FI118683B - Method and arrangement of a wheelchair for a paper web - Google Patents

Description

118683

The invention relates to a method according to the preamble of claim 1 in a paper web reel.

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The invention also relates to a device according to the preamble of claim 8 in a paper web reel.

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Reference is made in the prior art to European Patent Publication No. 0369977, which discloses a method and apparatus in a paper web reel, wherein the roll is formed around a reel axis and / or on support rolls or straps, and which uses a reeling cylinder to form a reeling nip. The deflection of the cylindrical sleeve rotating about the center axis of the roller cylinder is controlled by a loading device, for example a hydraulic device, and by means of the deflection, the linear pressure distribution of the roller nip is controlled, e.g.

Reference is also made to EP-A-0912435, which discloses a method and a reel for continuously rolling a web of material. The roller • ea aa. *, * Comprises a movable winding cylinder to form a winding nip, and wherein • aa • aa ”Y the linear load of the winding nip is adjusted by a movable winding aaaa. In the arrangement shown in the reference, the winding cylinder For example, a deflection compensated roller is used as the reeling cylinder.

aaa or aa aa I a Y In prior art applications, the use of a roller reel roller 'aaa' ·! · * as a deflection compensated roller roller has sought to achieve a smooth * ··· * 30 nip / desired nip force profile with the reel load problems. In addition, efforts have been made to solve problems in the transverse direction of the paper with the aa a a aee 118683 2 and with the problems of air forming with the paper web in forming the roll. However, the prior art solutions described above have not completely eliminated the winding problems described above. In addition, as is known in the art, problems with the nip force may occur due to changes in the friction of the roller 5, for example, which cannot be detected, for example, in pressure measurements of hydraulic cylinders or force sensors.

Also known in the art are rollers in which bombardment is turned on the outer surface of the winding cylinder shell. The problem with these applications, however, is that the bombardment will function as desired only at a certain roll diameter and nip load level. In general, prior art bombardments achieve the ideal bottom of a forming roll, but larger roller diameters do not provide sufficient prior art bombardment. As the diameter of the resulting roll increases, the bombardment must be such that air entrained in the paper web is not active. Bombardment allows prior art solutions to compensate for a nip deflection by a given amount. . with constant nip load. An attempt has been made to determine the correct value of the bombardment • · · • · *. * '20 by utilizing many different types of parameters, but with sufficient accuracy *. . • · · * · ·. *. * le into the line loading area as the roll diameter changes.

It is an object of the present invention to provide a winding cylinder so that the disadvantages and problems of the prior art solutions described above t * 25 are eliminated. . witch or at least minimized.

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It is also an object of the invention to develop a reeling cylinder so that its applications are more sophisticated than those known in the art and more reliable.

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It is also an object of the invention to provide a deflection-adjustable winding cylinder which eliminates or at least minimizes the problems of prior art solutions associated with bombing a winding cylinder.

In order to achieve the foregoing objects which have been set forth above, the process according to the invention is essentially characterized by what is stated in the characterizing part of claim 1.

The device according to the invention, in turn, is essentially characterized by what is stated in the characterizing part of claim 8.

In the method and apparatus of the invention, the deflection of the roller sheath rotating about the center axis of the winding cylinder is controlled by the load exerted by the at least one loading means on the winding nip to provide a nip force with one loading device. According to a preferred embodiment of the invention, in the winding nip,. the effective nip force / nip force profile is also measured with said same roller internal loading means within the roll casing. Measurement • ··. Measuring *. * gauges placed under the bearing housings of the winding cylinder or a pressure sensitive measuring film on the surface of the roller may also be used for this purpose. According to the invention.

Thus, the J * V adjusts the nip load level by means of a deflection-adjustable winding cylinder, and according to a preferred embodiment, the same / same internal loading of the roll casing of the roll 25 cylinder is achieved. using tools.

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In accordance with a preferred embodiment, the deflection roller used in the method and apparatus of the invention is constructed such that the roller sheath of the roller roller 30 is movable to provide os-: /!! Shredding of the self relative to the roll to be performed. by sliding the roller shuttle back and forth ml-e * • · • m ··· 118683 by means of imbedded loading means, such as load and counter shoes, inside the roller sheath relative to the fixed central axis of the roller. allows for slight movement between the tending side and the drive side S web can be deflected, thereby achieving the advantage mm. reeling cylinder and the bearing can be fixed, as the oscillating movement is achieved by the shell and that the oscillation can be implemented in the sam adjusting the nip force and / or nip force profile acting on the lower device (s) as in the winding nip.

