AT506370B1 - METHOD FOR ROLLING A FIBERWORK AND A ROLLER - Google Patents

Abstract

Method of improving the degree of material utilization for a reel (1) of a fiber web (W), the method including diagnosis and remodeling, wherein in the diagnosis: -the sizing of a spooling roller (5) is checked to ensure a sufficient carrying capacity, -the one to be produced Fiber track types (W, W01, W02, W03, W04, W0n) are selected for checking, the existing coverage angle (a) is determined, the effect of the coverage angle (a) of the fiber web (W) on the unwinding tension of a rolled-up machine reel ( 6), -the minimum roll-up tension of the fibrous web (W) is set at which the material efficiency is within the target range, -the largest minimum roll-up tension is selected from the group of said selected fiber web types (W, W01, W02, W03, W04, W0n) and in the conversion: the feed of the fibrous web (W) to the reel-up and the overlap angle (a) are changed in such a way that, in the case of a covering deck angle (a) from the group of selected types of fiber webs (W, W01, W02, W03, W04, W0n) can be exceeded, the largest minimum unrolling.

Description

Austrian Patent Office AT 506 370 B1 2012-09-15

Description: The invention relates to a method for improving the degree of material utilization for a fiber web reel-up.

The invention also relates to an upgrade kit for a fiber web reel-up.

There are reelers known for continuously winding the fiber web to a spool roll as a machine roll, wherein in the retractor is a fixed position rotatably mounted reeling drum, which is arranged to generate tension for the fiber web, and press the machine reel against the reeling drum leaves to achieve a line pressure.

A retractor is a device that rolls up a material to be produced as an endless fiber web in roll form as a machine roll. The roll-up parameters to be used for the construction of the machine roll are typically the line pressure, i. H. Pressing force between the reeling drum and the machine reel, a circumferential force to be generated with an axle torque divided by the current radius of the machine reel and the tension of the fiber web in the feed to the reeling drum. Of these roll-up parameters, the peripheral force is not available in so-called Pope reels, since these Pope reels have no axle drives.

Paper, board and corresponding fiber web machines are usually modernized at certain intervals during a usually three decades of continuous operation. These modernizations generally seek to obtain a more efficient and better-than-useful fiber web machine; the type of fiber produced by it corresponds in type and quality to the changing demands of the market that arise over time. Refurbishments and other minor alterations sometimes produce surprising side effects that create a need to change things further in the production process. Such surprising changes, especially in reeling, can cause changes in properties that affect the rollability of the fibrous web. A change in the fiber web can cause surprising roll-up problems, whereby the improvement in the degree of utilization aimed at with a modernization can be canceled out by a deterioration of the degree of utilization for a reel-up, in particular of the degree of material utilization. On the other hand, some changes are not to be seen as Aufrollprobleme. The efficiency of a fiber web machine can be improved as planned by the modernization as planned, but potential for even better performance should be present.

From the prior art WO 03/106313 A1 is known, wherein various feeds of the fiber web are explained to a slitter and possible embodiments, by means of the supply of the fiber web to act on the properties of the roll-up customer role.

The object of the invention is to improve the degree of material utilization for a retractor. The particular aim is to increase the reeling tension generated by the reel-up and thus to reduce the sliding between the fiber web layers occurring in the machine reel. This sliding between the fiber web layers often causes different Aufrollfehler that make noticeable in the subsequent roll-on process as deterioration of the fiber web quality or even as tearing of the fiber web. The degree of material utilization is here in part a statistical quantity, since not necessarily with all rolled-up machine reels a troublesome reeling error occurs per se. However, because of the likelihood of a roll-up error that increases significantly, a change in operating mode made by the operator of the fiber web machine often causes a significant weakening of the material utilization rate. The degree of material utilization can be said to be weak if the material loss during rolling up is at least greater than or equal to 1%. If the loss of material is less than 1% but greater than or equal to 0.5%, the degree of material utilization can at most be considered satisfactory. The purpose of the invention is therefore primarily to improve the material utilization rate during reeling so that the material loss would remain below 0.5%.

A particular purpose of the invention is to offer the technical modernization for an existing reel-up, whose associated with the Aufrollparametern properties are already established with the existing design solutions. The roll-up parameters mentioned may possibly already be used in their entirety, with the reel-up in its current configuration trimmed to maximum performance and thus the full capacity of the reel-up already being used. The purpose of the method is to improve the performance of a reel of a fibrous web: larger than possible machine roles, less Aufrollfehler, more uniform quality, etc. In particular, it can be attempted in certain cases, to act on a caused by rolling bottleneck. In this context, the term roll-up roller is used for the roll-up core, but it can just as well be called a roll-up axis.

