B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 55/00 (2006.01) B29C 45/16 (2006.01) B29C 45/17 (2006.01) B29C 49/42 (2006.01) B29D 22/00 (2006.01)
Patent
CA 2299011
A hollow plastic article consisting of several materials has a wall in which the materials are joined together via their contact surface. At the closed lower end (10b) of the plastic article (10) there are sprues (51, 52, 53). Because the lower end (10b) is amorphous inside the wall thickness x in spite of the sprues, a homogeneous structure of the plastic article is achieved. This can be realized by injection moulding in several steps in mould cavities in which case the injection preferably is carried out with open shut-off nozzle, or when the first material is injected a long sprue stalk is produced in order to keep the closed lower end (10b) amorphous, or to keep any crystalline areas outside the wall thickness (Fig. 2).
Hehl Karl
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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