CN115381627B - Composite multi-layer high-hydroscopicity sanitary dressing and preparation method thereof - Google Patents
Composite multi-layer high-hydroscopicity sanitary dressing and preparation method thereof Download PDFInfo
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- CN115381627B CN115381627B CN202210979766.3A CN202210979766A CN115381627B CN 115381627 B CN115381627 B CN 115381627B CN 202210979766 A CN202210979766 A CN 202210979766A CN 115381627 B CN115381627 B CN 115381627B
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- 239000002131 composite material Substances 0.000 title claims abstract description 59
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- 239000000835 fiber Substances 0.000 claims abstract description 154
- 238000010521 absorption reaction Methods 0.000 claims abstract description 78
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 74
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 44
- 239000000463 material Substances 0.000 claims abstract description 15
- 238000009998 heat setting Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 32
- 239000004743 Polypropylene Substances 0.000 claims description 25
- 239000002245 particle Substances 0.000 claims description 25
- -1 polypropylene Polymers 0.000 claims description 25
- 229920001155 polypropylene Polymers 0.000 claims description 25
- 238000005098 hot rolling Methods 0.000 claims description 21
- 239000007921 spray Substances 0.000 claims description 18
- 238000005507 spraying Methods 0.000 claims description 11
- 238000007664 blowing Methods 0.000 claims description 10
- 238000007493 shaping process Methods 0.000 claims description 10
- 238000009987 spinning Methods 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 9
- 239000000155 melt Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000000853 adhesive Substances 0.000 abstract description 2
- 230000001070 adhesive effect Effects 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 206010052428 Wound Diseases 0.000 description 6
- 208000027418 Wounds and injury Diseases 0.000 description 6
- 239000012467 final product Substances 0.000 description 3
- 230000035876 healing Effects 0.000 description 3
- 239000002250 absorbent Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 210000004243 sweat Anatomy 0.000 description 1
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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
- A61F13/01—Non-adhesive bandages or dressings
- A61F13/01021—Non-adhesive bandages or dressings characterised by the structure of the dressing
- A61F13/01029—Non-adhesive bandages or dressings characterised by the structure of the dressing made of multiple layers
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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
- A61F13/01—Non-adhesive bandages or dressings
- A61F13/01008—Non-adhesive bandages or dressings characterised by the material
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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
- A61F13/01—Non-adhesive bandages or dressings
- A61F13/01034—Non-adhesive bandages or dressings characterised by a property
- A61F13/01042—Absorbency
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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
- A61F13/02—Adhesive bandages or dressings
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/098—Melt spinning methods with simultaneous stretching
- D01D5/0985—Melt spinning methods with simultaneous stretching by means of a flowing gas (e.g. melt-blowing)
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- 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
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- D—TEXTILES; PAPER
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- 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
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- D04H1/4291—Olefin series
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- 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
- D04H1/4374—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 using different kinds of webs, e.g. by layering webs
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- D—TEXTILES; PAPER
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- 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
- D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
- D04H1/43835—Mixed fibres, e.g. at least two chemically different fibres or fibre blends
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- 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
- D04H1/54—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 by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/56—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 by welding together the fibres, e.g. by partially melting or dissolving in association with fibre formation, e.g. immediately following extrusion of staple fibres
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
Landscapes
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Textile Engineering (AREA)
- Animal Behavior & Ethology (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- General Health & Medical Sciences (AREA)
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- Nonwoven Fabrics (AREA)
- Absorbent Articles And Supports Therefor (AREA)
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Abstract
The invention discloses a composite multi-layer high water absorption sanitary dressing and a preparation method thereof, wherein the composite multi-layer high water absorption sanitary dressing is prepared by heat setting four layers of fiber webs, and the first layer of fiber web and the fourth layer of fiber web are melt-blown fiber webs and account for 5-15 wt% of the composite multi-layer high water absorption sanitary dressing; the second layer of fiber net and the third layer of fiber net are combined into a water absorption layer, the water absorption layer is formed by mixing wood pulp fiber and melt-blown fiber, the wood pulp fiber in the water absorption layer accounts for 60-80 wt% of the composite multilayer high water absorption sanitary dressing, and the melt-blown fiber in the water absorption layer accounts for 15-25 wt% of the composite multilayer high water absorption sanitary dressing. The manufacturing method of the composite multi-layer high water absorption sanitary dressing does not use any adhesive substance, is environment-friendly in material, is manufactured through a one-step processing technology, has a unique multi-layer structure, and effectively utilizes the moisture absorption performance of wood pulp fibers.
