Method for forming an optical design pattern in polyethylene ter

Details Method for forming an optical design pattern in polyethylene ter Method for forming an optical design pattern in polyethylene ter

1979-11-16

1981-12-22

Silbaugh, Jan H.

Stock material or miscellaneous articles

Hollow or container type article

Cellular material derived from plant or animal source

264513, 264516, 264246, 264247, 264250, 264274, 428161, 428163, 428480, 428910, B32B 300, B29C 900, B29C 1707, B29F 110

Patent

active

043071376

ABSTRACT:
Formation of an optical design pattern in an article of polyethylene terephthalate by utilizing the property of polyethylene terephthalate to become crystallized and whitened upon slow cooling and the fact that cooling of a plastic article molded within a mold advances from the surface portion of the article in contact with the surface of the mold toward the wall of the article. Based on this theory, a desired portion of the wall of an article of polyethylene terephthalate is whitened by properly controlling the degree and speed of cooling of the polyethylene terephthalate article in the mold to cool it slowly. The whitened portion in the wall is developed as an optical design pattern that can be viewed from outside. The whitened optical design pattern developed by the aforesaid technique can be made more distinct by heat treatment and stretching treatment.

REFERENCES:
patent: 2160108 (1939-05-01), Reid
patent: 2663910 (1953-12-01), Danielson et al.
patent: 3284259 (1966-11-01), Galloway et al.
patent: 3733309 (1973-05-01), Wyeth et al.
patent: 3821349 (1974-06-01), Mozer
patent: 4107362 (1978-08-01), Valyi
patent: 4127693 (1978-11-01), Lemelson
patent: 4198457 (1980-04-01), Saito et al.

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