Winding – tensioning – or guiding – Convolute winding of material – With cutting – perforating – or notching
Patent
1998-06-10
1999-09-14
Walsh, Donald P.
Winding, tensioning, or guiding
Convolute winding of material
With cutting, perforating, or notching
2425323, 242580, 156187, 156270, 156252, B65H 3508
Patent
active
059509589
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns a method in winding of a web, in particular of a paper or board web, in which method the web is wound onto a roll spool or equivalent through a nip between a roll or equivalent and the roll spool or equivalent.
BACKGROUND OF THE INVENTION
The machine reel produced in a paper machine is often slit into component webs in a slitter-winder, out of which component webs customer rolls or commercial rolls of desired width are formed. In the commercial rolls formed in the slitter-winder, automatic fixing of the cutting point, i.e. the tail end of the web, to the full roll after winding and the fixing of the initial end of the web to the new roll spool are today ever more important properties in further processing of the paper. This comes from the fact that, at present, ever fewer people work at the slitter-winder, and the roll changes, web threading, and other necessary operations require such a high proportion of the working time of said people that there is hardly time for manual fixing of the final ends/initial ends of the rolls by means of tape or equivalent. Moreover, rolls whose final ends have not been fixed produce difficulties on the conveyors. Likewise, it is a problem that a roll whose final end has not been fixed has time to become loose before packaging.
With respect to the prior art, reference is made to the FI Patent 91,054, in which a method and a device are described for automatic cutting and winding of a product web. In said paper, a solution is also suggested for fixing the end of the web, in which solution the web is weakened and strips of adhesive material are provided at the forward side and at the rear side of the weakening area. However, one problem in this prior-art solution, in particular with thicker paper grades, is ply separation of the paper, i.e. the paper is separated from the roll or spool in spite of the adhesive fixing. Ply separation of paper means that, while the paper is fixed by gluing onto the spool from one side, rigid paper and, especially, board grades tend to straighten themselves to their linear form present on the machine reel and are split starting from the end of the web, in which case the starting of winding can fail completely or a fold is formed on the bottom of the roll. It can also be difficult to find a correct degree of weakening of the web when paper grades of different strengths are run.
OBJECTS AND SUMMARY OF THE INVENTION
The object of the present invention is to provide a method in which the drawbacks of the prior-art solutions are not present and by whose means the ends of the web can be fixed automatically to the roll and to the spool, respectively, simply and reliably.
It is a particular object of the invention to create a solution that is suitable for use in connection with a slitter-winder when the slitter-winder slows down and stops for roll change.
The method in accordance with the invention is mainly characterized in that, in the method, when the roll that is formed on the spool becomes complete, a material strip with one adhesive face is fixed to the web at its edges transverse to the running direction of the web to fixing points so that the edges of the material strip are placed on the web at the fixing points at a distance between said fixing points in the running direction of the web that is shorter than the length of the material strip in the running direction of the web.
According to the invention, a material strip with one adhesive face is fixed to the face of the web, the length of said material strip in the running direction of the web being larger than the distance between its fastening points, and the web is cut off at a suitable point between the fastening points. After this, the material strip with one adhesive face is cut off so that one of its parts fixes the final end of the web to the complete roll and the other part fixes the initial end of the web to a new roll spool or equivalent.
According to the invention, the slitter-winder is stopped for the roll change, and the material
REFERENCES:
patent: 3734423 (1973-05-01), Kataoka
patent: 3784122 (1974-01-01), Kataoka
patent: 4775110 (1988-10-01), Welp et al.
patent: 5092533 (1992-03-01), Gangemi
patent: 5222679 (1993-06-01), Dropczynski et al.
patent: 5413656 (1995-05-01), Kuhnhold et al.
Rivera William A.
Valmet Corporation
Walsh Donald P.
LandOfFree
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