The working principle of hot runner plastic mold is to guide molten plastic into the mold cavity through a heated runner system during injection molding, so as to realize efficient and accurate injection molding.

Its working principle includes the following steps:

1. Heating runner: The runner is heated by a heating element to keep the plastic in a molten state.

2. Plastic injection: injecting molten plastic into the hot runner system.

3. Flow control: Through the design and control of the runner, the plastic can flow evenly to each cavity.

4. Injection molding: plastic enters the cavity and is filled and molded.

5. Cooling and curing: the product is cooled and cured in the mold to form the final product.

The working principle of hot runner plastic mold has the following advantages:

1. Save raw materials: reduce the generation of gate waste.

2. Improve production efficiency: no need to clean the runner frequently.

3. Improve the quality of products: keep the molten state of plastics and improve the molding quality.

4. Reduce costs: save raw materials and production time.

However, hot runner molds also have some challenges, such as:

1. Higher cost: including the investment and maintenance expenses of the hot runner system.

2. High technical requirements: accurate temperature control and flow channel design are needed.

3. Trouble shooting: Once a problem occurs, the maintenance is more complicated.

In practical application, it is necessary to choose whether to use hot runner plastic mold according to product requirements and production conditions.