The Ultrasonic Welder uses sound waves to fuse together thin, flexible materials that contain plastic. Rather than using adhesives, it produces high frequency, ultrasonic vibrations that generate heat. This softens the materials as they move through the machine, welding them together, before they cool and harden. By adjusting the power, speed, and pressure you can experiment with various materials. These include polyester, nylon, spandex, acrylic fabrics, plastic bags, tarps, sheeting, tyvek, and shiny food wrappers!