Winding – tensioning – or guiding – Convolute winding of material – With particular material connection to take-up
Patent
1996-07-25
1998-06-09
Nguyen, John Q.
Winding, tensioning, or guiding
Convolute winding of material
With particular material connection to take-up
242553, 242556, 242563, B65H 1928, B65H 1914, B65H 2100
Patent
active
057622833
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method for preparing the start of a material web of a stock roll in a roll exchanger, which method comprises the steps of: with the material web of a stock roll, winding-up body, and on the winding-up body and the stock roll, creating a new start of the material web of the stock roll.
BACKGROUND
Such a method for automatic preparation in a roll exchanger of the flying type is known from EP-A-547500. Before a new stock roll can be used in a roll exchanger, the stock roll has to be prepared. This preparation comprises unpacking the roll, when the packing material as well as rough, visibly damaged portions of the material web of the stock roll are removed. If desired, an adhesive layer is applied to the new start of the material web. In the known method, preparation takes place in the roll exchanger after the roll has been unpacked, the start of a material web of a new stock roll being fastened to a cylindrical winding-up body by means of, for example, suction onto a vacuum roller, and the damaged portion of the material web is wound up thereon until no further damage is observed. Next, two perforations are made transversely in the material web, an adhesive layer is applied to the top thereof, then the material web is torn off along one of the perforations by a relative movement between that portion of the material web which is wound up on the winding-up body and that portion of the material web which is still wound on the stock roll and the damaged wound-up portion is removed.
Reference is furthermore made in said publication to a possibility, not associated with the invention, whereby the damaged portion is fastened to an interchangeable winding-up sleeve during several preparation cycles, the start, of the material web of a stock roll, to be prepared being securely glued to said sleeve.
A disadvantage of the known method is that, in order to remove the damaged portion of the material web, the latter has to be cut away from the vacuum roller or the interchangeable winding-up sleeve, for which purpose an additional step and cutting device is required. Furthermore, two streams of waste occur in the roll exchanger, namely one of waste material, originating from the winding-up sleeve and one of old unwound stock rolls, the so-called surplus roll. A further disadvantage is that there is a risk of the material web not tearing accurately along the perforation which has been made, it being possible for this to give rise to further damage.
SUMMARY OF THE INVENTION
The object of the invention is to provide a method whereby the abovementioned disadvantages do not arise and which can be carried out in a simple and reliable manner. In particular, the object of the invention is to concentrate and dispose of the waste arising in the roll exchanger as a single stream of waste. A further object of the invention is to restrict the amount of waste removed from the material web.
The method of the abovementioned type according to the invention is characterized in that, prior to step a), a surplus roll of a stock roll is removed from a stock-roll holder and is incorporated in the frame of the web-takeup means as a cylindrical winding-up body for carrying out the subsequent steps a)-d) and an adhesive is applied to at least one of the material webs of the stock roll and/or the surplus roll.
In the method according to the invention, removal of damaged material from the stock roll, from which only the packing material has been removed, takes place in a position in the roll exchanger in which the stock roll can rotate.
The method according to the invention has a number of advantages with respect to the method according to the prior art. One advantage of the method according to the invention is that all the waste material, both the removed portion of a new stock roll as well as the surplus roll, is concentrated at a central point in the roll exchanger, namely on the surplus roll itself, as a result of which it is possible to dispose of it easily. Furthermore, the number of step
REFERENCES:
patent: 4131206 (1978-12-01), Kawada et al.
patent: 4802632 (1989-02-01), Fukuda et al.
patent: 5322230 (1994-06-01), Dylla et al.
Buchmeyer Theodoor Antonius
Schoonderbeek Hubertus Johannes
Bednarek Michael D.
Nguyen John Q.
Stork Contiweb B.V.
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