초록 ▼

A glass-fiber filter tube and process of preparing the filter tube, which filter tube comprises a plurality of randomly disposed, fine glass fibers bonded, at the junction of the fibers, with a fused thermoplastic fluorocarbon resin, which filter tube may also include a reinforcing support scrim she

A glass-fiber filter tube and process of preparing the filter tube, which filter tube comprises a plurality of randomly disposed, fine glass fibers bonded, at the junction of the fibers, with a fused thermoplastic fluorocarbon resin, which filter tube may also include a reinforcing support scrim sheet incorporated integrally therein.

대표청구항 ▼

In a process for preparing a filter tube, which process comprises: preparing a plurality of interrelated, randomly dispersed, inorganic fibers having a diameter of from about 0.01 to 10 microns into a filter tube with interstices between the fibers; impregnatinG the filter tube with a bonding agent

In a process for preparing a filter tube, which process comprises: preparing a plurality of interrelated, randomly dispersed, inorganic fibers having a diameter of from about 0.01 to 10 microns into a filter tube with interstices between the fibers; impregnatinG the filter tube with a bonding agent for the fibers; and heating the impregnated filter tube to a temperature sufficient to bond the junction of the fiber crossover points in the filter tube with the bonding agent, the improvement which comprises: (a) impregnating the prepared filter tube with an aqueous emulsion containing a dispersed fluorocarbon polymer as the bonding agent; and (b) coagulating the fluorocarbon polymer in the impregnated filter tube prior to any substantial coagulation by airdrying of the emulsion in the tube and prior to heating to bond the fibers, to provide a filter tube characterized by a substantially uniform deposition of coagulated and bonded fluorocarbon polymer bonding agent throughout the thickness of the wall of the filter tube, thereby providing a filter tube of improved strength.