Design Procedure of TZM Hot Runner Nozzle

TZM (Titanium-Zirconium-Molybdenum Alloy) hot runner system generally includes nozzle, manifold, thermal chamber, accessories and so on. There are two kinds of nozzle: open hazzle and valve nozzle. The design procedure of TZM hot runner nozzle includes eight following steps:

1.0 The position of feed inlet is determined according to the plastic part structure and operation requirements. The feed inlet can be placed at every position of the plastic part if the structure of the plastic part allows and the nozzle and nozzle head in the fixed insert are not intervened by the structure. 

2.0 To determine the form of nozzle in the hot runner system. The key factors of selecting nozzle form are the materials of plastic parts and the operation properties of products. The batches of plastic parts production and the production cost of molds are the important factor of selecting the nozzle form. 

3.0 To determine the cavity of plastic part according to the production batches and the tonnage of the injection devices.

4.0 To decide the number of nozzles according to the determined position of feel inlet and the cavity of the mold. 

5.0 The radial size of nozzle depends on the weight of mold and the number of nozzles.

6.0 The size of mold structure can be determined by the structure of plastic parts. An then the size of standard nozzle should be selected according to the fixed insert and the thickness of fixed template.

7.0 hot manifold retaining plate

The shape of the hot retaining plate is determined according to the shape of the hot manifold. The lead groove is arranged on the plate, and a sufficient cooling water loop is designed near the hot runner plate, the nozzle, and the nozzle head.

8.0 To complete the design of the plastic molds of the hot runner system.

The finished TZM hot runner nozzle system must consider the degree of cooperation between the hot runner system and the plastic mold, that is the design of the hot half.

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