Injection molding machine having a uniformly compressible platen and process for preventing flash formation

摘要

An injection molding machine includes a stationary platen having a first mold half, at least one movable platen having a second mold half for forming a mold with the first mold half, tie bars for guiding the movable platen relative the stationary platen, and an injection unit for injecting molten resin into the mold. For at least one of the stationary and movable platen, a force is generated during clamping having a first direction. The at least one stationary and movable platens includes a first wall having edges and a central area and at least first and second sides, wherein the first side is adapted to be positioned nearest the clamping operation. The platen further includes a second wall spaced from and substantially parallel to the first wall, wherein the first and second walls extend substantially transverse to the first direction of the force. An intermediate support structure is positioned between the walls and is used to direct the force from the edges of the first wall toward the central area of the first wall for substantially preventing non-uniform deflection of the first wall along the first side. A related process for preventing flash formation is also disclosed.