Opening device for a packaging container with an unbroken, liquid-tight pouring spout (31, 33) and a closure part (3) is disclosed. A method of manufacturing the opening device entails forming the pouring spout (21, 33) with the closure part (3) as a mold, with a heated, thermoplastic material layer...http://www.google.es/patents/US5498225?utm_source=gb-gplus-sharePatente US5498225 - Opening device for a packaging container and method of manufacturing the same
Opening device for a packaging container and method of manufacturing the same
