Apparatus for making a twin-wall, internally corrugated plastic

Details Apparatus for making a twin-wall, internally corrugated plastic Apparatus for making a twin-wall, internally corrugated plastic

1984-09-26

1985-11-26

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

With mechanical means forming or expanding pores

425817R, 425405R, 425127, 264DIG83, 264 451, B29C 1704

Patent

active

045552258

ABSTRACT:
A method and apparatus for making a twin-wall internally corrugated plastic structural part provided with a smooth, dense, solid, thin walled, non-cellular skin comprising injecting a thermoplastic or resin material into a pair of closed mold members which define a sealed cavity. A small amount of plastic material is initially injected into the cavity with the material impinging upon and being dispersed over the mold members thereby forming a generally continuous thin skin substantially the mold surfaces. Thereafter, successively and intermittently injecting an inert gas under pressure through one mold member during continued injection of the plastic material into the cavity thereby pressurizing the skin against the walls of the mold cavity and progressively commingling the inert gas under pressure and the inwardly flowing plastic material as both enter the cavity until the cavity is filled with an internal corrugated body integral with and bonded to the skin. Further steps include cooling the twin-wall internally corrugated structural part to permit the same to solidify as an integral unit and venting the mold cavity to atmosphere to relieve pressure from the corrugated plastic structural part. The intermittent injection of the inert gas introduces minute amounts of pressurized gas into the continuously injected plastic material.

REFERENCES:
patent: 2834045 (1958-05-01), Davies
patent: 4101617 (1978-07-01), Friederich
patent: 4136220 (1979-01-01), Olabisi
patent: 4140672 (1979-02-01), Kataoka
patent: 4201742 (1980-05-01), Hendry
patent: 4247515 (1981-01-01), Olabisi
Article Entitled, "Structural-Web Molding", Plastics Engineering, Oct. 1983, pp. 25-28.

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