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What are the characteristics of hot runner system?

Date:2021-07-07View:705

The hot runner system is a combination. It includes a hot nozzle, a manifold, a thermostat, and a runner plate to form a hot runner system. As a common component of the injection mold system, it is heated to ensure that the plastics in the hot runner and gate adhere to the molten state. There is a heating rod and a heating ring near or in the center of the runner. The entire runner from the nozzle exit of the injection molding machine to the gate is in a high temperature state, so that the plastic in the runner will continue to melt, and it is generally not necessary to turn the runner to take out the condensate after shutdown. When starting the machine, you only need to heat the runner to the required temperature. Therefore, the hot runner process is sometimes referred to as a thermal header system, or as runnerless molding.


What are the characteristics of the hot runner system?


The characteristics of the hot runner system:


1. Plasticization


   means glass state, high elastic state (rubber state), viscous flow state (plasticized state), synthetic state:


  Glass state: 0~T1, the molecules are in a frozen state, hard and brittle, and easy to split under pressure.


  Viscous fluid state (plasticized state): T2~T3, can be processed and formed at will.


  Synthesis state: T3, the plastic begins to decompose, presenting a gaseous composition, and reaching a burnt state.


2. Activity


  In this kind of non-Newtonian activity, the pressure increases and the activity resistance decreases. Therefore, during injection molding, although the gate is quite narrow, it is easy to fill the mold cavity. As for the Newtonian fluid, there are two additional classifications:


  Injection molding is a processing method in which plastic solution is deformed at a high speed. Because the plastic solution is compact, it is easy to cause elastic pressure fluctuations under high-speed activities. This phenomenon, when the movement resistance changes rapidly, it can be seen that after this elastic pressure change occurs, the diffusion direction of the fluid front end is extremely turbulent and unstable. However, when high-speed filling is used, the plastic solution appears to be non-compacting.