Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Including application of internal fluid pressure to hollow...
Patent
1986-08-11
1990-04-24
Lowe, James
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Including application of internal fluid pressure to hollow...
264515, 264540, 425297, 425468, 425469, B29C 4918, B29C 4930, B29C 4904
Patent
active
049198807
ABSTRACT:
A pinch-off clamp 20, built into a top 12 of a hollow core 11 within a blow molding machine 10, has jaws 21 and 22 that open to receive a leading end 18 of a parison 15, which descends into the hollow core. Then jaws 21 and 22 close together to pinch off and hold a leading region of parison 15 at top of core 11. Once parison 15 is pinched off and held closed, it can be ballooned and draped over core 11 and then blown into a double-walled box formed between the core and cavity mold parts closed around the core.
REFERENCES:
patent: 3507942 (1970-04-01), Lynch
patent: 3579622 (1971-05-01), Shaw et al.
patent: 3806587 (1974-04-01), Turner
patent: 3861845 (1975-01-01), Butcher
patent: 3865531 (1975-02-01), Moore et al.
Lowe James
McCarthy Neil M.
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