Rotational moulding

Details Rotational moulding Rotational moulding

B - Operations, Transporting

29

C

B29C 41/04 (2006.01) B29C 44/04 (2006.01)

Patent

CA 2247557

A method of producing a plastics article having solid skin and a foam core by a rotational moulding process, comprises charging a mould with a skin-forming component and substantially simultaneously with a foam core-forming component of bulk density greater than O.5g/cc, providing a first heating stage in which the mould is heated to a first temperature and is rotated for a first predetermined time to form a substantially impervious skin within the mould, and providing a second heating stage in which the mould is heated to a higher second temperature and is rotated for a second predetermined time to cause foaming of said foam core-forming component, thereby forming a foam core within said substantially impervious skin.

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