FELT-LIKE LAYERED COMPOSITE OF PTFE AND GLASS PAPER

摘要

A felt-like layered composite of the following structure: a. a first layer of a predominantly horizontal coplanar superimposed layers of filamentary polytetrafluoroethylene components interrupted by occasional interlayered orientation; b. a thin high density nonwoven layer of fine glass staple fibers; c. a scrim fabric of polytetrafluoro ethylene fibers and d. a second predominantly horizontal coplanar superimposed layers of filamentary polytetrafluoroethylene components interrupted by occasional interlayer orientation; wherein the layers are mechanically bonded together by filamentary polytetrafluoroethylene components extending vertically throughout the composite and a process for making this composite; the composite is useful as a filter fabric and is primarily used for bag filters to remove fly ash from the gaseous combustion products of coal fired furnaces and boilers.