The hot runner technology and developing direction of injection mold
The hot runner technology appeared in the 1950s, after decades of development, the current penetration of hot runner system in the injection mold industry is high, and it is effective especially in the processing of the complex and large plastic parts.
The hot runner technology uses a heating device to ensure that raw materials in the runner and gate remain the molten state. The hot runner technology is generally equipped with a heating device near the runner, and these heating devices can ensure that the entire runner is at a high temperature. At the same time, it can well maintain the molten state of raw materials. Compared with the cold runner system, the hot runner technology greatly improves the efficiency of the injection molding, and improves the product quality, reduces the waste of raw materials caused by the pre-cooling of the molten materials.
After decades of development of the hot runner system, a relatively mature set of machining and maintenance principles have been developed. However, under the premise of the rapid development of different industries, the requirements for products are becoming higher, and manufacturers have higher requirements for product quality and accuracy. As a technology that can effectively improve the accuracy and quality of molds, hot runner technology requires innovation from design specification, the standard of accessories, and temperature controls, and cooperates with precise injection machine to make qualified injection products.
The developing direction of the hot runner system in the future
1. Design specification. Increasing the accuracy of the hot runner system can improve the precision of the products, and with the support of multi-gate injection, can improve the efficiency of production and eliminates the defection.
2. The standards of accessories. Compared with cold runner molds, hot runners have more complicated spares and structures, which is more difficult to maintain. The standardization of accessories can shorten maintenance time and promote the popularization of the hot runner system in the injection mold industry.
3. Temperature control. At present, the heating temperature of the hot runner mold is difficult to control and brings more energy wastes in the injection process. To improve the accuracy of temperature control, the manufacturers can set the relative temperatures according to the certain material, to keep them in a molten state, and reduce the energy consumption caused by overheating, and at the same time, it will improve the quality of the product effectively.
