Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Including both heating and cooling means
Patent
1995-06-07
1997-06-24
Nguyen, Khanh P.
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Including both heating and cooling means
4253871, 425388, 264 403, 264549, 264550, B29C 5106, B29C 5110
Patent
active
056415249
ABSTRACT:
An apparatus for plug-assisted thermoforming of a cup or other hollow article has a concave well or cone region machined into its top with a series of small holes drilled near the deepest part of the well and connected to a port inside the plug which is connected to a specifically sized manifold system. The manifold has a source for positive (pneumatic) and negative (vacuum) pressure air. During the machine cycle, a vacuum is introduced into the plug, which draws the hot plastic sheet into the plug well to stretch it. The vacuum is replaced by compressed air to transfer the pre-stretched sheet into a mold. In a particularly preferred embodiment, the plug is shaped to provide stretching in both the central well and in peripheral regions concentric with the well. Controlled air pressure in the mold may be used to provide the concentric prestretching.
REFERENCES:
patent: 2973558 (1961-03-01), Stratton, Jr.
patent: 2990581 (1961-07-01), Rowe, Jr.
patent: 3218379 (1965-11-01), Edwards
patent: 3338997 (1967-08-01), Tigner
patent: 3342914 (1967-09-01), Edwards
patent: 3441983 (1969-05-01), Cheney
patent: 3749542 (1973-07-01), Shelby
patent: 3814784 (1974-06-01), Wolf
patent: 4382767 (1983-05-01), Naugle et al.
patent: 4443401 (1984-04-01), Turner
patent: 4500277 (1985-02-01), Bullock et al.
patent: 4536148 (1985-08-01), Murley et al.
patent: 4595554 (1986-06-01), Bullock et al.
patent: 4636349 (1987-01-01), MacLaughlin
patent: 4668175 (1987-05-01), Martin
patent: 4878826 (1989-11-01), Wendt
Johnson John R.
Rush Jonathan E.
James River Corporation of Virginia
Leedom Jr. Charles M.
Nguyen Khanh P.
Studebaker Donald R.
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