Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling heat transfer with molding material
Patent
1988-04-12
1989-03-28
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling heat transfer with molding material
425140, 425160, 264 401, B29C 4576
Patent
active
048161977
ABSTRACT:
A method for controlling certain parameters of an injection molding cycle applying PVT optimization wherein the injection pressure and injection velocity of the melt are utilized to calculate an average viscosity for the melt during injection in a qualifying cycle of the machine as well as subsequent production cycles. A ratio of the average viscosity in a given cycle relative to the viscosity in either the qualifying cycle or a preceding cycle is utilized to adjust the holding time and cooling time, thereby achieving PVT optimization. In a second aspect, an injection molding machine is utilized to develop PVT constants for a given material by pressurizing the material in the barrel against the blocked outlet nozzle, measuring the volume during pressurization, and then weighing the pressurized shot after it is purged from the barrel in order to calculate the specific volume of the material. Plotting specific volume against a variety of pressure and temperature values produces a plot of PVT relationships from which the constants can be derived.
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The Society of Plastics Engineers--Pittsburgh Section, "Injection Molding--The Next Five Years", Author: Wolfgang Meyer, Nov. 1985.
Plastics Technology, Nov., 1985, p. 25, "PVT Holding-Pressure Control: Here's What it Can do For You".
Heitbrink Jill L.
HPM Corporation
Silbaugh Jan H.
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