FI107327B - Wheelchair of a paper web and its cylinder - Google Patents

Description

1 107327

Paper web reel and cylinder

The present invention relates to a reel of a paper machine or paper finishing device which prevents an air bag or layer underneath the top layers of a paper web roll prior to the nip between the reeling cylinder and the roll, and any pouch caused by the bag to roll. The invention also relates to a roll of a roll of paper web.

10 The finished paper web of a paper machine or other device handling a web-like product is rolled at the end of the machine in a reel around a roll called a reel roll. A roll of paper formed from a wide sheet of paper coming from the machine is called a machine roll. The winding device is formed by a winding cylinder which rotates at a peripheral speed corresponding to the speed of the paper web and is supported by shafts at its ends on the winding body, at one end paper web 20 speed. The type of reel is also referred to as a pope reel. The finished web is collected on the spool reel in the rewind position while the roll is loaded towards the rewind roll. The reel roll may be driven by friction through a paper web from a winding roller (so-called circumferential-second pop roller), or it is nowadays provided by a common solution, which is referred to as hub-driven rollers. When a sufficient amount of paper web has accumulated in the *: reel spool, the roll is removed from the surface of the reeling cylinder. The roller circumferential velocity decreases when the roller is braked at •• V, and before the reel spool a bag is formed which, by means of airflow · /: *: is guided around the new empty reel spool introduced to the reel drum. The paper web going to the full reel reel ruptures immediately and begins to rewind to the new reel reel. Other switching methods are also available and depend on, for example. basis weight of paper.

•. Also known is a reel used for winding machine rolls in which a tambour drum rotates and the winding cylinder is loaded against the roll. and moving according to roll growth.

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Additional rollers that are in contact with the reel can also be used in the previous reel. In addition, there are other types of rollers in which the rotating roller or cylinder is at a certain pressure in contact with the roll formed from the paper web, such as printing rollers and carrier rollers. j 5!

For certain thin or slippery printing grades (e.g., LWC and] SC grades), the paper web may slip on the surface of the winding cylinder. This occurs when a growing roll of paper obtains rotational power directly from the winding cylinder by means of friction. j 10 Then the question is that between the paper web and the winding cylinder | the friction is insufficient and slippage is created which causes the peripheral speed of the reel to be j less than the peripheral speed of the reeling cylinder and the speed of the web to be wound onto the reel. Because of the speed difference between the reel cylinder and the oak drill roll, the paper web tension decreases and uncontrollable changes in tension and hardness begin to occur, which causes loosening of the roll, rattling, and may also cause swelling of the roll after finishing. j 5 3

There have been many attempts to increase the friction between the paper web and the winding cylinder. First, the sliding of the paper web is dependent on the tension of the paper web by which it presses in its contact area against the surface of the reel and cylinder. Another factor is the line pressure by which the reel roll is pressed or, by gravity, pressed against the reel cylinder. In addition, the surface quality of the paper and rolls affects their intermediate friction coefficient. By arranging your own reel in a reel, you can j; eliminate the above problems. j: V: Despite the center drive, however, the scrolling process is interrupted by the current high: and increasing speeds that the high velocity of the winding cylinder and j 30 incoming web induces air movement toward the inlet git between the web and j winding cylinder. blade surface. This creates an overpressure in the friction causing air to penetrate between the winding cylinder and the incoming paper web. Especially le- | :: with knives, high speed machines and low air permeability paper types j: 35 this results in the formation of an air bag just before the winding nip between the winding cylinder and the reel on the winding cylinder side. On the other hand, come again; in spite of the linear pressure of the winding nip, air trapped between the layers penetrates into the nip between the van web and the roll, which loosens the roll! ] i i 3 107327 structure and complicates further processing, especially on slippery paper grades. The air trapped between the top layers of paper to be wound on the reel roll and the rest of the reel may accumulate in the pouch just before the reeling nipple. If these above-mentioned air bags are not controllable, they will cause the roll to crash into the nip and limit the maximum speed of the roll.