Description
Technical Field
The invention particularly relates to the technical field of medical sanitary dressing, in particular to a composite multi-layer high-hydroscopicity sanitary dressing and a preparation method thereof.
Background
The medical auxiliary materials are used as medical supplies for wrapping wounds, are directly related to the comfort of users and the healing process of the wounds, and are continuously updated and improved along with the deep study of pathophysiology in the healing process of the wounds; the medical sanitary dressing prepared in the current market has the defect of poor hygroscopicity, and along with the discharge of human sweat in the use process, the humidity of the microenvironment between the dressing and the wound is increased, so that the wound is in a moist environment, bacteria are easily bred, and the healing process of the wound is influenced.
If wood pulp fibers are introduced into the water-absorbent layer, the wood pulp fibers are easy to fall off in the composite material due to the short length, so that the phenomenon of chip falling occurs, and therefore, the excellent water-absorbent performance of the wood pulp fibers is required to be used, and the problem of chip falling is preferentially required to be solved.
Disclosure of Invention
Therefore, the invention provides a composite multi-layer high water absorption sanitary dressing and a preparation method thereof to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: a composite multi-layer high water absorption sanitary dressing is prepared from four layers of fiber webs through heat setting, wherein the first layer of fiber web and the fourth layer of fiber web are melt-blown fiber webs and account for 5-15 wt% of the composite multi-layer high water absorption sanitary dressing;
the second layer of fiber net and the third layer of fiber net are combined into a water absorption layer, the water absorption layer is formed by mixing wood pulp fiber and melt-blown fiber, the wood pulp fiber in the water absorption layer accounts for 60-80 wt% of the composite multilayer high water absorption sanitary dressing, and the melt-blown fiber in the water absorption layer accounts for 15-25 wt% of the composite multilayer high water absorption sanitary dressing.
Further, preferably, the fineness of the meltblown fibers of the first and fourth webs is 0.5 to 10 μm, and the fineness of the meltblown fibers of the second and third webs is 5 to 20 μm.
A method for preparing a composite multi-layer high water absorption sanitary dressing, which comprises the following steps:
step one: the wood pulp rolls are subjected to a wood pulp opening system to form fluff pulp fibers with the length of 1-4 mm, and the fluff pulp fibers are used as second and third layers of standby materials, and then the fluff pulp fibers are fed into a forming box through a double feeding system;
step two: heating and melting polypropylene particles by adopting a melt-blowing process, feeding the polypropylene particles into a spinning box body through a screw extruder and a transmission pipeline, spraying the polypropylene particles through a spinneret plate, and finally stretching and shaping the polypropylene particles through process air to form a first layer and a fourth layer of melt-blown fiber net;
step three: uniformly mixing fluff pulp fibers in the first step with fibers sprayed out of an inner side melt-blown spinneret plate in a forming box to form a second layer of a composite material and a third water-absorbing layer;
step four: the four-layer composite fiber net consisting of the melt-blown fiber net, the water-absorbing layer and the melt-blown fiber net is manufactured through the steps one to three, and hot rolling shaping is carried out through a hot rolling mill, so that the composite multi-layer high water absorption sanitary dressing is formed.
Further preferably, in the second step, the polypropylene particles have a melt index of 200 to 800g/10min.
Further preferably, in the second step, the temperature of the screw extruder and the conveying pipeline is 220 ℃ to 260 ℃, and the temperature of the spinning manifold and the spinneret plate is 230 ℃ to 270 ℃.
