Gate of mold runner system:

Also called the feed port. It is the narrow opening between the runner and the cavity, and it is also the shortest and thinner part. The function is to use the shrinkage of the flow surface to accelerate the plastic. The high shear rate can make the plastic good fluidity (due to the shear thinning characteristics of the plastic); the heating effect of the viscous heating also has the effect of increasing the material temperature and reducing the viscosity. After the molding is completed, the gate is the first to be cured and sealed, which has the function of preventing the plastic from reflowing and preventing the mold cavity pressure from falling too fast to cause the molded product to shrink and dent. After forming, it is convenient to cut to separate runner system and plastic parts.