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Cálculo y simulación de la transferencia de calor en un molde de inyeccion para tapas de polipropileno en Tecnoplast S.A.S
Fecha
2017-10-02Autor
Almeida Osorio, Viviana Andrea
Institución
Resumen
Polymer injection processes involve high energy consumption both in the process of heat transfer to the polymer to modify its state and for the cooling system of the mold, therefore, this makes them susceptible to efficiency analysis.
The company TECNOPLAST SAS has in its production plant with 26 injectors, 24 of hydraulic type and 2 of electrical type for which it has not been characterized: The thermal load that the refrigeration system must extract from the injection molds, the flow rate of the refrigerant fluid circulating through the cavities, speed and pressure of the refrigeration circuit, among other relevant parameters of operation. Based on the need to characterize the cooling system of one of its injection processes that produces polypropylene homo polymer (PPH) caps, this work presents experimental, calculated and simulated results of the aforementioned parameters and those parameters that are relevant in the process of heat transfer between the injection mold and the cooling system thereof. The results presented characterize the current operating conditions of the system in the plant and show calculations and simulations of other possible configurations for the cooling system.
In particular, the actual operating parameters are established in the plant and calculated results are obtained such as: the temperature difference of the refrigerant fluid between the inlet and outlet of the injection mold, flow rate of the refrigeration circuit, thermal load per cycle that It must be extracted from the injection mold in the process of injection of a commercial lid of PPH. The simulation of the heat transfer process in Ansys CFX of a cooling circuit of the plate containing the mold cavities is presented based on the average values of the actual operating parameters measured in the equipment and finally changes are proposed in the mold cooling system based on the results obtained in the modeling and simulation carried out