Distributors and forehearth systems
SORG has supplied more than 1000 distributors and forehearths since the glass conditioning department was founded in 1976.
Gas heated distributors and forehearths
Most of these installations are gas heated and the current generation is called the ST Series, comprising STW distributors and STF forehearths.
The series was introduced in 1999.
ST Series distributors and forehearths illustrate our flexible approach to system design, in that all three types of cooling – open radiation, direct air and indirect air – are used where and when each is best applicable, thus allowing the advantages of each system to be utilised and the disadvantages to be minimised.
All ST Series installations utilise the well-known SORG VMC high pressure gas heating system, which we introduced in 1993.
A typical SORG STW distributor has direct air cooling in the middle zone and open radiation cooling in the outer zones, whilst an STF forehearth will normally have open radiation cooling in the rear cooling zone and indirect air cooling in the middle zone. However, the flexible approach to the use of the three cooling systems means that some installations utilise different combinations of cooling systems.
Most of our all-electric forehearths use electrodes immersed in the glass bath, but in the case of some glasses it is necessary to use radiant heating elements located above the glass bath.
Electrodes are suitable for coloured soda-lime glasses, fluoride opal glass, C glass for insulating fibre and Pyrex®-type borosilicate glass. Indirect electrical heating is generally used for high quality glasses, including flint soda-lime compositions.
These forehearths are similar to standard gas heated installations with the exception of the gas heating system, where special equipment and burners are required.
Forehearths for special applications
Our various forehearth technologies can be combined in many ways to produce forehearths for special applications. These included covered forehearths for glasses with easily volatile components, and these forehearths can be heated either directly with electrodes, or indirectly with gas or with electric radiant heating elements, or even using a combination of direct and indirect heating. We can also supply forehearth colouring systems.