Quartz container glass
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The hollow glass shapes such as domes and tanks are most often blow molded.
The blowing of the glass is always carried out using a rod, on which the blower will deposit a mass of molten glass (parison). This mass is then worked during cooling to give the desired shape to the part. However, this technique is not used within the industry whose requirements of shapes and tolerances are more strict, and often reserved for artists.
The industry uses other processes such as blow molding. This process is used in the majority of non-flat glasses, such as food containers or any other so-called hollow glass. Several methods can then follow one another to produce a part.
The glass can be pressed: the molten glass falls into a mold and then a punch goes down to give shape to the piece. This process is limited to simple shapes. Then it is possible to add a blowing step to reach the desired final shape. It is pressing-blowing, which makes it possible to produce more complex shapes when a product of greater volume is sought.
It is also possible to rotate the mold during the glass blowing. This is called molding-blowing-rotation process. This guarantees a glass with thin and uniform walls, a process used in laboratory glassware for example.
More about other technical glass working methods:
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