Plastic article or earthenware shaping or treating: apparatus – Dough divider type including trap chamber – Rotating trap chamber pickup
Patent
1973-06-25
1976-06-15
Husar, Francis S.
Plastic article or earthenware shaping or treating: apparatus
Dough divider type including trap chamber
Rotating trap chamber pickup
425387B, 425DIG208, 425DIG209, B29D 2303
Patent
active
039633993
ABSTRACT:
Method and apparatus for molding plastic articles by forming a parison on a core within an injection mold, cooling the internal and external walls of the parison thus formed by heat transfer through the core and the injection mold, transferring said core to a delay position for permitting redistribution of heat from the interior of the parison to the exposed walls to obtain a more uniform temperature just above the material's glass transition temperature, and subsequently transferring said core to an expansion mold for expanding same, the cooling and heat redistribution permitting a greater degree of orientation of the polymer chains of the formed articles. Preferably, the apparatus for practicing the process includes injection and expansion molds supported in such a relation as to permit a substantial time interval between injection and expansion of the parison.
REFERENCES:
patent: 2331687 (1943-10-01), Hobson
patent: 3191225 (1965-06-01), Polka
patent: 3364520 (1968-01-01), Hestehave
patent: 3412186 (1968-11-01), Piotrowski
patent: 3433862 (1969-03-01), Weber
patent: 3584337 (1971-06-01), Aoki
patent: 3609803 (1971-10-01), Fattori
patent: 3667887 (1972-06-01), Reiss
patent: 3690802 (1972-09-01), Fischer
patent: 3694124 (1972-09-01), Saumsiegle
patent: 3707591 (1972-12-01), Chalfant
patent: 3740180 (1973-06-01), Sidur
patent: 3878282 (1975-04-01), Bonis et al.
Continental Can Company Inc.
Dittman William A.
Husar Francis S.
Kerwin Joseph E.
Rowold Carl
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