| 摘要 |
Packing containers of the non-returnable type which are manufactured from flexible laminate material usually have sealing fins (3) which extend over one or more walls (2) of the packing container. In parallelepipedic packing containers, moreover, triangular corner lugs (4) are present over which the sealing fins (3) extend. In the final shaping of the packing container the corner lugs (4) are folded down and fixed against the side walls (2). This is made more difficult, however, as the sealing fins (3) have to be double-folded which because of their thickness and stiffness brings about deformations and stretching which cause damage to the packing material, so that it no longer remains liquid-tight and gas-tight.
<??>This is avoided in accordande with the invention by folding different portions of the sealing fin (3) in different directions so that the folding down of the corner lugs (4) can take place without the thickness of the sealing fin having a hindering effect. As a result the impermeability to liquid and air of the finished packing container is appreciably improved, and this is very important in the packaging of e.g. liquid foods. |
