Liquid Cooled Cast-In Band Heaters

Liquid Cooled Cast-In Band Heaters for Extruders

Type CW
Single Cooling Tube with Strap Clamping

Liquid cooled and/or heating functions
Features 1/4", 3/8" or 1/2" diameter cooling tubes
Secured to the extruder barrel with 3/4" or 1-1/4" wide low expansion stainless steel clamping straps with 1/4"-20 socket head cap screws and barrel nuts.
If not otherwise specified, supplied with Type S electrical screw termination, 3" long cooling tube extensions and straps for clamping.

Type CWB
Single Cooling Tube with Bolt Clamping

Liquid cooled and/or heating functions
Secured to the barrel by bolts clamping the two halves together. A variety of bolt clamping designs and hardware are available.
If not otherwise specified, supplied with Type S electrical screw termination and 3" long cooling tube extensions.

Type CWW
Dual Set of Cooling Tubes
(within the Same Heater)

Incorporates two sets of 3/8" or 1/2" diameter tubing.
Clamping styles are low thermal expansion alloy straps or bolt clamping.
If not otherwise specified, supplied with Type S electrical screw termination, 3" long cooling tube extensions and straps for clamping.

The two main causes of failure on liquid cooled Cast-In Heaters are stress corrosion cracking at the exiting point of the tube extensions and clogged lines due to scale build-up. When the first set of cooling tubes fails, simply reconnect to the spare set and you are back in operation.

Dual cooling tubes are also used when additional cooling capacity is required.

Type RC
Non-Exposed Cooling Tubes
(Recessed NPT Fittings)

Incorporates 3/8" or 1/2" diameter tubing
Specially designed stainless steel NPT fittings available in two female NPT thread sizes, 3/8"-18 and 1/2"-14 are welded to the tube ends and cast below the surface of the Cast-In Heater. This feature eliminates broken and/or damaged cooling tube extensions, a major factor in premature heater failure.
Clamping styles are low thermal expansion alloy straps or bolt clamping.
If not otherwise specified, supplied with Type S electrical screw termination and straps for clamping.

Standard Sizes and Ratings

The Cast-In Band Heater accessed through the links below constitute a small segment of the thousands of Cast-In Band Heaters we have produced for plastics processing equipment. In order to assist you in selecting the exact heater replacement for your machine, adhere to the following instructions:

Measure the O.D. of your barrel, which in turn will be the I.D. of the heater.
Measure the width of your heater.
Check the wattage and voltage rating per half or per segment. This information is normally stamped on the heater.
Establish heater cooling function, if any. If water cooled, measure length and diameter of cooling tube extensions. Cooling tube extensions are 3" long, and 1/2" * .049 O.D. wall thickness unless otherwise specified. If air cooled, Cast-In Band will have cast fins.
Check for special features such as: thermocouple clearance holes, drill and tapped holes, vent cutouts and terminal boxes.
There are two methods for securing a Cast-In Band Heater to a barrel; separate clamping straps or nut and bolt clamping.
Once you have established this information, proceed to match your heater description with one of our standard Cast-In Band Heaters. They are listed by extruder size. Starting with the I.D., read across the chart until you have a perfect match. Wattage can vary up to 15% either way with little or no effect to your process.

Extruder Size 1" to 1 3/4"

Extruder Size 2" to 2 1/2"

Extruder Size 3 1/2" to 4"

Extruder Size 4 1/2"

Extruder Size 6"

Extruder Size 8"

Extruder Size 10"

Custom engineered/Manufactured Cast-In Heaters

For sizes, ratings, terminations and/or features not listed, Tempco will manufacture a Cast-In Heater to your specifications. State quantity, watts, volts and full heater description with all the appropriate specifications and features required.

Ordering Information