| 摘要 |
<p>The present invention is concerned with a machine for the production by injection welding of articles of large size and/or complex structures having, at least locally, composite portions formed by the introduction of one of at least two materials of different compositions inside the other, the apparatus including a mould having fixed and movable portions, at least two separate systems for supplying materials to be injected into the said mould, and at least two distribution valves for these materials, one of the valves being of the multi-way type so as to cause a common discharge channel for material into the mould to communicate with either or both of the separate material-supply systems.</p> |
