Abstract: A machine for producing a tubular product by helical winding of strips of web material including a mandrel and a winding member to helically wind the strips of web material around the mandrel is disclosed. To improve adhesion between the strips, at least one pressure member is provided, cooperating with the mandrel, disposed downstream or upstream of the winding member with respect to the direction of advance of the tubular product being formed on the mandrel. The pressure exerted by the pressure member promotes adhesion of the strips forming the product.

Abstract: The unwinding device to unwind reels of web material comprises: unwinding members (505; 525) to simultaneously unwind a first reel (B1) and a second reel (B2); a splicing device (563) to join together a first web material (N1) coming from the first reel (B1) and a second web material (N2) coming from the second reel (B2); at least one accumulation member (540, 541) to accumulate the web material delivered from the second reel before splicing with the web material delivered from the first reel; a first path (585) and a second path (589) for the web material delivered simultaneously from the first and from the second reel towards a machine downstream.

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 unwinding device comprises: a rotating element (3) with supports (13, 15) for at least two reels (B1; B2; B3); a splicing member (31, 33, 35) to join a first web material (N1) coming from an expiring reel (B1) to the initial free end (T) of a second web material (N2) wound on a new reel (B2). At least one mechanical member (21) is associated with each support (13; 15), to retain the initial free end (T) of the reel disposed on the support, to hold the initial free end until splicing of the two web materials.

Abstract: The folding machine comprises; a pair of counter-rotating folding cylinders (1, 3), each provided with at least one gripping member (43) to fold a continuous web material (N) in a zigzag manner; and a cutting member (60) disposed in front of the folding cylinders to cut the zigzag folded web material and divide it into two piles (M) of folded articles. Each gripping member is a suction member which retains the web material by suction at the level of the respective folding line.

Abstract: The embossed or printed web material article comprises at least two plies (V1, V2) of tissue paper joined together by gluing and forming at least one multi-ply sheet. The sheet has a principal pattern (D), embossed or printed, in a substantially intermediate position with respect to the surface of the article, and secondary embossed or printed patterns (U, V) of smaller dimensions arranged along the edge lines of the article and interrupted by said edge lines. FIG. 3 schematically shows an axonometric view of the embossing roller (21). The cylindrical surface of which is indicated with 21S. Defined on the surface of the roller are annular i.e. circumferential areas or bands (21C), along which protuberances are arranged to define an embossing pattern, which will be referred to hereunder as circumferential secondary embossing pattern. A longitudinal band (21L) is also represented on the cylindrical surface of the embossing roller.

Abstract: The rewinding machine includes a first winding roller; a second winding roller; a nip defined between the first and second winding rollers, through which the web material is fed; a roller surface, extending upstream of the nip in relation to the direction of feed of the web material and defining, with the first winding roller, a channel into which winding cores are fed, the channel having an inlet and an outlet; a feeder to feed winding cores into the channel; and a severing device to sever the web material upon termination of winding a log. The severing device is disposed to operate on the web material in a position upstream of the inlet end of the channel, in relation to the direction of feed of the web material. The first winding roller has suction openings on its cylindrical surface. Moreover, between the position in which the severing device operates and the inlet of the channel, a suction box is provided inside the first winding roller.

Abstract: The embossing device comprises at least one embossing roller (3) and at least one counter-roller (5) cooperating with said embossing roller. The embossing roller comprises an interchangeable sleeve (19) which can be constrained to two heads (13, 15) which engage the sleeve at the ends thereof.

Abstract: The interchangeable sleeve comprises: a substantially cylindrical outer surface (105A); a layer of hardened resin (R); a substantially conical inner surface for connection to a conical central core of the roller. The inner surface is formed at least partially of at least one inner component (102) having greater rigidity than said hardened resin. The inner component is constrained to the sleeve by means of said hardened resin.

Abstract: A method for producing an article made of a web material, comprising at least one ply, wherein a superabsorbent material in powder form is associated with said ply.

Abstract: The device comprises a system for unwinding a portion of the web material from the log R, and a system for rewinding the tail end on the log after application of an adhesive. Moreover, a folding member 21 is provided, to fold the tail end and form a fold of web material defining a portion for gripping and detaching the folded loose end from the roll.

Abstract: A method for producing logs (L1, L2) of web material (N) wound around tubular cores wherein the tubular core (A1-A4) is equipped with glue to secure the initial end of the web material and allow winding. Part of the glue applied to the tubular core is transferred to the web material (N) before it is severed upon termination of winding the log, to seal the final free end of the formed log.

Abstract: The rewinding machine comprises a winding roller (5) equipped with a moving axis to remain in contact with a log (R) being formed and allow the diameter of said log to increase. A member to control the action of said roller on the log (R) being formed is associated with the winding roller with moving axis. The control member is provided with a stop position that can be set to be reached before winding of the log (R) is completed. Winding of the log being formed is essentially completed without moving the axis of the winding roller with moving axis (5) in order to obtain a finished log always with a more or less constant diameter.

Abstract: The invention relates to a machine for producing tubular articles (T) by helical winding of strips of web material, comprising a spindle (4) and a winding member (7) to helically wind the strips (S1, S2) of web material around the spindle. To improve adhesion between strips pressure is applied to the overlapping turns of strips of web material by an ultrasonic generator (33).

Abstract: The sheet product, such as paper, wound in a roll, comprises at least two plies (V1, V2) joined together by gluing, at least one of which is embossed. The product has longitudinal bands or areas (1, 3) which are characterized by a different quantity of glue, with more glue in proximity to the edges.

Abstract: An embossing roller for processing a web material comprises a central axle (53) and a removable and interchangeable outer sleeve (51); the interchangeable sleeve has an essentially cylindrical outer surface provided with protuberances and/or cavities. The axle has radially expandable elements (61) to clamp the sleeve.

Abstract: The folding machine comprises a pair of folding rollers (1, 3) rotating about axes essentially parallel to each other and defining a nip (5) through which a web material (N) to be folded passes. Disposed on each of the folding rollers are folding members (61, 61A; 63, 63A) which form folds on the web material parallel to the axis of rotation of the folding rollers. For each folding roller (1, 3) a transferring device (11, 13) is also provided to transfer packs of products folded by the folding rollers towards an unloading area (9), which comprises a plurality of separating fingers (15) movable along a closed path, from an area of engagement with the folded products to an unloading area of the folded products. Each of the transferring devices extends inside an annular groove (1G, 3G) of the respective folding roller (1, 3).

Abstract: The storage unit comprises at least two flexible members (55), equipped with supports (57) for the products to be stored, extending and moving along respective parallel paths defined by a plurality of driving wheels (59, 63). The supports (57) project laterally in respect of the relative flexible member. In each of the paths, in proximity to at least one driving wheel, a transfer member (71) is positioned to receive the products from the supports located on a branch (55A) of the respective flexible member upstream of said driving wheel and transfer them to the supports located on a branch (55B) of said flexible member downstream of said driving wheel in respect of the direction of feed of the flexible members along the respective paths, so that the products follow a trajectory that by-passes said driving wheel.

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 frst 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: The rewinding machine comprises: a first winding roller (11) and a second winding roller (13) defining a nip (15) through which said cores are inserted and through which said web material (N) is fed; and at least one pair of motorized engaging members (57), to engage the ends of a winding core and transmit a rotational movement to the core during at least part of the winding cycle of each log. The engaging members and the first and second winding roller are produced and disposed so that the log being formed is in contact with said first and said second winding roller. Moreover, a third winding roller (17) is provided, defining a winding space with said first and said second winding roller, said third winding roller being movable to allow increase and completion of winding of each log in said winding space.