In pleated filter Production, two layers should be sealed to each other and if Ultrasonic vibrations are used to do it, the result is a very strong welding. Pleated filters are used in chemical, cement, food and automotive industries. They are widely welded by ultrasound technology. If the filter material is a kind of thermoplastic like polyester or pp, welding becomes easy. If the filter material is a kind of paper, it should be covered by a thermoplastic lacque. Sonikel Ultrasonics, designs continuous welding machine for pleated filter applications.