Effect of mold temperature: Appropriate mold tem […]
Effect of mold temperature: Appropriate mold temperature can ensure the melt flow and cool the product. Mold temperature represents the temperature of the mold cavity, not the temperature indicated on the mold temperature machine. Generally, the cavity temperature reaches a stable dynamic equilibrium during stable production and is higher than the indicated temperature of about 100 ℃. For large plastic molds, the mold must be fully heated (especially thin-walled and long-flow) before injection. Product molds should be more similar.
Effect of mold temperature: Mold temperature affects fluidity, which affects melt fluidity and cooling rate. It affects the flow rate, thus the cooling rate, and thus the appearance (surface quality, burrs) and injection pressure of the product, which in turn affects the crystallinity of the product. Product shrinkage and mechanical strength characteristics.
Due to the high mold temperature, good melt fluidity, high crystallinity of the plastic, large shrinkage of the product, small size, easy deformation of the product, long cooling time, low mold fluidity, poor melt fluidity, leading to assembly lines. Due to trace amounts, low crystallinity, and small shrinkage, their sizes increase.
For plastic injection molding, the mold temperature depends on the physical and chemical properties of the plastic, the fluidity and surface quality of the product. Generally, the mold temperature is set as high as possible to reduce the flow resistance of the melt and quickly fill the mold. The melt is cooled and solidified at a uniform rate. However, the higher the mold temperature, the smoother the surface, the more pronounced the depressions, and the longer the molding cycle. Therefore, the molding cycle and product prerequisites must be fully considered to determine the temperature.