A device for friction welding together two plastic strips which provides a weld having a strength approaching that of the strips. Movable friction jaws are oscillated on axes perpendicular to the plane of and through the strips with the result that the frictional motion is greatest in the middle of the...http://www.google.es/patents/US4227949?utm_source=gb-gplus-sharePatente US4227949 - Method and device for welding superimposed strips of thermoplastic
Method and device for welding superimposed strips of thermoplastic
