Welding
When welding thermoplastics, a direct fusion of foils occurs under heat. In addition to the seam strength, the optically convincing design of the visible weld seams is an important quality criterion.
HF-Welding & Heat impulse welding
The two preferred methods of welding include high frequency and heat pulse welding. In the high-frequency welding process, the foils to be welded are exposed to a high-frequency electromagnetic alternating field. The required welding heat is produced by molecular vibrations directly in the material. The process is suitable for polar plastics. Thicker films can also be processed. The necessary welding heat is generated by current pulses in a thin metallic heating band in the heat pulse welding process. The welding temperature can be precisely adjusted.
These processes are suitable for thin foils of all common thermoplastic materials. At ORTMANNS, we use this welding technology especially for ring binder production. Cardboard is covered with PVC material, so to speak, and welded accordingly. But not only ring binders can be designed in this way, but we also weld folders, clipboards and transparent covers completely individually according to your ideas.
Advantages of high frequency welding:
- very high seam strength (up to 70% of the base material)
- best seam quality due to ideal temperature curve and cooling under pressure
very thick foils can be welded - Possibility of separation and contour welding
- low energy consumption
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