Heat balance control of Air Cooler Mould heat conduction between injection moulding machine and mould is the key to produce injection moulded parts. Inside the mould, the heat brought by plastic (such as thermoplastic) is transferred to the material and the steel of the mould by heat radiation, and transferred to the heat conducting fluid by convection. In addition, the heat is transferred to the atmosphere and the mould base through thermal radiation. Heat absorbed by the heat conducting fluid is taken away by the mould temperature machine.

The mould temperature machine is composed of water tank, heating and cooling system, power transmission system, liquid level control system, temperature sensor, injection port and other devices. Usually, the pump in the power transmission system makes the hot fluid reach the air cooler mould from the water tank with built-in heater and cooler, and then return to the water tank from the mould; The temperature sensor measures the temperature of the hot fluid and transmits the data to the controller of the control part; The controller adjusts the temperature of the hot fluid, thereby indirectly adjusting the temperature of the air cooler mould. If the temperature of the plastic injection mould exceeds the set value of the controller during the production of the mould temperature machine, the controller will open the electromagnetic valve and connect the water inlet pipe until the temperature of the hot fluid, that is, the temperature of the mould returns to the set value. If the temperature of the air cooler mould is lower than the set value, the controller will turn on the heater.

The types of mould temperature machines are classified according to the heat conducting fluid (water or heat conducting oil) used. Usually, the outlet temperature of the mould temperature machine with water transport is 95℃. The oil-transporting mould temperature machine is used for occasions with working temperature ≥150℃. Usually, the mould temperature machine with open water tank is suitable for water temperature machine or oil temperature machine, and the outlet temperature is 90℃ to 150℃. The main characteristics of this mould temperature machine are simple design and economical price. On the basis of this machine, a machine using high temperature water temperature is derived, and its allowable outlet temperature is 160℃ or higher. When the temperature is higher than 90℃, the thermal conductivity of water is much better than that of oil at the same temperature, so this machine has outstanding high temperature working ability.

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