FILTER DEVICE FOR CLEANING PLASTICS MELTS.

摘要

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.