For a method according to the invention, it is characteristic that the method includes diagnosis and conversion, wherein in the diagnosis: - the sizing of the spool roller to ensure a sufficient

Carrying capacity is checked, - the fiber webs to be produced which are to be checked are selected, [0012] the existing covering angle (a) is determined, the effect of the covering angle (a) on the fiber web the reeling tension of the rolled-up machine roll is determined, the minimum reeling tension of the fiber web is determined at which the material utilization rate is within the target range, - the largest minimum of the group of said selected fiber web types

Roll-up tension is set; And wherein during conversion: - the supply of the fiber web to the retractor and the coverage angle (a) are changed such that at a coverage angle (a) the largest minimum Aufrollspannung can be exceeded from the group of selected fiber web types.

For the upgrade kit according to the invention is again characteristic that the upgrade kit as a professional service to be performed diagnosis according to claim 1 and structural conversion components for changing the feed of the fiber web to the reel comprises such that at a coverage angle (a) the largest minimum Aufrollspannung can be exceeded from the group of selected fiber web types.

For a reel it is advantageous that the fibrous web on the reel drum from a direction occurs in which the overlap angle (a) between 172 ° and 210 °.

With an overlap angle (a) in this context is meant the angle of rotation of the reel drum which the fibrous web covers on the surface of the reel drum and which overlap angle begins with the touch contact and ends in the nip between the reel drum and the machine reel. Feed means in this context the track to be traversed by the fibrous web or the route selected for transport, or at least part of the route which begins in the running direction of the fibrous web at the earliest with the process phase before reeling and ends at the latest in the nip between the reeling drum and the machine reel ,

A first aspect of the method according to the invention is a modernization-related diagnosis of the existing situation, which is carried out to the extent as shown in the patent claims. In this way, a possible bottleneck is identified when rolling up and gained sufficient knowledge of the boundary conditions in the existing situation. In the dependent claims and in a later phase the explanation is described with advantageous optional further features.

A second aspect of the invention is the actual conversion to be performed on the construction. According to the invention, the increase in the reeling tension is effected in a very advantageous manner by increasing the coverage angle. The power of the electric drives of the retractor need not be increased during the conversion, as this would also presuppose to change the mechanical construction of the retractor. The construction / mechanical stability of the retractor also need not be changed, for example because of a larger line pressure. Also, the tension of the fibrous web in front of the reel need not be changed, but can be controlled in terms of the running behavior of the fiber web machine to an appropriate value. The tension of the fibrous web in front of the reel-up is a very important factor affecting the running behavior, since the effect of the tension on the susceptibility of the fibrous web to tearing is considerable. The above reduces the implementation or cost risks compared to other possible ways of reducing or increasing the unwinding tension. As a particularly advantageous feature it follows that the rated life does not change at all.

In the following, the invention will be described in more detail with reference to the accompanying figures, in which Fig. 1 shows a reel-up according to a conventional embodiment, in Fig. 2 a reel-up according to Fig. 1 after a successful rebuilding FIG. 3 shows a feature of the invention, namely the minimum reeling tension at different fiber web grades, FIG. 4 shows a test run geometry for a reel-up used for the examination of the invention, [0027] FIG. Figure 5 shows in graphic form the results of the above examination, Figure 6 shows an example of an upgrade kit according to the invention, Figure 7 shows an advantageous embodiment in which a spreader roller is shown is positioned under a reel drum.

In Fig. 1, a retractor 1 is shown according to a conventional embodiment. Here, the fiber web W is supplied via a guide roller 30 and a spreader roller 50 of a reeling drum 10 such that forms an overlap angle α of about 130 ° before the nip between the reeling drum 10 and a machine reel 6. Such a configuration is a typical example in the case of paper machines.

In most of the reels in operation for a fibrous web, the feeding of the fibrous web in front of the reel-up is carried out in such a way that the overlapping angle which arises over the reeling drum has an order of magnitude of approximately 130 [deg.]. This overlap angle value is functional in itself, in particular if, with regard to the feed of the fiber web, other necessary circumstances to be considered are taken into account. Such factors which are decisive for the selection are, inter alia, the embodiment for the introduction into the reel-up, various measuring instruments, measuring frames and the like positioned in front of the reel-up, as well as the other construction of the reel-up as such. In various cases, when a movable reel drum is used to produce the line pressure, reels with an overlap angle of about 180 ° are common. In this case, a fiber web that enters vertically in relation to the direction of the line impression does not interfere with the line pressure. In certain cases, reels are available in which the overlap angle is significantly smaller, about 90 °. In certain situations, the reelator requires more performance, whereby a specific improvement in the tension of the machine reel can be achieved by deliberately changing the overlap angle. This roll-up parameter can be used especially in cases where other possible solutions have already been tried and more performance is not easily achieved.

