Improve the appearance of the product

It uses the system to heat the injection material and precise temperature control means to pass the molten plastic material through the precision The designed runner, the hot nozzle is directly delivered to the mold cavity, effectively reducing the pressure of the runner (so a smaller injection molding machine can be used to save costs), the fluidity of the melt is improved, the material density is uniform, and the internal stress of the product is reduced Small, make the product get smaller deformation, better product surface quality and mechanical properties, for transparent parts, thin parts, large parts or plastic parts with special requirements (such as engineering plastic parts) can show its superiority.　　4, provide more molding process parameters, which can accurately control product quality.　　 Compared with the traditional cold runner, it has the following advantages: 　　1, shorten the molding cycle, greatly improve the production efficiency.　　 In general, the use of hot runner system in the injection process can save 10%-20% of raw materials, reduce costs by about 30%, and increase investment by only 10%-30%.. Generally divided into two categories: open type and needle valve type. Therefore, the hot runner system has been widely used abroad, and it has also been used as one of the popularization technologies for future injection mold development in China.　　3, to ensure the dimensional accuracy of the hot runner and the matching tolerance with the mold to prevent leakage of glue. Another feature of the hot runner system is that the hot nozzle directly injects the molten plastic material into the mold cavity, which naturally forms an automatic glue break during the demolding process, eliminating all or most of the runner waste caused by the traditional injection process , No post-processing is required, and a lot of materials are saved.　　2, the runner is processing of plastic products highly smooth and has no dead ends, ensuring rapid color change, preventing material degradation and improving efficiency.　　Second, the role of hot runner: 　　The hot runner system is a new and scientific injection molding system. The air pressure or oil pressure that controls the valve needle movement is appropriate.　　The hot runner system is a precise and complex injection molding system. In addition to matching accuracy, the main factors that determine the quality of the hot runner system are many other key factors, as follows: 　　1, accurately control the plastic temperature to prevent material degradation.　　6, the choice of hot nozzle is scientific and reasonable to ensure the smooth flow of plastic and the full filling of the cavity. In addition, because the additional heat caused by waste is eliminated, the cooling time of the mold is only the cooling time of the plastic part, which shortens the molding cycle and improves the automation and production efficiency of production , More importantly, the saving of materials and energy is of greater significance to the protection of the environment. It is composed of three parts: hot nozzle, manifold and temperature controller. It directly reaches the mold cavity from the barrel nozzle by heating the plastic in the runner and keeping it in a molten state. If the pressure is too small, the valve needle will not move or move in place. The working principle of the hot runner system: 　　The hot runner system is mainly composed of a manifold, a hot nozzle and a temperature control box.　　6, the product has no nozzle material, which greatly reduces the production cost.　　5, through a special design, it can form small pitch multi-cavity products and low pressure injection molding.　　7.　　3, reduce the stress of plastic parts, reduce deformation, and greatly improve product consistency.1. If the pressure is too high, it is easy to damage the hot nozzle and the mold.
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4, the valve needle closes and opens in time, flexible action to prevent drooling at the glue inlet.　　2, reduce the injection pressure and clamping force, greatly improving the life of the mold.　　8, using needle valve hot nozzle, step-by-step injection molding, it can form difficult precision plastic products.　　7, to improve the appearance of the product and greatly improve the quality of the product. 　　5, balanced and reasonable design of runners to ensure uniform and rapid filling of each cavity