MANUFACTURING METHOD OF FOAMED MOLDED ARTICLE

摘要

PROBLEM TO BE SOLVED: To provide a method of manufacturing a sheet pad which is capable of preventing the foaming material from flowing out through the vent hole and yet efficiently and completely discharging foaming gas and air in the cavity to eliminate the occurrence of molding defects such as collapses and underfills and is easy to handle.

SOLUTION: The method of manufacturing foamed molded articles comprises injecting a foaming material in the cavity 22 of a foam molding die 10 having a vent hole 24 and expanding the foaming material. A degassing sheet 28 is obtained by attaching a non-permeable film 28b onto a plate-like permeable member 28a. The degassing sheet 28 is detachably attached to the inside of the cavity 22 with the non-permeable film 28b facing the foaming material by piercing the permeable member 28a and the non-permeable film 28b with a fixing pin 30 installed on the foam molding die 10 to cover the vent hole 24. The foaming material as it is foamed to fill the cavity 22 during the foam molding operation presses the permeable member 28a against the mold surface and to make the non-permeable film 28b block the vent hole 24 with the permeable member 28a in between.

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