Apparatus for filtering plastic melts

US5607585A · kind A · utility

Assignee

• Barmag AG · DE

Inventors

• Knut Hobrecht · Solingen, DE
• Jörg Alexander · Remscheid, DE

Key dates

• Filing date: Jul 17, 1995
• Grant date: Mar 4, 1997
• Expiry date: Jul 17, 2015

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C48/12
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

An apparatus for filtering plastic melts, which comprises a filter housing (1) having at least one cylindrical filter receiving chamber (8), and with a tubular filter cartridge (2) mounted in the chamber. An annular melt flow space (9) for the plastic melt is defined between the outer periphery of the filter and the inside wall of the chamber, such that the melt flows radially inwardly through the filter medium of the filter cartridge and into the central passage of the filter cartridge and then to an outlet opening of the housing. An additional melt flow outlet channel (12) is positioned adjacent the downstream end of the filter cartridge, and in one embodiment, the melt is able to flow via the additional melt flow outflow channel to the outside of the housing. In a second embodiment, the melt can flow via the additional melt flow outflow channel and an additional filter (11) and return to the main flow. The flow resistance of the additional melt outflow channel (12) is dependent only on the maximally acceptable residence time of the melt.