Process for embossing a relief pattern into a thermoplastic info

Details Process for embossing a relief pattern into a thermoplastic info Process for embossing a relief pattern into a thermoplastic info

1978-10-03

1980-09-16

Lowe, James B.

Coating processes

Optical element produced

Polarizer, windshield, optical fiber, projection screen, or...

264 1, 264 2, 264 25, 264293, 427162, 427276, B29C 1700, B29D 1100

Patent

active

042230500

ABSTRACT:
There is disclosed a method for embossing a relief pattern of high resolution into a thermoplastic information carrier by means of a heatable embossing matrix. The matrix, which exhibits the desired relief pattern, is pressed onto the thermoplastic information carrier, and is then heated by means of an electric current. After the electric current has ceased, the embossing pressure is maintained until the thermoplastic information carrier has hardened through cooling. Alternative methods permits selected variation of the relief pattern to be embossed by selectively altering the surface of the support member which supports the information carrier during the embossing operation or by selectively heating the embossing matrix.

REFERENCES:
patent: 2541214 (1951-02-01), Davis
patent: 3497576 (1970-02-01), Dvorin
patent: 3882207 (1975-05-01), Hannan

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