It may be important to control the temperature in the injection molding process. Sometimes the temperature difference will lead to defective mold. Therefore, the temperature control in the injection molding process can be an important factor in the injection molding process.
Injection molding process
1. Barrel temperature: the temperature required to be controlled in the injection molding process includes barrel temperature, nozzle temperature, mold temperature, etc. The first two temperatures mainly affect the plasticization and activity of plastics, and the second temperature mainly affects the activity and cooling of plastics. Each kind of plastic has different activity temperature. For the same kind of plastic, the activity temperature and synthesis temperature are different due to different sources or brands. This is due to the difference of uniform molecular weight and molecular weight distribution. The plasticization process of plastic in different types of injection machines is also different, so the selection of barrel temperature is also different.
2. Nozzle temperature: the nozzle temperature is usually slightly lower than the maximum temperature of the barrel, which is to avoid the "salivation phenomenon" that may occur when the melt is in the straight nozzle. The temperature of the nozzle should not be too low, otherwise the early setting of the melt will be formed and the nozzle will be blocked, or the performance of the product will be affected by the early setting material injected into the mold cavity.
3. Mold temperature: mold temperature has a great influence on the internal performance and apparent quality of products. The temperature of the mold depends on the crystallinity of the plastic, the size and structure of the product, performance requirements, and other process conditions (melt temperature, injection speed, injection pressure, molding cycle, etc.).
Because of the different molds, the temperature control is very important.
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