Extrusion process for a stiff but bendable elongated plastic art

Details Extrusion process for a stiff but bendable elongated plastic art Extrusion process for a stiff but bendable elongated plastic art

1986-11-10

1988-06-07

Leppink, James A.

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

264545, B29C 4788

Patent

active

047495383

ABSTRACT:
The present application is concerned with an extrusion process for an elongated stiff but bendable plastic article which finds particular utility in highway delineators. The article has a central lens shape in the cross-section perpendicular to its major axis which is formed by joining two sheets along both of their longitudinal edges. The sheets both have parallel longitudinal edges and are configured in an arc in their shorter dimension. A reverse radius is provided in each longitudinal edge just before it joins the similar edge of the other sheet to allow the article to be bent 90.degree. across its major axis in the plane of its minor axis without significant plastic deformation. The article is constructed by pressing the cooled edges of thermoplastic sheets that can sustain substantial elastic deformation.

REFERENCES:
patent: 3048891 (1962-08-01), Maass
patent: 3295556 (1967-01-01), Gertsma et al.
patent: 3709967 (1973-01-01), Held, Jr.
patent: 3833700 (1974-09-01), Adomaitis
patent: 3933967 (1976-01-01), Taylor
patent: 4452752 (1984-06-01), Harder et al.

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