Capillary rheometer plunger pressure transducer and...

Details Capillary rheometer plunger pressure transducer and... Capillary rheometer plunger pressure transducer and...

G - Physics

01

N

G01N 11/08 (2006.01) G01L 9/00 (2006.01) G01N 11/06 (2006.01) G01N 33/44 (2006.01)

Patent

CA 2103317

ABSTRACT A capillary rheometer apparatus includes a housing, a plunger, the housing having a reservoir for receiving the plunger in a polymer melt, and a mechanism for blocking flow of the melt out of the reservoir. A driving mechanism is included for driving the plunger longitudinally within the reservoir to move one end of the plunger in contact with the melt. A diaphragm, which is coupled to the one end of the plunger, deflects in response to melt pressure in the reservoir. A mechanism, responsive to diaphragm deflection, determines pressure of the melt. Another mechanism is included for determining the temperature of the melt and a further mechanism is included for indicating longitudinal movement of the plunger. From such determinations, the PVT characteristics and the apparent shear viscosity characteristics of the polymer melt can be obtained.

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