Method and apparatus to control viscosity of molten plastics prior to a molding operation
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United States of America Patent
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Apr 3, 2001
Grant Date -
N/A
app pub date -
Jun 15, 1999
filing date -
Jun 15, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus and method for continuously reducing the viscosity of molten moldable polymeric material uses shear vibration under extensional flow to cause disentanglement. One or more station treatment cavities are defined by a gap composed of two closely separated surfaces in relative motion with each other at given speed and/or submitted to relative oscillations, with given frequency and amplitude to produce a shear deformation on the molten moldable material and a controlled variation of the gap dimension. The surface have a contour profile of ribs and/or bumps and/or grooves over which the molten moldable material can flow and/or can be dragged and/or is being pushed through and/or pumped through. The treatment cavities have an inlet through which the molten moldable material can pass into, and an outlet through which it can exit each treatment cavity.
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