Ensures high quality bonding in terms of strength, precision and aesthetics. As opposed to technologies such as impulse and high frequency (HF), hot air welding does not produce any heat stress and only affects those sides of the material that are bonded together. Since the inner part of the fabric is not affected by the heat in any way, its physical and aesthetic properties remain intact. In combination with the patented Intelligent Torque, hot air welding technology avoids puckering of the fabric and fading or altering of the colors, and ensures seams of superior quality. The technology is commonly used on PVC or PVC coated fabrics and gives excellent results when used to weld glue coated zippers to fabrics or to apply glue tape to bond acrylic and polyester.
Rotosonic (or ultrasonic) welding is an industrial bonding technique whereby high-frequency acoustic vibrations – most commonly between 15 and 70 kHz (inaudible to the human ear) – are locally applied to fabrics being held together under pressure. The materials are sandwiched between a horn (or sonotrode) and an anvil. The energy required for ultrasound welding is created by transferring the vibrations from the horn to the material. The created energy causes the molecules in the material to vibrate, resulting in heat. The heat melts the fabric layers and bonds them together in the contact points between the layers created by the pressure of the welding wheels, or melts a glue film that join the fabric.
Ultrasound welding technology is commonly used to bond thermoplastics, synthetic fabrics and films and is a fast, efficient and environmental friendly process that consumes little energy. For most materials, no adhesives or solvents, or other consumables are required.