The third choice of hot runner feeding method of mold is "needle valve nozzle"
with the increasing popularization and application of hot runner technology, the proportion of hot runner mold in plastic mold will gradually increase. The application of hot runner vertical coordinate is an external stress technology, which has developed rapidly in foreign countries. DSM ecopax bio based 410 materials produced by many plastic mold factories use castor oil produced in India as raw material. More than 50% of the molds are made of hot runner technology, or even more than 80%, and the effect is very obvious. The hot runner has also been used for production in China, but the overall gap is less than 10%, which means that there is considerable market space in this industry
the wide application of hot runner technology is a major change in the rigid material mold for this part of consumer demand. In injection molding, it has many incomparable advantages. It can be said that with the further development and maturity of its technology and the reduction of manufacturing costs, hot runner technology will increasingly show its huge advantages. The key to the development of hot runner molds is to formulate national standards for hot runner components, actively produce low-cost and high-quality components, and do a good job in the publicity and promotion of hot runner technology
stop feeding 1 cut of liquid for the needle valve nozzle, the valve needle is controlled by mechanical pneumatic or hydraulic pressure, and the valve needle will close the gate at the end of pressure maintaining, that is, when the product is not fully condensed, the glue feeding system has been closed, which can also shorten the forming cycle. The needle valve nozzle can achieve no gate mark, but only leave a circle of marks or even no marks on the product surface, which is the best solution for strict surface requirements. It can provide enough gate size to reduce the shear heat and pressure loss, thus reducing the filling stress and providing an extremely abundant forming environment. It is also effective for extremely difficult to form plastics or very sensitive filling materials. At the same time, the feeding gate can be controlled in sequence. By extension, it can also achieve better product performance for all plastics, expand the injection volume and improve the injection speed, and avoid "wire drawing" for extremely "thin" plastics