Abstract: The embossing unit includes at least one embossing roller with a rotation axis and a substantially cylindrical surface with a plurality of embossing protuberances with linear extension; a pressure roller with a yielding surface; an embossing nip defined between the pressure roller and the embossing roller; a feed path of a web material extending through the embossing nip. Along the linear extension thereof the embossing protuberances have a variable inclination with respect to the rotation axis of the embossing roller and a variable cross section along the longitudinal extension of the embossing protuberances.

Abstract: The rewinding machine includes a first winding roller, around which the web material is guided, and defining at least in part a winding cradle; a support surface of the winding cores arranged to receive a winding core and to convey the core toward the winding cradle, the support surface defining with the first winding roller a feed channel of winding cores, a severing member of the web material, which can be inserted in the channel to sever the web material, the severing member interacting with the web material to cause severing thereof; a motor for controlling the severing member, the motor controlling the severing member modifying the speed of the severing member when it is positioned inside the channel.

Abstract: The machine includes a forming spindle around which one or more strips of web material are wound; a winding unit to wind the strips of web material around the forming spindle and form therewith a tubular article; and a cutting unit to cut the tubular article into single tubes. The machine also includes at least one magnetic device to support the forming spindle to reduce the flexural deformations thereof.

Abstract: The machine includes a spindle; a winding unit, cooperating with the spindle to wind one or more strips of web material about the spindle and form a tubular element; and a cutting unit with at least one discoidal cutting tool to divide the tubular element into tubes of a length which can be predetermined. At least one pressure element is associated with the cutting tool to compress the tubular element between the spindle and the pressure element adjacent to the cut performed by the cutting tool.

Abstract: A device is provided to produce an embossed multi-ply material, comprising: a first embossing-laminating unit (3) comprising a first embossing cylinder (5) equipped with first projections (5P) defining a first pattern, a first pressure roller (7) cooperating with said first embossing cylinder (5), a first laminating roller (9) and a first glue dispenser (11), disposed between said first pressure roller (7) and said first laminating roller (9); an embossing unit comprising at least a second embossing cylinder (25) provided with second projections (25P) defining a second pattern and a second pressure roller (27) cooperating with said second embossing cylinder (25); a first path (P1) through said first embossing-laminating unit (3); a second path (P2) for at least a second ply (V2) towards and through said second embossing unit (23); a third path (P3) for said third ply (V3).

Abstract: A method for obtaining an incision in an embossing roller using a hob to provide protuberances that are rounded on top and which improve the quality of the embossed material and reduce the wear of the mechanical components of the embossing units. The shape of the protuberances is obtained by machining the cylindrical surface of the roller placed between the tailstocks of the lathe using a hob that has teeth, the profile thereof being complementary to the cross-section of the protuberances. A portion of the hob with the teeth generates the grooves that define the side faces of the protuberances. The grooves between the teeth of the hob have a profile that is curvilinear in a cross-sectional view. With a double pass at two different inclinations of the surface of the roller, the protuberances of FIGS. 5 and 6 are generated.

Abstract: The gluing device includes a log feeding path that extends at least partially between a flexible conveying member and a feeding surface; and a log inserter that sequentially introduces logs between the flexible conveying member and the feeding surface. The inserter includes a flexible input member, provided with pushing elements for pushing single logs between the flexible conveying member and the feeding surface.

Abstract: The embossing unit includes in combination: a first support for a first embossing roller and a second support for a first pressure roller, cooperating with the first embossing roller. The second support presents two seats to receive and support the first pressure roller in two different positions with respect to this support. The embossing unit also includes a third support for a second embossing roller. The third support can take at least two different operating positions. A fourth support is provided to support a second pressure roller suitable to cooperate with the second embossing roller and suitable to take at least an operating position and an idle position. Finally, there is provided a fifth support with a double seat to receive and support in two different positions alternatively a marrying roll or the second pressure roller.

