Method of producing a packaging container, a packaging container and a curling tool

A method of forming a paperboard packaging container from a rectangular body blank, the method comprising the steps of;

• a) providing a rectangular body blank having a first side edge and a second side edge;
• b) forming a tubular container body from the rectangular body blank, the container body having a first end with a first end opening and a second end with a second end opening and a container body wall extending in a height direction of the packaging container between the first end opening and the second end opening, the container body wall having an inner surface and an outer surface;
• c) sealing together the first side edge and the second side edge of the body blank;
• d) closing the first end opening by pressing a paperboard disc into the first end opening, the paperboard disc having a peripheral flange being flexed towards the first end of the container body in the height direction of the paperboard packaging container, and sealing the peripheral flange of the paperboard disc to the inner surface of the container wall;
• e) pressing the first end of the tubular container body into a curl forming portion of a curling tool, the curl forming portion comprising a tool inner surface having three or more spaced apart protuberances, thereby curling the first end of the container body wall inwardly forming a first curled edge comprising a bent edge portion and an inner portion, and providing the inner portion of the first curled edge with three or more spaced apart indentations along a circumference of the tubular container body, the indentations being formed by the spaced apart protuberances of the tool inner surface, wherein the spaced apart protuberances are spaced apart from one another along a circumference of the curl forming portion;
• f) filling the packaging container with bulk solids;
• and
• g) closing the second end opening;
• wherein steps g) and subsequently step f) could alternatively be performed after step c).