Winding – tensioning – or guiding – Tension control or brake – Take-up coil drive control
Patent
1997-06-09
1998-12-15
Jillions, John M.
Winding, tensioning, or guiding
Tension control or brake
Take-up coil drive control
2421601, 2425414, 2425714, 242609, B65H 23195, B65H 1826
Patent
active
058487565
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a method for continuously winding up of a moving web in a winding machine for developing a soft intermediate layer between the winding core and the wound roll which has a high hardness. The invention furthermore relates to a device (winding machine) which is suitable for carrying out the method. Such a winding machine can either be a pure winding machine for webs of machine width or part of a roll cutting machine.
A winding machine is known, for instance, from German Patent DE PS 40 07 329 C2 or DE 44 01 959 A1. Another winding machine is described in European Patent Application EP 04 83 092 A1. Such a winding machine generally form the end section of a paper making machine or also of an off-line coating machines in order to bring the web of paper resulting there into the forms of a wound roll. During this process the paper web is wound onto a reel spool over its entire width. The reel spool is a roll-shaped winding core the diameter of which can be more than 0.6 m in the case of modern wide paper machines. For supporting the wound roll developing on the reel spool, the reel spool has bearing journals at its two ends by means of which journals it rests, for instance, on horizontal rails.
In other winding machines which, as a rule, are part of a roll cutter (see DE 38 32 601 and DE 32 21 929), longitudinally cut partial paper webs are wound onto sleeves. The length of each sleeve corresponds to the width of the corresponding partial paper web. The developing wound rolls are supported by at least one carrier roll; or a bed. For instance, a winding bed is formed of two carrier rolls or there are two winding beds formed of three carrier rolls. In addition, guide stands can be present and, a clamping head on each guide stand engaging into the corresponding sleeve.
The winding process is extremely important in paper making since at times there is the danger that paper which was up to that point produced without defects becomes so impaired upon winding that parts of a wound roll cannot be sold. The winding defects include so-called shiners, folds and tears. They are predominantly caused due to the fact that it is desired to create wound rolls of the greatest possible diameter and correspondingly high weight.
These winding defects are presumably produced as follows. When the paper web is being wound onto a reel spool and the wound roll has reached about 60 to 90% of its complete diameter, the high weight forces cause relative displacements of several layers of paper with respect to each other so that defective places result due to the sliding friction between the paper layers. Such defects occur mainly in the core region of the wound roll and therefore approximately in the region up to 25% of the layer thickness wound onto the reel spool. When a complete wound roll is later on unwound and these defective places become visible, the remaining paper web is cut off and becomes waste. For this reason, time and again there is an undesired loss due to waste.
Numerous theories exist as to how one can produce a wound roll which is free of defects. One theory, for instance, states that the winding hardness is to drop from a high initial value to a lower end value (see for instance DE 40 07 329 C2). It is the object of this method to wind the core region of the wound roll from the very start so tightly onto the reel spool that it is stiffened by the paper layers and this avoids the defective places which result for instance from sagging of the reel spool. This, however, may overstretch the web, possibly even tear it, and thus become useless. It has also been attempted to solve this problem by using reel spools of very high flexural stiffness (i.e. having a particularly large diameter), but frequently without success.
In accordance with JP-A-4-89746, a relatively slight winding hardness is produced at the start; then, it gradually increases to a maximum value at which the winding is finally completed.
In order to influence winding hardness, two parameters are avail
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Beisswanger Rudolf
Boeck Karl-Josef
Madrzak Zygmunt
Rueck Karl
Schettler Ulrich
Jillions John M.
Voith Sulzer Papiermaschinen GmbH
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