An apparatus for forming containers with reinforced edges, comprising: a roll for feeding a flexible film; a forming collar upstream of a first tube around which the film is wrapped; a device for heat-sealing the longitudinal flaps of the film wrapped around the tube so as to form an enclosure, wherein the first tube tapers into a second tube and at the tapering region there is provided at least one insertion element which acts at right angles to the surface of the film, so as to form at least one rib which is directed toward the inside of the enclosure, and further comprising a sealing device for at least partially heat-sealing the at least one rib.
In the method for feeding blanks in the container-forming unit, the blank is advanced onto the wrapping mandrel which is attached to a moving structure, which moves the wrapping mandrel between the different processing stations of the container-forming unit. Blanks are advanced as a continuous blank web to the wrapping mandrel of the wrapping station, where they are detached from the end of the blank web and advanced onto the wrapping mandrel. The blank web is fed by means of a conveyor situated before the detachment point in the feeding direction by steps corresponding to the length of a blank, and after each feeding movement a blank is detached from the end of the blank web.
Method for manufacturing a tube-shaped package having longitudinal sides and a bottom and made of flexible material, wherein the longitudinal sides of the package are sealed prior to forming the bottom and the bottom is formed by pushing an annular portion of the flexible material inward in a U-shaped arrangement at at least on closed end of the tube-shaped package.
