Abstract: A folding, or interfolding, unit, (100) for folding, or interfolding, a first and a second plurality of sheets of paper (105a, 105b) in a machine for converting paper, comprises a first and a second folding, or interfolding, counter-rotating rolls (1a, 1b) configured to rotate about a respective longitudinal rotational axis (110a, 110b) and providing a plurality of suction holes (11a, 11b, 12a, 12b). A vacuum generation device and a vacuum distribution device (40a, 40b) are, furthermore, provided for selectively putting into pneumatic communication the vacuum generation device with at least a row of the aforementioned suction holes (11a, 11b, 12a, 12b).

Abstract: A roll (1) for folding, or interfolding, a web, or sheet, of paper, (100) fed along an advancing direction in a paper converting machine, or similar machines, comprises a tubular body (10) configured to rotate about a longitudinal rotation axis (101), and having an external lateral surface (11) and an internal lateral surface (12) pneumatically communicating through a plurality of suction holes (3a, 3b) organized in a predetermined number of suction groups (60). Each suction group (60) comprises a predetermined number of close longitudinal rows (30a, 30b) of suction holes (3a, 3b) distributed along the tubular body (10). A suction chamber (20) is, then, provided arranged internally to the roll (1) for folding, or interfolding, and pneumatically connected to a suction device generating a predetermined vacuum level.

Abstract: A conveying unit (100) of a web, or sheet, of paper, or similar products, arranged to transfer along a transfer direction the web, or sheet, of paper, having a support (41) having a lateral surface (42) provided with at least one peripheral suction groove (43). A suction belt (45) is arranged to move along a closed trajectory (46) comprising the suction portion (44). The suction belt (45) is configured to air-tightly engage the suction portion and provides at least one through hole (47) arranged to be positioned at a respective suction portion (43) in order to cause a suction effect on the web, or sheet, and to transfer it from a first point P1 to a second point P2 of a production line of paper products. It is, furthermore, provided a driving device (60) configured to move the suction belt (45) with respect to the support (41).

Abstract: A paper converting or rewinding machine provides a cutting or perforation section, equipped with at least one blade arranged to work in combination with a stationary knife to provide the division of the web of paper into a plurality of sheets of measured length. The blade can be integral to a fixed support, or alternatively to a cutting roller that rotates about a longitudinal rotation axis. The blade(s) can be a perforation blade, or a cutting blade, with helical shape, and mounted to a perforation roller. The stationary knife can be mounted to a fixed roller. The blade performs a cutting, or perforation, of the web into sheets working in combination with the stationary knife. The blades and the stationary knifes are long substantially as the width of the paper. In particular, the blade has at least one weakened portion of determined size.

Abstract: Transversal cutting machine comprises feeding means (20) that supply a log of paper (15), for example hygienic paper, to a sawing station at which rolls or stacks (16) are cut off from the log (15) by a blade (25). During the cutting step the log (15) is held by a clamping device (1), divided in two parts (2, 3) arranged respectively upstream from and downstream of a slit (17) through which the blade (25) passes. In particular, the first part (2) and the second part (3) of clamping device (1) are movable relatively so that during the cut the log (15) is locally subject to traction at the same time of the blade (25) driven in the log. This way, during the cutting action of the blade (25) an opening (17) is created on the log (15) having a size at least the same as the thickness of blade (25) same. This makes easier the action of blade (25) since it reduces the friction produced between the blade (25) and the log (15).

Abstract: A method for separating two consecutive interfolded sheets, during the production of packages of paper products, even if there is present at least one tear-off line or “tab bond”. The sheets are fed in an interfolded way from interfolding rollers on a table by means of suitable folding arms. At a predetermined height of the stack a first plurality of separators, arranged along the length of the stack and at opposite sides with respect to it, are inserted in the same stack. This introduction divides the formed stack from the growing stack. Between the separators and the table a side of a sheet stretching board is introduced. The formed stack is then arranged between the table and the sheet stretching board. These are lowered vertically and move away from each other autonomously from the separators up to cause the disengagement of the growing stack from the formed stack.

Abstract: A folding and stacking machine of a web of paper has first and second feed lines. The machine also has a folding section with folding rollers having a linear folding speed, VP. The folding rollers are adapted to receive a plurality of sheets of length L that can overlap each other for a fraction Y of their length L and to fold them into a plurality of panels P. The machine also has rollers adapted to feed at the folding speed VP the series of cut sheets but not yet folded towards the folding rollers. The rollers are located at the confluence of the two sheet feeding lines. Upstream of the first and feed lines a single cutting section is provided to cut a web of paper that proceeds along a direction of movement at a speed V(1).

