Flow characteristics of microchannel melts during injection molding of microstructure medical components

Guo Youdan

Abstract

It is shown by modifying and simulating the macro-molding Cross-WLF viscosity model and adopting polymethylmethacrylate (PMMA) to test and verify the flow characteristics of microstructure-formed microfluidics that, the mold temperature has the greatest impact on the flow characteristics of microchannel melts; when the mold temperature rises to 120°C, the condensate layer disappears, and the flow of melts is no longer affected by the mold temperature; when the ratio of the peak-valley size of microchannel surface roughness to the size of microchannel reaches 0.30, the microchannel is almost blocked by the condensate layer; when the contact angle θ of the surface tension of melts is smaller than 90°, the resistance of the surface tension to the flow of melts decreases with the decrease of θ; these unwanted effects could be eliminated by adopting the variotherm injection molding technology.