Separation unit and a dispenser comprising a separation unit

A separation unit for separating a web material along preformed lines of weakness, said separation unit having a width direction and comprising

• at least a first device having an axis extending in said width direction and a web width extending in said width direction, and
• at least a second device having a rotational an axis extending parallel with said axis of said first device and a web width extending in said width direction, said second device being positioned at a distance from said first device, said distance extending in a direction perpendicular to said width direction,
• wherein each of said first and said second devices is provided with at least one protrusion element extending perpendicularly from said axes,
• wherein each of said protrusion elements has a maximum width in said width direction, a maximum extension from said axes, an inner portion adjacent to said axes, and an outer portion remote from said axes,
• wherein said outer portions of said protrusion elements on said first device are arranged in a staggered relationship with said outer portions of said protrusion elements on said second device,
• wherein said outer portions of said protrusion elements on said first device are partially overlapping with said outer portions of said protrusion elements on said second device with a overlap length, thus forming an undulating passage for a web material between said devices,
• wherein said overlap length is between 2-40 mm,
• wherein the separation unit is configured to separate the web material along a preformed line of weakness as the preformed line of weakness passes through the undulating passage.