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Cutting process of PVA (polyvinyl alcohol) composite

A technology of polyvinyl alcohol and composite materials, which is applied in the field of medical supplies, can solve the problems of falling off, being easily torn apart, and the decline of mechanical properties, so as to achieve low production costs, reduce the falling of broken fibers, and reduce the generation of debris Effect

Active Publication Date: 2019-08-20
HUNAN XINJINFU MEDICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Long fibers have good adhesion and generally do not fall off; but short fibers fall off in large quantities due to the decrease in adhesion or the phenomenon of suspension
[0005] In addition, for polyvinyl alcohol film, the traditional circular knife cutting often causes kerf phenomenon. Due to the high crystallinity of polyvinyl alcohol, the molecular arrangement is more orderly.
The existence of the kerf will cause it to be easily torn along the kerf, resulting in a decrease in mechanical properties

Method used

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  • Cutting process of PVA (polyvinyl alcohol) composite
  • Cutting process of PVA (polyvinyl alcohol) composite
  • Cutting process of PVA (polyvinyl alcohol) composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A kind of cutting process of polyvinyl alcohol composite material, spread the 75wt% polyvinyl alcohol and 25wt% cotton yarn blended woven fabric on the cutting table, and then use the heating knife at 230 ℃ along the predetermined cutting line to weave the polyvinyl alcohol composite fabric Cutting is carried out to separate the corresponding part of the polyvinyl alcohol composite woven fabric.

[0034] Here, the alcohol alkalinity of polyvinyl alcohol is 90%, the degree of polymerization is 1700, and the cutting position is always under the protection of argon during the cutting process.

Embodiment 2

[0036] A cutting process of polyvinyl alcohol composite materials, laying the non-woven fabric co-made of 75wt% polyvinyl alcohol and 25wt% PP on the cutting table, and then using a heating knife at 330°C along the predetermined cutting line on the polyvinyl alcohol composite non-woven fabric Cutting is performed to separate the corresponding portion of the polyvinyl alcohol composite non-woven fabric.

[0037] Here, the alcohol alkalinity of polyvinyl alcohol is 95%, the degree of polymerization is 2400, and the cut is always under the protection of neon gas during the cutting process.

Embodiment 3

[0039] A cutting process of polyvinyl alcohol composite materials, laying 85wt% polyvinyl alcohol, 7wt% PP and 8wt% cotton yarn film on the cutting table, and then using a 420°C heating knife along the predetermined cutting line to compound polyvinyl alcohol Cutting is performed on the film to separate the corresponding portion of the polyvinyl alcohol composite film.

[0040] Here, the alcohol alkalinity of polyvinyl alcohol is 100%, the degree of polymerization is 2600, and the cut is always under the protection of helium during the cutting process.

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Abstract

The invention discloses a cutting process of a PVA (polyvinyl alcohol) composite and relates to the field of PVA processing. According to a main technical scheme, PVA woven fabric, PVA non-woven fabric or a PVA film is cut along a set trim with a heating cutting or through ultrasonic wave or laser to separate the corresponding PVA woven fabric, the PVA non-woven fabric or the PVA film. By means ofthe technical scheme, on one hand, the melting point of PVA is close to the decomposition temperature of PVA, and therefore, PVA can be molten and decomposed in the cutting process through the heating cutter, ultrasonic wave or laser, so that a formed cutting edge cannot have chips and no broken fiber falls off; besides, due to the poor PVA melting processing performance and low flowability in amolten state, and the heat conductivity of the cutting behavior is very small, which is shown by the fact that the edge of a material formed by cutting cannot get hard.

Description

technical field [0001] The invention relates to the field of medical supplies, in particular to a cutting process of polyvinyl alcohol composite material. Background technique [0002] Medical dressing is a kind of dressing used for medical dressing, covering, etc. It is widely used in hospital operations or people's daily dressing of wounds. However, existing medical dressings are generally made of cotton yarn, polypropylene non-woven fabric, flax and other materials, so there are reasons such as poor hydrophilicity and poor biocompatibility, which affect the healing quality of the wound surface. [0003] Polyvinyl alcohol (PVA) is the only hydrophilic and non-toxic polymer that has been found so far. PVA medical dressings are rapidly occupying the dressing market due to their excellent ability to absorb exudate, non-toxicity and biodegradability. . Among them, polyvinyl alcohol dressings are mainly divided into: ① polyvinyl alcohol medical gauze and polyvinyl alcohol non...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06H7/22B26D7/08B26D7/10B23K26/38B23K26/402
CPCD06H7/221D06H7/223B26D7/086B26D7/10B23K26/38B23K26/402
Inventor 陈绍永
Owner HUNAN XINJINFU MEDICAL TECH CO LTD
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