|Cast-In Heaters for Plastics Processing
Liquid Cooled Cast In Barrel Heaters
Liquid cooled cast-in barrel heaters are the most common cast-in heater design
used on plastics extrusion barrels. The liquid cooling tubes run symmetrical to the
heater element, which provides a uniform cooling pattern across the body of the
casting. This cooling function dissipates heat rapidly from the cast-in barrel
allowing a tight control of the melt temperature during operation.
Air Cooled Cast In Barrel Heaters
Finned air-cooled cast-in barrel heater designs provide effective heating and
cooling for plastics extrusion barrels. The fin pattern can be supplied as a
standard height of 1" or manufactured to a low profile thickness for small
extruders or applications requiring rapid cooling. This pattern is designed to allow
the optimal airflow around the casting for maximum cooling rates.
Air Cooled Cast In Heaters with Shrouds
Individual shroud and blower systems can be used with finned barrel heaters as
self contained systems on extruder barrels. The shrouds are manufactured as
cast aluminum with bolt mounting or a hinged clamshell design fabricated from
stainless steel . The internal design of throat maximizes the airflow over the
finned heater body for rapid cooling.
L-Shaped Square Cast In Barrel Heaters
The "L" shape cast-in heater design is typically used on square and rectangular
extruder barrels, which utilize a twin, screw design. In most cases, the high
operating temperatures in these applications require these cast-in heaters to be
constructed of a bronze alloy, however aluminum alloys are used for applications,
which do not require the higher watt densities.
Vent Cut Out Cross Head Die Cast In Heater
Special sections of the cast-in extruder barrel such as a vent or feed throat
require custom modifications to fit properly. These Vent/Cutout Cast-In Heaters
are designed with element locations that maximize heater performance, but allow
for special machined sections that could not be added to a standard barrel
Heat-Only Cast In Heaters
Although not a common design, heat only cast-in barrel heaters are available
primarily with the stainless steel mounting strap option. This design is standardly
1" thick and can be used with all standard electrical terminations. The cast-in
heat only design can be used on piping areas that are typically more difficult to
heat such as elbows and joint areas. The cast-in heater can also be cast directly
onto pipe elbows or other areas to produce an integral heated part in specific
applications such as feed pipes or heat exchangers. Designs are available in
both aluminum and bronze alloys.
Cooling Jackets for Cast In Barrel Heaters
Cast-in cooling jackets are manufactured for specific applications that do not
require heat but require a uniform cooling source, which can be controlled. The
cooling jacket typically is 1" thick with ½" cooling tubes that are either stainless
steel or Incoloy® depending on the application. As with other liquid cooled
designs, all standard cooling tube terminations are available.
Used in plastics processing, food warming,
semiconductor manufacturing and other
industries, Cast-In Thermal Components are
available in aluminum, bronze and brass alloys
and are highly customizable.
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