IPSWICH,
MA -
Watt-Flex® Split-Sheath Cartridge
Heaters by Dalton Electric can be constructed to deliver full heat
to the tip, making
them ideal for applications such as injection molding. For example,
when used in molding probes, hot-tip Watt-Flex heaters minimize gate
freeze-off. Because of their continuous resistance coil, Watt-Flex
heaters can also be zoned to create custom temperature profiles.
By stretching or condensing the coil, heaters can be manufactured
to deliver
differing amounts of heat at various points along their sheath.
Due to their unique split-sheath design, Watt-Flex heaters run
more efficiently, last longer, and are more easily replaced
than conventional
heaters, dramatically reducing the overall cost of process heating.
Split-sheath construction allows each half of the heater to expand
independently when energized for exceptional metal-to-metal contact
with the surrounding bore. This in turn maximizes heat transfer,
even in oversized bores. Greater compaction of magnesium
oxide around the
coil provides superior heat conduction to the outer sheath, resulting
in more responsive sheath temperatures, higher operating temperatures
with cooler internal operation, and up to five times longer life.
Because of their continuous-coil design, Watt-Flex heaters
have no cold spots
between sections. With no sections to burn out, the entire heater
is either on or off. When the heater is de-energized, the
split sheath
contracts uniformly for easy removal. In fact, Watt-Flex heaters
are warranted removable from bores and sleeves. |
|
 |
Watt-Flex
Heaters are available in standard diameters of 1/4, 3/8, 1/2, 5/8,
11/16, 3/4, and 1 inch, as well as 8, 10, 12, 12.5, 15, 16, and 20 mm;
in lengths from 11/4 to 72 inches; and with operating temperatures
to 1700°F.
During manufacture of standard cool tip heaters, the heating coil is stretched
as it rounds the tip to achieve a lower watt-density. Heaters are available
in custom lengths and electrical ratings. Customers also have a choice
of leads, including flexible stainless-steel hose or braid to protect
against
frequent flexing and abrasion, straight or right-angle headers, threaded
post terminals, extra-long leads, high-temperature leads, fiberglass or
silicon-rubber sleeving, an internal ground wire, and a Quick Disconnect
lead with a convenient
male plug. Mounting variations include a stainless steel flange, a mounting
bracket, an NPT fitting, and a puller end plug.
Watt-Flex Heaters can be manufactured with a groove along the
exterior cartridge sheath to accommodate a needle-type thermocouple.
While conventional heater thermocouples
measure the internal temperature of the cartridge, the Watt-Flex thermocouple
measures the external temperature of the heater at the point of heat transfer
between sheath and host metal. This design provides more accurate sensing
and control than that of conventional thermocouple-equipped
heaters in temperature-critical
processing applications such as molding heat-sensitive resins.
For more information, contact: Eli Whitney, Dalton Electric Heating
Co., Inc., 28 Hayward Street, Ipswich, MA 01938, TEL: (978)
356-9844, FAX: (978)
356-9846,
e-mail: sales@daltonelectric.com, www.daltonelectric.com. |
