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How to Choose a Mold Temperature Controller Machine?

Aug. 24, 2020

At present, more and more plastic products manufacturers have deeply realized the importance of using a mold temperature controller machine to control the temperature of the mold for the molding of plastic products. If the selected mold temperature controller machine matches the temperature requirement of product molding, it can greatly improve the quality of the product and reduce the production cost of the product. So how to choose a mold temperature controller machine that matches your needs? With the intensification of market competition, plastic manufacturers are paying more and more attention to this problem. What kind of mold temperature machine is needed for humidity control at each stage of product molding? What are the advantages and disadvantages of high-performance mold temperature controllers? According to the similarities of mold temperature controllers, compare the mold temperature controllers sold by different factories in the market. It is not difficult for us to classify them into several series. The classification standards are: heat conduction medium, temperature control range, internal structure, cooling method, etc. The combination of the above standards plays a key role in selecting a mold temperature machine.


1. Recognize the advantages and disadvantages of the mold temperature controller:


      There is no doubt that comprehensive economic and technological considerations, we can find a mold temperature machine that matches your needs in the market. But in fact, how to choose from a variety of brands and series is not an easy task. In addition to considering the cost, we must first understand: the timeliness of product supply, the quality of after-sales service, whether the machine can be expanded, and so on. In fact, the most important thing for you is to obtain the technical parameters of the mold temperature machine that suits your needs, so as to measure the usability for you.


Thermal conductivity as the first standard


      First, decide whether to use heat transfer oil or water. Within the allowable temperature control range, based on the good thermal conductivity of water, the water type is preferred.


1. Water mold temperature controller


When the temperature requirement of the mold does not exceed 95°C, the mold temperature machine works in a non-closed mode; when it is higher than 95°C, a closed working mode must be selected to ensure a certain pressure inside the system and avoid the evaporation of the heat transfer medium.


When the mold is at a high temperature, for example, in the injection molding process of thermoplastic materials, accurate and rapid heat conduction is necessary. This is a concern for products with high precision requirements. Based on the limitation of the internal space of the hot runner of general models, the hot-water mold temperature machine is more suitable than the oil-type mold temperature machine. When the temperature reaches 200 and the pressure is 16Bar, the superiority of the water-type mold temperature machine becomes more prominent.


The temperature control range of the water mold temperature machine is: 5~200.


2. Oil type mold temperature controller


The temperature control range of the oil-type mold temperature machine is 45~350.


The temperature of the non-closed oil mold temperature controller can reach up to 200 degrees. Considering that some heat transfer media will undergo pyrolysis at 200°C. Therefore, the pyrolysis reaction humidity of the heat transfer medium selected by this series of mold temperature controllers should be higher than 200 , so as to prevent the pyrolysis reaction from locking the decomposed carbon to the surface of the heating medium, which reduces the thermal conductivity of the medium and ultimately makes the mold The humidity cannot be well controlled.


Because oil is prone to pyrolysis reaction at high temperature, safety measures should be taken to avoid pyrolysis reaction when the oil temperature is higher than 200. If necessary, check the flow rate of the heat transfer medium. If the flow rate is too low, the system should have automatic Shutdown function.


In addition, the oxidation problem of the heat transfer medium should be avoided. The oxidation reaction will increase the viscosity of the medium and reduce the thermal conductivity of the medium, which will also affect the temperature control of the mold. Therefore, when pouring oil into the oil tank, the oil must be poured slowly and the temperature of the medium should be kept at about 100°C.


Cooling method, second selection criterion


When choosing a machine, you also need to pay attention to the cooling method of the heat transfer medium. There are two types of cooling methods, direct and indirect. The indirect cooling method uses the cooling circuit to be separated from the main circuit. The heat transfer medium used in this cooling method is generally oil type. The heat of the cooling medium is absorbed by the heat medium and directly enters the exchange valve. The indirect cooling method is only used on the oil-type mold temperature machine. Because the cooling capacity of this cooling method is not strong, the cooling water must be clean when using this cooling method to prevent impurities from clogging the pipeline and affecting the temperature control performance of the machine.


Advantages of direct cooling:


The disadvantage of indirect cooling: heat will be lost in the heat exchanger. Therefore, when the actual temperature of the medium deviates greatly from the set value, we adopt the direct cooling method with greater cooling capacity. When using the direct cooling method, the cooling water enters the circuit directly without the need for a heat exchanger. Adopting this cooling method can greatly improve the cooling capacity of the system, and then the heat transfer medium can be quickly cooled down. It can use electric valve or multi-stage solenoid valve control to increase the control accuracy of the system. The prerequisite for using the direct cooling method is: a closed circuit; clean water is required for the heat transfer medium.

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