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
1989-12-11
1991-09-03
Heitbrink, Jill L.
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
264255, 2643287, 2643288, 26432812, 425127, 4251291, 425130, B29C 4516
Patent
active
050452681
ABSTRACT:
A plastic product having a cross-laminated section including a first plastic layer and a second plastic layer is injection molded in a mold system that includes a first mold cavity with a first-layer-defining-mold-cavity-section and a second mold cavity with a second-layer-defining-mold-cavity-section that has a second-cavity-section-wall. The product is molded by injecting a quantity of first plastic into the first mold cavity so that first plastic flows from a flow channel into the first-layer-defining-mold-cavity-section in a first predetermined general direction that is different than the direction of the flow channel; solidifying at least partly the flowed first plastic in the first-layer-defining-mold-cavity-section to thereby form said first plastic layer having a first-direction-flow-record; adjusting the mold system to provide the second mold cavity, with the second-cavity-section-wall including the first plastic layer; injecting a quantity of second plastic into the second mold cavity so that second plastic flows from a flow channel into the second-layer-defining-mold-cavity-section in a second predetermined general direction that is different than the direction of the flow channel, whereby second plastic in the second-layer-defining-mold-cavity-section fuses with the first plastic layer; and solidifying the flowed second plastic in the second-layer-defining-mold-cavity-section to thereby form the second plastic layer, so that the second plastic layer has a second-direction-flow-record, which is positively different from the first-direction-flow-record, to thereby form the plastic product with the cross-laminated section that includes both the first plastic layer and the second plastic layer. The first plastic and the second plastic are injected through at least one shared gate.
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Callan Edward W.
Heitbrink Jill L.
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