Advantages of PVT testing

Determine the density, specific volume and compressibility of the tested material

Test the displacement of plunger and the change of material specific volume

Although the frame stiffness of the capillary rheometer is very high, the influence of the frame deformation (bending) on the test results is also corrected in the calculation

Correct the weight of the test sample after the test

Get Tait model coefficient

More definite displacement measurement accuracy

Very high reproducibility

Fully automated test

Through the study of the relationship between polymer PVT, the phenomena related to pressure, density, temperature, etc. in the process of injection molding can be obtained, the causes of defects such as warpage, shrinkage, bubbles and defect points in product processing can be analyzed, and the most appropriate process parameters can be formulated more quickly, so as to obtain high-quality products. Therefore, it is necessary to obtain more accurate and actual PVT data for more accurate prediction, evaluation, estimation, optimization and calculation.

In addition to the rheological data, the capillary rheometer can also obtain the relevant thermodynamic data through the study of PVT behavior.

Seal the outlet of the common test channel and add a certain weight of sample. The pressure of the melt is measured by the pressure sensor or the force value of the solid material is measured by the force sensor. Driving the test plunger to change the volume of the sample, heating or cooling to change the temperature of the sample, so that we can get the PVT scanning diagram. These data have very important guiding significance for the injection and other processing and molding processes.

Simulate the state of materials in processing machinery

Optimization of filling and additive process conditions

Process index of material processing, prevention of danger and troubleshooting

New PVT analysis structure

parameter

Pressure 0 ~ 2500bar (different according to model and configuration)

Isothermal mode:

Temperature range 0 ~ 450 ℃

Isobaric mode:

Temperature range: 0 ～ 380 ℃

Up to 25k/min cooling rate

The isothermal test process starts from room temperature, the material barrel is first heated to the melting temperature of the material, the filling material is then melted, and then slowly cooled to room temperature. Increase the pressure step by step, and then increase the pressure step by step at the next temperature

Isobaric experiment takes about 2/3 of the time of isothermal experiment