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
1992-05-29
1992-12-29
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
2643287, 26432816, 425577, B29C 4536
Patent
active
051749416
ABSTRACT:
The dimensions of a plastic product are controlled while injection molding the product in a mold cavity of a mold comprising a core section and a cavity section, separated by a parting line and defining the mold cavity. In one method the mold cavity wall thicknes is controlled during an injection of a first quantity of plastic material by locking the core section to impede lateral movement thereof by means of contact between a non-perpendicular contact surface of a protracted contact element of one mold section and an associated non-perpendicular contact surface of the other mold section, and is further controlled during an injection of a second quantity of plastic material, which occurs a predetermined period after discontinuing the flow of plastic material into the mold cavity and after the contact element has been retracted, by locking the core section to impede lateral movement thereof by means of a at-least-partly-solidified wall sections having a controlled thickness formed during the injection of the first quantity of plastic material. In another method, the mold cavity wall thickness is controlled during an injection of a first quantity of plastic material, which does not completely cover the parting line of the mold, by locking the core section to impede lateral movement thereof by means of contact between a non-perpendicular contact surface of a protracted contact element of one mold section and an associated non-perpendicular contact surface of the other mold section, and is further controlled during an injection of a second quantity of plastic material, which occurs after the contact element has been retracted, by locking the core section to impede lateral movement thereof by means of at-least-partly-solidified wall sections having a controlled thickness formed during the injection of the first quantity of plastic material.
REFERENCES:
patent: 3305892 (1967-02-01), Heider
patent: 3737272 (1973-06-01), Segmuller
patent: 4339408 (1982-07-01), Jenkins
patent: 4508676 (1985-04-01), Sorensen
patent: 4733801 (1988-03-01), Scammell
Callan Edward W.
Heitbrink Jill L.
Primtec
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