Winding – tensioning – or guiding – Convolute winding of material – With particular drive
Patent
1997-10-28
2000-07-18
Walsh, Donald P.
Winding, tensioning, or guiding
Convolute winding of material
With particular drive
2424131, 2425421, B65H 1814
Patent
active
060894962
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is related to a system (process and device) in order to get a perfect winding structure during the winding of web-like products especially made of paper to produce at least one wound paper web roll on a winding machine, with a pair of drums for supporting and starting the rotation of at least one wound paper web roll which is positioned in a winding bed made by the supporting drums, at least one of which preferably comprises an elastic flexible surface such as for example, a rubber cover. There are cooperating means, comprising a tensioned incoming traveling paper web, torque differentiation between the supporting drums and a rider roll engaging web roll being wound, all controlled by a computer which coordinates the elements of web tension, torque on the support drums and nip load provided by the roll to change the tensile stress remaining in the wound part.
2. Description of the Prior Art
In the above mentioned winding machines known in the art, the former supporting drums did not have an elastic flexible surface. Then, the winding structure could be influenced in such a way that the distribution of weights on the supporting drums was different and variable during the winding process and the pressure provided by the rider roll was dependent on the diameter of the roll, and was variable as well. Typically, the load on the supporting drum roll that was not wrapped by the web was linearly decresed depending on the increasing diameter of the roll, whereas the load on the first supporting drum in the winding direction (i.e., the so-called back drum) was linearly increased. The initial and final load values were controllable. It was typical as well that the load exerted by the rider roll to the web roll at first was increased according to the diameter of the roll, then decreased and did not exist any more at a defined diamter of the roll. The load itself was changeable.
It was typical as well that the tension exerted on the web that had to be wound was constant-independent of the diameter of the roll. Thus, the roll qualities of conventional two-drum winders, the supporting drums of which had a basically unflexible surface, could be improved.
The winding parameters did in no way take into account the friction values between the web and the supporting drums. Thereby, the forces exerted on the supporting drums and to the rider roll sometimes could not be transferred to the web. As a consequence slippage occured with respect to the web and the winding structure of the roll became insufficient.
The two-drum winders with at least one supporting drum with an elastic flexible surface (softnip principle) that were introduced in the market in the meantime were not successful with respect to the means for changing the wound tension of the web.
DE-GM 87 08 849 discloses a winder with two parallel drums and a rider roll that can be tilted as a whole to control the nip pressure. At the beginning of the winding process the rider roll exerts high pressure on the winding roll starting to build up. A tight core is obtained by this pressure, and also a positive speed differential between the drums and a corresponding back tension. During the following winding process the pressure of the rider roll is reduced. The back tension and the tilting of the whole winder is used to control the quality of the wound paper web rolls, i.e. the hardness. It is possible to provide the drums, especially the front drum with different coatings, i.e. a rubber coating.
A method for controlling the hardness of a winding roll by application of a different torque on back and front drum is disclosed in DE-A1-29 32 396. Hardness and the difference of the driving electrical current to apply different torque at the two drums follow according to the diameter of the roll. Hardness and current difference are kept at a constant value during a first phase. Afterwards, these values are decreased linearly. During a third phase these values are kept at a constant lower level. The first phase may
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"Emphasis On Better Rolls Means More Attention to Roll Structure", G. Forsberg, Paper Trade Journal Apr. 28, 1969, pp. 36-39.
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Beloit Technologies Inc.
Campbell Raymond W.
Mathews Gerald A.
Rivera William A.
Walsh Donald P.
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