Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Forming plural articles
Patent
1995-07-12
1997-09-02
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Forming plural articles
2642978, 2643287, 2643288, 26432812, B29C 4512
Patent
active
056628560
ABSTRACT:
Hollow plastic articles are produced by a method wherein molten material is first conveyed at low pressure via a telescoping nozzle, across compensating rods in the melt passages and individually circumferential flow passages of common primary distribution spools into transfer reservoirs. Upon completion of the controlled filling phase, primary and secondary distribution spools are shifted, the mold manifold assembly with the transfer housing together with the mold cavity bottoms and outside wall-forming sleeves are drawn in unison against stationary displacement plugs which transfer the molten material from the transfer reservoirs around the fixed-position core pin tips and into corresponding mold cavities. After completion of the cavity filling phase, the common secondary distribution spools, located close to the mold cavity bottom gates, are shifted laterally such that their land areas shut off the external melt streams. The manifold assembly, together with the now sealed cavity bottoms and outside wall-forming sleeves, move toward the fixed position core pins, whereby the molten material flowing in the same direction is condensed into the final shape of the hollow plastic article. Upon solidification, the mold is opened and the molded hollow articles are rotated or shuttled on the cooling core pins in a vertical or horizontal plane outside the molding machine clamp to subsequent cooling and ejection stations. During the hollow plastic article condensing phase, the primary distribution spools are shifted laterally again to open the passages from the plasticizer to refill simultaneously the individual transfer reservoirs with molten material.
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Fink Edward M.
Imesco, Inc.
Tentoni Leo B.
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