Filter device for cleaning plastics melts

US6325922A · kind A · utility

Assignee

• Arteva Technologies, S.A.R.L. · CH

Inventors

• Rainer Schaller · Wertingen, DE
• Eduard Lindner · Wertingen, DE
• Ralf Henke · Zeven, DE
• Detlef Gneuss · Bad Oeynhausen, DE

Key dates

• Filing date: May 9, 2000
• Grant date: Dec 4, 2001
• Expiry date: May 9, 2020

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C48/03
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A filter device for filtering plastic melts includes a filter wheel having cavities which are covered by screening elements. A pressure sensor is provided in a melt inflow line upstream of the filter wheel. A pressure sensor is also provided in a melt outflow line downstream of the filter wheel. The pressure sensors measure the pressure drop across the filter. The melt inflow and outflow lines are connected to a melt channel in the filter device, respectively. A melt return line is in connection via a pump and a discharge line with a backflushing slot. The discharge line is connected to an accelerator for increasing pressure in surges. A further melt return/discharge line is connected via a 3-way valve and a return line to the melt inflow line or to a disposal line.