VOLUMINÖSE LANGFASER UND SPLIT-GARN AUS POLYTETRAFLUORETHYTEN, VERFAHREN ZU IHREHERSTELLUNG UND HERSTELLUNG VON BAUMWOLLÄHNLICHEM MATERIAL UNTER VERWENDUNG DIESER FASER UND DIESES GARNS UND STOFF FÜR STAUBFILTER

摘要

The split PTFE yarn and PTFE filament which are bulky and excellent in the feeling and have good intermingling property can be obtained and the cotton-like PTFE materials can be produced therefrom efficiently at a low percentage of dropped fibers. Further the filter cloth for dust collection which is obtained from those cotton-like materials has a high collection efficiency. The present invention can provide the split yarn having a network structure and obtained by splitting a uniaxially stretched PTFE film in the stretched direction with a needle blade roll; the filament having branches and obtained by cutting the network structure of the split yarn in a longitudinal direction; the methods of production thereof; the method of producing the cotton-like materials by cutting the split yarn or filament and then opening; and a filter cloth for dust collection obtained from the cotton-like materials. <IMAGE>