| 摘要 |
<p>A manifold (15,16) is disposed within a pair of abutting pre-load mold plates (12) in a pre-load relationship. Fluid flowing through the manifold is heated by a first heater (24). The fluid is then divided into a plurality of passages (20a,20b,20c,20d,22a,22b) in the manifold. Pairs of passages have a back-to-back in-line relationship. A cylinder (38) between each pair of the in-line passages holds a pair of pistons (40a,40b) in the in-line relationship. Each piston (40a) in the pair has piston units (42a,4b) in an interdigitated relationship with piston units (42c,42d) on the other piston (40b) 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 (24) heats the resin melt flowing through the passages. A second heater (26) 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 (70,72), 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. <IMAGE></p> |
