Plastics injection molding device with multipositioning construction for gas assisted molding

摘要

Gas transmission plugs are placed in a supporting strip portion in plastics injection mold tooling so that an appropriate gas assist injection location can be readily selected, and mated, with a gas injection nozzle thereby eliminating the requirement for pre-drilling mold tooling with gas injection points and removing the tooling from the press so that a gas injection nozzle can be installed relative to the selected injection location. The plugs can be made from porous metal or ceramic with pores that are so small that plastics cannot enter the plug to cause pore clogging. Also, linear gas transmitting passages can be laser beam drilled through plugs of steel or other material with diameters that are sufficiently minute to prevent entry of plastics melt and resultant clogging.