A feature of the method according to the invention is a diagnosis of the existing situation. This process includes the actions outlined below.

Review of the sizing of the spool roller to ensure a sufficient load capacity. This process is usually necessary because a significant change in the degree of utilization can be achieved by a larger machine roll 6. Sometimes spool rollers are already overloaded, after which it is necessary to reduce the target size. In a reverse situation, it is possible to increase the size of the machine roll. This process is also important in terms of safety.

Selection of fiber webs W, W01, W02, W03, W04, WOn to be produced for verification. The range of grades that can be produced with a fiber web machine is quite extensive, so the review must be limited and its priority set. When selecting the fiber web types W, W01, W02, W03, W04, WOn to be tested, the main fiber web types W, W01, W02, W03, W04, WOn are advantageously used as selection criteria for the production of the fiber web machine in such a way that in the checking phase , advantageously to five or seven of the most relevant fiber webs W, W01, W02, W03, W04, WOn are selected for review. Thus, one obtains a suitable sample of the production, which usually covers the majority of the particular commercially relevant or most-produced fiber web types, for example, 60-85% of production. If one of the types of fiber web differs greatly from its properties in comparison to the other selected types of fiber web, then this different type of fiber web may possibly be disregarded. In this case, a situation is avoided in which a deviation from the main trend would yield a very different final result in the diagnosis or that the diagnosis would lead to a false or misleading conclusion.

Determining the existing coverage angle (a). This is the basic starting point for performing a situation assessment.

Determining the effect of the overlap angle (a) of the fiber web on the reeling tension of the rolled up machine reel. This can be done either in a pilot environment with a trial reel or, if possible, with a measurement / setup in a production environment. In most cases, this is easiest with conducting a pilot test. Even mathematical simulation models can give a sufficiently accurate calculation or estimate.

Determining the minimum Aufrollspannung the fiber web, in which the material utilization is in the desired range. In this case, for example, the machine roll causes no material loss due to slippage. The target range for the material utilization rate is of course a parameter dependent on the starting position, but one should always aim for the best possible final result. This would be desirable for economic and environmental reasons alone. However, when modernizing reels it should be remembered that a significant amount of factors affect material utilization.

Determining the largest minimum reeling tension from the group of said selected fiber web types W, W01, W02, W03, W04, WOn. In this way, one obtains a value that is valid for all selected fiber web grades. In Fig. 3, such a situation is shown in which the rolling-up stresses are set for each of the fiber web types W01, W02, W03, W04, WOn. The largest minimum roll-up tension WOTmin of the group is represented by a dashed line (WOTmin). Of course, excessive tension should be avoided.

The effect of the fiber tension on the rollability can be in sufficient Austrian Patent Office AT506 370B1 2012-09-15

Clarify the extent with the help of the above-mentioned, belonging to the diagnosis measures, inter alia, with respect to the reeling and the invention. A useful further indication would be the determination of the grip between fiber web and reeling drum, but this parameter depends not only on the properties of the fiber web type but also on the operating speed, so that it is not very easy to define. The available maximum line pressure and the maximum tension of the fiber web before the reeling drum for different types of fiber webs are data that should be taken into account in a diagnosis.

The tension of the fiber web W before the reeling drum 10 is thus advantageously set to an optimized value with regard to the running behavior of each type of fiber web W, W01, W02, W03, W04, WOn for the diagnosis. Likewise, the line pressure N between the reeling drum 10 and the machine reel 6 is advantageously set to an optimized value for the running performance of each type of fiber web W, W01, W02, W03, W04, WOn for the diagnosis.

Based on the diagnosis, the conversion can be carried out, wherein during the conversion: - the supply of the fiber web W to the retractor and the overlap angle (a) are changed such that with the help of the overlap angle (a), the largest minimum unwinding the group of selected fiber webs W, W01, W02, W03, W04, WOn can be exceeded. In an advantageous case, in particular associated with a modernization, the aim is to make the overlap angle as large as possible, so that the control of the fiber web (coverage angle requirements of guide, tension measuring and spreader rollers are met) and the introduction of the fiber web (space for insertion devices, in particular insertion transport devices) continue to function and existing spare rollers and components can be used if possible (minimizing the delivery time and quantity of spare parts). Furthermore, as the setpoint for the conversion, the increase in the reeling tension can be more than 15%, advantageously more than 20% and most advantageously more than 25%. Accordingly, the coverage angle (a) is increased by at least 5 ° in the change. In this way, an advantageous end result can be seen that the coverage angle (a) is changed during the conversion so that after the conversion, the value of the coverage angle (a) is 172 ° -210 ".

