Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1976-02-02
1977-12-27
White, Robert F.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
264254, 264273, 264275, B29D 300
Patent
active
040655393
ABSTRACT:
A method of molding plastic containers of the type having enclosure portions which are adapted to be hingedly connected to one another. One embodiment of the invention involves a method for making a mirror-containing, cosmetic compact, comprising the steps of placing a mirror component face down on a mirror support of one of two cavity-defining molding dies, holding the mirror component against the mirror support, bringing both dies together, and injection molten plastic into the die cavities to cause it to back up and also surround the peripheral edge portions of the mirror so as to form one half of the compact. The method further includes, either at a later time or else simultaneously, the additional step of placing a hinge part in a recess of one of the mold cavities adjacent the mirror, and causing molten plastic to flow around a portion of the hinge part whereby the latter will be held captive in the plastic in predetermined relation to the mirror and the molded compact half. The molding dies are then separated and the molded compact half containing the hinge and mirror removed and transferred to a second set of dies, where molding of the cooperable casing half is effected around another portion of the hinge. Another embodiment of the invention more generally embraces the molding of a plastic container having an enclosure portion and a hinge carried by the enclosure portion, wherein the improvement comprises the step of molding the plastic of the enclosure portion around a part of the hinge to rigidly secure the latter to the enclosure portion in embedded relation.
REFERENCES:
patent: 1755292 (1930-04-01), Gagnon
patent: 3214504 (1965-10-01), Gemberling
patent: 3263008 (1966-07-01), Bender
Hall James R.
Lehmann H. Gibner
Lehmann K. Gibner
White Robert F.
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