Importance

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Abstract

A double-walled plastic box (20) is molded from a single parison (50) in an unlimited depth by closing the bottom of parison (50) and draping it downwardly over a core (60) so that a leading part of the parison forms an inside wall of the box and a following part of the parison forms an outside wall of the box. After parison (50) is draped over core (60), outer mold parts (61) close around the core and the draped parison; and the box is blown in a cavity between the core and the outer mold parts. The parison can be ballooned while draping down over the core to enlarge the parison to stand out from and surround the core, which can be raised during the draping process. Parison (50) can also be deballooned after draping to stay within the confines of outer mold parts (61) while core (60) raises and while the outer mold parts close.

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First Claim