WO2011065262A1 - 吸水性材料の集合体を薄くする方法およびその方法によって得られる厚さの薄い吸水性材料の集合体 - Google Patents

吸水性材料の集合体を薄くする方法およびその方法によって得られる厚さの薄い吸水性材料の集合体 Download PDF

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Publication number
WO2011065262A1
WO2011065262A1 PCT/JP2010/070439 JP2010070439W WO2011065262A1 WO 2011065262 A1 WO2011065262 A1 WO 2011065262A1 JP 2010070439 W JP2010070439 W JP 2010070439W WO 2011065262 A1 WO2011065262 A1 WO 2011065262A1
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WIPO (PCT)
Prior art keywords
aggregate
water
breathable
pair
water vapor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2010/070439
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English (en)
French (fr)
Japanese (ja)
Inventor
裕樹 合田
水谷　聡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unicharm Corp
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Unicharm Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Unicharm Corp filed Critical Unicharm Corp
Priority to US13/512,660 priority Critical patent/US20120231946A1/en
Priority to CN2010800540669A priority patent/CN102630260A/zh
Priority to EP10833109.1A priority patent/EP2508662B1/en
Priority to AU2010323772A priority patent/AU2010323772A1/en
Publication of WO2011065262A1 publication Critical patent/WO2011065262A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/407—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties containing absorbing substances, e.g. activated carbon
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F13/15617—Making absorbent pads from fibres or pulverulent material with or without treatment of the fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/425—Cellulose series
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/48—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation
    • D04H1/49—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation entanglement by fluid jet in combination with another consolidation means

Definitions

  • the present invention relates to a method for thinning an aggregate of water-absorbent materials that can be used as a water-absorbent core material in disposable body fluid treatment articles such as disposable diapers, sanitary napkins, and urine absorbing pads, and the thickness obtained by the method.
  • the present invention relates to an assembly of thin water-absorbing materials.
  • FIG. 18 is a diagram showing one conventional example of a process for manufacturing a water-absorbent core material.
  • a second web 524 which is a continuous body of tissue paper, is supplied to the peripheral surface 551a of the suction roll 551 from the upstream in the machine direction MD.
  • Suction 556 acts on the peripheral surface 551a toward the center of the suction roll 551.
  • the second web 524 enters the water absorbent material supply portion 552 and is sucked into the concave portion 553 formed in the peripheral surface 551 a by the action of the suction 556 of the roll 551.
  • the ground pulp 521 and the highly water-absorbing polymer particles 522 are accumulated inside the concave portion 553 by the action of the suction 556 to form a water-absorbing material aggregate 560.
  • the assembly 560 exiting the supply unit 552 is sandwiched by a first web 523 which is a continuous body of tissue paper supplied from above and a second web 524 on which the assembly 560 is placed, so that the first composite web is sandwiched. It becomes 561 and proceeds in the machine direction MD, and is compressed by a pair of press rolls 550 to become a second composite web 562 having a required thickness. The thickness is adjusted by changing the gap between the pair of press rolls 550.
  • the second composite web 562 that has passed through the press roll 550 is cut between the adjacent assemblies 560 to form individual water-absorbing core members 513.
  • Patent Document 1 The core material of the disposable diaper in the invention described in US Pat. No. 3,938,522 (Patent Document 1) contains pulverized pulp, and the pulverized pulp running in the machine direction as a web is calender roll. After being compressed with water, it is sprinkled with water and again compressed with a calender roll.
  • Patent Document 2 The invention described in Japanese Patent No. 2512415 (Patent Document 2) is an air-made dry mixture of hydrophilic fibers and discrete particles of a water-insoluble crosslinked polymer hydrogel, which is about 0.15 to An absorbent structure having a density of 1 g / cm 3 , a water content of less than about 10% by weight and a Gurley stiffness value of less than 2 g, is flexible and substantially unbonded. is there.
  • the dry mixture of air-made hydrophilic fibers and water-insoluble hydrogel particles can be compressed to a density of about 0.15 to 1 g / cm 3. is necessary.
  • the collection of water-absorbing materials used in body fluid treatment products contains hydrophilic fibers, they tend to be thick, so wear the body fluid treatment product with the assembly as thin as possible. It is preferable to have a good wearing feeling that is not bulky.
  • the aggregate when the aggregate is compressed to the required thickness according to the prior art, the aggregate is reduced to a thickness much smaller than the required thickness, taking into account the thickness recovery after compression. Must be compressed. If the aggregate contains superabsorbent polymer particles when compressed in such a manner, the shape of the superabsorbent polymer particles collapses, exposing the polymer component having a low crosslink density inside the particles, and absorbing water. In some cases, the highly water-absorbing polymer particles easily form a gel block.
  • the aggregate in which the gel block is formed may not function as a water-absorbing material because the superabsorbent polymer particles confined in the gel block cannot contact the body fluid.
  • the core material containing the body significantly reduces the amount of absorbed body fluid and the absorption rate.
  • excessive compression on the aggregate may cause the hydrophilic fibers or the hydrophilic fibers and the superabsorbent polymer particles to adhere to each other in a part of the aggregate to form a particularly dense part. For this reason, the core material may become uneven in flexibility and water absorption.
  • An object of the present invention is to provide a novel method for thinning an aggregate of water-absorbing materials including hydrophilic fibers and highly water-absorbing polymer particles, and to provide a thin water-absorbing material obtained by the method.
  • the provision of aggregates is to provide a novel method for thinning an aggregate of water-absorbing materials including hydrophilic fibers and highly water-absorbing polymer particles, and to provide a thin water-absorbing material obtained by the method. The provision of aggregates.
  • the present invention for solving the above-described problems includes a first invention relating to a method for reducing the thickness of an aggregate of water-absorbing materials, and an aggregate of water-absorbing materials manufactured by the method and having a reduced thickness. And the second invention according to the present invention.
