18-06-1969 дата публикации
Номер: GB1155082A
1,155,082. Portable containers. P. EISLER. 16 June, 1966 [17 June, 1965], No. 59086/68. Heading B8D. [Also in Division F2] A container material for packaging goods needing heat processing comprises a convolute or spirally wound wall of laminated material, at least one of the laminµ being an electrical heating film consisting of patterned foil. The outer layers of the material may comprise spirally-wound and adhesively-laminated paper 52, 53 with an outermost layer 51 of aluminium foil. These outer layers may include plastic or elastomeric films, cellular material or reinforcing steel strips. The inner layer may be aluminium foil strip.54 with seamed edges 55, or may be a plastics film strip, such as polypropylene, the edges of which are sealed together as at 57 during winding and may be overlapped. Preferably the heating film is located between layers 54 and 53 or 56 and 53. As shown in Fig. 3, a heating film 61 has a wide bus-bar margin 62 which is folded over and is slightly wider than the rest of the heating film and insulated therefrom. The bus-bar 62 may be bare aluminium foil or may be backed by a plastics film 63. Metallic end closures of the finished containers may make electrical contact with the heating films, or alternatively, where insulating end closures are used, the foil pattern of the heating film is bared on at least two terminal areas. An innermost layer may be applied to a cut-off length of the container material provided with a bottom cover, by blow moulding a plastics material into the soformed drum, or by coating, optionally assisted by energizing the heating film. Foam-forming compounds may be applied and expanded in this manner.
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