Abstract: A package made out of a sheet material like paper, cardboard, etc., and with a welded-seam closure in the upper surface, especially a parallelepipedal package for liquid, made out of a material that is a composite of paper and plastic and having folded triangular flaps that can be folded down against the walls. In order to provide a package that is even easier to open and that in particular will be cheaper to manufacture with respect to the costs of materials, at least one side of the welded-seam closure has a thickening that facilitates ripping into it or ripping it out.

Abstract: The invention relates to a device for folding and sealing the head of a folded carton made out of a web or blank of cardboard coated on the inside with a thermoplastic layer. The device has levers or supports that carry the folding and pressure-welding tools and that are powered independently of each other by shafts. The result is a structure that is simple and easy to clean. It also allows satisfactory acceptance or introduction of force for the pressure-welding process. Since the force-introduction impact point and a point of contact between the tools that are to be approached to each other like tongs can be located on an axis of pressure, the shafts that pivot and power the lever and support need to accept no forces and accordingly remain free of stress.

Abstract: In a carton for liquids folded from a sheet of packaging material wherein the carton has a lapped seam with a protected edge, the improvement which comprises providing the protected edge with a wedge-like tapered profile, whereby the thickness of the sheet material is reduced along the protected edge. The sheet material carries a thicker protective coating on the inside of the carton and a thinner coating on the outside. The seams are lapped by various configurations of the wedge, depending upon which face is undercut.