Coating processes – Spraying – Moving the base
Patent
1996-01-19
1997-10-21
Beck, Shrive
Coating processes
Spraying
Moving the base
427421, 118302, 118324, 118325, B05B 1502, B05B 100, B05D 102
Patent
active
056794088
DESCRIPTION:
BRIEF SUMMARY
This application is a 35 U.S.C. .sctn.371 of International patent application No. PCT/FI95/00265 filed May 18, 1995.
The invention concerns a method for application of an adhesive or equivalent onto a moving material web, wherein the adhesive is applied by means of at least one applicator device through at least one nozzle onto the face of the material web to constitute an adhesive strip in the longitudinal direction of the material web.
Further, the invention concerns a device for application of an adhesive or equivalent onto a moving material web, which device comprises frame constructions, an adhesive-applicator head, a container space, and at least one adhesive nozzle.
Also, the invention concerns an adhesive nozzle for an adhesive-applicator device, comprising nozzle parts and parts for the supply of adhesive.
The machine reel produced in a paper machine is often slit in a slitter-winder into component webs, of which customer rolls or commercial rolls of the desired width are formed. Automatic fixing of the curing point, i.e. the "tail", of the commercial rolls produced in the slitter-winder after the winding as well as the gluing of the "initial end" of the web onto the roll spool are to-day ever more important properties in the finishing of paper. In the first place, this comes from the fact that, to-day, ever fewer persons are at work at a slitter-winder at a time, and the roll changes, threading, and other necessary operations take so much of the working time of these people that there is hardly time for manual fixing of the roll tails/initial ends by means of tape or equivalent. Moreover, rolls whose tails have not been fixed produce trouble on the conveyors, and it is a further problem that the roll has time to become slack before it is packaged.
Further, it has been a problem that with manual fixing, for example with so-called liner grades, it is not possible to fix the last layer by gluing across its entire width so that this layer operates as a wrapping or as a part of the wrapping during further transportation of the roll.
From the prior art, solutions are known by whose means attempts have been made to solve some of the problems described above by, in connection with the winder placed after the slitter, placing a device by whose means an adhesive is applied to the surface of the paper web for a certain period of time while the slitter slows down or stops for the roll change.
With respect to the prior art related to this, reference is made to the FI Patents Nos. 64,114, 65,554 and 69,617. In the solutions known from said patents, the application of the adhesive to the web surface is carried out by a tube of a width equal to the width of the machine, adhesive being extruded out of holes that have been drilled into the tube as uniformly spaced. It is a problem in this solution that an individual nozzle cannot be closed, in which case, when a slitting point coincides with said nozzle, adhesive may be carded to the wrong side of the web and from there onto the face of the roll of the winder. Further, in this prior-art solution, the points of starting and ending of the gluing are somewhat inaccurate, because the adhesive valve is placed outside the device far from the point of application of the adhesive. In this prior-art device, the cleaning of the adhesive-applicator head is problematic, and the arrangement of cleaning consumes an abundance of water. Moreover, the nozzles of the adhesive-application tube have been cleaned manually, which is laborious and takes a lot of time. Further problems in the application of adhesive have arisen from changes in the web angle, because, when the web angle is changed, the point of contact with the web is not placed facing the adhesive-feed opening of the adhesive-applicator device, but at the front or rear of said opening.
With respect to the prior art, reference is also made to the FI Patent No. 91,054, in which a method and a device are described for automatic cutting-off and winding of a product web. In said publication, a solution is also suggested for g
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Barr Michael
Beck Shrive
Valmet Corporation
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