SCREEN UNIT FOR VISCOUS MASS

摘要

During the processing of viscous masses, for example recycled molten plastic, it is important that impurities in the form of solid particles should be removed from the viscous mass. A screen unit with a substantially cylindrical hollow screen element (8) is used for this purpose. The viscous mass flows through the screen element in the radial direction. The screen element (8) can be cleaned by backflushing. The means for the backflushing comprise backflush channels (11) which can be placed in communication with an outflow channel (16) by way of a shut-off element (14) which can be opened. The means for backflushing further comprise a pressure element (17) which can be operated in order to flush back the viscous mass at a pressure which is higher than the pressure in the supply channel (2). The pressure element (17) interacts with the shut-off element (14) in order to discharge the solid particles screened off by the screen element.