FI119980B - Method in connection with a fiber web machine reel - Google Patents

Description

The invention relates to a method according to the preamble of claim 1 in connection with a fiber web machine reel,

It is known in the art to use reels for fiber web machines, such as paper and board machines, in which a web made of fiber web machines, such as a paper-10 machine / board machine, is rolled into a full-width web for machine processing. The web is wound on a reel sales member, for example, around a reel iron / roll, either through a surface draw in a winding nip between the reeling cylinder and the forming web roll, or utilizing a center drive, wherein the reeling shaft is also provided. 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.

As is known in the art, the machine reel of a fiber web machine is constructed by means of winding parameters of the reel 20 such that the roll is resistant to braking, acceleration, short-term storage, and is easily and error-free in the next process step. The final roll structure is only formed during the unwinding, as errors can occur on the roll during all preceding process steps. The roller roller is used to adjust the roller structure sufficiently tight for further processing to adjust roller parameters such as nip force, circumferential force and web tension. The roll quality and structure have been monitored, for example, from the roll surface to the roll by means of hardness sensors and / or manual roll surface sensing to detect possible winding defects.

30 2

In prior art methods, it has been very difficult to determine, for example, local tangential and radial stresses within the roll, because it is difficult, even impossible, to place the measuring sensors inside the roll at high speeds and because the sensors easily break the web. Such sensors also do not invert the actual situation as the sensor increases local tension. Also known in the art are roller construction tests in which a measuring strip (puli tab) is fed along the web to the roll / roll surface and upon completion of the roll, the strip is pulled out and a tensile force proportional to the interlayer radial pressure is measured. These pull tabs have thus been able to determine the internal radial pressure of the 10 rolls at the end of the machine or customer roll, but it is not possible to obtain more precise information about the internal structure of the roll by this method. For these reasons, winding defects have mainly been identified in unwinding, but at this stage it is no longer difficult to correlate with the cause of the defect.

15

With respect to the prior art, reference may be made to Fl Patent 105803, which discloses a method of continuous unwinding of a paper web, which measures the shape of the outer surface of a roll of unwound paper in order to detect any defects in the paper roll.

20

In the prior art, reference may be made to International Patent Application PCT / DE98 / 03204, which teaches the neural network measurements that correlate with winder roll quality, such as web tension, the number of paper layers in the roll, and the radius of the roll. According to the publication, a trained neural network 25 uses these factors to adjust the roll quality. The disclosure describes the control algorithm used but not the actual method for measuring the quality of the seal.

As the roller speeds increase and the web quality level (smoothness, density, gloss, etc.) increases, the risk of machine roll breakage increases. A small momentary profile error 30 or a malfunction in the winding parameters may cause the machine roll surface layers to be damaged, which is a major safety hazard as it can cause personal injury as well as material! i wah inkoj ak in.

The object of the invention is to eliminate or at least minimize the drawbacks and problems of the prior art arrangements described above.

It is an object of the invention to provide a system for measuring and controlling the winding quality suitable for connection to a fibrous web mill, closed or unwind, by which the internal quality of the machine reel can be determined and controlled.

10

A more specific object of the invention is to eliminate the problems associated with the potential risk of machine roll reeling.

In order to achieve the foregoing and further objects, the method according to the invention is essentially characterized in what is set forth in the characterizing part of claim 1.

According to the invention there is provided a measurement based detection and control system for possible pulse-like winding faults, which is applicable at one or more winding points. A pulse-like scrolling defect is a single scrolling defect that can be detected by a sudden change in the circumference of the roll in a machine direction of up to one turn, that is, detectable by a pulse when the roll spins an entire revolution.

According to a preferred embodiment of the invention, the measurement is carried out by placing the measuring probe (s) or the like on the surface of the nip forming roll or the like with the roll to be rolled. Such a roll may be a winding shaft, a carrier roll, a weight roll, or a separate roll arranged with a nip contact roll.

According to a preferred embodiment of the invention, in connection with the winding of the fiber web, the roll profile and preferably the nip force profile with the roll to be rolled are spirally or circumferentially extending over all or part of the circumferential path 5. Measurement results provide information on sudden changes in the profile indicating roll damage and on-going roll break.

The preferred embodiment of the invention described above is preferably used in a winding 10 which uses a pressure sensitive film called EmFi film for measuring nip load, through which the nip load and the transverse profile of the nip force can be easily and accurately measured. From the measurement signal of such a film measuring application, it is also possible to detect winding defects by providing the measuring equipment with additional sensors or suitable electronics, if necessary. The measurement results 15 can also be used to form a machine roller defect map to prevent defects already during the roll-off phase.

Applying the preferred embodiment of the invention described above in connection with a reel winder during winding, any winding defects in the reel are detected from the measurement signal of the 20 pressure sensitive diaphragm sensors, for example by the same principle as hand sensing defects in the reel surface. At the same time, the invention provides an indication of a roll explosion when the measurement signal indicates the precursor of roll surface breakage, whereby the explosion can be prevented by cutting off the incoming track and terminating the roll before the explosion.

