WO2018045939A1 - 一种具有导液通道的复合吸收芯体及其制备方法和应用 - Google Patents

一种具有导液通道的复合吸收芯体及其制备方法和应用 Download PDF

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Publication number
WO2018045939A1
WO2018045939A1 PCT/CN2017/100483 CN2017100483W WO2018045939A1 WO 2018045939 A1 WO2018045939 A1 WO 2018045939A1 CN 2017100483 W CN2017100483 W CN 2017100483W WO 2018045939 A1 WO2018045939 A1 WO 2018045939A1
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Prior art keywords
layer
liquid
absorbent core
water absorbing
composite absorbent
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PCT/CN2017/100483
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English (en)
French (fr)
Inventor
荣敏杰
田云
许永升
于庆华
荣帅帅
Original Assignee
山东诺尔生物科技有限公司
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Publication of WO2018045939A1 publication Critical patent/WO2018045939A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D35/00—Tools for shearing machines or shearing devices; Holders or chucks for shearing tools
    • B23D35/001—Tools for shearing machines or shearing devices; Holders or chucks for shearing tools cutting members
    • 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
    • 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
    • A61F13/534—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 having an inhomogeneous composition through the thickness of the pad
    • A61F13/535—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 having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes
    • 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
    • A61F13/534—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 having an inhomogeneous composition through the thickness of the pad
    • A61F13/537—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 having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
    • 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
    • A61F13/534—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 having an inhomogeneous composition through the thickness of the pad
    • A61F13/537—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 having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
    • A61F13/53708—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 having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer the layer having a promotional function on liquid propagation in at least one direction
    • 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
    • A61F13/534—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 having an inhomogeneous composition through the thickness of the pad
    • A61F13/537—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 having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
    • A61F13/53743—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 having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the position of the layer relative to the other layers
    • A61F13/53756—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 having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the position of the layer relative to the other layers the layer facing the back-sheet
    • 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
    • A61F13/534—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 having an inhomogeneous composition through the thickness of the pad
    • A61F13/537—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 having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
    • A61F13/5376—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 having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the performance of the layer, e.g. acquisition rate, distribution time, transfer time
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D17/00—Shearing machines or shearing devices cutting by blades pivoted on a single axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D17/00—Shearing machines or shearing devices cutting by blades pivoted on a single axis
    • B23D17/02—Shearing machines or shearing devices cutting by blades pivoted on a single axis characterised by drives or gearings therefor
    • B23D17/06—Shearing machines or shearing devices cutting by blades pivoted on a single axis characterised by drives or gearings therefor actuated by fluid or gas pressure
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
    • E02F3/965—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements of metal-cutting or concrete-crushing implements
    • 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
    • A61F2013/530481—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 having superabsorbent materials, i.e. highly absorbent polymer gel materials
    • 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
    • A61F2013/530481—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 having superabsorbent materials, i.e. highly absorbent polymer gel materials
    • A61F2013/530708—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 having superabsorbent materials, i.e. highly absorbent polymer gel materials characterized by the absorbency properties
    • 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
    • A61F13/534—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 having an inhomogeneous composition through the thickness of the pad
    • A61F13/537—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 having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
    • A61F2013/53765—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 having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterized by its geometry
    • A61F2013/53778—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 having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterized by its geometry with grooves

Definitions

  • the present invention relates to the field of composite absorbent cores, and in particular to a composite absorbent core having a flow guiding effect and an absorbent article comprising the core.
  • the composite absorbent core generally comprises a surface layer, a bottom layer and an intermediate layer disposed between the surface layer and the bottom layer, and the absorbent material is fixed on the surface of the intermediate layer by bonding or the like.
  • the absorbent core When the composite absorbent core is in contact with the liquid, the liquid passes through the surface layer to the intermediate layer, and is absorbed and held by the absorbent material fixed on the intermediate layer to function to absorb the liquid. Therefore, the amount of liquid absorbed by the absorbent core is determined by the amount of absorbent material and the absorbency.
  • the absorbent material is typically distributed between the skin layer and the intermediate layer and between the bottom layer and the intermediate layer.
  • the longitudinal permeation rate of the liquid from the surface layer to the bottom layer and the lateral diffusion rate along the surface of the composite absorbent core are slow, and the solution causes the liquid to accumulate excessively locally to cause side leakage or flooding.
  • CN201310359556.5 discloses a composite absorbent core comprising a surface layer, a bottom layer and an intermediate absorption layer disposed between the surface layer and the bottom layer, the intermediate absorption layer being opened There are a plurality of longitudinal perforations in which the polymer water absorbing resin is filled.
  • this composite absorbent core still does not solve the problem of slow lateral diffusion of liquid.
  • CN201310393117.6 discloses a composite absorbent core body and a diaper having a quick-absorbing function, wherein the composite absorbent core body is composed of a full-flowing surface layer, a slow-water-absorbing polymer layer, a medium-speed water-absorbing wood pulp cotton mixed layer and a high water absorption.
  • the molecular layers are composed in sequence.
  • the fully permeable surface layer of such a composite absorbent core merely accelerates the longitudinal penetration rate of the liquid.
  • sanitary articles such as baby diapers have been widely used, and such diapers including composite cores are expanding in market share due to ultra-thin and continuous layers, but absorbent articles including composite absorbent cores in the prior art are, for example,
  • the diaper also has the following defects: (1) The existing composite absorbent core type baby diaper has a slow absorption rate and a phenomenon of leakage of urine; (2) the existing composite absorbent core type diaper is absorbed by urine due to Yes The multi-layer dust-free paper and the non-woven fabric are composed, and the intermediate absorbent layer expands after absorbing urine to harden the composite absorbent core.
  • the technical problem to be solved by the present invention is to solve the problems that the composite absorbent core has a slow absorption speed, a large amount of back osmosis, a hardening after expansion, and an abrasion caused to the user.
  • the present invention provides, in a first aspect, a composite absorbent core having a flow guiding effect.
  • the invention also provides, in a second aspect, an absorbent article comprising the composite absorbent core.
  • the invention further provides a method of preparing the composite absorbent core in a third aspect.
  • the invention further provides, in a fourth aspect, the use of the composite absorbent core in the manufacture of an absorbent article.
  • the composite absorbent core body adopting the technology of the present invention has the following advantages: good dryness, no sputum, continuous layer, no expansion and hardening, and less amount of back oozing. Because it has a liquid-suction self-expanding liquid-conducting channel, it has a significant flow guiding effect after liquid absorption, so the liquid infiltration speed is fast, and the diffusion performance is also significantly better than the general composite absorbent core, which can be applied to various absorptions.
  • Figure 1 is a schematic view showing the structure of an embodiment of the composite absorbent core of the present invention, wherein the composite absorbent core is in a pre-absorbent state, and the position of the liquid-conducting passage is only faintly visible.
  • Figure 2 is a cross-sectional view of the composite absorbent core of Figure 1.
  • FIG. 3 is a schematic view showing the structure of another embodiment of the composite absorbent core of the present invention, wherein the composite absorbent core is in a pre-absorbent state, but the width of the liquid-conducting passage is larger than the width of the composite absorbent core in FIG.
  • Fig. 4 is a view showing that the composite absorbent core of Fig. 1 is swelled and the polymeric water absorbing resin is expanded to form a very obvious liquid guiding passage.
  • Figure 5 is a cross-sectional view of the composite absorbent core of Figure 4.
  • Figure 6 is a cross-sectional view showing still another embodiment of the composite absorbent core of the present invention, having only one water absorbing layer formed of a polymer water absorbing resin, and having no intermediate absorbing layer.
  • Fig. 7 is a schematic view showing the structure of the composite absorbent core of Fig. 6 after liquid absorption.
  • Figure 8 is a cross-sectional view showing still another embodiment of the composite absorbent core of the present invention, having an upper water absorbing layer and a lower water absorbing layer formed of a polymer water absorbing resin, but without an intermediate absorbing layer.
  • Figure 9 is a schematic view showing the structure of the composite absorbent core of Figure 8 after aspiration.
  • Figures 10 to 15 are a strip-shaped baffle placed parallel to the length of the bottom layer, an elongated baffle perpendicular to the length of the bottom layer, and a plurality of (3) elongated baffles perpendicular to the length of the bottom layer, Schematic diagram of the upper surface of the bottom layer of the S-line baffle, the Z-baffle and the T-shaped baffle and sprayed with the hot-melt structural adhesive.
  • 1 surface layer
  • 2 upper water absorption layer
  • 3 intermediate absorption layer
  • 4 lower water absorption layer
  • 5 bottom layer
  • 6 liquid guiding channel
  • 7 blank area (no distribution of polymer water absorbing resin and liquid guiding The area corresponding to the channel)
  • the invention provides a composite absorbent core body having a flow guiding effect in a first aspect, wherein the composite absorbent core body has a five-layer structure, and is a surface layer, an upper water absorbing layer, an intermediate absorbing layer, and a lower water absorbing layer from top to bottom. And the bottom layer; the upper water absorbing layer and/or the lower water absorbing layer are provided with a liquid guiding channel in the middle of the width of the entire composite absorbent core.
  • the shape and size of the composite absorbent core of the present invention are not particularly limited, and may be formed into different shapes and have a desired size as needed.
  • the composite absorbent core may be, for example, a cylinder, a cube, a rectangular parallelepiped or designed to have various shapes according to actual needs.
  • a rectangular sheet will be described below as an example. The thickness, width and length of the sheet can be based on Need to design.
  • the surface layer is the layer of the composite absorbent core on the liquid infiltration side and the bottom layer is the layer of the composite absorbent core on the side opposite the surface layer.
  • the surface layer is a layer close to one side of the body, and the bottom layer is a layer away from the side of the body.
  • the present invention has no particular limitation on the entire width of the composite absorbent core, and can be set, cut or spliced as needed.
  • the composite absorbent core has a width ranging from 8 cm to 15 cm, such as from 8 cm to 12 cm, such as 8, 9, 10, 11, 12, 13, or 14 cm.
  • the skin layer may be a woven cloth or a nonwoven fabric.
  • the material of the woven or nonwoven fabric may be made of fibers selected from the group consisting of polyethylene fibers, polypropylene fibers, polyvinyl chloride fibers, polyester fibers, cellulose fibers, A group of natural fibers or rayon.
  • the nonwoven fabric may be formed, for example, by hot air treatment, hot rolling treatment, spunbond treatment, hydroentangling treatment or air-laid molding process; the woven fabric may be made of, for example, a fiber by a weaving method. .
  • the material of the underlayer may be a polyethylene film or a polyvinyl chloride film.
  • the material of the underlayer is a gas permeable membrane, such as a polyethylene gas permeable membrane doped with inorganic particles or a polyvinyl chloride gas permeable membrane.
  • the intermediate absorbent layer may be a woven or nonwoven fabric.
