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Select the preform mold to start from know the hot runner nozzle
Aug 03, 2017

What is the effect of the hot runner nozzle selection? I am slightly aware of the following: product weight,plastic raw materials, mold, cycle time, gates, nozzles, flow channel, hot runner temperature controllers and Performance of injection molding machines and so on. When we have a very accurate understanding of these, we can choose the appropriate hot runner nozzle.

Here's a brief introduction to those elements:

1.The weight of the product

The weight of the product on the hot runner requirements are completely different.

2.Plastic raw materials

Different German plastic raw materials have different processing variables, and those processing variables will affect the choice of hot runner system.


How much is the number of cavities? What is the distance of the nozzle? What kind of material is it processed? Etc. These are the mold elements associated with the optional hot runner system.

4.Cycle time

The rapid production cycle means an increase in nozzle requirements. For example, the nozzle to accurately transfer heat, but also to be durable.


For point gates, the hot runner tip must have the function of melting material and cooling sealing in order to maintain good heat balance during each molding cycle. While the valve gate is a mechanical way to seal the gate.


The nozzles are generally distinguishable by size, temperature distribution, physical properties, materials used (copper, steel, etc.) and ease of maintenance and price.

7.Flow channel

The use of the hot runner system avoids the production of raw materials, thus saving the raw materials and at the same time eliminating the need for manual, manipulator or other means to remove the material.

8.Hot runner temperature control

Each nozzle must be connected to a relatively complex hot runner temperature controller.

hot runner controller.jpg

9.Performance of injection molding machine

Able to install a given size of the mold, to provide adequate clamping force, according to the requirements of the cycle time to operate, plastic enough materials and so on.

10.Product design

In general, we all know that the product design is completed first, but the final shape is done in the hot runner mold. In order to ensure that the end of the formation of a smooth product appearance, easy to mold, the product structure must be considered in the design of those factors.

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