Machine and method for winding reels of web material

Abstract

The rewinding machine comprises: a first winding member (3) and a second winding member (9) defining a winding cradle (19); a winding rod inserter (25) for introducing a winding rod (A1; A2) in the winding cradle (19) to wind a reel (B1) of web material (N) on said winding rod. The inserter (25) is arranged and designed for introducing the winding rod (A2) against the first winding member (3) towards the winding cradle (19) and the second winding member (5) is designed and arranged to allow a previously formed reel (B1) to be unloaded from the winding cradle (19).

Description

TECHNICAL FIELD [0001]The present invention relates to winding or rewinding machines for producing rolls or reels of web material, such as paper, tissue paper, non-woven fabric and the like. The invention also relates to improvements to the winding methods for producing rolls or reels of web material.STATE OF THE ART [0002]In the paper converting industry and in other continuous web material processing industries there is the need for producing reels or rolls of wound web material constituting intermediate products for subsequent converting operations. In the paper converting field, in particular, it is provided for a single or multiple ply of cellulosic material, for example tissue paper, to be unwound and wound again on reels. For producing large diameter reels, designed to be subsequently unwound and rewound in small diameter logs that, cut orthogonally to their axis, producing single rolls for final consumption, start-stop rewinding machines are used, i.e. machines wherein the f...

AI Technical Summary

Benefits of technology

The present invention provides a new rewinding machine and a new winding method that overcomes, wholly or partially, one or more drawbacks of the known machines. The machine includes two winding members and a system of rollers to control the reel diameter increase. The inserter is designed to introduce the winding rod against the first winding member and allow a previously formed reel to be stopped and unloaded. The second winding member is designed to control the unloading and winding of a new reel simultaneously, which reduces the machine's feed speed. The speed reduction is substantially lower than in other known machines, which increases productivity. The pitch of the winding members can change from a steady-state speed to an exchange speed and the reel can be brought to a reduced speed to facilitate the severing and starting of a new reel. The rotation speed of the first reel can be reduced by slowing down the second and fourth winding rollers. The winding method includes steps of forming a loop of web material and holding it between the first and second winding rods while causing the severing of the web material.

Problems solved by technology

These start and stop cycles entail production losses as well as stresses in the production line.

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