Electric Heating Elements for Mold Plastic

The most common electric heating elements are circular heater band,catridge heaters,tube heaters,flexible flat tube heaters and spiral heater.The heater band generally have a surface capacity of about 5 W/cm2 and are manufactured to customer specifications.The most frequently used cartridge heater are hight performance with surface capacity means that outside dimensions of the heaters can be small,an advantage for mold making.
Standard cartridge heater have capacities of about 5 W/cm2.The dimensions of hight performance cartriedge heater range from about 6.5x30mm to about 20x300mm in diameter.Various connection types and voltages are available.Some configurations include built in thermocouples.
The sensitivy of the hight performance cartridge heaters depends on their specific surface capacity(W/cm2).The higher this value is,the better the contact must be between the location hole and the cartridge.In any case it is recommended to use several cartridge of lower surface capacity to ensure ideal installation conditions.This will also produce better heat distribution within the mold.
Tube heater are used whenever components in molds and other equipment are to be hated externally in very limited space.The heat capacity in is directed inward,the sizes range from about ID 18/OD35 to about ID 60 and the capacities from abouth 200 to 1500watt.
If properly used,flat tube heater will achieve uniform temperatures over large surface areas.These heaters can be bent into any shape to fit into grooves,thermally conductive cement is used conductive cement is used as the embedding compound.
The spiral cartridge heater is made of flexible tubing,which is available in a variety of diameter.These heating elements have a surface capacity of approximately 6W/cm2,are available in length of up to approximately 1000mm and can be bent by the user in accordance with requirements.Thee effectiveness and the service life of electric heating elements depend to the mold.The tapered hight performance cartridge heaters illustrated in fig fit in the location hole and easily removed.
The cartridge with standard 1:50 taper is fitted and removed with sleeve nut via the circlip.This heating element will fit tightly,even in awkward installation position,the location bore can be machined with standard tools.

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