Text|Hot constant heat flow path
From the literal meaning, the difference between the cold runner and the hot runner surface lies in the cold and heat. The cold runner is the basic form of the injection mold! The so-called cold runner is a conventional injection mold. After the injection is finished, there is a conglomerate in the flow path that needs to be taken out! The taken out can not be reused, and it has become a waste heat flow channel to solve the problem of resource waste and cost saving. At the same time, it has achieved relatively large results in the injection molding process. The hot runner has gradually developed into the general direction of the development of injection molds, and will surely be popularized! Due to cost accounting problems, there are many small and medium molds that have not yet applied hot runners! There is still a small amount of material that must be (better controlled) applied to cold runner mold injection!
So now there are cold runners and hot runners in the injection mold industry! Dongguan Huangjiang hot runner manufacturers to answer, what is the hot runner?
The hot runner is heated to ensure that the plastics of the runners and gates remain molten. Since the heating rod and the heating ring are arranged near or in the center of the flow path, the entire flow path from the nozzle exit of the injection molding machine to the gate is in a high temperature state, so that the plastic in the flow path is kept molten, and it is generally unnecessary to open the flow path to take out the condensation after the shutdown. Material, just turn on the flow channel to the required temperature. Therefore, hot runner processes are sometimes referred to as hot manifold systems, or as no runner molding. So what are the advantages of hot runners?
Save raw materials and reduce costs;
Shorten the molding cycle and improve machine efficiency;
Improve the surface quality and mechanical properties of the product;
Do not use a three-plate mold to use a point gate;
Economically forming a single article with a side gate;
Increase the level of automation;
The gate can be controlled by a needle valve gate;
The quality of the injection molded parts of the multi-cavity mold is consistent;
Improve the surface appearance of injection molded products;
However, each technology has its own shortcomings, and hot runner technology is no exception:
The mold structure is complex, the cost is high, and the maintenance cost is high;
It takes a while for the boot to be stable, resulting in more scraps.
When there is melt leakage and heating element failure, it has a great influence on product quality and production schedule;
With the reduction of resources, market competition, and raw material prices have risen sharply, it is very necessary to make a fuss about the issue of saving materials! This is also an important reason for the hot runner! It can be said that it is an inevitable outcome of the development of social industrialization!
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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