Thin-wall Injection Molding – a dimensional analysis and scaling analysis approach
Due to high molding pressures, as well as physical effects such as pressure dependent viscosity and rapid cooling, today’s numerical simulations are not succesful in accurately predicting filling during molding of thin parts. A dimensional analysis was performed, considering the most relevant variables. The dimensionless groups were used in a similarity analysis to scale the part by reducing the thickness. The resulting relations between process conditions, material properties and other physical parameters were used to determine interactions between the parameters during pressure flow by mantaining constant viscous heating. The analysis revealed a strong effect of pressure-dependent viscosity on mold filling pressure requirements.
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The Journal of Plastics Technology is a peer reviewed internet periodical published under the auspices of the Scientific Alliance of Polymer Technology (WAK)
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