The mold heating split sheath cartridge heater are improved products of ordinary cartridge heater. It is formed by folding a semi-circular D shape electric cartridge heater in half. After its half-folding is applied, its self-expansion force closely matches the die hole. The advantages of high power density, long service life and high heat efficiency are the replacement products of the single-end heating element of the mold, especially for the molds that require high temperature and fast heating rate.
If the process requires higher temperature and/or higher watt densities , consider this:
1. Instead of drilling the hole, ream it to a tighter tolerance
2. Use split sheath cartridge heaters (see below)
3. Add more heaters to reduce watt density per cartridge heater
General considerations when ordering cartridge heaters:
2. Total watts required
3. Lead configuration
The split sheath design has a continuous heating coil which eliminates the cold spots which can occur at core junctions in ceramic core heaters. Uniform sheath temperature is vital when molding heat-sensitive plastics where the temperature window between gate freeze-off and material degradation is very narrow. By varying the watt-density, the temperature profile may be customized to specific requirements. For example, applications requiring higher temperatures at the tip can be accomplished with split sheath heaters but not with conventional cartridge heaters.