The manufacturing process can be broken down into 8 stages
Sand, limestone and soda ash go into the composition of glass. These ingredients are then mixed with cullet (recycled glass) in very precise proportions to form the batch. The mixture is then fed into the furnace.
Our furnace heats the batch to around 1,500°C, producing molten glass. The now liquid glass travels through forehearths that deliver it to the machines at the temperature and viscosity required to shape the item. Glass takes about 24 hours to leave the furnace and be ready for forming.
On leaving the feeders, the glass is cut into gobs to supply the production machines. Sevam uses 3 moulding processes for forming, depending on the type of item:
After forming, where the items were cooled very abruptly, they are reheated and cooled gradually in an annealing lehr (around 570°C) to remove all stress and strengthen the glass
After annealing, the glass is inspected manually and/or by inspection machines so that only quality items pass, meeting international food contact and safety standards as well as Sevam customers' specifications. Glass rejected by inspection is fully reused as melting raw material.
The decoration technique used is screen printing. Ceramic enamels are applied to the item through a screen, then fired in a decorating lehr at around 580°C
At the end of the production line, packing groups, holds and protects the items to ensure transport, storage, identification and delivery in the best possible conditions.
Once on a pallet, the item is stored and then shipped to the end customer.
