Abstract: A rotary rheometer has a measurement motor (1) rotating a measuring shaft (16) on which an upper, and in particular a plate-shaped or conical, measuring part (4) is fastened. A measuring gap (S) is formed between the first measuring part (4) and a rotationally fixed lower, preferably plate-shaped measuring part (5). The substance (12)—in particular fluid, gel, or the like—to be tested is introduced into the measuring gap (S). The width of the measuring gap (S) can be adjusted by displacing the two measuring parts (4, 5) relative to each other. A heating or tempering unit for the lower measuring part (5) is arranged below the lower measuring part (5). To heat or cool or temper the upper measuring part (4) at least one heat pump (24), and in particular at least one Peltier block, is provided by which heat can be supplied to or removed from the upper measuring part (4).

Abstract: Viscometer (2) with a sleeve (30) rotatable by a sprocket (20) and a timing belt (44) to shear a tested fluid thus imparting torque to a bob (28) mounted on a shaft (14) supported via axially spaced bearings (16, 22), an arm (12) connecting to the top of the shaft (14) applies force to a force sensor (10) which is proportional to the torque applied to the bob.

Abstract: A rotary viscometer is described where there is no mechanical linkage between a rotor that is rotated in a test fluid to measure viscosity and the rotor drive source. A rotor is disposed in a test fluid within a test chamber. The rotor is mounted on low friction bearings. Electromagnets disposed around the test chamber impose a constant torque on the rotor. Rotor rotation rate corresponding to fluid viscosity is measured. The viscometer may have a sealed test chamber for measuring viscosity of hazardous or corrosive test fluids without exposing the operator to the fluid.

Abstract: The invention comprises measuring or responsive instruments, including (but not limited to) viscometers, having a music wire (20) or like high tensile wire support between driving/driven shaft assemblies (18, 16) and appropriate mounting to eliminate drag, friction, radial misalignment, vibration problems, especially at high rotational speeds, and afford an enhanced accuracy and speed of measurement or other response of the instrument as a whole, including such specific features allowing large angular deflections or small ones (full scale under one degree) and axial and radial rigidity. The instrument can also be used with a plate for cone plate, oscillation and normal force measurements.

Abstract: A rotational rheometer has a cylindrical outer housing into which a measuring container can be inserted substantially coaxially thereby forming a radial annular space. The measuring container has a measuring chamber for receiving a sample material. A fluid may flow through the annular space to bring the outside of the measuring container and thereby the sample material to a desired temperature. The fluid is a gas and a circulating device is provided within the outer housing for circulating the gas.

Abstract: A curing characteristics measuring apparatus in which a sample chamber having a fixed surface and a rotation-vibrating drive surface is charged with a sample having a viscoelasticity, a torsional vibration is applied to the sample through the drive surface, a shearing stress generated in the sample is observed as a torque through the fixed surface or the drive surface, wherein mechanism is provided for reducing volume of the sample chamber following volume contraction generated in curing process of the sample.

Abstract: The invention relates to an apparatus and a method for determining the viscosity (&eegr;) of a fluid (1). The apparatus includes an electrical rotary drive (2) with a stator (3), which has a stator winding (4), and with a rotational body (5) which can rotate in the fluid (1). The rotational body (5) is designed as a rotor (5) of the rotary drive (2) and is magnetically journalled in a contact-free manner with respect to the stator (3).

Abstract: A rotational rheometer has an integrating motor (1), which rotates a measuring shaft (16) supporting a first measuring element (4), there being formed between this first measuring element (4) and a further, fixed measuring element (5) a measurement gap (S), into which is introduced the substance to be tested (12), in particular fluid, the depth of the measurement gap (S) being variable by the adjustment of the two measuring elements (4, 5) relative to each other, and a device being provided to determine the distance between the two measuring elements. At least one inductive or at least one magnetic position sensor (19, 21) is supported by one of the two measuring elements (4, 5). The first measuring element (4) or a device (18) disposed on this measuring element (4) can cause the position sensor (19, 21) disposed on the other measuring element (5) to respond, or can cause the output signal, e.g.

Abstract: A rheometer incorporates a blade (1) mounted for rotation about an axis (2). The blade is of twisted form such that it has first and second regions. A first region of the blade (1) substantially at the axis of rotation (2) has a first angle formed by its surface with respect to a plane perpendicular to the axis of rotation such that the surface of the blade in the first region extends substantially parallel to the axis of rotation. A second region of the blade spaced from the axis of rotation has a second angle, different to the first angle, formed by its surface with respect to the plane perpendicular to the axis of rotation.

Abstract: Physical property of a liquid sample to include a viscometric and/or rheological property if not a structural property such as gelation and/or crystallization can be determined with a rotating viscometer employed in a Scanning Brookfield technique. The viscometer and technique employ a Brookfield-type head having a high torque capacity. Low temperatures may be employed in the scan. For example, properties of a motor oil having a very high viscosity and/or a gelation point owing to its intrinsic properties, oxidation and/or sooting and so on, can be accurately, precisely, rapidly, and repeatably determined.

Abstract: Slurry useful for wire-saw slicing has viscosity adjusted to 400-700 mPa·second at a shear speed of 2/second and of 50-300 mPa·second at a shear speed of 380/second. The viscosity of slurry is measured using a cone and plate type viscometer which can measure viscosity at different shear speeds. Since the slurry sufficiently flows into inner parts of grooves formed in an ingot and consumed for wire-saw slicing due to the viscosity controlled in response to the shear speed, the ingot can be efficiently sliced to wafers or discs.

