All the glass used by Sternfenster in its windows doors and conservatories is 4 or 6mm-float glass.
The glass sizes are calculated by computer and fed through to an automatic cutting table that takes sheets of glass 3.5 metres square and cuts the sheet into the required sizes to an optimiser programme.
The glass is paired up and together with a label is sent to the automatic glass line.
At this stage the spacer bar is cut and filled with desiccant. The purpose of the desiccant is to remove any moisture present in the air when the unit is sealed, as moist air conducts more heat and cold than dry air.
The bars are formed into squares the edges are sealed with butyl, and the spacer is placed on a conveyor system to marry up with the glass.
The glass is placed at the beginning of the line and proceeds through first the washer this cleans the glass. As it passes through the washer an intense light is shone behind the glass to show any imperfections, dirty glass is put through again or if scratched replaced.
As it emerges from the washer the spacer is placed onto the first pane of glass, it enters the press and the second piece follows through.
Upon the second piece entering the press and registering onto the first piece the press then applies a uniform hydraulic pressure amounting to several tons per square inch and sandwiches the two pieces of glass onto the butyl edge seal.
The unit then moves on to the sealing table, whereupon it is sealed all round the perimeter using a hot molten butyl sealant. This sealant enables the unit to be handled immediately as the material cools very quickly.
The completed unit is then sent through to the factory for glazing or in some cases sent on special pallets loose to customers for them to glaze themselves.
For further information please visit:
