, manufactured by Kato Tech). The measurement conditions for this tester are the same as for the compression energy.

  In the present embodiment, the state of the holding sheet 60 is not particularly limited. For example, it can be a single sheet, a laminated sheet formed by laminating two, three, four or more sheets, or a core.

(Absorbent polymer)
As an absorptive polymer, what absorbs and holds a bodily fluid of its own weight, for example, 10 times or more can be used. Examples include starch-based, cellulose-based and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, cross-linked sodium carboxymethyl cellulose and acrylic acid. A (salt) polymer or the like can be used. The shape of the absorbent polymer is preferably a granular material that is usually used, but other shapes can also be used.

The application amount (weight per unit area) of the absorbent polymer can be appropriately determined according to the absorption amount required for the use of the absorbent material 52. Therefore, although it cannot be generally stated, for example, it can be set to 3 to 400 g / m ² .

(Second seat 55)
In this Embodiment, the raw material of the second sheet | seat 55 should just have a property which permeate | transmits a bodily fluid, and the kind is not specifically limited. For example, the same material as exemplified as the top sheet 51 can be used.

(Body fluid impermeable sheet 56)
In the present embodiment, the body fluid impermeable sheet 56 only needs to have a property of not transmitting body fluid, and the type thereof is not particularly limited. For example, the same material as exemplified as the back sheet 54 can be used.

(Gather sheet 58)
In the present embodiment, the material of the gather sheet 58 may have a property of permeating body fluids or a property of not permeating body fluids, and the type thereof is not particularly limited. For example, the same material as exemplified as the top sheet 51 and the back sheet 54 can be used.

  However, from the standpoint of preventing blurring due to touch and rubbing, a nonwoven fabric is preferable, and a bulky nonwoven fabric such as an air-through nonwoven fabric is more preferable.

  Moreover, it is preferable that the water-repellent treated nonwoven fabric or the hydrophilic treated nonwoven fabric is used alone or in combination depending on the function to be regarded as important. Specifically, for example, if importance is attached to prevention of penetration of body fluids and improvement of touch feeling, it is a water repellent nonwoven fabric coated with a silicon-based, paraffin-based, alkylchromic chloride-based water repellent or the like. Is preferred. On the other hand, if importance is attached to the absorbability of bodily fluids, in the synthetic fiber manufacturing process, for example, a method of polymerizing a compound having a hydrophilic group such as an oxidation product of polyethylene glycol in the coexistence or the surface of the synthetic fiber It is made porous by dissolving partially with metal salt such as stannic chloride to make the synthetic fiber swelled or porous by applying metal hydroxide, etc. It is preferable that it is the hydrophilic treatment nonwoven fabric obtained.

  The gather sheet 58 is preferably a hydrophilic nonwoven fabric rather than a water-repellent nonwoven fabric. In addition to the above-mentioned hydrophilic treatment nonwoven fabric, for example, natural fibers, synthetic fibers, regenerated fibers, etc. as raw materials, those obtained by an appropriate processing method, and those with a reduced weight per unit and breathability Etc. can be illustrated.

(Elastic elastic member 59)
In the present embodiment, the material of the elastic stretchable member 59 is not particularly limited as long as it has stretchability. For example, a stretchable hot melt, a stretchable film, a thread rubber, a flat rubber and the like can be exemplified. Examples of the material include styrene-based, olefin-based, urethane-based, and ester-based rubbers, and foams such as polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, and polyester.

  The present invention is applicable as absorbent articles such as disposable diapers, sanitary napkins, urine pads, and incontinence pads, and absorbent bodies that can be used for the absorbent articles.

It is a top view of the paper diaper of this Embodiment. It is the II sectional view taken on the line of FIG. It is the schematic which shows the manufacture flow of an absorber. It is the schematic which shows the manufacturing flow of a fiber assembly.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 50 ... Absorbent article, 51 ... Top sheet, 52 ... Absorbent material, 53 ... Absorber, 54 ... Back sheet, 55 ... Second sheet, 56 ... Body fluid impermeable sheet, 57 ... Crepe paper, 58 ... Gather sheet, 59 ... elastic elastic member, 60 ... holding sheet.

Claims (4)

An absorbent article provided with an absorber in which an absorbent material mixed with an absorbent polymer is wrapped with crepe paper between a top sheet and a back sheet,
The absorbent material is a fiber assembly made of tow,
And the holding sheet which hold | maintains the absorptive polymer which slipped out from the said absorber is interposed between the said absorber back surface and the said crepe paper, The absorbent article characterized by the above-mentioned. The absorbent article according to claim 1, wherein the holding sheet is a nonwoven fabric having a compression energy based on a KES test of 0.01 to 10.00 gfcm / cm ² and a compression resilience of 10 to 70%.   The absorbent article according to claim 1 or 2, wherein the constituent fiber of the fiber assembly made of tow is a fiber of cellulose acetate. A method for producing an absorbent body in which an absorbent material mixed with an absorbent polymer is wrapped in crepe paper,
As the absorbent material, using a fiber assembly made of tow,
And after laminating | stacking in order of the said absorbent material, the holding sheet | seat which hold | maintains the absorbent polymer which came out from this absorbent material, and the said crepe paper, an absorbent polymer is sprayed on the said absorbent material, and the said crepe from the said absorbent material side The manufacturing method of the absorber characterized by flowing gas to the paper side.

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