Abstract: The invention comprises measuring or responsive instruments, including (but not limited to) viscometers, having a music wire (20) or like high tensile wire support between driving/driven shaft assemblies (18, 16) and appropriate mounting to eliminate drag, friction, radial misalignment, vibration problems, especially at high rotational speeds, and afford an enhanced accuracy and speed of measurement or other response of the instrument as a whole, including such specific features allowing large angular deflections or small ones (full scale under one degree) and axial and radial rigidity. The instrument can also be used with a plate for cone plate, oscillation and normal force measurements.

Abstract: A viscometer for measuring liquid viscosities based upon rotational deflections of a suspended bob. The viscometer comprises a deflection indicator, a deflection reader located at a spaced relative position with respect to the indicator, a rotating element which rotates in unison with the bob and includes either the deflection indicator or the deflection reader, and a magnetic bearing assembly which prevents any substantial change in the spaced, relative position of the deflection reader with respect to the deflection indicator.

Abstract: A viscometer for sensing or characterizing the stress required to shear a fluid at a given rate includes a pair of members coaxially mounted for relative rotation. Between the members is an annular gap defining a flow path for the fluid. The flow path is configured such that during differential rotation of the members, fluid is caused to flow through the annular gap that is a function of the differential rotation and the viscosity of the fluid. A sensor measures the torque or torque equivalent required to achieve such differential rotation between the members.

Abstract: Low heat-transmissible spindle for rotary viscometry includes an elongate, radially balanced, straight shaft made of a suitably stiff material having a low heat-transmission value, with a head monolithic with the shaft which can contact and interface with a test fluid to yield drag from the contact and interface when the spindle is rotated in the fluid; and a spindle coupling nut attached to the shaft opposite the head. For example, the shaft may be made of a woven glass fabric cylinder laminated with a synthetic resin, and the head made of stainless steel. A rotary viscometer can be equipped with the spindle, and fluid viscosity can be determined by employing the same in a rotary viscometric protocol, for example, ASTM D 2983.

Abstract: A viscosity measuring apparatus of the invention is provided with a memory for storing numeric data corresponding to a plurality of sampling conditions set in advance, and an operating device or a data calling key for calling data in the memory. By operating the operating device or key, the necessary data, such as a plurality of Mooney values or plurality of scorch times set in advance, is displayed as numeric values in a display at any time during the test. Therefore, during the test, a user of the apparatus can determine whether the test should be continued or not, or analyze the data.

Abstract: In a viscosity measuring apparatus, a time for restoring to a set temperature from a lowered temperature in a material chamber when a material is filled in the chamber can be selected. Thus, a temperature rising speed of the material can be freely set to measure a viscosity. Therefore, it is possible to measure the viscosity when the material, such as rubber, is heated at the temperature rising speed in conformity with an actual molding condition. Also, in order to compare a result measured in the past, it is possible to measure the viscosity when the material is heated at the temperature rising speed in conformity with the past measuring condition.

Abstract: A device for the on-line measurement of viscosity and/or level of molten glass, converting the values of these variables into proportional electrical signals. The device comprises one sensor head connected to an electronic control unit and to a data processing unit. The sensor head comprises a fixed metallic core with external fins for air cooling, laid across by two vertical parallel shafts designed for torsional vibration to which are fixed, at the lower extremities, refractory rods partially coated with platinum and, at the upper extremities, the rotors of the two electrical motors which can produce torsional vibration of the vertical shafts. To each shaft are fixed two discs, connected mechanically to the fixed core by three fine rods disposed at 120° angles around the shaft. In operation, the sensor head is installed on a rigid structure fixed over the channel where the molten glass flows, with both rods partially immersed into the melt in order to be protected by the platinum coatings.

Abstract: A system and a method for generating die swell/draw down information for a profile extrusion die design. A rheometer having a slit die and a puller mechanism coupled thereto provide the die swell/draw down information of a polymer resin material in two dimensions—in the thickness direction and in the width direction. A processor uses the die swell/draw down information to generate a die design chart that contains representations of shear rate, draw rates, and thickness. A designer uses the die design charts to design a profile extrusion die.

Abstract: A rotary viscosimeter which has a rotary measuring cylinder that is disposed in a cylindrical measuring cup holding the sample to be tested in a measuring gap formed between the cylinder and the cylindrical wall of the cup. Forces required to rotate or angularly deflect the cylinder are measured and used to determine the viscosity of the sample. The temperature of the sample in the gap is maintained uniform by constructing the measuring cup of a good heat conducting material and surrounding it with a control cup, also constructed of a good heat conducting material, and the cups are configured to form an isolation gap between them. At least one heat pump in heat conducting contact with an outer surface of the heat control cup controls the heat flow to and from the heat control cup, and a good heat conducting contact area is formed between the cups at the upper ends of the measuring cup to provide a controlled heat flow to or from the measuring cup.

Abstract: A rotary viscometer has a measuring motor which drives a measuring shaft that carries a disc mounted in an air bearing of a stator. The viscometer has a normal force measuring drive defined by at least one position sensor for determinal movements of the measuring shaft on the basis of viscoelastic properties of the substance to be investigated, such as a liquid. To measure the normal force in the region of the air bearing, the position sensors are disposed in the region of the air bearing on the stator, and in particular they are embedded in the stator and absorb the movements of the disc in the axial direction of the measuring shaft with resect to the stator.