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Electric heating technology...
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Cartridge heaters...
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Our cartridge heaters serve the purpose of direct heating of tools or tool components. The most frequent application areas of heating cartridges include: moulds, tools, heating bars and various mechanical parts, for example in the plastics processing and packaging industry.
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High performance
cartridge heater HLP
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The high-performance cartridge heater (HLP) has emerged as standard heater with a variety of application areas in the past few decades. The advantage of the HLP is its design with a particularly small distance from the heating conductor winding to the outer sheath and the excellent resulting heat transfer. This design enables surface loads of 30 W/cm².
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High density Spiral cartridge heater HPV
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A compacted spiral cartridge heater HPV constitutes a design compromise between a high-performance heating cartridge and an uncompacted heating cartridge. Spiralised heating conductors are run through a hole ceramic for this design. It is particularly suitable for applications which do not require high surface loads, i.e. a maximum of 12 W/cm².
This extremely robust heater can also be manufactured with long lengths
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Spiral cartridge heater
HPu
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These cartridge heaters mainly differ from the heaters described above due to their uncompacted design. Here, the heating conductor is embedded in magnesium oxide (MgO), which is highly electric heat conductive. You can implement surface loads of up to 5 W/cm² with this cost-efficient heater.
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Cylinder heaters...
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Our cylinder heaters from the type series ZHB (micanite version) and KHB (ceramic version) serve the purpose of direct heating of tools, moulds and cylinders from almost all sectors of industry. Apart from their variable connection options (connection fitting with or without built-in box as well as a connection line) these heating bands are characterised by user-friendly fastening options, which enables quick and trouble-free replacement
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Cylinder heater ZHB
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- Customer-specific design
- Maximum temperature: 350°C
- Minimum diameter: 35mm
- Minimum heating band height: 20mm
- Maximum heating band height: 800mm
- Heating power: 5.0 W/cm²
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Cylinder heater
ceramic version KHB
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- Customer-specific design
- Maximum temperature: 650°C
- Minimum diameter: 60mm
- Minimum heating band height: 21mm
- Maximum heating band height: optional
- Heating power: 9.0 W/cm2
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Frame - and Panel heaters...
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Our frame and panel heaters of the type series KHK / FHK (micanite version) serve the purpose of direct heating of tools and moulds for plastics processing machines and other process-engineering applications. Apart from the variable design and the different connection options these heating elements are characterised by dimensional stability as well as corrosion resistance. A short heating-up time is ensured due to the low mass of heating elements.
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Frameheater
KHK
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- Maximum temperature: 350°C
- Maximum performance: 3.5 W/cm² optionally up to 5.0 W/cm²
- Heating element: micanite version
- Connection voltage: 230 Volt AC, 400 volt 3ph
- Installation size: according to customer specifications
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Panelheater
FHK
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- Maximum temperature: 350 °C
- Maximum performance: 3,5 W/cm² optional bis 5,0 W/cm²
- Heating element: micanite version
- Connection Voltage: 230 Volt AC, 400 Volt 3ph
- Installation size: according to customer specifications
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Tubular heaters RHK...
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Our tubular heaters have a diameter of 6.5mm and 8.5mm and consist of high-alloyed chromium-nickel steel. The current-carrying, spiral-wound heating conductor is made of high-temperature-resistant chromium-nickel resistance wire. This heating conductor is centrically embedded and insulated inside the jacket pipe. Fine-grained magnesium oxide characterised by its particularly good heat conductivity and excellent insulation values even in case of high temperatures is used for insulation. The heat element ends are unheated and sealed as well as locked with a ceramic end bead according to their intended purpose. The surface load of the tubular heaters in W/cm² depends on the intended purpose. Therefore, the performance and dimensions of all tubular heaters have to be designed according to their intended purpose.
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Screwable immersion heaters EHK...
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Our screw-in heaters of the type series EHK (versions 1 1/2” and 2”) serve the purpose of direct heating of different liquid and gaseous media.
Areas of application:
- Domestic water heating
- Continuous flow heaters
- Oil heating
- Cleaning baths
- Degreasing baths
- Air heaters
Optimum adjustment of the heating elements to the medium and the desired operating temperature is possible. Moreover, we also provide versions with temperature controllers, temperature limiters and a controller-limiter-combination. The versions with a performance of up to 11.0kW are directly wired for switching; separate contactors in a control cabinet are not required.
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Spiral pipe cartridge heaters / coil heaters WRP...
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All Coil heaters by Gräff are also available with a built in thermocouple.
The standard built in thermocouple is a Fe-CuNi Type J.
Moreover, the version can also be supplied with a thermocouple Ni-CrNi Type K at short notice.
Standard version spiral pipe cartridges by Gräff are equipped with a nickel-plated copper litz wire and PTFE-insulated.
Litz wire length 1000mm.
Other connection types can be supplied at short notice at customer request.
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Electric heating technology...
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