Special HR Mould Designs

Adapted injection moulding machines, for example, with a greater platen spacing, and process equipment to take the optimised new moulds are also being designed. 

The nozzle ends were adapted to the shape of the moulding. The manifold is equipped with 11 temperature regulation circuits. To compensate for the thermal expansion in a large manifold, nozzles set in intermediate blocks were used in this design. 

As may be seen from the examples given, in many large moulds with deeply shaped cavities it is essential to nse various types of very long nozzle. Elongated central nozzles are used in cases where the moulding ejection system is located in the fixed mould half. 

It should be pointed out that the steel ends with tip and nose are also set in copper/beryllium bushings. The flow channel diameter may be between 8 and 20 mm, depending on the result of rheological simulation. 

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Various types of heater are used, depending on the requirements made of individual HR system elements and their design (see Chapter 4). They are manufactured and made available by specialist firms or by the manufacturers of standard mould bases with special recommendations for their installation and use. 

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