Simply put, the performance complexity of plastic raw materials determines the complexity of injection molding production process. The performance of plastic materials is due to different varieties, different injection molding production and processing conditions, different grades and even different batches. Different injection molding performance parameters will lead to different results.
injection mold processing factory
The influence of injection molding production time on molding process is manifested in three aspects
(1) Because of the shear characteristics of plastic melt, the viscosity of melt will be reduced, and the injection pressure required to fill the cavity will be continuously reduced.
(2) The injection pressure needed to fill the cavity should also be increased
(3) The greater the shear heating, the less heat dissipated by heat conduction, so the higher the melt temperature, the lower the viscosity, and the lower the injection pressure needed to fill the cavity.
Injection temperature is also a problem. The melt flows into the cooled cavity and loses heat due to heat conduction. At the same time, the heat generated by shearing may be more or less than that generated by heat conduction, which is caused by many factors, mainly depending on the injection molding conditions. In addition, the viscosity of melt decreases with the increase of temperature. Therefore, the higher the temperature in injection molding production, the lower the viscosity of the melt and the lower the required filling pressure.
