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Your search keyword '"Rheometers -- Innovations"' showing total 10 results
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10 results on '"Rheometers -- Innovations"'

1. A sliding plate normal thrust rheometer for molten plastics

Author

Oakley, J.G. and Giacomin, A.J.

Subjects
Rheometers -- Innovations, Shear flow -- Measurement, Plastics -- Production processes, Engineering and manufacturing industries, Science and technology
Abstract

A sliding plate rheometer has been developed to measure the normal thrust of a molten plastic in large amplitude oscillatory shear. The normal thrust of a molten plastic in large amplitude oscillatory shear is a significant nonlinear effect that has previously been unobtainable. Normal thrust measurements may now be used to help understand and characterize nonlinear viscoelastic behavior inherent in most molten plastics. The new rheometer incorporates a piezoelectric pressure transducer in a very stiff plate that minimizes compliance. Normal thrust measurements with cone and plate rheometers are made by measuring the total force on the plate (or cone) and are subject to error due to edge effects. The new rheometer measures the local pressure in the sample and is therefore unaffected by sample size or edge effects. Normal thrust measurements in large amplitude oscillatory shear are reported for both molten Phillips TR480 high density polyethlene pipe resin which contains 2% by weight of carbon black filler and IUPAC LDPE X. Crosstalk due to shear stress on the active face of the pressure transducer causes signal error which for oscillatory shear is filtered out using a discrete Fourier transform.

Published
1994

2. A pulse rheometer for reacting foams

Author

Carriere, Craig J., Bank,David H., and Christenson, Christopher P.

Subjects
Rheometers -- Innovations, Polymers -- Rheology, Plastic foams -- Equipment and supplies, Viscoelastic materials -- Equipment and supplies, Engineering and manufacturing industries, Science and technology
Abstract

Measuring foams' properties is a very complex task in cellular polymer research. A newly developed rheometer successfully applies the impulse theory of linear viscoelasticity, obtaining data before and after gelation, through the zero-shear viscosity and equilibrium modulus, with a precision of better than plus or minus 15%. It can also determine the viscous, viscoelastic or elastic state of a material. The device, an add-on fixture for the Materials Testing System Model 312, operates under gap-loaded conditions and is of large-volume parallel-plate design.

Published
1992

3. Viscoelastic characterization of rubber with a new dynamic mechanical tester

Author

Pawlowski, Henry and Dick, John

Subjects
Viscoelasticity -- Testing, Rubber -- Testing, Rheometers -- Innovations, Business, Chemicals, plastics and rubber industries
Abstract

Problems associated with using conventional dynamic mechanical rheological testers (DMRT) in the viscoelastic measurement of rubber properties include sample-preparation complexities and long sweep-test times. A new DMRT, the RPA 2000, requires no difficult sample-preparation procedures, allows samples to be kept under pressure during testing and supports single-test before-, during- and after-cure testing of samples., Rubber has both viscous and elastic responses to deformation. A viscous response is proportional to the rate of deformation while an elastic response is proportional to the amount of deformation. [...]

Published
1992

4. New rheometer and Mooney technology

Author

DiMauro, Patrick J., de Rudder, J., and Etienne, J.P.

Subjects
Rheometers -- Innovations, Viscosimeter -- Design and construction, Measuring instruments -- Design and construction, Business, Chemicals, plastics and rubber industries
Abstract

New rheometer and Mooney technology About 18 months ago Monsanto introduced prototypes of three totally new instrument designs - an oscillating disk rheometer (ODR 2000), a rotorless or moving-die rheometer [...]

Published
1990

5. The capillary rheometer: applications in the plastics industry

Author

DeLaney, Don and Houlston, Steve

Subjects
Rheometers -- Innovations, Plastics industry -- Equipment and supplies, Plastics machinery -- Analysis, Business, Chemicals, plastics and rubber industries
Abstract

The capillary rheometer is an improvement on the more common melt flow index and melt flow rate machines as it has been found to better address more advanced moulding and extrusion applications. This more complex machine can be used to measure the flow properties of a material over the full range of rates, geometry, forces and temperatures during the actual conversion of thermoplastic materials from pellets into moulded parts. It also provides other applications, such as grading polymers, process control optimization, temperature sensitivity, thermal stability and processing effects.

Published
1996

6. Instrumentation for rheological measurements of food

Author

Shoemaker, C.F., Lewis, J.I., and Tamura, M.S.

Subjects
Food industry -- Equipment and supplies, Rheometers -- Innovations, Rheology -- Research, Business, Food and beverage industries
Published
1987

9. Rheology

Subjects
Brabender OHG -- Product information, Monsanto Co. -- Product information, Dynisco Inc. -- Product information, Rheometers -- Innovations, Machinery industry -- Product information, Business, Chemicals, plastics and rubber industries, Engineering and manufacturing industries
Published
1992

10. Precision instruments leave lab, enter process areas

Subjects
Control equipment industry -- Innovations, Rheometers -- Innovations, Viscoelasticity -- Measurement, Electron spectroscopy -- Usage, Pressure gages -- Innovations, Business, Engineering and manufacturing industries, Metals, metalworking and machinery industries
Abstract

Partial pressures controlled in a reactive system. Reactive-deposition processes, which apply wear and decorative coatings, often use nitrogen, oxygen, and argon. Matching gas input flow to process consumption rate is [...]

Published
1989

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