EP0754159A1 - Method of initiating the premature replacement of a roll of material - Google Patents

Method of initiating the premature replacement of a roll of material

Info

Publication number
EP0754159A1
EP0754159A1 EP95915861A EP95915861A EP0754159A1 EP 0754159 A1 EP0754159 A1 EP 0754159A1 EP 95915861 A EP95915861 A EP 95915861A EP 95915861 A EP95915861 A EP 95915861A EP 0754159 A1 EP0754159 A1 EP 0754159A1
Authority
EP
European Patent Office
Prior art keywords
roll
temperature
web
sleeve
unwound
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95915861A
Other languages
German (de)
French (fr)
Other versions
EP0754159B1 (en
Inventor
Hans-Helmut JÜHE
Matthias Rauhut
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stora Publication Paper AG
Original Assignee
Stora Feldmuehle AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE4442154A external-priority patent/DE4442154A1/en
Application filed by Stora Feldmuehle AG filed Critical Stora Feldmuehle AG
Publication of EP0754159A1 publication Critical patent/EP0754159A1/en
Application granted granted Critical
Publication of EP0754159B1 publication Critical patent/EP0754159B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/10—Changing the web roll in unwinding mechanisms or in connection with unwinding operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H26/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H26/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms
    • B65H26/08—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms responsive to a predetermined diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/10—Size; Dimensions
    • B65H2511/14—Diameter, e.g. of roll or package
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/50—Occurence
    • B65H2511/52—Defective operating conditions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/40—Temperature; Thermal conductivity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
    • B65H2557/50—Use of particular electromagnetic waves, e.g. light, radiowaves or microwaves
    • B65H2557/512—Use of particular electromagnetic waves, e.g. light, radiowaves or microwaves infrared

