Abstract: A knife holder (402) for a tube cutting unit is adapted to receiving a rotating tube fed out from a tube manufacturing device in a feed direction (316). The feed direction is parallel with the tube's longitudinal direction and the rotation takes place about an axis in the tube's longitudinal direction. The knife holder is adapted to following the rotating tube in the latter's longitudinal direction and to bringing a knife element into contact with the tube in a cutting direction and thereby creating in the rotating tube a cut at right angles to the longitudinal direction of the tube. The knife holder is further provided with at least a first bearing element (414) and a second bearing element (415) configured to engage in respective brackets (416, 417) in the tube cutting unit.

Abstract: The invention relates to a forming head (300) which shapes a raw material (6) to spirally seamed tube (2), whereby the internal profile of the forming head (300) is U-shaped, the forming head (300) has an inlet side and an outlet side and there are on the upper side of the legs (306, 308) of said U shape slide surfaces (312, 314) for the raw material (6) passing through said forming head (300).

Abstract: The invention relates to a knife holder (402) for a tube cutting unit (400), which tube cutting unit (400) is adapted to receiving a rotating tube (2) fed out from a tube manufacturing device (1) in a feed direction (316). The feed direction (316) for one length unit is parallel with the longitudinal direction of the tube (2). The rotation of the tube (2) takes place about an axis (310) in the longitudinal direction of the tube (2). The knife holder (402) is configured to be adapted to being movable via bearing elements (414) on the knife holder (402) which communicates with fastening elements (416) disposed on the tube cutting unit (400). The knife holder (402) comprises first and second shaft-bearing parts (410, 412) between which a shaft (408) supporting a knife element (404) with cutting edge (406) is fitted.