Test & measurement
Many GEMÜ valves are manufactured using spe- cial plastics according to precisely defined quality criteria – now with the help of STASA QC Optimize from Kistler.
In a current project, GEMÜ was faced with the challenge of achieving low surface roughness for a highly specialised part. Pllana reports: “The existing production process did not meet our requirements. Without a suitable process foundation, we needed
Instrumentation Monthly October 2025
to redevelop the entire process chain. STASA QC Optimize provided vital support.” During statistical test planning with STASA QC, a pre-defined number of tests (at least 10) are carried out to determine the optimal machine and process parameters. The software analyses typical actuating variables such as injection speed, holding pressure, injection pressure, and cylinder temperature; it then identifies main effects, causalities and interactions, thus compiling comprehensive process knowledge. “It is easy to operate, which means users can be trained and start using the software quickly. Another decisive factor was that STASA QC allows us to model attributive quality characteristics like surface quality,” Pllana continues.
DESIRED SURFACE QUALITY ACHIEVED WITH A HIGH DEGREE OF PROCESS STABILITY
In this case, in order to achieve the desired surface quality, an additively manufactured device was integrated into the fully automated process, which was also validated via DoE. On the basis of the data
analysis with STASA QC Optimize and after a total of three test series (DoEs), GEMÜ was able to implement a sustainable and efficient injection molding production process with a high degree of process control. This success also allowed Fritzsche and Pllana to achieve greater acceptance of the use of STASA QC within the GEMÜ Group: the software from Kistler is now used as standard in the second phase of mold validation for special product groups (meaning after the mold is inspected and approved in phase 1). Marcel Fritzsche continues: “Thanks as well to the excellent support from Kistler, STASA QC Optimize offers us a software solution that enables robust, digitalised, future-proof production processes, all the way to digital twins. Thanks to precise data analysis across the entire development process, we are able to handle complex customer requests with exacting requirements in a targeted, efficient manner – now and in the future.”
Kistler
www.kistler.com 37
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