7 results about "Rheometry" patented technology

Rheometry systems for use with systems including pressurized polymer melt and / or other viscous materials are described. In one embodiment, a rheometer is connected to an associated system having a bent, curved, or bendable tube to allow the rheometer to measure rheological properties at a location that would otherwise be inaccessible to position the rheometer there due to the presence of an obstruction. Embodiments including rigid straight tubes for connecting the rheometer to the associated system are also described. In another embodiment, a flow-through rheometer is connected to an industry standard 1 / 2-20 thermowell orifice, which is commonly used to attach temperature and pressure probes to vessels containing viscous materials, such as extruders or injection molding systems.

The present invention relates to a thermoplastic polymer composition comprising a matrix polymer (A) and a polymer processing aid (B), wherein (δ polymer (B) - δ matrix polymer (A)) >= 2.0 (J1 / 2.cm-3 / 2), preferably > 3.0 (J1 / 2.cm-3 / 2) (where δ is a solubility parameter calculated according to the Fedor method), and the melt viscosity ratio of polymer (B) to matrix polymer (A) is less than 0.30, preferably less than 0.20 (where the melt viscosity is measured at 210°C and 100s). -1 This relates to thermoplastic polymer compositions (measured by capillary rheometry at shear rates).

Improved rheometry is provided using an autonomous swimming robot that can be driven at least in an angular velocity mode and in a torque mode. The resulting improved capability can enable measurement of multiple rheological parameters, such as both normal stress components ψ1 and ψ2, by observing motion of the robot in the fluid. The robot is preferably rotationally symmetric, but with a fore-aft head-tail asymmetry that enables propulsion in complex fluids when the head and tail are driven to rotate opposite each other about the rotational axis of symmetry.

This invention discloses an airflow and vibration-assisted electrochemical-shear rheology composite polishing device, comprising a worktable, a gantry frame, and a polishing assembly; the worktable and gantry frame form a frame; the polishing assembly is mounted on the frame and includes a workpiece clamping drive assembly and a polishing tank; each of the two side arms of the gantry frame has a slide rail, which slides in cooperation with the two ends of the worktable; a vibration device is mounted on the worktable; a set of nozzles is mounted on the polishing tank; an anode wire is mounted on the workpiece clamping drive assembly, and a cathode wire is mounted on the polishing tank. This airflow and vibration-assisted electrochemical-shear rheology composite polishing device has a specific structure that effectively prevents clogging at the blade root when polishing integral titanium alloy bladed disks, enabling efficient and uniform polishing of the integral titanium alloy bladed disks. Correspondingly, this invention also provides an airflow and vibration-assisted electrochemical-shear rheology composite polishing method.

A new acoustic technique, tensile acoustic rheometry (TAR) for performing rheology measurement of a soft viscoelastic material sample is provided. In TAR, an excitation acoustic pulse is applied using a focused ultrasound transducer to a sample material to induce oscillatory motion of the sample. To track this induced motion, high repetition frequency ultrasound pulse-echo technique is used using a co-linear, con-focal ultrasound transducer that detects the backscattered echo signal from a surface or an interface of the sample. The detection ultrasound transducer system converts the echo signals to an electrical signal, and a processor determines a displacement of the interface of the sample as a function of time. The processor also determines the spectrogram, or the frequency spectrum of the dynamic surface movement of the sample material as a function of the time. Viscoelastic properties of the material are then determined from the displacement and the spectrogram measurements.

Techniques for performing an acoustic rheology measurement of a sample are provided. A first set of acoustic pulses is provided by a focused ultrasound transducer to induce surface oscillations of the sample. A second set of acoustic pulses is provided by a detection transducer to interrogate the sample and detect the echo pulses reflected by the sample surface as a function of time. The detection ultrasound transducer system converts the echo signals to an electrical signal associated with the detected echo pulses, and a processor determines a dynamic displacement of the interface of the sample as a function of time. The processor also determines the spectrum, resonant surface oscillation frequency, and damping coefficient. Viscoelastic properties of the material are determined from these measurements, with applications for the characterization of the blood clotting process, the identification of a blood clot, gelation process, tumor, or fibrosis based on the viscoelastic properties.

The invention discloses an automatic integrated high-flux rheology testing device for a spinning solution. The automatic integrated high-flux rheology testing device comprises a mechanical arm, a rheology tester, a material replacement platform and a system, wherein the material replacement platform comprises four groups of test carrying tables and test carrying table racks, two groups of cleaning carrying tables and cleaning carrying table racks, and a cleaning liquid adding part; the rheology tester comprises a rotor; the test platform deck frame and the cleaning platform deck frame are respectively used for placing a test platform deck and a cleaning platform deck; the test platform deck comprises a mechanical arm clamping area, a positioning pin and a boss. The device can realize high-flux test work of different types of samples, and can realize 24-flux continuous test at one time.