Capillary rheometer plunger pressure transducer and measurement

Details Capillary rheometer plunger pressure transducer and measurement Capillary rheometer plunger pressure transducer and measurement

1994-03-14

1995-05-23

Noland, Thomas P.

Measuring and testing

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

Viscosity

73715, G01N 1108

Patent

active

054171067

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.

REFERENCES:
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patent: 3349623 (1967-10-01), Paston
patent: 4680958 (1987-07-01), Ruelle et al.
patent: 5209107 (1993-05-01), Grudzien, Jr. et al.
"A simple capillary viscometer", C. Bowlt, Physics Education, vol. 10, No. 2, pp. 102-103, Mar., 1975.
"High-Pressure Capillary Viscometer (Exchange of Experience)", A. A. Bogatov, A. V. Serebryakov and V. I., Selivanov, Ural Polytechnical Institute, Sverdlovsk, vol. 57, No. 2, pp. 50-51, Feb., 1991.

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