Method for mold temperature control

Details Method for mold temperature control Method for mold temperature control

1982-03-15

1983-12-13

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Controlling heat transfer with molding material

B29C 2500

Patent

active

044204469

ABSTRACT:
A method and apparatus (10) is disclosed which provides automatic control of the temperature of a fluid cooled plastic mold (12) during successive injections of liquid plastic into the mold. The temperature of the mold (12) is sensed by a probe (18) which provides a signal indicative of the temperature of the mold. The signal from the probe (12) is compared by the apparatus with a selected control temperature signal indicative of the proper operating temperature of the mold. When the sensed temperature is above the control temperature, a solenoid operated control valve (50) is activated so that cooling fluid, such as ordinary tap water, is passed through cooling channels (13) in the mold. Flow of cooling fluid is shut off when the sensed temperature drops below the selected operating temperature. The apparatus (10) also includes an undertemperature signal light (54) which lights to inform the operator that the mold is below a minimum operating temperature; and an overtemperature alarm light (46) and a speaker (44) which are both activated to warn the operator when an unacceptable overtemperature in the mold is sensed.

REFERENCES:
patent: 3583467 (1971-06-01), Bennett

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