  • the first invention is directed to a method in which an aggregate of water-absorbing materials including hydrophilic fibers and highly water-absorbing polymer particles has a thickness direction, and the aggregate is thinned in the thickness direction. is there.
  • the first invention is characterized in that the aggregate is thinned by injecting water vapor having a temperature equal to or higher than the boiling point of water to the aggregate while compressing the aggregate in the thickness direction. That's it.
  • the water vapor is one of wet water vapor, saturated water vapor, and dry water vapor.
  • the water vapor is high-pressure water vapor having a vapor pressure of 0.1 to 2.0 MPa.
  • one of the pair of breathable supports is compressed while the aggregate is compressed by a pair of breathable supports opposed to each other in the thickness direction of the aggregate.
  • the water vapor is sprayed onto the aggregate in the thickness direction.
  • the water vapor that has been injected into the aggregate and passed through the aggregate is sucked by the action of vacuum pressure.
  • the pair of breathable supports are opposed to the one of the pair of breathable supports while running in one direction at a speed of 5 to 500 m / min. the water vapor of the surface area of the assemblies for injecting the range of 1.23kg / m 2 ⁇ 0.03kg / m 2.
  • the pair of breathable supports is in a horizontal direction, a vertical direction, and between the two directions in a state where the aggregate is interposed between the two supports. A part that travels in any one of the inclined directions is included.
  • each of the pair of breathable supports is an endless belt.
  • the assembly is mechanically compressed in the thickness direction to thin the assembly in advance, and then compressed into the assembly while compressing the assembly.
  • the water vapor is injected.
  • the assembly is mechanically compressed using at least a pair of press rolls to thin the assembly in advance.
  • the assembly includes at least one of a portion facing the one of the pair of breathable supports and a portion facing the other of the pair of breathable supports. After being covered with either a breathable sheet or a breathable liquid-permeable sheet, it is interposed between the pair of breathable supports.
  • the assembly includes a portion of the pair of breathable supports that is opposed to the one of the pair of breathable supports and the pair of breathable supports after the water vapor is jetted.
  • One of the parts facing one side is covered with one of a breathable sheet, a breathable liquid-permeable sheet, and a non-breathable sheet.
  • the aggregate after spraying the water vapor is separated from either the one of the pair of breathable supports or the other of the pair of breathable supports.
  • a vacuum pressure is applied to the assembly through the other support with respect to any one of the breathable supports.
  • the aggregate includes 98 to 10% by weight of the hydrophilic fibers and 2 to 90% by weight of the superabsorbent polymer particles.
  • the hydrophilic fiber is any one of fluff pulp, cotton fiber, rayon fiber, acetate fiber, and a hydrophilic synthetic thermoplastic fiber.
  • the superabsorbent polymer particles are polyacrylic acid, polyacrylic acid salt, starch acrylonitrile graft copolymer, polyvinyl alcohol, polyvinyl ether, polyacrylamide, carboxymethylcellulose, natural Any particle of polysaccharide.
  • one of the breathable sheet and the breathable liquid-permeable sheet is either tissue paper or non-woven fabric.
  • the subject matter of the second invention of the present invention is an aggregate of water-absorbing materials manufactured by the method according to the first invention and having a reduced thickness.
  • the water-absorbing material is compressed while compressing the aggregate of water-absorbing materials. Since water vapor having a temperature equal to or higher than the boiling point of water is sprayed onto the aggregate, the entire thickness of the aggregate of the water-absorbing material is quickly heated / humidified or heated to make the aggregate thin. can do.
  • the hydrophilic fibers in the aggregate when water vapor is injected are easily deformed without being compressed at a high pressure, and are unlikely to return to the original shape. Aggregates containing such hydrophilic fibers also quickly become thin and do not return to their original thickness.
  • the partial fracture top view of a disposable diaper The figure which shows the II-II line
  • FIG. 1 is a partially broken plan view of an open-type disposable diaper 1 in which an example of a thin water-absorbing material aggregate according to the present invention is used as a body fluid-absorbing core material 13.
  • the diaper 1 has a longitudinal direction A and a width direction B orthogonal to each other, a rectangular chassis 2 formed to be long in the longitudinal direction A, and attached to a front portion of the chassis 2 and extending in the width direction B.
  • a pair of front wings 3 and a pair of rear wings 4 attached to the rear portion of the chassis 2 and extending in the width direction B are included.
  • a crotch region 6 is formed between the front wing 3 and the rear wing 4.
  • a front waistline region 7 is formed in front of the crotch region 6.
  • a rear waistline region 8 is formed.
  • the chassis 2 includes a liquid-permeable top sheet 11, a liquid-impermeable back sheet 12, and a body fluid-absorbing core material 13 interposed between the two sheets 11 and 12, and the back sheet 12 is a non-woven fabric with a good touch.
  • the outer sheet 14 is made of a metal.
  • the top sheet 11 and the back sheet 12 extend from the peripheral edge portion 51 of the core member 13 and overlap each other, and are joined via a hot melt adhesive 41a.
  • the top sheet 11, the back sheet 12, and the outer sheet 14 form both side edge portions 18 and front and rear end edge portions 61 and 62 of the chassis 2 at portions extending from the core member 13.
  • Each of the side edges 18 is formed with a breakwater 31 by a sheet piece that is long in the front-rear direction A.
  • the breakwater 31 is bonded to the side edge 18 via the hot melt adhesive 32a and to the front edge 61 via the hot melt adhesive 32b.
  • the top sheet 11 is located inside the chassis 2 with respect to the front edge 34, the rear edge 36 joined to the rear edge 62 through the hot melt adhesive 32c, and the base edge 33.
  • a free edge portion 37 which overlaps with the elastic member 39 in a stretched state via a hot melt adhesive (not shown) inside a sleeve 38 formed on the free edge portion 37. Yes.
  • leg elastic members 41 extending in the front-rear direction A are located between the outer sheet 14 and the base edge 33 of the leakage breaker 31, and the outer sheet via the hot melt adhesive 41 a. 14 is attached.
