Winding – tensioning – or guiding – Convolute winding of material – With particular drive
Patent
1998-11-18
2000-10-10
Jillions, John M.
Winding, tensioning, or guiding
Convolute winding of material
With particular drive
2425416, 2425417, 2425423, B65H 1810, B65H 1816, B65H 1826, B65H 1926
Patent
active
061293059
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a process for continuous winding of a material web, in particular a paper or cardboard web, and a winding machine for continuous winding of a material web, in particular a paper or cardboard web.
2. Discussion of Background Information
Winding machines and winding processes are known (see, e.g., (EP 0 561 128 A1). They are employed, for example, at the end of a machine for manufacturing a material web and are used for continuous winding of the material web onto a reel. The known winding machine includes a horizontally movable pressing drum, also called a Pope drum, over part of whose circumference the material web is guided. The material web is wound into a winding roll on reel. During the entire winding operation, the winding roll forms a winding gap with the pressing drum. In order to prepare for a change of the reel, an empty reel is pressed against the circumference of the pressing drum to form a new winding gap. During this winding phase, the material web is guided through both the nip between the new reel and the pressing drum and the closed nip between the almost-finished winding roll and the pressing drum. Then, in the region disposed between the full winding roll and the new reel, the material web is cut directly on the pressing drum and the new web beginning is wound onto the new reel. It has proven very difficult to transfer and wind the new web beginning onto the empty reel. In many instances, a number of attempts are necessary for this, which in turn leads to a relatively high percentage of waste.
SUMMARY OF THE INVENTION
The invention therefore creates a process for winding and an associated winding machine that do not exhibit these disadvantages.
A process is proposed that takes place in the following steps. The material web is guided by way of a movable pressing drum, which forms a winding nip with the winding roll, which is rotatably secured in a secondary transport device, wherein the line force in the winding nip is controlled/regulated during this winding phase shifting the pressing drum. In order to prepare for a reel change when a desired winding roll diameter is reached, the winding roll is moved away from the pressing drum by the secondary transport device so that the material web runs freely from the pressing drum to the winding roll. A new reel rotating at web speed is moved by a primary transport device into the free draw and is brought into a reel-changing position in which the new reel forms a new winding nip with the pressing drum. After this, the material web is cut crosswise over its width and with its new web beginning, is wound onto the new reel. During this winding phase, the control/regulation of the line force in the winding nip between the pressing drum and the new reel is in turn carried out by shifting the pressing drum. Finally, the new reel with the new winding roll is taken over by the secondary transport device, wherein the control/regulation of the line force occurs by shifting the pressing drum, even when the new reel is guided by the secondary transport device. Since the empty reel is partly wrapped by the material web before the transfer and winding-on of the new web beginning, i.e. the material web is guided over a circumference region of the new reel while the material web is still being wound onto the nearly finished winding roll, a reliable transfer of the web and start of winding of the winding roll onto the new reel can be assured. The process has a high degree of change-over reliability.
It is furthermore advantageous that the line force in the winding nip during the entire winding process is adjusted exclusively by relative movement of the pressing drum in relation to the winding roll. The pressing drum can be rapidly shifted due its relatively light weight in comparison to the weight of the growing winding roll. Consequently, jumps and fluctuations in the line force can be compensated for very rapidly. As a result of this, an exact, uniform line force in the wi
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Beisswanger Rudolf
Kaipf Walter
Madrzak Zygmunt
Moller Roland
Preising Ralf
Jillions John M.
Voith Sulzer Papiertechnik Patent GmbH
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