Characteristics of hot runner system
First, the advantages of the hot runner system:
1. Save plastic raw materials: There is no production waste because there is no cold runner in the pure hot runner mold. This is particularly significant for applications where plastic is expensive. In fact, the major hot runner manufacturers in the world have developed rapidly in the era when the world's oil and plastic raw materials were expensive. Because hot runner technology is an effective way to reduce materials and materials costs.
Characteristics of hot runner system:
(1) Plasticization: glass state, high elastic state (rubber state), viscous fluid state (plastic state), and decomposition state.
Glass state: 0 ～ T1, the molecules are in the frozen state, hard and brittle, and easy to break under pressure.
Viscous fluid state (plasticized state): T2 ～ T3, can be processed at will.
Decomposition state: T3, the plastic begins to crack, gas decomposition products appear, and even reach a charred state.
(2) Forming conditions: After the product is formed by the hot runner mold, it is finished. There is no need to trim gates and recycle cold runner. Conducive to production automation. Many foreign product manufacturers have combined hot runner and automation to greatly increase production efficiency.
Molding cycle: Because there is no restriction on the cooling time of the runner system, the product can be ejected in time after it is solidified. Many thin-walled parts produced with hot runner molds can be molded in less than 5 seconds.
Expanded application: Many advanced plastic molding processes are developed based on hot runner technology. Such as PET pre-molding, multi-color co-injection in the mold, multi-material co-injection process, STACK MOLD, etc.