With the continuous improvement of injection molding technology and people's pursuit of high-precision plastic products, the traditional cold runner molds can not meet the demand and can not meet the precision requirements of modern products. Over the past 30 years, injection molders have succeeded in processing materials for a variety of different applications, from general-purpose resins to engineering resins, with the unparalleled technical advantages of hot runner systems. The reason why the popularity of hot runner technology in China is not high is due to various reasons. The hot runner, that is, the melt in the mold casting system during the injection molding process is always in a molten state, does not solidify, does not produce a cast aggregate, and does not have to clean the gate mold system after molding the product. In China, the real promotion of this technology is just something that has happened in recent years. The use of the hot runner not only air cooler mould makes the product more beautiful, the raw material is saved, the production efficiency is higher, and the service life of the mold can be increased by at least 5 times. With the development of the polymer industry, hot runner technology is constantly improving and accelerating its use. Most customers still hold a wait-and-see attitude toward this technology.. In the 1990s, hot runner molds in US injection molds accounted for More than 40%, in large-scale product injection molds, the proportion of hot runners is as high as 90% or more. In the mid-1980s, hot runner molds in the United States accounted for 15% to 17% of the total number of injection molds, Japan was about 10%, and Europe was 12% to 15%. The mold determines the quality of the product to a large extent. At present, DME companies in the United States and MOLD-MASTERS in Canada are rushing to introduce new hot runner systems. As some European and American companies came to China to purchase molds, the hot runner technology was gradually promoted in China. Gate quality is becoming increasingly important as customers' aesthetic requirements for products improve. At the same time, market competition has led to a drop in product prices, prompting injection molders to improve product quality while performing faster color change, all of which determine the customer's broad demand for hot runners
