B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/660
B29C 44/04 (2006.01) B29C 45/16 (2006.01) B29C 45/00 (2006.01)
Patent
CA 1110814
ABSTRACT OF THE DISCLOSURE A single screw injection device or extruder se- quentially injects skin and foamed plastics melt into a mould to produce structural skin covered foam moulded parts free from swirl marks. A single extrusion screw or plas- ticator selectively feeds, compresses and meters a plastics melt to a first injector for skin melt injection or to a gas injection well where it meters gas flow into the melt, mixes the gas and melt to form a foam and feeds the foam to a second injector for foam melt injection into the mould. A valve controls the flow of the plastics melt and the foamed plastics melt to a single injection nozzle for dis- charge into the mould. In sandwich moulding, a small amount of the unfoamed melt is first injected to form the skin for the moulded article and then the valve is shifted to connect the nozzle with the foamed melt from the screw whereupon the injector forces the foamed melt through the nozzle into the mould to overlie the skin melt. The skin melt and the foamed melt are fed through the same nozzle and swirling in the mould is avoided.
301622
Beloit Corporation
Ridout & Maybee Llp
LandOfFree
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