B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/514
B29C 49/22 (2006.01) B29C 45/14 (2006.01)
Patent
CA 1037676
A B S T R A C T This relates to a process of forming a composite plastic article having at least two layers of material wherein a preformed liner is applied to a core conforming generally thereto. The liner covered core is placed in a parison mold having a cavity therein formed between the liner covered core and an outer mold member. Plastic is injected around the core and the liner so that the injected plastic fills the cavity in a manner such that substan- tially all air in the mold in the space between the core and liner and between the liner and the injected plastic is forced toward the portion last to be filled. Such air being vented from said portion. The process is so conducted and controlled that the total shrinkage of the injected plastic is greater than that of the liner. The resulting composite parison is then introduced into a blow mold and its component layers are expanded in unison in the blow mold to form a multilayered hollow article.
203810
Na
Valyi Emery I.
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