Extruder and screw with wear surfaces

Details Extruder and screw with wear surfaces Extruder and screw with wear surfaces

1990-04-19

1992-08-04

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

With means adjusting synchronization or compensating for wear

425208, B29C 4738

Patent

active

051353784

ABSTRACT:
A twin screw extruder includes screw crests having wear surfaces formed of weld bead, deposited on the edges of the crests and into a groove in the crest to form a plurality of spaced dams or fences across the groove between the edges of the crest, and a molybdenum fitting between the dams. The dams or fences prevent unraveling of the entire molybdenum fitting, in the event of separation between the fitting and the screw.

REFERENCES:
patent: 2268905 (1942-01-01), Schaub et al.
patent: 3197814 (1965-08-01), Bond, Jr. et al.
patent: 3592128 (1971-07-01), French
patent: 4091693 (1978-05-01), Straub
patent: 4223601 (1980-09-01), Knuth et al.
patent: 4440076 (1984-04-01), Mansfield
patent: 4949836 (1990-08-01), Schostek
patent: 4996919 (1991-03-01), Mansfield

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