A major factor in reducing friction between the paper web and the winding cylinder is the air that is confined between the incoming web and the winding cylinder. 10 With the paper web being very wide in current machines (normally at least 5 m), air trapped under the paper web cannot escape between the web and the cylinder. Various means have been used to eliminate the problem. FI-74446 and FI-98506 may be mentioned as prior art. The previous winding cylinder uses a perforated suction cylinder in which the sheath 15 is torn and a suction box is inserted inside the cylinder, the suction zone of which is arranged in the area where the web touches the surface of the winding cylinder sheath. In order to obtain a negative pressure in the reeling cylinder, air from the cylinder must be led through the cylinder shaft to the suction pump. In FI-98506, grooves are formed on the surface of the winding cylinder sheath with a hole 20 passing through the sheath. A vacuum is applied inside the cylinder by a suction pump which is connected from the inside of the cylinder through the other end of the cylinder. The holes cause pressure loss in the air passing through the jacket at the holes, creating a vacuum inside the cylinder. In the constructions presented in both publications, it is essential that both the perforations and the grooves extend across the entire width of the winding cylinder jacket.

*>. ♦: -i In addition, grooved roller cylinders without suction are used. In this case: Y: the air is directed solely by the grooves. By means of relatively deep and narrow (about 4 mm x about 2 mm) spiral grooves extending from the center to the edges from the center to the edges, air is pumped into the piston between the incoming web and the reeling cylinder and between the reeling cylinder and the reel. To avoid marking by grooves, the sharp edges of the grooves must be j: *: rounded.

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In addition, it has been used in the same way in a spiraling manner from center to edge '. a groove extending across the cylinder width, 1 »4 10732; ' consisting of a low and wide (about 1 mm x about 30 mm) gently sloping "gently sloping" groove. The purpose of this is to eliminate the adverse effects of overpressure on the incoming web-roll nip by allowing a suitable amount of air between the paper layers and conducting | air off. It is also possible to use a combination of deep narrow grooving and gentle grooving. The disadvantage of gentle grooving is that the nip profile becomes complicated because there is little completely flat area on the surface of the reeling cylinder. This can cause problems with thin paper grades.; 10!

Due to the type of loading (loading the reel roll with power units from the ends towards the winding cylinder) and due to gravity deflection, the flow of air is not uniform across the width of the roll and the winding cylinder. Because of the greater load on the edges of the roll, the il-15 land is easier to reach between the web and the roll in the nip between the web and the roll, and despite the slight groove, the air does not escape through tight edges. Reducing the load, in turn, results in reduced line load and too loose roll. Correspondingly, the same non-uniform load distribution in the winding nip causes the air entering between the winding cylinder and the web to pass through the nip between the winding cylinder and the roll better in the center than at the edges.

It is an object of the present invention, while retaining the winding properties of the reel, to provide a cheaper and more economical solution. More specifically, the construction of the roller: V: according to the invention is characterized by what is stated in the characterizing part of claim 1: T. The cylinder according to the invention is in fact characterized by what is stated in the appended claim}

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According to the invention, a groove comprising parallel slanting grooves is formed on the surface of the winding cylinder, the total cross-sectional area of which is greater in the peripheral regions than in the central region. Slight grooving can only be a part. sheathing the periphery of the cylinder so that the center region of the cylinder is smooth, or the center region may be provided with gently grooves of smaller or lesser cross-sectional area. Cylinder casing only; ! I i i l l j i! κ 107327 grooves in the peripheral areas reduce the time required to manufacture the cylinder. Compared to the cylinders grooved on the whole surface with slanting grooves, the center cylinder has a considerably more intact loading surface and a lower risk of marking. The same advantages also apply in cases where the mid-groove grooves are less frequent and / or narrower, leaving a more smooth diaper surface between them than in the peripheral areas. Due to the line load between the winding cylinder and the roll, the grooves at the edges provide air control directed to the right area. Because of the greater amount of smooth loading 10 surfaces, the line load may be lower than that of the cylinders grooved at the same width.