  • the material of the woven or nonwoven fabric may be made of fibers selected from the group consisting of polyethylene fibers, polypropylene fibers, polyvinyl chloride fibers, polyester fibers, cellulose fibers, A group of natural fibers or rayon.
  • the nonwoven fabric may be formed, for example, by hot air treatment, hot rolling treatment, spunbond treatment, hydroentangling treatment or air-laid molding process; the woven fabric may be made of, for example, a fiber by a weaving method. .
  • the skin layer and/or the bottom layer has a square gram weight of from 10 g/m 2 to 90 g/m 2 (eg, 10, 20, 30, 40, 50, 60, 70 or 80 g/m 2 Or, for example, 10g/m 2 to 50g/m 2 ), preferably 35g/m 2 to 55g/m 2 of spunbonded nonwoven fabric or dust-free paper, or polyethylene fiber, polypropylene fiber, polyvinyl chloride fiber, One or more of polyester fiber, natural or rayon or cellulose fiber, or woven fabric formed by hot air, hot rolling, hydroentanglement, needle punching, spunbonding or air laying.
  • the intermediate absorbent layer has a square gram weight of from 15 g/m 2 to 80 g/m 2 (eg, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65,
  • a fluffy nonwoven fabric of 70 or 75 g/m 2 ) is, for example, a fluffy nonwoven fabric having a square gram weight of from 35 g/m 2 to 50 g/m 2 .
  • the SAP forming the water absorbing layer may be partially or wholly embedded in the fluffy nonwoven fabric before liquid absorption, and will be tightly embedded in the fluffy after the liquid swell is expanded.
  • the woven fabric it is possible to maintain the shape of the composite absorbent core after the liquid absorption, unlike the composite absorbent core of the prior art, which agglomerates and breaks due to changes in weight of the SAP particles or the like after the liquid absorption.
  • the ability of the composite absorbent core of the present invention to maintain shape after pipetting is particularly advantageous in the case of its use in diapers, because if the agglomeration or fault occurs, it may cause discomfort to the user and may even result in contact with the body. Compression or friction.
  • the upper water absorbing layer is a superabsorbent polymer (SAP) of 20 mesh to 120 mesh (for example, 20, 40, 60, 80, 100 or 120 mesh); and / Or the lower water absorbing layer is a polymer water absorbing resin of 20 mesh to 120 mesh (for example, 20, 40, 60, 80, 100 or 120 mesh).
  • SAP superabsorbent polymer
  • the lower water absorbing layer is a polymer water absorbing resin of 20 mesh to 120 mesh (for example, 20, 40, 60, 80, 100 or 120 mesh).
  • the polymer water absorbing resin used in the present application is known, and the SAP used in the water absorbing layer of the present invention is not particularly limited as long as it can swell after absorbing liquid and form a liquid guiding channel in a region where SAP is not distributed.
  • a polymer water absorbing resin of various properties can be purchased from Upper Frozen Biotech Co., Ltd. as needed.
  • the upper water absorbing layer and/or the lower water absorbing layer may have a square gram weight of from 80 g/m 2 to 300 g/m 2 (for example, 80, 100, 150, 200 , 250 or 300 g/ m 2 ).
  • the mesh distribution (D 50 ) of the particles having a mesh number of 50% or more of the SAP particles of the upper water absorbing layer is in the range of 25 mesh to 50 mesh; the mesh number of the SAP particles of the lower water absorbing layer is More than 80% of the particle mesh distribution (D 80 ) is in the range of 30 mesh to 100 mesh. If the particles of the polymer water absorbing resin are too large, the granules of the sanitary product may be strong and uncomfortable; if the granules are too small, more dust may be generated during the production of the sanitary ware.
  • the particle size ratio (linear expansion coefficient) of the SAP particles after aspiration and before pipetting may be from 20 to 100 (for example, 20, 30, 40, 50, 60, 70, 80, 90 or 100).
  • the height of the catheter is equivalent to the sum of the diameters of five 80-mesh SAP particles (particle size is about 0.180 mm, expansion ratio is 50)
  • the height of the liquid-conducting channel before the aspiration is about 0.90 mm.
  • the height after the liquid is about 45 mm, which is equivalent to a 50-fold increase in the liquid guiding effect.
  • the liquid guiding channel of the present invention is a liquid-absorbent self-expanding catheter channel, which is provided with a liquid-conducting channel between, for example, a water-absorbing layer and an intermediate layer without utilizing the property of absorbing and expanding the absorbing material to expand the channel. It is significantly different because the latter case does not have the ability to absorb and self-expand, so either a large size catheter is initially designed, thereby sacrificing the integrity, overall strength and aesthetics of the composite absorbent core. Either the initial setting of a smaller catheter channel leads to a significant lack of fluid guiding.
  • the pressurized absorption of the SAP at a pressure of 0.7 psi may be no less than 10 g/g, such as from 10 g/g to 26 g/g, such as 10, 15, 20, 25 g/g.
  • the SAP has a D 50 of from 25 mesh to 50 mesh (ie, 50% of the particles have a particle size in the range of 25 mesh to 50 mesh) or any subrange thereof, such as 25, 30, 35, 40, 45 or 50 mesh.
  • the D 80 of the SAP is from 30 mesh to 100 mesh (ie, 80% of the particles have a particle size in the range of 30 mesh to 100 mesh) or any subrange thereof, such as 30, 35, 40. , 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95 or 100 mesh.
  • the SAP particles within the particle size range allow the composite absorbent core to better form a liquid-conducting channel after the absorption liquid is expanded.
  • the vortex absorption rate of the SAP can be less than 85 seconds, such as less than 85, 60, 45, 20 seconds.
  • the test method of the vortex absorption rate is as follows: in a 100 mL beaker with a rotor, 0.9% physiological saline 50.0 ⁇ 0.5 g is placed, and the beaker is placed on a thermostatic magnetic stirrer, and stirred at a speed of 600 rpm, accurate Weigh 2.00 g of the polymer, put it into a vortex, and start timing with a stopwatch. When the vortex disappears and the liquid level becomes horizontal, the time (seconds) is recorded as the end point.
  • the temperature of the physiological saline is 25 ⁇ 2° C.; the beaker is a flat bottom beaker; the magnetic stirring rod has a diameter of 8 mm and a length of 30 mm.
  • the 16 hour LC content of the SAP is less than 15%, such as less than 14%, 13%, 12%, 11%, 10%, 9%, 8%, 7%, 6%, 5%. , 4%, 3%, 2% or 1%.
  • the test method for the 16-hour dissolution content is as follows: weigh 200 mL of physiological saline into a measuring cylinder, pour into a 250 mL beaker or conical flask; weigh about 1 g of SAP, put it into a conical flask, and record the weight m s of the weighed SAP; The physiological saline containing SAP was stirred at 250 ⁇ 50 rpm for 1 hour; the other 200 mL of physiological saline without SAP was stirred as a blank; the stirring was stopped to make the gel high.
  • the molecule was completely sunk into the bottom of the cup (placed for 10 minutes), and about 100 mL of the supernatant was suction filtered; 50 mL of the blank and the sample filtrate were separately weighed, titrated to a pH of 10 with a standard NaOH solution, and then titrated to pH with a standard hydrochloric acid solution. The value is 2.7 and the volume of the standard solution used is recorded.
  • n COOH (V NaOH, s - V NaOH, b ) c NaOH
  • V NaOH, s is the volume of standard NaOH solution required to filter the sample to pH 10
  • V NaOH, b is the volume of the standard NaOH solution required to set the blank filter to a pH of 10
  • c NaOH is the amount of the substance of the NaOH standard solution
  • V HCl, s is the volume of a standard HCl solution used to titrate the sample filtrate from pH 10 to pH 2.7;
  • V HCl, b is the blank filtrate from pH 10 to pH 2.7
  • the volume of the standard HCl solution used; c HCl is the amount of the substance of the HCl standard solution; the amount of sodium acrylate material is calculated as follows: n
  • the SAP of the upper water absorbing layer has a pressure absorption of more than 10 g/g at a pressure of 0.7 psi, and the particle size distribution of the particles of 50% or more ranges from 25 mesh to 50 mesh; the vortex absorption rate of the lower water absorbing layer SAP is less than At 85 seconds, 80% of the particles have a size distribution ranging from 30 mesh to 100 mesh, and the SAP has a 16 hour elution content of less than 15%.
  • the centrifugal water retention amount of the polymer water absorbing resin used in the upper water absorbing layer is higher than the centrifugal water retention amount of the lower water absorbing layer, and the polymer used in the upper water absorbing layer absorbs water.
  • the liquid absorption rate of the resin is slower than the liquid absorption rate of the lower water absorbing layer.
  • the upper water absorbing layer is fixed to the lower side of the surface layer by a hot melt structural adhesive layer; and/or the lower water absorbing layer is fixed to the upper side of the bottom layer by a hot melt structural adhesive layer.
  • the upper water absorbing layer and the lower water absorbing layer are provided with a liquid guiding passage at a substantially middle or middle position of the width of the entire composite absorbent core.
  • the upper water absorbing layer is provided with a liquid guiding channel in the middle of the width of the entire composite absorbent core, and no liquid guiding channel is disposed in the lower water absorbing layer.
  • the lower water absorbing layer is provided with a liquid guiding channel in the middle of the width of the entire composite absorbent core, and no liquid guiding channel is disposed in the upper water absorbing layer.
  • the present invention is not particularly limited in the number of the liquid guiding channels, and may be, for example, 1 to 4, for example, 1, 2, 3 or 4.
  • the shape of the liquid guiding channel of the present invention is also not particularly limited as long as the absorbed liquid can be diffused more rapidly.
  • the shape of the liquid guiding channel may be elongated, Z-shaped, S-shaped or well-shaped. Of course, these regions may have other shapes as long as the liquid can be rapidly diffused and the backflow can be reduced. In some preferred embodiments, it is preferably elongated or well-shaped from the viewpoint of the lateral diffusion speed of the liquid.
  • the shape of the inner cavity of the catheter is not particularly limited.
  • the cross-sectional shape of the catheter is V-shaped, trapezoidal, square, rectangular, semi-circular or elliptical.
  • the width of the liquid guiding passage of the composite absorbent core (i.e., the width of the blank area) is also not particularly limited.
  • the width of the liquid guiding passage is preferably from 0.5 cm to 4 cm, for example, 0.5, 1, 2, 3 or 4 cm. If the baffle is too narrow, the optimum liquid infiltration rate cannot be obtained; if the baffle is too wide, the polymer on both sides of the baffle layer is too thick, and the liquid absorption area of the water absorbing layer becomes small.