Further preferably, in the second step, the spinneret plate has a multi-row hole structure, and the spray diameter of the spray head on the spinneret plate is 0.5 to 10 μm.
Further preferably, in the second step, the process air volume is 800m 3 /h～1500m 3 /h。
Further preferably, in the third step, the inner melt-blowing spinneret has a multi-row hole structure, and the spray diameter of the spray head on the inner melt-blowing spinneret is 5 to 20 μm.
Further preferably, in the fourth step, the hot rolling temperature of the hot rolling mill is 90 ℃ to 120 ℃.
Compared with the prior art, the invention has the following beneficial effects:
1. the composite multi-layer high water absorption sanitary dressing prepared by the invention effectively avoids the phenomenon of chip falling of the wood pulp water absorption layer after consolidation of the melt-blown fiber web.
2. The composite multi-layer high water absorption sanitary dressing can effectively avoid the phenomenon that the wood pulp water absorption layer shifts and aggregates when the material product is used, and simultaneously, the sanitary dressing is endowed with good softness by utilizing the difference of the fineness of the melt-blown fibers of the inner layer and the outer layer.
3. The manufacturing method of the composite multi-layer high water absorption sanitary dressing does not use any adhesive substance, is environment-friendly in material, is manufactured through a one-step processing technology, has a unique multi-layer structure, and effectively utilizes the moisture absorption performance of wood pulp fibers.
Drawings
FIG. 1 is a schematic view of a production line of a composite multi-layer superabsorbent sanitary dressing;
fig. 2 is a structural cross-sectional view of a composite multi-layer superabsorbent sanitary dressing.
In the figure: 1. opening the system; 2. multiple rows of Kong Rong spray heads; 3. wood pulp spray head; 4. a forming box; 5. a web forming system; 6. a hot rolling mill; 7. a meltblown web; 8. a water-absorbing layer.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1: referring to fig. 1 and 2, the present invention provides a technical solution: a composite multi-layer high water absorption sanitary dressing is prepared from four layers of fiber webs through heat setting, wherein the first layer of fiber web and the fourth layer of fiber web are melt-blown fiber web 7 and account for 15wt% of the composite multi-layer high water absorption sanitary dressing;
the second layer of fiber net and the third layer of fiber net are combined into a water absorption layer 8, the water absorption layer 8 is formed by mixing wood pulp fiber and melt-blown fiber, the wood pulp fiber in the water absorption layer 8 accounts for 60wt% of the composite multi-layer high water absorption sanitary dressing, and the melt-blown fiber in the water absorption layer 8 accounts for 25wt% of the composite multi-layer high water absorption sanitary dressing.
In this example, the first and fourth webs had a meltblown fiber fineness of 0.5 to 10 μm and the second and third webs had a meltblown fiber fineness of 5 to 20 μm.
