Three main points of temperature control in plastic barrel processing

- Apr 02, 2020-

1. Cylinder temperature: The temperature that needs to be controlled in the process of plastic barrels includes barrel temperature, nozzle temperature and mold temperature. The first two temperatures mainly affect the plasticization and flow of plastics, while the latter two temperatures mainly affect the flow and cooling of plastics.

Each plastic has a different flow temperature. The same type of plastic has different flow temperature and decomposition temperature due to different sources or brands. This is due to the difference in average molecular weight and molecular weight distribution. Plastics are used in different types of injection machines The plasticizing process inside is also different, so the temperature of the selected cylinder is also different.

2. Nozzle temperature: The temperature of the nozzle of the plastic barrel is usually slightly lower than the high temperature of the barrel. This is to prevent the "salvation phenomenon" of the molten material in the straight-through nozzle.

The temperature of the nozzle should not be too low, otherwise it will cause the early setting of the melt and block the nozzle, or the performance of the product will be affected because the early setting material is injected into the mold cavity.

3. Temperature: The mold temperature has a great influence on the internal performance and apparent quality of the product.

The temperature of the plastic barrel mold depends on the plastic crystallinity, product size and structure, performance requirements, and other process conditions (melt temperature, injection speed and injection pressure, molding cycle, etc.).