Adhesive tape for flying splice

#The invention relates to an adhesive tape for the flying splice of flat web material wound up into rolls, said tape having an adhesive face, a nonadhesive reverse, and two longitudinal edges, and having a main carrier which is coated unilaterally on the face with a self-adhesive composition, a portion of the nonadhesive reverse being provided with at least one self-adhesive system, and to a process for the flying splice of flat web material wound up into reels, for which an adhesive tape of said kind is suitable.

#Flying splice in paper mills or the like is a common technique for replacing an old, almost fully unwound roll of paper by a new roll without having to stop the machines, which run at high speed. It is accomplished using double-sided self-adhesive tapes, so-called tabs, which on the one hand possess high adhesion and high tack and on the other hand, owing to their water-soluble self-adhesive compositions and paper carriers, do not interfere with re-use of the paper wastes in the paper machine. These tabs are bonded artistically in a zigzag form to the start of the web, a procedure requiring experienced personnel, with only about 4 to 13 minutes' time remaining for the entire procedure, owing to the high speed of the machines.

#Although this technology is well established, it is not without certain disadvantages. Thus, experienced personnel are required, the procedure is intrinsically hectic, and the bonds are relatively thick, since in each case two plies of web and the adhesive tab in between are the result: a result which is unwanted in the paper industry, since the high thickness may result in tearing, inter alia, at the coating blade in paper coating machines.

#In the drawings

#FIG. 1 shows a diagrammatic side view of an adhesive tape of the invention

#FIG. 2 shows a diagrammatic side view of an adhesive tape according to FIG. 1, adhered to a paper roll and ready for flying splice

#An exemplary embodiment of an adhesive tape of the invention is shown in FIG. 1. Illustrated is an adhesive tape 1 having a main carrier 2 comprising single-sided label paper which does not possess wet strength (basis weight 70 g/m2, thickness 55 μm). The main carrier 2 is unilaterally coated with a high-tack adhesive 3 (self-adhesive facing layer), with an application rate of 55 g/m2. The total thickness of the main carrier 2 with self-adhesive composition 3 is approximately 110 μm, the width 50 mm. The self-adhesive composition 3 is lined with a siliconized release paper 4. At a distance of 17 mm from the left-hand edge said paper 4 is provided with a slit 5, so that the left-hand part 4a of the release paper 4 can be removed first, then the right-hand part 4b.

#At the right-hand end the adhesive tape 1 is provided with a strip of a self-adhesive composition 6 (reverse-side self-adhesive system), possessing shear strength, with an application rate of 40 g/m2; the strip of the self-adhesive composition 6 possessing high shear strength has a width of 9 mm. The distance ES of the strip of the self-adhesive composition 6 possessing shear strength from the leading edge 14 of the adhesive tape 1 is 3 mm.

#The main carrier of the adhesive tape 1 is provided with a slot 7a behind the reverse-side self-adhesive system 6 and, optionally, with a slot 7b before the reverse-side self-adhesive system 6.