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Polytetrafluoroethylene (PTFE) membrane crack short-fiber re-splitting method and device used for same

A technology of polytetrafluoroethylene film and short fiber, which is applied in the direction of textiles and papermaking, and can solve the problems of high fiber branching rate, low percentage of fine fibers, and inability to continue production

Active Publication Date: 2016-06-01
灵氟隆新材料科技江苏有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for re-opening of polytetrafluoroethylene film-splitting staple fiber tow, so as to solve the problem of low fiber number percentage and fiber branching of polytetrafluoroethylene film-splitting short fibers produced by the prior art. High efficiency, and the existing high-density pin wheel high-speed carding and opening technology, easily lead to the defect that the tow breaks and cannot be continuously produced

Method used

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  • Polytetrafluoroethylene (PTFE) membrane crack short-fiber re-splitting method and device used for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The polytetrafluoroethylene film-split fiber tow made of flat fibers with a width of 6-140 microns and a thickness of 10-30 microns produced by the conventional film-split method is the primary tow, and then 10 bundles of the primary tow are The tow is synthesized into a strand and primary tow with a width of 15 mm and a thickness of 1.5 mm. After testing, the percentage of fibers with a width of less than 10 microns in the combined and primary tow is 18.6%, and the width is 10 to 30 microns. The percentage of the number of fibers is 36.6%, the percentage of the number of fibers with a width greater than 30 microns is 41.8%, and the fiber splitting rate is 72%.

[0063] Through the counterclockwise rotation of the upper rubber feeding roller 21 and the clockwise rotation of the lower rubber feeding roller 22, the merged tow is first fed with only one spunlace head at a linear speed of 10 m / min. The first drum-type hydroentanglement unit 3 of part 31 makes the tow run on...

Embodiment 2

[0067] The polytetrafluoroethylene film-split fiber tow made of flat fibers with a width of 6-140 microns and a thickness of 10-30 microns produced by the conventional film-split method is the primary tow, and then 22 bundles of the primary tow are The tow is synthesized into a strand and primary tow with a width of 30 mm and a thickness of 3 mm. After testing, the percentage of the number of fibers with a width of less than 10 microns in the combined and primary tow is 19.5%, and the width is 10 to 30 microns. The percentage of the number of fibers is 37.2%, the percentage of the number of fibers with a width greater than 30 microns is 42.3%, and the fiber splitting rate is 75%.

[0068] Through the counterclockwise rotation of the upper rubber feeding roller 21 and the clockwise rotation of the lower rubber feeding roller 22, the merged tow is first fed with only one spunlace head at a linear speed of 6.5 m / min. The first drum type hydroentanglement unit 3 of part 31 makes t...

Embodiment 3

[0072] The polytetrafluoroethylene film-split fiber tow made of flat fibers with a width of 6-140 microns and a thickness of 10-30 microns produced by the conventional film-split method is the primary tow, and then 35 bundles of the primary tow are The tow is synthesized into a strand and primary tow with a width of 50 mm and a thickness of 5 mm. After testing, the percentage of fibers with a width of less than 10 microns in the combined and primary tow is 21.6%, and the width is 10 to 30 microns. The percentage of the number of fibers is 38.6%, the percentage of the number of fibers with a width greater than 30 microns is 42.8%, and the fiber splitting rate is 78%.

[0073] Through the counterclockwise rotation of the upper rubber feeding roller 21 and the clockwise rotation of the lower rubber feeding roller 22, the merged tow is first fed with only one hydroentanglement head at a linear speed of 3 m / min. The first drum-type hydroentanglement unit 3 of part 31 makes the tow ...

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Abstract

The invention relates to a polytetrafluoroethylene (PTFE) membrane crack short-fiber re-splitting method and a device used for the same. The method comprises the steps of merging conventional PTFE membrane crack fiber bundles, then continuously feeding a drum-type spunlace unit only provided with a spunlace head for twice successively, and enabling the merged fiber bundles to be wound on a drum in a spiral form for 6-20 circles along a Z direction for running so as to enable the fiber bundles to be impacted by spunlace for 12-40 times along the positive surface direction and the negative surface direction for splitting to obtain the PTFE membrane crack fiber bundles which are high in fine fiber number percentage and low in fiber branching rate. By adopting a flexible splitting technology, the prepared fiber bundles are not easily broken by tearing, and re-splitting can be continuously carried out at high speed. The improved drum-type spunlace splitting device has the characteristics of being compact in structure, simple in operation and convenient in process adjustment. The fiber bundles prepared by the method are evenly carded into a web after being cut off, thus being widely used for preparing high-temperature-resistant filter material with small porosity and high efficiency of dust removal.

Description

technical field [0001] The invention relates to a method for manufacturing polytetrafluoroethylene split short fibers and a device thereof, in particular to a method for re-opening polytetrafluoroethylene split short fibers and a device thereof. The polytetrafluoroethylene film split short fiber produced by adopting the re-opening method and its device of the present invention has a high percentage of fine fibers and a low fiber branching rate. When used to prepare filter materials, the carding speed is high and the web is uniform. , the filter material made has small pores and high pore uniformity, and can be widely used in high-temperature resistant filter materials with high dust removal efficiency. Background technique [0002] PTFE has excellent physical and chemical properties, with a melting point of 327°C and a decomposition temperature of over 400°C; it has outstanding high and low temperature resistance and can work continuously at -190°C to 260°C; it has excellent...

Claims

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Application Information

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IPC IPC(8): D02J1/18
CPCD02J1/18
Inventor 薛士临徐玉康陈银青吴海波陈迎妹朱尚杜婷婷贾亚楠
Owner 灵氟隆新材料科技江苏有限公司
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