| 摘要 |
The exposed edge of a box is covered by placing a strip of heat-shrinkable PVC around the box so that it projects axially beyond the box edge and heating the strip so that the projecting portion shrinks and bends over the box edge, covering it. The projecting portion can be made to project far enough so that, when the strip shrinks and bends, a portion protrudes inwardly beyond the box edge. That protruding portion is then pressed against the inner box wall by a fitted lid or mandrel. A second strip can then be applied in similar fashion and shrunk to form a guarantee seal between the box and lid. An end of the second strip is left free to provide a seal tearing grip. |
