HK 218 Heating-cooling assembly, thermally insulated version with optimised accessibility

Application areas:

Heating/cooling of extruder cylinders.

Construction/version types:

Special ceramic heating-cooling bands of type KH 214 in widths of 30 mm, 48 mm and 63 mm are mounted directly on the cylinder in regular intervals. In cases of increased cooling requirements the flexible aluminium cooling elements KE 300 (widths 34 mm, 47 mm, 60 mm) can be mounted between the heater bands. A stencil supplied makes alignment of the heater bands/cooling elements in the corresponding cylinder zone much easier.

In the next stage the connection flange for the cooling fan with terminal box is fitted to the cylinder using stable round facing plates. This flange includes specially-shaped air deflectors for distribution of the cooling air in the axial and tangential directions and the electrical connection with ceramic-terminalblock or industrial plug connection are also integrated. A power-supply cable of a defined length can be supplied. The size of the air outlet opening is matched to the corresponding flow volume of the intended fan, and is fitted with a grille structure for optimum airflow.

The two vertically divided double-walled shrouds filled with a 25 mm thick insulating filler are then bolted to the side flanks of the fan flange housing. In the upper area they include the ECOWEMA® flap system KSHK for reduction of heat loss. Supplementary sheet metal covers can be supplied to increase the safety against being burned. These covers can be made of aluminium eloxated material in the colours red or blue. Sensor bores and apertures will be considered as far as technically possible. This construction guarantees optimum accessibility to the installed ceramic heater bands, which enables simple replacement of the heater bands without having to carry out complete dismantling of the heating-cooling assembly.
In this manner, a (retrospective) conversion to a higher heating performance is made simple through the installation of further KH 214 flexible special ceramic heater bands or to a higher cooling performance through the installation of flexible aluminium cooling elements KE 300.

Also available in UL/CSA certified version on request.

Technical specification:

Mat. housing: 0,8 mm aluminised sheet steel (stainless steel on request)
Voltage/tie-in: according to specification
Heating capacity: max. 7 W/cm², related to the heater bands
Operating Temperature heating element _max.: 500 °C
Diameter: from 100 mm
Width: from 150 mm
Wall thickness: ~ 60 mm (incl. thermal insulation)

Electrical Test Data

Power tolerance: ± 5%  

Unless otherwise specified, our heating elements are rated IP30.
Special versions with a higher degree of protection can be manufactured upon request.