REVERSE FLOW PREVENTING APPARATUS OF INJECTION COMPRESSION MOLDING MACHINE

摘要

PURPOSE:To make it possible to perform molding generating no sink mark and imparting good surface accuracy without generating a minute resin stay part, by making a nozzle separable from the opening of a runner while closing the opening of the runner by a partition plate provided to an outer wall surface to which the runner is opened. CONSTITUTION:A partition plate 26 is contacted with an outer wall surface 13B, to which the runner 13 of a fixed mold 12 is opened, in a slidable manner and advances and retracts in the direction at right angles to the axis of the runner 13 to make the opening 13A of the runner 13 closable. When the fixed mold 12 and a movable mold 17 are present at a predetermined closing position, the partition plate 26 stands by in the direction at right angles to the axis of the runner 13 from the opening 13A of the runner 13 and a nozzle 24 is contacted with the opening 13A. When the mold cavity 21 is filled with a resin, the nozzle 24 is spaced apart from the opening 13A and, thereafter, the partition plate 26 is allowed to advance to perfectly close the opening 13A. As mentioned above, the opening 13A of the runner 13 can be closed by the partition plate 26 and the structure is simplified and the durability of the apparatus can be enhanced.