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Microfiber split film filter felt and method of making same

A technology of split membrane and fibrillated membrane, applied in the field of felt products, can solve the problems of difficult conversion of fine fibers and microfibers, and achieve the effects of reducing the total weight, simplifying the production process, and improving the filtration efficiency

Inactive Publication Date: 2009-12-30
TEADIT IND E COMERCIO LTD (BR)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] There are several advantages to using a nonwoven mat formed of microfibers for filtration applications; however, it is very difficult to open, clean and orient the staple fibers into the carding process of the web, which is cross-laid and formed into a batt The most important thing is to convert fine fibers and microfibers into webs because of the number of neps (small knots that entangle fibers) and the amount of fiber breakage

Method used

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  • Microfiber split film filter felt and method of making same
  • Microfiber split film filter felt and method of making same
  • Microfiber split film filter felt and method of making same

Examples

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Embodiment 1

[0043] One embodiment of the felt material of the present invention was manufactured as follows:

[0044]The PTFE resin fine powder was mixed with a liquid lubricant (extrusion aid) at a mixing ratio of 22% lubricant and 78% PTFE. In the following steps, the material is pressed, formed into a billet and extruded in a ram extruder to obtain an extruded preform.

[0045] Subsequently, the extruded preform was conveyed through calender rolls to form a strip with a thickness of 100 μm, followed by volatilization and removal of the liquid lubricant by conveying the strip through an oven at a temperature of 220°C. The dried web was uniaxially stretched in the longitudinal direction to 6 times its original length by passing the dried web through tension rolls operated at a draw ratio of 6:1 and a temperature of 350°C. Formed with a thickness of 33μm and a density of 2.0g / cm 3 film. In the next step, the film is split with a needle-bladed roller to produce a web. The web was then ...

Embodiment 2

[0049] In a similar manner as in Example 1, an embodiment of the felt material according to the invention was produced in a different strip material. The tape used in Example 2 had a 1.1 g / cm 3 Density. The same extrudate as in Example 1 was passed through calender rolls to form a strip with a thickness of 1000 μm, which was then passed through an oven at a temperature of 220° C. to volatilize and remove the liquid lubricant. The dried tape was stretched longitudinally to 150 times its original length to form a thickness of 32 μm and a density of 1.1 g / cm 3 film. In the next step, the film is split with a needle-bladed roller to produce a web. The web was then further stretched in the cross direction to 10 times its original width by passing over curved bars and then laid onto a conveyor belt via a crosslapper to form a batt with a mesh structure on a PTFE woven scrim . The material was processed by needling to obtain a weight of 385 g / m 2 felt and wind the latter onto r...

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Abstract

A nonwoven felt formed from fluoropolymer film, which is split and fibrillated to form a network structure, and then entangled.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of and priority to U.S. Nonprovisional Application No. 11 / 969,904, filed January 6, 2008, and U.S. Provisional Application No. 60 / 884,078, filed January 9, 2007, both incorporated by reference manner is incorporated herein in its entirety. [0003] Statement Regarding Federally Sponsored Research or Development [0004] none [0005] Refer to the appendix [0006] none technical field [0007] The invention disclosed and taught herein relates generally to felts; more particularly, to felts for use as high temperature gas filtration media. Background technique [0008] Techniques for producing synthetic fiber mats are well known in the art. Felts (ie, nonwoven, unbonded fibrous structures whose cohesion and strength derive from interfiber entanglements and attendant friction) represent an old fashioned fabric. Felt materials have been widely used in various industrial applicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H13/00B01D71/36B01D39/00C08J5/18
CPCB01D2239/1208B01D2239/083B01D39/083B01D39/1692B01D2239/0414B01D39/1623B01D2239/0663B01D2239/0609B01D2239/10B01D2239/065D04H13/00B01D2239/1291B01D2239/0681B01D2239/1258B01D39/2017B01D2239/0659Y10T442/60Y10T442/682Y10T442/689Y10T442/159B01D39/02B01D71/36
Inventor 马塞洛·C·阿多诺乔斯·A·D·A·内托
Owner TEADIT IND E COMERCIO LTD (BR)