A method for preparing a composite multi-layer high water absorption sanitary dressing, which comprises the following steps:
step one: the wood pulp rolls are subjected to a wood pulp opening system 1 to form fluff pulp fibers with the length of 1-4 mm, and are used as a second layer of standby materials and a third layer of standby materials, and then the fluff pulp fibers are fed into a forming box 4 through a double feeding system;
step two: heating and melting polypropylene particles by adopting a melt-blowing process, feeding the polypropylene particles into a spinning box body through a screw extruder and a transmission pipeline, spraying the polypropylene particles through a spinneret plate, and finally stretching and shaping the polypropylene particles through process air to form a first layer and a fourth layer of melt-blown fiber net 7;
specifically, the melt index of polypropylene particles is 300g/10min, the temperature process of a screw extruder and a transmission pipeline is 240-250 ℃, the temperature process of a spinning box and a spinneret plate is 250-270 ℃, the spinneret plate is of a multi-row hole structure, the spray head sprays fiber bundles with the diameter of 0.5-10 mu m, and the process air of the melt blowing process is 1200m 3 /h～1500m 3 Between/h;
step three: uniformly mixing fluff pulp fibers in the first step with fibers sprayed by an inner side melt-spraying spinneret plate in a forming box 4 to form a second layer of composite material and a third water-absorbing layer 8;
specifically, the wood pulp fiber nozzle is biased to the inner side melt-blown spinneret plate, the inner side melt-blown spinneret plate is provided with a multi-row hole structure, the nozzle sprays fiber bundles with the diameter of 5-20 mu m, and the multi-row hole spinneret plate is utilized to generate thicker melt-blown fibers, so that the melt-blown fibers are fully mixed with the wood pulp fibers with the length of 1-4 mm in the forming box 4 under the action of compressed air flow, better bonding and fixing of the wood pulp fibers are realized, and the chip dropping problem of the wood pulp fibers is more favorably solved;
step four: the four-layer composite fiber net consisting of the melt-blown fiber net 7, the water absorption layer 8 and the melt-blown fiber net 7 is manufactured from the first step to the third step, and is subjected to hot rolling shaping by a hot rolling mill 6, and a composite multi-layer high water absorption sanitary dressing is formed;
specifically, the hot rolling temperature of the hot rolling mill 6 is set to 90-120 ℃, and the melt-blown fiber of the outer layer of the conforming material is finer than that of the inner layer, so that the texture of the final product is soft.
Example 2: referring to fig. 1-2, the present invention provides a technical solution: a composite multi-layer high water absorption sanitary dressing is prepared from four layers of fiber webs through heat setting, wherein the first layer of fiber web and the fourth layer of fiber web are melt-blown fiber web 7 and account for 10wt% of the composite multi-layer high water absorption sanitary dressing;
the second layer of fiber net and the third layer of fiber net are combined into a water absorption layer 8, the water absorption layer 8 is formed by mixing wood pulp fiber and melt-blown fiber, the wood pulp fiber in the water absorption layer 8 accounts for 70wt% of the composite multi-layer high water absorption sanitary dressing, and the melt-blown fiber in the water absorption layer 8 accounts for 20wt% of the composite multi-layer high water absorption sanitary dressing.
In this example, the first and fourth webs had a meltblown fiber fineness of 0.5 to 10 μm and the second and third webs had a meltblown fiber fineness of 5 to 20 μm.
A method for preparing a composite multi-layer high water absorption sanitary dressing, which comprises the following steps:
step one: the wood pulp rolls are subjected to a wood pulp opening system 1 to form fluff pulp fibers with the length of 1-4 mm, and are used as a second layer of standby materials and a third layer of standby materials, and then the fluff pulp fibers are fed into a forming box 4 through a double feeding system;
step two: heating and melting polypropylene particles by adopting a melt-blowing process, feeding the polypropylene particles into a spinning box body through a screw extruder and a transmission pipeline, spraying the polypropylene particles through a spinneret plate, and finally stretching and shaping the polypropylene particles through process air to form a first layer and a fourth layer of melt-blown fiber net 7;
specifically, the melt index of polypropylene particles is 500g/10min, the temperature process of a screw extruder and a transmission pipeline is 230-240 ℃, the temperature process of a spinning box and a spinneret plate is 230-250 ℃, the spinneret plate is of a multi-row hole structure, the spray diameter of the spray head is 0.5-10 mu m, and the process air of the melt-blowing process is 800m 3 /h～1200m 3 Between/h;
step three: uniformly mixing fluff pulp fibers in the first step with fibers sprayed by an inner side melt-spraying spinneret plate in a forming box 4 to form a second layer of composite material and a third water-absorbing layer 8;
specifically, the wood pulp fiber nozzle is biased to the inner side melt-blown spinneret plate, the inner side melt-blown spinneret plate is provided with a multi-row hole structure, the nozzle sprays fiber bundles with the diameter of 5-20 mu m, and the multi-row hole spinneret plate is utilized to generate thicker melt-blown fibers, so that the melt-blown fibers are fully mixed with the wood pulp fibers with the length of 1-4 mm in the forming box 4 under the action of compressed air flow, better bonding and fixing of the wood pulp fibers are realized, and the chip dropping problem of the wood pulp fibers is more favorably solved;
step four: the four-layer composite fiber net consisting of the melt-blown fiber net 7, the water absorption layer 8 and the melt-blown fiber net 7 is manufactured from the first step to the third step, and is subjected to hot rolling shaping by a hot rolling mill 6, and a composite multi-layer high water absorption sanitary dressing is formed;
specifically, the hot rolling temperature of the hot rolling mill 6 is set to 90-120 ℃, and the melt-blown fiber of the outer layer of the conforming material is finer than that of the inner layer, so that the texture of the final product is soft.
