Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling heat transfer with molding material
Patent
1995-09-25
1998-02-24
Heitbrink, Tim
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
057209120
ABSTRACT:
A method for controlling the temperature of injection molding machines using cross-linking polymers and molding die units using plastics. Each unit is equipped with at least one cooling channel for circulating a temperature controlling medium therethrough. The temperature of the exhausted medium is compared to a desired value and the circulation of the medium is adjusted accordingly. The method includes the steps of calculating the heat dissipation within a cycle and presetting the desired heat dissipation, prior to the start of temperature control. The temperature of the exhausted medium and the feed medium are continuously measured. The heat content value WRG of the unit is determined once the unit reaches thermal equilibrium. The value WRG is stored in a subsequent cycle as a desired value based on the difference between the temperature of the exhausted medium and the feed medium during a reference cycle. The desired value is compared with the instantaneous actual value measured during all subsequent cycles. A correction value is determined based on the deviation of the heat content from the reference cycle. The temperature control impulses trigger at point Z.sub.1 and terminate at Z.sub.2 at the latest. Events Z.sub.1 and Z.sub.2 are preset signals from the unit sequence controller.
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Plaste Und Kautschuk--Werkzeugtemperierung Als Dritte Funktion Der Spritzgiessmaschine Prof.Dr.-Ing Igor Catic, Dipl.-Ing Ivan Ranogajee, Dipl.-Ing Dragutin Simon--1982--p. 86.
Fachbeitrag--Formtemperierung Durch Temperaturmessung Am Spritzgiesswerkzeug--Jun. 1985.
Hofmann Dietmar
Liehr Erich
Heitbrink Tim
Kunststofftechnik F. u. H. Riesselmann GmbH
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