Influence of reservoir diameter on the melt elasticity in capillary flow

摘要: An experimental study has been carried out to investigate the influence of reservoir-to-capillary diameter (DR/D) ratio on elastic properties polymer melts flowing through capillary tubes. For study, a rheometer, described in an earlier paper by Han, was used with DR/D ratios 3, 6, 9 and 12. Measurements were taken wall normal stresses high density polyethylene along axis capillary, axial pressure profile obtain “exist pressure,” which is believed be phenomenon. The analysis data indicates that, for given length-to-diameter (L/D) ratio, exit pressures first increase then level off, as increased. This behavior accord that extrudate expansion also determined experiment. dependence exist explained concept amount recoverable energy stored melt depends strain history, experiences entering capillary.