Method for molding straight ribbed articles

Details Method for molding straight ribbed articles Method for molding straight ribbed articles

1980-11-03

1982-07-13

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

2643288, 26432812, 264334, 425555, B29F 114

Patent

active

043394086

ABSTRACT:
A method of molding a hollow, plastic article having ribs extending from its walls comprising the steps of positioning the mold cavity forming members in a closed position to define a mold cavity corresponding to the configuration of the article; injecting molten thermoplastic material into the cavity; allowing the material to cool for a predetermined period of time to permit partial cooling and setting of the plastic; injecting additional plastic material into the rib forming portion of the mold cavity at a plurality of injection points spaced along the rib portion; pausing for a second predetermined time to permit complete setting of the plastic in the mold; displacing the cavity defining members from their closed position and exerting an ejecting pressure on the rib portion at the plurality of injection points along its length to aid in ejecting the article from the mold.

REFERENCES:
patent: 3670066 (1972-06-01), Valyi
patent: 3822029 (1974-07-01), Butsch
patent: 3826553 (1974-07-01), Cushing
patent: 3905740 (1975-09-01), Lovejoy

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