Thus, the cylinders according to the invention always have zones of a certain width at the edges of the jacket, which have a combined cross-sectional area of parallel wide grooves larger than the central area between the zones.

The wide profile of the groove removes the air trapped between the web and the roll. In such a case, it is advantageous to shape the groove profile 20 so that the possibility of sharp edges marking the paper web is minimized. The preferred shape is that the groove has a profile of or about a segment of a circle and has a radius of arc such that the groove becomes 20 to 40 mm wide and the profile shape only about 1 mm or a few millimeters deep. Thus, at the edge 25 of the groove, the risk of marking the paper web is very small.

In the construction according to the invention, no vacuum is required inside the winding cylinder: so that devices for passing air through the shaft and expensive: T: suction pump equipment are not required. In addition, there is no need to drill 30 holes in the cylinder, which is a very time consuming manufacturing step.

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The invention will now be described in more detail with reference to the accompanying drawings, in which the figure 35 schematically represents a pop roller when viewed from the side, however, with only the essential components of the invention shown, 6,107,327! i! Fig. 2 is a front view of the reeling inserter; Fig. 3 is a front view of the reeling cylinder · of the second embodiment; ! Figure 4 illustrates a narrow groove, and Figures 5-9 show sections of the winding cylinder casing so that the grooves machined on the surface are clearly visible.

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Fig. 1 omits to draw the parts of the support frame and the equipment necessary for moving and loading the reel rolls, such as an initial winding device which puts the empty reel rolls over the reeling cylinder to the ends by means of load-transmitting power units.

The actual winding cylinder 1 is mounted on the housing and is powered by the paper machine operating system. Figure 1 shows an empty reel reel 2 ready to be lowered onto the winding cylinder 1.

The paper web W from a paper machine or paper finishing device, such as a coating machine, passes over the winding cylinder 1 for a portion of the circumference of its carpet and weaves onto the reel roll 2 to form an overgrown paper layer, forming a machine reel 2. . j 25: Before the roll is replaced, the reel 2, which is full, is removed from the surface of the winding cylinder 1. The new roll 2 is lowered to the surface of the winding cylinder 1. j: V: The speed of the full reel reel is reduced, and a paper web bag begins to form between the reel cylinder 1 and the: T: reel R, which is blown j 30 around roll 2. The paper web on roll R ruptures immediately and roll R can be taken for further processing. Other means of exchange may also be j

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• # · ·! ! : The surface of the reeling cylinder 1 is machined with a groove 3. Since the paper machines j 35 presently have a very high speed, normally above 20 m / s, air tends to cross between the cylinder and the paper web in the web 4, which is the web W and at the junction of the winding cylinder 1, and j 7 107327 in the winding nip N between the web W and the roll R. The air entrained in the friction 4 tends to reduce the friction between the paper web and the reeling cylinder 1 and to cause the air bag problem described above before the reeling nip N on the reeling cylinder side, causing a friction. In addition, the same air-5 bag hazard is caused by air trapped between the paper layers in the scroll nip, which also causes looseness in the roll. The groove 3 comprises parallel slanting grooves, which will be described in more detail later, to allow air to escape from the roller R under the upper web layers. In the figure, the groove 3 is illustrated with broken lines), and the depth of the groove is exaggerated for the sake of illustration. Similarly, the air bags described above have been depicted with dashed lines.

Fig. 2 is a front view of the winding cylinder 1 according to the invention. The zones 15, symmetrically centered on the peripheral regions 6 of the diaper, preferably having the same width, have a groove 3 which is right-handed at one end and left-handed at the other end. The shape of the groove 3 of the edge regions 6 will be described later.

The cylinder is smooth in the center region 5 of the jacket, i.e. there is no groove 3, or 20 there is a groove 3 as shown in Figure 3 with a total cross-sectional area smaller than in the peripheral regions 6.

