Valmet Ab

Valmet Aktiebolag

Marco Capitani

Fabrizio Bartolini

The present invention relates to systems and methods for calculating the additional local stretching of a moving web through a converting process in order, during rewinding, to find the position of defects in the web that were identified during winding and stopping the web with the web defect close to or at a defect correcting station. The method comprises, during rewinding of the web, the steps of detecting position markers (PM(n)) applied during winding of the web (), measuring the distance between the position markers, calculating the additional local stretching between the position markers occurring during rewinding, applying the calculated additional local stretching to the known position of a following web defect to determine an estimated position of that web defect in the rewinding web. A method for correcting a web defect comprises the step of subsequently stopping the web with the web defect at, or close to, a defect repairing station ().

System and methods for the calculation of additional local stretching in a web

A device and method of winding a web (W) of tissue paper or a non-woven material onto spools () to form a succession of web reels () on the spools () wherein the force in the winding nip () is measured and, as the diameter of the web reel () grows, the spool () on which the web reel () is wound is moved during winding along a horizontal plane such that, in the horizontal direction, the distance between the first supporting drum () and the spool () increases, and the second supporting drum () is moved vertically downwards to match the increasing size of the web reel () while maintaining contact with the web reel () to such an extent that a nip force between the web reel () and the second supporting drum () is maintained, and the first supporting drum () is moved vertically downwards as the diameter of the web reel () grows and moved to such an extent that the measured nip force in the winding nip () remains substantially at a set value or within the range of a predetermined upper and a predetermined lower value.

Method and a machine for winding a web onto spools to form a succession of web reels

The invention relates to a method and a system for moving and labelling reels (R, R, R, R, . . . R) of a web material such as paper or nonwoven in which each reel has a central core piece () which is hollow and around which the web material is wound. A robot arm () is inserted into the central core piece () of at least one reel (R) and is then used to move the (R) from a first position (P) to a second position (P) and to fix an inner label () onto the central core piece (). According to the invention, the inner label () is placed on the robot arm () before the robot arm () is inserted into the central core piece () and the robot arm () is used both to fix the inner label () to the central core piece () and to move the at least one reel (R).

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Lucca, Italy

Marco Capitani