KH 214 Heating-cooling band, special ceramic for intensive air cooling

Application areas:

Heating and intensive air cooling of extruder cylinders.

Intensive cylinder air cooling enables a considerable reduction of the melt temperature whereby material degradation due to temperatures being too high is avoided, melt stiffness at the tool outlet is increased and the cooling requirements for downstream equipment can be reduced.

This makes higher throughput performances and better product qualities possible.

Construction/version types:

• Heating conductor coils fitted in special ceramic bricks with temperature-resistant braid connection.
• Cooling fins formed on the rear for increasing the heat exchange surface which the cooling air flows past. This results in a 2,5-fold increase of cooling surface related to the stone contact surface on the cylinder.
• The contact surface of the stone to the cylinder is shaped so that two contact lines for improved heat transmission resultat any cylinder diameter.
• The ceramic bricks consist of a special oxide ceramic with a high thermal conductivity of 16-28 W/mK (standard ceramic heater band: 2-3 W/mK) therefore enable a considerably higher heat dissipation than conventional versions.
• A completely flexible heater band can be produced using the concave and convex-shaped end surfaces of the special ceramic bricks, and this can be simply placed around the cylinder and is therefore extremely quick to fit.
• Fixing is made using two stainless steel tensioning ropes with clamping screw and compression springs. The system enables high clamping forces, and therefore guarantees a permanently positive contact, and therefore ensures optimum heat transfer.
• The complete elimination of additional cooling fins (radiators) made of brass or copper prevents the occurrence of scaling or oxidation.
• With respect to the heater band width, centrally positioned sensor holes are possible.
• Reduced energy consumption.
• The simple, modular design enables short delivery times.

Also available in UL/CSA certified version on request.

Technical specification:

Voltage: according to specification
Heating capacity: max. 7 W/cm²
Height: 21 mm, incl. cooling fan
Available widths: 30 mm, 48 mm, 63 mm
Diameter: from 60 mm

Complete, available with housing as heating-cooling assembly HK 214.

Electrical Test Data

according to DIN EN 60204-1 (VDE 0113-1)
Dielectric strength: 1000 V AC
Insulation resistance: cold ≥ 1 MOhm at 500 V DC

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.