PURPOSE: To obtain a uniform blow-molded article or deep-draw double-structured article, by extruding dangling two stripes of sheetlike articles, whose thickness are different from each other, through a blow die or parison through a rond or profile die.
CONSTITUTION: Simultaneously with a matter that two stripes of parison, whose thicknesses are different from each other, begin to dangle directly below the tips of the same are molded into baglike materials by a shutter. The above material is supplied between X-X of a male 10 and female 11 of mold surfaces by preventing drawdown by a method wherein the baglike material is clamped extending over the whole length of its width and the baglike material is made to harmonize with a descending rate of the parison or microscopic slow.fast rate of the same. Simultaneously with clamping a clamping device E is made to secede from a mold to the outside of the same through backward movement of a rod (b) of a cylinder 7. Clamping is performed after preblow by keeping the inside of the parison at constant pressure. With this molding, it becomes possible to mold a deep-draw double-structured and normal blow article at the uniform thickness through the two stripes of the parison whoses thicknesses are different from each other.
FUKUMA TAKANORI
MAKI YASUNORI
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