Transfer molding process and an apparatus for the same

Details Transfer molding process and an apparatus for the same Transfer molding process and an apparatus for the same

1989-07-12

1990-09-04

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 407, 2643284, 425145, 425166, 425586, B29C 452, B29C 4576

Patent

active

049543016

ABSTRACT:
A transfer molding process and an apparatus for carrying out the same for sealing electronic devices, such as semiconductor devices, in a resin by driving a plunger downward in a pot to inject the resin into a mold. In injecting a resin into a mold by driving the plunger downward, the rotary motion of the output shaft of an electric motor is converted into a linear motion to drive the plunger downward, the downward displacement of the plunger from the initial position is detected, and pressure applied to the plunger is varied according to the displacement of the plunger. Thus, the transfer molding process and the apparatus for carrying out the same reduces defects, such as voids and incompletely filled parts, in the resin-sealed device, and prevents burrs and the deformation of the insert during the transfer molding operation.

REFERENCES:
patent: 3883047 (1975-05-01), Hofer et al.
patent: 4240996 (1980-12-01), Hunkar
patent: 4282176 (1981-08-01), Farrell
patent: 4301100 (1981-11-01), Farrell
patent: 4386898 (1983-06-01), Sera
patent: 4397806 (1983-08-01), Hettinga
patent: 4407649 (1983-10-01), Saito
patent: 4426341 (1984-01-01), Tsuzuku et al.
patent: 4708620 (1987-11-01), Brugger
patent: 4718840 (1988-01-01), Inaba et al.
patent: 4743190 (1988-05-01), Brunnschweiler et al.

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