Glass Conditioning Systems


The electric forehearth heating, also called forehearth boosting, is used to improve the glass quality / homogeneity. With specially designed molybdenum forehearth electrodes, the power will be inserted into the glass. For easier installation, the molybdenum electrodes are available with or without coating.


1 Molybdenum electrode
2 Adapter piece
3 Connection rod heat-resistant steel
4 Mechanical fixation
5 Electrical connection
6 Electrical insulation
7 Power cable

The forehearth electrodes are installed in the equalising section of the forehearth. A standard boosting installation consists of four electrodes per side / eight per forehearth, upon customers' request, other quantities are also possible. The electrodes have a diameter of 45 mm and the installation holes are cooled via air (cooling water is not necessary).

The boosting system consists of three main components:

  • Molybdenum (coated or without coating) incl. holder
  • Dry-Type Transformer
  • Control / power cabinet as stand-alone version or integrated into SCADA / PLC system

To avoid any magnetic field disturbances / power losses, the transformers are located as close as possible to the forehearth. Each transformer has two secondary coils (2x20kVA) and is built inside a closed housing.

The transformers are connected to a thyristor power controller which can steplessly control the power. The cabinet is considered to control the boosting via a SCADA / PLC system or to control it by manual mode. For each electrode pair, the current and voltage will be measured and indicated individually.

EQS boosting system recommendations from HORN®:

  • For glasses with low thermal conductivity (amber & green)
  • For multi gob production (TG / QG …) with high TH index requirement
  • For press & blow forming processes
  • For high flexible FH systems with a wide pull range and often job changes
  • Improve the TH index from existing FH installations with inadequate performance


HORN® standard EQS boosting system installation basics:

  • Real consumption is around 5 – 10 kW depending on operation conditions
  • Manual power or current control is possible
  • Extended versions with more electrodes for high pull FH’s are also possible
  • Later installation during hot operation is also possible in case of a need
  • Designed for normal furnace lifespan (lifespan >10 years is possible)
  • No change or push in during the normal operation required


Do you have any questions? Then please do not hesitate to contact us.