In Fig. 2, a possible final result after the implementation of the conversion is shown. In Fig. 2, a reel 1 for continuously winding a fiber web Wum a spool roller 5 is shown as a machine reel 6, wherein in the retractor 1 is a fixed position rotatably mounted reeling drum 10, which is arranged to generate tension for the fiber web W and the Machine roll 6 can be pressed against the reeling drum 10 to achieve a line pressure N, wherein the fiber web W impinges on the reeling drum 10 from a direction in which the overlap angle α is between 172 ° and 210 °. According to an alternative embodiment, the fiber web is fed almost vertically to the reeling drum 10 via a spreader roller 50 and a guide roller 30.

In Fig. 4, a trial used in a test run is shown in the reel on the various feeds of the fiber web to the reeling drum are realized to investigate the different effect of different coverage angles. The effect of the overlap angle on the stress was investigated by means of a separate tension measuring roller, the winding tension WOT (wound-on-tension) arising on the roll. The machine reel to be rolled up is at an angle of approx. 45 ° to the reeling drum. The overlap angle of the fiber web entering the reeling drum is changed such that the cover angles to be examined are 0 °, 85 °, 13 ° and 210 °. The other operating parameters are the line pressure to be kept constant, the tension of the incoming web and the peripheral force (axle moment) of the machine roll. The results of this study are shown in FIG.

From Fig. 5 shows how WOT (Wound on Tension, Y-axis) changes depending on the overlap angle (Wrap angle [deg], X-axis). The test run in an example case 5/14 Austrian Patent Office AT 506 370 B1 2012-09-15 was carried out so that in the first test series the line pressure 2 kN / m, the fiber tension before the reel-up 200 N / m and the peripheral force 600 N / m. m. In a second test run, the line pressure was 6 kN / m, the fiber web tension before the reel-up was 500 N / m and the peripheral force was 600 N / m. In both series of tests, the fibrous web was of the same variety. The investigations showed that these results could be achieved almost independently of the fiber web grades.

The industrial application of the invention is advantageously achievable by packaging the process as a product. The product may consist of an upgrade kit for a reel-up 1 of a fibrous web W which performs as a professional service a diagnosis to be made according to claim 1 and structural conversion components for changing the feeding of the fibrous web W to the reel 1 such that at a coverage angle α the greatest minimum reeling tension can be exceeded from the group of selected fiber webs W, W01, W02, W03, W04, WOn. The conversion components belonging to the package may include, for example, supports 31 of a guide roll 30 located in front of the reeling drum 10, supports 41 of a tension measuring means 40 (tension measuring roll or equivalent) located in front of the reeling drum 10, support 51 of a spreading roll 50 located in front of the reeling drum 10. In some cases, the fiber web tension is to be relaxed such that the tension (moment) of the reeling drum 10 does not affect the fiber web tension in the fiber web part in front of the reeling drum. In this case, the package may advantageously contain a relaxation roller 30, including carriers 31, located in front of the reeling drum 10. Furthermore, in most cases, when the fiber web feed is changed, the launch should be scheduled to match the changed situation. Here are also newly to be arranged, located in front of the reeling drum 10 insertion devices 60 together with carriers 61 to the conversion components.

In Fig. 6, the conversion components of an example case are shown. This presentation list is not complete or the only alternative, but in the sense that it gives an idea of the scope of the work to be performed. The conversion components include the following points located in front of the reel drum 10 and the machine reel 6: a new guide roll 30 and guide roll drive, new guide roll supports 31, new tension sensors 40 and supports 41, a new position and new supports 51 for the spreader roll 50, and foundations for the spreader roll, modification and installation of an insertion device 60 and of supports 61, modification of the foundation 71 for a measuring frame 70 (scanner). Any other items (not shown in the figure) may be a new intermediate beam position, a new routing, wiring, purging and testing of intermediate beam tubes, a new hole detector position, a new marker position, etc.

In connection with the diagnosis explained above, a diagnostic tool suitable for this purpose helps considerably in the systematic detection and clarification of the situation.

