4. What are the technological limits of hot-air welding?

There are few limits to this technology, apart from the thickness and heat behaviour of the materials.

• Thin thicknesses (less than 70 µm) require precise temperature control.

• The other critical point is the processing mode of the thermoplastics you have to weld. Here are a few high-risk processing methods: extrusion blow-molding, extrusion stretch-molding, injection blow-molding, foamed materials, certain non-woven, woven or needle-punched textiles, and so on. So if one of your materials is the result of one of these processing methods, there's a risk that it will "shrink"; it...