Author: MULAN –Plastic Molding Manufacturer
Plastic mold processing and injection molding take up a very important part of temperature control. It can determine whether the product is good or bad. In a big way, even if you hand it over to the customer, you will lose the customer's trust in you and cause The loss of the company, to put it bluntly, it doesn’t matter if it’s a big deal to redo, these are unnecessary, but you have to remember that these are actually a waste of the company’s resources. 1. Barrel temperature: The temperature that needs to be controlled in the injection molding process includes barrel temperature, nozzle temperature and mold temperature. The first two temperatures mainly affect the plasticization and flow of plastics, while the latter temperature mainly affects the flow and cooling of plastics.
Each plastic has a different flow temperature. The same plastic has different flow temperature and decomposition temperature due to different sources or grades. This is due to the difference in average molecular weight and molecular weight distribution. Plastics in different types of injection The plasticizing process in the machine is also different, so the selection of barrel temperature is also different. 2. Nozzle temperature: The nozzle temperature is usually slightly lower than the top temperature of the barrel, which is to prevent the "salivation phenomenon" that may occur in the straight-through nozzle. The temperature of the nozzle should not be too low, otherwise it will cause premature solidification of the molten material and block the nozzle, or affect the performance of the product due to the injection of early solidification material into the mold cavity.
3. Mold temperature: Mold temperature has a great influence on the internal performance and apparent quality of the product. The temperature of the mold depends on the presence or absence of plastic crystallinity, the size and structure of the product, performance requirements, and other process conditions (melt temperature, injection speed and pressure, molding cycle, etc.).