Winding – tensioning – or guiding – Convolute winding of material – With particular drive
Reexamination Certificate
2002-07-29
2004-05-25
Matecki, Kathy (Department: 3654)
Winding, tensioning, or guiding
Convolute winding of material
With particular drive
C242S526300, C242S524000, C242S532200
Reexamination Certificate
active
06739545
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to processes and apparatus for winding a running material web including transferring the running material web from one winding core to another.
The invention relates to a process for winding a running material web, in particular a paper or cardboard web, in which the running material web is wound consecutively on several winding cores, in particular reel spools, and in which winding on a new winding core is started each time a wound reel formed on a previous old winding core has reached a predetermined diameter, with the new and pre-accelerated winding core being brought preferably directly to a winding roll, in particular a reel drum, over the partial outer circumferential area of which the running material web is guided before winding on the winding core, with the formation of a nip, and with at least one cut being made in the running material web in front of or on the winding roll by at least one cutting unit, with the formation of at least one transfer strip.
The invention further relates to a winding machine for winding a running material web, in particular a paper or cardboard web, in which the running material web is wound consecutively on several winding cores, in particular reel spools, and in which winding on a new winding core is started each time a wound reel formed on a previous old winding core has reached a predetermined diameter, whereby the new and pre-accelerated winding core can be brought preferably directly to a winding roll, in particular a reel drum, over the partial outer circumferential area of which the running material web is guided before winding on the winding core, with the formation of a nip, and whereby at least one cut can be made in the running material web in front of or on the winding roll by at least one cutting unit, with the formation of at least one transfer strip.
2. Discussion of Background Information
Winding processes and winding machines are used, e.g., in paper or cardboard manufacturing, in order to wind the finished and running paper or cardboard web consecutively on several winding cores, which are also called reel spools, without interrupting the manufacturing process, i.e., without switching off the paper or cardboard machine.
It is to be ensured that the new web leader formed by cutting through the running material web is guided to the new winding core in order to subsequently form a new winding reel on it.
A winding process and a corresponding winding machine for a running material web, in particular a paper or cardboard web, are disclosed in U.S. Pat. No. 4,444,362, and its family member EP 0 089 304 A1, the disclosures of which are incorporated by reference herein in their entireties, in which two crossing lines are cut in a running material web by two movable slitting means which run from the respective spaced starting points at opposite sides of the longitudinal center line of the running material web converging to a cut and from the cutting point diverging to opposite edges of the running material web. The tongue projection formed by this course of the two slitting means is directed onto a new rotating winding core by an air stream produced by a winding start device against the web travel direction of the running material web.
It is detrimental in this winding process that the air stream acting against the web travel direction of the running material web jolts the same, causing an uncontrollable tangle of cut and running material web, thus greatly reducing the process safety as well as the usability of the winding process. In the worst case, a complete break in the running material web can occur in the area of the winding machine, after which a time-consuming and expensive transfer of the forming running material web through a large part of the paper or cardboard machine is necessary.
Furthermore, a winding process for a running material web, in particular a paper or material web, is disclosed in U.S. Pat. No. 5,360,179, and its family member EP 0 543 788 A1, the disclosures of which are incorporated by reference herein in their entireties, in which again a transfer strip is cut out of the running material web by at least one cutting means, is blown onto a new winding core by a blowing device acting preferably from below, and is subsequently cut across the width of the web.
This disclosed winding process has the disadvantage that, although the transfer strip is blown onto the new winding core for better transfer, this blowing is too uncertain regarding its process safety and its effectiveness, particularly in view of the higher speeds of travel of the running material web nowadays, which are usually in the range of 1,200 m/min to 2,500 m/min.
Still more winding processes and winding machines for running material webs are known from various other publications, but all of them have greater or lesser disadvantages,
Thus, e.g., commonly assigned DE 198 48 810 A1 and DE 199 44 704 A1, and their family member U.S. patent application Ser. No. 09/421,874, filed Oct. 21, 1999, the disclosures of which are incorporated by reference herein in their entireties, disclose processes for cutting a running material web, in particular a paper or cardboard web, whereby in DE 198 48 810 A1 the running material web is separated between a nip formed by the winding roll and a new winding core, and the winding reel formed on the old winding core, and in DE 199 44 704 A1 it is cut in front of the winding roll. Both processes depend on a self-transfer of the new web leader onto the new winding core, whereby, however, the self-transfer can be very difficult and sustained; process safety, in particular at the above-mentioned web travel speeds of the running material web, is quite out of the question.
SUMMARY OF THE INVENTION
The present invention relates to a process and a winding machine which render possible an optimal winding first of the at least one new transfer strip, and then, after a period of time, of the running material web onto the new winding core with optimal runnability and favorable investment and process costs.
The present invention is attained according to a process wherein at least one cut is made preferably running parallel to the web edge of the running material web and in the web travel direction of the running material web, in that, after the beginning of at least one cut has run through the nip formed by the winding roll and the new winding core, the at least one formed transfer strip which is incorporated in the running material web is detached from the outer circumferential area of the winding roll and simultaneously cut through by at least one directed high-energy air jet that is generated briefly by at least one separator device. Subsequently, the at least one now detached transfer strip is transferred onto, and preferably applied to, the outer circumferential area of the new winding core by at least one first blower device, in particular a blower shoe. The high-energy air jet is thereby preferably directed perpendicular or approximately perpendicular to the travel direction of the material web or at an angle of more than 45°, preferably more than 60°, in particular more than 75° against the travel direction of the material web. This direction of the high-energy air jet ensures with high process safety that the transfer strip is safely detached and cut in the described manner. The process steps according to the invention ensure, with optimal runnability and favorable investment and process costs, that the at least one new transfer strip and subsequently the running material web following after a time lag are wound on the new winding core. Moreover, by using at least one cutting unit, at least one separator device with at least one directed high-energy air jet and at least one first blower device, at least one transfer strip is optimally produced and the transfer strip is subsequently threaded onto the new winding core before the running material web is subsequently threaded onto the new winding core across the width of the web. All thre
Drefs Wolfgang
Madrzak Zygmunt
Maurer Joerg
Wetschenbacher Ewald
Greenblum & Bernstein P.L.C.
Langdon Evan H
Matecki Kathy
Voith Paper Patent GmbH
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