Fig. 4 shows, by way of example, a narrow groove 8 with a width of about 1 mm or at most 3 mm. Such a groove, which, according to one embodiment, has a depth greater than the width, removes the air obstructed between the winding cylinder 1 and the incoming paper web W by means of a strain 4. The side walls of the grooves are parallel, but the cross-sectional shape of the groove may be: V: also such that the side walls overlap one another in the bottom direction.

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Figures 5-9 show the shapes of the groove 3 in more detail. If the groove is widened, this will affect the paper web W and the roll # • * rolled on roll R. Between Ian R to remove N obstructed air from the scroll nip. Fig. 5 shows the parallel, wide, gently sloping grooves 7 at the ends of the cylinder having several widths, e.g. at least three times their depth, having a profile of approximately circular segment and having a width is about 20-40 mm and depth is approx.

107327! 8 1-4 mm. The edges or side walls of the groove 7 form a blunt angle l with the smooth casing surface of the cylinder. j \

The proportion of the parallel gently sloping grooves 7 in the diaper cross-sectional area is more pronounced in the peripheral areas 6 than in the central region 5. In Figure 5 this is achieved so that the central region 5 has no gentle grooves 7 and is completely smooth. The grooves 7 of the peripheral area 6 are similar to each other.

Figures 6 and 7 show a case in which the central area 5 also has grooves 10 7. The individual grooves 7 have a larger cross-sectional area in the peripheral areas 6 than in the central area 5. In Fig. 6 this is achieved by having a greater depth 6 than in the central region 5. In FIG. 7, this is implemented in such a way that the width of the grooves 7 is greater in the peripheral regions 6 than in the central region. In FIG. 6, the grooves are flat and 15 in FIG. 7 are flat at the peripheral areas 6 and center region 5, but may be both wider and deeper at the peripheral areas 6. The cross-sectional area of the grooves in the edge regions 6 may also be arranged to gradually increase from the center to the edges. Figure 6 illustrates this possibility in the following way: j

that the grooves 7 deepen towards the edges. I

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Fig. 8 illustrates an alternative where the grooves 7 are at the edge areas 6 with a more shallow spacing than the central area 5. These grooves 7 may be similar to each other. The division of the peripheral region 6 may be constant, or as shown in FIG. 8, may be densified towards the edges. ! '· \ 25 | j: Fig. 9 shows a case with low, slightly broad j: grooves 7 and narrow grooves 8. Such a construction affects both the air exhausted between the web W and j: V: the web narrowed between the winding cylinder 1 and the paper web W to remove obstructed air before the nip. It is preferable that the grooving is made around the jacket of the winding cylinder in the form of a spiral j, i.e. screw-threaded. If a groove having both narrow grooves 8 and wide grooves 7 is desired, the narrow threaded grooves 8 may be pre-

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denote several in parallel nested in a given division, whereby the pitch of each groove 8 j :: is the number x of the parallel grooves 8. Wide adjacent grooves j 4 · · f 35 are made over narrow grooves, for example, so that one. the width of the groove extending in a wide, spiral shape around the cylinder is 9 107327 part of the aforementioned narrow groove pitch and the thread pitch is the same as the narrow groove 8, leaving a flat width of narrow groove 8 between them.

With current running speeds (over 20 m / s) and coated paper grades at even lower speeds, it is preferable to use narrow grooves across the entire width of the diaper. Thus, in all cases of Figures 5 to 8, the narrow grooves 8 may overlap with the wide grooves 7 as shown in Figure 9.

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Fig. 9 illustrates the idea as applied to the embodiment of Fig. 5, that is, the sloping grooves 7 are only at the ends, and in the central region 5 there are only narrow grooves 8, otherwise it is perfectly smooth. In the case where the peripheral areas 6 have both wide grooves 7 and narrow grooves 8 and otherwise the smooth center region 15 has narrow grooves 8, the proportion of grooving on the surface area of the jacket is significantly greater than the peripheral areas 6, e.g. times larger.