  • the size (ie, height) of the liquid-conducting channel of the composite absorbent core in the thickness direction is less than 1 cm, such as less than 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, before the liquid is absorbed. 0.2 or 0.1 cm, or even smaller. Therefore, such a shallow liquid guiding channel is not visible at all in appearance, and even without touching the touch or even feeling the presence of the liquid guiding channel. Conversely, in the case of using the same amount of SAP, if the height of the liquid guiding channel is set too large, the thickness of the composite absorbent core is excessively large, which affects the integrity, overall strength and appearance of the composite absorbent core.
  • the height of the catheter is guaranteed despite the composite absorbent core. Integrity, overall strength and appearance, but if the catheter is less than 1 cm before and after the high rate of liquid absorption before and after aspiration, then such height is likely to limit the conductivity of the catheter.
  • the water absorbing layer (upper water absorbing layer and/or lower water absorbing layer) of the composite absorbent core of the present invention is formed using SAP particles having a high degree of swelling after liquid absorption, and the liquid guiding channel of the composite absorbent core is disposed in the water absorbing layer. And the corresponding position where the liquid guiding channels are arranged in the water absorbing layer is not distributed with a water absorbing material such as SAP. That is, the liquid guiding channel is an area where no SAP is distributed, and for convenience of description, such a region is referred to as a blank area in the present invention.
  • the liquid-conducting channel of the composite absorbent core of the present invention has a self-expanding property after liquid absorption, and is a self-expanding liquid-conducting channel.
  • the composite absorbent core may omit the upper water absorbing layer and/or the intermediate layer, such that the composite absorbent core may have a three-layer structure, that is, a top layer, an upper water absorbing layer (or a lower water absorbing layer) from top to bottom. And the bottom layer, or a four-layer structure, that is, from top to bottom, respectively (1) surface layer, intermediate absorption layer, lower water absorption layer and bottom layer, or (2) surface layer, upper water absorption layer, intermediate absorption layer and bottom layer.
  • the invention provides, in a second aspect, an absorbent article comprising the composite absorbent core of the first aspect of the invention.
  • the absorbent article is a disposable hygiene article.
  • the disposable hygiene product is a sanitary napkin or a diaper.
  • the diaper may be of a prior art structure except for the composite absorbent core.
  • the diaper may include an innermost layer and an outermost layer sandwiching the composite absorbent core, an elastic waistband with a magic buckle at both ends, a three-dimensional leakproof guard on both sides, and the magic buckle A front waist veneer that fits together.
  • the composite absorbent core is used in a diaper, and the liquid guiding channel is elongated, more preferably perpendicular to the length of the absorbent core sheet and/or Or a strip of width such that the SAP absorbs the urine to form an elongated liquid-conducting channel perpendicular to the length and/or width of the sheet, and the sheet can be bent back and forth and/or left and right along the formed channel. Or fold.
  • the composite absorbent core can be reduced in the absorption or rubbing of the inside of the legs due to expansion after absorbing urine, thereby eliminating or reducing the conforming to the absorbent core.
  • the shape of the liquid guiding channel is elongated, and the composite absorbent core is formed to have an angle of not more than 60° after being freely bent left and right after liquid absorption.
  • a composite absorbent core having a flow guiding effect of the present invention has a five-layer structure, and the top layer is the top layer 1, the upper water absorbing layer 2, and the intermediate absorption layer. 3.
  • the lower water absorbing layer 4 is provided with a liquid guiding passage 6 in the middle of the width of the entire composite absorbent core.
  • the composite absorbent core has a full width of 8-15 cm, for example 8-12 cm.
  • the lower water absorbing layer 4 is provided with a liquid guiding passage 6 of, for example, 0.5-4 cm in width in the middle of the width of the entire composite absorbent core.
  • the width of the catheter channel can be designed as needed, either relatively small (as shown in Figure 2) or slightly larger (as shown in Figure 3).
  • Figure 1 is a schematic view showing the structure of an embodiment of the composite absorbent core of the present invention, wherein the composite absorbent core is in a pre-absorbent state, and the position of the liquid-conducting passage is only faintly visible.
  • FIG. 2 is a cross-sectional view of the composite absorbent core of Figure 1;
  • Figure 3 is a schematic view of another embodiment of the composite absorbent core of the present invention, wherein the composite absorbent core is in a pre-absorbent state, but the liquid-conducting channel The width of the composite absorbent core is larger than that of FIG. 1;
  • FIG. 4 is a schematic view of the composite absorbent core of FIG. 1 after the liquid absorbent resin is expanded to form a very obvious liquid guiding channel;
  • FIG. 5 is a composite of FIG. A cross-sectional view of the absorbent core.
  • Figure 2 is a cross-sectional view of the composite absorbent core of Figure 1.
  • the cross-sectional area of the composite absorbent core in the liquid-conducting channel 6 is small, and the thickness of the composite absorbent core at the position where the liquid-conducting channel 6 is located and the adjacent position (see The difference in thickness of FIGS. 1 to 3) is small, in the order of millimeters, which is equivalent to the sum of the diameters of several or several tens of polymer water absorbing resin particles before expansion, and does not affect the composite absorbent core or includes the composite absorbent core.
  • the packaging and aesthetics of the absorbent article of the body is a cross-sectional view of the composite absorbent core of Figure 1.
  • Figure 6 is a cross-sectional view showing still another embodiment of the composite absorbent core of the present invention, having only one water absorbing layer formed of a polymer water absorbing resin, and having no intermediate absorbing layer.
  • Such a composite absorbent core can also form a large cross-sectional area of the liquid guiding channel after liquid absorption (as shown in FIG. 7).
  • Figure 8 is a cross-sectional view showing still another embodiment of the composite absorbent core of the present invention, having an upper water absorbing layer and a lower water absorbing layer formed of a polymer water absorbing resin, but without an intermediate absorbing layer.
  • Such a composite absorbent core can also form a large cross-sectional area of the liquid guiding channel after liquid absorption (as shown in FIG. 9).
  • Figures 10 to 15 are a strip-shaped baffle placed parallel to the length of the bottom layer, an elongated baffle perpendicular to the length of the bottom layer, and a plurality of (3) elongated baffles perpendicular to the length of the bottom layer, Schematic diagram of the upper surface of the bottom layer of the S-line baffle, the Z-baffle and the T-shaped baffle and sprayed with the hot-melt structural adhesive.
  • the invention also provides, in a third aspect, a method of preparing the composite absorbent core of the first aspect of the invention, the method comprising the steps of:
  • the method of preparing the composite absorbent core of the first aspect of the invention may also include the following steps:
  • step (1) and step (2) may be performed simultaneously, or may be performed sequentially or in reverse order; step (4) and step (5) may be performed simultaneously, or sequentially or in reverse order; Step (1) and step (4) may be performed simultaneously, or sequentially or in reverse order; steps (2) and (5) may be performed sequentially or in reverse order; step (1) and step ( 5) may be performed simultaneously, or sequentially or in reverse order; steps (2) and (4) may be performed simultaneously, or sequentially or in reverse order; provided that step (3) must be in steps (1) and after step (2), and step (6) must be performed after step (4) and step (5).
  • the first liquid swellable material forming the upper water absorbing layer and/or the second liquid absorbing material forming the lower water absorbing layer may be discharged by at least one blanking roll.
  • the third baffle is placed in a region corresponding to the preset position of the liquid-conducting channel, and/or the second hot-melt structural adhesive layer is sprayed on the upper side of the bottom layer.
  • the baffle is aligned and rebonded.
  • the shape of the baffle should correspond to the shape and size of the catheter.
  • the liquid guiding passage is exemplified by an elongated liquid guiding passage having a width of 1 to 4 cm, and then the baffle should be an elongated baffle capable of forming a liquid guiding passage of 1 to 4 cm.
  • the surface layer is made of dust-free paper with a width of 9cm and a weight of 10g/m 2 .
  • the upper water-absorbing layer is made of a polymer weight-absorbing resin with a weight of 140g/m 2 and 20 mesh.
  • the intermediate absorption layer is made of a hot air fluffy and non-woven with a weight of 35g/m 2 .
  • the cloth and the lower water absorbing layer are made of a polymer water-absorbing resin having a weight of 140 g/m 2 and 40 mesh, and the bottom layer is a dust-free paper having a width of 9 cm and a basis weight of 10 g/m 2 ; the preparation steps are as follows:
  • the surface layer is made of dust-free paper with a width of 10cm and a weight of 30g/m 2 .
  • the upper water-absorbing layer is made of a polymer weight-absorbing resin with a weight of 140g/m 2 and 25 mesh, and the intermediate absorption layer is made of a hot air fluffy and non-woven with a weight of 45g/m 2 .
  • the cloth and the lower water absorbing layer are made of a polymer water-absorbing resin having a weight of 140 g/m 2 and 80 mesh, and the bottom layer is a dust-free paper having a width of 10 cm and a basis weight of 30 g/m 2 ; the preparation steps are as follows:
  • the surface layer is made of dust-free paper with a width of 11cm and a weight of 50g/m 2 .
  • the upper water-absorbing layer is made of a polymer weight-absorbing resin with a weight of 140g/m 2 and 32 mesh.
  • the intermediate absorption layer is made of a hot air and a fluffy non-woven fabric with a basis weight of 50g/m 2 .
  • the cloth and the lower water absorbing layer are made of a polymer water-absorbing resin having a weight of 140 g/m 2 and 120 mesh, and the bottom layer is a dust-free paper having a width of 11 cm and a basis weight of 50 g/m 2 ; the preparation steps are as follows:
  • the surface layer is made of dust-free paper with a width of 12cm and a weight of 20g/m 2 .
  • the upper water-absorbing layer is made of a polymer water-absorbing resin with a weight of 140g/m 2 and 34 mesh, and the intermediate absorption layer is made of a hot air fluffy and non-woven with a weight of 38g/m 2 .
  • the cloth and the lower water absorbing layer are made of a polymer water-absorbing resin having a weight of 140 g/m 2 and 120 mesh, and the bottom layer is a dust-free paper having a width of 12 cm and a gram weight of 20 g/m 2 ; the preparation steps are as follows:
  • the surface layer is made of dust-free paper with a width of 8cm and a weight of 30g/m 2 .
  • the upper water-absorbing layer is made of a polymer water-absorbing resin with a weight of 110g/m 2 and 33 mesh, and the intermediate absorption layer is made of a hot air fluffy and non-woven with a weight of 38g/m 2 .
  • the cloth and the lower water absorbing layer are made of a polymer water-absorbing resin having a weight of 140 g/m 2 and 108 mesh, and the bottom layer is a dust-free paper having a width of 12 cm and a basis weight of 20 g/m 2 ; the preparation steps are as follows:
  • the long baffle is placed so that the lower absorbent layer is not sprinkled at the position where the intermediate portion of the upper portion is left with a gap.
  • the absorption core absorbs the liquid
  • the polymer water absorbing resin constituting the upper absorption layer and the absorption layer expands, thereby forming the liquid guiding passage 6 at a position where the lower water absorbing layer is not sprinkled, thereby allowing liquid leakage
  • the time is shortened and the diffusion length of the composite absorbent core is preferably improved.
