Schaffhausen, Switzerland
Schaffhausen, Switzerland

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Bader C.,Priamus System Technologies AG | Kristiansen M.,University of Applied Sciences and Arts Northwestern Switzerland
Kunststoffe International | Year: 2011

The control of melt flow and viscosity through pressure and temperature sensors in injection molding tools is a major prerequisite for machine independent quality control of a molded part. A certain separation between the measurement points allows the determination of values that describe the melt flow. A pressure and a temperature sensor were installed in the direction of flow and then, using an automated process based on the average wall thickness and the spacing between the two sensors, both shear rate and shear stress could be better determined directly in the cavity itself. The basis for the calculations was provided on the one hand by the acquired flow time of the melt between the two sensors and on the other hand by the internal cavity pressure measured at the time the melt reached the second sensor. The investigations have revealed that apart from the parameters that can be measured such as strength, molded part dimensions and weight the reproduction accuracy of micro and nanostructures can be influenced and controlled in a targeted manner.

Bader C.,Priamus System Technologies AG | Zeller S.C.,Electronics Development
Kunststoffe International | Year: 2010

The injection molding process as such can be regarded as a temporal sequence of defined switching processes is discussed. High-speed switching systems banish instable processes and faulty molding from day-to-day production. The quality of a machine controller or a super ordinate open-loop or closed-loop control system is ultimately determined by how quickly, how reliably and with what repetition accuracy a switching process is performed. Automatic switching processes adapt automatically to the process conditions and provide a precise switching signal, irrespective of the settings. The smaller standard deviation also favors the automatic switching processes. The automatic determination of the viscosity directly in the mold offers an instrument for the first time that visualizes the effective fluctuations in the flow properties during the injection process.

Bader C.,Priamus System Technologies AG
Kunststoffe International | Year: 2015

The injection molding world and its quality standards have changed over past years and decades. Even if one dogma or the other still stubbornly persists in the heads of some processors, there is one accepted principle: Without sensors in the mold or directly on the molded part, it is neither possible to identify and eliminate rejects, nor to selectively control and regulate changes in the process. However, this is the prerequisite for reliable, stable and automated production. © Carl Hanser Verlag, Munich.

Bader C.,Priamus System Technologies AG | Konig E.,Priamus System Technologies GmbH | Schmidt C.,Ensinger GmbH
Kunststoffe International | Year: 2013

A constant machine setting is by no means sufficient for constant part quality. The studies have demonstrated that different quality parameters of the molded part can be automatically regulated to a desired target value, avoiding the need for expensive downstream controls. The prerequisite for this is a cavity pressure sensor and a cavity temperature sensor, with a host computer interface for communication with the injection molding machine. The future will show to what extent validation processes, too, can be simplified and made more meaningful with this process. It is already foreseeable that it will be possible to transfer processes optimized in this way from one machine to another and from one production site to another.

Priamus System Technologies Ag | Date: 2012-01-16

A method for producing multilayer objects from a polymer melt, especially in an injection mold, especially preforms having a barrier layer, wherein a viscosity, especially a shear speed, of the melt is determined. The viscosity, especially the shear speed, of at least one layer is determined in the injection mold and optionally monitored and/or regulated.

Priamus System Technologies Ag | Date: 2014-11-24

A method for controlling the filling of at least one cavity in a device for producing an object, in particular in an injection molding machine, wherein a melt is inserted into the cavity through an opening, and the width thereof is altered, wherein the width of the opening is also to be changed and adjusted, that is, fixed, in a position between a closed position and a maximal open position.

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