In-line polymer melt rheometer

Details In-line polymer melt rheometer In-line polymer melt rheometer

1990-06-27

1992-01-07

Williams, Hezron E.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Viscosity

G01N 1104

Patent

active

050780077

ABSTRACT:
An apparatus and a process for quickly and accurately determining in-line the rheology of molten polymer streams, said apparatus comprising a cam member and a pressure wall member, one of which is a rotating member and the other one is a stationary member, the rotating member dragging molten polymer into a wedge-shaped clearance between the cam member and the pressure wall member, polymer pressure within the clearance being sensed by a pressure detection device capable of producing a signal responsive to said pressure in the form of a display, a graph, or an arbitrary numerical value, but preferably being transmitted to a computer programmed to calculate apparent melt viscosity of the polymer by the application of the Reynold's theory of lubrication.

REFERENCES:
patent: 3841147 (1974-10-01), Coll et al.
patent: 4213747 (1980-07-01), Friedrich
patent: 4241602 (1980-12-01), Han et al.
patent: 4468953 (1984-09-01), Gerritamo
patent: 4541270 (1985-09-01), Hanslik
patent: 4721589 (1988-01-01), Harris

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