Cartridge Heaters offer hot tip option.

Press Release Summary:

Watt-Flex® Split-Sheath Cartridge Heaters can be constructed to deliver full heat to tip, making them suitable for injection molding applications. Split-sheath construction allows each half of heater to expand independently. Continuous-coil design eliminates cold spots between sections. Standard diameters include 1/4, 3/8, 1/2, 5/8, 11/16, 3/4, and 1 in., as well as 8, 10, 12, 12.5, 15, 16, and 20 mm; in lengths from 1¼ to 72 in., and with operating temperatures to 1700°F.

Original Press Release:

Watt-Flex® Cartridge Heaters Available With Hot-Tip Option

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 1¼ 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:,

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