Process of tempering plastic injection molding tools

Details Process of tempering plastic injection molding tools Process of tempering plastic injection molding tools

1988-08-10

1990-02-20

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Controlling heat transfer with molding material

26432816, 425144, 425548, 425552, B29C 4578

Patent

active

049024540

ABSTRACT:
A process for tempering tools, for use on the form tools of extrusion forming machines. In the injection molding tools there are conduction circuits for a coolant which are connected to ducts for the inflow and backflow of the coolant. Valves (4) control the throughflow of the coolant. There are temperature sensors (5, 6) in the ducts for the inflow and backflow of the coolant. The temperature sensors (5, 6) are connected to a computer (7) which controls the opening and closing times of the valves (4) as a function of a nominal difference fed in between the inflow and backflow temperatures of the coolant. Advantageously, a temperature sensor (3) which is also connected to the computer (7) is provided on the form tool.

REFERENCES:
patent: 4548773 (1985-10-01), Suh et al.
patent: 4608218 (1986-08-01), Rummler et al.
patent: 4798692 (1989-01-01), Blersch et al.
Plastics Engineering Handbook, 4th edition, 1976, pp. 143-145, 618 and 619.

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