METHOD FOR MOLDING HOLLOW RESIN PRODUCT

摘要

PURPOSE:To provide a method for molding a hollow resin product of good introduction properties for a fluid making a hollow and forming a desired hollow section surely without using a separate device or the like. CONSTITUTION:A cavity 13 having the shape of increasing the thickness T1-T2 as being separated from a sprue 14 further is used, and molten resin 20 is filled in a cavity 13, and pressurized gas 23 is injected into the cavity 13 after or at the same time of filling to grow a hollow section 22 to be formed even in all the corners.