MELT FILTER COMPRISING A DRIVE DEVICE FOR A ROTATABLE DISK SCREEN

摘要

The invention relates to a melt filter (1) comprising: at least one rotatable disk screen (2) which holds a screen insert (3), at least one screen insert (3) being displaceable inside the melt filter (1) by means of a drive device for the rotatable disk screen (2) in such a way that said screen insert (3) lies opposite a melt feed opening (6); and comprising a piston (13) for backflushing and/or pre-flooding. The object of the invention is to develop a melt filter such that the drive device for backflushing and/or pre-flooding is simplified. To achieve this object, the piston (13) is operatively connected to the drive device and can be driven by said drive device in order to carry out the backflushing and/or pre-flooding operation.

主权项

1. A melt filter for filtering plastic melts in or for connection with an extruder, comprising:
a rotatable sieve disk; a housing surrounding the sieve disk and formed offset from an axis thereof with a melt-feed opening; a drive for the stepwise rotation of the sieve disk; a plurality of screen inserts held in the disk in an annular array surrounding a rotation axis of the disk, at least one of the screen inserts within the filter housing being axially traversed by a melt stream when the one screen insert is aligned with the melt-feed opening; a piston/cylinder unit shiftable for backflushing or prefilling and connected with the drive so as to be drivable thereby for a backflushing and/or prefilling operation.