METHOD FOR DETERMINING A VALUE FOR THE DESCRIPTION OF THE COMPRESSION OF A MOLDABLE MATERIAL

摘要

In a method for determining at least one parameter for the description of the compression behavior of a material processed in a molding machine, at least a part of the processed material is introduced into a mold cavity via a distribution system and a gate, and the processed material solidifies in the mold cavity. A compression test is performed in which a volume storing the material is modified and a measurement of the resulting pressure modification is conducted or a pressure applied onto the material is modified and a measurement of the resulting modification of the volume is conducted. A parameter for the description of the compression behavior is calculated based on the result of the compression test by using a mathematical model. The compression test is conducted when the gate is at least substantially solidified or when the hot runner is closed.

主权项

1. A method for determining at least one parameter for the description of the compression behavior of a material processed in a molding machine, wherein at least a part of the processed material is introduced into a mold cavity via a distribution system and a gate, wherein the processed material solidifies in the mold cavity, comprising the execution of at least one compression test in which a modification of a volume storing the material is made and a measurement of the resulting pressure modification is conducted or a pressure applied onto the material is modified and a measurement of the resulting modification of the volume storing the material is conducted, wherein at least one parameter for the description of the compression behavior is calculated based on the result of the at least one compression test by using a mathematical model, wherein the at least on compression test is conducted when the gate is at least substantially solidified or—if the molding machine comprises a closable hot runner arranged at the gate—when the hot runner is closed, so that a dead volume which reaches till the gate is considered in the calculation of the at least one parameter for the description of the compression behavior.