Injection molding screw for processing heat sensitive...

Details Injection molding screw for processing heat sensitive... Injection molding screw for processing heat sensitive...

B - Operations, Transporting

29

C

18/695, 18/733

B29C 45/00 (2006.01)

Patent

CA 1100729

ABSTRACT OF THE DISCLOSURE An injection molding screw for use in processing heat sensitive polymeric materials and a process for plasticat- ing such materials. The screw has an inlet end, a discharge end, means for mounting a backflow valve on the discharge end, and at least one section which applies high shear and high compression to the polymeric material and controls the material flow rate. A flighted screw section is disposed between the high shear and high compression section and the discharge end; that screw section includes means for decompres- sing the polymeric material and pumping it to the discharge end of the screw in the decompressed state at a rate at least equal to the pumping rate of the zone of high shear and high compression.

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