Method and apparatus for injection molding data carrying element

Details Method and apparatus for injection molding data carrying element Method and apparatus for injection molding data carrying element

1979-06-28

1981-02-17

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

Forming sound grooves in records

264 406, 26432816, 425810, B29D 1700

Patent

active

042514797

ABSTRACT:
A method and apparatus for injection molding styrene phonograph records and the like. Through use of special fixtures and the careful control of time, temperature and pressure during the molding process in accordance with the method of the invention, the height, width, angle and side wall configuration of the groove of monophonic, sterophonic or quadraphonic record masters can be precisely replicated in the molded records, thereby enabling high volume production of injection molded styrene records of superior quality.

REFERENCES:
patent: 1520214 (1924-12-01), Thomson
patent: 1582704 (1926-04-01), Sylvester
patent: 2494974 (1950-01-01), Wadleigh
patent: 2681323 (1954-06-01), Groff
patent: 3619449 (1971-11-01), Berard
Injection Molding of Gramaphone Records, G. C. Portingell, British Plastics, Mar. 1962, vol. 35, No. 3, pp. 122-124.
Rotational Injection Molding-Part III: Isostatic Polystyrene, F. L. Saunders et al., SPE Journal, vol. 25, Sep. 1969, pp. 44-48.

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