Screw extruder for thermoplastic synthetic foams

Details Screw extruder for thermoplastic synthetic foams Screw extruder for thermoplastic synthetic foams

B - Operations, Transporting

29

C

18/665

B29C 47/80 (2006.01) B29C 47/36 (2006.01)

Patent

CA 1109621

ABSTRACT OF THE SPECIFICATION A cooling/mixing device having no moving parts is interposed between the extrusion head and the screw barrel of the extruder. The device comprises a cooled metallic block having a pair of large opposed faces and a plurality of rows of through-passages interconnecting said faces. Inlet and outlet manifold channels for the melt extend along the rows of passages so that a lateral wall of a manifold channel is formed by its respective face of the block. Partial flows of melt obtained from the flow in the inlet manifold channel are individually cooled in the passages and emerge from the latter sub- stantially perpendicularly to the outlet flow in the outlet manifold channel to produce turbulent mixing. Preferably a further similar cooling block is provided, acting in series with the first block. The blocks are preferably in form of cylindrical sleeves with through- passages directed radially while the manifold channel are directed axially at the inside and at the outside of the sleeves.

321979

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