  • a composite absorbent core (i.e., a normal core) was prepared in substantially the same manner as in Example 1, except that no liquid guiding channels (i.e., grooves) were formed.
  • the cores prepared in the above Examples 1 and 2 were cut into a 38X 10 cm gauge, and the composite absorbent core of the present invention was tested, and Comparative Example 1 was used as a control.
  • the test method is that the composite absorbent core of the present invention is placed with a stainless steel ring (inner diameter 50 mm, outer diameter 60 mm, weight 320 g, cylinder height 5 cm), and 80 ml of physiological saline is added each time, at intervals of 10 minutes, a total of liquid is added. Three times; the back osmosis was tested in the 30th minute (the pressure weight was 10 cm, the weight was 12 kg, and the filter paper was neutral medium speed filter paper). See Table 1 below for the results.
  • the composite absorbent core of the present invention with a liquid guiding channel has significant advantages in terms of absorption speed and back bleed.
  • a composite absorbent core was prepared in substantially the same manner as in Example 1, except that a liquid guiding passage having a width of 3.5 cm was formed; the surface layer was made of dust-free paper having a basis weight of 40 g/m 2 , and the upper water-absorbing layer was made of a weight of 140 g. /m 2 , water-absorbent resin with a particle size of 20 mesh to 50 mesh; a lower water-absorbing layer using a polymer water-absorbent resin having a gram weight of 140 g/m 2 and a particle diameter of 20 mesh to 50 mesh; and a bottom weight of 40 g/m 2 Dust-free paper; in step 1), the glue sprayer sprays a 1.5 g/m 2 hot-melt structural adhesive layer.
  • a composite absorbent core (i.e., a normal core) was prepared in substantially the same manner as in Example 6, except that no liquid guiding channels (i.e., grooves) were formed.
  • the first dosing started, the time was recorded as 0, the amount of liquid added was 60 mL of physiological saline per time, the temperature was 23 °C ⁇ 2 °C, and the liquid diffusion length was measured at the 4th minute, and the measurement was performed with a scale.
  • the second addition was performed at the 5th minute, the second diffusion length measurement was performed at the 9th minute, and the first back osmosis measurement was performed at the 10th minute.
  • the third addition was performed at the 12th minute, the third diffusion length measurement was performed at the 21st minute, and the second back osmosis measurement was performed at the 22nd minute.
  • the fourth addition was performed at the 24th minute, the 4th diffusion length measurement was performed at 33 minutes, and the third back osmosis measurement was performed at the 34th minute.
  • the liquid adding method is to add liquid by adding a liquid adding device with an inner diameter of 2.4 cm, a lower plate, and a flat plate on both sides, and each weight is 0.6 kg, and the weighting device is added with a weight.
  • the total weight is 2kg, and the absorption speed, that is, the infiltration time, is the time when the liquid is completely infiltrated after adding liquid.
  • the test method of back leaching is to press the filter paper on the surface of the diaper after the liquid absorption with 1.25kg weight, press for 1 minute, weigh The difference in the quality of the filter paper before and after the pressure measurement is the amount of back bleed. See Table 2 below for the results.
  • each time point is counted as 0 min minutes at the beginning of the test; the absorption time is the time required for complete absorption (s); the diffusion distance is the distance (cm) at which the liquid diffuses at the test time point; the amount of back-drain is the back-drain at the test time point Quantity (g).
  • Examples 7 and 8 were carried out in the same manner as in Example 6 except that the upper water absorbing layer and the lower water absorbing layer were formed using SAP particles each having a pressure absorption amount of 10 and 20, respectively.
  • Examples 9 and 10 were carried out in the same manner as in Example 6 except that the upper water absorbing layer and the lower water absorbing layer were formed using SAP particles having vortex absorption rates of 85 and 60, respectively.
  • Examples 11 and 12 were carried out in the same manner as in Example 6 except that the upper water absorbing layer and the lower water absorbing layer were formed using SAP particles having an eluted content of 15% and 10%, respectively.
  • Examples 15 to 16 were carried out in the same manner as in Example 6 except that the SAP particles having a mesh number (D 50 ) of 20 and 120, respectively, were used to form the upper water absorbing layer and the lower water absorbing layer.
  • Examples 17 to 20 were carried out in the same manner as in Example 6 except that the upper water absorbing layer and the lower water absorbing layer were formed using SAP particles having expansion ratios of 10, 20, 100 and 150, respectively.
  • the absorption velocities measured at 24 minutes of the composite absorbent cores prepared in Examples 17 to 20 and Comparative Example 1 were measured in the same manner as in Example 6 (i.e., the time required for complete infiltration (s)), The diffusion length (cm) measured at 33 min and the amount of back bleed (g) measured at 34 min, and the percentage reduction (%) required for complete infiltration of the core of each of the core examples of Comparative Example 1 was calculated. % of diffusion length increase (%) and percent decrease of backflow (%).
  • the amount of pressure absorption is the amount of pressure absorption at a pressure of 0.7 psi. See Table 3 below for the results.
  • the absorption speed measured at 24 minutes (the time required for complete infiltration (s)) and the diffusion measured at 33 minutes were measured in the same manner as in Example 6 in the same manner as in Example 6.
  • the amount of pressure absorption shown in the table represents the amount of pressure absorption at a pressure of 0.7 psi; the expansion ratio is a ratio of the particle diameter of the SAP particles after saturation absorption of physiological saline to the particle diameter before absorption.
  • the eluate content represents the 16 hour eluate content.
  • the detection method is as described above.
  • the composite absorbent core obtained by the preferred embodiment of the present invention significantly increases the liquid infiltration rate, and the infiltration speed can be increased by 50% to 90%; meanwhile, the diffusion length of the liquid can be increased by 10 % to about 30%; in addition, the amount of back-seepage can be reduced by about 10% to 80%.
  • a composite absorbent core was prepared in substantially the same manner as in Example 6 except for the contents shown in Table 4 and Table 5 below, and then formed into a diaper including the innermost layer sandwiching the composite absorbent core therein. And the outermost layer, the elastic waistband with the magic buckle on both ends, the three-dimensional leakage protection on both sides, and the front waist veneer that can be used with the magic buckle.
  • the three types of SAP used were purchased from Shandong Noor Biotechnology Co., Ltd., and their relevant properties are shown in Table 5 below.
  • the absorption speed of SAP can be static or rotor
  • the rest time means that the shorter the time, the faster the absorption speed.
  • the 511 type SAP has the slowest absorption rate
  • the 610S type SAP has the fastest absorption rate
  • the 610 type SAP has the highest absorption rate.
  • the centrifugal water retention of the 511 type SAP is relatively high, higher than the 610S type and the 610 type SAP, and the latter two have the same centrifugal water retention.
  • the diaper was tested for absorption, diffusion and reflow performance according to the method described in Example 6. The results are shown in Table 6 below.
  • Example 21 Example 22
  • Example 23 Core mass (g) 23.63 23.21 23.17 0min absorption / s 7 7 8 5min absorption / s 30 12 11 12min absorption / s 38 12 10 24min absorption / s 33 12 9 4min diffusion / cm 20.0 21.0 21.1 9min diffusion / cm 20.0 23.5 24.0 21min diffusion / cm 23.5 24.8 27.0 33min diffusion / cm 26.5 29.0 31.0 10min back osmosis / g 0.10 0.09 0.15 22min back osmosis / g 1.63 0.87 2.66
  • Example 22 having the liquid-conducting passage was also the same as that of the upper water-absorbing layer using the 511 type SAP, the lower water-absorbing layer using the combination of the 610S-type SAP, and the examples 21 and 22.
  • the liquid infiltration rate of the core is faster (absorption time (seconds (s)), referring to the liquid infiltration time, the shorter the time, the faster the infiltration rate), the longer the diffusion length, and the lower the amount of backflow.
  • the diaper made of such a composite absorbent core has a low back osmosis amount and good dryness (as shown in the data of Example 22); if both the upper water absorbing layer and the lower water absorbing layer are absorbed
  • the 610 type SAP is as fast as the centrifuged water retention amount, although the SAP absorption rate of the upper water absorption layer is faster than that of the SAP used in the embodiment 22, the amount of backflow is relatively high.
  • the composite absorbent core prepared by the method of the invention has the following advantages: good dryness, no sputum, continuous layer, because of the flow guiding effect, the liquid infiltration speed is fast, and the diffusion performance is superior to the general composite absorbent core. It can be applied to various absorbent articles such as sanitary articles such as sanitary napkins, especially ultra-thin baby diapers, baby diapers and the like.

