| 摘要 |
FIELD: packing industry. ^ SUBSTANCE: film that a package is made of comprises several layers, including, at least the first welded layer and the second layer, which is butt-welded partially or not welded at all. At the same time edges of every layer are in direct contact and at least one thin tape, thickness of which is considerably less than the film thickness. The specified tape closes edges and is directly connected to one of the surfaces of the second layer. At the same time difference of melting temperatures of the first layer and the other layer or other layers exceeds 20C. ^ EFFECT: higher strength of the welded seam to the level equal to the strength of the film, from which the package is made, improvement of aesthetic properties. ^ 10 cl, 5 ex, 8 dwg |