  • a front waistline elastic member 42 extending in the width direction B is provided between the top sheet 11 and the back sheet 12, and a hot melt adhesive is applied to at least one of the sheets 11 and 12. (Not shown).
  • a rear waistline elastic member 43 extending in the width direction B is located between the top sheet 11 and the back sheet 12, and hot melt bonding is performed on at least one of these sheets 11 and 12. It joins via the agent (not shown).
  • the chassis 2 thus formed has a front wing 3 attached to a side edge 18 in the front waist area 7 so as to extend in the width direction B, and a side edge in the rear waist area 8.
  • a rear wing 4 is attached to 18 so as to extend in the width direction B.
  • a tape fastener 46 is attached to the rear wing 4. When the diaper 1 is worn, the tape fastener 46 extends in the width direction B as indicated by the phantom line, and uses the adhesive 47 applied to the inner surface of the tape fastener 46 to apply the outer surface or front of the chassis 2. It can be fixed to the outer surface of the wing 3 in a peelable manner.
  • FIG. 2 is a diagram showing a cut surface of the core material 13 along the line II-II in FIG. 1, and the thickness direction of the core material 13 is indicated by a double-headed arrow C.
  • FIG. The line II-II in FIG. 1 coincides with the center line MM that bisects the size of the chassis 2 in the front-rear direction A.
  • the core material 13 has an air-permeable and liquid-permeable upper surface on the upper and lower surfaces of the compressed aggregate 20 in a state in which the water-absorbing material including the hydrophilic fibers 21 and the highly water-absorbing polymer particles 22 is compressed and thinned. It is formed by covering with a sheet 23 and a breathable lower surface sheet 24.
  • the hydrophilic fiber 21 occupies 98 to 10% by weight of the compressed aggregate 20, and includes, for example, natural fibers such as pulverized pulp and cotton fibers, semi-synthetic fibers such as rayon fibers, A treated thermoplastic synthetic fiber or the like, and a short fiber having a fiber length of 2 to 80 mm is used.
  • the hydrophilic fiber 21 can be replaced with a hydrophobic thermoplastic synthetic fiber having a fiber length of 20 to 80 mm and not hydrophilized, up to 15% of the weight of the compressed aggregate 20, In some cases, the diffusion property of body fluid in the compressed aggregate 20 can be improved by the thermoplastic synthetic fiber.
  • the superabsorbent polymer particles 22 occupy 2 to 90% by weight of the compressed aggregate 20 and are acrylic acid, acrylate, starch acrylonitrile graft copolymer, polyvinyl alcohol, polyvinyl ether, polyacrylamide, carboxymethylcellulose, natural Known or well-known polymer particles such as polysaccharides can be used. Generally known shapes of these polymers include non-spherical shapes other than spherical shapes, fibrous shapes, etc., and any shape can be used as long as it can be mixed with the hydrophilic fibers 21.
  • the water-absorbing polymer particles 22 can be used.
  • the superabsorbent polymer particle 22 in the present invention means a superabsorbent polymer having a shape that can be mixed with the hydrophilic fiber 21.
  • the superabsorbent polymer particles 22 when the superabsorbent polymer particles 22 can be mixed with the hydrophilic fibers 21, the superabsorbent polymer particles 22 can be mixed with the hydrophilic fibers 21 in addition to the superabsorbent polymer particles 22.
  • the compressed aggregate 20 of the water-absorbing material in other words, in the core member 13 of FIG.
  • the top sheet 23 is used so as to face the top sheet 11, and the bottom sheet 24 is used so as to face the back sheet 12.
  • the top sheet 23 and the bottom sheet 24 have a basis weight which is a mass per unit area. 10-30 g / m 2 tissue paper or a basis weight of 5-40 g / m 2 non-woven fabric, a breathable sheet material that facilitates the permeation of water vapor described later, or a breathable and liquid-permeable sheet Material is used.
  • the top sheet 23 is required to be breathable and liquid permeable so that the body fluid can be easily transferred from the top sheet 11 to the compressed assembly 20.
  • the lower surface sheet 24 can suppress the transfer of body fluid from the compressed assembly 20 toward the back sheet 12 in addition to the case of the air permeable and liquid permeable material in the same manner as the upper surface sheet 23. In addition, it may be required to be liquid-permeable or non-liquid-permeable than the top sheet 23.
  • the upper surface sheet 23 and the lower surface sheet 24 extend from the peripheral edge of the compressed assembly 20 and overlap each other, and act so that the compressed assembly 20 can maintain its shape.
  • FIG. 3 is a diagram showing an example of a process when manufacturing the compressed assembly 20 and the core material 13 including the compressed assembly 20 based on the method according to the present invention.
  • an arrow indicates a machine direction MD that is a flow direction of each material, and a vertical direction TD that is a direction corresponding to the thickness direction C of the core member 13 and is orthogonal to the machine direction MD.
  • a direction orthogonal to the machine direction MD and the up-down direction TD is a cross direction CD (not shown).
  • 3 includes first to fifth steps 101 to 105.
  • the first step 101 located on the upstream side in the machine direction MD it is a continuous body of the bottom sheet 24 in FIG.
  • the second sheet web 224 that is air permeable and liquid permeable is continuously supplied in the machine direction MD using the transport roll 200 that rotates in the machine direction MD.
  • the second step 102 includes a suction drum 151 that rotates in the machine direction MD, and a hooded water-absorbing material supply unit 152 that is formed so as to cover the suction drum 151.
  • a suction drum 151 that rotates in the machine direction MD
  • a hooded water-absorbing material supply unit 152 that is formed so as to cover the suction drum 151.
  • concave portions 153 having a shape substantially matching the planar shape of the core member 13 are formed at a required pitch in the circumferential direction.
