Apparatus for the injection moulding of unsaturated polyester re

Details Apparatus for the injection moulding of unsaturated polyester re Apparatus for the injection moulding of unsaturated polyester re

1990-03-30

1991-09-03

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Means applying electrical or wave energy directly to work

Electro-static or inductive field

264 26, 4251748E, 425547, 425557, 425543, B29C 3512, B29C 4572

Patent

active

050449150

ABSTRACT:
A method for the injection moulding of unsaturated polyester resin masses includes the steps of compacting the moulding mass in an accumulation cylinder, generating a subatmospheric pressure in the cylinder and heating the compacted mass at subatmospheric pressure by the application of a high-frequency load as it passes between the inner wall of a hollow metal cylinder and a coaxial spaced cylindrical electrode and injecting the material into the die. The apparatus for carrying out the method includes an accumulation cylinder of metal having a coaxial cylindrical electrode mounted therein to define a substantially hollow cylindrical passage for the flow of the resin mass. A generator is connected to the electrode to generate high frequency waves to heat the resin mass passing over the electrode.

REFERENCES:
patent: 2370883 (1945-03-01), Smith
patent: 2386966 (1945-10-01), MacMillin
patent: 2436999 (1948-03-01), MacMillin et al.
patent: 2443594 (1948-06-01), Boettler et al.
patent: 2448676 (1948-09-01), MacMillin et al.
patent: 2505602 (1950-04-01), Bertrand
patent: 2608637 (1952-08-01), Dakin et al.
patent: 4678421 (1987-07-01), Kai et al.

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