Filtering apparatus for synthetic thermoplastics material

Apparatus for filtering thermoplastic synthetic plastics comprising;

• a housing having at least one supply channel for material to be filtered and at least one discharge channel for filtered material;
• a carrier body including a screen arrangement having at least two screen nests, said carrier body further including a separation wall between said screen nests, a distribution space disposed at an inflow side of each screen nest, a collection space disposed at an outflow side of each screen nest, and a backwashing channel which directly joins the collection spaces of said screen nests, said backwashing channel passing through said separation wall between said screen nests,
• said carrier body being displaceably guided in said housing for movement between a filtration position and a different backwashing position for each of said screen nests,
• said distribution spaces being joined to said supply channel by inflow channels and said collection spaces being joined to said discharge channel by outflow channels when said carrier body is in said filtration position,
• said filtered material being supplied from the collection space of one screen nest to the collection space of another screen nest by said backwashing channel, said distibution space of said other screen nest discharging said contaminants from said apparatus, and said outflow channel of said other screen nest being closed when said carrier body is in one of said backwashing positions.