A dental tape is constituted by a length of incipiently fibrillatable plastics film. The tape may be made by extruding a polypropylene film in strip form onto chilled take-off rollers and then roll embossing the film by means of hardened steel rollers. After embossing, the film is oriented by means of...http://www.google.fr/patents/US4646766?utm_source=gb-gplus-shareBrevet US4646766 - Dental tape
