Plastic and nonmetallic article shaping or treating: processes – Treating shaped or solid article – By a temperature change
Patent
1989-11-28
1991-12-31
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Treating shaped or solid article
By a temperature change
430 50, B29C 7102, G03G 1600
Patent
active
050769901
ABSTRACT:
A method for recording and erasing a visible image on a card having a recording area with a smooth surface of a synthetic resin, which includes a step of subjecting the smooth surface in the recording area to frosting treatment at a temperature within a range of from the glass transition temperature to the melting point of the synthetic resin, to form a frosted surface having a strain, and step of defrosting the frosted surface by heating it at a temperature higher than the temperature for the frosting treatment, to return it to a smooth surface, whereby a visible image is formed in the recording area by the contrast between the frosted surface and the smooth surface.
REFERENCES:
patent: 3118785 (1964-01-01), Anderson et al.
patent: 3131019 (1964-04-01), D'Antonio
patent: 3196008 (1965-07-01), Mihajlov et al.
patent: 3196011 (1965-07-01), Gunther et al.
patent: 3982936 (1976-09-01), Goffe
IBM Technical Disclosure Bulletin, vol. 8, No. 11, Apr. 11, 1966, p. 14.
Abstract of Japan 63-47,733 (published Feb. 29, 1988).
Abstract of Japan 2-103,196 (published Apr. 16, 1990).
Mitsubishi Plastics Industries Limited
Tentoni Leo B.
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