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Abstract

一种具有导液通道（6）的复合吸收芯体及其制备方法和应用，复合吸收芯体自上而下依次包括表层（1）、中间层和底层（5），中间层包括由吸收液体后膨胀的吸液膨胀性材料制成的吸水层，并且在吸水层中设置有吸液自扩张式导液通道（6）。该复合吸收芯体具有干爽性好、不起坨、不断层、膨胀不变硬等优点，由于导液通道（6）具有吸液自扩张特性，使得复合吸收芯体或者包括该芯体的吸收制品还具有液体下渗和扩散速度快和返渗量少等优点。

Description

一种具有导液通道的复合吸收芯体及其制备方法和应用 技术领域
本发明涉及复合吸收芯体领域，具体涉及一种具有导流效果的复合吸收芯体以及包括该芯体的吸收制品。
背景技术
在现有技术中，复合吸收芯体一般包括表层、底层和设置于表层和底层之间的中间层，并通过粘接等方式把吸收性材料固定在中间层的表面上。当复合吸收芯体接触到液体时，液体通过表层到达中间层，被固定在中间层上的吸收性材料所吸收和保持，起到吸收液体的作用。因此，吸收芯体可吸收液体的量是由吸收性材料的量和吸收性能决定。在这种结构中，由于吸收性材料通常分布在表层与中间层之间以及底层与中间层之间。但是，在这种结构中，液体从表层向底层的纵向渗透速度以及沿着复合吸收芯体表面的横向扩散速度较慢，溶液导致液体在局部积累过多而导致侧漏或者淹渍。
为了解决纵向渗透速度偏慢的问题，CN201310359556.5公开了一种复合吸收芯体，包括表层、底层和设置于所述表层和所述底层之间的中间吸收层，所述中间吸收层上开设有多个纵向穿孔，在所述纵向穿孔中填充有高分子吸水树脂。但是这种复合吸收芯体仍然没有解决液体横向扩散速度偏慢的问题。
CN201310393117.6公开了一种具有瞬吸功能的复合吸收芯体及纸尿裤，所述复合吸收芯体由全导流表层、慢速吸水高分子层、中速吸水木浆棉混合层和快速吸水高分子层依序组成。但是这种复合吸收芯体的全导流表层也只是加快液体的纵向渗透速度。
目前婴儿纸尿裤等卫生用品得到了广泛的应用，包括复合芯体的这类纸尿裤由于超薄，不断层，因此市场份额也在不断扩大，但是现有技术中的包括复合吸收芯体的吸收制品例如纸尿裤还存在如下缺陷：(1)现有的复合吸收芯体类型婴儿纸尿裤多次吸收速度慢，有漏尿现象发生；(2)现有的复合吸收芯体类型纸尿裤在吸收尿液后，由于是 多层无尘纸和无纺布组成，中间吸收层在吸收尿液后膨胀会使复合吸收芯体变硬。
发明内容
(一)要解决的技术问题
本发明要解决的技术问题是解决复合吸收芯体吸收速度慢、返渗量多、吸液后膨胀变硬以及膨胀导致对使用者造成的磨损等问题。
(二)技术方案
为了解决上述技术问题，本发明在第一方面提供了一种具有导流效果的复合吸收芯体。
本发明在第二方面还提供了一种包括所述复合吸收芯体的吸收制品。
本发明在第三方面进一步提供了所述复合吸收芯体的制备方法。
本发明在第四方面进一步提供了所述复合吸收芯体在制造吸收制品中的应用。
(三)有益效果
与现有技术相比较，采用本发明技术的复合吸收芯体具有如下优点：干爽性好、不起坨、不断层、不膨胀变硬并且返渗量少。因为设置有吸液自扩张式的导液通道，因此在吸液后具有显著的导流作用，所以液体下渗速度快，扩散性能也显著优于一般复合吸收芯体，可以应用于各种吸收制品，尤其是卫生用品，特别是一次性卫生用品，例如卫生巾或者纸尿裤如超薄的婴儿纸尿裤、婴儿纸尿片等。
附图说明
图1是本发明的复合吸收芯体的一个实施例的结构示意图，其中复合吸收芯体为吸液前状态，并且导液通道的位置仅仅隐约可见。
图2是图1所示的复合吸收芯体的剖面图。
图3是本发明的复合吸收芯体的另一个实施例的结构示意图，其中复合吸收芯体为吸液前状态，但是导液通道的宽度比图1中的复合吸收芯体的宽度大。
图4是图1的复合吸收芯体吸液后高分子吸水树脂膨胀从而形成非常明显的导液通道。
图5是图4中的复合吸收芯体的剖面图。
图6是本发明的复合吸收芯体的又一个实施例的剖面图，仅有一个由高分子吸水树脂形成的吸水层，并且没有中间吸收层。
图7是图6所述的复合吸收芯体吸液后的结构示意图。
图8本发明的复合吸收芯体的又一个实施例的剖面图，有由高分子吸水树脂形成的上吸水层和下吸水层，但是没有中间吸收层。
图9是图8所述的复合吸收芯体吸液后的结构示意图。
图10至15是分别放有平行于底层长度方向的一个长条形挡板、垂直于底层长度的一个长条形挡板、垂直于底层长度的多个(3个)长条形挡板、S行挡板、Z挡板和井字形挡板并且喷敷热熔结构胶的底层上表面的示意图。
图中：1：表层；2：上吸水层；3：中间吸收层；4：下吸水层；5：底层；6：导液通道；7：空白区(没有分布高分子吸水树脂的与导液通道对应的区域)
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明在第一方面提供了一种具有导流效果的复合吸收芯体，所述复合吸收芯体为五层结构，自上而下分别为表层、上吸水层、中间吸收层、下吸水层和底层；所述上吸水层和/或下吸水层在整幅复合吸收芯体宽度的中部设有导液通道。
本发明对复合吸收芯体的形状和尺寸没有特别的限制，可以根据需要而形成不同的形状并且具有所需的尺寸。例如，对形状而言，复合吸收芯体可以为例如圆柱体、正方体、长方体或者根据实际需要而设计成具有各种不同的形状。为了便于描述，如果无有特别说明，下文将以长方形片材为例进行描述。片材的厚度、宽度和长度可以根据 需要来设计。
关于所述复合吸收芯体的表层和底层，如没有相反指示，表层为复合吸收芯体的位于液体渗入侧的层，底层为复合吸收芯体的位于与所述表层相对侧的层。以用于纸尿裤的复合吸收芯体为例，表层为靠近身体一侧的层，底层为远离身体一侧的层。
本发明对所述复合吸收芯体的整幅宽度没有特别的限制，可以根据需要设定、裁剪或拼接。在一些实施方式中，所述复合吸收芯体整幅宽度为8cm至15cm，例如为8cm至12cm，例如为8、9、10、11、12、13或14cm。
所述表层可以为织造布或者非织造布。在一些优选的实施方式中，所述织造布或者非织造布的材料可以由纤维制成，所述纤维选自由聚乙烯纤维、聚丙烯纤维、聚氯乙烯纤维、聚酯纤维、纤维素纤维、天然纤维或者人造纤维组成的组。所述非织造布例如可以采用热风处理、热轧处理、纺粘处理、水刺处理或空气铺网成型工艺将所述纤维制成；所述织造布例如可以通过织造方法利用所述纤维制成。
所述底层的材料可以为聚乙烯薄膜或者聚氯乙烯薄膜。优选的是，所述底层的材料是透气膜，例如为掺杂有无机物颗粒的聚乙烯透气膜或者聚氯乙烯透气膜。
所述中间吸收层可以为织造布或者非织造布。在一些优选的实施方式中，所述织造布或者非织造布的材料可以由纤维制成，所述纤维选自由聚乙烯纤维、聚丙烯纤维、聚氯乙烯纤维、聚酯纤维、纤维素纤维、天然纤维或者人造纤维组成的组。所述非织造布例如可以采用热风处理、热轧处理、纺粘处理、水刺处理或空气铺网成型工艺将所述纤维制成；所述织造布例如可以通过织造方法利用所述纤维制成。
在另外一些优选的实施方式中，所述表层和/或底层是平方克重为10g/m2至90g/m2(例如10、20、30、40、50、60、70或80g/m2或者例如10g/m2至50g/m2)，优选为35g/m2至55g/m2的纺粘无纺布或无尘纸，或者由聚乙烯纤维、聚丙烯纤维、聚氯乙烯纤维、聚酯纤维、天然或人造棉或纤维素纤维中的一种或几种经过热风、热轧、水刺、针刺、纺粘或空气铺网成型形成的无纺布或者纺织布。
在另一些实施方式中，所述中间吸收层为平方克重在15g/m2至80g/m2(例如15、20、25、30、35、40、45、50、55、60、65、70或75g/m2)的蓬松无纺布，例如为平方克重在35g/m2至50g/m2的蓬松无纺布。在中间吸收层是蓬松无纺布的情况下，形成吸水层的SAP在吸液前可以部分或者全部地包埋在蓬松无纺布中，并且在吸液膨胀后会紧紧地嵌在蓬松无纺布中，从而能够在吸液后维持复合吸收芯体的形状，而不像现有技术中的复合吸收芯体那样在吸液后由于SAP颗粒因重量变化等原因而发生团聚和断层。本发明的复合吸收芯体在吸液后能够维持形状的性能在其用于纸尿裤的情况下尤为有利，因为如果发生所述团聚或断层的话会引起使用者的不适甚至会导致与身体接触部位的压迫或摩擦。
在一些优选的实施方式中，所述上吸水层为20目至120目(例如为20、40、60、80、100或120目)的高分子吸水树脂(Super Absorbent Polymer，SAP)；和/或所述下吸水层为20目至120目(例如为20、40、60、80、100或120目)的高分子吸水树脂。
本申请使用的高分子吸水树脂都是已知的，并且本发明对吸水层使用的SAP没有特别的限制，只要在吸收液体后能够膨胀并且在没有分布SAP的区域形成导液通道即可。例如可以根据需要从上冻诺尔生物技术有限公司购得各种性能的高分子吸水树脂。
在另一些优选的实施方式中，所述上吸水层和/或下吸水层的平方克重可以为80g/m2至300g/m2(例如为80、100、150、200、250或300g/m2)。另外优选的是，所述上吸水层的SAP颗粒的目数为50％以上的颗粒的目数分布(D50)在25目到50目范围；所述下吸水层的SAP颗粒的目数为80％以上的颗粒目数分布(D80)在30目到100目范围。如果所述高分子吸水树脂的颗粒过大，则可能会造成卫生用品颗粒感强，不舒服；如果颗粒过小，卫生用品生产过程中会产生较多扬尘。
优选的是，SAP颗粒吸液后和吸液前的粒径比(线膨胀系数)可以为20至100(例如为20、30、40、50、60、70、80、90或100)。例如，如果导液通道的高度相当于5个80目的SAP颗粒(粒径为约0.180mm，膨胀率为50)的直径之和，则吸液前导液通道的高度约为0.90mm，吸 液后的高度为约45mm，相当于导液效果提高了50倍。因此，本发明的导液通道为吸液自扩张式导液通道，其与在例如吸水层与中间层之间设置导液通道而没有利用吸收材料吸液膨胀的特性来扩张导液通道的情况是显著不同的，因为后一种情况的导液通道没有吸液自扩张的能力，于是要么初始设计大尺寸的导液通道，由此牺牲了复合吸收芯体的整体性、整体强度和美观，要么是初始设置较小的导液通道，从而导致导液效果明显不足。
