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

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

Active Publication Date: 2014-08-27
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 existing filter materials, the invention provides a composite polyphenylene sulfide fiber filter material

Method used

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

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Effect test

preparation example Construction

[0025] The preparation method for preparing the composite polyphenylene sulfide fiber filter material includes the following steps: making polyphenylene sulfide fibers, polytetrafluoroethylene fibers, meta-aramid fibers or polyimide fibers through acupuncture and heat setting steps. Form a support layer; transport the polyphenylene sulfide resin melt to the melt-blown die head, spray it out under the action of hot air at 300-380°C, and stretch it into a melt flow, and the melt flow adheres to the support layer The fiber web layer is formed on the upper layer; the fiber web layer and the support layer are combined through needle punching or hydroentangling processes to form a composite felt, and the PTFE film with a microporous structure is adhered to the fiber web layer by thermal bonding, and passed through a hot roller. Roll forming to form a composite polyphenylene sulfide filter material.

[0026] The needle punching density and depth of the needle punching step in the pro...

Embodiment 1

[0042] PPS staple fibers (length 5mm, fineness 2.2dtex) are opened, carded into a web, and laid into a web, and then laminated with PPS yarn base cloth and enter the pre-needling, second and The third needle-punching, and then heat-setting by tentering to become a PPS needle-punched felt (supporting layer), and the heat-setting temperature is 230°C. Then the needle felt plain felt will be pulled into the melt blown process.

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

[0044] The polyphenylene sulfide resin is processed into a viscous fluid melt in a single-screw extruder, and the maximum temperature of the screw is 340°C (at 340°C, the melt temperature is...

Embodiment 2

[0051] PTFE fiber (length 51mm, fineness 3.0dtex) is opened, carded into a web, and laid into a web, and then laminated with PTFE yarn base cloth and enters the pre-needling and second needling , and then heat-set by tentering to become a PTFE needle-punched felt, and the heat-setting temperature is 250°C. Then the needle felt plain felt will be pulled into the melt blown process.

[0052] figure 1 A schematic diagram of the process flow 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 rolling forming roll 6.

[0053] The polyphenylene sulfide resin is processed into a viscous fluid melt in a single-screw extruder, and the maximum temperature of the screw is 340°C (at 340°C, the melt temperature is 1.5×10~2.5×10 3 sec -1 The shear v...

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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, its preparation method and filter bag made from it. Background technique [0002] Polyphenylene sulfide fiber filter material is currently the preferred filter material for flue bag dust removal in coal-fired power plants. The current filter materials are all made of polyphenylene sulfide short fibers through the acupuncture process to make the ash-facing surface, and then adhere to the PTFE porous membrane or coat the PTFE emulsion on the ash-facing surface to form a film to form polyphenylene sulfide. Fibrous filter material. [0003] In order to improve the filtration efficiency of the filter material and prolong 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-punched felt filter mat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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