The hot runner system is divided into adiabatic runner and micro semi hot runner system. The design of adiabatic runner is complex, but the effect is good and the maintenance cost is very low. The micro semi hot runner is simple in structure, stable and easy to use, with low failure rate. Because of its simple structure, the maintenance cost is low, which ensures the stability of production.
Hot runner classification: open type (for micro semi hot runner), needle valve type (for insulated runner).
The open structure is simple, suitable for micro semi hot runner, not suitable for insulated runner. The insulated runner has high limitations on materials, and is directly in contact with the product surface, prone to wiredrawing and leakage, with poor surface quality; The micro semi hot runner does not contact the product but the micro runner, so the open hot nozzle can be used, which is widely used in high-precision molds abroad.
Needle valve type:
Needle valve hot runner saves materials, the surface of plastic parts is beautiful, and the internal quality is compact and the strength is high. There are two categories in the world:
Needle valve hot runner (according to the injection principle): cylinder type and spring type. The cylinder type pressure controller and timing controller control the cylinder to push the needle valve to close. The structure is complex, but the design is simple
The cylinder type die has high precision because of its structural characteristics. At the same time, the commissioning and maintenance are complex. The mold-master is called the Rolls Royce in the hot runner - the heating part is on the nozzle. A large part of their cost is in debugging and maintenance, and the customer can hardly maintain it by himself.
The spring type features that the needle valve switch is controlled by the balance of spring and injection pressure. The assembly, commissioning and maintenance are simple, and the mold accuracy is not high. Domestic customers basically have their own maintenance ability, and are widely used in household appliances, automotive accessories and precision multi cavity molds. The difference between the spring type and the cylinder is that the timing control is not available, and the problem of weld lines cannot be well solved. On the basis of successfully summing up the experience of thousands of sets of hot runner systems, the technical personnel of plastic beauty have successfully developed: small diameter wear-resistant nozzle; Spring needle valve and internal heating nozzle. Sumei hot runner has developed an embedded heater. The heater is directly embedded in the copper sleeve. Because the copper has good thermal conductivity, the copper embedded heater is sleeved on the hot nozzle, which greatly reduces the maintenance cost and price positioning of the hot nozzle of the hot runner
Article source: Zhongshan heating pipe http://www.gdtamman.com
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