在一些优选的实施方式中，SAP的0.7psi压力下的加压吸收量可以为不低于10g/g，例如为10g/g至26g/g，例如为10、15、20、25g/g。
在一些优选的实施方式中，SAP的D50为25目到50目(即50％的颗粒的粒径处在25目到50目的范围)或其任意子范围，例如为25、30、35、40、45或50目。在另外一些优选的实施方式中，SAP的D80为30目到100目(即80％的颗粒的粒径处在30目到100目的范围)或其任意子范围，例如为30、35、40、45、50、55、60、65、70、75、80、85、90、95或100目。处在所述粒径范围内的SAP颗粒可以使得复合吸收芯体在吸收液体膨胀后能够更好地形成导液通道。
在一些优选的实施方式中，SAP的漩涡法吸收速度可以为小于85秒，例如小于85、60、45、20秒。漩涡法吸收速度的测试方法如下：在带有转子的100mL烧杯中，装入0.9％的生理盐水50.0±0.5g，将烧杯放在恒温磁力搅拌机上，以600转/分的速度进行搅拌，准确称取2.00g的高分子，投入到漩涡中，同时用秒表开始计时，当漩涡消失，液面成为水平状态时，作为终点，记录其时间(秒)。取3个样测试，取3个样的平均值作为测定结果，精确至一位小数。其中，生理盐水的温度为25±2℃；烧杯为平底烧杯；磁力搅拌棒直径为8mm，长度为30mm。
在一些优选的实施方式中，SAP的16小时溶出物含量小于15％，例如小于14％、13％、12％、11％、10％、9％、8％、7％、6％、5％、4％、3％、2％或1％。16小时溶出物含量的测试方法如下：用量筒称量200mL生理盐水，倒入250mL烧杯或锥形瓶中；称量约1g SAP，放入锥形瓶中，记录称取SAP的重量ms；将盛有SAP的生理盐水在250±50转/分钟的转速下搅拌1小时；将另一个盛有200mL不加SAP 的生理盐水做同样搅拌处理，作为空白样；停止搅拌，使凝胶的高分子完全沉入杯底(放置10分钟)，抽滤约100mL上清液；分别量取50mL空白样和样品的滤液，用标准NaOH溶液滴定到pH值为10，然后用标准盐酸溶液滴定到pH值为2.7，记录所用标准溶液的体积。羧酸物质的量nCOOH计算：nCOOH＝(VNaOH,s–VNaOH,b)cNaOH；VNaOH,s为将样品滤液滴定到pH为10需要的标准NaOH溶液的体积；VNaOH,b为将空白滤液滴定到pH为10所需的标准NaOH溶液的体积；cNaOH为NaOH标准溶液的物质的量浓度；全部羧酸根物质的量ntot计算：ntot＝(VHCl,s–VHCl,b)cHCl；VHCl,s为将样品滤液从pH为10滴定到pH为2.7所用的标准HCl溶液的体积；VHCl,b为将空白滤液从pH为10滴定到pH为2.7所用的标准HCl溶液的体积；cHCl为HCl标准溶液的物质的量浓度；丙烯酸钠物质的量计算如下：nCOONa＝ntot–nCOOH；丙烯酸和丙烯酸钠的质量mCOOH和mCOONa计算如下：mCOOH＝nCOOH×MCOOH×Fdl；mCOONa＝nCOONa×MCOONa×Fdl；MCOOH为丙烯酸的摩尔质量，等于72g/mol；MCOONa为丙烯酸钠的摩尔质量，等于94g/mol；Fdl为稀释指数，等于200/50＝4；可溶物含量w以质量分数表示为：w＝(mCOOH+mCOONa)/m_s×100；ms为测试SAP样品的质量。平行测试两个样品求平均值。
在一些更优选的实施方式中，使用至少2类不同的指标的SAP。例如，上吸水层的SAP在0.7psi压力下的加压吸收量高于10g/g，50％以上的颗粒的粒径分布范围为25目到50目；下吸水层SAP的漩涡法吸收速度小于85秒，80％的颗粒的尺寸分布范围为30目到100目，SAP的16小时溶出物含量小于15％。
在另外一些特别优选的实施方式中，所述上吸水层所使用的高分子吸水树脂的离心保水量高于所述下吸水层的离心保水量，并且所述上吸水层所使用的高分子吸水树脂的液体吸收速度慢于所述下吸水层的液体吸收速度。上吸水层和下吸水层采用这样的SAP组合时，可以显著降低吸液后的液体返渗量。
在一些实施方式中，所述上吸水层通过热熔结构胶层固定在所述表层的下侧面；和/或所述下吸水层通过热熔结构胶层固定在所述底层的上侧面。
关于所述导液通道的设置位置，在另外一些实施方式中，所述上吸水层和所述下吸水层在整幅复合吸收芯体宽度的大致中部或者中部位置设有导液通道。在另外一些实施方式中，所述上吸水层在整幅复合吸收芯体宽度的中部设有导液通道，而在所述下吸水层中不设置有导液通道。在一些优选的实施方式中，所述下吸水层在整幅复合吸收芯体宽度的中部设有导液通道，而在所述上吸水层中不设置有导液通道。
本发明对所述导液通道的数量没有特别的限制，例如可以为1至4条，例如为1、2、3或4条。
本发明对所述导液通道的形状也没有特别的限制，只要能够让吸收的液体更快速地扩散即可。例如，所述导液通道的形状可以为长条状、Z形状、S形状或井字形。当然，这些区域也可以具有其他的形状，只要能够使液体能够迅速扩散并且减少返渗即可。在一些优选的实施方式中，从液体横向扩散速度的角度考虑，优选为长条形或井字形。
本发明对所述导液通道的内腔的形状没有特别的限制，例如，所述导液通道的横截面形状为V字形、梯形、正方形、长方形、半圆形或椭圆形。
本发明对所述复合吸收芯体的导液通道的宽度(即空白区的宽度)也没有特别限制。在所述复合吸收芯体用于纸尿裤的情况下，导液通道的宽度优选为0.5cm至4cm，例如为0.5、1、2、3或4cm。如果挡板太窄，无法获得最佳的液体下渗速度；如果挡板太宽，会造成导流层两侧高分子过厚，以及吸水层的液体吸收面积变小。
在一些实施方式中，在未吸收液体前，复合吸收芯体的导液通道在厚度方向上的尺寸(即高度)小于1cm，例如为小于0.9、0.8、0.7、0.6、0.5、0.4、0.3、0.2或0.1cm，或者甚至更小。因此，这么浅的导液通道从外观上是根本看不出来的，甚至不仔细按压触摸甚至感觉不到导液通道的存在。相反，在使用同量SAP的情况下，如果将导液通道的高度设置过大，会导致复合吸收芯体的厚度过大，影响复合吸收芯体的整体性、整体强度和外观。
不难理解的是，导液通道的这样高度尽管保证了复合吸收芯体的 整体性、整体强度和外观，但是如果导液通道在吸液前后高度吸液前后均为小于1cm的话，那么这样的高度很可能限制了导液通道的导液能力。
然而，本发明的复合吸收芯体的吸水层(上吸水层和/或下吸水层)使用具有吸液后高度膨胀的SAP颗粒来形成，将复合吸收芯体的导液通道布置在吸水层中，并且在吸水层中布置导液通道的相应位置没有分布吸水材料例如SAP。即，导液通道为没有分布SAP的区域，为方便描述目的，这样的区域在本发明中称为空白区。由于SAP颗粒在吸液后高度膨胀，从而使得吸液后导液通道的高度(复合吸收芯体在厚度方向上的尺寸)会显著增大，从而显著地提高了导液通道的导液效果。换言之，本发明的复合吸收芯体的导液通道具有吸液后自扩张特性，是一种自扩张式导液通道。从而既保证了复合吸收芯体在吸液前(例如产品销售阶段)的整体性、整体强度和外观，又保证了在吸液后具有足够的吸液导流效果。
在一些实施方式中，复合吸收芯体可以省略上吸水层和/或中间层，使得复合吸收芯体可以为三层结构，即自上而下分别为表层、上吸水层(或下吸水层)和底层，或者为四层结构，即自上而下分别为(1)表层、中间吸收层、下吸水层和底层，或(2)表层、上吸水层、中间吸收层和底层。
本发明在第二方面提供了一种吸收制品，所述吸收制品包括本发明第一方面所述的复合吸收芯体。在一些优选的实施方式中，所述吸收制品为一次性卫生用品。在进一步优选的实施方式中，所述一次性卫生用品为卫生巾或纸尿裤。
以所述吸收制品为纸尿裤的情况为例，所述纸尿裤除了所述复合吸收芯体之外，其他部分均可以采用现有技术的结构。例如，纸尿裤可以包括将所述复合吸收芯体夹在其中的最内层和最外层、两端带有魔术扣贴的弹性腰围、两侧的立体防漏护围以及能够与所述魔术扣贴配合使用的前腰贴面。
在一些更优选的实施方式中，所述复合吸收芯体用于纸尿裤，并且导液通道为长条形，更优选为在垂直于符合吸收芯体片材的长度和/ 或宽度的长条形，使得SAP吸收尿液膨胀后形成垂直于片材的长度和/或宽度的长条形导液通道，片材能够沿着所形成的导液通道前后和/或左右弯曲或折叠。在沿着垂直于片材宽度的导液通道相对于身体左右弯曲的情况下，可以减少复合吸收芯体吸收尿液后因膨胀对双腿内侧的挤压或摩擦，从而消除或者减少符合吸收芯体膨胀造成的不适；在沿着垂直于片材长度的导液通道前后弯曲的情况下，可以减少复合吸收芯体膨胀造成明显的前后鼓胀造成的不适或不美观。在一些更优选的实施方式中，所述导液通道的形状为长条状，并且复合吸收芯体在吸液后能够左右自由弯曲后形成的角度为不大于60°。
下文将参照附图对本发明进行进一步的说明。
参照图1，其中示出了本发明的一种具有导流效果的复合吸收芯体，该复合吸收芯体为五层结构，自上而下分别为表层1、上吸水层2、中间吸收层3、下吸水层4和底层5。所述下吸水层4在整幅复合吸收芯体宽度的中部设有导液通道6。
所述复合吸收芯体的整幅宽度为8-15cm，例如为8-12cm。所述下吸水层4在整幅复合吸收芯体宽度的中部设有例如0.5-4cm宽的导液通道6。导液通道的宽度可以根据需要设计，可以相对较小一些(如图2所示)，也可以稍大一些(如图3所示)。
图1是本发明的复合吸收芯体的一个实施例的结构示意图，其中复合吸收芯体为吸液前状态，并且导液通道的位置仅仅隐约可见。
图2是图1所示的复合吸收芯体的剖面图；图3是本发明的复合吸收芯体的另一个实施例的结构示意图，其中复合吸收芯体为吸液前状态，但是导液通道的宽度比图1中的复合吸收芯体的宽度大；图4是图1的复合吸收芯体吸液后高分子吸水树脂膨胀从而形成非常明显的导液通道；图5是图4中的复合吸收芯体的剖面图。
参照图2，图2是图1所示的复合吸收芯体的剖面图。由图2中可以看出，在吸水膨胀前，复合吸收芯体在导液通道6的横截面积很小，复合吸收芯体在导液通道6所在的位置处的厚度与相邻位置(参见图1至3)的厚度差很小，为毫米级别，相当于数个或数十个高分子吸水树脂颗粒膨胀前的直径之和，不会影响复合吸收芯体或包括复合吸收芯 体的吸收制品的包装和美观。当由高分子树脂构成的吸水层吸水膨胀时，导液通道位置处由于没有分布高分子吸水树脂，而旁边的高分子吸水树脂吸液膨胀，因此形成了通道横截面积显著增大从而起到显著的导流效果的导液通道(参照图4和图5)。
