Due to the construction of our new glass furnace, no guided tours are possible from 14.03.2019 to 28.04.2019.
Poschinger Glassworks since 1568
Poschinger produces glass items according to any customer wish and implements ideas from designers, companies, clubs and associations, as well as private individuals. Often, an idea offers enough of a basis to form the later object, though an exact description, sketch or drawing is always preferable. Alternatively, in the worst case, the remainder of a much loved item which has broken into pieces can be used to make a recreation.
A paper pattern is then crafted from a special type of cardboard. It forms the basis for every glass object, following on from the idea and initial sketches. If the customer’s draft design is available, a paper pattern is drawn and cut for the production of a wood or metal mould.
After creating the paper pattern, the mould turner carves or turns the wood mould from solid beech wood blocks. Later, the hot glass will be blown into this shape at a temperature 1,200 degrees Celsius.
The glassworks melts 15 different coloured glasses. Their recipes were created in house several centuries ago and have been constantly refined ever since. Canes, glass powders and frits of different grain sizes are used to create some 100 additional colours.
Show available colours (PDF)
Glass is made by teams of three to four glassmakers. First, the 1,200 degree viscous glass is taken from the end port of the glass furnace, shaped into a ball and blown into the mould after gathering over additional molten glass. At this stage, the glass cannot be too hot or too cold, as it would otherwise quickly drip off or solidify.
Immediately after its production, the glass has to be slowly warmed to the softening point and then cooled again. This relaxes all parts of the glass in equal measure. Depending on the type and size of the glass, the procedure on the cooling conveyor belt can take anything from one and a half to four hours.
The glass isn’t finished during cooling. There are usually further working steps to be taken care of. First, the glass cap is removed. This means scoring and heating the glass with a flame in a position where it is to be broken off, allowing the cap to be removed horizontally. After that, the rim is ground flat or melted.
Some glasses receive additional decoration after their production, and are, in other words, “refined” — ground, engraved, painted, printed on or sandblasted. Various refining techniques are carried out by hand depending on the customer’s desired decoration.
After the numerous work steps, the glass object undergoes one last check. If it is perfect, it is then signed, labelled and packaged before being shipped off to all corners of the globe.