| 摘要 |
The invention relates to an injection-moulding machine for producing multilayer plastic moulded articles from a uniform synthetic material comprising: - a plasticising unit (1) with a plasticising screw (7); - an injection-moulding tool (10) with a pair of moulding cavities (13, 15) of which an upstream cavity (13) is intended for a primary moulded part (14) and a downstream cavity (15) is intended for a secondary moulded part (16) to be injection-moulded onto a primary moulded part (14'), with a distributor (21) that connects the injection nozzle (20) of the plasticising unit (1) via two branch channels (23, 25) to the upstream and downstream cavities (13, 15), and with a respective locking member (24 26) in the two branch channels (23, 25), said invention further relating to the following operating method for injection moulding: = injecting the primary moulded part (14) in the upstream cavity (13) with the locking member (26) in the branch channel (25) to the downstream cavity (15) closed; = in the same screw injection stroke, injection of the secondary moulded part (16) onto a primary moulded part (14') in the downstream cavity (15) with the locking member (26) in the branch channel (25) leading to the downstream cavity (15) open, with simultaneous cooling of the primary moulded part (14) in the upstream cavity (13) and = simultaneous application of extra pressure to the upstream and downstream cavities (13, 15) with opened locking members (24, 26) in the branch channels (23, 25) leading to the upstream and downstream cavities (13, 15) at the end of the same injection stroke of the plasticising screw (7), while cooling the primary and secondary moulded parts (14, 16). |
