Successful Exploitation of Temperature Controller

Began in Jan. 2010, the temperature controller in Shini Hot Runner Business has successfully realized the independent exploitation and manufactured the ones with different zones from 1 to 30. Up to Sep. 2010, we have sold 28 temperature controllers with different zones from 1 to 6 with the assistance of Shini Corporation and her agents.

Working together with suppliers, Hot Runner Business has exploited the one-zone with two-point temperature control card and is applied to temperature controllers with 56 points and 106 points. Both two controllers are now successfully applied to the injection molds with 48-cavity for the medicine bottle and 96-cavity for the battery cup, and the precision of temperature control is ±0.5℃.

 Picture: Temperature controller

Temperature controller is used to measure temperature and maintain setting value. The typical temperature control loop is following:

Picture: Temperature Controlling

X: Adjustable designated value W: Settable given value Y: Single indicator
1. Flow channel 2. Heater tube 3. Thermocouple 4. Adjustor
5. Setting unit of adjustor

Working principle of temperature controller:
Displayed as the form of electric voltage, the single from thermocouple is related to temperature and signed as X”. After Comparing X” with W”, the adjustor will transport the value compared which is referred to as Y” to the setting unit, and then the temperature control loop can be finished. As a fully conversion, temperature detected by thermocouple is proportion to power of heater.
Accurate temperature controlling is not only based on the adjustor, but it is determined by the following factors as well:
• Difference in temperature between measuring point and hot runner.
• Survey tolerance of thermocouple.
• Error caused by thermocouple wire.
• Characteristics of the setting unit: range of proportion signed as Xp, time of integration signed as Ti, time of deviation signed as Td.
• Influence of input voltage.
• Melt plastic change in temperature.
• Change of mold and surroundings in temperature.