Back-to-back valve gate system

Plastic article or earthenware shaping or treating: apparatus – Preform assembly means and means for bonding of plural... – Reshaping means utilizing fluid pressure directly contacting...


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26132815, 425566, 425570, B29C 4523




A manifold is disposed within a pair of abutting pre-load mold plates in a pre-load relationship. Fluid flowing through the manifold is heated by a first heater. The fluid is then divided into a plurality of passages in the manifold. Pairs of passages have a back-to-back in-line relationship. A cylinder between each pair of the in-line passages holds a pair of pistons in the in-line relationship. Each piston in the pair has piston units in an interdigitated relationship with piston units on the other piston in the pair. Each pair of pistons is movable by pressurized fluid (e.g. air) between first and second positions. In the first position, each piston provides for the fluid (e.g. resin melt) flow through one of the passages to a pair of runners in the manifold. In the second position, each piston prevents the resin melt flow through the passages. A first heater heats the resin melt flowing through the passages. A second heater heats the resin melt flowing through the runners. Resin melt is prevented from leaking between the manifold and the mold plates even with temperature changes in the manifold as a result of the heating of the resin melt. This is accomplished by a pair of tongues, one rigid and the other resilient, extending from the manifold to the mold plate. In this way, fluid flowing into the manifold through one inlet exits through a plurality (e.g. 8) of gates without leakage after being heated at the passages and at the runners.

patent: 4043726 (1977-08-01), Tsunemoto et al.
patent: 4588367 (1986-05-01), Schad
patent: 5013235 (1991-05-01), Friderich
PE Plast Europe, No. 1, Mar. 1992, Munich DE, pp. 58-60, Hubrich & Nachtsheim "Stack Moulds Save Costs".


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