Temperature control in the injection moulding process

⒈ barrel temperature: injection moulds in the moulding process need to control the temperature of the barrel temperature, nozzle temperature and mould temperature and so on. The first two temperatures mainly affect the plasticisation 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. The same plastic has different flow and decomposition temperatures due to different sources or grades, which is due to different average molecular weights and molecular weight distributions, and the plasticisation process in different types of injection machines is also different, so the choice of barrel temperature is also different.

2.Nozzle temperature: The nozzle temperature is usually slightly lower than the maximum barrel temperature, to prevent possible "salivation" of the melt in the straight-through nozzle. Nozzle temperature should not be too low, otherwise it will cause early condensation of the melt and block the nozzle, or due to early condensation of the material into the cavity and affect the performance of the product.

3.The temperature of the mould: the temperature of the mould has a great influence on the intrinsic properties and apparent quality of the product. The temperature of the mould is determined by the crystallinity of the plastic, the size and structure of the product, the performance requirements, and other process conditions (melt temperature, injection speed and pressure, moulding cycle, etc.).