| 摘要 |
1469994 Packaging in protective atmospheres CVP SYSTEMS Inc 29 May 1974 [29 May 1973] 23893/74 Heading B8C [Also in Division A2] An apparatus for packaging one or more articles 17 in a flexible, substantially gas impermeable bag C, (D) Fig. 22 (not shown), under a protective atmosphere comprises a roller conveyer 84, (302) on which the filled bag is supported in an outer box B, front and rear suction manifolds 132, 134, (324, 326) which can grip the open end of the bag and upon rearward movement of the rear suction manifold 134 open the bag to permit the introduction of snorkels 246 (306) through which the bag is evacuated and provided with its protective atmosphere, flexible pads 142, 186, (344, 368) on the opposed faces of the suction manifolds for temporarily sealing the bag about the snorkels upon forward movement of the rear suction manifold 134 towards the front suction manifold 132, and a heat-sealing member 280 and a back-up pad 148, associated with the suction manifolds, for closing the bag upon withdrawal of the snorkels 246. The front suction manifold 132 is movable from a raised position which permits manual positioning of the bag open end against the rear suction manifold 134, to a lowered position opposite the rear suction manifold. Clamps (198), Fig. 9 (not shown), (372) Fig. 27 (not shown) which are mounted on the rear suction manifold, assist in the retention of the bag until it is also gripped by the front suction manifold. The snorkels 246 which may be mounted for independent movement relative to each other, are linked to the rear suction manifold so that they are always correctly positioned relative to the bag opening. The suction manifolds, the snorkels, the heat sealing member, and the clamps are driven by pneumatic piston and cylinder assemblies, and the apparatus is controlled automatically by a pneumatic and electrical system. The height of the roller conveyer is adjustable. The protective atmosphere may comprise a carbon dioxide and nitrogen mixture at atmospheric, or slightly below, pressure. The carbon dioxide concentration is preferably 50% by volume. The bag (D) may comprise two compartments which are separable along a line of perforation, and be formed of a laminate of nylon and Surlyn (R.T.M.). |
