| 摘要 |
A method of injection moulding of plastics is to form a moulded article having regions (36, Figs 5a-c) therein of plastics material having different physical properties from adjacent regions. The method employs an injection moulding apparatus comprising a barrel (2, fig 1) containing a screw extending between a feed zone (4) supplied by a feed hopper 10 for plastics material, a compression zone (6) and a meÂtering zone (8) for delivery of molten plastics material to a mould. Bodies 22 are supplied in to the hopper (in the form of a ball, pill, ribbon etc) of a material creating a selected physical property in the moulded article; for instance colourants or RFID or other identification elements. The size of the bodies 22 being such as to be delivered to the metering zone (8) substantially unmixed with material having a different physical property and in sufficient quantity to form a said region in the moulded article. Bodies may have inter-linkages as shown in figures 4d-e. |