When lowered into the reel position, the reel roll 2 initially distributes all of its weight to the reel cylinder 1, but as the roll moves down to a final reel position with roller rails or other support structure supporting the end of the roller small, e.g. less than 15 °, its weight no longer extends to a large extent against the surface of the winding cylinder 1 and thus •: the line pressure against the winding cylinder remains low due to the loading of the ends of the roll 2 • · especially due to bending of long . Another way to increase the line load in the middle would be to bombard the winding cylinder 1. The partial gently grooving of the winding cylinder 1 30 according to the invention, wherein the central portion 5 of the cylinder 5 is substantially smooth or has few gently sloping wide grooves 7, acts in the same direction. The construction according to the invention can thus equalize the line pressure over the entire width of the reel roll.

35 Cylindrical surface grooved with only slightly sloping grooves is cheaper and quicker to manufacture than grooved grooves across the entire width of the jacket or • »»; a smooth roller bombed in the middle. It is also clear that the need for line loading V ·, 0 107327 i is reduced because there is more intact loading line at the center of the cylinder. It is also possible to increase the maximum driving speed, since air behavior can be controlled.

In the construction of the invention, the winding nip N is completely closed at the center and prevents the amount of j higher than the natural roughness volume of the paper from entering the roll R; j: \ j

One useful way to groove the winding cylinder is to machine the grooves into the peripheral areas 6 of the cylinder 10-inch about the length of the cylinder shell from each end. By way of example, a sheet of 9 meters wide paper roll is sheathed at a distance of 1.5 meters from both ends. In the center of the diaper there will then be an unpaved area of j 6 meters. The unpaved area may be narrower, 15 and is preferably at least 40% of the length of the sheath in the axial direction. j i j

Corresponding proportioning can be used for equipping the central region 5 with wide gently sloping grooves 7 with a smaller total cross-sectional area than the peripheral regions 20. j j

Preferably, the direction of the helical thread of the second peripheral region of the sheath of the winding cylinder 1 is opposite to that of the other end, whereby they function in a manner similar to a screw conveyor from the center to the edges, but may also be parallel. The invention is not limited to the shape of the grooves or to the machining of discrete circumferential grooves orbiting one or more continuous circumferential grooves forming a helical thread. According to the invention, it is also contemplated that the aforesaid surface structure may be used in all cylinders intended for the reel nipple - j • · 1; contact with a roll of paper web, such as additional rolls, j

\ carrier roller rollers and printing roller rollers. S

The surface structure of the cylinder according to the invention can be obtained |

by machining the grooves in accordance with the above principles to a full-width cylinder jacket I

. surface or assembling the cylinder in axial direction from successive parts, whereby the various parts already have a suitable structure in the shell surface. In these j j! 107327 11 parts may each have a certain type of groove which is uniform throughout the width of the part, whereby the various parts are combined to form a full-width cylinder of the invention.

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Claims (24)

