Plastic drum

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B - Operations, Transporting

29

D

18/509

B29D 23/03 (1980.01)

Patent

CA 1114116

ABSTRACT OF THE DISCLOSURE The invention provides a method of forming a blow- moulded drum of thermo-plastics material provided with projecting hoops, comprising, blow-moulding a drum in a mould, the mould being formed of laterally displaceable mould sections which, in a closed position, define a mould cavity having side walls, the mould sections being further divided into separate parts in planes in which drum chimes are to be formed, the separate parts of the mould sections defining between them in an extended position of the mould parts, gaps in the side walls of the mould cavity whereby, during the blow-moulding step, material is blown into the gaps to form annular rings around the drum, and contracting the mould parts along the drum axis to stamp the annular rings into the projecting chimes. The drum has frusto-conical end portions disposed outwardly of the chimes.

297588

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