Disclosed herein is an extraction assembly for producing coreless logs. The extraction assembly includes a rectilinear transporter (20) of a log (11) wound about a disintegrable core (12), and a gripping device (30) for a portion of the core (12) projecting from the log (11), wherein the rectilinear transporter (20) has a transverse transport direction with respect to a log advancement direction of the log (11) along the converting line (100), and has an alternating transport direction back and forth in opposite directions, and the rectilinear transporter (20) contains a first portion for being received within the converting line (100), and a second portion for being placed outside the converting line (100), in which the second portion is aligned with respect to the first portion along the transverse transport direction. Also disclosed herein are a converting line containing the extraction assembly, and methods for producing coreless logs.

A method for producing a steel tube including the step of the manufacturing a steel tube having an inner tube wall, an outer tube wall, and a free tube cross-section enclosed by the inner tube wall, wherein after the manufacturing, the steel tube includes at least one contaminant on the inner tube wall. After the manufacturing of the steel tube, the inner tube wall is cleaned by introducing liquid or solid CO.sub.2 into the free tube cross-section, and of applying the liquid or solid CO.sub.2 onto the inner tube wall to remove the contaminant therefrom.

A rewinding machine winds web material into a log. The machine has a winding drum that is rotatable about a center axis and about which the web material to be wound is directed. A continuous loop is spaced from the winding drum and with the winding drum defines a nip through which the web material is directed when winding the web material into the log. The continuous loop is configured to move in a direction generally opposite of a direction of the winding drum at the nip. The continuous loop is configured to change speed relative to a speed of the winding drum during winding the web material into the log about a lead edge of the web material. The continuous loop is positionable relative to the winding drum at the nip to accommodate winding the web material into the log about the lead edge of the web material and to sever the web material.

Disclosed herein is an extraction assembly for producing coreless logs. The extraction assembly includes a rectilinear transporter (20) of a log (11) wound about a disintegrable core (12), and a gripping device (30) for a portion of the core (12) projecting from the log (11), wherein the rectilinear transporter (20) has a transverse transport direction with respect to a log advancement direction of the log (11) along the converting line (100), and has an alternating transport direction back and forth in opposite directions, and the rectilinear transporter (20) contains a first portion for being received within the converting line (100), and a second portion for being placed outside the converting line (100), in which the second portion is aligned with respect to the first portion along the transverse transport direction. Also disclosed herein are a converting line containing the extraction assembly, and methods for producing coreless logs.

A device (1) applies adhesive to cores which are used to produce a log includes a moving means (3) configured to cause at least one core (5) to advance along a feed direction (A) and a dispensing means (7) configured for dispensing an amount of adhesive (9) on the core (5). The dispensing means (7) are moveable along an application direction (B) substantially orthogonal to the feed direction (A) and are configured to selectively dispense an amount of adhesive (9) along portions (11) of the core (5) during movement along the application direction (B).

A rewinding machine winds web material into a log. The machine has a winding drum that is rotatable about a center axis and about which the web material to be wound is directed. A continuous loop is spaced from the winding drum and with the winding drum defines a nip through which the web material is directed when winding the web material into the log. The continuous loop is configured to move in a direction generally opposite of a direction of the winding drum at the nip. The continuous loop is configured to change speed relative to a speed of the winding drum during winding the web material into the log about a lead edge of the web material. The continuous loop is positionable relative to the winding drum at the nip to accommodate winding the web material into the log about the lead edge of the web material and to sever the web material.

A buffer (1) for paper cores comprises: a structure (2); a plurality of planes (5), arranged one over the other for accumulating cores; a mechanism (6) for feeding the cores associated with the planes (5) to provide the cores being fed; a first device (11) for transferring cores by the mechanism (6) to one of the planes (5), the first device (11) being interposed between the mechanism (6) and the planes (5) and being movable from one plane (5) to another in order to transfer the cores to the latter; a mechanism (16) associated with the planes (5) in order to discharge the accumulated cores; a second transferring device (21), interposed between the planes (5) and the mechanism (16), for transferring cores from the planes (5) to the mechanism (16), the second device (21) being movable from one plane (5) to another in order to empty the planes (5).

A device for rewinding and forming a paper roll in a rewinding machine comprising three rollers with parallel axes and perpendicular to the paper feeding direction, wherein two lower and upper winding rollers supported on a frame cooperate with a third swivel roller in pressure on a roll being formed, the paper being wound provided with a series of transverse piercing and weakening lines spaced apart according to regular intervals along their longitudinal development passing on the upper winding roller and finished roll exiting from an output opening defined between the lower roller and the third roller, the cores for the rolls fed one after the other by a conveyor, wherein mechanical tearing means are placed in the upper roller along its development facing towards the side of the paper facing towards the upper roller to positively act directly at a piercing line and cause the tearing of the paper.

The present invention concerns a device (1) for applying adhesive to cores for a log comprising moving means (3) configured to cause at least one core (5) to advance along a feed direction (A) and dispensing means (7) configured for dispensing an amount of adhesive (9) on said core (5).

According to the invention such dispensing means (7) are moveable along an application direction (B) substantially orthogonal to the feed direction (A) and are configured to selectively dispense said amount of adhesive (9) along portions (11) of the core (5) during movement along said application direction (B).

A buffer (1) for paper cores comprises: a structure (2); a plurality of planes (5), arranged one over the other for accumulating cores; a mechanism (6) for feeding the cores associated with the planes (5) to provide the cores being fed; a first device (11) for transferring cores by the mechanism (6) to one of the planes (5), the first device (11) being interposed between the mechanism (6) and the planes (5) and being movable from one plane (5) to another in order to transfer the cores to the latter; a mechanism (16) associated with the planes (5) in order to discharge the accumulated cores; a second transferring device (21), interposed between the planes (5) and the mechanism (16), for transferring cores from the planes (5) to the mechanism (16), the second device (21) being movable from one plane (5) to another in order to empty the planes (5).