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| Composition of Hot runner system |
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Composition of Hot runner system
1. Hot runner plate: The main function is to carry the molten bath thermostatically from the main runner to each single nozzle, during the bath carrying process, the stress of the bath needs to be reduced as little as possible, and the materials is not allowed to be degraded.
The normal used hot runner plates styles are: “1” type, “H” type, “Y” type, “X” type. Structurally, there are two kinds: outer-heating hot runner plate and inner-heating hot runner plate.
2. Nozzle: The hot runner molds are in many kinds according to the different nozzle structures, but these kinds are quite similar。 The hot runner systems are different in quality and price, due to the process crafts and using ways are different. Normally there are open type, pin valve type, and other special types.
The technology of pin valve nozzle is advanced, the merits are:
a. There is no gate vestige on the parts, the gate is very smooth.
b. The gate in larger diameter can be used, which can make the cavities quickly be filled, and the injection stress can be decreased further to avoid the parts deformed.
c. The fusible link and casting can be prevented when opening mold.
d. When the mold injection machine screw brad is back, the materials can be prevented efficiently from absorbing to the cavities.
e. It can match the sequential control system to reduce the parts welting mark.
3. The spare heaters are the main part composed of the hot runner system. The heating precision and life time influences the control of the mold injection and the stable work of the hot runner system. Normally there are heating rod, heat coil, tube heater and spiral heater etc.
4. Temperature controller is the instrument controlling the temperature of each part in the hot runner system. From bottom to top, there are on-off set and PID control set (proportional-differential ferential control set), new smart control set, etc. The internal other components can be matched to use according to the customer’s request. |
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