Ultrasonic welding: in the ultrasonic industry, filtration is the treatment of materials used to create objects filtrate air, liquids or dust. Ultrasonic welding machines have the exclusive feature of processing very narrow tubular goods. Filters of any shape, particularly narrow, conical forms can be realised with overlap seams or folds, especially fine cutting welds can work easily and precisely on our special machines. One of the applications in which ultrasonic technology is most commonly efficient is the sewing of filter fabrics finely hatched made of polyamide and with filtration degree at a micrometric level, normally used in the biomedical field.