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1. (WO2019045610) SEPARATION UNIT AND A DISPENSER COMPRISING A SEPARATION UNIT
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A separation unit (1) for separating a web material having a web width (W) along preformed lines of weakness, said separation unit (1) having a width direction (W) and comprising at least a first shaft (2) extending along a first longitudinal axis (20) in said width direction (W') and at least a second shaft (3) extending along a second longitudinal axis (22) in parallel with said first shaft (2), said second longitudinal axis (22) being positioned at a distance (d1) from said first longitudinal axis (20) in a direction perpendicular to said width direction (W'), said separation unit (1) further comprising

at least one first protrusion element (4) extending perpendicularly from said first shaft (2) and being arranged to be rotatable about said first longitudinal axis (20), and

at least one second protrusion element (4') extending perpendicularly from said second shaft (3) and being arranged to be rotatable about said second longitudinal axis (22), wherein, in a use position of said separation unit (1),

said first and second protrusion elements (4, 4') are arranged in a staggered relationship such that said protrusion element (4) of said first shaft (2) is partially overlapping with said protrusion element (4') of said second shaft (3) with a radial overlap length (L) in a direction perpendicular to said shafts (2, 3), thus forming an undulating passage for said web material between said shafts (2, 3) with said web width (W) extending in said width direction (W'), characterised by

at least one contact element (42') being arranged in biased abutment against at least one of said first and second protrusion elements (4, 4') in a direction perpendicular to said first or second longitudinal axis (20, 22) about which said at least one protrusion element (4, 4') is rotatably arranged.

The separation unit (1) according to claim 1 , wherein said contact element (42') is arranged so as to be non-rotatable about said first and/or said second longitudinal axis (20, 22).

The separation unit (1) according to claim 1 or 2, wherein said contact element (42') is arranged in connection to said first or second longitudinal axis (20, 22) opposing the at least one protrusion element (4, 4').

The separation unit (1) according to any one of the previous claims, wherein said contact element (42') is arranged so as to have a fixed position in relation to said first longitudinal axis (20) of said first shaft (2) when arranged in biased abutment against a protrusion element (4') of said second shaft (3).

The separation unit (1) according to any one of the previous claims, wherein said contact element (42') is arranged so as to have a fixed position in relation to said second longitudinal axis (22) of said second shaft (3) when arranged in biased abutment against a protrusion element (4) of said first shaft (2).

The separation unit (1) according to any one of said previous claims, said contact element (42') comprising an outer surface forming a pressure nip with said protrusion element (4, 4').

The separation unit (1) according to any one of the previous claims, wherein said at least one contact element (42') is forming a concave outer surface towards said at least one protrusion element (4, 4'), as seen in a plane perpendicular to said width direction (W').

8. The separation unit (1) according to any one of the previous claims, wherein said at least one contact element is forming a convex outer surface towards said at least one protrusion element (4, 4'), as seen in a plane perpendicular to said width direction (W').

9. The separation unit (1) according to any one of the previous claims, wherein said at least one contact element (42, 48) is forming a straight outer surface towards said at least one protrusion element, as seen in a plane perpendicular to said width direction (W').

10. The separation unit (1) according to any one of the previous claims, wherein said at least one contact element (42') is arranged in biased abutment against at least two protrusion elements (4, 4').

1 1. The separation unit (1) according to any one of the previous claims, wherein at least one first contact element is arranged in biased abutment against said at least one protrusion element (4) of said first shaft (2), and at least one second contact element (42') is arranged in biased abutment against said at least one protrusion element (4') of said second shaft (3).

12. The separation unit (1) according to any one of the previous claims, comprising a biasing means (34, 34') arranged to bias said contact element (42') towards said protrusion element (4, 4'), preferably said biasing means (34, 34') comprises a spring.

13. The separation unit (1) according to claim 12, wherein said first shaft (2) is

movably suspended, perpendicularly to said first longitudinal axis (20), and wherein said biasing means (34, 34') is arranged to bias said first shaft (2) towards said second shaft (3).

14. The separation unit (1) according to claim 13, wherein said longitudinal axis of said second shaft (3) is fixed.

15. The separation unit (1) according to any one of the preceding claims, comprising a first guiding part (40) fixedly arranged in relation to said first longitudinal axis (20) of said first shaft (2), and comprising a first guiding surface (42) for said web material.

16. The separation unit (1) according to claim 15, wherein said contact element (42') is formed by at least a part of said first guiding surface (42).

17. The separation unit (1) according to any one of the preceding claims, comprising a second guiding part (46), fixedly arranged in relation to said second longitudinal axis (20) of said second shaft (3), and comprising a second guiding surface (48) for said web material.

18. The separation unit (1) according to claim 17, wherein said contact element is formed by at least a part of said second guiding surface (48).

19. The separation unit (1) according to any one of the preceding claims, wherein said protrusion elements (4, 4') are disc elements.

20. The separation unit (1) according to any one of the preceding claims, wherein said protrusion elements (4, 4') are fixedly arranged with respect to said shaft (2, 3), respectively.

21. The separation unit (1) according to any one of the preceding claims, wherein said protrusion elements (4, 4') are rotatably arranged with respect to said shaft (2, 3).

22. The separation unit (1) according to any one of the preceding claims, wherein each of said first and second shaft (2, 3) is provided with a plurality of protrusion elements (4, 4') being spaced along said longitudinal axes (20, 22), preferably between two and eight protrusion elements (4, 4'), most preferred between four and six protrusion elements (4, 4')

23. The separation unit (1) according to claim 22, wherein each of said first and said second shaft (2, 3) has a central portion and peripheral portions in said width direction (W'), and wherein the spacing between said protrusion elements (4, 4') is greater in said central portion than in said peripheral portions, on at least one of said first and second shafts (2, 3), preferably both of said first and said second shafts (2, 3).

24. The separation unit (1) according to any one of the previous claims, wherein each protrusion element (4, 4') has a maximum radial extension from the respective longitudinal axis (20, 22), said maximum radial extension being between 5-50 mm, preferably 5-30 mm, more preferably 10-20 mm, or most preferably 12-18 mm.

25. The separation unit (1) according to any one of the previous claims, wherein said maximum widths of said protrusion elements (4, 4') are between 4-20 mm, preferably 5-10 mm, most preferably 6-8 mm.

26. The separation unit (1) according to any one of the previous claims, wherein said radial overlap length (L) is 2 - 40 mm, preferably 2-20 mm, more preferably 3-12 mm, or most preferably 4-10 mm.

27. A dispenser (7) for a web material comprising preformed lines of weakness, the dispenser (7) comprising a housing (10) defining a web material reservoir (70), and a dispensing opening (17),

characterised in that said dispenser comprises a separation unit (1) according to any one of the claims 1-26.

28. A dispenser (7) according to claim 27, comprising a guiding element (14)

determining a correct tension and path of said web material.