Definitions

  • the present application relates to a method for initiating a premature roll change of a web to be unwound from a sleeve, in particular a paper web.
  • sleeves stands for drum, winding cores made of cardboard or metal.
  • the present invention has for its object to provide a method that creates a possibility for the early detection of defects occurring in the core area in the manufacture of rolls with large roll diameter and large web width, especially in the paper industry, so that the production of Large rolls are made possible until their physical winding limits are used and the number of remaining layers that is necessarily left on the core is minimized.
  • the inventors have now recognized that within a certain region of layers of the paper web lying adjacent to the sleeve, certain temperature phenomena can occur which result in Let early detection of defects take advantage of and enable the initiation of a roll change before the defects result in the web being torn off.
  • the temperature phenomena mentioned are punctiform or sheet-like locations with a temperature which is increased by a few tenths of a degree Celsius. These points are not to be confused with ring-shaped temperature phenomena, which can also be observed in the core area and which have an elevated temperature in comparison to the layers of a material web which are further away from the sleeve.
  • the invention therefore proposes a method for initiating a premature roll change of a web to be unwound from a sleeve, in particular a paper web, which is characterized by the combination of the following features:
  • the temperature is measured with a non-contact temperature measuring device, while the roll has 100% to 60% of its mass during the winding or unwinding process, in a zone which is up to 150 mm in the radial direction from the surface of the sleeve,
  • the radial Distance from the sleeve surface determined - the determined distance is stored to trigger a signal that triggers the roll change when the distance is reached.
  • the paper comes out of the dryer section of the paper machine at a high temperature.
  • the temperature in the core area initially drops significantly the further the drum moves away from the nip. If the mass of the paper roll grows above 60% of the final mass of the finished roll, the tendency of falling temperature in the core area subsides significantly.
  • the trend of falling temperatures reversed and the temperature rose in a zone which is approximately 5 to 150 mm, in particular 10 to 80 mm, from the surface of the sleeve.
  • a ring-shaped temperature point just a few mm wide formed in the edge region of the roll within the zone. Detected temperature differences of ⁇ 0.5 ° C at point or area-shaped locations within the narrow, ring-shaped ones Temperature point - in comparison to cooler adjacent areas of the annular temperature point - indicate defects that can lead to tears in the subsequent processing.
  • the method according to the invention enables the detection of defects for the first time by means of temperature monitoring.
  • both end faces of the roll are monitored, since defects can occur arbitrarily in the edge region on one of the two sides and in no way have to occur on both sides at the same time.
  • the processing process proceeds as requested by the processor and optimized for the best possible material utilization. If, on the other hand, a critical value is displayed, ie a determined temperature difference of ⁇ 0.5 ° C compared to cooler neighboring areas, the simplest form of reaction would be to issue an alarm to the machine operator as an indication of a fault.
  • unwinding coated LWC paper with a weight per unit area of 75 g / m 2 there were temperature differences of up to 1.6 ° C at the beginning of the unwinding.
  • the temperature of the rollers is preferably measured on both end faces.
  • the invention provides a method for initiating a roll change of a web to be unwound from a sleeve, in particular a paper web in web printing presses, to achieve the object Combination of the following features is marked:
  • the second method according to the invention therefore enables the early detection of imperfections by means of temperature monitoring even when there is no frontal access to the roll, as is often the case in the unwinding station of web-fed printing presses Reasons.
  • the temperature measurement traversed across the entire width of the roll using an infrared camera equipped with a linear guide.
  • a computer evaluates the temperature profile across the entire width of the roll. If a predetermined temperature difference between the center and edge area of the roll is exceeded, a control signal is output to the changing device to trigger the changing process.
  • infrared cameras with a resolution accuracy of at least 0.2 ° C. have proven successful.
  • the ambient temperature at which the measurements take place is on average 30 ° C.
  • the methods according to the invention are not only applicable to the winding of webs of paper.
  • the core mass of the roll increases with increasing roll mass.
  • Figure 1 shows the end of a roll with a sketchy representation of an annular Temperature point and a point-like point with increased temperature
  • FIG. 2 shows a spatially arranged schematic representation of the first method according to the invention
  • FIG. 3 shows a schematic illustration of the second method according to the invention according to patent claim 3
  • FIG. 1 shows the end face of the completely wound roll (1) shortly before it is ejected from the rewinding of a paper machine (not shown).
  • the area of the sleeve (2) is hatched.
  • the dashed circle (4) corresponds to 60% of the finished diameter and indicates the start of temperature monitoring.
  • the paper layers face the annular temperature point (5) 1.3 ° C higher temperature than the directly adjacent paper layers.
  • the end face of the roller (1) also shows a local point-like temperature point (6) which, compared to the ring-shaped temperature point (5), again has a temperature which is 0.5 ° C higher.
  • the temperature gradation between the positions of the annular temperature point (5) and the local elevated temperature point (6) can be seen from FIGS. 4 and 5.
  • the perspective view of the roller (1) in Figure 2 shows the position of an annular temperature point (5) in the edge region (R) of the roller
  • the Meßeinric * ng the infrared camera are the coordinates of the location, ie the radial distance from the sleeve surface on exceeding a temperature set here difference of 1 ° C to the memory (10).
  • the changeover device (11) of the processing receives the previously stored coordinates of the location and triggers the advance role change when the location is reached. If the measuring device of the infrared camera detects smaller temperature differences, the changing process will only take place when the wound length of the web is fully utilized.
  • FIG. 3 An alternative embodiment of the invention is shown in FIG. 3.
  • the sheet-like temperature point (6 ') previously created at maximum roll mass has weakened only slightly in the course of the unwinding time due to the good insulating properties of paper and can also be detected in a larger area.
  • the traversing, constantly measuring infrared camera (8 ') records the temperature profile across the roll width.
  • An internal computer evaluates the temperature difference of the edges (R), which make up about 1/8 of the roll width, compared to the central area of the roll. If there is a set temperature difference, the computer transmits a control signal to the input of the changing device (11 '), which thus triggers the premature roll change.
  • too web breakers are successfully avoided by monitoring the temperature effects during
  • FIGS. 4 and 5 Infrared temperature recordings on rotating LWC base papers are shown in FIGS. 4 and 5.
  • the sleeve diameter (djj) and the zone (Z) are given in FIG. 5 for better orientation.
  • Figure 4 shows the detail of a flat temperature point (6) on an enlarged scale.
  • Figure 5 the gray gradation of the normally colored infrared image clearly shows the local temperature point (6) occurring within an annular temperature point (5) in the core area of the roll (1).
  • the temperature difference between the annular temperature point (5) and the local flat temperature point (6) is 0.5 ° C.
  • the adjacent paper layers (12) have a temperature of approx. 31.9 ° C.

