| 摘要 |
<p>A cartridge heater may include an elongated core assembly inside an elongated metal sheath having first and second ends and wherein the elongated metal sheath is made from at least one of aluminum alloy and copper alloy. The elongated core assembly includes a resistance heating element mounted to an elongated insulating core with electric leads extending outside the elongated metal sheath. The core assembly substantially fills the elongated metal sheath with a very thin space between an inside surface of the elongated metal sheath and an outside surface of the core assembly</p> |
