Rheological measurement apparatus and measurement method with flow rate accurately controlled

Abstract

The invention discloses a rheological measurement apparatus and a measurement method with flow rate accurately controlled. A second and a third pressure sensors are successively arranged on a die head of a measurement module in the flowing direction of a melt polymer at interval. Sufficient material is guaranteed to be supplied to a second gear pump by changing the rotation speed of a first gear pump, and the inlet pressure and the outlet pressure of the second gear pump tend to be equal so as to ensure that the first gear pump can accurately control and meter the material entering the measurement module; in the same way, by changing the rotational speed of a fourth gear pump, the material flowing out from the measurement module can be accurately controlled and metered by means of a third gear pump; when the rotational speeds of the first and the second gear pumps are equal, the material is ensured to flow through the module head as stable as possible by accurately controlling and metering the flow rate, wherein the pressure sensors in the measurement module are capable of detecting the pressure drop in little fluctuation when the material passes through the module head; and accurate relative rheological properties are obtained by the accurate flow rate and the stable and accurate pressure drop.

Description

technical field [0001] The invention relates to the field of polymer rheology testing, in particular to a rheological measuring device and a measuring method for accurately controlling flow. Background technique [0002] Due to the large test error, the off-line test cannot reflect the actual production process, which greatly limits its application range. In recent years, tandem online rheometers have been used more in research fields and industrial production. However, the series online rheometer needs to be installed in the main channel of the production machinery, which has an impact on the production process. Compared with offline rheometers and serial online rheometers, the device of the present invention can be installed in polymer processing equipment to monitor the rheological properties of processed materials in real time during the production process, and obtain relevant rheological parameters at the first time; real-time Change the production process, reduce the...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of offline rheometers and series online rheometers in industrial production, provide a rheological measurement device and measurement method for accurately controlling the flow rate, and solve the problem that the current industry cannot accurately control the metering flow rate online Then it is a technical problem to accurately measure the rheological properties online and return the measured materials to the production equipment

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