Bonded yarn bundle, and textile sheet materials obtainable therefrom

Abstract

Bonded yarn bundle, manufacture thereof and textile sheet materials obtainable therefrom. There is described a yarn bundle having a tenacity of at least 42 cN/tex, comprising at least one twisted multifilament yarn composed of a first synthetic polymer, for example polyethylene terephthalate, whose individual filaments have become bonded together over essentially the entire thread cross-section by the melting of a second thermoplastic synthetic polymer whose melting point is at least 10.degree. C. below the melting or decomposition point of the first synthetic polymer. The yarn bundles are notable for high strength, good flexural stiffness and good hydrolysis resistance and are usable in particular for manufacturing textile sheet materials for use in hot, moist environments, in particular for use as wire cloths for papermaking machines.