Horváth, Szabolcs and Kovács, József Gábor (2025) Determination of wall thickness effect of in-mold viscosity measurement under non-adiabatic, non-isothermal flow conditions. EXPRESS POLYMER LETTERS, 19 (3). pp. 246-257. ISSN 1788-618X
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Abstract
Measuring the viscosity of the melt contributes to the quality of injection molded products. Injection molding machines cannot give much feedback on the processes in the cavity, so pressure measurement inside the mold facilitates quality supervision. Our goal is to get more information about the viscosity of the material during filling in a traditional injection mold. A suitable and cost-effective method is to install cavity pressure sensors for the in-situ viscosity measurement. We prepared an experimental mold with variable wall thickness and 80×80 mm cavity dimensions. We implemented eight pressure sensors in each cavity. The wall thickness varied from 1 to 4 mm, and apparent viscosity was determined at different shear rates and mold temperatures. We measured non-isothermal and non-adiabatic flow during filling. The environment was quite different from that of standard measuring equipment. Based on the results, we effectively measured the material viscosity with a non-heated mold in the case of acrylonitrile-butadiene-styrene (ABS) and polypropylene (PP) material. The results were validated by measuring viscosity with a capillary rheometer and compared to our method using the non-heated mold, and the error was less than 10%. The results were accurate in a specific speed wall thickness range with PP and ABS.
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| Additional Information: | Funding Agency and Grant Number: National Research, Development and Innovation Office, Hungary [2020-1.2.3-EURE-KA-2021-00010, 2023-1.1.1-PIACI_FOKUSZ-2024-00011]; Recovery and Resilience Facility of the European Union [RRF-2.3.1-21-2022-00009]; Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund [TKP-6-6/PALY-2021] Funding text: This work was supported by the National Research, Devel-opment and Innovation Office, Hungary (2020-1.2.3-EURE-KA-2021-00010, 2023-1.1.1-PIACI_FOKUSZ-2024-00011) . The research was done under the scope of the Project no. RRF-2.3.1-21-2022-00009, entitled 'National Laboratory for Renewable Energy' which has been implemented with the support provided by the Recovery and Resilience Facility of the European Union within the framework of Programme Szechenyi Plan Plus. Project no. TKP-6-6/PALY-2021 has been implemented with the support provided by the Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund, financed under the TKP2021-NVA funding scheme. |
| Uncontrolled Keywords: | injection molding, viscosity measurement, cavity pressure sensors, wall thickness variation, apparent viscosity, non-isothermal viscosity, non-adiabatic viscosity |
| Subjects: | T Technology / alkalmazott, műszaki tudományok > T2 Technology (General) / műszaki tudományok általában |
| SWORD Depositor: | MTMT SWORD |
| Depositing User: | MTMT SWORD |
| Date Deposited: | 19 Jun 2025 13:33 |
| Last Modified: | 19 Jun 2025 13:33 |
| URI: | https://real.mtak.hu/id/eprint/220097 |
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