Composite needled filter felt

Abstract

The invention discloses a composite needled filter felt, and relates to a filtering material for a ceramic industry. The filter felt consists of a glass fiber base cloth layer (1), a polyester fiber and polypropylene fiber composite layer (2) and a polytetrafluoroethylene-impregnated (PTFE) coating layer (3), wherein the polyester fiber and polypropylene fiber composite layer (2) is arranged on the outer layer of the glass fiber base cloth layer (1) and covered by the PTFE-impregnated coating layer (3); and the process flow of the filter felt comprises the following steps of: preparing polyester fiber and polypropylene fiber, opening, carding and netting; preparing glass fiber base cloth; opening, carding and netting; pre-needling; primarily needling; singeing; calendering; and impregnating to obtain the finished product. The filter felt has the advantages of high temperature resistance, high ventilation, high break strength in warp and weft directions, low elongation and long service life.

Description

Technical field: [0001] The invention relates to a filter material used in the ceramic industry, in particular to a composite needle-punched filter felt. Background technique: [0002] At present, a large number of bag-type dust removal technologies are being developed and applied in China. In terms of needle-punched filter materials, they are developing in the direction of various materials and various processing spinning machines. There are roughly three types of needle-punched felt filter bags used in the ceramic industry: the first one is a needle-punched filter cloth product made of acrylic fiber imported from Japan. Its scientific name is homopolyacrylonitrile, and it can only be produced in Japan. The price is extremely expensive, the ceramic industry itself is a low value-added industry, and the fiber products that the filter bag relies on imports have increased the burden on the enterprise, the production cost has increased, and the survival of the enterprise is in ...

AI Technical Summary

Problems solved by technology

There are roughly three types of needle-punched felt filter bags used in the ceramic industry: the first one is a needle-punched filter cloth product made of acrylic fiber imported from Japan. Its scientific name is homopolyacrylonitrile, and it can only be produced in Japan. The price is extremely expensive, the ceramic industry itself is a low value-added industry, and the fiber products that the filter bag relies on imports have increased the burden on the enterprise, the production cost has increased, and the survival of the enterprise is in crisis; the second product is polypropylene needle felt. The high temperature resistance (temperature resistance is only 90°) results in a greatly shortened service life in the industrial and mining of the ceramic industry, which is not suitable for the industrial and mining conditions of the ceramic industry; and the third filter material is polyester needle felt filter material, its temperature resistance It meets the industrial and mining requirements of the ceramic industry, but its acid and alkali resistance cannot meet the requirements, and the acid and alkali resistance of the ceramic industry must be excellent, that is, the pH value is between 2-14, which also hinders the ceramic production process.

[0003] It can be seen from the above that the existing filter materials in the ceramic industry can meet the requirements of industrial and mining conditions with a single index, but the comprehensive performance is far from the requirements of the industrial and mining conditions of the ceramic industry.

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