Plastic article or earthenware shaping or treating: apparatus – Diverse distinct type shaping means – Shaping orifice and either a downstream preform reshaping...
Patent
1980-06-30
1982-04-06
Silbaugh, Jan H.
Plastic article or earthenware shaping or treating: apparatus
Diverse distinct type shaping means
Shaping orifice and either a downstream preform reshaping...
425526, 425532, 4253261, 425327, B29D 2304, B29C 300, B29C 1707
Patent
active
043233406
ABSTRACT:
Disclosed are apparatus and 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: 3288898 (1966-11-01), West
patent: 3433862 (1969-03-01), Weber
patent: 3733309 (1973-05-01), Wyeth et al.
Click Myron E.
Lynch Charles S.
Owens--Illinois, Inc.
Silbaugh Jan H.
Wilson David H.
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