Gas-assisted injection molding of hollow ribbed article

Details Gas-assisted injection molding of hollow ribbed article Gas-assisted injection molding of hollow ribbed article

1992-10-05

1995-03-28

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

With internal application of fluid pressure

2643288, 26432812, 26432813, B29C 4500, B29D 2200

Patent

active

054014590

ABSTRACT:
Improvements in articles, made by gas assisted injection molding of polyethylene and other materials, such as large arch shaped subsurface leaching conduits, and the processes by which they are made, are disclosed. The improvements involve control of which portions are hollow and which are solid, and include a stepped rib, where the thinner upper rib portion is solid and the wider base is hollow; articles having corrugated surfaces strengthened by ribs on both sides, where the hollows of the opposing side ribs are connected through holes in the undulating walls; articles having ribs which are narrowed where they are solid, compared to their width where they are hollow; and, articles having thinned wall regions surrounding sprues, to avoid undesired hollowing during injection molding.

REFERENCES:
patent: 4101617 (1978-07-01), Friedrich
patent: 4136220 (1979-01-01), Olabisi
patent: 4234642 (1980-11-01), Olabisi
patent: 4247515 (1981-01-01), Olabisi
patent: 5054689 (1991-10-01), Hunerberg et al.
patent: 5135703 (1992-08-01), Hunerberg et al.
Rusch, K. C. "Gas-Assisted Injection Molding--The New Thermoplastic Molding Technology for Exterior Body Panels". Paper Presented at a Meeting of the Society of Automotive Engineers, Mar. 2, 1989 (pp. 1-8).
Detroit Plastic Molding "Gas Assisted Injection Molding" Brochure 6 pages (unknown date).

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