KCH HYBRID SCREEN CHANGERS

摘要

A screen filter comprises a housing defining a melt passage for molten thermoplastic material. A guide channel in the housing is configured and arranged to direct a continuous screen filter across the melt passage. A gate blocks an exit section of the guide channel during initial formation of a solidified plug of the material being filtered on the screen filter. The gate is then partially withdrawn to an intermediate position at which it acts as a brake to releasably impede movement of the plug and screen filter until a screen change is required. The gate is then fully withdrawn and the screen filter and the plug formed thereon are pulled across the melt passage by an exterior clamp mechanism.

主权项

1. Apparatus for filtering a thermoplastic material heated to a flowable state, said apparatus comprising:
a housing defining a through melt passage for the heated thermoplastic material, and a guide channel having entry and exit sections arranged on opposite sides of said melt passage and configured to direct a continuous screen filter transversely across said melt passage from an entry side to an exit side of said housing; a clamp assembly for releasably gripping said screen filter at a first location on the exit side of said housing; and first operating means for shifting said clamp assembly to a second location remote from said first location to thereby incrementally advance said screen filter across said melt passage.