The selection of industrial chillers in mould industry should pay attention to the following problems.
A mold is a heat exchanger, heat is introduced by molten plastic mold, mold by the continuous introduction of cooling medium -- ice water circulation in only a very small part of the template is pressed into the air and injection molding machine. Plastic molding cycles can sometimes account for more than 80% of the plastic molding cycle, so it is absolutely essential to minimize cooling time. For example, a mold forming cycle usually takes 20 seconds, such as cooling the water from the original cooling tower to the cold water produced by an industrial chiller, and it can be shortened to 16 seconds. Although the initial selection of chillers is much more expensive, it can increase production by 20% and yield great benefits in long-term production. So, how do you choose ice water energy?
If the mold with hot glue Road, should also be hot glue road energy added to the calculation of cold, the general hot glue road is kW as a unit, the calculation should be converted to units kcal / h, 1kw=860kcal / h. If the factory supply adequate water, low temperature, low cost, then you do not need to use the air filter, it is generally not too realistic, unless the plant can lower water temperature in the lake side; the other is the use of city deep water wells to meet the needs of temperature and flow, but the cost is too often high. This method can be used with experimental devices, but for factories, it is impractical to do so.
Mold cooling fluid (water) temperature is generally subject to the processing of materials and products shape changed greatly, such as polystyrene thin beaker, die ice water temperature at 0 DEG C; and in most cases, the mold required ice water in the temperature of 5 DEG C, a full function can provide the cold water of 5 DEG C the above water, low temperature cold water can meet the intelligent temperature below 5 DEG and 0 DEG C requirements.
The temperature difference of the ice water at the inlet and outlet of the mold is usually set according to the requirements of the product. In many cases, the temperature difference is 3-5 degrees centigrade, which is ideal, but sometimes the temperature difference is 1-2 degrees centigrade. The smaller the temperature, the greater the amount of ice water required to bring out the same amount of heat, and the less needed traffic.
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