Reservoir-slit rheometer for the viscosity measurement of fast-r

Details Reservoir-slit rheometer for the viscosity measurement of fast-r Reservoir-slit rheometer for the viscosity measurement of fast-r

1998-01-22

2000-02-15

Larkin, Daniel S.

Measuring and testing

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

Viscosity

73 5414, 73 5439, G01N 1108

Patent

active

06023962&

ABSTRACT:
A viscometer measures the rheological properties of polymers over a wide range of temperature, shear-rate and cure conditions, so that it can be used with extremely fast-changing resinous materials such as fast curing thermosets and fast crystallizing thermoplastics. The viscometer uses a mold made of three plates, clamped together during testing, with the center plate having at least one cavity (reservoir) and a slit from each reservoir to the ambient conditions outside the viscometer. Resin is injected into the reservoir in a short period of time. After filling the reservoir, the sample is heated to a test temperature through heat conduction from the reservoir wall. The heating is rapid because of the small thickness of the reservoir. The rapid filling and heating properties of the apparatus makes the rheology measurement of fast changing polymers possible. The sample is put under pressure by a piston and forced to continuously flow through the slit. At this slit, various measurements, including flow rate, pressure, temperature, and degree of cure are made. Using this instrument, the relationship between the viscosity as a function of temperature, shear-rate, and degree-of-cure can be determined.

REFERENCES:
patent: 3203225 (1965-08-01), Sieglaff et al.
patent: 5076096 (1991-12-01), Blyler, Jr. et al.
Blyler, L. L, H. E. Bair, P. Hubbauer, 8 Matsuoka D. S. Pearson, G. W. Poelzing, R. C. Progelhof and W. 0. Thierfelder, *A New Approach to Capillary Viscometry of Thermoset Transfer Molding Compounds, Polym. Eng. Sci., 26, (1993).
Dealy, J. M. and Wissbrun, K. F., Melt Rheology and Its Role in Plastics Processing Nostrand Reinhold, New York (1990).
Gonzalez, U., S. F. Shen and C. Cohen, Theological Characterization of Fastreacting Thermosets through Spiral Flow Experiments, Polym. Eng. Sci. 32, 172. (1992).
Halley, P. J. and Mackay, M. E., Chemorheology of Thermosets--An Overview, Polym. Eng. Sci., 36, 593 (1996).
Manzione, L. T., Plastic-Packaging of Microelectronic Devices, Van Nostrand Reinhold, New York (1990).
Nguyen, L. T., A. Danker, N. Santhiran and C. R. Shervin, "Flow Modeling of Wire Sweep during Molding of Integrated Circuits, " ASME Winter Annual Meeting (1992).
Turng, L. S. and V. W. Wang, "On the Simulation of Microelectronic Encapsulation with Epoxy Molding Compound, " 92, SPE RETEC, Raleigh, North Carolina, Nov. 10-12 (199 1).

Affiliated with

Also associated with

Rating

Reservoir-slit rheometer for the viscosity measurement of fast-r does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Reservoir-slit rheometer for the viscosity measurement of fast-r, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reservoir-slit rheometer for the viscosity measurement of fast-r will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1897024