What is a hot runner?

Hot runner mold technology is an advanced skill applied to the pouring channel system of plastic injection molds, and is a popular direction for the development of plastic injection molding processes. The so-called hot runner molding refers to the plastic that is sent from the nozzle of the injection machine to the gate always in a molten state, and does not need to be solidified and taken out as waste during each mold opening. The molten material remaining in the pouring system can be injected into the mold cavity during another injection.

The ideal injection molding system should form components with a common density, unaffected by all flow channels, flash edges, and gate nozzles. Compared to the cold runner, in order for the hot runner to achieve this, it is necessary to maintain the melting state of the data in the hot runner and not send it out with the formed part. The hot runner process is sometimes referred to as a hot manifold system, or as runner free molding. Basically, the thermal manifold can be regarded as an extension of the barrel and injection molding machine nozzle. The function of the hot runner system is to send data to each gate in the mold.

What are the advantages and disadvantages of hot runner skills?

What advantages can hot runner skills bring us? Friends who are familiar with injection molding technology know that conventional injection molding often presents the following unfavorable factors:

1. Difficulty in mold filling.

2. Deformation of thin-walled large parts.

3. Waste of raw materials for the runner.

4. The quality of injection molded parts in multi cavity molds varies.

The presentation of hot runner skills provides a relatively comprehensive solution to these problems. Generally speaking, using hot runners has the following advantages:

1. Save raw materials and reduce costs.

2. Shorten the molding cycle and improve machine power.

3. Improve the appearance quality and mechanical properties of products.

4. Point gates can be used without using a three plate mold.

5. Economically forming individual products with side gates.

6. Improve the level of automation.

7. The sealing of the gate can be controlled by a needle valve gate.

8. The quality of injection molded parts in multi cavity molds is common.

9. Evolve the appearance beauty of injection molded products.