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The forming process transforms the compact mass of the glass gobs into a hollow shape:
- The gob is transformed by pressing or blowing into an intermediate hollow pocket shape, with the opening fully formed.
- A mechanical arm then transfers this partially formed shape over to a finishing mould for blowing into the final shape of the bottle or jar. The finished glass object is then taken out of the finish mould by tongs and held briefly over a cooling plate, before being conveyed away.
The whole forming cycle only takes a few seconds.
To make the containers more resistant to scratches, they are treated with two surface coatings, one applied when they are still hot and again when they are cooled.
To ensure the solidity and stability of the formed glass containers, they then need to be cooled in a controlled way. This takes place within an ‘annealing lehr’, the process taking between 30 minutes and two hours.
Then every container made at Allied undergoes rigorous quality checks with a range of equipment, inspecting the neck area, dimensions, glass thickness and appearance.
Any container which is unacceptable is automatically rejected and returned to the furnace to be re-melted.