The expandable cartridge Heaters solve two major problems with conventional high density compressed heaters, poor durability fit and proper fit extraction, improving the accuracy of the temperature with hundreds of termination.
With the expandable cartridge heaters we join for the first time the best of the common cartridge heater with a cartridge and an adaptive tuning quick and easy removal.
The Expandable Heaters are manufactured with an internals compacting system of all its components in order to increase their lifetime. The Nickel/Chrome 80/20 conductor wire is introduced into the cavities of a ceramic body which focuses the suitable separation in order to obtain a better isolation. Fully coated with magnesium oxide of high purity grain sized controlled to ensure the complete cartridge Expan filled. Later a compacting process and a rectification of surface until calibrated the desired size. And finally, a rigorous quality control that guarantees the best operation of the cartridge.
TThe Expandable Heaters consist of a compressed cartridge heater of a high performance and made with the best materials with the particularity of being able to expand itself thanks to the fork-shaped tensioned in a point that allow the expansion and retraction of the cartridge.
At the contraction process the Expandable Heaters comes back to its original status, facilitating easy removal of the orifice, with the subsequent advantages like not having to drill again the mould, reuse them in other locations, reduce the stock since it will have the same diameter for different drills, etc.
In the expansion process the expandable cartridge fits the walls of its housing, providing the correct transmission of the temperature, and avoiding the "oven effect" that occurs in other types of cartridge poorly dimensioned with respect to diameter and housing. The drills that for any other circumstances are oversized have with the expandable heaters the best solution to allow more adjustment tolerance.
The Expandable Heaters are made with just one heating wire spring shaped that has more quantity of wire than any other model of cartridge heater. We obtain, this way, a uniform heating throughout the whole perimeter, with no kinds of cold areas or with different temperatures.
1.- Compressed high charge cartridge heater thermography. It is observed various cold areas, especially in the centre of the heater from 250 mm.
2.- Ordinary bipartite cartridge heater thermography. It is observed cold spots at the end of the connections .This does not uniformly heated mould or application.