FAQ

We recommend assembling subsequently: 1. Nozzle heaters – protection against penetration of melt and other foreign bodies or liquids; then install additional zones with mica strips, which have higher resistance to melt damage than ceramic heating strips, which we recommend to install in the next section of the chamber towards the material hopper.

For good transfer of heat energy between the source and heated element, it is advisable to use a heat transfer agent (spray or paste) on the contact surfaces. This ensures good power transmission, longer life and greater heating efficiency. In the case of heating cartridges, this also results in less risk of “freezing” of the cartridge in the bore of the heated element.

In applications where PVC heat treatment occurs, brass cartridges/heating strips cannot be used – they are extremely corrosive due to PVC vapours.

The service life depends on the element heat load, operating time and operating temperature. Also crucial is the efficient transfer of heat from the source to the appliance. Every interface (air, paper,…) that heat energy has to overcome will cause a temperature gradient and reduce power flow from the element to the heated piece. Thus, the contact surfaces must be in contact with each other as much as possible, ideally with a constant force.
Another factor is the operating voltage and its stability. Voltage directly affects heating performance. In an unfavourable configuration, the heating (although short-term) may be overloaded and its life is reduced.

There must always be a technical specification for the production of a heating element, but it is not necessarily always a sketch – our engineers will assist you in creating the required specification. For the production of heating strips (e.g. heater to the tip of the injection moulding machine), it is sufficient to send us the diameter, width, voltage and power. Next, the outlet length and its slope and direction. For more complex heating elements with e.g. openings, we recommend sending us its sketch. We will also welcome the sending of a sample of the heating element, which may be non-functional.

A flat heating element is most suitable for heating plastic moulds. This heating element has different shapes and outlets. It is fastened by means of a pressure cuff or pressure plates. The heating element has a micanite (synthetic mica) or ceramic insulation. It is also possible to use heating cartridges placed in bores in the mould block.