Abstract:
Method for producing cardboard tubes by winding a plurality of ribbons (U, L) onto a spindle (1), a preset number of the ribbons (U, L) being glued in correspondence of the lower or radial inner surface thereof, characterized in that a predetermined amount of supplementary quick setting glue is applied on the lower surface of the last ribbon (U) destined to be wound on the spindle (1), in proximity to at least a longitudinal edge (BU) of the ribbon (U) forming a corresponding stripe of quick setting glue (G) astride of a section (ST) of the same ribbon interested or intersected by a subsequent cutting action executed downstream of the spindle (1).
Abstract:
Apparatus for causing paper webs to tear off within rewinding machines, the web (2) being provided, at regular intervals, with transverse perforation which subdivide the web into sheets joined to each other but able to be separated in correspondence of said perforation lines, the apparatus comprising a device to cause the tearing of the web (2) upon the passage of a perforation line (p) which separates the last sheet of a log (RO) in the course of formation from the first sheet of the next log to be formed, characterized in that the tearing device is a pneumatic type device (SP) able to direct a jet of compressed air toward the line (p).
Abstract:
Apparatus for causing paper webs to tear off within rewinding machines, the web (2) being provided, at regular intervals, with transverse perforation which subdivide the web into sheets joined to each other but able to be separated in correspondence of said perforation lines, the apparatus comprising means to cause the tearing of the web (2) upon the passage of a perforation line (p) which separates the last sheet of a log (RO) in the course of formation from the first sheet of the next log to be formed, characterized in that the tearing means are of pneumatic type (SP) able to direct a jet of compressed air toward the line (p).
Abstract:
The invention refers to a rewinding machine and a method for producing logs of paper; the machine comprises means for feeding a continuous paper web (2) along a predetermined path, means for operating a series of discontinuous transverse cuts in order to subdivide the web (2) into portions of sheets of predetermined length to be separated by tear, means for feeding tubular cores (1) upon each of which a preset number of sheets is to be wound to form a log, a cores (1)-guiding channel (C) which extends between a cores (1)-feeding station (A) and a station at which a log (RO) is formed, the said channel (C) being delimited in part by a fixed guide (3) and in part by a roller (RA) which cooperates for the feeding of the paper (2); the machine comprises a device (4, 5; 32, 31) able to deliver predetermined amounts of glue within said channel (C), the said device including first and second means (4, 31; 5, 32) located and acting on corresponding preset points being located between the station (A) for feeding the cores (1) and the station for forming the logs (RO).
Abstract:
Apparatus for continually joining paper webs, comprising means able to compress the said webs (5, 6) onto an impression cylinder or roller (4) while the webs advance toward an outlet section of the apparatus, characterized in that said compressive means include a roller or cylinder (2) which exhibits a hard outer surface (20) supported by an underlying elastic surface (23).
Abstract:
An apparatus for reel replacement in machines for the production of reels of light-weight web material, of a type with a device for winding material onto a tubular core or rod and a device for feeding an unloaded rod (spool) intended to replace the reel. The apparatus has a surface (80) able to delimit, in cooperation with the surface of an unloaded rod (51), a channel (85) to which a jet of air produced by a plurality of nozzles (9) is directed.
Abstract:
A sail maneuverable through the rotation of a rolling and unrolling structure to which the sail is anchored along an anchorage edge. A sheath surrounds the rolling structure and engages the sail at opposite sides along a coupling line spaced from the anchorage edge. The sheath and that intermediate portion of the sail between the coupling line and the anchorage edge being shaped so that when the sail is unrolled the sheath stretches out, retaining the intermediate portion within the end zones unstretched, causing the sail to take a bellying or fat-sail arrangement. At the beginning of rolling, the sail is pulled back into the intermediate portion and progressively also into the end zones, thereby assuming a flat-sail arrangement.
Abstract:
Method for producing cardboard tubes by winding a plurality of ribbons (U, L) onto a spindle (1), a preset number of the ribbons (U, L) being glued in correspondence of the lower or radial inner surface thereof, characterized in that a predetermined amount of supplementary quick setting glue is applied on the lower surface of the last ribbon (U) destined to be wound on the spindle (1), in proximity to at least a longitudinal edge (BU) of the ribbon (U) forming a corresponding stripe of quick setting glue (G) astride of a section (ST) of the same ribbon interested or intersected by a subsequent cutting action executed downstream of the spindle (1).
Abstract:
Device for treating paper webs or plies, comprising a couple of overlapped rolls (2,3) for compressing a paper web or ply passing between them. Each of said rolls (2,3) features a fixed central shaft (20,300) supported by a corresponding holder (10,83) at its ends, on which shaft a tubular jacket is fitted, with the interposition of low-friction connecting members (21,310) which are positioned on opposite sides with respect to the center line of the fixed central shaft axis, so that said tubular jacket, which is destined to come into contact with the paper webs or plies to be treated, is free to rotate about its longitudinal axis.
Abstract:
Apparatus for causing paper webs to tear off within rewinding machines, the web (2) being provided, at regular intervals, with transverse perforation which subdivide the web into sheets joined to each other but able to be separated in correspondence of said perforation lines, the apparatus comprising means to cause the tearing of the web (2) upon the passage of a perforation line (p) which separates the last sheet of a log (RO) in the course of formation from the first sheet of the next log to be formed, characterized in that the tearing means are of pneumatic type (SP) able to direct a jet of compressed air toward the line (p).