Paper making and fiber liberation – Apparatus – With product winding or reeling means
Reexamination Certificate
2001-07-25
2003-09-09
Griffin, Steven P. (Department: 1731)
Paper making and fiber liberation
Apparatus
With product winding or reeling means
C162S194000, C162S193000, C242S525100, C242S530400, C242S531000, C242S533200, C242S542000, C242S542300
Reexamination Certificate
active
06616809
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. §119 of German Patent Application No. 100 39 040.4, filed on Aug. 10, 2000, the disclosure of which is expressly incorporated by reference herein in its entirety.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a process for producing paper reels from a paper web in which the paper web is calendered and cut lengthwise into partial webs and the partial webs are wound into paper reels. The invention further relates to a device for producing paper reels having a paper machine, a calender, a longitudinal cutting device, and a reel winding device.
2. Discussion of Background Information
The production of paper is known per se. In the paper machine, pulp is poured onto a circulating wire through which the water can drain. At the end of the wire, the paper web being formed is transferred to a drying section that allows a base paper to be removed at the exit of the paper machine. In most cases, this base paper is wound into a jumbo reel. On the jumbo reel, the paper web is then transported to a calender and calendered. At the end of the calender, the calendered paper is wound and guided to a reel cutting and winding device. In the reel cutting and winding device, the paper web, which is generally present in a width of up to 10 m, is cut into manageable widths in the range of 0.5 to 3.8 m and wound into paper reels having a diameter in the range of 0.5 to 2.5 m. Later on, only paper reels of this type are manageable for a consumer, for example, a printer.
This process is relatively time-consuming, but has the advantage that all process steps can occur at a speed that is adapted to the respective process. However, the material web is strained by the several transitional or intermediate windings in this process.
SUMMARY OF THE INVENTION
Accordingly, the present invention simplifies the production of paper reels.
In particular, the invention provides a process of the type mentioned at the outset which also includes that the calendering, longitudinal cutting, and winding occur on-line without intermediate winding.
In other words, the paper web exiting the paper machine is immediately guided to a calender in order to calender it. From the exit of the calender, the paper web is guided to the longitudinal cutting and winding device, without intermediate winding, so that the paper reels are produced at the same speed at which the paper machine dispenses the paper web. In this way, the paper web is protected because only one single winding sequence is necessary. Moreover, because it is not necessary that the paper web be intermediately wound onto jumbo reels, considerable set-up times that are necessary for preparing the reel spools and for moving the reel spools and the jumbo reels are omitted. Finally, a large savings in apparatus, e.g., crane arrangements needed for moving the reel spools and jumbo reels, is attained.
In an exemplary embodiment, a narrow strip of the paper web can be guided into the winding device at the beginning of production and from there into a disposal device. This strip can then be extended to the width of the paper web, longitudinally cut, and the longitudinally cut partial webs may then be transferred onto winding cores. Basically, the beginning of production is to be understood as all situations in which the paper web must be “threaded” again. This occurs not only at the start-up of the paper machine, but also, e.g., after a paper web tear.
It has been observed that the insertion of the paper web in its full width into the calender, the longitudinal cutting device, and the winding device is almost impossible. Therefore, a narrow strip is initially used, which is guided from the calender to the winding device using known devices, e.g., cable guides or suction belts. However, this narrow strip is not yet wound, but is instead guided into a disposal device, e.g., a pulper. When this narrow strip has stabilized itself, it is widened until it has attained the width of the paper web, but, at least initially, even the wide paper web is still disposed of at the exit of the winding device, since the longitudinal cutting device does not become activated or begin producing partial webs until the paper web arrives in the winding device with its full width. Thus, the beginning of the partial webs can be disposed of as well. Further, only when the partial webs have stabilized are they transferred to the winding cores.
It may be advantageous for the partial webs to be cut in a crosswise manner immediately before being transferred to the winding cores. Thus, essentially same web lengths are wound onto all winding cores, and the winding sequence can begin at the same time for all paper reels.
It may be advantageous for the winding cores to be pre-accelerated to the web speed before the transfer. In this way, when the partial webs cut from the paper web come into contact with the winding core, they can be attached thereto without any large problems because there is no longer any relative speed between the partial webs and the winding cores.
Preferably, the paper reels are wound in a winding bed with one first and one second king roll, with the paper web approaching in contact with the first king roll and with the winding cores in contact during acceleration with the second king roll, which is driven, and kept at a distance from the first king roll. Thus, it becomes possible to bring the winding cores to a same circumferential speed as the first king roll by controlling the speed of the second king roll. The first king roll is also driven, with its drive being independent that of the second king roll. Thus, the two king rolls are used for different purposes. The first king roll accepts the approaching paper web and supplies it in a disposal direction, with the paper web optionally being held firmly against the first king roll with the aid of a clamping roll. The second king roll is used to accelerate the winding cores. When the partial webs have been transferred to the winding cores, the two king rolls assume their usual task again and support the paper reels being formed.
Paper reels that are wound consecutively one after the other are wound in two winding beds in an alternating fashion, with the partial webs being separated by paper reels after one batch is completed and being guided into the other winding bed, which has already been supplied with winding cores that have been pre-accelerated. Thus, it is possible to allow a continual winding of a continuous paper web onto different paper reels. The paper web can be supplied in an interruption-free manner and is constantly being wound onto the paper reels in one of the two winding beds.
It may further be advantageous for both winding beds to have one king roll in common, with the completed paper reel being lifted by this king roll and allowed to exit on the other king roll of the winding bed while the paper reels are being wound in the other winding bed. This process achieves several advantages, e.g., the progression of the paper web is essentially kept constant independently of the winding bed in which the paper reels are being wound, and the speed control of the first king roll can achieve the fact that this king roll always runs with the same circumferential speed at which the paper web approaches. Because the complete paper reels are lifted from this first king roll and are allowed to exit on the second king roll, it is also possible to use the first king roll for winding the next batch of paper reels without this being impeded by completed reels. Therefore, the spatial arrangement of the two winding beds in close proximity to one another does not constitute a reason for interrupting the winding process such that the paper web can continue to be processed at the same speed at which it exits the paper machine.
Moreover, the invention is attained in a device of the type mentioned at the outset in which the paper machine, the calender, the longitudinal cutting device, and the reel winding device are arrang
Conrad Hans-Rolf
Cramer Dirk
Griffin Steven P.
Hug Eric
Voith Paper Patent GmbH
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