Receptacles – Outlet or junction box type – Sectional receptacle
Patent
1975-05-27
1976-12-07
Ives, P. C.
Receptacles
Outlet or junction box type
Sectional receptacle
264 92, 428 35, 428500, 428516, 428519, 428521, 425388, 425398, 425118, 220 83, 220DIG12, 220DIG14, B65D 1102, B32B 104
Patent
active
039957632
ABSTRACT:
A scrap free process for rapidly making thermoplastic containers wherein the resultant containers can, if desired, be multilayered for vapor or gas barrier or other reasons, or be oriented for toughness and improved stress crack resistance. The containers can be formed from multilayered or homogeneous plastic sheets wherein a relatively thin thermoplastic blank is provided. This blank is lubricated, heated and forged into a desired shape preform with a predetermined lip configuration. The center portion of each said preform is maintained at a forming temperature while the peripheral portion thereof is rapidly brought below the softening point of the plastic resin. The preform is then immediately thermoformed into a container having a desired shape and size, and cooled. If desired, the preform can be forged, cooled and recovered from a subsequent thermoforming operation.
REFERENCES:
patent: 3186576 (1965-06-01), Whiteford
patent: 3619344 (1971-11-01), Wolinski
patent: 3684633 (1972-08-01), Haase
patent: 3826404 (1974-07-01), Rowe et al.
Ayres Ralph E.
Cleereman Kenneth J.
Schrenk Walter J.
Hessenaur, Jr. Lloyd E.
Ives P. C.
The Dow Chemical Company
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