사출성형 중 높은 전단속도에서 용융 수지의 점도 측정에 대한 연구
A study on the measurement of melt viscosity at the range of high shear rate during injection molding
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In this study, a mold for measuring melt viscosity was fabricated with a slit of 10mm in width, 0.5mm in thickness and 200mm in length. Two pressure sensors was installed in the slit to measure the viscosity of melt resin during injection molding. four different grades of PETG were used and the viscosity was measured in the injection molding machine with a screw diameter of 40 mm by setting the melt temperature to 220, 240, 260 ° C, and the injection speed of 10, 20, 30, 40 mm/s. The viscosity was calculated by the shear stress and shear rate, respectively, using the pressures measured at the pressure sensors during injection molding and the injection flow rate. The result showed that all four PETGs has a tendency of decreasing viscosity with increasing melt temperature and shear rate. This tendency was confirmed to be similar to that of PETG measured by general rheometer and the measured values were similar. Therefore, when the viscosity of the melt resin is measured with the injection rheometer, it was confirmed that reliable results of similar tendencies and levels as those of actual resins can be obtained at the range of high shear rate.
Abstract
In this study, a mold for measuring melt viscosity was fabricated with a slit of 10mm in width, 0.5mm in thickness and 200mm in length. Two pressure sensors was installed in the slit to measure the viscosity of melt resin during injection molding. four different grades of PETG were used and the viscosity was measured in the injection molding machine with a screw diameter of 40 mm by setting the melt temperature to 220, 240, 260 ° C, and the injection speed of 10, 20, 30, 40 mm/s. The viscosity was calculated by the shear stress and shear rate, respectively, using the pressures measured at the pressure sensors during injection molding and the injection flow rate. The result showed that all four PETGs has a tendency of decreasing viscosity with increasing melt temperature and shear rate. This tendency was confirmed to be similar to that of PETG measured by general rheometer and the measured values were similar. Therefore, when the viscosity of the melt resin is measured with the injection rheometer, it was confirmed that reliable results of similar tendencies and levels as those of actual resins can be obtained at the range of high shear rate.
참고문헌 (5)
- Shi, X., "Nonlinear Fitting Technology of 7-Parameter Cross-WLF Viscosity Model", Adv. Mater. Res., 189-193, pp.2103~2106 (2011)
- 정태성, "박형 도광판의 고속사출성형을 위한 수지 점도 측정 및 수치해석", 소성∙가공, 23(1), pp.41~48 (2014), 한국소성∙가공학회
- Han, C. D., "On Silt- and Capillary-Die Rheometry", Trans. Soc. Rheol., 18, pp.163~190 (1974)
- Gao, R. X., "Online product quality monitoring through in-process measurement", CIRP Annals-Manuf. Technol., 63, pp.493~496 (2014)
- Chen, J. Y., "Online quality monitoring of molten resin in injection molding", Int. J. Heat Mass Transfer., 122, pp.684~693 (2018)