  • the supply part 152 is a part which supplies the water absorbing material in this invention with respect to the suction drum 151, Comprising: The pulverized pulp supply part 157 for supplying the pulverized pulp 21a as the hydrophilic fiber 21 which comprises a water absorbing material. And a superabsorbent polymer particle supply part 158 for supplying superabsorbent polymer particles 22 of the constituents of the superabsorbent material, and pulverized pulp 21a toward the recess 153 entering the supply part 152 And the superabsorbent polymer particles 22 can be supplied so as to form a mixed state or a laminated state.
  • the second sheet web 224 that has advanced from the first step 101 is placed on the peripheral surface 151 a of the suction drum 151 and enters the supply unit 152, and is deformed to follow the shape of the recess 153 under the action of the suction 156. Then, the surface of the recess 153 is covered. After the recess 153 is covered with the second sheet web 224 in this way, the pulverized pulp 21a and the superabsorbent polymer particles 22 are supplied.
  • the hooded supply unit 152 is formed in a closed structure so that the suction 156 works effectively, but between the peripheral surface 151a of the suction drum 151, the advancement of the second seat web 224, A gap is formed to allow the water-absorbing material assembly 160 to be described later to advance.
  • the second sheet web 224 placed on the transport roll 200 moves away from the peripheral surface 151a of the suction drum 151 in the machine direction MD.
  • the aggregates 160 of the water-absorbing material that have a shape following the recess 153 and are in an uncompressed state are arranged intermittently in the machine direction MD.
  • the aggregate 160 is formed by the pulverized pulp 21a and the superabsorbent polymer particles 22 that are supplied to and accumulated in the recesses 153 in the second step 102.
  • the first sheet web 223 that is a continuous body of the upper surface sheet 23 and is air permeable or air permeable and liquid permeable is continuously supplied from above in the drawing and cooperates with the second sheet web 224.
  • the assembly 160 is sandwiched, and the assembly 160 that is intermittently aligned with the first sheet web 223 and the second sheet web 224 forms a first composite web 161.
  • the fourth step 104 in FIG. 3 includes a breathable first and second mesh conveyor belts 171 and 172, a steam injection unit 173, and a steam suction unit 174 arranged vertically so as to form a pair in the drawing.
  • the pair of first and second mesh conveyor belts 171 and 172 cause the first composite web 161 including the assembly 160 to travel in the machine direction MD while compressing in the thickness direction of the assembly 160 which is the vertical direction D in the figure. Therefore, in the parallel running unit 175 that is a breathable support for the assembly 160 and the first composite 161 and supports the assembly 160, the machine direction is parallel to each other at a speed of, for example, 5 to 500 m / min. Running to MD.
  • the first and second mesh conveyor belts 171 and 172 have a gap between the upstream upper roll 176 and the upstream lower roll 177 rotating in the machine direction MD, and a gap between the downstream upper roll 178 and the downstream lower roll 179.
  • the dimension of the gap d in the vertical direction TD in the parallel traveling portion 175 can be set to a required value.
  • the assembly 160 and the first composite web 161 in the fourth step 104 can be compressed to a required thickness by the first and second mesh conveyor bare belts 171 and 172 having such dimensions set.
  • a steam traveling unit 175 and a steam suction unit 174 are arranged on the parallel running unit 175 extending horizontally so as to face each other with the pair of first and second mesh conveyor belts 171 and 172 interposed therebetween.
  • nozzles (not shown) having a diameter of 0.1 to 2 mm are provided in the steam injection unit 173 at a pitch of 0.5 to 10 mm, more preferably 0.5 to 5 mm, and still more preferably 0.5 to 3 mm. 1 crosses the composite web 161 in a cross direction CD (not shown) orthogonal to the machine direction MD and the vertical direction TD, and each nozzle has a boiling point equal to or higher than the boiling point of water generated in the steam boiler 180.
  • the water vapor having the temperature is supplied through the pipe 182 as high-pressure water vapor adjusted to a vapor pressure of, for example, 0.1 to 2.0 MPa by the pressure control valve 181. From each nozzle, the high-pressure water vapor (not shown) is passed through the first mesh conveyor belt 171 to the first composite web 161 compressed by the first and second mesh conveyor belts 171 and 172. Is injected.
  • the amount of water vapor sprayed onto the assembly 160 included in the first composite web 161 is an amount adjusted according to the traveling speed of the first and second mesh conveyor belts 171 and 172, and For the assembly 160 when the second mesh conveyor belts 171 and 172 are traveling at 5 to 500 m / min, the assembly facing the first mesh conveyor belt 171 via the first sheet web 223.
  • the water vapor sequentially passes through the first mesh conveyor belt 171, the first composite web 161, and the second mesh conveyor belt 172, and is subjected to vacuum pressure suction by the steam suction unit 174. Recovered under action.
  • the first composite web 161 sprayed with water vapor proceeds in the machine direction MD, is separated from the first and second mesh conveyor belts 171 and 172, becomes the second composite web 162, and goes to the fifth step 105.
  • the first and second mesh conveyor belts are used so that the first composite web 161 is not locally compressed by the first and second mesh conveyor belts 171 and 172.
  • a flexible one that can be easily deformed in the vertical direction TD can be used.
  • a metal wire mesh belt formed of stainless alloy or bronze, or a plastic mesh belt formed of polyester fiber or aramid fiber may be used.
  • a metal belt formed of a perforated metal plate can be used instead of the mesh belt.
  • a mesh belt made of polyphenylene sulfide resin is flexible and can be used for both the first mesh conveyor belt 171 and the second mesh conveyor belt 172. It is an example.
  • the water vapor jetted toward the first composite web 161 may be dry steam that does not include a liquid component that is moisture, may be saturated steam, or may be wet steam that includes a liquid component.
  • the hydrophilic fibers 21 can be easily wetted and deformed. If the hydrophilic fiber 21 is the fluff pulp 21a, the dry steam can vaporize the water contained in the fluff pulp 21a, and the hydrophilic fiber 21 can be easily deformed by the vaporized water. .
  • the hydrophilic fiber 21 is a thermoplastic synthetic fiber, the thermoplastic synthetic fiber can be easily deformed by the heat of dry steam.
