Title: Blow molding device having a blow mandrel with a seal forming ring

Abstract: A blow mandrel for the production of hollow bodies in a hollow blow mold, particular for the production of filled bottles sealed ready for shipment, from a length of tubing of a thermoplastic resin, having an axially displaceable blow pipe adapted to be surrounded by an edge of the mold opening. The blow mandrel comprises the aforementioned blow pipe and, at its mouth section, a sealing ring protruding outwardly beyond the circumferential surface of the blow pipe and extending in closed form in the circumferential direction of the pipe upon blowing in the region of the edge of the opening of the blow mold. The sealing ring has, on its side turned toward the mold cavity, an annular groove open in the direction of the blow-mold cavity.

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Inventors: Thiele, Hans Dietrich (Baden, DT)

Application Number: 468414
Filing Date: 1974-05-09
Publication_date: 1976-03-02
Assignee: PMD Entwicklungswerk fur Kunststoff-Maschinen GmbH & Co. KG (Ettlingen, Baden, DT)
Primary Class(es): 425/292 425/531
Other Classes:
US Patent Ref:

3209401	Oct, 1965	Mehnert	425/387.
3224038	Dec, 1965	Budesheim	425/DIG.
3585683	Jun, 1971	Wilson	425/387.
3819317	Jun, 1974	Higginbotham	425/387.
3827214	Aug, 1974	Naumann	425/387.

Other Refs:
Primary Examiner: Shore, Ronald J.
Assistant Examiner: Safran, David S.
Attorney: Montague; Ernest G., Ross; Karl F., Dubno; Herbert