STIR® affords varied options for the optimal solution of concrete technical-technological problems.
The transfer of STIR® onto a fiber composite material can be effected both outside and inside of an autoclave. An electronic heater is used as emitter, which has following characteristics:
- High temperature radiators (2D) with, e. g. 700 °C at λmax= 3.1 µm and a good energy transfer for NH- and accordingly OH-groups in EP-resin.
- Middle temperature radiators (2D) with, e. g. 410 °C at λmax= 4.4 µm and a good energy transfer for NCO-groups in PUR.
- Low temperature radiators (2D or 3D) with, e. g. 100 °C at λmax= 8.04 µm and a good energy transfer for the epoxide ring in EP-resin.
The selection of a matching system for conglutination of construction material & activating of adhesives conforms to therequirements of the application, the infrared hardening material and the requested processing parameters. STIR® rod-shaped or flat emitters are used for these applications.
- Rod-shaped emitters are particularly suitable for large surfaces. They can be set into a curing chamber (modular system) or being integrated into a customer-specific solution.
- Batwing radiators (2D or 3D) are especially in use for specific, technologically difficult requirements
For the heating of plastics foil high-duty STIR®-heaters are used. Depending on the process parameters they can be arranged separately or in modules. Appropriate to the width of the plastics length of material, the connection to an external heater is possible. By the variation of the heater output a constant heating can be ensured.
Depending on the raw material and its thickness, the ovens can be 3 to 6 times shorter and thereby much cheaper.
- For thin foils it is appropriate to use a heater for a one-sided heating, whose emission accords to the absorption of the plastics.
- For thick foils a both-sided heating with shorter phase wavelengths is recommended. Besides a good absorption the sufficient diffusion is necessary.