KH 214 Heating-cooling Band, Special Ceramic, for intensive Air Cooling
2 - 3 weeks
Application areas:
Heating and intensive cooling of extruder cylinders.
Intensive cylinder 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.
Complete, available with housing casing as heating-cooling combination HK 214, HK 216 or HK 218.
Construction/version types:
Heating conductor coils fitted in special ceramic stones
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 bearing 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 stones 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 stones, 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 special ceramic stones have an extremely high
fracture strength, which ensures a long heater band
service life. This makes frequent assembly and disassembly
possible without problems.
The special ceramic heater bands are extremely suitable
for use under high cylinder temperatures (e.g. during
the processing of fluorine polymers with a processing
temperature of more than 400 °C).
Oxidisation cannot occur due to the complete lack of
additional cooling sheets (radiators) made of brass or
copper.
If the heater band width is 48 or 63 mm, centrally located
sensor bores are possible.
Considerably lower energy consumption than in systems
in which the heating resistor is pressed or cast in
aluminium.
Simple, modular setup enables short delivery times.
