Made from either film or paper, it can be applied to the opening area of the bag during the packaging process. When the pack is torn, the film tears until it meets the curved edge of the swof label. The film then tears along the label to the outer edge. This controls the opening of the package.
The swof (sinus wave opening function) label is a self-adhesive label from Mörk Naturprodukte (Nürtigen, Germany) used for controlling the opening of flow-wrap packs.
Apr 30, 2000