sentences:  It was reportedly Rausing's wife Elisabeth who came up with the idea of continuously sealing the packages through the milk while filling the tube in the manner of stuffing sausages, to prevent oxygen from entering the package.In 1946, a model packaging machine was presented by engineer Harry Järund, and in collaboration with Swedish paper mills and foreign chemical companies, a viable paper for packaging was finally produced by coating carton paper with polyethylene, which made the paper waterproof and allowed for heat-sealing during filling.AB Tetra Pak was established in Lund, Sweden, in 1951.