| abstract |
(57) Summary The present invention relates to a bag made of a uniaxially stretched, preferably monolayer, polymer piece, in particular a polyolefin, preferably a polypropylene piece (1), said fabric having one or both sides, It may be coated with a thermoplastic material, especially a polyolefin, the fabric being either a tubular structure (1) or a planar fabric which is joined to form a tube, by folding the edges of the fabric, in particular a box or cube. At least one end of the bag is formed on the bottom surface, which is particularly rectangular. This bag is characterized in that at least one end of the bag, in particular the bottom surface, is subjected to the action of heat, in particular through an intermediate layer made of a thermoplastic material, in particular a polyolefin material, by means of the action of heat, a uniaxially oriented polymer, in particular a polyolefin, preferably a polypropylene strip. Is joined to a cover sheet (3) consisting of a fabric made of a material made from a material which is less than 30% of the material thickness of the outer surface portion only, especially the bottom surface and the fabric piece of the cover sheet. The result is that the polymer has become non-oriented, especially a polyolefin, preferably polypropylene, the molecule, the molecular orientation of which is maintained in the rest of the material. The invention also relates to the process of welding the cover sheet to the bottom surface of the bag. |