Temperature control of plastic mold processing injection molding
Plastic mold processing In the injection molding, temperature control occupies a very important part, it can decide whether the product is good or bad. If you make it to the customer, you will lose the trust and cause of the customer. The company’s losses, said to be small, it’s okay to do it again, these are not, but you have to remember that these are actually wasting the company’s resources.
1. Tube temperature: The temperature to be controlled during the injection molding process includes barrel temperature, nozzle temperature and mold temperature. The first two temperatures primarily affect the plasticization and flow of the plastic, while the latter temperature primarily affects the flow and cooling of the plastic. Each plastic has a different flow temperature. The same plastic has different flow and decomposition temperatures due to different sources or grades. This is due to the difference in average molecular weight and molecular weight distribution. Plastics are injected in different types. The plasticizing process in the machine is also different, so the temperature of the selected cylinder is also different.
2. Mouth temperature: The nozzle temperature is usually slightly lower than the temperature at the top of the barrel. This is to prevent the "flowing phenomenon" that may occur in the straight-through nozzle. The nozzle temperature should not be too low, otherwise it will cause early condensation of the melt and block the nozzle*, or affect the performance of the product due to the injection of the early aggregate into the cavity.
3. Mold temperature: The mold temperature has a great influence on the intrinsic properties and apparent quality of the product. The temperature of the mold depends on the presence or absence of crystallinity of the plastic, the size and structure of the product, performance requirements, and other process conditions (melt temperature, injection speed and injection pressure, molding cycle, etc.).