Temperature conditions that need to be paid attention to in the plastic injection
What should be paid attention to during the plastic injection? Probably many people don't understand, the following is a list for your reference.
The temperature that needs to be controlled in the plastic injection includes the barrel temperature, nozzle temperature and mold temperature. The first two temperatures mainly affect the plasticization and flow of the plastic, while the latter temperature mainly affects the flow and cooling of the plastic. Each plastic has a different flow temperature. For the same plastic, due to different sources or grades, its flow temperature and decomposition temperature are different. This is due to the difference in average molecular weight and molecular weight distribution. The plasticization process in the machine is also different, so the temperature of the barrel is also different.
The nozzle temperature is usually slightly lower than the maximum temperature of the barrel. This is to prevent the "salivation" that may occur in the straight-through nozzle of the melt. The temperature of the nozzle should not be too low, otherwise it will cause the premature solidification of the melt and block the nozzle, or the performance of the product will be affected due to the premature solidification of the material injected into the cavity.
The mold temperature has a great influence on the internal performance and apparent quality of the product. 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 and injection pressure, molding cycle, etc.).