Abstract: The winding mandrel includes a substantially cylindrical wall with expandable members for the torsional locking of tubular winding cores. At least one portion of the wall is made of carbon fiber in a polymer resin matrix.

Abstract: A rewinding machine for producing logs of web material is described which includes a winding unit; a feed path of the web material towards the winding unit; a severing device to sever the web material upon completion of winding each log; and a glue dispenser to apply a glue to the web material. The machine also includes a diverter member disposed and controlled to temporarily divert the web material towards the glue dispenser.

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 device includes a feed path for the products, along which the products move forward, divided into single packs with the interposition of at least one separator finger between one pack and the next; an oscillating support to receive packs of products and tip them onto a conveyor below; a front retaining element, which can be inserted and removed with respect to the feed path of the products to frontally retain the pile of products while the oscillating support performs an oscillation movement and deposits a pack on the conveyor below. The front retaining element is inserted in a space formed between the first and the second pack of the pile. The space is obtained by oscillating the support downwards. The oscillating support moves downwards by a first downwards angular movement and a second angular movement.

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 cutting machine includes pairs of coaxial blades to simultaneously cut two rolls for each cutting cycle.

Abstract: The rewinding machine includes a winding system and a feed path for a web material towards the winding system. Along the feed path is a channel for insertion of the cores and an interruption member which acts on the web material.

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: A method is described for obtaining a coreless roll (R) of web material with a first portion of web material forming an inner nucleus (R1) of said roll and a second portion of web material (R2) wound around the outside of said nucleus. The two portions (R1, R2) can be separated from one another and, for said purpose, an interface or discontinuity is created in at least one turn of the web material forming the roll, between said inner nucleus and said second portion of web material, so as to facilitate the extraction of the inner nucleus from the outer portion of the roll.

Abstract: The rewinding machine includes a weakening device for weakening the web material along a substantially transverse weakening line, along which the web material is severed at the end of the winding of a log. The weakening device is controlled so as to generate the weakening line in a manner synchronized with the completion of winding of the log.

Abstract: The device comprises at least a continuous movable flexible member (23) carrying a series of contact members (29, 29A, 29B) for the products (R; R1; RN) aligned with one another. A section of the movable flexible member is devoid of said contact members to allow the trimmings (Rc, Rt) to fall. At least a longitudinal supporting element (21) of the products (R; R1, RN), is also provided, parallel to the movable flexible member, the reciprocal position of said flexible member and of said longitudinal element being such that the products advance in contact with the contact members (29, 29A, 29B) of the flexible member and with the longitudinal element. A pusher (11) inserts the series of products with the respective trimmings between the flexible member and the longitudinal supporting member. The flexible member (23) is controlled with a variable speed to carry the section thereof devoid of contact members time by time to the level of the head and tail trimmings (Rc; Rt) of two consecutive series of products.

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.

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 machine for producing tubes includes a winding spindle around which strips of weblike material are wound to form the tube, which is made to advance along the spindle; a device for supply and winding of the strips around the spindle, and at least one knife for cutting lengths of the tube being formed. The knife is provided with a reciprocating movement parallel to the spindle. There is moreover envisaged a counter-knife within the tube being formed, provided with a movement of translation synchronized to the movement of translation of the knife. The counter-knife is magnetically constrained to a mover member, which transmits the motion to the counter-knife.

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 rewinding machine is described including: a path for feeding the web material towards a winding system; interruption members to interrupt the web material at the end of winding of a log; a core insertion channel, defined by a rolling surface and a movable member; a core feeder to insert winding cores in succession in the channel; an electrostatic device positioned along the channel to electrostatically charge the winding cores and/or the web material thus causing, due to the electrostatic charges, reciprocal adhesion of the core and initial free edge of the web material obtained by interruption of the material at the end of winding of each log.

Abstract: The rewinding machine includes a path for insertion of tubular cores; a winding cradle; a first moving member designed to be in contact with the web material to be wound; a rolling surface forming, with the first moving member, a channel for passage of the tubular cores; and an insertion device to insert the cores in the channel. At the inlet of the insertion channel there is a second moving member, opposed to the first moving member, the core insertion path passing between the first and the second moving members. The two moving members are arranged at a distance such that a core inserted between them is in contact with the second moving member and with the web material entrained around the first moving member.

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: The rewinding machine includes a winding system and a path for feeding a web material towards said the winding system. Along the feed path at least one suction member is positioned to temporarily obstruct feeding of the web material and cause interruption thereof at the end of winding of each log.

Abstract: The machine for producing tubes includes a winding spindle, around which strips of weblike material are wound to form the tube, which is made to advance along the spindle; a device for supply and winding of the strips around the spindle, and at least one knife for cutting lengths of the tube being formed. The knife is provided with a reciprocating movement parallel to the spindle. There is moreover envisaged a counter-knife within the tube being formed, provided with a movement of translation synchronized to the movement of translation of the knife. The counter-knife is magnetically constrained to a mover member, which transmits the motion to the counter-knife.