Abstract: A magnetic resonance analyzing apparatus includes a sampling region; a first temperature stabilization assembly for maintaining the sampling region at a predetermined temperature; a magnet for applying a base magnetic field to the sampling region; a coil for applying a first 0.degree. phase excitation pulse to the sampling region at a first time, and a second 90.degree.

Abstract: An improvement in a rheometer and the method for measuring rheological properties of a viscoelastic test specimen at different temperatures, at which different temperatures the viscoelastic properties exhibit a relatively wide difference, wherein the test specimen is placed between and is coupled with opposed plates, one of the opposed plates is oscillated angularly relative the other of the opposed plates, and the angular displacement of one of the plates relative to the other of the plates and the torque associated with the relative angular displacement are measured within an optimum range of torque and angular displacement for determining the rheological properties, couples a first contact area on one of the opposed plates with the test specimen when the test specimen is at one of the different temperatures, and couples a second contact area on the one of the opposed plates with the test specimen when the test specimen is at another of the different temperatures, the first contact area being different from

Abstract: On-line rheological measurements are made utilizing a rheometer of the type in which a first metering pump delivers diverted melt from a process main stream to a capillary passage and a second metering pump returns the diverted melt from the capillary passage to the process main stream and the viscosity of the diverted melt is measured by controlling the rate of flow of the melt through the capillary passage to maintain constant the pressure drop between spaced apart locations along the capillary passage and measuring the temperature of the melt in the capillary passage. The measurements may be made while controlling the speed of the second metering pump independent of the speed of the first metering pump to maintain the pressure at the exit of the capillary passage essentially constant.

Abstract: An improvement in a rheometer and the method for measuring rheological properties of a viscoelastic test specimen at different temperatures, at which different temperatures the viscoelastic properties exhibit a relatively wide difference, wherein the test specimen is placed between and is coupled with opposed plates, one of the opposed plates is oscillated angularly relative the other of the opposed plates, and the angular displacement of one of the plates relative to the other of the plates and the torque associated with the relative angular displacement are measured within a predetermined optimum range of torque and angular displacement for determining the rheological properties, couples a first contact surface on one of the opposed plates with the test specimen to establish a first contact area between the one of the opposed plates and the test specimen when the test specimen is at one of the different temperatures, and couples a second contact surface on the one of the opposed plates with the test specime

Abstract: A rheometer and a method for measuring rheological properties of a fluid material, especially in an in-line arrangement in a manufacturing process, include capturing and confining a volume of the fluid material against movement within a chamber, advancing an orifice plate having an orifice into the confined volume of the fluid material in the chamber such that the fluid material flows relative to the orifice to pass through the orifice plate, and determining the pressure in the confined volume of fluid material as the orifice plate is advanced into the chamber and through the confined volume of fluid material and the fluid material passes through the orifice, the pressure being indicative of the rheological properties being measured.

Abstract: Apparatus and method for measuring the shear viscosity of a fluid urges sample fluid through a gap between a sleeve having an axial passage and a pin extending axially into the passage in the sleeve to subject the sample fluid to shear while measuring the axial force tending to move the pin and the sleeve axially away from one another, the axial force being indicative of the shear viscosity of the sample fluid.

Abstract: On-line rheological measurements are made utilizing a rheometer of the type in which a first metering pump delivers diverted melt from a process main stream to a capillary passage and a second metering pump returns the diverted melt from the capillary passage to the process main stream and the viscosity of the diverted melt is measured by controlling the rate of flow of the melt to maintain constant the pressure drop between spaced apart locations along the capillary passage and measuring the temperature of the melt in the capillary passage. The measurements may be made while controlling the speed of the second metering pump independent of the speed of the first metering pump to maintain the pressure at the exit of the capillary passage essentially constant.

Abstract: A test fixture for use in measuring the forces required to bend a test specimen throughout a range of temperatures includes clamps for gripping the ends of the test specimen while bending forces are applied intermediate the ends of the specimen, the clamps being carried by carriages movable in directions aligned with the test specimen and biased away from one another by constant force springs so that movement of the ends of the test specimen is permitted in response to temperature changes in the test specimen, against the constant bias of the constant force springs, thereby maintaining the test specimen in constant tension during the measurement of bending forces despite the changes in temperature.

Abstract: Impact testing apparatus in which a weighted dart is dropped from a prescribed height to penetrate a test specimen when traveling at a desired velocity and level of kinetic energy, the acceleration of the dart being assisted by a spring force in the direction of travel so that the prescribed height is maintained at a minimum for a given desired velocity and the dart being guided to the test specimen by a generally tubular guide within which the dart is loosely fitted. A force transducer is located at the tip of the dart for providing impact force information as the tip penetrates the test specimen.

Abstract: Apparatus and method for measuring the viscous component and the elastic component of forces within a viscoelastic test specimen placed in shear, the test specimen being coupled to a platen having a rest position, the platen being displaceable from the rest position rotationally and axially relative to a fixed axis in response to rotational and axial forces exerted by the test specimen upon the platen as a result of the viscous component and the elastic component, the apparatus and method including an arrangement of component parts and a plurality of steps for establishing a rotational counterforce for balancing the rotational force on the platen and simultaneously establishing an axial counterforce for balancing the axial force on the platen to maintain the platen at the rest position, and indicating the magnitude of the counterforces necessary to maintain the platen at the rest position, whereby the viscous component and the elastic component of forces are measured at zero compliance.

Abstract: A rotational rheometer utilizes a rotor coupled to a test specimen and suspended in a stator by a low friction bearing suspension system, a compensation arrangement which compensates for bearing torque on the rotor throughout the full range of rotation of the rotor, and position transducers arranged for determining accurately both the angular position of the rotor throughout a full range of 360.degree. of rotation, and the longitudinal position of the rotor, relative to the stator.

Abstract: Disclosed herein is a torsion tube apparatus for making on-line measurements of the viscosity and elasticity of a fluid. The apparatus includes a housing member, an outer cylinder having one end rotatably mounted with respect to the housing member, and a motor for rotating this outer cylinder. An elongated torsion tube is mounted concentrically within and spaced from the outer cylinder and has one end fixed to the housing member, with its other end freely disposed within the cylinder for torsional movement with respect to the fixed end. Therefore, an annular void is defined between the tube and cylinder. Fluid may be introduced through a conduit into the interior of the cylinder for flow therethrough and discharge therefrom, such that rotating motion of the fluid caused by rotation of the cylinder exerts a torsional force directly on the outer surface of the tube. A torsion indicating shaft extends concentrically through the tube, having its one end fixed to the free end of the tube.