Container forming
In the feeder (Fig. 6.1) the molten glass is extruded through an orifice of known diameter at a predetermined rate and is cropped into a solid cylindrical shape. The cylinder of glass is known in the trade as a gob is allowed to free-fall through a series of deflectors into the forming machine , also known as the IS or individual section machine, where it enters the parison. The parison comprises a neck finish mould and a parisonmould, mounted in aninverted position. The parison is formedby either pressing or blowing the gob to the shape of the parisonmould. The parison is then reinverted, placed into the final mould and blown out to the shape of the final mould, form where it emerges at a temperature of approximately 650◦C (1200◦F). A container is said to have been produced by either the press and blow or blow and blow process(Fig 6.2).