Composite type fiber filtering material and preparation method thereof as well as filtering bag

A fiber filtration and composite technology, applied in the field of composite fiber filter materials and filter bags, can solve the problems of short service life and low over-efficiency, and achieve the effects of improving filtration efficiency, good filtration effect, and simple and convenient preparation method.

Active Publication Date: 2012-06-27
CHINESE TEXTILE ACAD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the defects of low efficiency and short service life existing in exis...

Method used

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  • Composite type fiber filtering material and preparation method thereof as well as filtering bag
  • Composite type fiber filtering material and preparation method thereof as well as filtering bag

Examples

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preparation example Construction

[0025] The preparation method for preparing the composite polyphenylene sulfide fiber filter material includes the following steps: the polyphenylene sulfide fiber, polytetrafluoroethylene fiber, meta-aramid fiber or polyimide fiber is prepared by needle punching and heat setting steps. To form a support layer, the polyphenylene sulfide resin melt is transported to the melt-blowing die, sprayed out under the action of hot air at 300-380°C, and stretched into a melt flow, and the melt flow adheres to the support layer The fiber mesh layer is formed on the upper surface; the fiber mesh layer and the supporting layer are combined together through a needle punching or spunlacing process to form a composite felt. The PTFE film with a microporous structure is adhered to the fiber mesh layer by thermal bonding, and then heated by a hot roller. Press-rolling to form a composite polyphenylene sulfide filter material.

[0026] The needling density and depth of the needling step in the proc...

Embodiment 1

[0042] The polyphenylene sulfide staple fiber (length 5mm, fineness 2.2dtex) is opened, carded into a net, and laid into a net process, and then laminated with the polyphenylene sulfide yarn base fabric, and then enters the pre-needling, second pass and The third needling process is then heat-set by tentering to become a polyphenylene sulfide needle felt (support layer), and the heat-setting temperature is 230°C. Then the needled felt will be drawn into the melt blown process.

[0043] figure 1 The process flow diagram of the composite filter material provided in this embodiment is shown. The device for preparing the composite type includes the following components: melt blowing die head 1, melt metering pump, screw extruder, high-pressure air heating device, needle felt driving wheel and hot forming roll.

[0044] Polyphenylene sulfide resin is processed into a viscous liquid melt in a single screw extruder. The maximum screw temperature is 340℃ (at 340℃, the melt is between 1.5...

Embodiment 2

[0051] The PTFE fiber (length 51mm, fineness 3.0dtex) is opened, carded into a net, and layed into a net process, and then laminated with the PTFE yarn base fabric, and then enters the pre-needling and second needle punching , And then heat-set into PTFE needle felt felt by tentering, the heat-set temperature is 250℃. Then the needled felt will be drawn into the melt blown process.

[0052] figure 1 The process flow diagram of the composite filter material provided in this embodiment is shown. The device for preparing the composite type includes the following components: a melt blowing die head 1, a melt metering pump, a screw extruder, a high-pressure air heating device, a needle felt driving wheel 5, and a hot forming roll 6.

[0053] Polyphenylene sulfide resin is processed into a viscous liquid melt in a single screw extruder. The maximum screw temperature is 340℃ (at 340℃, the melt is between 1.5×10~2.5×10 3 sec -1 The shear viscosity within the shear rate range is 3.0×10 2 ...

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Abstract

The invention provides a composite type fiber filtering material and a preparation method thereof as well as a filtering bag made by the same. The composite type fiber filtering material comprises a supporting layer, a fiber web layer and a PTFE (Polytetrafluoroethylene) covering film, wherein the supporting layer is made of polyphenylene sulfide fiber, polytetrafluoroethylene fiber, meta-aramid fiber or polyimide fiber; the fiber web layer is made of polyphenylene sulfide fiber and arranged on the supporting layer; and the PTFE covering film is arranged on the fiber web layer; and the fiber web layer is formed by polyphenylene sulfide fiber webs with an average diameter of 2-10 microns. According to the composite type fiber filtering material disclosed by the invention, the fiber web layer, which is formed by ultra-thin fiber webs on the traditional acupuncture filtering felt through a melt spinning process, is added. The fiber web layer is in a more abundant microcellular structure with a smaller aperture, so that smoke and tiny dust are effectively separated outside an ash collecting layer, the tiny dust is prevented from entering into the filtering material, and the filtering efficiency is improved.

Description

Technical field [0001] The invention relates to a composite fiber filter material, a preparation method thereof and a filter bag made from the composite fiber filter material. Background technique [0002] Polyphenylene sulfide fiber filter material is currently the preferred filter material for flue gas bag dust removal in coal-fired power plants. The current filter materials are made of short polyphenylene sulfide fibers through acupuncture process to make a dust-facing surface, and then stick a PTFE porous membrane or coat PTFE emulsion on the dust-facing surface to form a film to form polyphenylene sulfide Fiber filter material. [0003] In order to improve the filtration efficiency of the filter material and extend its service life, a number of invention patents related to the preparation technology and product form have been published at home and abroad. [0004] Invention patent application CN101406779A discloses a multi-layer composite polyphenylene sulfide needle felt filt...

Claims

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Application Information

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IPC IPC(8): B01D39/16B01D46/02B32B27/08B32B27/02B32B27/30B32B27/28B32B37/06B32B37/10
Inventor 崔宁张孝南迟克栋
Owner CHINESE TEXTILE ACAD
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