DE1953420
Closure of a container is carried out by (a) placing a flat sheet of biaxially oriented thermoplastic resin over the open upper side of a lipped container, so that the sheet overlaps the lip edges, (b) downwardly pressing the overlapping parts of the sheet with a heated element, while the sheet is p...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | Closure of a container is carried out by (a) placing a flat sheet of biaxially oriented thermoplastic resin over the open upper side of a lipped container, so that the sheet overlaps the lip edges, (b) downwardly pressing the overlapping parts of the sheet with a heated element, while the sheet is pinned clamped against the container, so that shrinkage of the softened parts is prevented, and the softened parts become welded to the container, (c) folding without shrinking the downwardly pressed parts under and against the lip parts of the container, and (d) shrinking the part of the flat sheet extending over the open upper side of the container, in order to draw the folder parts tightly under and against the lip edges of the container. Use is esp. for food containers. |
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