Abstract: Interfolding machine of sheet material for making a stack of interfolded sheets (1) equipped with cutting and transferring means, including, for example, a cutting roller 2 that operates the division of the web (10) into sheets (11) of determined length. The cut sheets (11), all having the same length, are carried along the machine up to a transfer roller (3) that transfers them to an “overlap” roller (4). In particular the cutting roller (2) has peripherally a first series of cutting blades (21a)-(21d) arranged at a first angular distance equal to 90° and a second plurality of cutting blades (21?a)-(21?c) arranged at a second angular distance equal to 120°. The length of sheets 11 is therefore achieved by the angular distance existing between the blades (21). In order to adjust the length of the sheets, or cut-off length, one selects the blades on the cutting roller (2) located at an angular distance corresponding to the desired sheet length.

Abstract: An interfolding machine for making a stack of interfolded sheets is adapted to move a first web (10a) of a material to be interfolded, for example paper, non woven fabric, or similar material, along a first direction (101a) and a second web (10b) along a second direction (101b). The two webs of paper (10a, 10b) are dragged by means of respective series of rollers (31-36, 37-45) up to respective cutting sections (20a and 20b) where cutting rollers (2a, 2b) are arranged that in combination with respective counter-cutting rollers (3a, 3b) cut the webs of paper (10a, 10b) in order to form respective sequences of sheets (11a, 11b). The sequences of sheets (11a, 11b) reach then an interfolding section (30) where the sheets (11a) obtained by the first web (10a) and the sheets (11b) obtained by the second web (10b) are folded and then interfolded according to a determined interfolded configuration.

Abstract: The sheets are supplied interfolded by two folding rollers, on a table on which they are piled up forming a stack. When the stack achieves a predetermined height a first plurality of separators and a second plurality of separators, arranged for all the length of the stack and from opposite sides are inserted into the stack to provide the disengagement of the stack already formed from a stack being formed, leaving between them of a wing of sheet hanging. The stack formed is then withdrawn quickly from the stack being formed by means of a table, which translates vertically, and is subject to a blow of air for stretching a possible last sheet. Then, the stack formed is left on a longitudinal conveyor belt located underneath. At the same time, a sheet stretching board moves under the stack of interfolded sheets, for all its length, for provisional support thereof and for stretching completely the wing hanging from the stack being formed with a portion of wing that exceeds sheet stretching board.

Abstract: An interfolding machine having a modular structure and with variable cut-off, including a frame having a first plate and a second plate, parallel to each other, interconnected by means of beams. Between the plates are arranged folding rollers, means for moving and an overlap roller. Each plate has a complementary shape to a respective upper plate, with upper plates connected by means of beams among one another. Between the plates, the cutting roller, the transfer roller and the cutter with the blade are arranged, such that a modular portion is formed removable independently from a main portion of the frame. Alternatively, the removable portion can include the only cutting roller and the cutter with the blade.

Abstract: A method for rewinding a web of sheet material for making a log wound on a core in a winding zone formed between an upper winding roller and a lower winding roller. Upstream of the winding zone a cradle is provided for feeding the core connected to the support of the lower roller and located beneath the upper winding roller. At least a portion of the cradle is movable with respect to the support of the lower roller and is capable of lowering or rising towards/away from the upper winding roller. For each step of feeding a core, the movable portion can be displaced from a first position of load of the core to a second position wherein the core contacts the upper roller. When the upper roller contacts the core for reaching the winding zone it moves first on the movable portion and then on a fixed portion of the cradle that is integral to the support wherein the axle rotates of the lower roller.

Abstract: Rewinding method and rewinding machine of a paper web (1) for making a log (2a) comprising a feed roller (3) for feeding the web (1) and a winding cradle (4) in which a log (2a) is formed winding the paper web (1) about a core (20). The latter is supplied into the cradle (4) by introduction means by a loading unit that draws the cores (20) from a chute guide. Upstream from the feed roller (3) a perforation roller (11) is provided that acts in combination with a counter-roller (12) to make a plurality of transversal tear lines (15?) on the paper web (1) forming a plurality of panels (16) connected to each other united by the tear line. Upstream from the means for introducing the core (20), furthermore, a gluing means is provided (50) for application of a measured amount of glue (55) on a determined portion of the paper web (1), in particular upstream from (Ia), down-stream of (Ib), or bridging the tear line or clean cut (15).

Abstract: Banding machine in which logs of sheet material are fed by a conveyor belt to a banding device that is adapted to band the logs with a banding web to form a tubular wrapper around the logs. The banding device includes a pusher operated by an actuator, which pushes the log into a channel, in which a packaging sheet is arranged, stretched in front of the log, as an obstacle. The conveyor belt and the packaging apparatus are arranged at different heights, respectively at a first and a second height (H1 and H2). A pusher is be provided, operated by a piston at the first height (H1), in addition to a pusher provided at the second height (H2), independent from each other. Further, a lifting member is provided, which receives the log from the first pusher and moves from the first height (H1) to the second height (H2).

