Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling heat transfer with molding material
Patent
1994-02-25
1995-06-27
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, B29C 4573
Patent
active
054277205
ABSTRACT:
The invention relates to a method of controlling the temperature of an injection mold, in particular for plastics and aluminium diecasting. The molten material being pressure-fed into the mold recess or the mold recesses of an injection mold by means of an extruder or the like in recurring cycles, cured therein, removed from the mold, and pressure-melted material being again supplied with the start of another cycle. A plurality of flow control valves are controlled by a sensor to provide an impulse or intermittent flow of the temperature control medium during each molding cycle at the same point in time as the previous cycle. The sensor compares a calculated temperature for a determined point in time of a molding cycle with the actual temperature of the molding cycle for that point in time and triggers the flow of temperature control medium for a set period of time to adjust the temperature of the molding cycle. This provides a more exact method of injection molding.
REFERENCES:
patent: 3763293 (1973-10-01), Nussbaum
patent: 4354812 (1982-10-01), Wieder et al.
patent: 4420446 (1983-12-01), Wieder et al.
patent: 4586690 (1986-05-01), Hartel et al.
patent: 4690789 (1987-09-01), Ritchie et al.
patent: 4902454 (1990-02-01), Steinbichler
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