Abstract: The device for joining at least two plies of paper, in particular tissue paper, including a ply-bonding unit and moistening means to moisten at least one of the two plies before joining.

Abstract: A method is described for obtaining a coreless roll of web material with a first portion of web material forming an inner nucleus of the roll and a second portion of web material wound around the outside of the inner nucleus. The two portions can be separated from one another and, for that purpose, an interface or discontinuity is created in at least one turn of the web material forming the roll between the inner nucleus and the second portion of web material. This facilitates the extraction of the inner nucleus from the outer portion of the roll.

Abstract: To close the tail end (L) of the web material forming the log (R) there is provided mechanical ply-bonding between the tail end and a portion of the last turn of web material, preferably a portion forming a fold (F) projecting from the log.

Abstract: The embossing unit includes at least one embossing roller with a rotation axis and a substantially cylindrical surface with a plurality of embossing protuberances with linear extension; a pressure roller with a yielding surface; an embossing nip defined between the pressure roller and the embossing roller; a feed path of a web material extending through said the embossing nip. Along the linear extension thereof the embossing protuberances have a variable inclination with respect to the rotation axis of the embossing roller and a variable cross section along the longitudinal extension of the embossing protuberances.

Abstract: The device for joining at least two plies of paper, in particular tissue paper, including a ply-bonding unit and moistening means to moisten at least one of the two plies before joining.

Abstract: To close the tail end (L) of the web material forming the log (R) there is provided mechanical ply-bonding between the tail end and a portion of the last turn of web material, preferably a portion forming a fold (F) projecting from the log.

Abstract: The device for joining at least two plies of paper (V1, V2), in particular tissue paper, comprises a ply-bonding unit (9) and moistening means (11) to moisten at least one of said two plies before joining.

Abstract: The rewinding machine includes a first winding roller, around which the web material is guided, and defining at least in part a winding cradle; a support surface of the winding cores arranged to receive a winding core and to convey the core toward the winding cradle, the support surface defining with the first winding roller a feed channel of winding cores; a severing member of the web material, which can be inserted in the channel to sever the web material, the severing member interacting with the web material to cause severing thereof; a motor for controlling the severing member, the motor controlling the severing member modifying the speed of the severing member when it is positioned inside the channel.

Abstract: A storage unit for tubular winding cores is described, which includes an entrance, an exit and an accumulation area between the entrance and the exit. In the accumulation area, a feeding path is provided for the tubular winding cores, formed by feeding channels overlapping and connected by descending branches arranged for falling due to gravity from one feeding channel to another feeding channel therebelow. The tubular winding cores gather along the feeding path, arranging themselves in contact one with another.

Abstract: The cutting machine includes at least one log feed channel; a cutting station along the feed channel, with at least one cutting blade for dividing each, log into individual rolls plus front and rear trims; a log feed device along the feed channel, including at least one rear member for pushing the logs to be cut, movable along the feed channel to push each log through the cutting station. The feed device also includes at least one front member for engaging with the log to be cut, arranged and controlled so as to engage frontally with each log, or series of rolls obtained after the log has been cut, for at least a part of its travel along the feed channel.

Abstract: A method is described for obtaining a coreless roll of web material with a first portion of web material forming an inner nucleus of the roll and a second portion of web material wound around the outside of the inner nucleus. The two portions can be separated from one another and, for that purpose, an interface or discontinuity is created in at least one turn of the web material forming the roll between the inner nucleus and the second portion of web material. This facilitates the extraction of the inner nucleus from the outer portion of the roll.

Abstract: A rewinder machine for the production of rolls of web material is described, comprising: a winder unit (3, 5, 7); a path for delivering the web material (N) to said winder unit; a system for continuously feeding said web material into said winder unit; a distributor (31) of a sheet material (F) for wrapping the rolls formed by said winder unit, installed and operated so as to deliver a length of sheet material to said winder unit on completion of the winding of each roll without stopping the forward feed of the web material.