Winding – tensioning – or guiding – Convolute winding of material – With particular drive
Reexamination Certificate
2000-08-15
2003-03-25
Nguyen, John Q. (Department: 3654)
Winding, tensioning, or guiding
Convolute winding of material
With particular drive
C242S541500
Reexamination Certificate
active
06536705
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a process for winding a material web produced from a pulp suspension and finally dried, e.g., a paper or cardboard web, onto a reel spool to produce a wound reel, in which the material web is smoothed “online” and is then conducted over a reel drum. A winding nip is formed between the reel drum and the reel spool, and the reel drum and the wound reel being formed are held in contact with one another during the winding procedure.
The invention further relates to a winding machine for winding a material web produced from a pulp suspension and finally dried, e.g., a paper or cardboard web, onto a reel spool to produce a wound reel, in which the material web is smoothed “online” and is then conducted over a reel drum. A winding nip is formed between the reel drum and the reel spool, and the reel drum and the wound reel being formed are held in contact with one another during the winding procedure.
2. Discussion of Background Information
Such a process and such a winding machine are known, e.g., from the published European Application No. EP 0 483 092 A1. They are used, e.g., at the end of a machine for producing or finishing a material web. However, they can also be used to rewind an already fully wound reel. The machine in question can be, e.g., a paper or cardboard machine.
From the commonly owned International Publication No. WO 95/30049, of which U.S. Pat. No. 5,685,909 was a U.S. National Stage application, a process and a winding machine are also known for producing paper webs coated bilaterally inside a paper machine in which the coated paper web is smoothed by at least one online calender and is then wound onto a reel spool to produce a wound reel.
Furthermore, in the commonly owned German Utility Model Patent No. DE 297 21 832.8, a device is disclosed for optionally smoothing coated or uncoated material webs, such as, paper or cardboard, that are at least partially dried in the drying section of a paper machine. The disclosed device includes at least one web guide roll, at least one calender, and a reeling device.
Experiments that have been performed have now revealed that, after the online smoothing, irregularities can occur in cross profiles, such as, in particular, in the thickness cross profile of a material web, where the average thickness of the material web is also reduced to about 70 to 30% of its original thickness. These irregularities generally occur only occasionally, in particular in the case of a paper machine, because irregularities can be eliminated, e.g., by adjusting the headbox. Nevertheless, they can have a detrimental effect on the symmetry of the winding construction. Therefore, the result may be that the winding diameter on one side of the material web width is, e.g., larger than the desired diameter. The winding construction is then no longer cylindrical. Moreover, it also results frequently in an undesired overstretching of the material web, which can, e.g., have a considerable effect on the flatness of graphic papers.
SUMMARY OF THE INVENTION
The present invention provides a process as well as a winding machine of the type generally described above, with which, notwithstanding any irregularities in the material web, a substantially always perfect winding construction is ensured in the most simple and reliable manner possible.
In view of the process, the invention provides that the reel spool and/or the reel drum are moved (traversed), preferably axially (or cross-wise), with respect to the web travel direction of the fed material web. In a further embodiment of the invention, the movement can be achieved by a cyclical tilting of the reel spool and/or the reel drum. The concept of traversing movement is a well-known concept to those skilled in the art of printing press construction. The traversing ability designates the possibility of displacing a component axially along its longitudinal axis. For example, printing rollers are accommodated bilaterally on a machine frame in roller bearings so that they can be moved, i.e., can be displaced axially. Such a printing roller is disclosed in, e.g., German Utility Model No. DE 296 11 112. Moreover, the concept of traversing is sufficiently well-known in textile machinery construction. A known traversing is that part of a textile machine, preferably textile machines for the production of synthetic threads, that by a to-and-fro movement of the winding-on thread, ensures that a regular thread winding is formed. Most recently, the concept of traversing has also been used in paper and cardboard machine construction in accordance with the above explanations.
Thus, the reel spool or the reel drum can be alternately displaced or tilted in the one and then in the other direction. However, the reel drum and the wound reel being formed on the reel spool are held in contact with one another during the winding procedure, i.e., the winding nip is maintained. As a result of the movement, any irregularities that occur in the material web, e.g., an irregularly changing thickness cross profile, may be distributed over the web width over quite a large area, so that an impairment of the desired winding construction is virtually excluded and an at least approximately cylindrical winding diameter can be achieved in spite of any irregularities. By the controlled movement of the reel spool or the reel drum, the material web can be deflected in the web travel direction of the material web by the desired amount and is thus moved on the reel spool.
In a preferred practical embodiment of the process according to the invention, the reel spool is moved, preferably axially, and the movable reel drum is tracked to maintain the winding nip. In particular, the line load in the winding nip can also be adjusted via the movable reel drum, and this line load preferably can be held constant at a value that can be specified in advance. The reel spool is advisably moved along at least one guideway, with it optionally being simultaneously tilted in a cyclical manner while being moved.
So that the reel drum can always follow the reel spool even at the optionally simultaneous cyclical tilted position and, so that the line load in the winding nip can also be kept constant, the tilted position of the reel spool should ordinarily be no greater than the lift of the reel drum.
While in the preferred embodiment the reel spool is moved, e.g., axially, and the movable reel drum is tracked to maintain the winding nip, in principle an embodiment of the process according to the invention is also conceivable in which the reel drum is moved, e.g., axially, and the movable reel spool is tracked to maintain the winding nip.
If the material web is conducted over a web guide roll in the web travel direction of the material web before the reel drum, this web guide roll is also preferably moved, e.g., axially. In this connection, the movement of this web guide roll advisably takes place so that at least essentially equal longitudinal tensions result in both edge regions of the fed material web.
It is advisable for the web guide roll to be moved in a vertical plane.
In a preferred embodiment, the reel spool and/or the reel drum may be moved, e.g., axially (cross-wise), with respect to the web travel direction of the fed material web only when certain roughness values of the material web are present. This results in the advantage from the point of view of operational efficiency that, with material webs having very small differences with respect to their roughness values, e.g., material webs of LWC or LC grades of paper, no traversing of the material web takes place. Preferably, the roughness values include the value range of about 0.05 to 1.25 PPT, preferably about 0.5 to 1.15 PPT, with the roughness values furthermore being measured by at least one roughness sensor. PPT (Parker Print Surf) is the unit of roughness determination by the print surf method, which is standardized in DIN ISO 8791 Part 4, the disclosure of which is expressly incorporated by reference herein in its entirety. This
Greenblum & Bernstein P.L.C.
Nguyen John Q.
Voith Sulzer Papiertechnik Patent GmbH
LandOfFree
Process and winding machine for winding a material web does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process and winding machine for winding a material web, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process and winding machine for winding a material web will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3079907