Method for removing surplus plastic material from the neck porti

Details Method for removing surplus plastic material from the neck porti Method for removing surplus plastic material from the neck porti

1974-11-06

1976-11-02

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 99, 264161, 264334, 425DIG204, 425DIG212, 425DIG232, 425806, B29C 1707, B29C 1712

Patent

active

039897869

ABSTRACT:
Annular surplus material which is separated from a parison section in the cavity of a blow mold in response to penetration of a blowing mandrel into the neck mold of the blow mold in a blow molding apparatus is stripped off the mandrel during the last stage of movement of the mandrel to an upper end position and subsequent to complete opening of the blow mold so as to allow a freshly formed plastic container to descend by gravity and to move sideways out of alignment with the mandrel. The mandrel has a cylindrical calibrating portion which cooperates with the neck mold to press mold the neck portion of the container prior to blowing, and a smaller-diameter lower end portion which guides the container during the initial stage of gravitational descent onto a conveyor or into a receptacle. The annular surplus material extends into a circumferential groove of the mandrel above the calibrating portion and is integral with radially extending surplus material which penetrates into pockets between the sections of the neck mold in response to closing of the blow mold around a large-diameter parison section. The blow mold is partly opened prior to lifting of the calibrating portion out of the neck portion of the container whereby the volume of the pockets increases and the radially extending surplus is more likely to share the upward movement of annular surplus material.

REFERENCES:
patent: 2994103 (1961-08-01), Schaich
patent: 3487501 (1970-01-01), Siard et al.
patent: 3657406 (1972-04-01), Delebarre
patent: 3752628 (1973-08-01), Hafele et al.

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