Abstract: An unwinder (1) of rolls (B1, B2) including a bearing structure (3) and two pairs of arms (11A, 11B; 13A, 13B) supported movable on the bearing structure (3). The unwinder further includes a splicing machine (31). The bearing structure (3) includes a base (5) and an upright (7) extending from the base, on which a cross member (33) is supported. The cross member (33) includes an intermediate portion (33A) rigidly bound to the upright (7) and a pair of lateral supports (33B, 33C) adapted to assume at least one operating position and one non-operating position, with respect to the inter-mediate portion (33A) of the cross member (33).

Abstract: An arm (5; 5A, 5B) for an unwinder (1) for unwinding rolls (B) is disclosed. The arm includes an axial engaging member (11) for engaging the rolls (B). The axial engaging member (11) has a shaft (11.3) supported by at least two support bearings (15, 17) mounted on the arm (5; 5A, 5B), so as to rotate around a rotation axis (A-A). A brake (23) is also provided, adapted to act on the shaft (11.3). The brake (23) is at least partially arranged between the two support bearings (15, 17).

Abstract: The hot plate (11) includes an upper plate (61) joined to a lower plate (63) along respective sides parallel to each other. A heat transfer fluid circulation chamber (65) is defined between the upper plate (61) and the lower plate (63), with at least a first inlet (83) of the heat transfer fluid and at least a first outlet (87) of the heat transfer fluid. The lower plate (63) has two downwardly bent edges (63.2), extending along the sides of the upper plate joined to the lower plate. Stiffening ribs (79) are joined to the lower plate (63), along the heat transfer fluid circulation chamber, and to the downwardly folded edges (63.2s) of the lower plate (63).

Abstract: The method includes the step of pulling the corrugated board along hot plates by means of an upper flexible member and a lower flexible member driven by two electric motors. By at least one electric parameter of the drive motor of the lower flexible member, the correct operation of the traction device and in particular the correct ratio of the linear feeding speeds of the two flexible members is checked. The method provides an iterative check of the controlled electric parameter and a possible correction of the speed of the flexible members to maintain the desired speed ratio.

Abstract: The plant includes at least one single facer, having a supporting structure, adapted to receive a corrugating unit provided with a first corrugating roller and a second corrugating roller meshing with each other. The plant also includes a magazine having a plurality of seats for receiving corrugating units and movable along a first guide. Associated with the single facer there is provided a shuttle movable between the single facer and the guide of the magazine, adapted to transfer corrugating units from the single facer to the magazine and vice versa.

Abstract: The device includes a hollow cutting roller with a blade attached to the outer surface of the hollow roller. A stationary shaft is also provided, arranged inside the hollow roller and coaxial therewith. The stationary shaft is connected to a supporting structure and the hollow roller is rotatably supported onto the stationary shaft. A motor drive is provided to rotate the hollow roller around the stationary shaft. The hollow roller is supported onto the stationary shaft by at least a hydrostatic bearing arranged in an intermediate position between the ends of the stationary shaft.

Abstract: A single facer including a first corrugating roller with a first rotation axis and a second corrugating roller with a second rotation axis. The two corrugating rollers form a corrugating nip, through which a paper sheet passes. The single facer also includes a pressing member, co-acting with the second corrugating roller and forming a pressure nip therewith, as well as a glue applicator co-acting with the second corrugating roller. With the second corrugating roller a suction box is associated, extending approximately parallel to the second rotation axis of the second corrugating roller and defining a suction area around the second corrugating roller. A series of laminar members, each of which is inserted in a respective one of the annular grooves of the second corrugating roller, are arranged between the pressing member and the first corrugating roller and extend in the respective annular grooves towards the suction box.

Abstract: A conveyor device for conveying a single face corrugated web on a bridge is disclosed. The conveyor device includes a lower guide roller, around which the single face corrugated web is guided. The conveyor device further includes an upper pinching and conveyance nip formed by a pair of nip members in pressure contact with one another. At least one of the nip members is motor-driven. The pinching and conveyance nip is configured to pull the single face corrugated web upwards from the lower guide roller.

Abstract: The plant includes a single facer for the production of a corrugated board. Video cameras detect any gluing defects or other defects of the corrugated cardboard. An image processing unit and a central control unit provide information about the detected defects and can act on one or more operating parameters of the plant.

Abstract: The splicing device for splicing a trailing edge of a first web material to a leading edge of a second web material includes members defining a feed path of the web material. The device also includes a first cutting member and a second cutting member, cooperating with the first cutting member. One of the two cutting members is provided with a movement transverse to the feed path of the web material, to move the cutting member from an operating position, in which it is in front of the other cutting member, to an idle position, withdrawn with respect to the feed path of the web material.

Abstract: A sheet stacker includes a sheet conveyor arrangement and a stacker platform. The sheets are fed in a sheet feeding direction on the stacker platform, to form stacks of sheets thereon. The stacker platform supports a stack conveyor configured and controlled to move in a conveyor direction to move the stack under formation such that sequentially piled up jobs are placed in an approximately centered position one with respect to the other according to the sheet feeding direction.

