Method of producing corners in channel material using ultrasonic energy

摘要: A method of producing a corner in thermoplastic flexible channel material having base portion and at least one leg comprises flattening the outwardly while folding with "U" bend upon itself to provide an overlapped portion. Ultrasonic energy is applied flattened for simultaneously sealing cutting oblique angle longitudinal axis material. Upon releasing material, restored its original shape, but exhibiting formed corner.