图6是本发明的复合吸收芯体的又一个实施例的剖面图，仅有一个由高分子吸水树脂形成的吸水层，并且没有中间吸收层。这样的复合吸收芯体在吸液后同样能够形成大横截面积的导液通道(如图7所示)。
图8本发明的复合吸收芯体的又一个实施例的剖面图，有由高分子吸水树脂形成的上吸水层和下吸水层，但是没有中间吸收层。这样的复合吸收芯体在吸液后同样能够形成大横截面积的导液通道(如图9所示)。
图10至15是分别放有平行于底层长度方向的一个长条形挡板、垂直于底层长度的一个长条形挡板、垂直于底层长度的多个(3个)长条形挡板、S行挡板、Z挡板和井字形挡板并且喷敷热熔结构胶的底层上表面的示意图。
本发明在第三方面还提供了一种制备本发明第一方面所述的复合吸收芯体的方法，所述方法包括如下步骤：
(1)在底层的上侧面底层宽度中间位置沿其长度放置挡板，然后用喷胶机喷敷热熔结构胶层；
(2)在喷敷热熔结构胶的底层上侧面上洒上用于形成下吸水层的吸液膨胀性材料，再在下吸水层上部敷设中间吸收层；
(3)在表层下侧面上用喷胶机喷敷热熔结构胶层并洒上用于形成上吸水层的吸液膨胀性材料；
(4)将步骤(3)得到的材料按上吸水层侧面向下的方式覆盖在步骤(2)得到的材料的中间吸收层上；
(5)取出挡板并压实，得到所述复合吸收芯体。
在另外的一些实施方式中，制备本发明第一方面所述的复合吸收芯体的方法也可以包括如下步骤：
(1)在表层下侧面上用喷胶机喷敷第一热熔结构胶层；
(2)在中间吸收层的上侧面上在该中间吸收层的宽度中间位置沿其长度放置第一挡板，然后洒上用于形成上吸水层的第一吸液膨胀性材料；
(3)将第一热熔结构胶层粘合在中间吸收层的洒上第一吸液膨胀性材料的上侧面上，取出第一挡板并压实；
(4)在底层上侧面上用喷胶机喷敷第二热熔结构胶层；
(5)在中间吸收层的下侧面上在该中间吸收层的宽度中间位置沿其长度放置第二挡板，然后洒上用于形成下吸水层的第二吸液膨胀性材料；
(6)将第二热熔结构胶层粘合在中间吸收层的洒上第二吸液膨胀性材料的下侧面上，取出第二挡板并压实。
所述方法并不一定按照以上顺序进行。例如：步骤(1)和步骤(2)可以同时进行，也可以依次进行或者以相反的顺序进行；步骤(4)和步骤(5)可以同时进行，也可以依次进行或者以相反的顺序进行；步骤(1)和步骤(4)可以同时进行，也可以依次进行或者以相反的顺序进行；步骤(2)和步骤(5)可以依次进行或者以相反的顺序进行；步骤(1)和步骤(5)可以同时进行，也可以依次进行或者以相反的顺序进行；步骤(2)和步骤(4)可以同时进行，也可以依次进行或者以相反的顺序进行；前提是步骤(3)必须在步骤(1)和步骤(2)之后进行，并且步骤(6)必须在步骤(4)和步骤(5)之后进行。
形成上吸水层的第一吸液膨胀性材料和/或形成下吸水层的第二吸液膨胀性材料可以由至少一个下料辊下料。另外，可以在表层下侧面喷敷第一热熔结构胶层前在导液通道预设位置对应的区域放置第三挡板和/或在底层上侧面上喷敷第二热熔结构胶层前在导液通道预设位置对应的区域放置第四挡板以形成相应的未喷敷热熔结构胶区域，并且将未喷敷热熔结构胶区域相应地与第一挡板和/或第二挡板对准再粘合。挡板的形状应该与导液通道的形状和尺寸相对应。例如，所述导液通道为1至4cm宽度的长条状导液通道为例，那么所述挡板应该为能够形成1至4cm的导液通道的长条状挡板。
下文将通过实施例的方式对本发明进行进一步的说明，但是本发 明的保护范围不限于实施例。
实施例1
表层采用宽度为9cm、克重10g/m2的无尘纸，上吸水层采用克重140g/m2、20目的高分子吸水树脂，中间吸收层采用克重35g/m2的热风蓬松无纺布，下吸水层采用克重140g/m2、40目的高分子吸水树脂，底层采用宽度为9cm、克重10g/m2的无尘纸；制备步骤为：
1)在底层的上侧面底层宽度中部沿其长度放置1cm宽的长条挡板，然后用喷胶机喷敷0.5g/m2的热熔结构胶层；
2)在喷敷热熔结构胶层的底层上侧面上洒上下吸水层，再在下吸水层上部敷设中间吸收层；
3)在表层下侧面上用喷胶机喷敷热熔结构胶层并洒上上吸水层；
4)将步骤3)的上吸水层侧面向下覆盖在步骤2)的中间吸收层上部，取出长条挡板压实后即可得到具有导流效果的复合吸收芯体。
实施例2
表层采用宽度为10cm、克重30g/m2的无尘纸，上吸水层采用克重140g/m2、25目的高分子吸水树脂，中间吸收层采用克重45g/m2的热风蓬松无纺布，下吸水层采用克重140g/m2、80目的高分子吸水树脂，底层采用宽度为10cm、克重30g/m2的无尘纸；制备步骤为：
1)在底层的上侧面底层宽度中部沿其长度放置2.5cm宽的长条挡板，然后用喷胶机喷敷1g/m2的热熔结构胶层；
2)在喷敷热熔结构胶层的底层上侧面上洒上下吸水层，再在下吸水层上部敷设中间吸收层；
3)在表层下侧面上用喷胶机喷敷热熔结构胶层并洒上上吸水层；
4)将步骤3)的上吸水层侧面向下覆盖在步骤2)的中间吸收层上部，取出长条挡板压实后即可得到具有导流效果的复合吸收芯体。
实施例3
表层采用宽度为11cm、克重50g/m2的无尘纸，上吸水层采用克重140g/m2、32目的高分子吸水树脂，中间吸收层采用克重50g/m2的热风蓬松无纺布，下吸水层采用克重140g/m2、120目的高分子吸水树脂，底层采用宽度为11cm、克重50g/m2的无尘纸；制备步骤为：
1)在底层的上侧面底层宽度中部沿其长度放置4cm宽的长条挡板，然后用喷胶机喷敷1.5g/m2的热熔结构胶层；
2)在喷敷热熔结构胶层的底层上侧面上洒上下吸水层，再在下吸水层上部敷设中间吸收层；
3)在表层下侧面上用喷胶机喷敷热熔结构胶层并洒上上吸水层；
4)将步骤3)的上吸水层侧面向下覆盖在步骤2)的中间吸收层上部，取出长条挡板压实后即可得到具有导流效果的复合吸收芯体。
实施例4
表层采用宽度为12cm、克重20g/m2的无尘纸，上吸水层采用克重140g/m2、34目的高分子吸水树脂，中间吸收层采用克重38g/m2的热风蓬松无纺布，下吸水层采用克重140g/m2、120目的高分子吸水树脂，底层采用宽度为12cm、克重20g/m2的无尘纸；制备步骤为：
1)在底层的上侧面底层宽度中部沿放置3cm宽Z形状的挡板，然后用喷胶机喷敷1.8g/m2的热熔结构胶层；
2)在喷敷热熔结构胶层的底层上侧面上洒上下吸水层，再在下吸水层上部敷设中间吸收层；
3)在表层下侧面上用喷胶机喷敷热熔结构胶层并洒上上吸水层；
4)将步骤3)的上吸水层侧面向下覆盖在步骤2)的中间吸收层上部，取出长条挡板压实后即可得到具有导流效果的复合吸收芯体。
实施例5
表层采用宽度为8cm、克重30g/m2的无尘纸，上吸水层采用克重110g/m2、33目的高分子吸水树脂，中间吸收层采用克重38g/m2的热风蓬松无纺布，下吸水层采用克重140g/m2、108目的高分子吸水树脂，底层采用宽度为12cm、克重20g/m2的无尘纸；制备步骤为：
1)在底层的上侧面底层宽度中部沿放置2cm宽S形状的挡板，然后用喷胶机喷敷1.6g/m2的热熔结构胶层；
2)在喷敷热熔结构胶层的底层上侧面上洒上下吸水层，再在下吸水层上部敷设中间吸收层；
3)在表层下侧面上用喷胶机喷敷热熔结构胶层并洒上上吸水层；
4)将步骤3)的上吸水层侧面向下覆盖在步骤2)的中间吸收层上部， 取出长条挡板压实后即可得到具有导流效果的复合吸收芯体。
上述实施例中，放置长条挡板，使底层上部中间位置留有空隙的位置没有洒下下吸水层。在吸收芯体吸收液体时，构成所述上吸收层和所述吸收层的高分子吸水树脂膨胀，从而在没有洒下下吸水层的位置处形成导液通道6，由此可以使液体渗漏时间缩短，并且较好地提高了复合吸收芯体的扩散长度。
对比例1
以实施例1基本相同的方法制备复合吸收芯体(即正常芯体)，不同的是不形成导液通道(即沟槽)。
将上述实施例1和2制得的芯体切割成38X 10cm规格，测试本发明的复合吸收芯体，并以对比例1作为对照。
测试方法为本发明的复合吸收芯体中间放上不锈钢圆环(内径50mm，外径为60mm，重量为320g，圆筒高度为5cm)，每次加入生理盐水80ml，间隔10分钟，共加液体三次；第30分钟测试返渗(加压砝码直径为10cm，重量为12kg，滤纸为中性中速滤纸)。结果参见下表1。
表1
Figure PCTCN2017100483-appb-000001
通过以上数据可以看出，带导液通道的本发明的复合吸收芯体在吸收速度和返渗方面有明显优势。
实施例6
以与实施例1基本相同的方式制备复合吸收芯体，不同的是：形 成宽度为3.5cm的导液通道；表层采用克重为40g/m2的无尘纸，上吸水层采用克重140g/m2、粒径为20目至50目的吸水树脂；下吸水层采用克重为140g/m2、粒径为20目至50目的高分子吸水树脂；底层采用克重为40g/m2的无尘纸；步骤1)中喷胶机喷敷1.5g/m2的热熔结构胶层。对比例2
以实施例6基本相同的方法制备复合吸收芯体(即正常芯体)，不同的是不形成导液通道(即沟槽)。
测量实施例6和对比例2所制得的复合吸收芯体对液体的吸收、扩散和返渗性能。测量采用4次加液法。具体操作如下。
第1次加液开始计时，时间记为0，加液量为每次60mL生理盐水，温度23℃±2℃，第4分钟测量液体扩散长度，用刻度尺进行测量。第5分钟进行第2次加液，第9分钟进行第2次扩散长度测量，第10分钟进行第一次返渗测量。第12分钟进行第3次加液，第21分钟进行第3次扩散长度测量，第22分钟进行第2次返渗测量。第24分钟进行第4次加液，33分钟进行第4次扩散长度测量，第34分钟进行第3次返渗测量。加液方法为用安装有一个内径2.4厘米竖直加液管、下部为平板、平板两边各压有砝码的加液装置进行加液，每个砝码重0.6kg，加液装置加砝码总重2kg，吸收速度，即下渗时间即液体在加液后完全下渗的时间，返渗的测试方法为用1.25kg砝码将滤纸压在吸液后的纸尿裤表面，压1分钟，称量压砝码前后滤纸的质量差即为返渗量。结果参见下表2。