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The casing of the winding cylinder used in connection with the method and apparatus of the invention is preferably made of a composite material, for example fiberglass or carbon fiber, which gives an advantage in manufacturing costs because the manufacturing process is simple and fast and raw materials are inexpensive. In addition, the roll-15 diluent is more sensitive to operation than prior art rollers because the composite-free deflection-adjustable roller is lighter, thus subject to lower friction and more sensitive especially at low forces e.g. When used as a sheath material for a deflection-adjustable roll, the composite material, at low loading pressures, provides sufficient sheath movement to provide the necessary nip force for the winding nip.

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According to one embodiment of the invention, the deflection-adjustable winding cylinder is implemented such that the winding cylinder has a single zone over the entire area of the shell. In this way, the adjustment of the bulge (bombardment) can be achieved by making, e.g.

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25 by turning the inside of the sheath in the cross-machine direction during manufacture. .a desired thickness profile. In this embodiment of the invention, it is preferable to use a thinner or composite sheath than conventional sheath or bombardment at low pressure.

• · · * "· * Such a cylinder is well suited for use with rollers for roller roller applications * · * ··· * 30 as nip rolls for paper and coating machines, such as press,: * ·· calender, for coating stations, etc. 118683 5 cylinders are inexpensive to manufacture because no special loading shoes are required for deflection adjustment, but different sheath thicknesses provide the desired profile shape as a function of pressure. 5, preferably using a thin or composite material which, at low pressure, for example less than 10 bar, provides sufficient bulging (bumping) to provide a simple adjustable r extension roll / nip roll for deflection and nip straightness control. Such an application can be used particularly well in the case of rebuilding, whereby the standard deflection-adjustable cylinder in the object to be modernized is replaced by a cylinder according to the invention, whereby a sheath of a thickness thicker than the periphery is bombarded.

In one embodiment of the method of the invention, when using a deflection-adjustable winding cylinder according to the invention, the nip force profile of the roller is optimized at each step of the roller operation, for example by using a direct nip force profile during winding and a straight or medium weight nip force

• S · 20 • a • aa. In the following, the invention will be described in more detail with reference to the figures in the accompanying drawing, which are not intended to be limited in any way by the invention.

Fig. 1 schematically illustrates an embodiment of the invention in which the winding cylinder: the shell is oscillated.

Fig. 2A schematically illustrates an embodiment of the invention which provides a bombardment of a roller cylinder.

: 30 a · 'a • a * a aa a a a a a a a a a aaa 118683 6

Figure 2B schematically shows the deformation of the sheath in the longitudinal direction of the sheath, depending on the thickness of the sheath, at some starting values.

Fig. 3 schematically shows an embodiment of a deflection compensated winding cylinder 5.

In the embodiment shown in Figure 1, there is shown a schematic drawing of a winding cylinder 10 and a forming web roll 11 e.g. However, in the figure, the situation is with the winding nip shown in the scroll nip N for clearer picture. According to the figure, the sleeve 12 of the roll cylinder 10 slidably mounted on the inner load and counter shoes of the sleeve 12 is oscillated by moving the sleeve 12 relative to its fixed central axis (soul) by adjusting the position of the loading and counter shoes as desired. (not shown) while stationary. The winding cylinder 10 oscillates with the motions-13 with e.g. L ± 20 mm back and forth, whereby the machine roll 11 rotates accordingly, since the winding nip N between the winding cylinder 10 and the forming machine roll 11 is closed and force-controlled. In this situation, the web passing through the winding nip oscillates with respect to the machine reel, whereby, with a very small oscillation movement, the winding pulley is also rolled. . a deflection of the direction of travel of the web in the cylinder shell is achieved

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/./ 20 in the desired transverse direction to the machine reel.

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Referring to Figure 2A, the winding cylinder 10 is formed into a single zone such that its internal space 13 can be pressurized as indicated by the arrow P. To provide a desired bombardment B, the roll shell 12 of the winding cylinder 10 is manufactured. is formed from its thickness profile such that the bulging (a) of the jacket 12 (nucleus (bombardment) B under pressure) is desired. The thickness of the wall of the jacket 12 may be varied, e.g., such that the jacket 12 is thicker at the periphery; narrower in the middle region to produce bulge B in the center region as shown in the figure. The shape of the bulge is determined by the shape of the diaper 12 ♦ · * ·; · * 30 during manufacture and adjustable according to the pressure level of the interior space 13.

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As shown in Figure 2B, the shell 12 is deformed with the thickness of the shell 12 shaped as shown in Figure 2A according to curve 21. For comparison purposes, the diagram also illustrates the situation with a flat jacket, indicated by curve 22. In the example of the figure, the longitudinal direction of the jacket on the X-axis is from the edge of the jacket to the center of the jacket; The exemplary curves 21, 22 of the figure are illustrated in a situation where an internal pressure of 10 bar is used.

