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Green ventilated felt for forming composite material and preparation method of green ventilated felt

A composite material and breathable felt technology, applied in textiles, papermaking, non-woven fabrics and other directions, can solve the problems of unfavorable low-cost composite material development, difficulty in recycling and reusing breathable felt, and difficulty in recycling waste airfelt, etc. Application, easy recycling, good effect of molding process

Inactive Publication Date: 2017-02-15
ACC BEIJING SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the main raw materials for preparing air felt are polyester staple fiber, nylon staple fiber, aramid staple fiber and other chemical fibers, but there are problems such as poor air permeability under high temperature and high pressure environment, difficulty in recycling air felt after use, and environmental pollution.
For example, patent CN103741373A discloses a high-temperature, high-pressure, high-permeability air felt for autoclave molding composite materials and its preparation method. The main raw materials used in the air felt are polyester staple fibers, modified polyester staple fibers and anti-shedding short Fiber, high cost, not conducive to the development of low-cost composite materials advocated in the industry, and at the same time, there is a problem of difficulty in recycling waste air felt after use

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A green air felt for composite material molding and a preparation method thereof, the preparation steps of which are:

[0027] (1) Get 50g of jute fibers and 70g of polyester fibers to open once respectively, and then mix and open.

[0028] (2) The fiber after mixing and loosening is fed into the carding machine and carried out the first time carding, and the quantification is 667g / m 2 The fiber web is then carded for the second time. The feeding frequency of the carding machine is 2.9 Hz, the cylinder frequency is 20.15 Hz, and the doffer frequency is 13.01 Hz.

[0029] (3) The single-layer fiber web output by the second pass of carding is cross-folded into a thick web by a web-laying machine, and the frequency of the small curtain is 3.87 Hz.

[0030] (4) Send the cross-laid fiber thick net into the drafting machine and the pre-acupuncture machine in turn, and consolidate into a fiber mat through acupuncture. The needle density was 1750 needles / m; the acupuncture fr...

Embodiment 2

[0034] A green air felt for composite material molding and a preparation method thereof, the preparation steps of which are:

[0035] (1) Get 228g jute fiber and 60g polyester fiber to carry out opening once respectively, then mix and open.

[0036] (2) The fiber after mixing and loosening is fed into the carding machine and carried out the first pass of carding, and the quantitative obtained is 1833g / m 2 fiber web, followed by a second pass of carding. The feeding frequency of the carding machine is 2.9Hz, the cylinder frequency is 20.15Hz, and the doffer frequency is 13.01Hz.

[0037] (3) The single-layer fiber web output by the second pass of carding is cross-folded into a thick web by a web lapper, and the frequency of the small curtain is 4.5 Hz.

[0038] (4) Send the cross-laid fiber thick net into the drafting machine and the pre-acupuncture machine in turn, and consolidate into a fiber mat through acupuncture. The needle density was 1750 needles / m; the acupuncture f...

Embodiment 3

[0042] A green air felt for composite material molding and a preparation method thereof, the preparation steps of which are:

[0043] (1) Get 78 jute fibers and 52 g ramie noil fibers to open once respectively, and then mix and open.

[0044] (2) The fiber after mixing and loosening is fed into the carding machine and carried out the first time carding, and the quantification is 690g / m 2 The fiber web is then carded for the second time. The feeding frequency of the carding machine is 3.0 Hz, the cylinder frequency is 20.15 Hz, and the doffer frequency is 13.01 Hz.

[0045] (3) The single-layer fiber web output by the second pass of carding is cross-folded into a thick web by a web-laying machine, and the frequency of the small curtain is 3 Hz.

[0046](4) Send the cross-laid fiber thick net into the drafting machine and the pre-acupuncture machine in turn, and consolidate into a fiber mat through acupuncture. The needle density was 1750 needles / m; the acupuncture frequency w...

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Abstract

The invention relates to the technical field of composite material formation auxiliary materials and in particular to a green ventilated felt for forming a composite material and a preparation method of the green ventilated felt. The novel green ventilated felt is prepared by adopting natural bast fibers or blending 20-100 percent of the natural bast fibers and 0-80 percent of chemical fibers by mass percentage, and carrying out procedures of opening and carding the fibers, laying a fiber net, needling, and carrying out post trimming, wherein the feeding frequency of a carding machine is 1-30Hz, the cylinder rotation frequency is 10-30Hz, and the doffer rotation frequency is 5-25Hz; the felting needle setting density of a needling machine is 1000-5000 needles / m, the needling frequency is 400-500 times / min, the needling depth is 2-10mm, and the needling pass is 1-3 passes. According to the ventilated felt prepared by the method, the performance is close to that of the common chemical fiber ventilated felt, the air permeation rate at room temperature is about 350-3000L / m<2>.s, and formation of a composite material product can be guaranteed to be good. The preparation method is low in raw material cost, simple in process and lower in cost and can lower the whole cost of the composite material product.

Description

technical field [0001] The invention relates to the technical field of composite material molding auxiliary materials, in particular to a green air felt for composite material molding and a preparation method thereof. Background technique [0002] Composite autoclave molding technology has been widely used in the manufacture of high-performance advanced composite material structural parts such as aerospace due to its special molding process. Composite materials manufactured by autoclave molding technology have mechanical properties Excellent, good heat resistance, uniform resin content, compact internal structure and excellent internal quality. Air felt is a necessary auxiliary material in the molding process, and it is a channel for the discharge of small molecule gases during curing, which can ensure the full discharge of water vapor and small molecule gases during the curing process of the composite material. Its air permeability under high temperature and high pressure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/4382D04H1/425D04H1/46D04H1/70
CPCD04H1/4382D04H1/425D04H1/46D04H1/70
Inventor 梁子青王春红余金光张旭锋陈祯仝建峰
Owner ACC BEIJING SCI & TECH CO LTD
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