Phenomena and Control in the Making Process of Functional Thin-layer at Melt-Front Region with Melting High-Polymer Flow

摘要

In the melting of high-polymer material on industrial applications, unsteady flow phenomena occurs on its non-Newtonian properties. The unsteady interface phenomena in melt-front of high-polymer materials (PP) with several flow configurations (rectangular flow with 5mm & 1mm thickness, with/without patterned and artificial surface control) are assessed as local and unsteady geographic shape of the gas-liquid interface experimentally using images taken by high-speed CCD. From experiment results and considerations with wavelet analysis, the gas-liquid interface time-dependently changes its shape and fluctuating properties. Two-way phenomenal transition and all-over instability are also detected in the system, which that one is from the center to wall (fountain-flow-like), another is from near-wall to center by non-uniform slipping phenomena at near-wall region. These results under such experimental conditions have the different properties quantitatively, but not making clear yet. Moreover based on our findings, special thin film layer with functional effects has been tried with a artificial-layer on plate, particles-layer and melting mist flow.