Winding – tensioning – or guiding – Convolute winding of material – With particular drive
Reexamination Certificate
1999-05-12
2001-11-06
Nguyen, John Q. (Department: 3653)
Winding, tensioning, or guiding
Convolute winding of material
With particular drive
C242S541400
Reexamination Certificate
active
06311922
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. §119 of German Patent Application No. 198 22 261.0 filed on May 18, 1998, and German Patent Application No. 198 52 257.6 filed on Nov. 12, 1998, the disclosures of which are expressly incorporated by reference herein in their entirety.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to a method and apparatus for winding a material web.
2. Discussion of Background Information
The present invention relates to an apparatus and method for winding a material web, such as, but not limited to, a paper or cardboard web, onto a reel, in which the material web is guided around a carrying drum, and in which a nip is formed between the carrying drum and the reel. The carrying drum and a winding roll that is being produced (e.g., the reel with the material web wound thereon) are kept in contact with each other during the winding process.
A winding machine and a process for winding a material web is disclosed, for example, in EP 0 483 092 A1. Such winding machines are used, for example, at the end of an operation for producing (or refining) a material web, such as, for example, a paper web. However, such machines can also be used, for example, to rewind a winding roll that has already been completely wound.
During a winding operation, irregularities can occur in cross direction profiles. In particular, irregularities can occur in the thickness profile of a material web. With regard to a paper machine, these irregularities usually occur only temporarily, because such irregularities can be eliminated by, for example, adjusting the head box. Nevertheless, such prior art devices have a disadvantageous influence on the winding formation. For example, a situation can arise in which a winding diameter is greater than a desired diameter at one point of the web width. When his occurs, there is no longer a cylindrical winding formation. An undesirable over-stretching of the material web may then occur, which can, for example, have an adverse effect on the flatness of, for example, graphic paper.
PCT patent document WO 95/30049 and German patent document DE 297 21 832, respectively, disclose a process for producing a fibrous material web, such as, for example, a paper or cardboard web, out of a fibrous suspension, in which the material web, after completely drying, is calendered online and subsequently wound onto a winding roll, However, defects in calender stack rolls, due to, for example, wear or the like, and/or variations in a moisture cross direction profile lead to local thickness variations in the calendering. If the varying thicknesses always occur at the same point in the winding of the web, web stretching and a poor travel of the material web in the reel cutting machine results.
SUMMARY OF THE INVENTION
Accordingly, an object of the current invention is to create a method and a winding machine for winding a material web that does not exhibit the problems discussed above. Specifically, the current invention discloses a winding machine (and a method for winding a material web) that reliably produces “perfect” windings, even in the presence of irregularities in the material web.
The object of the current invention is attained by cyclically inclining a reel and/or carrying drum of the winding machine in relation to a travel direction of a supplied material web. This arrangement results in a cyclical side traverse motion of the web in the winding roll that is produced.
The reel or carrying drum is alternatively shifted (or pivoted) in a first direction and then in a second direction. The carrying drum and the winding roll (that is being produced) on the reel are kept in contact with each other during the winding operation. That is, a nip of the winding machine is maintained as the material web is wound onto the winding roll. As a result of the cyclical inclination and the side traverse motion of the web, potentially occurring irregularities in the material web, such as, for example, an irregularly changing thickness cross direction profile, are distributed over a greater range over the web width, so that an impairment of the desired winding formation is prevented (or minimized). Despite possible irregularities, a virtually cylindrical winding diameter of the winding roll can be achieved.
Through the controlled cyclical inclination of the reel or carrying drum, the material web is displaced by a desired amount, and thus, cyclically traversed on the reel.
In a preferred embodiment of the invention, the reel is cyclically inclined and the movable drum is guided in a tracking motion in order to maintain the nip. In this connection, the movable carrying drum can also be used to adjust a line force in the nip. The line force is preferably kept constant at a predetermined value. The reel is suitably moved along at least one guide track, wherein it is simultaneously cyclically inclined in the process.
To ensure that the carrying drum always tracks the reel, and the line force in the nip is kept constant, the inclined position of the reel is not normally permitted to be greater than a stroke of the carrying drum.
In a practical embodiment of the invention, the reel, together with the winding roll being produced, is transported along a first guide track from a winding-start position to a transfer position, and along a second guide track from the transfer position to a finished winding position. After a new, still empty reel is brought into the winding-start position, the nip is formed (by virtue of the fact that the reel and the carrying drum are brought into contact with each other). After the material web is cut crosswise to its travel direction, the beginning of the new web is wound onto the new, still empty reel. This so-called “reel change” takes place, as a general rule, at a fill operating speed of the paper machine. After reaching a transfer position, the winding of the winding roll is finished (completed) while the reel, together with the winding being produced on it, is moved along the second guide track. When the finished winding position is reached, the winding roll is finished. From a removal position, the winding roll is removed from the relevant winding machine, using, for example, a crane or other type of winding roll removing device.
In one preferred practical embodiment, the reel is cyclically inclined and the carrying drum is guided in a corresponding tracking motion, both during the transportation of the reel from the winding-start position to the transfer position, and during its transportation from the transfer position to the finished winding position.
The increase in the winding roll diameter can be compensated for, at least, in part, by a corresponding movement of the reel (or the winding roll being produced).
It is beneficial if an increase in the winding roll diameter during the transportation of the reel from the winding-start position to the transfer position is compensated for, at least in part, by a corresponding movement of the carrying drum, and during the transportation of the winding roll (that is being produced) from the transfer position to the finished winding position, is compensated for at, least in part, by a corresponding movement of the reel or the winding roll being produced.
The nip can be kept in a predetermined position during a transportation of the winding roll (that is being produced) along the second guide track. In practice, a limited movement of the nip will not adversely affect the performance of the instant invention during the transportation of the winding roll (that is being produced) along the second guide track.
In a preferred embodiment of the invention, the reel is cyclically inclined and the carrying drum is guided in a corresponding tracking motion, both during the transportation of the reel from the winding-start position to the transfer position, and during its transportation from the transfer position to the finished winding position. If separate drive devices are provided for the transportation along the fit guide
Beisswanger Rudolf
Bock Karl Josef
Ihle Georg
Madrzak Zygmunt
Moller Roland
Greenblum & Bernstein P.L.C.
Nguyen John Q.
Voith Sulzer Papiertechnik Patent GmbH
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