Example 3: referring to fig. 1-2, the present invention provides a technical solution: a composite multi-layer high water absorption sanitary dressing is prepared from four layers of fiber webs through heat setting, wherein the first layer of fiber web and the fourth layer of fiber web are melt-blown fiber web 7 and account for 8wt% of the composite multi-layer high water absorption sanitary dressing;
the second layer of fiber net and the third layer of fiber net are combined into a water absorption layer 8, the water absorption layer 8 is formed by mixing wood pulp fiber and melt-blown fiber, the wood pulp fiber in the water absorption layer 8 accounts for 70wt% of the composite multi-layer high water absorption sanitary dressing, and the melt-blown fiber in the water absorption layer 8 accounts for 22wt% of the composite multi-layer high water absorption sanitary dressing.
In this example, the first and fourth webs had a meltblown fiber fineness of 0.5 to 10 μm and the second and third webs had a meltblown fiber fineness of 5 to 20 μm.
A method for preparing a composite multi-layer high water absorption sanitary dressing, which comprises the following steps:
step one: the wood pulp rolls are subjected to a wood pulp opening system 1 to form fluff pulp fibers with the length of 1-4 mm, and are used as a second layer of standby materials and a third layer of standby materials, and then the fluff pulp fibers are fed into a forming box 4 through a double feeding system;
step two: heating and melting polypropylene particles by adopting a melt-blowing process, feeding the polypropylene particles into a spinning box body through a screw extruder and a transmission pipeline, spraying the polypropylene particles through a spinneret plate, and finally stretching and shaping the polypropylene particles through process air to form a first layer and a fourth layer of melt-blown fiber net 7;
specifically, the melt index of polypropylene particles is 800g/10min, the temperature process of a screw extruder and a transmission pipeline is 220-230 ℃, the temperature process of a spinning box and a spinneret plate is 230-250 ℃, the spinneret plate is of a multi-row hole structure, the spray diameter of the spray head is 0.5-10 mu m, and the process air of the melt-blowing process is 800m 3 /h～1000m 3 Between/h;
step three: uniformly mixing fluff pulp fibers in the first step with fibers sprayed by an inner side melt-spraying spinneret plate in a forming box 4 to form a second layer of composite material and a third water-absorbing layer 8;
specifically, the wood pulp fiber nozzle is biased to the inner side melt-blown spinneret plate, the inner side melt-blown spinneret plate is provided with a multi-row hole structure, the nozzle sprays fiber bundles with the diameter of 5-20 mu m, and the multi-row hole spinneret plate is utilized to generate thicker melt-blown fibers, so that the melt-blown fibers are fully mixed with the wood pulp fibers with the length of 1-4 mm in the forming box 4 under the action of compressed air flow, better bonding and fixing of the wood pulp fibers are realized, and the chip dropping problem of the wood pulp fibers is more favorably solved;
step four: the four-layer composite fiber net consisting of the melt-blown fiber net 7, the water absorption layer 8 and the melt-blown fiber net 7 is manufactured from the first step to the third step, and is subjected to hot rolling shaping by a hot rolling mill 6, and a composite multi-layer high water absorption sanitary dressing is formed;
specifically, the hot rolling temperature of the hot rolling mill 6 is set to 90-120 ℃, and the melt-blown fiber of the outer layer of the conforming material is finer than that of the inner layer, so that the texture of the final product is soft.
