Winding machine having continuous loop and tension device...

Details Winding machine having continuous loop and tension device... Winding machine having continuous loop and tension device...

1999-10-21

2001-12-25

Rivera, William A. (Department: 3653)

Winding, tensioning, or guiding

Convolute winding of material

With particular drive

Reexamination Certificate

active

06332589

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a winding machine for producing at least one wound roll from a supplied material web, such as a paper or endless cardboard web, in which the material web or the web sections generated therefrom are each wound on a core formed by a tube or the like. The invention further includes a continuous loop encircling at least one winding roller and a tensioning device with at least one winding gap that regulates the winding tightness of the wound roll of material web.
2. Discussion of Background Information
The winding rollers used in the paper industry are in most cases manufactured from steel or gray cast iron. The so-called functional surface of this type of winding roller, i.e., where the roller sleeve contacts the wound roll, is generally covered with a hard coating. Current developments in paper manufacturing are now increasingly tending toward more sensitive paper, higher web speeds, and larger winding diameters. This can cause, amongst other things, air problems, such as the formation of bubbles, winding defects, too high a tension level that is nip-induced, and layer shifts. In order to counter these problems, winding rollers are more and more frequently covered with soft coatings. This type of winding roller is typically composed of a basic metal body and a coating that has either been vulcanized or glued onto it. However, a disadvantage of such winding rollers is that, amongst other things, the soft coatings have a relatively short service life. Furthermore, soft roller coatings are expensive and applying them is very time-consuming. For example, the residue of the old coating must be removed initially and appropriate preparations must be undertaken before the new coating can ultimately be applied. Apart from these disadvantages resulting from the requirement for a coating, the time needed to change a respective roller is normally also very great. Thus, at least one spare roller having the same coating must be made available.
As used herein, the term “soft” is meant to encompass a range of softness as described in Pussy & Jones (P&J). If expressed in terms of ranges, what is meant by the term soft is the range from about 80 P&J to about 105 P&J, more preferably from about 85 P&J to about 100 P&J, and most preferably from about 90 P&J to about 95 P&J. If, on the other hand, the term soft is expressed in terms of upper and lower values, the upper values are about 105 P&J, and they are preferably less than 105 P&J, more preferably less than 100 P&J, and most preferably less than 95 P&J. On the lower side, the lower values are about 80 P&J, and they are preferably greater than 80 P&J, more preferably greater than 85 P&J, and most preferably greater than 90 P&J.
In a paper machine known from DE-PS 51 988, the paper web is fed, amongst other things, through a roller press across whose upper press roller a continuous rubber blanket is fed. Another press roller is described in DE 35 01 635 A1, which incorporates a flexible press sleeve that is impervious to fluid, through which a supporting body that is positioned in a fixed or rotatable manner extends.
Nonetheless, these known rollers are not used to wind up a supplied material web or to re-roll an already finished wound roll.
SUMMARY OF THE INVENTION
A winding machine is provided, according to the invention, for producing at least one wound roll from a supplied material web. The winding machine includes a core formed by a tube, on which the material web is rolled into a wound roll, and at least one winding gap, which regulates the winding tightness formed between the core and the wound roll originating thereon. The winding machine disclosed herein also includes at least one winding roller, and at least one pre-tensioned continuous loop encircling at least one winding roller.
In the winding machine disclosed the core may be formed by a tube, a rod, or the like, and the material web may be a web of paper or of cardboard.
In this invention, the continuous loop may take two forms. The continuous loop may extend either essentially across the entire width of the winding roller, or there may be more than one continuous loop with each continuous loop extending only across a portion of the winding roller, and placed adjacent to each other to extend essentially across the width of the winding roller.
Additionally, the continuous loop may have various properties. The continuous loop may be either soft at least on its exterior or entirely soft and/or flexible. Further, the continuous loop may be in the form of either: a flat belt comprising an internal run layer, a tension layer, and an external outer layer with a soft coating; a V-belt, with a soft coating, within a circumferential channel; or an internal run layer and an external layer with a soft coating.
On the winding machine described, the continuous loop may have soft coatings, such as rubber, and the coating may have a structural surface or surfaces. The structural surface may be grooves, or it may be a soft porous coating. Further, the continuous loop may be covered with a soft rubber coating having embedded hollow spaces.
In this invention, it is contemplated that the tension of the continuous loop may be adjustable. The tension is adjusted by at least one tensioning device located within the continuous loop.
The winding machine described herein is further comprised of at least one winding roller, with a metallic sleeve, which serves as a main roll or a support roll to at least one core and wound roll.
The winding machine disclosed herein further comprises at least one moveable winding roller and at least one movable tensioning device, with both the winding roller and the tensioning device being jointly adjustable. In addition, a winding machine is also disclosed in which at least one stationary winding roller and at least one stationary tensioning device is utilized.
According to the invention, the winding machine may be used in a process for producing at least one wound roll from a material web. The process includes passing the material web over at least one pre-tensioned continuous loop encircling at least one winding roller, the material web being one of paper or cardboard, and regulating the winding tightness of the at least one wound roll with a winding gap between a winding roll and the material web or a core, comprising a tube. The process disclosed herein further includes winding the at least one wound roll on the core, wherein the tension of the at least one pre-tensioned continuous loop is adjusted by at least one tensioning device.


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