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Selection of Hot Runner Nozzle

Hot Runner parts require very clean, as far as possible to avoid further processing. Hot runner nozzle generally bolted for easy replacement. Needle-type nozzle with only the surface of the product leaving the ejection lever similar traces, is an effective method with a surface for decorative products. In addition it can reduce stress, shorten cycle times and adapt to a variety of processing raw materials (including the larger containing abrasive materials and heat-sensitive materials).

Torpedo head core has the following advantages:

1. Temperature is easy to control, and tear off automatically make the polymer in the nozzle.2. For the first torpedo core material (such as PA, PC) is easy to produce a good drawing can form tear-off effect.

Disadvantages of torpedo head core material is that they cause the shearing action. Shear sensitive material, the core and the flow path in the torpedo annular gap, and a chamfer at the torpedo core because strong shearing damage. If the material is difficult to machine parts made torpedo core chamfer can lead to blot. Colored polymer, due to toner aggregation has occurred, are particularly difficult to machine. Regardless of the material is non-crystalline, or crystalline thermoplastic elastomer, all injection method has certain limitations on certain materials.

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