| 摘要 |
PURPOSE:To offer an easy-to-open and low-cost packaging tray by providing one or more cuts at the end of a welded sealed part. CONSTITUTION:A heat-shrinkable film 2 is folded to half. After an object 1 is held in the film 2, its edges 3, 3', and 4 are welded and sealed. Then, the film 2 is heat-shrunk to complete a tight packaging. Before heating, the film 2 is provided with one or more cuts 5 at the end to form cutted sealed parts 8. The cuts 5 may be provided during or after holding the object 1, or simultaneously with welding and sealing. Then, the film 2 is heated to package the object 1 tightly. During the heating and shrinking, the cut and sealed parts 8 at the edge are deformed to form projections 6 to be used for opening at the welded and sealed part of the film 2. |
