| 摘要 |
An automatic rotamoulding apparatus in which hollow plastics products can be manufactured by rotational moulding with minimal or no manual intervention. A rotatable mould assembly (42) of the apparatus incorporates a pair of moulds (40) comprising first and second components (64, 66) forming the lid and base respectively of the respective moulds. The lid (64) of the mould is movable relative to the base (66) between a closed position in which the mould is ready to receive a shot of plastics material powder and an opened position in which the finished rotamoulded product can be removed. Each mould (40) is provided with a pair of pneumatic rams (70) for moving the lid (66) between the opened and closed positions. Each rotatable mould (40) is provided with a plurality of electric heating elements (74) for heating the lid and base (64, 66) of the moulds during rotational moulding. Each rotatable mould (40) is also provided with a plurality of temperature sensing devices (84) arranged to sense the temperature at the inner surface of the mould. An injector (90) is provided for delivering powder to the mould (40) during rotation of the assembly (42). The whole of the moulding process is computer controlled, including delivering a shot of powder to the mould, rotating the mould, controlling the heating of the mould in accordance with a pre-determined temperature profile, cooling the mould and ejecting the finished rotamoulded product. Advantages include reduced labour content, decreased production cycle time, more efficient "double dump" procedure and improved quality control.
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