1. The resistance wire used for cartridge heater element has uneven hardness
As the resistance wire material hardness is not uniform, resulting in the electric heating wire winding pitch is not uniform. This usually occurs when the pulled heating wire is in the recovery process. When spiral heating wire is wound, uneven tension will also affect the uneven pitch.
2. Improper design of heating elements for cartridges.
In general, the heating line in the cartridge heating element is spiral, that is, spring shaped. When the ratio of the diameter of the wire core rod D to the diameter of the heating wire D is D/D> 8, when the powder is added, there will be drooping phenomenon, that is, the upper and lower density of the electric heating wire.
3. Improper operation of hot rod cartridge heater
When powder is added, the exposed rod does not meet the requirements. When the powder is too short, when the powder is twisted, the powder is pulled out, the tube is pulled out. When the rod is too long, the rod is compressed when the powder vibrates. When this is done, the heating wire is partly too thin or partly too dense, and even the heating wire and coil are short-circuited. Improper operation of the shrink tube process will also affect the uniformity of the hot wire distribution.