Landscapes

  • Paper (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Windings For Motors And Generators (AREA)
  • Winding Of Webs (AREA)
  • Replacement Of Web Rolls (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)

Abstract

PCT No. PCT/EP95/01282 Sec. 371 Date Sep. 26, 1996 Sec. 102(e) Date Sep. 26, 1996 PCT Filed Apr. 7, 1995 PCT Pub. No. WO95/27676 PCT Pub. Date Oct. 19, 1995A process for initiating a premature roll change of a web to be unwound from a roll wound on a spool, the process including the steps of measuring temperature at an end of the roll in a zone up to 150 mm away from a surface of the spool in a radial direction during a time that the roll has between 100% and 60% of its fully wound weight, using a non-contact measuring device, determining a radial distance from the spool surface when a temperature difference>/=0.5 DEG C. is found between temperature measurement locations in the zone and cooler adjacent areas, and storing the determined distance for triggering a signal that initiates a replacement of the roll when that distance is reached.

Description

Verfahren zum Einleiten eines vorzeitigen Rollenwechsels Procedure for initiating an early role change
Die vorliegende Anmeldung betrifft ein Verfahren zum Einleiten eines vorzeitigen Rollenwechsels einer von einer Hülse abzuwickelnden Warenbahn, insbesondere einer Papierbahn.The present application relates to a method for initiating a premature roll change of a web to be unwound from a sleeve, in particular a paper web.
Der Begriff "Hülse" steht stellvertretend für Tamboure, Wickelkerne aus Pappe oder Metall.The term "sleeve" stands for drum, winding cores made of cardboard or metal.
Bei allen WickelVorgängen, insbesondere in der Papierindustrie, werden immer größere Rollen angestrebt. Dies gilt für den Durchmesser und die Breite. Die Wickeltechnik stößt jedoch auf physikalische Grenzen, die eine vollständige Nutzung der aufgewickelten Warenbahnmenge nicht zulassen. Im Innern der Rollen, d. h. im sogenannten Kernbereich, direkt an oder direkt über der Hülse treten Zerstörungen, wie Bahnzerreißungen, sogenannte Kernplatzer oder auch Kreppfalten auf. Im nachfolgenden werden diese Erscheinungen als Fehlstellen bezeichnet. Weiter erschwerend ist, daß diese Fehlstellen nur statistisch mit stark schwankenden Häufigkeiten auftreten.In all winding processes, especially in the paper industry, larger and larger roles are sought. This applies to the diameter and the width. However, the winding technology comes up against physical limits that do not allow full use of the wound web quantity. In the interior of the rolls, ie in the so-called core area, directly on or directly above the sleeve, destruction such as web tears, so-called core bursts or crepe folds occur. In the following, these phenomena are called defects. It is further aggravated that these defects only occur statistically with strongly fluctuating frequencies.
Zwangsläufig führt dies zu Abrissen der Warenbahn in den nachfolgenden Verarbeitungsmaschinen mit entsprechenden Stillständen und Materialverlusten. Aus Sicherheitsgründen wird daher die Rolle nicht vollständig weiterverarbeitet, sondern es wird eine beträchtliche Menge Restpapier auf der Hülse belassen, die dann als Ausschuß der Wiederverarbeitung zugeführt werden muß.This inevitably leads to the web being torn off in the subsequent processing machines with corresponding downtimes and material losses. For security reasons, therefore, the roll is not completely processed, but a considerable amount of residual paper is left on the sleeve, which then has to be reprocessed as rejects.
Wie Jühe in der DE- iteraturstelle: Praxiserfahrungen bei der Herstellung breiter Tiefdruckrollen mit großem Durchmesser, veröffentlicht in: Das Papier, 45. Jahrgang 1991, Heft 10a, Seiten V73 bis V78 berichtet, wurde bereits versucht, auftretende Fehler, wie z. B. Wickelfalten und Riegel während des Anwickelns mit stroboskopischer Beleuchtung für das menschliche Auge sichtbar zu machen. Trotzdem wird auch weiterhin eine beträchtliche Anzahl von Großrollen auf Klinikrollern zu Kontrollzwecken umgewickelt, um Anhaltspunkte für das evtl. Vorliegen von Fehlstellen zu erhalten, die bzw. deren Entstehung bisher von außen nicht festgestellt werden konnten. Aus der erwähnten Literaturstelle geht weiterhin hervor, daß "Problemstellen nahe der Hülse (Kernplatzstellen) " offensichtlich erst während der Abrollung entstehen, bei der Aufwicklung also noch gar nicht erfaßt werden