Filter means for high viscosity liquids and process for the filtration of molten polymers employing such filter means.

摘要

Filter means for high viscosity liquids involving a replaceable filtration unit generally of the self-sealing semidisposable type) having a screen (6) to support inert granular material (16) within a housing (9), wherein an improvement comprises the screen's rim being swaged into the housing (9), preferably with an interference fit within the range of 0.125 to 0.4 mm. The filter means of this invention are especially applicable to the extrusion of molten polymers into shaped articles, and accordingly the invention provides a process for such use.