Forming Glass Containers; Temperature, Thermal Exchange And Viscosity

This article discusses moulds, different forming processes, and glass temperature and behaviour. Forming glass containers involves the use of blank and blow moulds, with which heat is removed from the glass, along with diverse processes such as blow-blow, press-blow, NNPB, which give the final items their correct shape. The temperature of the glass inside the mouth lowers considerably due to its contact with the plunger. If the plunger remains in the glass too long it can cause stress on the mouth. The neck ring mould must be suitably amortized and be able to avoid possible oscillations of the parison, without touching the upper surfaces of the blow mould.