  • the steam injection unit 173 may be provided with a heating mechanism to change the steam into superheated steam and spray it. It is preferable that the steam suction unit 174 has a pipe that allows the sucked high-pressure steam to go to an exhaust blower (not shown) after passing through the steam separator.
  • the positions of the steam injection part 173 and the steam suction part 174 in the fourth step 104 are interchanged, that is, the steam injection part 173 is on the lower side and the steam suction part 174 is on the upper side in FIG. It can also be implemented in an embodiment. Further, in the fourth step 104, when it is not necessary to recover the high-pressure steam that has passed through the first composite web 161, the present invention can be implemented without disposing the steam suction 174.
  • the second composite web 162 separated from the first and second mesh conveyor belts 171 and 172 is placed on the transport roll 200 and travels in the machine direction MD. Cut between the bodies 160 to form individual core members 13.
  • the assembly 160 becomes the compression assembly 20 (see FIG. 2) that is compressed by the first and second mesh conveyor belts 171 and 172 and the water vapor to reduce the thickness, and the first and second sheet webs 223 are formed.
  • , 224 become the upper and lower surface sheets 23, 24 in the core material 13.
  • the second composite web 162 is wound into a roll shape to form a continuous body of the core material 13, and the continuous body may be supplied to a production line for disposable diapers. it can.
  • an apparatus for drying the second composite web 162 may be provided.
  • the compressed aggregate 20 in the core material 13 of FIG. 2 obtained through the process of FIG. 3 is a first assembly of the water absorbent material aggregate 160 that is a mixture of the hydrophilic fibers 21 and the highly water absorbent polymer particles 22. Since the high-pressure steam is jetted onto the aggregate 160 while being compressed by the mesh conveyor belt 171 and the second mesh conveyor belt 172, the pulverized pulp 21a, for example, the hydrophilic fiber 21, is heated and humidified. Or it deform
  • the hydrophilic fibers 21 are easily accessible by the action of moisture in the water vapor, and the shape when the hydrophilic fibers 21 are compressed is easily maintained by the interaction of the adjacent hydrophilic fibers 21. It becomes possible.
  • the high-pressure steam used in the present invention is the first composite web. Since passing through 161 is much easier than sprayed water, the entire assembly 160 in the thickness direction can be quickly heated and humidified. According to the process of FIG.
  • the gap d between the first and second mesh conveyor belts 171 and 172 for obtaining the second composite web 162 from the first composite web 161 is
  • the second composite web 162 having a required thickness can be obtained by setting the value close to the thickness required for the second composite web 162 without being excessively small.
  • the ratio between the thickness of the second composite web 162 and the gap d is a value that means the thickness recovery rate r after compression for the first composite web 161, and the recovery rate r is the first composite web 161.
  • the recovery rate r is close to 1. That is, the thickness of the second composite web 162 is close to the gap d. According to the present invention using the fourth step 104, the recovery rate r tends to be close to 1.
  • the first composite web 161 is to be thinned only by being compressed with a press roll as in the prior art, or when the first composite web 161 is to be thinned by being sprinkled on the first composite web 161 and then being compressed with a press roll.
  • the recovery rate r tends to be a value much larger than 1.
  • the gap d must be set to a value much smaller than the required thickness.
  • the present invention Due to such a difference between the present invention and the prior art, in the present invention, the occurrence of the problem that the aggregate 160 of the water-absorbing material and the first composite web 161 are excessively compressed to collapse the shape of the superabsorbent polymer particles 22 is caused. Can be prevented.
  • the compressive force of the press roll is concentrated on the thickened portion, and the particle shape of the highly water-absorbing polymer particles 22 is collapsed, There may be a problem that the water-absorbing polymer particles 22 and the hydrophilic fibers 21 are strongly adhered, or the hydrophilic fibers 21 are excessively adhered to each other.
  • the first and second mesh conveyor belts 171 and 172 are used to compress the first composite web 161 so that the thickness of the first composite web 161 does not become extremely thin, water vapor is sprayed onto the first composite web 161.
  • the compressive force can be prevented from concentrating on the particularly thick portion of the first composite web 161, it is possible to prevent the occurrence of the problem of collapsing the shape of the superabsorbent polymer particles 22, However, it is possible to obtain a flexible core 13 having a high absorption rate.
  • the shape of the superabsorbent polymer particle 22 is, for example, spherical
  • a polymer component having a low crosslink density inside the particle may be exposed due to the collapse of the shape, which means that the highly absorbed polymer This is a cause of facilitating the formation of gel blocks by the water-absorbing polymer particles 22.
  • the highly water-absorbing polymer particles 22 confined inside the gel block have almost no opportunity to come into contact with body fluids, and thus cannot function as a water-absorbing material.
  • the formation of the gel block changes the superabsorbent polymer particles 22 from a small particle size to a large particle size.
  • the formation of the gel block lowers the original water absorbing ability of the aggregate 160 of the water absorbent material or makes the aggregate 160 poor in flexibility. It is not preferable that the shape of this is collapsed.
  • the fibers 21 are separated from the superabsorbent polymer particles 22 and body fluid. This makes it difficult to quickly absorb water in the highly water-absorbing polymer particles 22, so that the core material 13 cannot quickly use the highly water-absorbing polymer particles 22 for water absorption.
  • excessively close contact between the hydrophilic fibers 21 delays the entry of moisture to be absorbed between the fibers, thereby reducing the water absorption rate of the aggregate 160.
  • the process of FIG. 3 according to the present invention can be partially modified.
  • the first composite web 161 can be supplied to the fourth step 104 on a conveyor belt instead of the transport roll 200.
  • the second composite web 162 can be loaded on the conveyor belt instead of the transport roll 200 and supplied toward the machine direction MD.
  • the process of FIG. 3 also supplies the first sheet web 223 in the machine direction MD instead of the second sheet web 224 in the first process 101, and the second process instead of the first sheet web 223 in the third process 103.
  • a sheet web 224 can be fed in the machine direction MD.