A wheelchair of a paper web to which a roll-up cylinder (1) is provided with the locking surface (3), wherein in the locking there are 5 parallel longitudinal bars (7), a tambour roller (2), around which the web (W) is rolled into a roller (R), and means for loading the tambour roller (2) and the reel cylinder (1) against each other to effect a reel nip (N) between the reel cylinder (1) and the reel (R), characterized in that the total the cross-sectional area of the locking of the parallel longitudinal lock (7) is larger on the edge regions (6) of the sheath of the reel cylinder (1) than in the middle region (5) of the sheath of the reel cylinder (1). Wheelchair according to claim 1, characterized in that the proportion of the longitudinal slopes (7) of the area of the sheath (s) is larger in the edge areas (6) than in the middle area (5). Wheelchair according to claim 1 or 2, characterized in that the cross-sectional area of individual longitudinal slopes (7) is larger in the edge regions (6) than in the middle region (5). Wheelchair according to claim 3, characterized in that the depth and / or the width of the longitudinal sloping bar (7) is greater in the edge regions (6) than in the middle region (5). :: 25 : 5. Wheelchair according to any of the preceding claims, characterized *: * ·: in that the longitudinal slopes (7) have a tighter distribution on edge areas (6) than on the center area (5). · · · · · · · · Wheelchair according to any one of claims 1-5, characterized in that the center area (5) of the roll-up cylinder (1), on which the total cross-sectional area of the lock-up of the longitudinal lock (7) is * : * less than on edge areas (6), constitute at least 40% of the sheath width. t * • <<4 i * * « Wheelchair according to any of the preceding claims 1-6, characterized in: \. hence, on [at least part of the casing of the reel cylinder (1), they have [[[In longitudinal sloping latches (7) a latch width of 20-40 mm. ! 1 ie 107327 I S \ \ Wheelchair according to Claim 1, characterized in that longitudinal sloping jaw (7) is provided only on the edge areas of the mantle (7), and the center (- | rows (5) of the mantle is left unlocked with longitudinal sloping rafters). Wheelchair according to Claim 8, characterized in that the central region (5) of the reel cylinder (1) which is not provided with longitudinal sloping bars constitutes at least 40% of the width of the sheath. A wheelchair according to any one of the preceding claims 1-9, characterized in that the longitudinal sloping rails (7) are arranged on the surface of the up | the casing of the rolling cylinder (1) as parallel, extending circumferentially around the casing]. Wheelchair according to any of the preceding claims 1-9, characterized in that the longitudinal sloping rails (7) are arranged on the surface of the casing of the rolling cylinder (1) as one or more spiral rails. Wheelchair according to any of the preceding claims, characterized in that on the surface of the reel cylinder there are several more narrow latches (8). A wheelchair cylinder of a paper web intended for nip contact with a roll to be formed by the paper web, wherein the cylinder surface of the cylinder is provided with a latch (3) consisting of j parallel longitudinal latches (7), characterized in that the total cross-sectional area of the housing of parallel longitudinal sloping (7) j ·: ··; the clearance is greater on the edge regions (6) of the sleeve of the cylinder (1) than on j: V: the middle region (5) of the sleeve of the cylinder (1). j! • · »jj Cylinder according to Claim 13, characterized in that the portion of the longitudinal slopes (7) of the sheath area (7) is larger in the edge regions (6) than in the middle region (5). j '... · | • i »· | Cylinder according to claim 13 or 14, characterized in that the cross-sectional area of individual longitudinal slopes (7) is larger in the edge region (6) than in the middle region (5). • * · 3 \ 3 5} '3 5 5 3 i i! 17 107327 Cylinder according to claim 15, characterized in that the depth and / or the width of longitudinal sloping grooves (7) are greater in the edge regions (6) than in the middle region (5). Cylinder according to any of the preceding claims 13-16, characterized in that the longitudinal slopes (7) have a denser distribution on edge regions (6) than on the center region (5). Cylinder according to any of claims 13-17, characterized in that the central region (5) of the cylinder (1), on which the total cross-sectional area of the longitudinal locking (7) locking is smaller than on edge regions (6), constitutes at least 40% of the sheath width. Cylinder according to any of the preceding claims 13-18, characterized in that in at least part of the casing of the cylinder (1), the longitudinal slopes (7) have a clearance of 20-40 mm. Cylinder according to Claim 13, characterized in that longitudinal sloping latches (7) are present only on the edge regions of the sheath (7), and the middle region (5) of the sheath is left unlocked with long sloping latches. Cylinder according to claim 20, characterized in that the center region (5) of the cylinder (1) which is not provided with longitudinal slopes constitutes at least about 40% of the width of the jacket. 25 22. Cylinder according to any of the preceding claims 13-21, characterized in that the longitudinal sloping latches (7) are arranged on the surface of the • V: cylinder (1) sheath running parallel to the periphery of the sheath. : 7: block. 30,., EJ Cylinder according to any of the preceding claims 13-21, characterized in that the longitudinal slopes (7) are arranged on the surface of the casing of the T * cylinder (1) as one or more coil rails. # «• ·« «« «« «« «« Cylinder according to any of the preceding claims 13-23, characterized in. further, that on the surface of the cylinder there are several more narrow latches (8).