Importance

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Abstract

A method of molding hollow bodies by continuously downwardly extruding a melt of synthetic resin from a die to form a tubular parison, closing and sealing the free end of the parison, holding the parison, cutting the parison thereby forming a cut-off tube with a closed sealed end and blowing a fluid into the cut-off tube retained in the mold thereby forming a hollow body. Certain apparatus modifications are disclosed such that the step of closing and sealing comprises moving sealing members from outside the parison towards its center, bringing the sealing members into contact with each other while filling the resin of the free end into a space provided between the end of a mandrel extension and the sealing members. The holding step consists of holding a portion of the moving parison which becomes the cut-off tube by its outside surface. The method further comprises during the steps of cutting and sealing, moving the mechanism for forming the bottom, the mechanism for cutting, the mechanism for holding the cut-off tube, and the mandrel extension at substantially the same speed and in substantially the same direction as the movement of the parison extruded from the die.

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First Claim