Patent ID: 6325922
Filing Date: 2001-12-04
Classification: B01D,B29B,B29C

Abstract:
A filter device for filtering plastics melts, comprising:a melt channel through which a plastics melt flows;an exchanging area;a filter wheel having a plurality of cavities therein, wherein said filter wheel pivots the plurality of cavities between said melt channel and said exchanging area;a plurality of screening elements covering said cavities in said filter wheel;a melt inflow line upstream of said filter wheel and a melt outflow line downstream of said filter wheel in fluid communication with said melt channel;a first pressure sensor arranged in said melt inflow line;a second pressure sensor arranged in said melt outflow line;a removal/fitting opening formed in said exchanging area of the filter device for exchanging fresh or cleaned screening elements for soiled screening elements;a melt return line which branches off from said melt outflow line and includes a pump and a first melt discharge line for transporting filtered plastics melt into a backflushing slot of the filter device to backflush said screening elements;an accelerator connected to said first melt discharge line for increasing pressure in said first melt discharge line for backflushing said screening elements; anda second melt return/discharge line, leading away from the filter device on the opposite side of the filter wheel from the backflushing slot, and a valve for selectively directing backflushed plastics melt to said melt inflow line or a disposal line.