By applying the above-described preferred embodiment of the invention, a pressure sensitive membrane sensor is placed on the surface of the roll in contact with the unwindable roller to detect the winding defects caused by the winding and the corresponding faults that can be eliminated, for example, with a spacer by changing the reel structure during the reeling of the spacer, for example by rolling the roll bottom tighter; necessary traversal parameter changes and / or precautions, pressure according to a preferred embodiment of the invention the diagnostic based on a sensitive membrane sensor is applicable to fasteners, subwindows and unwound rewinders. In the case of fasteners, the invention can be applied in the prevention of roller explosion and in the identification of a break point caused by a satanic or crepe rush both in unlockers and fasteners. Part-15 web winders through the invention provide the above-mentioned aspects. The invention is also applicable to the coating or calender unwinding roller, whereby a roller having a pressure sensitive film sensor, which can also act as a tail catcher in a stall situation, is placed in a suitable position in connection with the unwinding roller, e.g. Thus, in these applications, it is possible to cut off the web or stop the machine before the bottom bundles, i.e., the crepe bundles, and to detect possible roller defects not detected in previous measurements or prevent them from accessing the coating stations or calender, risking breakage or web breakage.

25

In some other preferred embodiments of the invention, a microwave radar or laser is used in place of a pressure sensitive membrane sensor to indicate satin, i.e., crepe rattles and other winding defects. In this case, the necessary measuring devices for measuring the radius of the roll and the shape of the surface of the roll surface 30 and slightly inside the surface are mounted in connection with the roller. The measuring sensors can be located either locally at the desired measuring points or use scanned measuring in the desired area. The processing of the measurement data and the identification of possible winding defects occurs either by following a direct measurement signal or by generating a spectrum of the measurement signal. The tracking of a direct measurement signal is based on detecting the shape of the signal given by the coil error and continuously comparing the measured signal with a known signal.

5 Spectrum Review deals with processing multiple measurement reels for measurement data. The potential risk of roll breakage is identified as early as possible so that the process can be interrupted before the roll surface of the machine rolls. This can minimize or even eliminate security risks and damage. For example, in the event of a risk, the running speed may be reduced, the strip of 10 lane or emergency stop may be performed.

According to one embodiment of the invention, a microwave, infrared or similar radiation-based measuring method is used in connection with winding, for both winding and unrolling, for measuring the surface of the machine roll and for the underside of the surface. Preferably, the measurement extends from the surface of the machine roll to a depth at which individual web layers turn into rolls, preferably to a depth of about 10 to 50 mm. In accordance with a further feature of the invention, the measurement depth is determined such that, if necessary, there is still a flying seal or diameter change, that is, from a second to a few minutes. The measurement signal is integrated with a data processing device 20 such that a continuous measurement signal of the structure of the reeling machine reel from the bottom to the surface of the reel is provided in the reel. The measurement measures the effect of the winding parameters on the winding and unwinding. A similar measurement is performed in the opposite direction, whereby the measurement also shows the change in the roll weight of the web rolled inside the machine roll and the roll structure and possible winding defects. The measurement data of the take-off and unwinding is combined so that the corresponding position on the roll is at the same point on the curve to obtain the roll structure adjusted for the rewinding parameters for its own curve and the corresponding unwinding machine roll structure and possible winding defects on its own. The measuring system then compares the winding and unwinding measurement results and seeks to establish a correlation between them, whereby the winding control system can predict the structure of the finished machine roll, e.g. The scroll quality management system may be an expert system, a neural network or fuzzy logic. The intelligent system learns the correlation between the quality indicator of the winding 5 and the changes in the winding and any faults, whereby the winding parameters of the winding can be optimized so that the machine reel remains good at unwinding. The arrangement according to this embodiment of the invention is applicable both to the winding and unwinding of the machine rolls and to the unwinding and winding of the length cutters.

10

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

Fig. 1 schematically illustrates an embodiment of the invention in which winding defects are detected from the measurement signal of a pressure sensitive diaphragm sensor during winding.

Fig. 2 schematically illustrates an embodiment of the invention with a nip open roller.

Figure 3 schematically illustrates a measurement arrangement applicable to the invention.

Figure 4 is a diagrammatic representation of one exemplary result of a measurement intended to anticipate a machine roll explosion.

Fig. 5 schematically shows an example result of the integral quality of continuous machine roll measurement.

30 8

Unless otherwise indicated, the same reference numerals are used throughout the figures and in the description thereof.

Fig. 1 schematically illustrates a fastener 10 for winding the fiber web W into a machine roll 11 via a roller n N between the milling cylinder 12 and the forming machine roll 11. A pressure sensitive diaphragm sensor 13 is attached to the surface of the winding cylinder 12, for example an EMFI sensor, which measures the cross-sectional profile of the nip force. The measurement signal may also identify winding defects, for example, a change in the measurement signal caused by a probe V in the dough W, or an IPR caused by the air bag ennen formed in the air bag ΪΡ formed before the winding-10 nip N.

