| 摘要 |
The packaging case is made from a thin semi rigid sheet having an opening closed by flaps (5). It has two opposite faces (1,2) which have flutings (3).The flaps (5) are an extension of these faces (1,2) and have flutings of the same form and same direction as the flutings (3). The folding line (7) is curved so as to give the opposite faces, after folding the flaps, a convex form and the flaps a concave form allowing the automatic fastening of the ends. Flutings on opposite faces are displaced on one half relative to the edge folding lines (4) to allow correct fitting of the flutes when the case is flat. USE - Packaging and preserving sandwiches.
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