  • the second sheet web 224 and the first and second composite webs 161 running horizontally in the machine direction MD in the first step 101, the third, fourth, and fifth steps 103, 104, and 105 are also shown.
  • 162 can make a part of the traveling process vertical or inclined. These changes may be appropriately selected in consideration of the space of the factory where the process of FIG. 3 is to be performed.
  • FIG. 4 is a process diagram similar to FIG. 3 illustrating the embodiment of the present invention. Only the third process 103 is different from the process of FIG. 4 includes a pair of first press rolls 401a and 401b and a pair of second press rolls 402a and 402b for lightly compressing the first composite web 161 in advance by mechanical means. Is provided. A pair of first press roll 401a, a roll gap e 1 and a pair of second rolls 402a of 401b, the roll gap e 2 of 402b, the first first composite web 161 of the pair, the second mesh conveyor belts 171 and 172 The first composite web 161 is set so as to be compressed to such an extent that it can smoothly enter.
  • the lower limits of the gaps e 1 and e 2 are set so as not to be smaller than the gap between the upstream upper roll 176 and the upstream lower roll 177 in the fourth step, and the first press rolls 401a and 401b.
  • excessive compression of the first composite web 161 by the second press rolls 402a and 402b is avoided. By doing so, collapse of the shape of the superabsorbent polymer particles 22 contained in the aggregate 160 is prevented.
  • the first composite web 161 that has exited the second step 102 in FIG. 3 tends to increase in volume as the content ratio of the hydrophilic fibers 21 increases, and the first composite web 161 having a larger volume has a smaller gap d.
  • the assembly 160 When entering between the first and second mesh conveyor belts 171 and 172, the assembly 160 receives a force in the direction in which the assembly 160 is pushed back to the upstream side in the machine direction MD, and the shape of the assembly 160 of the water absorbent material is distorted. There is. However, after the first composite web 161 is compressed by the first press rolls 401a and 401b and the second press rolls 402a and 402b in the third step 103 of FIG. 4, the pair of first and second mesh conveyor belts 171 is used. , 172, it becomes easy to manufacture the core material 13 having a small thickness while preventing an abnormality such as distortion from occurring in the shape of the assembly 160.
  • Various changes can be added to the third step 103 in FIG.
  • one of the pair of first press rolls 401a and 401b and the pair of second press rolls 402A and 402b can be omitted.
  • a press roll can be further added to the third step 103.
  • FIG. 5 is also a process diagram showing an example of the embodiment of the present invention.
  • the breathable first sheet web 223 is continuously supplied in the machine direction MD.
  • the first composite web 161 in the third step 103 of FIG. 5 is formed by the first sheet web 223 and the aggregate 160 of water-absorbing material that is intermittently placed on the first sheet web 223. 3 does not include the second sheet web 224 in FIG.
  • the fourth step 104 the first composite web 161 is located between the first and second mesh conveyor belts 171 and 172 adjusted to the gap d of the required dimension, and is directed from the steam injection unit 173 toward the assembly 160. Water vapor is injected.
  • the conditions of the water vapor injection and the suction are the same as the conditions employed in the process of FIG. However, the length of the 1st mesh conveyor belt 171 in the parallel running part 175 of the 4th process 104 is formed shorter than the length of the 2nd mesh conveyor belt 172.
  • the fourth steps 104 in the step near the downstream upper roll 178 where the first mesh conveyor belt 171 traveling in the machine direction MD is separated from the first composite web 161, the first composite web 161 and the second composite web 161 A second suction box 192 is installed below the mesh conveyor belt 172. The vacuum pressure acting on the assembly 160 from the second suction box 192 via the second mesh conveyor belt 172 is applied when the first mesh conveyor belt 171 is separated from the assembly 160 and thereafter.
  • the same hydrophilic fibers 21, superabsorbent polymer particles 22, and first sheet web 223 used in the process of FIG. 3 can be used.
  • the second sheet web 224 the same material as the second sheet web 224 in the process of FIG. 3 can be used. However, in the process of FIG. 5, water vapor does not permeate the second sheet web 224. Therefore, in addition to the breathable sheet web, a non-breathable sheet web or a non-breathable and liquid-impermeable sheet web can be used.
  • the core material 13 obtained by using the non-liquid permeable second sheet web 224 is such that the second sheet web 224 serves as a leak-proof back sheet in body fluid treatment products such as disposable diapers and sanitary napkins. Can be used.
  • the second sheet web 224 is supplied in the first process 101, and in the fifth process 105.
  • the process of FIG. 5 can be modified to supply the first sheet web 223.
  • FIG. 6 is also a diagram showing a process similar to FIG. 5 which is an example of the embodiment of the present invention.
  • 6 includes first to fifth steps 101 to 105.
  • a suction drum 151 and a water-absorbing hood are provided above the breathable endless belt 110 traveling in the machine direction MD.
  • a material supply unit 152 is provided in the first step 101.
  • the drum 151 and the supply unit 152 are the same as those illustrated in FIG. 5, but the second sheet web 224 is not supplied to the drum 151.
  • Concave portions 153 are formed on the peripheral surface of the drum 151 at a required pitch in the circumferential direction. When the recess 153 enters the supply unit 152, the suction 156 acts on the recess 153.
  • the hydrophilic fibers 21 such as pulverized pulp and the highly water-absorbing polymer particles 22 are supplied toward the recesses 153, thereby forming an aggregate 160 of the water-absorbing material that follows the shape of the recesses 153.
  • the blower 159 acting in place of the suction acts in the recess 153 to discharge the aggregate 160 onto the belt 110.
  • a third suction box 113 is installed below the drum 151 via a belt 110, and the discharged assembly 160 is received on the belt 110 under the action of suction by the third suction box 113. Note that in the drum 151, the assembly 160 is moved forward in a mechanically retractable manner toward the outer side in the radial direction of the drum 151 with the use of the blower 159 or instead of the use of the blower 159. Can also be released.
