With the growing popularization and application of hot runner technology, the proportion of hot runner molds in the plastic mold will gradually increase. The application of hot runner technology rapid development in foreign countries, many plastic mold factory produced more than 50% of the mold hot runner technology, even more than 80%, the effect is very obvious. Hot runner in the country has also been used in the production of less than 10%, but overall, the gap is huge, which means that this industry has considerable market space exists. Hot runner technology, widely used is a major change in the plastic mold. In injection molding, which has a considerable number of incomparable advantages, we can say, hot runner technology will become increasingly apparent with the further development of its technical maturity and lower manufacturing costs, a huge advantage. Development of national standards of the hot runner components, positive production of inexpensive high-quality components, do the hot runner technology promotion is the key to the development of hot-runner mold. Close the gate by mechanical pneumatic or hydraulic control valve needle in the last paragraph of packing on the valve needle in the needle valve mouth, which means that the product has not yet completely frozen into the dispensing system is turned off, and this is to shorten the molding cycle. The mouth of the needle valve can do no gate marks, but only in the surface of the product left the circle imprinted or no, which is applied to the surface of demanding the best solution. It provides a large enough gate

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