Method for producing a sealing tape roll

A method for producing a sealing tape roll with a plurality of interior barrier layers, each of which extends over at least 50% of a width of the sealing tape roll between opposite end surfaces of the sealing tape roll, comprising the steps of:

• (a) providing a first foam web of flexible foam comprising a top surface, a bottom surface, and two side surfaces connecting the top surface and the bottom surface to each other, wherein a longitudinal direction is defined parallel to the bottom surface and parallel to the side surfaces, and a transverse direction is defined parallel to the bottom surface and perpendicular to the longitudinal direction;
• (b) applying a first barrier layer to a first surface of the first foam web to form a laminated foam web, wherein the first surface corresponds to the top surface or to the bottom surface of the first foam web, and a second surface corresponds to the respective other one of the top surface and the bottom surface of the first foam web;
• (c) introducing a plurality of first cuts into a top surface of the laminated foam web in the transverse direction and introducing a plurality of second cuts into a bottom surface of the laminated foam web in the transverse direction to form strips arranged behind each other in a row in the longitudinal direction, wherein each of the second cuts is longitudinally offset from one of the first cuts, and wherein a connecting section remains between two adjacent strips;
• (d) folding over the strips in an area of the connecting sections to produce a foam-barrier layer web such that subsections of the top surface of the laminated foam web, which are adjacent to a common connecting section, lie opposite each other, and subsections of the bottom surface of the laminated foam web, which are adjacent to a common connecting section, lie opposite each other;
• and
• (e) forming the sealing tape roll by (i) winding up the foam-barrier layer web around a rotational axis to form the sealing tape roll;
• or (ii) winding up the foam-barrier layer web around a rotational axis to form an intermediate roll and cutting through the intermediate roll at one or more axially adjacent points to produce a plurality of sealing tape rolls, which are narrower than the intermediate roll;
• or (iii) introducing at least one cut into the foam-barrier layer web in a longitudinal direction of the foam-barrier layer web to form foam-barrier layer strips and winding up the foam-barrier layer strips around a rotational axis to form individual sealing tape rolls.