B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/924
B29C 5/04 (1980.01)
Patent
CA 1075867
ABSTRACT An apparatus is provided for moulding a hollow plastic article. This apparatus comprises a mould having an axis of rotation which is disposed during one phase of the moulding operation in horizontal attitude. The mould has an opening symmetrically disposed about this axis, which opening is of a size to enable the removal of the moulded article from the mould when moulding is completed. A charge-retaining member is provided in association with the mould adjacent the aforesaid opening, this member being perpendicular to the a- foresaid axis and defining an opening symmetrically disposed about this axis and of a size to permit the insertion of a plastic charge into the mould during its rotation. The afore- said member can be integral with the mould or can be part of a removable cover. An elongated burner is provided extending along the mould parallel to the horizontal axis, the burner having an extent such that it does not extend beyond the change-retaining member. Blowers are provided for blowing cooling air onto the mould and through the aforesaid openings when moulding has been completed. Insofar as the associated method is concerned, the aforesaid mould can be preheated and a plastic charge inserted into the mould after this preheating, the charge being fused and thereafter cooled, the article which is formed being removed from the mould via the opening therein or via the opening in the charge-retaining member. The plastic charge is heated generally exclusively by heat passing through the mould, this heat being generally prevented from passing through either of the aforesaid openings.
254817
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