FLUID ASSISTING TYPE INJECTION MOLDING METHOD AND SYSTEM FOR MANUFACTURING HOLLOW BODY

摘要

PURPOSE: To eject a fluid to a predetermined position of the molten resin flow in a mold at a downstream position from the resin opening part of the mold by ejecting a molten resin into the hollow part of the mold along a resin flow passage from an injection nozzle through an injection opening part in an amt. sufficient to produce a main body. CONSTITUTION: A plastic resin is injected into a mold 28 through the injection opening part formed in a sprue bush 36 and gas is injected into the mold 28 through a fluid opening part 118 by the control of a valve 26. A plastic product or part is pressed to the inner surface of the mold within a mold hollow part 66 by the gas until an article is cooled. The gas passes through the opening part formed within the plastic product to return through a gas passage 116 and the opening part 118 by the control of the valve 26. The mold 28 is opened to take out the plastic product.