Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling heat transfer with molding material
Patent
1995-10-12
1998-06-30
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling heat transfer with molding material
26432815, 26432816, 425144, 425548, 425549, 425552, B29C 4575
Patent
active
057729336
ABSTRACT:
A method for tempering an injection mold wherein in a recurrent cycle, the molten material is introduced under pressure into the mold recess of the injection mold, hardened and removed from the mold. Coolant or heating medium is supplied as a function of the deviation of the measured actual temperature from the desired command temperature. A plurality of flow control valves for the coolant or heating medium are preferably controlled via a measuring sensor. The three-dimensional quantitative distribution of coolant as needed is ascertained empirically or by computer with respect to the particular mold and the runners provided in the mold for the coolant or heating medium, and at least one specific time in the cycle period a comparison is made between the command temperature and the actual temperature of the one measuring sensor. The plurality of flow control valves are triggered as a function of the ascertained temperature deviation and as a function of the three-dimensional quantitative distribution profile, is distinguished in that a separate controller, each with a separate processor, is provided for cooling and heating, respectively. The amounts of heat to be supplied to the various regions of the mold in the next injection cycle at any time, resulting from heating and from the thermal quantity of the melt, is transmitted beforehand to the controller of the cooling runners, and the coolant quantities are controlled as a function of these heat amounts, transmitted beforehand, for the next cycle that follows.
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