Package and method of forming same

Abstract

Abstract 1,131,629. Packages. OSCAR MAYER & CO. Inc. 1 April, 1966 [5 April, 1965], No. 14474/66. Heading B8C. An article, e.g. sliced meat, is packaged under vacuum in a preformed container 12 of plastics sheet material, the container being supplied to closing and sealing apparatus, Fig. 5, with its contents, and a plastics closure (14) lying in position above the inverted container. A vertically reciprocable vacuum box 45 is lowered over the partially closed package which is seated in a holder 35 on an intermittently moved conveyer 36. On vacuum being applied, a sealing platen 54 is lowered pneumatically, heaters 55 in the platen activating an adhesive 33 between flanges on the closure 14 and container 12. Before sealing takes place a spring-loaded pressure plate 60 suspended below the platen from a yoke 61 engages within the closure 14 to compress the container contents, annular channels or folds 20, 30, in the closure and container respectively, enabling these members to flex under the pressure. After sealing, the vacuum is cut off and members 45, 54 and 60 are raised before the conveyer advances. The package may be heat-sealed without the use of adhesive. Package.-A wide lateral flange 18 is formed at one side and is apertured to enable the package to be hung up. The container 12 may be of cellulose acetate, nylon, polycarbonate, polystyrene, polypropylene or polyethylene. Each of these materials may be coated with " Saran " (Trade Mark). A label 23 may be applied to the flange 18. The closure 14 is opaque. In a modification, Figs. 6-7 (not shown), the container (12), which is transparent, is of circular cross-section. To improve reclosing of the package after it has been opened, the closure may be formed with an external bead (121), Figs. 8-9 (not shown). The closure may be shaped as it is applied, Figs. 10-11 (not shown), and the package strengthened by a cardboard sheet (147) adhered either to the container flange or the closure. The container may be grooved both circumferentially (164) and vertically (165), Figs. 12-15 (not shown), enabling it to deform, thereby facilitating vacuumizing or flushing with nitrogen. The container and closure may both be of vinylidene chloride.

Inventors

No inventors recorded.

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