The runner cone must be equipped with cooling water channels to prevent premature cracking.
The sprue bushing should have a cooling ring for cooling. There are two methods to fix the cooling ring: welding and hot pressing.
The cooling of the inner mold must ensure the following data: the diameter of the water channel is generally 8-10mm.
The height of the water channel from the lowest surface of the product: Aluminum alloy: 25-30mm.
Zinc alloy: 15-20mm.
If the inner mold water channel must exit through the mold frame, a high-temperature and high-pressure resistant waterproof ring must be used.