Abstract:
The winding mandrel (1) comprises a substantially cylindrical wall with expandable members for the torsional locking of tubular winding cores (A). At least one portion (11) of the wall is made of carbon fiber in a polymer resin matrix.
Abstract:
The machine comprises a forming spindle (4), around which one or more strips (S1, S2) of web material are wound; a winding unit (5) to wind the strips of web material around the forming spindle and form therewith a tubular article (T); a cutting unit (21) to cut the tubular article into single tubes. The machine also comprises at least one magnetic device to support the forming spindle to re- duce the flexural deformations thereof.
Abstract:
A core winder is disclosed for forming tubes from at least one helically wound strip (S1) of web material, comprising: a spindle (5), about which the strip or strips of web material are wound; a forming unit (9) comprising a belt (17) entrained about at least two pulleys (11, 15), at least one of which is motorized. The belt forms a loop (17S) about the forming spindle. The belt has a front face provided with a toothing cooperating with one of the pulleys, which is also toothed.
Abstract:
The embossing unit comprises in combination: a first support for a first embossing roller (7) and a second support for a first pressure roller (11), cooperating with the first embossing roller (7). The second support (9) presents two seats (9A, 9B) to receive and support the first pressure roller (11) in two different positions with respect to this support. The embossing unit also comprises a third support (19) for a second embossing roller (17). The third support can take at least two different operating positions. A fourth support (33) is provided to support a second pressure roller (35) suitable to cooperate with the second embossing roller (17) and suitable to take at least an operating position and an idle position. Finally, there is provided a fifth support (51) with a double seat to receive and support in two different positions alternatively a marrying roll or the second pressure roller (33).
Abstract:
The rewinding machine for producing logs of web material comprises: a winding unit (5, 7, 9); a feed path of the web material (N) towards the winding unit; a severing device to sever the web material upon completion of winding each log (L); and a glue dispenser (23, 25) to apply a glue to the web material. The machine also comprises a diverter member (31) disposed and controlled to temporarily divert the web material towards the glue dispenser.
Abstract:
Described herein is a method for obtaining an incision in an embossing roller using a hob, with a low-cost technique that enables protuberances P that are rounded on top to be obtained, 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 (P) is obtained by machining the cylindrical surface of the roller (1) that is placed between the tailstocks of the lathe using a hob that has teeth, the profile of which in cross-sectional view is complementary to that of the cross section of the protuberances illustrated in Figure 6. Figure 6 shows schematically in cross-sectional view a portion of the surface of the roller with protuberances in the machining step and a portion of the hob (10) with the teeth (D) that are generating the grooves that define the side faces of the protuberances . As may be noted in Figure 6A, the grooves between the teeth of the hob have a profile that is curvilinear in a cross-sectinoal view. With a double pass othis taccording two different inclinations of the surface of the roller the protuberances of Figure 5 and 6 are generated.
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.
Abstract:
The embossing and laminating device comprises: a central embossing cylinder (1), provided with a plurality of protuberances (1P); at least three pressure rollers (3, 4, 5) disposed along the periphery of the embossing cylinder (1) and provided with a yielding surface, cooperating with the embossing cylinder; at least three paths to feed one or more plies (V1, V2, V3, V4) between the central embossing cylinder and each pressure roller; at least a first gluing unit (7) disposed between two consecutive pressure rollers and cooperating with said central embossing cylinder.
Abstract:
A rewinding machine is described comprising: 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 said channel; an electrostatic device positioned along said 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 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.