Abstract: Folding and stacking machine (100) of a web of paper, or similar products includes a first sheet feeding line (201) and a second sheet feeding line (202). The machine (100) also includes a folding section (200) having a couple of folding rollers (7, 8) that work at a linear folding speed VP and are adapted to receive a plurality of sheets (11) of length L that are overlapped for a fraction Y of their length L and to fold them into a plurality of panels (P). The first and the second sheet feeding lines (201, 202) provide respective cutting sections of the sheets starting from webs of paper (10, 10?). These proceed respectively at a speed V1 and V2 with respect to the folding speed VP, where a first speed (V1) has a ratio X1 with respect to the folding speed VP, V2 and a second speed V2 second has a ratio X2 with respect to the folding speed VP. The first and the second sheet feeding lines (201, 202) can be operated selectively and independently, i.e.

Abstract: Interfolding machine of sheet material for making a stack of interfolded sheets (1) equipped with cutting and transferring means, including, for example, a cutting roller 2 that operates the division of the web (10) into sheets (11) of determined length. The cut sheets (11), all having the same length, are carried along the machine up to a transfer roller (3) that transfers them to an “overlap” roller (4). In particular the cutting roller (2) has peripherally a first series of cutting blades (21a)-(21d) arranged at a first angular distance equal to 90° and a second plurality of cutting blades (21?a)-(21?c) arranged at a second angular distance equal to 120°. The length of sheets 11 is therefore achieved by the angular distance existing between the blades (21). In order to adjust the length of the sheets, or cut-off length, one selects the blades on the cutting roller (2) located at an angular distance corresponding to the desired sheet length.

Abstract: An interfolding machine having a framework (1) comprising a first plate (20a) and a second plate (20b), parallel to each other, interconnected by means of beams (15, 25, 26). Each plate (20a or 20b), has a modular structure and comprises at least one lower portion (22a or 22b) and an upper portion (23a or 23b). The upper portions (23a, 23b) of the plates (20a, 20b) are connected by beams (25), whereas the lower portions (22a, 22b) are connected by relative beams (26, 15). The upper portion has a portion (5) removable independently from the framework (1). The removable portion (5) comprises cutting rollers (8), the rollers bringing a cutting tool (10) and folding rollers (9). The web conveying rollers (6, 7), conveying the paper along the direction of process are mounted on the fixed portion (24) of the upper portion (23) of the framework (1).

Abstract: An interfolding machine for sheet material for making a stack of interfolded sheets includes at least one web of material to interfold that is cut into sheets of predetermined length and rolls for partially overlapping the sheets in order to form an overlapped portion between two consecutive sheets. Interfolding rolls are also provided, adapted to produce the stack, as well as a conveyor adapted to convey the partially overlapped sheets in a zone set between the roll and the interfolding rolls. Further, the overlapping portion of the sheets is maintained constant through a plurality of belts and guides facing the belts so that between the belts and the respective guides a channel is formed for conveying the partially overlapped sheets.

Abstract: Banding machine for logs (1) of sheet material fed by a conveyor belt (2) to a packaging apparatus adapted to band it with a banding web (11) up to form a tubular wrapper around it. The packaging apparatus of the banding machine comprises a pusher (7) operated by an actuator (8), which pushes the log (1) in a channel (10) where a packaging sheet (11) is arranged stretched in front of the log, as an obstacle, along all the length of the machine through a passage (12). According to the invention, the conveyor belt (2) and the packaging apparatus (7) are arranged at different heights, respectively at a first and a second height (H1 and H2). Another pusher (14) can be provided, operated by a cylinder piston (15) at a first height (H1), in addition to the pusher (7) at the second height (H2), independent from each other. Furthermore, a lifting member (13) is provided, which receives the log (1) from the first pusher (14) and moves from the first height (H1) to the second height (H2).

Abstract: Banding machine for packaging logs (2) consisting of stacks of folded, overlapped or interfolded sheets, adapted to apply a banding web of paper or plastic film (8) for banding it on four longitudinal sides, through means for packaging (23). A glue gun (12), during the motion of the web in a direction orthogonal to the drawings, spreads a glue line (4) for all the length of the web (8), near the lower free wing (29). The packaging web (8) crosses the walls (13) at two gaps (26, 27), respectively upper and lower. This way, pushing the compressed log (2) in the channel (6), the packaging web (8) is arranged stretched in front of the log (2). Thus, by the pusher (7), the log (2) is pushed against the packaging web (8) well beyond the gap (26, 27), causing a kind of self-packaging, i.e. the log is wound for ¾ by the web (8) and leaving two free wings, (29, 30), of which the second has glue on it.