  • the assembly 160 is placed on the belt 110 and travels in the machine direction MD.
  • the belt 110 travels at a speed of 5 to 500 m / min, for example, and proceeds to the third step 103.
  • the first mesh conveyor belt 171 used in FIG. 3 or FIG. 5, the steam injection unit 173, the steam suction unit 174, and the second suction box 192 In order to set the gap d between the belt 110 and the first mesh conveyor belt 171 to a required value, the vertical gap between the upstream upper roll 176 and the upstream lower roll 177 and the downstream upper roll 178 and the downstream side are set. The vertical gap with the lower roll 179 is adjusted. While the aggregate 160 is compressed by the belt 110 and the first mesh conveyor belt 171, water vapor is sprayed from the steam injection unit 173 to the aggregate 160, and the water vapor is sucked in the steam suction unit 174.
  • the first mesh conveyor belt 171 is shorter than the belt 110 and is separated from the surface of the assembly 160 in the vicinity of the downstream upper roll 178. Therefore, immediately below the downstream upper roll 178, FIG. As in the case of the fourth step 104, the suction of the second suction box 192 is caused to act on the aggregate 160.
  • the assembly 160 separated from the first mesh conveyor belt 171 proceeds to the fourth step 104 while still being placed on the belt 110.
  • the first composite web 161 is caused to enter between the belt 110 and the air-permeable second endless belt 112 that travels in the machine direction MD.
  • the gap between the belt 110 and the second endless belt 112 is set to be approximately the same as the gap d between the belt 110 and the first mesh conveyor belt 171.
  • a fourth suction box 194 capable of applying vacuum suction to the first composite web 161 via the second endless belt 112 is installed.
  • the belt 110 is separated from the aggregate 160 in the first composite web 161 using the downstream lower roll 179 while applying the vacuum pressure to the first composite web 161.
  • the second sheet web 224 is supplied from the lower side of the drawing while the vacuum pressure is applied to the first composite web 161, and faces the second mesh conveyor belt 172 in the assembly 160 in the first composite web 161.
  • the lower surface of the assembly 160 which is the portion that has been removed, is covered with the second sheet web 224 to obtain a second composite web 162 including the assembly 160 and the first and second sheet webs 223 and 224.
  • the second composite web 162 is cut between the adjacent assemblies 160 and 160 by the cutter 185 in the process of traveling in the machine direction MD to become individual core members 13, and the assembly 160 becomes the compression assembly 20. .
  • an air permeable or air permeable sheet web is used as the first sheet web 223, while the air permeable sheet web is used as the second sheet web 224 in addition to the air permeable sheet web.
  • a sheet web or a non-breathable and non-liquid-permeable sheet web can be used.
  • the steps illustrated in FIGS. 3 to 6 include the step of sucking the water vapor jetted from the steam jetting unit 173 by the steam suction unit 174, but the present invention may be carried out without sucking the steam. Is possible.
  • the steam suction unit 174 is not necessary when the sprayed steam easily passes through the web because the basis weight of the target web for steam injection is small or the traveling speed in the machine direction MD is low.
  • a thin compressed assembly 20 manufactured by the method according to the present invention as exemplified by the steps of FIGS. 3 to 6 and a core member 13 including the compressed assembly 20 are shown in FIG.
  • the illustrated disposable diaper 1 can be used as a thin compressed assembly or core material in disposable body fluid treatment products such as sanitary napkins and urine absorbing pads.
  • the present invention described with reference to the steps of FIGS. 3 to 6 in which the compressed aggregate 20 having a small thickness is continuously manufactured from the aggregate 160 is the same as that of the present invention.
  • the present invention can also be carried out on a single composite that is coated with the above. In that case, instead of the pair of breathable supports made of the first and second mesh conveyor belts 171 and 172 that run in the machine direction MD, they move away from each other in the vertical direction TD without running in the machine direction MD.
  • a single assembly 160 or a single composite is compressed by a pair of breathable supports that move in the manner described above, and water vapor is sprayed toward them, thereby producing a thin assembly 160 or a compressed assembly 20. can do.
  • pulverized pulp is used as the hydrophilic fiber at a rate of 240 g / m 2
  • the superabsorbent polymer particles include spherical particles and aggregates of spherical particles ( SA60S manufactured by Co., Ltd. was used at a rate of 240 g / m 2
  • the first sheet web was formed of a core-sheath type composite fiber having a core of polypropylene, a sheath of polyethylene, a fineness of 2 dtex, and a fiber length of 51 mm.
  • assembly of a water absorbing material whose dimension is 300 mm and 200 mm was obtained.
  • the first composite web is advanced to the fourth step in FIG. 3 at a speed of 5 m / min, and a pair of flexibility adjusted to the gaps shown in (1) to (3) below in the horizontal running section of the fourth step.
  • Basis weight a The core material was cut into 100 ⁇ 100 mm to determine the weight. A value obtained by subtracting the basis weight of the first sheet web and the second sheet web from the value 100 times the weight was defined as the basis weight (g / m 2 ) of the aggregate of water-absorbing materials. b. The measurement results are shown in Table 1.
  • Thickness recovery after compression a For each of the core materials of the example and the comparative example, the ratio of the thickness measured in the above (2) and the gap d of the mesh conveyor belt was obtained as the thickness recovery rate r after compression, and the results are shown in Table 1. . b. Since the core material of the example has a small thickness recovery rate r after compression, the core material has a required thickness even if the gap d of the mesh conveyor belt is not set small like the core material of the comparative example. I understood that.
  • a short absorption time means a high absorption rate.
  • e The distance at which the artificial urine diffused in the machine direction and the crossing direction on the upper surface of the specimen was also measured.
  • the measurement results are shown in Table 1.
  • g. As artificial urine, the following was mixed or dissolved in 10 liters of ion-exchanged water. 200g of urea Sodium chloride 80g Magnesium sulfate 8g Calcium chloride 3g Blue No. 1 dye 1g h.
