SEPARATION UNIT AND A DISPENSER COMPRISING A SEPARATION UNIT

The present invention relates to a separation unit (1) for separating a web material along preformed lines of weakness, said separation unit (1) having a width direction and comprising a first roller (2) having a rotational axis extending in said width direction and a web width extending in said width direction, and a second roller (3) having a rotational axis extending parallel with said rotational axis of said first roller and a web width extending in said width direction, said second roller being positioned at a distance (d1) from said first roller, said distance (d1) extending in a direction perpendicular to said width direction, wherein each of said first and said second rollers (2, 3) is provided with a plurality of protrusion elements (4) being spaced along said rotational axes and protruding perpendicularly from said axes, wherein each of said protrusion elements (4) has a maximum width (w) in said width direction, a maximum radial extension (r) from said rotational axes, an inner portion (6) adjacent to said rotational axes, and an outer portion (5) remote from said rotational axes, wherein said outer portions (5) of said protrusion elements (4) on said first roller (2) are arranged in a staggered relationship with said outer portions (5) of said protrusion elements (4) on said second roller (3), and wherein said outer portions (5) of said protrusion elements (4) on said first roller (2) are partially overlapping with said outer portions (5) of said protrusion elements (4) on said second roller (3) with a radial overlap length (L), thus forming an undulating passage for a web material between said rollers (2, 3), characterized in that each protrusion element (4) has a maximum width (w) along the width direction within the overlap length (L), and the sum of said maximum widths (w) within the overlap length (L) of all protrusion elements (4) on one of said rollers (2, 3) is between 5-30%, preferably 12-20% of said web width of that roller (2, 3), wherein said separation unit (1) is configured to separate a web material along preformed lines of weakness being perforation lines formed by alternating bonds and slots and having a perforation strength of 20 to 80 N/m.