Winding – tensioning – or guiding – Convolute winding of material – With particular drive
Patent
1996-01-24
1998-03-31
Darling, John P.
Winding, tensioning, or guiding
Convolute winding of material
With particular drive
2425304, B65H 1814
Patent
active
057329028
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns a method in winding of a web, in which method the web is wound onto a spool on support of a support roll while passed through a nip formed between the support roll and the roll that is being produced, in which method the spool is supported at least partly, in which method the spool/the roll is supported and/or loaded by means of a device whose position can be shifted.
Further, the invention concerns a device in winding of a web for carrying out the method in accordance with the invention, which device is fitted to be used when a web is wound onto a spool on support of a roll while passed through a nip formed between the roll and the roll that is being produced, which spool is supported at least partly by a support member placed in the centre of the spool, which device comprises a unit for supporting the spool and for loading the roll.
BACKGROUND OF THE INVENTION
When a web, such as a paper or board web, is wound in so-called centre-drive winders, it is typical that the rolls that are formed are supported partly from the roll face by circumferential support against the support roll and partly by means of centre support by means of seats fitted in the hole in the spool that constitutes the core of the roll. With respect to the prior art related to this, reference is made, for example, to the FI Patent No. 79,505.
In the prior art solutions, the force of contact of the roll that is being produced against the support roll must often be limited to about4 kN per meter of roll width to about 8 kN per meter of roll width, depending on the paper grade. For example, the weight of a roll of a diameter of 1.5 m may produce a force component of about 20 kN per meter in the direction of the support roll. In such a case, by means of the seats, about 16 kN per meter must be carried. Since, in connection with a large diameter, large roll widths also occur, for example more than 3 m, the support forces at the seats can be even up to 25 kN. In order to avoid spool damage arising from a high seat load, it is necessary to use high-quality special spools of sufficiently large diameters. This again increases the costs of the spools compared with the rolls produced by means of winders of a different type.
As a rule, the prior-art center-drive winder solutions are provided with a drive system acting upon the seats. By means of the torque of the seats, the paper that is wound onto the roll that is being produced is tightened. It is a drawback of this method that the effect of the torque is reduced when the diameter of the paper layer wound onto the circumference of the roll becomes larger. The circumferential force produced with an invariable torque is inversely proportional to the diameter of the roll and is, thus, reduced when the roll becomes larger. Since the strength of the spools limits the torque that can be transferred from the seats, the employment of this method provides just limited help in the control of the roll tightness when large rolls are produced. A further problem of the centre drive is the wide range of speeds of rotation that must be controlled by means of the drive gear.
Also, from the prior art, winders are known in which rider roll devices are employed in order that a sufficient pressure could be produced against the support roll in the initial stage of the winding and in order to prevent bending of the spool. During winding of certain paper grades, it has also proved advantageous to employ rider rolls to press the roll throughout the whole winding process.
With respect to the prior art, reference is also made to the international patent application PCT/EP93/00140 (WO 93/15988), wherein a device is described for winding a paper or board web, in which device, in view of improving the quality of the lateral rolls, an additional drive gear placed at each side of the winder is used for the lateral rolls, which additional drive gear consists of a roll or belt on which a rotating drive unit of its own is fitted, which unit applies pressure elastically, substantiall
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Koutonen Pauli
Leskinen Arto
Malmi Jarmo
Saukkonen Seppo
Sinkko Jari
Darling John P.
Valmet Corporation
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