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come influiscono i parametri di processo sulla temperatura della mescola durante lo stampaggio ?

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"shear heating" e il Controllo OTTIMALE della temperatura della mescola

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Injection molding is a widely used technology for producing rubber technical parts. The quality of the final product depends on various parameters related to rubber properties, mold design, process setup parameters, and injection molding machine capability. The temperature of the rubber compound during the injection stage is a critical parameter that influences the final quality of the parts. Increasing the temperature reduces the viscosity of the rubber compound, but it may trigger the curing reaction, causing viscosity to increase and flow to stop. The rubber temperature during flow cannot be directly controlled, as it is affected by various factors, including shear heating. Controlling the injection molding process is essential to improve the quality of final products and reduce waste production. The processability of raw rubber also needs to be continuously monitored as it is subject to fluctuations, which affect the processing window. The control of the process is typically achieved through the setup of machine parameters and laboratory tests on compounds before production run, and/or sorting of faulty parts after production run. However, online monitoring could potentially help modify machine setup parameters at the first signs of defect formation, minimizing the time between defect occurrence and corrective measures implementation [1,2,3,4]. In recent years, advances in sensing and monitoring technologies have enabled online monitoring of the injection molding process. This allows for real-time feedback and adjustment of machine parameters, reducing the occurrence of defects and waste production. Furthermore, the use of advanced data analytics and machine learning techniques can help to identify patterns and predict the occurrence of defects, providing early warning signals to operators. This can greatly improve the efficiency and effectiveness of the injection molding process, leading to cost savings and environmental benefits. Another important aspect of injection molding is the design of the mold. The mold design must take into account the properties of the rubber compound, the injection molding machine, and the final product requirements. It must also consider factors such as cooling time, ejection force, and venting. Poor mold design can lead to defects such as flash and warpage. Therefore, the mold design process should be carefully optimized to ensure that it produces high-quality parts with minimal waste. Computer-aided design and simulation tools can be used to aid in the mold design process, enabling the identification of potential issues before production runs


[1] "Monitoring of shear heating effects during injection molding of rubber to improve the process control", M. Ramini, S.Agnelli - Polym. Bull. 80, 6707–6723 (2023).

[2] "Temperature profile in rubber injection molding: application of a recently developed testing method to improve the process simulation and calculation of curing kinetics." - Traintinger M, Kerschbaumer C, Lechner B, Friesenbichler W, Lucyshyn T (2021) - Polymers 13:380.

[3] Sommer J (2013) Troubleshooting Rubber Problems. Carl Hanser Verlag, Munich

[4] "Shear heating parameter of rubber compounds useful for process control in injection molding machine." M. Ramini, S.Agnelli - Rubber Chem Technol 93(4):729–737 (2020)

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