表2
Figure PCTCN2017100483-appb-000002
注：各时间点以开始测试为0min分钟计时；吸收时间是完全吸收所需要的时间(s)；扩散距离是在测试时间点液体扩散的距离(cm)；返渗量为测试时间点返渗的量(g)。
实施例7和8
实施例7和8除了分别采用加压吸收量分别为10和20的SAP颗粒形成上吸水层和下吸水层之外，其他以与实施例6相同的方式进行。
实施例9和10
实施例9和10除了分别采用漩涡法吸收速度分别为85和60的SAP颗粒形成上吸水层和下吸水层之外，其他以与实施例6相同的方式进行。
实施例11和12
实施例11和12除了分别采用溶出物含量分别为15％和10％的SAP颗粒形成上吸水层和下吸水层之外，其他以与实施例6相同的方式进行。
实施例13至16
实施例15至16除了分别采用颗粒目数(D50)分别为20和120的SAP颗粒形成上吸水层和下吸水层之外，其他以与实施例6相同的方式进行。
实施例17至20
实施例17至20除了分别采用膨胀率分别为10、20、100和150的SAP颗粒形成上吸水层和下吸水层之外，其他以与实施例6相同的方式进行。
以与实施例6所述相同的方法测量实施例17至20和对比例1所制得的复合吸收芯体在第24min测得的吸收速度(即完全下渗所需时间(s))、第33min测得的扩散长度(cm)和第34min测得的返渗量(g)，并计算相对于对比例1的芯体各实施例的芯体的完全下渗所需时间减少百分比(％)、扩散长度增加百分比(％)和返渗量降低百分比(％)。加压吸收量为0.7psi压力下的加压吸收量。结果参见下表3。
表3
Figure PCTCN2017100483-appb-000003
Figure PCTCN2017100483-appb-000004
以与实施例6所述相同的方法测量各实施例和对比例2所制得的芯体在第24min测得的吸收速度(完全下渗所需时间(s))、第33min测得的扩散长度(cm)和第34min测得的返渗量(g)，并计算相对于对比例2的芯体各实施例的芯体的完全下渗所需时间减少百分比(％)、扩散长度增加百分比(％)和返渗量降低百分比(％)。另外，表中所示的加压吸收量代表0.7psi压力下的加压吸收量；膨胀率为SAP颗粒在饱和吸收生理盐水后的颗粒直径与吸收前的颗粒直径的比值。溶出物含量表示16小时溶出物含量。检测方法如前文所述。
从上表可以看出，采用本发明的优选的实施方式所制得的复合吸收芯体显著提升液体下渗速度，下渗速度可提升50％到90％；同时，液体的扩散长度可提高10％到30％左右；另外，返渗量可以降低10％到80％左右。
实施例21至23
除了下表4和表5所示内容之外，以与实施例6基本相同的方式制备复合吸收芯体，然后制作成纸尿裤，该纸尿裤包括将所述复合吸收芯体夹在其中的最内层和最外层、两端带有魔术扣贴的弹性腰围、两侧的立体防漏护围以及能够与所述魔术扣贴配合使用的前腰贴面。其中，所使用的三种类型的SAP均购自山东诺尔生物科技有限公司，它们的有关性能参见下表5。SAP的吸收速度可以以液面静止或者转子 静止时间表示，时间越短，吸收速度越快。如表5所示，511型SAP的吸收速度最慢，610S型SAP的吸收速度最快，610型SAP的吸收速度居中。另外，511型SAP的离心保水量相对较高，高于610S型和610型SAP，后两者的离心保水量相同。按照实施例6所述的方法测试这些纸尿裤对吸收性能、扩散性能和返渗性能，结果见下表6。
表4
Figure PCTCN2017100483-appb-000005
表5
SAP型号 吸收速度-液面静止(s) 吸收速度-转子静止(s) 离心保水量
NR511 32 62 34
NR610 24 46 30
NR610S 20 34 30
表6
时间点和测试项目 实施例21 实施例22 实施例23
芯体质量(g) 23.63 23.21 23.17
0min吸收/s 7 7 8
5min吸收/s 30 12 11
12min吸收/s 38 12 10
24min吸收/s 33 12 9
4min扩散/cm 20.0 21.0 21.1
9min扩散/cm 20.0 23.5 24.0
21min扩散/cm 23.5 24.8 27.0
33min扩散/cm 26.5 29.0 31.0
10min返渗/g 0.10 0.09 0.15
22min返渗/g 1.63 0.87 2.66
34min返渗/g 5.68 2.83 7.84
比较实施例21和22可以看出，同样是上吸水层使用511型SAP，下吸水层使用610S型SAP这个组合的实施例21和22，具有导液通道的实施例22所制得的复合吸收芯体的液体下渗速度更快(吸收时间(秒(s))，指的是液体下渗时间，时间越短，下渗速度越快)，扩散长度更长，同时返渗量更低。
比较实施例22和23可以看出，在设置有导液通道的情况中，当上吸水层的SAP的吸收速度慢于下吸水层的SAP，并且上吸水层的SAP的离心保水量高于下吸水层的SAP的离心保水量时，使用这样的复合吸收芯体制成的纸尿裤成品反渗量低，干爽性好(如实施例22的数据显示)；如果上吸水层和下吸水层都采用吸收速度一样快并且离心保水量一样多的610型SAP时，虽然上吸水层的SAP的吸收速度快于实施例22所使用的SAP，返渗量反而会相对较高。
采用本发明方法制备的复合吸收芯体具有如下优点：干爽性好，不起坨，不断层，因为具有导流作用，所以液体下渗速度快，扩散性能也优于一般复合吸收芯体。可以应用于各种吸收制品，例如卫生用品如卫生巾偶纸尿裤，特别是超薄的婴儿纸尿裤、婴儿纸尿片等。

Claims (17)

  1. 一种复合吸收芯体，所述复合吸收芯体自上而下依次包括表层、中间层和底层，其特征在于，所述中间层包括由吸收液体后膨胀的吸液膨胀性材料制成的吸水层，并且在吸水层中设置有吸液自扩张式导液通道。
  2. 根据权利要求1所述的复合吸收芯体，其特征在于，所述吸液自扩张式导液通道利用所述吸液膨胀性材料在吸液后膨胀来实现导液通道的自扩张。
  3. 根据权利要求1或2所述的复合吸收芯体，其特征在于，所述吸液膨胀性材料为高分子吸水树脂，优选为高分子吸水树脂颗粒。
  4. 根据权利要求1至3中任一项所述的复合吸收芯体，其特征在于：
    所述中间层包括位于所述表层下表面的上吸水层和位于所述底层上表面的下吸水层，更优选进一步包括位于所述上吸水层和所述下吸水层之间的中间吸收层；和/或
    所述导液通道设置在所述上吸水层和/或下吸水层中位于整幅复合吸收芯体宽度的中部位置；另外优选的是，所述导液通道设置在所述下吸水层中位于整幅复合吸收芯体宽度的中部位置。
  5. 根据权利要求4所述的复合吸收芯体，其特征在于，所述中间层还包括位于所述上吸水层和所述下吸水层之间的中间吸收层。
  6. 根据权利要求1至5中任一项所述的复合吸收芯体，其特征在于：
    所述复合吸收芯体整幅宽度为8至15cm；和/或
    所述导液通道的宽度为0.5至4cm。
  7. 根据权利要求4至6中任一项所述的复合吸收芯体，其特征在于，所述上吸水层通过热熔结构胶层固定在所述表层的下侧面；和/或所述下吸水层通过热熔结构胶层固定在所述底层的上侧面。
  8. 根据权利要求1至7中任一项所述的复合吸收芯体，其特征在于：
    所述表层和/或底层为平方克重10-90g的纺粘无纺布或无尘纸或者 由聚乙烯纤维、聚丙烯纤维、聚氯乙烯纤维、聚酯纤维、天然或人造棉或纤维素纤维中的一种或几种经过热风、热轧、水刺、针刺、纺粘或空气铺网成型形成的无纺布或者纺织布；和/或所述中间吸收层为平方克重在15-80g的蓬松无纺布。
  9. 根据权利要求4至8中任一项所述的复合吸收芯体，其特征在于，所述上吸水层为20-120目的高分子吸水树脂，和/或所述下吸水层为20-120目的高分子吸水树脂；或者所述上吸水层的高分子吸水树脂颗粒的D50为25-50目，和/或所述下吸水层的高分子吸水树脂颗粒的D80为30-100目。
  10. 根据权利要求1至9中任一项所述的复合吸收芯体，其特征在于，所述导液通道通过吸水层中对应于所述导液通道的区域不分布吸液膨胀性材料来形成。
  11. 根据权利要求1至10中任一项所述的复合吸收芯体，其特征在于，所述导液通道为长条状、Z形状、S形状或井字形结构；优选的是，所述导液通道的数量为1至4。
  12. 根据权利要求1至11中任一项所述的复合吸收芯体，其特征在于：
    所述吸液膨胀性材料的线膨胀系数为20至100；
    所述吸液膨胀性材料在0.7psi压力下的加压吸收量为不低于10g/g；
    所述吸液膨胀性材料的漩涡法吸收速度为小于85秒；和/或
    所述吸液膨胀性材料的16小时溶出物含量小于15％。
  13. 根据权利要求1至12所述的复合吸收芯体，其特征在于：
    所述上吸水层所使用的高分子吸水树脂的离心保水量高于所述下吸水层的离心保水量，并且所述上吸水层所使用的高分子吸水树脂的液体吸收速度慢于所述下吸水层的液体吸收速度。
  14. 一种制备权利要求4至13中任一项所述的复合吸收芯体的方法，其特征在于，所述方法包括如下步骤：
    (1)在底层的上侧面底层宽度中间位置沿其长度放置挡板，然后用喷胶机喷敷热熔结构胶层；
    (2)在喷敷热熔结构胶的底层上侧面上洒上用于形成下吸水层的吸液膨胀性材料，再在下吸水层上部敷设中间吸收层；
    (3)在表层下侧面上用喷胶机喷敷热熔结构胶层并洒上用于形成上吸水层的吸液膨胀性材料；
    (4)将步骤(3)得到的材料按上吸水层侧面向下的方式覆盖在步骤(2)得到的材料的中间吸收层上；
    (5)取出挡板并压实，得到所述复合吸收芯体。
  15. 根据权利要求1至13任一项所述的复合吸收芯体在制造吸收制品中的应用。
  16. 一种吸收制品，其特征在于，所述吸收制品包括根据权利要求1至13中任一项所述的复合吸收芯体。
  17. 根据权利要求16所述的吸收制品，其特征在于，所述吸收制品为一次性卫生用品，优选为卫生巾或纸尿裤。
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