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Cartridge Heaters

National Plastic Heater

  • Cartridge heater

Article: 00021288

Cartridge heater

Cartridge Heaters and all the various names for them above are primarily used for heating of all sorts of metal parts by being inserted into drilled holes, but also have uses in the packaging industry and suitable for many other "process industry" applications. Cartridge heaters are either round tube shaped or square/rectangular designs.

Cartridge heaters are constructed of the following material components:

(i) A thin metal sheathed outer shell/tube (usually made of 304, 316 or 321 stainless steel and incoloy) that actually makes contact with the inside wall of a bore be it in a mold, platen or die and hence transferring its energy via conduction.

(ii) The cartridge heater shell houses the coiled nichrome (nickel/chromium) resistance wire, ceramic insulator and MgO (magesium oxide) insulation. The MgO is compacted via swaging to ensure all empty gaps are filled preventing a short circuit and allowing the heater to transfer its heat quickly and efficiently to the outside wall of the stainless steel shell.

(iii) A welded disc is then applied to the open end of the cartridge after the cartridge heater has been filled with MgO. This prevents the nichrome wire, the MgO and other componets from coming out. In addition, it prevents contamination, such as plastic debris, air, or moisture, to go inside the heater.

Specifications

  • Type: cartridge
  • Technology: conduction

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