The uneven temperature of the wire drawing mold is related to the injection cycle. After injection, the temperature of the mold cavity rises to the highest. At this time, the hot melt hits the cold wall of the mold cavity, and the temperature drops to the minimum after the part is removed. The function of the mold temperature machine is to keep the temperature constant between θ2min and θ2max, which means to prevent the temperature difference Δθw from fluctuating up and down during the production process or gap.