After the advantageous further feature shown in Fig. 7, the spreader roller 50 is located below the reeling drum, where the spreader roller 50 can be arranged in contact with or in the vicinity of the reeling drum 10. The stretching action of the spreader roll rapidly decreases after the spreader roll, and therefore in the case of coated / rewetted / wet stretchable papers, or more generally in the case of a fibrous web, it is advantageous to position the spreader roll 50 near the next breakpoint (in this case, the roll nip). so that the stretching effect prevents the formation of wrinkles. Furthermore, if the surfaces of the reeling drum 10 and the spreader roller 50 are in contact with each other, such a property is achieved, among others, that the spreader roller 50 is available as a relaxation roller. 6/14

Claims (13)

Austrian Patent Office AT506 370B1 2012-09-15 IN THE FIG. REFERENCE SYMBOLS USED: 1 reel-up 10 reeling drum 5 spool roller 6 machine reel 30 guide roller 31 carrier 40 tension measuring means 41 carrier 50 spreader roller 51 carrier 60 insertion devices 61 carrier 70 measuring frame 71 carrier W fiber web W01 fiber web type 01 W02 fiber web grade 02 W03 fiber web grade 03 W04 fiber web grade 05 WOn fiber web grade On N line print A method for improving the material efficiency for a retractor (1) a fiber web (W), characterized in that the method includes diagnosis and conversion, wherein in the diagnosis: - the sizing of a spool roller (5) to ensure a sufficient Carrying capacity is checked, - the types of fiber webs to be produced (W, W01, W02, W03, W04, WOn) are selected for checking, - the existing covering angle (a) is determined, - the effect of the covering angle (a) on the fiber web (W ) to the reeling tension e the minimum unrolling tension of the fibrous web (W) is set at which the material efficiency is within the desired range, the largest minimum reeling tension from the group of said selected fiber web types (W, W01, W02, W03, W04, WOn), and wherein during conversion: the feed of the fiber web (W) to the reel-up and the coverage angle (a) are changed such that at a coverage angle (a) from the group of selected fiber web types (W, W01, W02, W03, W04, WOn) the maximum minimum reeling tension can be exceeded. 7/14 Austrian Patent Office AT506 370B1 2012-09-15 2. The method according to claim 1, characterized in that the tension of the fiber web (W) before the reeling drum (10) with regard to the running behavior of each type of fiber web (W, W01, W02, W03, W04, WOn) for the diagnosis advantageously to an optimized Value is set. 3. The method according to claim 1, characterized in that the line pressure (N) between reeling drum (10) and machine roll (6) with regard to the running behavior of each type of fiber web (W, W01, W02, W03, W04, WOn) for the diagnosis advantageous an optimized value is set. 4. The method according to claim 1, characterized in that in the selection of fiber webs to be produced (W, W01, W02, W03, W04, WOn) for review advantageous as selection criteria, the main fiber web types (W, W01, W02, W03, W04, WOn ) are used for the production of the fiber web machine in such a way that in the checking phase one, advantageously to five or seven of the most relevant fiber web types (W, W01, W02, W03, W04, WOn) are selected for checking. 5. The method according to claim 1, characterized in that as a setpoint during the conversion, the increase in the reeling tension over 15%, advantageously over 20% and most advantageously over 25%. 6. The method according to claim 1, characterized in that the overlap angle (a) is raised during conversion by at least 5 °. 7. The method according to claim 1, characterized in that the overlap angle (a) is changed during the conversion such that the value of the overlap angle (a) after the conversion 172 ° - 210 ". 8. Upgrade kit for a reel (1) of a fiber web (W), characterized in that the upgrade kit as a professional service comprises a diagnosis to be performed according to claim 1 and structural remodeling components for changing the supply of the fiber web (W) to the reel-up (1) in such a way, in the case of a coverage angle (a), the greatest minimum reeling tension can be exceeded from the group of the selected fiber web types (W, W01, W02, W03, W04, WOn). 9. Upgrade kit according to claim 8, characterized in that belonging to the said conversion components carrier (31) located in front of the reel drum (10) guide roller (30). 10. Upgrade kit according to claim 8, characterized in that belonging to said conversion components carrier (41) of a before the reeling drum (10) voltage measuring means (40). 11. Upgrade kit according to claim 8, characterized in that belonging to the said conversion components carrier (51) located in front of the reel drum (10) spreading roller (50). 12. Upgrade kit according to claim 8, characterized in that the said conversion components located in front of the reel drum (10) relaxation roller (30) including carriers (31). 13. Upgrade kit according to claim 8, characterized in that belong to said conversion components carrier (61) of insertion devices (60) which are located in front of the reeling drum (10). For this 6 sheets drawings 8/14