Manufacture of electroacoustic transducers which require molding

Details Manufacture of electroacoustic transducers which require molding Manufacture of electroacoustic transducers which require molding

1977-05-12

1978-12-05

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

Distinct means to feed, support or manipulate preform stock...

Female mold type means

425125, 425127, B29C 600

Patent

active

041283708

ABSTRACT:
This invention discloses a mold design which limits the maximum pressure that can be developed inside a closed cavity containing a polarized ceramic as a result of the volume expansion of the molding compound during the curing cycle. The pressure control is achieved by interposing a spring member between the mold and the pressure source which closes the mold. The spring will deflect slightly to absorb any volume expansion of the molding compound during the curing cycle, thus preventing any significant increase in pressure in the cavity and thereby preventing depolarization of the ceramic.

REFERENCES:
patent: 2377128 (1945-05-01), Burgess
patent: 2389178 (1945-11-01), Blount et al.
patent: 2440144 (1948-04-01), Hosking
patent: 2798255 (1957-07-01), Winters
patent: 2823419 (1958-02-01), Winters et al.
patent: 2963738 (1960-12-01), Brandes et al.
patent: 3709457 (1973-01-01), Church

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