| 摘要 |
PURPOSE:To average the thickness of molded products by a method wherein pressure air is supplied into a space formed between the inner surface of a female mold and the foamed sheet to put the sheet under pressurized condition when the heated and softened foamed sheet is pinched between molds and the molds are clamped. CONSTITUTION:A female mold 1 located at the upper position, is lowered after a male mold 2 is elevated to the position of a clamp frame 3. The female mold 1 is lowered to the position where the lower end thereof is abutted substantially against the foamed sheet S pushed up by the male mold 2 and pressure air is blown into the space H formed between the inner surface of the female mold 1 and the foamed sheet S through the ventilating hole 10 of the female mold 1 to pressurize the air in the space H. Thereafter, the female mold 1 is lowered further to abut it against the male mold 2 and mold clamping is effected perfectly. According to this method, a part of the foamed sheet S, which is opposed to the vicinity of tip end of the male mold 2, is pushed strongly against the male mold 2 and is cooled rapidly, therefore the thermal deformation of the sheet S may be restricted. |