Abstract: The slitter-scorer machine includes a suction unit for removing trims cut by the cutting blades. The suction unit in turn includes a first pair of suction nozzles associated with a first set of cutting tools, and a second pair of suction nozzles, associated with a second set of cutting tools. The first pair of suction nozzles is adapted to suck trims generated by the first set of cutting tools and the second pair of suction nozzles is adapted to suck trims generated by the second set of cutting tools.

Abstract: The sheet stacker includes a sheet conveyor arrangement, configured for feeding a plurality of sheets and having a sheet discharge end, and a stacking bay. In the stacking bay sheets delivered by the sheet conveyor arrangement are formed into stacks. A stack conveyor is provided in the stacking bay and is movable in a conveyor direction parallel to a sheet feeding direction, according to which the sheets are fed from the sheet discharge end onto the stack conveyor. The sheet discharge end is configured and controlled such that it is gradually lifted during sheet stacking, in order to accommodate a growing stack of sheets being formed on the stack conveyor. A stop plate is positioned in the stacking bay above the stack conveyor and in front of the sheet discharge end of the sheet conveyor arrangement.

Abstract: The splicing device for splicing a trailing edge of a first web material to a leading edge of a second web material includes members defining a feed path of the web material. The device also includes a first cutting member and a second cutting member, cooperating with the first cutting member. One of the two cutting members is provided with a movement transverse to the feed path of the web material, to move the cutting member from an operating position, in which it is in front of the other cutting member, to an idle position, withdrawn with respect to the feed path of the web material.

Abstract: Disclosed is an unwinder with system for loading and unloading reels. The unwinder includes a rotating support with a rotation axis and provided with engaging members for engaging the reels. The unwinder further includes a positioning system for loading the reels onto the rotating support and an unloading system for unloading the reels from the rotating support. The positioning system includes a first conveyor for the reels and a pusher configured and arranged to push the reels from the first conveyor towards abutment members defining a pick-up position where the reel is taken by the rotating support. The positioning system and the unloading system are arranged at opposite sides of the rotating support.

Abstract: A sheet stacker including a sheet conveyor arrangement and a stacking bay, wherein sheets delivered by the sheet conveyor arrangement are formed into stacks; the stacking bay including a stacker platform. The stacker platform is provided with a vertical lifting and lowering movement with respect to a stationary supporting structure and is controlled to move downwards while a stack of sheets is formed thereon. The stacker platform supports a stack conveyor configured and controlled to perform at least an evacuation motion, to remove a completed stack from the stacking bay. The evacuation motion of the stack conveyor is oriented such that a completed stack is moved from the stacking bay onto an evacuation conveyor arranged under the sheet conveyor arrangement.

Abstract: A single facer including a first corrugating roller with a first rotation axis and a second corrugating roller with a second rotation axis. The two corrugating rollers form a corrugating nip, through which a paper sheet passes. The single facer also includes a pressing member, co-acting with the second corrugating roller and forming a pressure nip therewith, as well as a glue applicator co-acting with the second corrugating roller. With the second corrugating roller a suction box is associated, extending approximately parallel to the second rotation axis of the second corrugating roller and defining a suction area around the second corrugating roller. A series of laminar members, each of which is inserted in a respective one of the annular grooves of the second corrugating roller, are arranged between the pressing member and the first corrugating roller and extend in the respective annular grooves towards the suction box.

Abstract: The line comprises a feed path (P) of the web material (N) and, along the feed path, a transverse cutter (5) for cutting scraps (FS) from the continuous web material (N). The line includes a system for removing scraps of web material cut by the cutter. The system for removing scraps is fitted with a scrap accumulator member (21). The accumulator member (21) is movable in a direction generally parallel to the feed path (P) of the web material between: a position for receiving scraps, wherein the distance between the accumulator member (21) and the cutter (5) is such that scraps (FS) generated by the cutter (5) are collected by the accumulator member (21); and a standby position, at a distance from the cutter (5) such that scraps (FS) generated by the cutter are collected in a space (D) between the cutter (5) and the accumulator member (21).

Abstract: A sheet stacker includes a sheet conveyor arrangement and a stacker platform. The sheets are fed in a sheet feeding direction on the stacker platform, to form stacks of sheets thereon. The stacker platform supports a stack conveyor configured and controlled to move in a conveyor direction to move the stack under formation such that sequentially piled up jobs are placed in an approximately centered position one with respect to the other according to the sheet feeding direction.

Abstract: The sheet stacker includes a sheet conveyor arrangement, configured for feeding a plurality of sheets and having a sheet discharge end, and a stacking bay. In the stacking bay sheets delivered by the sheet conveyor arrangement are formed into stacks. A stack conveyor is provided in the stacking bay and is movable in a conveyor direction parallel to a sheet feeding direction, according to which the sheets are fed from the sheet discharge end onto the stack conveyor. The sheet discharge end is configured and controlled such that it is gradually lifted during sheet stacking, in order to accommodate a growing stack of sheets being formed on the stack conveyor. A stop plate is positioned in the stacking bay above the stack conveyor and in front of the sheet discharge end of the sheet conveyor arrangement.