In summary, the composite multi-layer high water absorption sanitary dressing prepared in examples 1 to 3 was subjected to performance detection according to GB/T24218.6-2010 and GB/T24218.10-2016, and the detection results are as follows:
the water absorption capacity of example 1 was 910% and the floc falling performance was 4.3;
the water absorption capacity of example 2 was 1032% and the floc falling performance was 4.6;
the water absorption capacity of example 3 was 1050% and the floc falling property was 4.5.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. The preparation method of the composite multi-layer high water absorption sanitary dressing is characterized by comprising the following steps of:
step one: the wood pulp rolls are subjected to a wood pulp opening system (1) to form fluff pulp fibers with the length of 1-4 mm, and are used as second and third layers of standby materials, and then the fluff pulp fibers are fed into a forming box (4) through a double feeding system;
step two: heating and melting polypropylene particles by adopting a melt-blowing process, feeding the polypropylene particles into a spinning box body through a screw extruder and a transmission pipeline, spraying the polypropylene particles through a spinneret plate, and finally stretching and shaping the polypropylene particles through process air to form a first layer and a fourth layer of melt-blown fiber net (7);
step three: uniformly mixing fluff pulp fibers in the first step and fibers sprayed by an inner side melt-spraying spinneret plate in a forming box (4) to form a second layer of a composite material and a third water-absorbing layer (8);
step four: the four-layer composite fiber net consisting of the melt-blown fiber net (7), the water absorption layer (8) and the melt-blown fiber net (7) is manufactured through the steps one to three, hot rolling and shaping are carried out through a hot rolling mill (6), and a composite multi-layer high water absorption sanitary dressing is formed;
in the second step, the melt index of the polypropylene particles is 200-800 g/10min, the temperature of the screw extruder and the transmission pipeline is 220-260 ℃, the temperature of the spinning box body and the spinneret plate is 230-270 ℃, the spinneret plate is of a multi-row hole structure, the spraying diameter of a spray nozzle on the spinneret plate is 0.5-10 mu m, and the air quantity of process air is 800m 3 /h～1500m 3 /h；
In the third step, the inner side melt-blown spinneret plate is of a multi-row hole structure, and the spraying diameter of a spray head on the inner side melt-blown spinneret plate is 5-20 mu m;
in the fourth step, the hot rolling temperature of the hot rolling mill (6) is 90-120 ℃.
2. The method for preparing the composite multi-layer high water absorption sanitary dressing according to claim 1, which is characterized in that: the composite multi-layer high water absorption sanitary dressing is prepared from four layers of fiber webs through heat setting, wherein the first layer of fiber web and the fourth layer of fiber web are melt-blown fiber webs (7) and account for 5-15 wt% of the composite multi-layer high water absorption sanitary dressing;
the second layer of fiber net and the third layer of fiber net are combined into a water absorption layer (8), the water absorption layer (8) is formed by mixing wood pulp fiber and melt-blown fiber, the wood pulp fiber in the water absorption layer (8) accounts for 60-80 wt% of the composite multi-layer high-water-absorption sanitary dressing, and the melt-blown fiber in the water absorption layer (8) accounts for 15-25 wt% of the composite multi-layer high-water-absorption sanitary dressing;
when forming the second fiber web and the third fiber web, the wood pulp fiber nozzle is biased to the inner side melt-blown spinneret plate, the inner side melt-blown spinneret plate is provided with a multi-row hole structure, the nozzle sprays out fiber bundles, and the multi-row hole spinneret plate is utilized to generate thicker melt-blown fibers, so that the melt-blown fibers and the wood pulp fibers are fully mixed in the forming box under the action of compressed air flow.
3. The method for preparing the composite multi-layer high water absorption sanitary dressing according to claim 2, wherein the method comprises the following steps: the fineness of the melt-blown fibers of the first layer of fiber web and the fourth layer of fiber web is 0.5-10 mu m, and the fineness of the melt-blown fibers of the second layer of fiber web and the third layer of fiber web is 5-20 mu m.
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