Because in the melt index test, only the temperature is a dynamic parameter, so the impact on the test results is also very large, so we must specify the technical parameters of the temperature in the test process.
1. Temperature accuracy.
Melt index test accuracy, where the difference between the exponential value and the standard thermometer. In general, as long as the temperature control system has long-term stability and small fluctuations, the accuracy can be corrected to eliminate the error. Usually (according to ISO standards, ) is required to be within 0.5 °C.
2. Temperature fluctuation
Temperature fluctuation refers to the temperature fluctuation of the equipment after feeding or not, and the temperature is stable. This characterizes the temperature control capability of the equipment.
3. Long-term temperature stability
Melt index test stability refers to the value of temperature change after a long period of time, such as 4h, whether it is fed or not in the barrel. It characterizes the temperature control system's ability to resist environmental temperature changes, resist power supply voltage changes, and itself. The drift of the electronic system. Usually not required to exceed 1 °C.
4. Temperature Distribution
Specifically, it refers to the temperature gradient within the length of 50mm from the upper end of the die in the barrel, reflecting the uniformity of the temperature inside the barrel. It is usually required not to exceed ±1.5 °C at the top of the temperature and ±1 °C at the bottom
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