Adhesive bonding system for joining flat webs when changing rolls of such webs, comprising two adhesive tape boundary edges, and further comprising - a top carrier layer and a bottom carrier layer - a flat connecting element that o connects the two carrier layers to one another and o is suitable for opening the connection under the conditions of a static or flying roll change, - two layers of adhesive, each provided on the surface of each carrier layer that faces away from the connecting element, where - the connecting element is not a layer of adhesive, where layers of composition are not layers of adhesive when in the dried state they possess no self-adhesive properties, in other words have no tack, - the connection between the connecting element and at least one of the carrier layers is not brought about by means of further layers of adhesive, characterized in that - the connecting element o comprises a polymer layer which is delaminable from the top and/or the bottom carrier layer(s), the polymer for the polymer layer being selected from the group of polyvinyl chlorides, polyvinylidene chloride, polyvinyl alcohols, polyvinyl acetates, polyvinylpyrrolidones, copolymers of vinyl chloride and vinyl acetate, - at least one of the boundary edges of the connecting element does not extend in a straight line, - and a straight-line emphasis line (main direction line) is defined in relation to this boundary edge, - the emphasis line of this boundary edge extending along a preferential direction, and - this boundary edge having a multiplicity of regions lying on one side of its emphasis line and also a multiplicity of regions lying on the other side of its emphasis line. - a top carrier layer and a bottom carrier layer - a flat connecting element that o connects the two carrier layers to one another and o is suitable for opening the connection under the conditions of a static or flying roll change, o connects the two carrier layers to one another and o is suitable for opening the connection under the conditions of a static or flying roll change, - two layers of adhesive, each provided on the surface of each carrier layer that faces away from the connecting element, - the connecting element is not a layer of adhesive, where layers of composition are not layers of adhesive when in the dried state they possess no self-adhesive properties, in other words have no tack, - the connection between the connecting element and at least one of the carrier layers is not brought about by means of further layers of adhesive, characterized in that - the connecting element o comprises a polymer layer which is delaminable from the top and/or the bottom carrier layer(s), the polymer for the polymer layer being selected from the group of polyvinyl chlorides, polyvinylidene chloride, polyvinyl alcohols, polyvinyl acetates, polyvinylpyrrolidones, copolymers of vinyl chloride and vinyl acetate, o comprises a polymer layer which is delaminable from the top and/or the bottom carrier layer(s), the polymer for the polymer layer being selected from the group of polyvinyl chlorides, polyvinylidene chloride, polyvinyl alcohols, polyvinyl acetates, polyvinylpyrrolidones, copolymers of vinyl chloride and vinyl acetate, - at least one of the boundary edges of the connecting element does not extend in a straight line, - and a straight-line emphasis line (main direction line) is defined in relation to this boundary edge, - the emphasis line of this boundary edge extending along a preferential direction, and - this boundary edge having a multiplicity of regions lying on one side of its emphasis line and also a multiplicity of regions lying on the other side of its emphasis line.