Referring to Fig. 3, the winding cylinder used in connection with the invention is a flexible-10 adjustable winding cylinder 10 comprising a central stationary axis 14 which may be pivotable about its central axis. A roller shell 12 is rotated about the central shaft 14 so that a space 15 is left between the central shaft 14 and the shell 12. The sockets of loading pistons 19 are disposed in the boreholes of the central shaft 14 to load the sliding shoes 17 forming the sliding surface 16 with the inner surface. The sliding surfaces are lubricated with the same pressure oil as is used to load the piston 18. The loading pistons 19 are connected to an oil system 40. According to a preferred embodiment of the invention, the roll shell 12 is of composite material, e.g., 20 to 50 mm thick, wherein the weight of the roll shell is light because of the density of the composite materials (e.g., carbon fiber / m2) is small compared to steel density (about 7800 kg / m3).

I aa *. . The invention has been described above with reference only to some of its preferred embodiments, aaa • aa. *. * However, the details of the invention are not intended to be narrowly

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j * V limits.

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• a * * a ·· • a a a 25 aa a a a • a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a

Claims (11)

A method of a wheelchair for a paper web, in which wheelchairs a web roller (11) is formed around a rolling shaft and / or on support rolls or straps, and in which method a rolling cylinder (10) is used which forms a rolling nip (N) with the groove (11) being formed, the rolling cylinder (10) being a bend adjustable rolling cylinder, wherein the bending of a roller sheath (12) rotating about a center axis of the rolling cylinder (10) is controlled within men (12) with a load exerted by A load means (P; 19) for providing and controlling a nip power and / or nip power profile acting in the rolling nip (N), characterized in that the roller sheath (12) of the rolling cylinder (10) in the method is displaced by said at least one load means. within the male (12) in such a manner that oscillation of the web in relation to the roll (11) is accomplished in such a manner that, upon displacement of the roller sheath (12), the web which the scroll moves in the rolling nip in the transverse direction relative to the roll (11). Method according to Claim 1, characterized in that the nip force • · V. · and / or the nip power profile in the method is measured with said at least one load member within men (12). • · • ♦ · • ♦ · • · ♦ · ϊ Method according to Claim 1 or 2, characterized in that the bomb (B) of the roller sheath (12) of the rolling cylinder (10) in the method • e * • · * ··· This is achieved by pressurizing the roller sheath (12) internally and according to the single shaft sheath (12) made in the manufacturing stage a thickness profile. The method according to any one of claims 1-3, characterized in that the * * the bending-compensated rolling cylinder (10) in the method is controlled * * so that it is optimal for nip power profile according to the operating stage in the wheelchair * ϊ ": 30 units. »· · • * • · * φ · 118683 12 5. A method according to claim 4, characterized in that the nip power profile is regulated so that it is straight during the tip drawing of the web carried out in the arc of the roll. 5 6. A method according to claim 4, characterized in that the nip profile is re-regulated so that it is straight and / or centered during rolling. Method according to any one of claims 1-6, characterized in that the oscillation of the roller sheath (12) of the rolling cylinder in the method 10 is accomplished by means for loading the roller sheath by displacing the roller sheath (12) relative to the fixed center axis of the rolling cylinder. various ends of the rolling cylinder. Apparatus at a wheelchair for a paper web, in which wheelchairs a web roller (11) is formed around a rolling shaft and / or on support rolls or straps, and the device comprises a rolling cylinder (10) forming a rolling nip (N) with the roller (11) is formed, which rolling cylinder (10) is a bend-adjustable rolling cylinder, about whose center axis is arranged: We have a rotating roller sheath (12) and in connection with which there is provided at least one load means (P 19) for auxiliary and regulating of a nip force and / or nip power profile acting in the rolling nip by: ·: mediating the bending of the roller sheath (12), characterized by, • ·: said at least one in connection with the rolling cylinder (10) provided with load means within the roll sheath (12) are arranged for displacement of the roll sheath (12) in such a way that oscillation of the web is effected in such a manner. In such a way that when the roller sheath (12) is displaced, the web that is being rolled moves in the rolling nip (N) in the transverse direction relative to the roller (11) as the car * * ** das. • φ • φ • φ φ φ • m • · Φ · a 118683 13 9. A device according to claim 8, characterized in that the nip force and / or the nip force profile operating in the rolling nip (N) are arranged to be measured with said at least one load means. 10. Device according to claim 8 or 9, characterized in that the roller jack for regulating the pinch force in the rolling pin (N) is bombed in such a way that the roller jacket is arranged to be pressurized internally and on the roller jacket (12) a thickness profile according to a desired bombing. 10 Device according to any of claims 8-10, characterized in that the roller sheath (12) of the rolling cylinder (10) is made of a composite material. • · • · * • · · • · ·· • · • ·· • · ♦ ♦ • • ♦ • ♦ • · • a · * · ♦ ··· ♦ • ♦ • · · • · · · »· · • ··· · · ♦ ♦·· • · · ♦ ♦ ♦ ·· ♦ ··· • · ··· • · • t • · ··· • ♦ aaa * ·