Hot runner system characteristics

1. Advantages of hot runner system:

Saving plastic raw materials. In pure hot runner molds, there is no production waste because there is no cold runner. This is particularly important for applications where plastics are expensive. In fact, major international hot runner manufacturers have achieved rapid development in the era when oil and plastic raw materials are expensive. This is because hot runner technology is an effective way to reduce material costs.

2. Characteristics of hot runner system:

(1) Plasticization: that is, glass state, high elastic state (rubber state), viscous flow state (plasticized state), decomposition state;

Glass state: 0~T1, the molecules are in a frozen state, hard and brittle, and easily broken when under pressure;

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

Decomposition state: T3, the plastic begins to crack, gas decomposition products appear, and even reaches a burnt state.

(2) Forming conditions: The part is a finished product after being formed by the hot runner mold, and there is no need to trim the gate and recycle the cold runner. It is conducive to production automation. Many international product manufacturers have combined hot runners with automation to significantly improve production efficiency.

Molding Cycle: Because there are no cooling time constraints associated with the runner system, parts can be ejected immediately after solidification. Many thin-walled parts produced with hot runner molds can achieve a molding cycle of less than 5 seconds.

Expanding Applications: Many advanced plastic molding processes have been developed based on hot runner system technology. Examples include PET preform production, multi-color co-injection, and multi-material co-injection within the mold.