Top-Hat Furnaces

These top-hat furnaces were specially developed for cooling complex structures or when the
process requires the treatment of warm glass, e.g., the welding process in glass apparatus manufacturing.
The wide-opening electro-hydraulically driven hood allows furnace opening
even at high temperatures and provides easy access from 3 sides.

• Tmax 1280 °C
• Very high temperature uniformity through 5-sides heating
• Multi-layer, high-quality insulation
• Heating elements mounted on support tubes for free heat radiation inside the furnace
• Electro-hydraulic drive of top-hat with non-flammable hydraulic fluid
• Bottom heating elements protected by SiC tiles
• Easy charging from 3 sides
• Table working height: 800 mm
• Hood safety switch
• Description of the control system see page 42

Additional equipment

• Manually or electrically operated interchangeable table system to shorten process times
• Customized dimensions
• Controlled fan cooling system: the preset cooling curve will be carried out exactly via variable fan speed
• Automatically driven vapour vent flaps
• Multi-zone control for optimal temperature distribution
• Completely automatic process control and documentation

For temperatures beyond 1350 °C we recommend furnaces with SiC rod heating.
The top-hat construction with 4-sides heating provides for exceptional temperature uniformity.

• Tmax of 1400 °C, 1450 °C or 1500 °C
• SiC rod heating on 4 sides of the furnace hood for short cycle times and high temperature uniformity
• High electrical connected power for short cycle times
• Hood insulation made from fibre materials provides for short cycle time and low energy consumption
• Table built from lightweight refractory bricks allows for heavy loads and level stacking surface
• Electro-hydraulic driven hood for vibration-free opening and closing of furnace hood
• Thyristor powered heating
• Description of the control system see page 42