Raw Material Glass

The production of glass bodies from viscous glass liquid


Within the process of blowing air into the melted glass, at first only a small amount of the material is taken with an about 2 metres long iron tube called “glass-producing pipe” (in German “Glasmacherpfeife”). This glass liquid is formed to a small ball, called “Kölbel”, by the change of blowing air into the pipe, rolling and turning the ball on an iron underground. Afterwards, the person using the glass-producing pipe blows air into the ball and blows it up. After cooling down the ball at the end of the pipe, as much glass as necessary for the production of the final item is taken with this “Kölbel”.


Pipes or tubes up to a length of 50 millimetres are produced by pulling the material. Here, the same preparational steps of work are necessary as in the process described above. The only difference is that the melted glass is formed by pulling it slowly to the requested length.


In the process of pressing the glass, the melted material is picked up with an iron tool called “Nabeleisen”,filled into a form consisting of a hallmarking part, a lower part and a circular connecting part and squeezed out later on. After cooling down to the solid condition, the material gets ist final shape.


There is also the method of spinning the melted material. This way, the glass is filled into a form which is put into rotation.
By centrifugal forces, the liquid material is distributed to the walls of the form. The glass gets its final shape during the cooling-down process.