DIRT-REPELLENT MONOFILAMENT FOR PAPER MACHINE FILTERS, PROCESS FOR ITS PRODUCTION AND ITS USE

摘要

The dirt-repellent monofilament with a toughness of at least 36 cN/tex and an extension of under 44 % has a soiling index AI>2 after five soiling and cleaning cycles. To manufacture the dirt-repellent monofilaments, a copolymer with a melting point of 255 to 275 C and consisting of alkenes and perfluoroalkenes is added to a polymer melt of polyethylene terephthalate before extrusion. The dirt-repellent monofilament is advantageously used in the manufacture of cleaning filters for the dry section of a paper machine, i.e. paper machine fabric filters. It may also be used to produce fabrics for general use as technical fabrics which have to be cleaned in difficult conditions.