Reverse parison draping for blow molding

Details Reverse parison draping for blow molding Reverse parison draping for blow molding

1986-12-22

1988-09-13

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

264515, 264529, 264531, 264534, 264540, 425525, 425532, B29C 4918, B29C 4930, B29C 4904

Patent

active

047708395

ABSTRACT:
A double-walled plastic box 20 is molded from a single parison 50 in an unlimited depth by closing and holding a bottom region of the parison at the bottom of a cavity 30, bringing together parts of a core 40 above the cavity to close off an upper region of the parison, moving the core, the cavity, or both vertically to position the core within the cavity and invert the parison so that a lower region of the parison forms an outside wall of the box against an inside surface of the cavity and an upper region of the parison forms an inside wall of the box against an outer surface of the core. The parison is then blown into a double-walled box 20 in the shape of an enclosed space between the cavity and the core.

REFERENCES:
patent: 3334164 (1967-08-01), Samuels et al.
patent: 3372429 (1968-03-01), Kato
patent: 3452125 (1969-06-01), Schurman et al.
patent: 3636151 (1972-01-01), Nagai
patent: 3736201 (1973-05-01), Teraoka
patent: 3819789 (1974-06-01), Parker
patent: 3944643 (1976-03-01), Sato et al.
patent: 4029234 (1977-06-01), Johnson, Jr. et al.
patent: 4035461 (1977-07-01), Korth
patent: 4423000 (1983-12-01), Teraoka
patent: 4510116 (1985-04-01), Peters et al.

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