  • Table 1 when the sample specimen of the example and the sample specimen of the comparative example have the same thickness, the sample specimen of the example tended to have a higher water absorption speed. Further, the specimens of the examples tended to increase the absorption rate even though the specimens were thinner than the specimens of the comparative examples.
  • Weighted absorption time a The same specimen as that used in the measurement of the absorption time in (4) was prepared as a specimen.
  • b. A 40 ⁇ 40 mm water-permeable nonwoven fabric piece (Benryse PS140 manufactured by Asahi Kasei Co., Ltd.) was placed in the center of the upper surface of the specimen.
  • c. The specimen and measurement tool were set as shown in FIG. 7, and the tip of the autoburette was set 20 mm above the upper surface of the specimen inside the transparent cylinder shown in the figure.
  • 20 cc of artificial urine was dropped at a rate of 120 cc / min. e.
  • High-precision shape measurement system (component equipment: high-precision stage, KS-1100) and high-speed / high-precision CCD laser displacement meter (component equipment: controller is LK-G3000V set, sensor head) Used LK-G30).
  • the stage conditions were set as follows. Measurement range: 40000 ⁇ m ⁇ 40000 ⁇ m Measurement pitch: 20 ⁇ m Movement speed: 7500 ⁇ m / sec d.
  • the conditions of the measurement head (LK-G3000) were set as follows.
  • Measurement mode Measurement object Installation mode: Diffuse reflection Filter: Average 4 times Sampling cycle: 200 ⁇ s e.
  • the data obtained from the specimen a was processed using shape analysis software (KS-H1A).
  • the Z coordinate was extracted by repeating one of the 16 positions for each of the X and Y coordinates, and transferred to Excel (Excel) of Microsoft's spreadsheet software. With this software, the X, Y, and Z coordinates were graphed as a contour graph. In addition, histogram processing of all Z-axis data was performed using the same software add-in function. f. These measurements and treatments were performed on the core material of Example 3 and Comparative Example 3, and the results are shown in FIGS. 8 and 9 visualize changes in the undulations on the surface of the specimen, and the vertical axis Z indicates the height from the reference surface to the upper surface of the specimen. However, FIGS.
  • FIG. 10 shows the height from the reference surface to the upper surface of the specimen on the horizontal axis for each specimen, and the detected frequency (unit: times) of the height on the vertical axis.
  • the sample specimen of the example had a smaller change in undulation on the upper surface than the sample specimen of the comparative example, and the surface smoothness was good.
  • Ventilation resistance a.
  • the core material was cut into a circle having a diameter of 88 mm, and the first sheet web and the second sheet web were peeled from the aggregate of water-absorbing materials to obtain specimens.
  • b. Using Kato Tech's breathability tester: KES-F8-APL, set the standard ventilation rate: 2 cm / s, measure the ventilation resistance value of the specimen, and measure the ventilation resistance value under dry conditions did.
  • the specimen was allowed to absorb 20 cc of artificial urine and left for 1 minute, and the ventilation resistance value of the specimen was measured in the same manner as b, and the ventilation resistance value under wet conditions was measured.
  • Each of the airflow resistance values was divided by the basis weight of the specimen and compared as the airflow resistance index.
  • Table 2 shows the measurement results for the examples and comparative examples.
  • FIG. 15 shows the relationship between the absorption rate and the specific volume in Table 1.
  • the core material of the example having the same specific volume and the core material of the comparative example a lot of gaps between the hydrophilic fibers 21 and a gap between the hydrophilic fibers 21 and the superabsorbent polymer particles 22 are formed.
  • the core material 13 (see FIGS. 11 and 12) of the embodiment that tends to have a preferable tendency to increase the absorption rate.
  • FIG. 16 is a diagram showing the relationship between the weighted absorption time and the specific volume in Table 1.
  • the core material tends to shorten the absorption time under load as the specific volume increases, that is, the absorption rate under load tends to increase. It was. The tendency was almost the same in Examples and Comparative Examples.
  • FIG. 17 is a diagram showing the relationship between the airflow resistance index and the specific volume in Table 2.
  • the core material of the example and the core material of the comparative example had a tendency that the airflow resistance index of the core material of the example was lower than the airflow resistance index of the core material of the comparative example. This tendency was the same when the core material was in dry conditions and when it was in wet conditions.
  • the core material of an Example with a low airflow resistance index means that the gas flow resistance inside the core material is small and the core material has good air permeability and liquid permeability.

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PCT/JP2010/070439 2009-11-30 2010-11-17 吸水性材料の集合体を薄くする方法およびその方法によって得られる厚さの薄い吸水性材料の集合体 Ceased WO2011065262A1 (ja)

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US13/512,660 US20120231946A1 (en) 2009-11-30 2010-11-17 Method for thinning aggregate of water-absorbent material and thin aggregate of water-absorbent material obtained using the method
CN2010800540669A CN102630260A (zh) 2009-11-30 2010-11-17 将吸水性材料的集合体减薄的方法以及用该方法得到的厚度薄的吸水性材料的集合体
EP10833109.1A EP2508662B1 (en) 2009-11-30 2010-11-17 Method for reducing thickness of mass of water-absorbing material and thin mass of water-absorbing material obtained by the method
AU2010323772A AU2010323772A1 (en) 2009-11-30 2010-11-17 Method for reducing thickness of mass of water-absorbing material and thin mass of water-absorbing material obtained by the method

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JP6640899B2 (ja) * 2018-03-09 2020-02-05 第一衛材株式会社 液体吸収シートの製造装置
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EP2508662A1 (en) 2012-10-10
TW201200114A (en) 2012-01-01
US20120231946A1 (en) 2012-09-13
AU2010323772A1 (en) 2012-05-31
EP2508662B1 (en) 2014-09-10
EP2508662A4 (en) 2013-04-24
CN102630260A (zh) 2012-08-08
KR20120098729A (ko) 2012-09-05
JP5702928B2 (ja) 2015-04-15
JP2011117088A (ja) 2011-06-16

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