Patent ID: 6105341
Filing Date: 2000-08-22
Classification: B21D

Abstract:
An assembly line method for packing goods in containers, each container having a container body and a lid which are seamed together by a seaming mechanism of a machine located at the end of the assembly line, each container body having a sealed bottom and an open top as it enters the assembly line, the method comprising the sequential steps of:(a) filling a succession of container bodies with goods;(b) injecting the succession of container bodies with a predetermined amount of liquid nitrogen;(c) covering the open tops of the container bodies with lids; and(d) applying a biasing force against the lids to maintain the lids on the liquid nitrogen filled container bodies until the container bodies reach the seaming mechanism, the biasing force being sufficient to allow (i) a portion of nitrogen gas from vaporization of the liquid nitrogen, and (ii) air originally present in the container body, to escape from the container body, while preventing surrounding air from entering the container body.