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US 4,271,106 AGranted
Method for controlling an exothermic molding process
AssigneeControl Process, Incorporated
InventorRodney J. Groleau
Life of this patent
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Abstract
A control system for controlling a molding machine used for exothermic curing senses the rate of change of the temperature of the material in the mold. When the rate of change of temperature has first exceeded and then fallen below a predetermined reference level, it is determined that the exothermic curing reaction has been completed, and the mold is opened after a predetermined delay.
Claims5
A method of controlling the opening of a molding machine at the end of a curing cycle comprising the steps of:
- a. charging a mold with a resin that cures exothermically;
- b. sensing the temperature of the resin in the mold;
- c. detecting when the rate of change of the sensed temperature exceeds a first reference rate;
- d. after the first reference rate has been exceeded, detecting when the rate of change of the sensed temperature falls below a second reference rate that is at least as high as the lowest to which the rate of change of temperature falls after the resin in the mold has cured;
- and
- e. opening the mold at a time determined by the time at which the rate of change of temperature falls below the second reference rate.
3 more elements
Dependencies are inferred from the claim text.