SU911224A1 - Device for thermoplast melt rheological property determination - Google Patents

Description

- , , -one

The invention relates to the determination of fluid properties, in the rheological properties of polymeric materials, and can be used in plastics processing in the chemical and other industries.

A device for determining the rheological properties of a melt of thermoplastics is known, comprising a cylindrical chamber with a known internal cross-sectional area and a piston. one.

However, when using this device to determine the rheological properties of melts having air or other inclusions, measurement error appears.

The closest to the proposed technical essence and the achieved result is a device for determining the rheological properties of a melt of thermoplastics, containing a heat chamber with a capillary, a piston.

Ignition fluid cut-off, piston speed sensor, in the numerator of the thermoplastic melt rheological properties, on the Data collector and on the G2 recorder.

However, when studying thermoplastics with a known device, it is necessary to control the quality of the extruded melt by visually inspecting the jet or determining the percentage content of the filler in the polymer being forced, otherwise the measurement accuracy on this device is not high.

The purpose of the invention is to improve the accuracy of measurements.

The goal is achieved by the fact that a device for determining the rheological properties of a melt of thermoplastics, containing a heat chamber with

Claims (2)

A capillary tube and a piston disposed therein, a knife for cutting the extruded material, a displacement speed sensor, and a piston associated with the calculator. The 391 rheological properties of the thermoplastic melt, which is connected to the data accumulator and the recorder connected to it, additionally contains an extruded mass mass meter and a mass transducer connected to it, comparing the discriminator of the measured zone and the unit of the extruded material, is located under the capillary, the output of the mass converter is connected to the first input of the comparing unit, the output of which is connected to the first input of the discriminator of the measured zone, and to the second input g The measured zone criminator is connected to the zone controller, while the output, the flow calculator rheological properties of the thermoplastic melt is connected to the BTopfatM input of the comparing unit, and the discriminator output of the measured zone is connected to the data accumulator. The drawing shows the functional diagram of the device. The device consists of a heat chamber 1, a piston 2, a capillary 3, a knife k for cutting out the extruded material, an extruded material mass meter 5, a mass converter 6, a piston speed sensor 7, a thermoplastic melt calculator 8, thermoplastics data 9, compared unit 10, discriminator 11 of the measured zone, unit 12 of the zone, recorder 13 of the melt AND of the material under study, part of the material 15 received on the mass meter. The device works as follows. In the heat chamber 1, the material under study is melted and the melt obtained is thermostatted. Under the influence of the force applied to the piston 2, the latter moves downward and squeezes through the capillary 3 a portion of the melt 5, which is formed by the knife k and is fed to the meter 5 of the mass of the extruded material. Moving the rocker arms and measuring the mass causes a change in the output signal of the mass converter 6. The speed of movement of the piston 2 is measured by the sensor 7 of the speed of movement, the piston and from the output of the sensor is introduced into the calculator 8 of the melt flow properties of thermoplastics. The signal from the output of the calculator 8 of the rheological properties of the thermoplastic melt simultaneously enters the data collector 9 and the comparison unit 10. The output signal of the mass converter 6 is input to another input of the comparison unit 10. The resulting signal of the comparing unit 10, which is the difference of the input signals, is input into the discriminator 11 of the measured zone, to another input of which comes from the unit 12 of the zone the signal of the boundaries of the measured zone specified by the operator c. depending on the properties of the polymer. In the case when the resulting signal of the comparing unit 10 goes beyond the boundaries of a given zone, a prohibition signal appears at the output of the discriminator 11 of the measured zone, which is fed to the control input of the E data, resulting in invalid data being automatically excluded from the measurements. The proposed device makes it possible to measure with a high degree of accuracy the environmental properties of a polymer by automatically eliminating unreliable data obtained by pressing the melt from the filler or as a result of air or other inclusions in the jet of the melt. Apparatus of the Invention A device for determining the rheological properties of a melt of thermoplastics, comprising a heat chamber with capillaries and a piston located therein, a knife for cutting the extruded material, a piston speed sensor connected to a calculator of the rheological properties of a melt of thermoplastics, which is connected to the data accumulator and connected to It is registered with it, characterized in that, in order to improve the measurement accuracy, it additionally contains a mass meter of the extruded material and connected to it a mass analyzer comparing the block, the discriminator of the measured zone and the zone setter, the mass meter of the extruded material is located under: the capillary, the output of the mass transducer is connected to the first input of the equating unit, the output of which is connected to the first Input of the discriminator of the measured zone, and to the second input the discriminator of the measured zone is connected to the zone controller, while the output of the calculator of the rheological properties of the melt of thermoplastics is connected to the second input of the comparison unit, and the output of the discriminator of the measured zone is connected to the data collector. Sources of information taken into account in the examination , Operating Instructions for the device Schmelz-lndex-PrUfger8t Mt 21, b of the firm G6ttfort-Felnwerk Technlk GmbH, Germany. 2. Priboriiyrt-A. TU 5I1 550.022 (prototype). ff