| 摘要 |
A multi-plate injection molding tool has multiple cavities. It includes a hot-runner plate, a hot-runner distribution block adjacent to the hot-runner plate, and a plurality of hot-runner nozzles. The hot-runner distribution block is a monolithic seamless metal block. A lower die plate is removably attached to the hot-runner plate, and an upper die bolster is adjustably attached to the lower die plate and is movable along fixed guide columns. The upper die bolster comprises a base plate, a stripping plate and a slide plate. A plurality of form cores are supported on the upper die bolster, and a plurality of annular stamps are attached to the lower die plate, each being around a form core and each having a conical exterior surface tapered towards the lower die plate, and cooperating with a die; a plurality of dies is carried by the lower die plate, and each has a mating conical surface for receiving the conical surface of a stamp in close fit therewith when the molding tool is closed. The hot-runner distribution block has at least two channels for receiving two different material components from injectors, the channels comprising main channels and branch channels of equal length between their inlets and outlets, and there is a temperature stabilizing construction in the hot-runner distribution block and the hot-runner nozzles. A fluid operated valve is provided for selectively releasing to a nozzle, or for blocking, the different material components.
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