Injection Molding Machine Industry How to Choose the Right Chiller?

Although the chiller is very useful in all walks of life, but it is the most widely used in the mold and injection molding industry, the chiller is necessary for most plastic mold manufacturers, facing customers, the most asked question is how to match their plastic mold with the right chiller, then this article will answer all the questions.

1. How to choose a chiller

In fact, a mold for the chiller is a heat exchanger, the heat from the melting plastic into the mold, and then from the mold into the continuous circulation of the cooling medium – frozen water, and the plastic molding cycle, a considerable amount of time for cooling, sometimes accounting for more than 80% of the plastic molding cycle, so the cooling time control to a minimum is absolutely necessary. So, how to ensure the cooling speed of frozen water?

The cooling speed of the industrial chiller is related to the specific heat capacity of the molding material, the temperature when melting, the weight and the temperature when the product is demould.

General injection molding mold cooling, the pressure of frozen water choose 0.1-0.2mpa, can meet the requirements, and our industrial cold water function to meet this requirement, when the pressure requirement is higher than 0.2Mpa, need to be planned separately, to facilitate the use of the corresponding pressure pump to meet the needs of the system water supply.

2. The chilled water flow of industrial chiller

The chilled water flow required by a plastic mold is directly related to the heat to be taken away by the mold and the temperature difference between the chilled water and the mold. And there's a formula for calculating that heat.

So here we take an example, if we want to take 15,000kcal /h heat away from the mold, if the temperature difference is 5 ° C, then what is the minimum flow required? Chilled water flow Q=15000÷5÷60=50(l/min), that is, choose a machine with a water flow of 50(l/min).

3. Select based on the chilled water temperature

The temperature of the frozen water is generally subject to the shape of the processed materials and products and has a great change, such as thin-walled products with special materials, the mold requires the temperature of the frozen water to be below 0℃; In most other cases, the temperature of the frozen water required by the mold is above 5 ° C, our industrial cold water machine provides cold water above 5 ° C, and there are customized low temperature chiller to meet the requirements of below 5 ° C and below 0 ° C.

The temperature difference of chilled water at the import and export of plastic molds is often set according to the requirements of the product, in many cases, the temperature difference is the most ideal when the temperature difference is 3-5 ° C, but sometimes the temperature difference is also required at 1-2 ° C. The smaller the temperature difference, it means that the same heat is taken out, the greater the flow of cold water is needed, and the smaller the flow is needed, we can choose the right chiller according to the temperature and efficiency of their needs.

4. Insulation of chilled water pipes

Cold water pipes must be insulated, especially in the hot season to do a good job of insulation measures, because pipe insulation can not only prevent the serious loss of cold capacity, but also prevent the formation of dew on the outer wall of the pipe, so as to improve refrigeration efficiency and reduce customer losses.