FI121112B - Fiber web machine reel winding axis - Google Patents

Description

FIELD OF THE INVENTION The invention relates to a fiber web machine reel winding axis according to the preamble of claim 1.

It is known in the art to use reels for fiber web machines such as paper and board machines to weave a fiber web made from fiber web machines such as a paper-10 machine / board machine into a full-width web for machine processing. The web is wound around a winding shaft, for example, a reel iron / roll, either through a surface draw in a winding nip between the winding cylinder and the forming web roll, or utilizing a center drive, wherein the winding shaft is also provided with drive. In the case of fiber web machines, such as papermaking and board machines, unwinding rollers are also used in which a roll of reel rolled on a reel is unwound at a later stage of processing for further processing of the fiber web. After unwinding, the deflated winding shaft is returned for use with the rewinder.

As is known in the art, to start the winding of a new web roll, the end of the web is guided to the winding axis. During the initial roll, rolling of the webs forming the bottom of the roller around the winding axis may result in different bottom roll stresses within the roller resulting from the movement of the previously rolled webs during rolling in the longitudinal direction of the roller axis. One particular problem is the so-called worm phenomenon, which usually occurs at the periphery of the web reel near the bottom of the machine reel, i.e., in the initial web roll winding web layers around the reel axis and consists of almost machine-directional in transverse motion within the roll during the roll. The mat webs may further cause gloss at these points, whereby the web will no longer be subject to further processing and, in particular, the bottom roller edge rollers may need to be wrecked.

As is known in the art, attempts have been made to minimize the emergence of wormholes by using a medium weft and as low a nip load as possible. However, this type of winding is not possible if the roller has no center drive or if the roller is wide, with a high speed coater, which requires a higher nip load to maintain the machine roll.

One prior art solution for removing worm poles is to provide a smaller diameter portion of the flat coating layer near the ends of the roll shaft body by removing material from the coating of the roll shaft a certain distance from the ends of the roll shaft to provide a step This arrangement is problematic, however, if the replacement device is a so-called webbing changeover device, whereby the replacement tape in the nip must adhere to the surface of the winding shaft, i.e. the nip must also be adhered to the peripheral area.

Reference may be made, in the prior art, to European Patent Publication 1077192, which discloses a method for winding a paper or cardboard web, wherein the web is wound around a convex winding core, wherein the convexity is formed from a web to be wound at the beginning of the winding. However, this arrangement is problematic because it does not provide a means for permitting transverse movement of the web roll bottom layers 25

It is also known in the art to use rolls in which the longitudinal end areas of the roll are provided, for example, with grooves or made with other physical properties relative to the other longitudinal portion 30 of the roll, to be used for spreading fiber web machines or nip rolls. Such arrangements may be cited, for example, in U.S. Patent No. 6,820,834 and U.S. Patent No. 5,607,039.

The object of the invention is to eliminate or at least minimize the problems caused by the tension inside the machine roll.

A more specific object of the invention is to eliminate the problems associated with worm vanity.

In order to achieve the above and later objects, the winding shaft according to the invention is essentially characterized by what is stated in the characterizing part of claim 1.

According to the invention, the winding axis of the fiber web machine reel comprises means for forming at least one, preferably each longitudinal edge region, a transverse axis to allow transverse movement relative to the main web direction of the web web base layers, most preferably at least In accordance with the invention, a means for perpendicular to the main web direction of web movement of webs of webs is arranged so as to allow transverse movement of the webs bases preferably at least outwardly, i.e. at the peripheral edge of inward movement, i.e. toward the longitudinal center 25 of the web roll. In this way, the inner tension of the web reel is minimized and, in particular, the worm phenomenon can be minimized, whereby smaller diameter reel shafts can be used, thereby saving costs in manufacturing reel shafts and on the other hand. However, in the invention, the possibility of transverse movement of the web roll bottom layers with respect to the main direction of web travel is not necessarily visible at the end of the web roll 4, since the means allowing this movement in at least one peripheral area .

According to a preferred embodiment of the invention, the longitudinal end regions, i.e. the edge regions, or at least one of the peripheral regions, of the reel axis of the fiber web machine are coated with a material of different hardness, preferably softer than the center region of the winding axis. Preferably, this is accomplished by making the coating of the winding shaft on the edge regions of a softer material than the central region. The softer material of the peripheral regions is compressed on the winding shaft below the mass of the rolled web, thereby providing a means for permitting transverse movement of the web web base layers, i.e. a shape allowing for transverse movement of the web bottom layers. However, during the changeover phase, the compression has not yet occurred, so that the changeover nip is also attached to the peripheral areas and the tape changeover operates. Preferably, the edge regions have a softness greater than 50P & J and the middle range less than 20P & J.

According to another preferred embodiment of the invention, the longitudinal end regions, i.e. the edge regions or at least one of the peripheral regions, of the winding axis of the reel of the fiber web machine 20 are provided with a groove or perforation such as blind drilling. to allow transverse movement of the bottom layers in a direction perpendicular to the main direction of web travel, i.e., a shape allowing transverse movement of the bottom layers of the rolls, preferably a stepped shape, is provided on the surface of the winding shaft. On the other hand, however, compression has not yet occurred during the replacement phase, so that the nip also closes at the peripheral areas. In this embodiment, a soft coating material is preferably used to facilitate compression.