Fig. 2 schematically shows an unwinding roller 20 for unwinding a fibrous web W from a machine roll 21 in which the web is wound around a winding shaft 22 or a corresponding winding core 15. Connected to the machine roll 21 is a nip roll 23 which is in contact with the machine roll 21 during unwinding. In the embodiment shown in the figure, during unwinding, the winding axis moves as indicated by arrow S, so that the contact is maintained. On the other hand, more commonly, the nip roller 23 is moved during unwinding so that contact is maintained during unwinding. The unwindable fibrous web W 20 is fed to the first guide roll 24 and further processed, for example, to the slicers 30.

25

3, the measuring system 40 comprises a machine roll 11; 21 measuring sensor (s) 13 connected thereto; 25, for example, pressurized a film diaphragm sensor, microwave sensor, infrared sensor, etc., for measuring machine roll 11 during winding, closing and / or unwinding; 23 surfaces and 30 if desired / depending on the measurement method, slightly below the surface, for example 10-50 mm below the surface. The measurement results are transmitted to a computer 41 for analyzing the background results, and, if necessary, information is transmitted to the scroll control system to perform the necessary corrective actions, shutdown, or the like. The scroll quality management system may be an expert system, a neural network or fuzzy logic. The intelligent system learns the correlation between the winding quality meter and the changes and unwanted defects in the winding, thereby optimizing the winding parameters of the winder so that the machine roll remains good at unwinding.

In the example shown in Fig. 4, the processing of measurement data and the identification of possible winding defects is done either by following a direct measurement signal or by forming a spectrum of the measurement signal. The tracking of a direct measurement signal is based on detecting the signal form provided by the mapping error and continuously comparing the measured signal with a known signal. Spectrum review deals with the processing of measurement data for multiple windings. The potential risk of roller ha-15 roll is identified as early as possible so that the process can be interrupted before the roll of the machine roller disintegrates. This can minimize or even eliminate security risks and damage. For example, in the event of a risk, the running speed may be lowered, the web cut off or an emergency stop performed.

The example shown in Fig. 5 illustrates an analysis result obtained in the system of Fig. 3, in which the measurement signal is integrated with a data processing device such that a continuous measurement signal is obtained from the reeling machine reel. The upper curve 51 represents the unwinding and the lower curve 52 represents the unwinding. The vertical Y-axis is denoted by the bottom deflection-25 boundary 53 by the unwinding roller and the bottom deflection limit by the scrollwheel 54. The horizontal X-axis represents the diameter of the roll. The measurement measures the effect of the winding parameters on the winding winding to obtain a measurement result from the structure of the machine reel, from the quality of the reel from the bottom to the surface. In the unfolded direction, a similar measurement is made in the opposite direction, whereby the measurement also shows a change in the roll structure due to the weight of the web roll 30 and the deflection of the winding axis and possible winding defects. The winding and unwinding measurement data may be combined so that the corresponding roll position is at the same position, resulting in a roll structure adjusted to the winding parameters for its own curve 52 and a corresponding roll unwinding machine structure and possible roll defects to its own curve 53. 5 and winding measurement results and strives to establish a correlation between them, whereby the structure of the finished machine roll can be predicted in the winding control system, for example by determining the tension of the bottom of the roll so that bottom defects are eliminated and the bottom density is appropriate.

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

Claims (7)

A method in connection with a fiber web winder, wherein the fiber web (W) is wound up and / or unwound and the property of forming and / or forming a winding fiber web roll (11; 21) is measured by at least one measuring sensor (13; 25). the method of processing measurement results for detecting a sudden change in circumferential direction of the fiber web reel (11; 21) for detecting and identifying pulse-like winding defects for determining and controlling the internal quality and structure of the fiber web reel (11; 21); Method according to Claim 1, characterized in that the method comprises processing the measurement results for detecting a sudden change occurring during a maximum of one winding cycle. 15 Method according to claim 1 or 2, characterized in that the method measures the effective and / or formed property of up to one revolution of the roll. Method according to one of Claims 1 to 3, characterized in that in the method the measuring transducer (s) (13; 25) is placed on a surface of a roll (12; 23) or the like which is nip in contact with the roller (11; 21). Method according to one of Claims 1 to 4, characterized in that in the method the sensing sensor (s) are pressure sensing diaphragm sensors and the roll profile is measured and preferably the nip force profile and the measurement results provide information on sudden changes in the profile beginning roll breakup. Method according to one of Claims 1 to 3, characterized in that a non-contact microwave radar or laser sensor is used as the measuring sensor (s), Method according to one of Claims 1 to 6, characterized in that, in the method, a measuring system (40) is formed in connection with the winding, by which the measurements are performed and the measurement results are processed and the measurement results are transmitted to the winding control system. 10