Abstract: An apparatus for producing wrapped slip tubes from ribbon material (3), which consists of metal at least in part, comprising a profiling device (4) for forming seam edges (3a, 3b) of the ribbon material (3), at least one guiding surface (6a) for guiding the ribbon material (3) provided with the seam edges (3a, 3b), a bending device for deforming the ribbon material (3) into a helical partial surface of a cylindrical shell by of a deforming surface (7), a seam closing device (12) for closing the seam edges (3a, 3b) when inserted into one another by pressing them together, and a cutting device (15) for cutting produced tube portions off. Since the deforming surface (7), and preferably the at least one guiding surface (6a) also, comprises a contact surface of plastic material, pollution and damages of the tube can be avoided when producing it.

Abstract: The invention relates to a folding machine for producing folded seam connections between partial surfaces (38a) consisting of flat material closed in a tubular form. The inventive folding machine comprises a machine stand (2a, 2b, 2c), a fixed wheel (3), a pressing wheel (4) which is able to move in relation to said fixed wheel (3), and a closing plate (3) which is displaceable in relation to said pressing wheel (4) and which is arranged on a first bearing part (14) in such a way that it can turn. The folding machine also comprises a guiding device (17, 18) by which means the first bearing part (14) swings forward between a final release position and a final pressing position. During the movement between these two final positions, the distance between the edge areas of the closing plate and the pressing wheel (4) which project against the fixed wheel changes, as does the orientation of the closing plate (5).