Sea-island composite fiber filtering material and preparation method thereof

A composite fiber and composite fiber web technology, applied in separation methods, chemical instruments and methods, filtration and separation, etc., to achieve the effect of high filtration interception efficiency and small air surface resistance

Active Publication Date: 2014-12-17
CHINA TEXTILE ACAD JIANGNAN BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]Non-woven filter material has been widely used in the air filtration industry due to its short processing process and low cost. Because the filter process is a deep filter, it is difficult to clean the filter material , short service life
Moreover, because the pore size of the filter material made of conventional fibers is relatively large compared with those fine particles, the dust particles are still easy to enter the filter material, which leads to shortening the injection period of the filter material and prolonging the life of the filter material. Air permeability and filtration efficiency are also reduced
Therefore, it is difficult for conventional fiber filter materials to meet the PM2.5 index requirements, or it needs to be combined with other more expensive high-performance fibers or films to improve its filtration performance.
[0006]At present, conventional island-in-the-sea composite fibers are made into finished non-woven fabrics by needle punching or spunlace, and then the superfine fiber filter material can be obtained by reducing the fiber size with caustic soda. The filtration accuracy is improved, but since the structure of the finished cloth has been fixed, the degree of fiber scattering after the reduction and fiber opening is small, and the filter aperture formed is relatively large for PM2.5 particles, and the fine dust particles are still easy to enter the filter material. As a result, the injection period of the filter material is shortened, and the air permeability and filtration efficiency of the filter material are also reduced over time.
In order to improve the surface filtering effect, the fibers need to be sanded to increase the degree of fiber chaos. In actual operation, it is difficult to ensure that the fibers are fully entangled, the filtering effect is not good, and the rough surface is formed, and the dust accumulation is difficult to remove.
If the fiber is covered with a film, the filter surface resistance is large, the energy consumption is high, and the cost of optimizing the film coating process is also high

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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  • Sea-island composite fiber filtering material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 1. Hybrid laying:

[0056] The COPET / PA 30 / 70 island-in-the-sea composite fiber, which accounts for 10% of the overall fiber web weight, is mixed with ordinary polyester fiber to lay the net, in which: the upper and lower sides are island-in-sea composite fiber web, and the middle is ordinary polyester fiber web and three layers of polyester base Cloth (0.5×0.5cm grid cloth).

[0057] 2. Acupuncture:

[0058] The acupuncture parameters are:

[0059] Acupuncture equipment 1 2 3、4 5、6 Acupuncture Upper stab Lower stab Upper stab, lower stab Upper stab, lower stab Acupuncture Depth (mm) 11 8 3 4 Acupuncture frequency (times / min) 750 950 670 670 Needle density: 4500 6000 8000 8000

[0060] 3. Fiber opening:

[0061] In this example, COPET / PA 30 / 70 sea-island composite fiber is used, which is composed of COPET and alkali-resistant components, and the COPET content is 3% (accounting for the weight of the whole fibe...

Embodiment 2

[0069] 1. Hybrid laying:

[0070] 20% COPET / PTFE 30 / 70 island-in-the-sea composite fibers accounting for 10% of the overall fiber web weight are mixed with ordinary polyester fibers to lay the web. The upper and lower sides are sea-island composite fiber nets, and the middle is ordinary polyester fiber net and three-layer polyester base cloth (0.5×0.5cm grid cloth).

[0071] 2. Acupuncture:

[0072] The acupuncture parameters are:

[0073] Acupuncture equipment 1 2 3、4 5、6 Acupuncture Upper stab Lower stab Upper stab, lower stab Upper stab, lower stab Acupuncture Depth (mm) 10 9 4 6 Acupuncture frequency (times / min) 770 980 650 650 Needle density: 4500 6000 8000 8000

[0074] 3. Fiber opening:

[0075] In this example, the island-in-the-sea composite fiber is composed of COPET and PTFE, and the COPET content is 6% (accounting for the weight of the whole fiber web), so the amount of caustic soda used for fiber openin...

Embodiment 3

[0082] 1. Hybrid laying:

[0083] The COPET / PPS 30 / 70 island-in-the-sea composite fiber, which accounts for 30% of the overall fiber web weight, is mixed with ordinary polyester fiber to lay the web. The upper and lower sides are sea-island composite fiber nets, and the middle is ordinary polyester fiber net and three-layer polyester base cloth (0.5×0.5cm grid cloth).

[0084] 2. Acupuncture:

[0085] The acupuncture parameters are:

[0086] Acupuncture equipment 1 2 3、4 5、6 Acupuncture Upper stab Lower stab Upper stab, lower stab Upper stab, lower stab Acupuncture Depth (mm) 10 9 4 6 Acupuncture frequency (times / min) 800 1000 700 700 Needle density: 4500 6000 8000 8000

[0087] 3. Fiber opening:

[0088] In this example, the island-in-the-sea composite fiber is composed of COPET and PPS, and the COPET content is 9% (accounting for the weight of the whole fiber web), so the amount of caustic soda used for fiber open...

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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Abstract

The invention discloses a sea-island composite fiber filtering material and a preparation method thereof, relating to the technical field of non-woven filtering materials. The sea-island composite fiber filtering material is characterized in that sea-island composite fiber meshes are arranged on an upper layer and a lower layer of the sea-island composite fiber filtering material respectively; a common polyester fiber mesh and three layers of polyester basic cloth are arranged between the upper-layer sea-island composite fiber mesh and the lower-layer sea-island composite fiber mesh. By virtue of improvement on the structure of the sea-island composite fiber filtering material, due to optimization of sea-island components of ultrafine composite fibers, a mixed mesh laying ratio of common fibers and pre-puncturing, splitting and spunlace reinforcing technologies, the prepared filtering material is smooth in surface, and the filtering and interception efficiency is high.

Description

[0001] Technical field: [0002] The invention relates to a non-woven filter material, in particular to an island-in-the-sea composite fiber filter material and a preparation method thereof. The filter material is used for filtering fine particle dust with a particle size below 2.5 microns. [0003] Background technique: [0004] PM2.5 mainly comes from the residues discharged through combustion in the process of daily power generation, industrial production, and automobile exhaust emissions, and most of them contain toxic substances such as heavy metals. Meteorologists and medical experts believe that hazy weather caused by fine particles is even more harmful to human health than sandstorms. Particles with a particle size of 10 microns or more will be kept out of the human nose; particles with a particle size between 2.5 microns and 10 microns can enter the upper respiratory tract, but some of them can be excreted through sputum, etc. The inner fluff blocks it, which i...

Claims

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/14B32B5/14B32B5/24
Inventor 张孝南贾佳李淑莉方虹天
Owner CHINA TEXTILE ACAD JIANGNAN BRANCH
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