Method of making plastic articles

Details Method of making plastic articles Method of making plastic articles

1980-06-30

1985-05-28

Silbaugh, Jan

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

2643093, 2642102, B29C 1707

Patent

active

045199760

ABSTRACT:
A method for forming multi-directionally oriented plastic articles by shearing a thermoplastic material in a non-linear shear pattern while the material is at a temperature conducive to orientation and further processing the material by known plastic forming techniques to form an article in which the material remains oriented. More specifically, thermoplastic material is plasticized and accumulated in an amount at least sufficient to form the article, and the material is expressed under pressure from the accumulated body to and through an orifice. The material is non-linearly sheared prior to its issuance from the orifice to induce orientation stresses into the material, and, during shearing, the material is at a temperature which is conducive to orientation. The orientation stresses are frozen into the material when the material is formed to a desired configuration exteriorly of the orifice by known plastic forming techniques, such as blow molding, injection molding, compression molding, thermoforming and the like. During such forming, additional orientation stresses may be induced in the material and superimposed upon those stresses previously introduced thereinto.

REFERENCES:
patent: 3256560 (1966-06-01), Adomaitis
patent: 3281897 (1966-11-01), Mercer
patent: 3288898 (1966-11-01), West
patent: 3404203 (1968-10-01), Donald
patent: 3433862 (1969-03-01), Weber
patent: 3733309 (1973-05-01), Wyeth et al.

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