Plastic molds are common tools for producing plastic products, and many people want to know why it is necessary to heat the molds during the process.
First of all, mold temperature affects the appearance quality,shrinkage, injection cycle and deformation of the product. High or low mold temperature will have different effects on different materials. For thermoplastics, a high mold temperature will usually improve the appearance and flow, with the disadvantage of prolonging the cooling time and injection cycle, while a low mold temperature will affect the shrinkage of the product. For thermoset plastics, high mold temperature will reduce the cycle time. In addition, for plastic processing, high mold temperature will reduce the plasticizing time and cycle times.
Secondly, the benefits of mold heating are to ensure that the injection molded parts reach the specified temperature quickly.
Different plastic raw materials have different dissolution temperatures. When the mold is first installed, the mold is at room temperature, at which time the hot dissolved raw materials are injected into the mold, due to the large temperature difference, it is easy to cause defects such as filigree on the surface of the injection parts and large dimensional tolerances. Only after a period of injection molding, the temperature of the mold rises, and the production and production works will be normal. If the temperature of the mold does not get improved, then the produced ones are basically inferior.
The hot and cold change of weather will also affect the mold temperature. When the weather is hot, heating the mold, its temperature rises faster, when the weather is cold, it is slower. Therefore, we have to raise the mold temperature by mold heating tube, or preheat the mold before injection, as a way to ensure fast production of the mold.
It should be noted that the higher the mold temperature is, the better it is. If the temperature is too high, the products will not be easily taken out and some places will have sticky film phenomenon, so it is very important to control the mold temperature well.
The following is to introduce the role of the mold temperature machine.
Mold temperature machine is used to heat the mold and maintain its working temperature, to achieve the purpose of stable quality of injection molded parts and optimize processing time. In the injection molding industry, the temperature of the mold has a decisive role in the quality of the injection molded parts and the injection molding time. Therefore, the heat balance control of the mold temperature controller and the heat conduction of the mold is the key to produce injection molded parts. Inside the mold, the heat brought by the thermoplastic will be transferred to the mold steel through thermal radiation, and this heat will also be transferred to the heat conduction fluid through convection and to the mold frame through thermal radiation, and the role of the mold temperature controller is to absorb this heat.
Plastic mold is a common tool for producing plastic products, now you know why the mold should be heated!
Post time: Oct-12-2022
