Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1971-11-29
1976-12-14
Hoag, Willard E.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
264318, 264331, 264334, B29C 504
Patent
active
039976491
ABSTRACT:
Method for molding a hollow plastic article using a mold having an axis of rotation which is disposed during one phase of the molding operation in horizontal attitude. The mold has an opening symmetrically disposed about this axis, which opening is of a size to enable the removal of the molded article from the mold when molding is completed. A charge-retaining member is provided in association with the mold adjacent the aforesaid opening, this member being perpendicular to the aforesaid axis and defining an opening symmetrically disposed about this axis and of a size to permit the insertion of a plastic charge into the mold during its rotation. The aforesaid member can be integral with the mold or can be part of a removable cover. An elongated burner is provided extending along the mold parallel to the horizontal axis, the burner having an extent such that it does not extend beyond the charge-retaining member. Blowers are provided for blowing cooling air onto the mold and through the aforesaid openings when molding has been completed. Insofar as the associated method is concerned, the aforesaid mold can be preheated and a plastic charge inserted into the mold after this preheating, the charge being fused and thereafter cooled, the article which is formed being removed from the mold via the opening therein or via the opening in the charge-retaining member. The plastic charge is heated generally exclusively by heat passing through the mold, this heat being generally prevented from passing through either of the aforesaid openings.
REFERENCES:
patent: 1146385 (1915-07-01), Aylsworth
patent: 2826869 (1958-03-01), Lerch
patent: 2862806 (1958-12-01), Nestor
patent: 3217078 (1965-11-01), Kleiber
patent: 3301925 (1967-01-01), Engel
patent: 3337662 (1967-08-01), Spencer
patent: 3455483 (1969-07-01), Inklaar
patent: 3507950 (1970-04-01), Barnett et al.
patent: 3514508 (1970-05-01), Shott et al.
Hoag Willard E.
Rototron Corporation
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