Since any one deviation for temperature, load, machine parts, will lead to incorrect test results, therefore, in order to ensure the validity of the test results, it must be specifically determined by these parameters.
Temperature
Since the melt flow rate of the experiments, only the temperature is a dynamic parameter value, to a great impact test results, so the temperature parameter value specified very carefully. Some manufacturers of various instruments (as well as the bath, Vicat softening point, etc.) where temperature indicators are marked "control accuracy" This one, in fact, is to provide users with a seemingly high accuracy and actually is moot indicators.
1 Temperature Accuracy Matters
Accuracy, the difference between the index value and the standard thermometer was between Here, in general, as long as the melt flow rate instrument temperature control system having a long―term stability and slight fluctuations, the accuracy is can be eliminated by correcting the error . General (according to national standards, the same below) requires within 0.5 ℃.
2. Temperature fluctuation
It refers to whether or not the addition of temperature fluctuations inside the barrel, temperature fluctuations after the temperature stable, which characterizes the temperature control device.
3 . temperature for a long time stability
Whether or not the cartridge feeding means, after a long period of time, after such 4h, temperature conversion value, he characterizes the temperature control system of the ambient temperature change, resistance to the power supply voltage conversion, as well as their drift electronic systems generally require no than 1 ℃
4. Temperature distribution
Especially on the barrel die Reach a temperature gradient within the range of 50mm length, reflecting the barrel temperature uniformity. General requirements for high temperature does not exceed ± 1.5 ℃, the low-end does not exceed ± 1 ℃.
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