Preparation of a mould for operation

Before an HR mould commences operation, the following preparations are needed connection and checking of the mould temperature regulation system  

When HR moulds commence operation, the following actions are performed in seqnence  

The system must not be purged at high pressure with the mould open, as this carries the 

When thermally sensitive plastics are being processed, e.g., PBT, PET, POM, and nozzles with an insulation chamber are being used, the HR system may first be filled with a thermally stable plastic, e.g., PA 66. This prevents a distribution of melt which hangs in the chamber or creates what is known as an insulating layer. 

For the first 15 minutes of operation a watch should be kept over whether there are any melt leaks in the manifold space. Leaks may be indicated by shorts (incomplete filling of the mould) with a previously set specific batching capacity, a fall in injection pressure or gases escaping from the manifold space, etc. 

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