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According to a third preferred embodiment of the invention, a means is provided on the surface of the winding shaft for permitting transverse movement of the web web base layers in the alternating step, e.g. Then, at the desired stage, the cutting is accelerated / retarded to obtain the desired shape, preferably step-like.

According to a fourth preferred embodiment of the invention, the means for permitting transverse movement of the web web base layers in a transverse direction relative to the main web direction of travel is implemented such that the coefficient of possible. Preferably, the difference between the edge friction coefficient and the center region friction coefficient is greater than 0.10.

According to a fifth preferred embodiment of the invention, the means for permitting transverse movement of the web web base layers in a transverse direction relative to the main web direction of the web is provided by stepwise shaping and substantially constant coating of the winding shaft on at least one peripheral region;

In the following, the invention will be described in more detail with reference to the figures in the accompanying drawings, in which details, however, are not intended to be narrowly limited.

Fig. 1 schematically illustrates a roll-up axis of a roll-30 dilution according to an embodiment of the invention.

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Figures 2A-2C schematically show partial views of reel winding shafts according to other embodiments of the invention.

Fig. 3 is a diagram illustrating a web cut in a water cutting exchange for implementing an embodiment of the invention.

Fig. 4 is a diagram showing a substantially stepped shape.

In the figures and in the description relating thereto, the same reference numerals 10 are used for like parts unless otherwise indicated.

According to Figure 1, the winding axis 10 of the fiber web machine roller is coated according to the invention, the coating material of the peripheral regions 11 is softer than the coating of the central region 12. Hereby, as the web is wound around the winding axis 10, the peripheral regions 11 are compressed more than the central region 11, thereby providing a means for permitting transverse movement Z, i.e. a stepwise shape 13, permitting transverse web moving Z of the web. The edge regions 12 preferably extend to the region where the worm effect occurs, typically about one meter in length from the winding axis 10. The stepped shape formed during compression is preferably 1 mm smaller than the radius of the winding shaft 10.

In the embodiment of Fig. 2A, the peripheral area 11 of the winding shaft 10 is provided with a groove 25 15, whereby the grooved area is compressed more than the central area 12 by the mass of webs rotating on the winding shaft, thereby allowing transverse Z a change in radius of greater than 0.5 mm, preferably 1 mm.

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In the embodiment of Fig. 2B, the peripheral area 11 of the winding shaft 10 is blinded by bores 16, whereby the peripheral area is compressed more than the central area 12 by the mass of webs rotating on the winding shaft during winding. preferably a change in radius greater than 0.5 mm, preferably 1 mm, is obtained.

In the embodiment of Fig. 2C, the peripheral region 11 of the winding shaft 10 has a lower friction coefficient than the central region 12.

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Figure 3 is a schematic diagram showing the shape of the end of a web 20 formed by a water cutting change, which occurs when the cutting is accelerated / retarded such that the web 20 itself forms a shape on the winding axis that permits transverse movement of the bottom layers of the roll. The deceleration / acceleration point 15 is designated 21 in the figure.

Figure 4 is a schematic diagram illustrating a preferred stepped shape 13 which provides, in accordance with the invention, a shape that permits transverse movement of the web roll bottom layers during winding.

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The invention has been described above with reference only to some advantageous embodiments thereof, the details of which, however, are not to be construed in any way as being narrowly limited.

Claims (5)

A roller shaft for a wheelchair in a fiber web machine, said roller shaft comprising a means (13) formed at at least one longitudinal edge region (11) of the roller shaft (10) for permitting a transverse (Z) movement of the bottom layers of the web roller in relative to the main running direction of the male, characterized in that the means (13) on the roller shaft (10) for permitting a transverse movement (Z) of the bottom layers of the web roller relative to the main running direction of the web is formed at the stage of changing web roller in the reel chair by cutting the fiber web (20) which is guided to the roller shaft (10) in such a way that the bottom layer of the web roller forms the means (13) by braking / accelerating the cutting. Roller shaft according to claim 1, characterized in that the roller shaft (10) comprises a means (13) formed at the two longitudinal edge regions (11) of the roller shaft (10) for permitting a transverse (Z) movement of the bottom layers of the web roller in relative to the main running direction of the web at least towards the edge (s) of the web reel during the reel. 20 Roller shaft according to Claim 1 or 2, characterized in that the longitudinal edge region / longitudinal edge region (11) of the roller shaft (10) is coated with a softer material than the center region (12) of the roller shaft for forming a means (13) on the roller shaft (10). for permitting a transverse movement (Z) of the bottom layers of the web roller relative to the main running direction of the web. Roller shaft according to claim 1, characterized in that the means (13) for permitting a transverse movement (Z) of the bottom layers of the web roller in relation to the main running direction of the web is a web-shaped staircase (13). Roller shaft according to any of the preceding claims, characterized in that the friction coefficient of the coating on the longitudinal edge / longitudinal edge regions (11) of the roller shaft (10) is less than the fiction coefficient of the center region (12). means (13) on the roller shaft (10) for permitting a transverse movement (Z) of the bottom layers of the web roller relative to the main running direction of the web. 10