METHOD FOR PROCESSING POLYTETRAFLUOROETHYLENE FILAMENT WITH CIRCULAR CROSS-SECTION USING CUTTING AND HOT-MELT FORMING PROCESS

摘要

Disclosed is a method for processing a polytetrafluoroethylene filament with a circular cross-section using a cutting and hot-melt forming process. The filament is made by mixing polytetrafluoroethylene dispersive resin powder with a liquid lubricant, and subjecting same to the processes of material mixing, green compacting, calendering, longitudinal stretching, cutting, hot-melt forming etc. The method disclosed in the present invention is simple and has a low cost. The polytetrafluoroethylene filament prepared therefrom has a quasi-circular cross-section shape and a strength of 4.3 - 3.2 cN/dtex, which can substantially decrease the damage of a needle or a spunlace to the filament during the process. The filament can be widely used for treating a high-temperature tail gas in industries of waste incineration plants, coal-fired power plants, cements etc., and has notable economic and social benefits.