können. Aus bei der Abrollung eines großen Tambours festgestellten Temperaturänderungen, d. h. einer systematischen Temperatursteigerung nahe des Tambourkerns - als Folge von Druckwechsel - und Biegebeanspruchungen sowie Gleitbewegungen im Kern - wird die Vorstellung abgeleitet, ein weiteres Prüfungs- und Beurteilungsverfahren für die Wicklungstechnik zu entwickeln. Als Merkmale für die Wicklungsqualität werden auf Seite V76, rechte Spalte u. a. die Rollenhärte, die Rollenstruktur, die Rollenoberfläche und die Rollenform angegeben. Eine Anregung zur Entwicklung einer Methode, die zur Feststellung evtl. vorliegender Fehlstellen dienen könnte, wird in der Literaturstelle noch nicht gegeben.As Jühe in the DE iteraturstelle: Practical experience in the production of wide rotogravure rolls with a large diameter, published in: The paper, 45th year 1991, number 10a, pages V73 to V78 reported, attempts have already been made to errors that occur, such as. B. make folds and bars visible during the winding with stroboscopic lighting for the human eye. Nevertheless, a considerable number of large rolls are still being wound on hospital scooters for control purposes in order to obtain clues for the possible presence of imperfections which, up to now, could not have been determined from the outside. From the above-mentioned literature it also appears that "problem areas near the core (core locations)" apparently only arise during unwinding, that is, they cannot yet be detected during winding. Off when unrolling a large one Tambour's detected temperature changes, ie a systematic temperature increase near the drum core - as a result of pressure changes - and bending stresses as well as sliding movements in the core - the idea is derived to develop a further test and assessment method for the winding technology. On page V76, right column, the characteristics of the winding quality include the hardness of the roll, the structure of the roll, the surface of the roll and the shape of the roll. No suggestion for the development of a method that could be used to identify any defects is given in the literature.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Verfügung zu stellen, das bei der Herstellung von Rollen mit großem Rollendurchmesser und großer Bahnbreite, insbesondere in der Papierindustrie, eine Möglichkeit zur frühzeitigen Ermittlung von im Kernbereich auftretenden Fehlstellen schafft, so daß die Herstellung von Großrollen bis zur Ausnutzung ihrer physikalischen Wickelgrenzen ermöglicht wird und die auf der Hülse notwendigerweise zu belassene Restlagenzahl minimiert wird.The present invention has for its object to provide a method that creates a possibility for the early detection of defects occurring in the core area in the manufacture of rolls with large roll diameter and large web width, especially in the paper industry, so that the production of Large rolls are made possible until their physical winding limits are used and the number of remaining layers that is necessarily left on the core is minimized.
Die Erfinder haben nun erkannt, daß innerhalb eines bestimmten, der Hülse benachbart liegenden Bereiches von Lagen der Papierbahn gewisse Temperaturphänomene auftreten können, die sich zur frühzeitigen Erkennung von Fehlstellen ausnutzen lassen und die Einleitung eines Rollenwechsels ermöglichen, bevor es durch die Fehlstellen zu einem Abriß der Warenbahn kommt. Bei den erwähnten Temperaturphänomenen handelt es sich um punkt- oder flächenförmige Stellen mit um wenige Zehntel °C erhöhter Temperatur. Diese Stellen sind nicht zu verwechseln mit ringförmigen Temperaturerscheinungen, die ebenfalls im Kernbereich zu beobachten sind und im Vergleich zu den weiter von der Hülse entfernt liegenden Lagen einer Warenbahn eine erhöhte Temperatur aufweisen.The inventors have now recognized that within a certain region of layers of the paper web lying adjacent to the sleeve, certain temperature phenomena can occur which result in Let early detection of defects take advantage of and enable the initiation of a roll change before the defects result in the web being torn off. The temperature phenomena mentioned are punctiform or sheet-like locations with a temperature which is increased by a few tenths of a degree Celsius. These points are not to be confused with ring-shaped temperature phenomena, which can also be observed in the core area and which have an elevated temperature in comparison to the layers of a material web which are further away from the sleeve.
Unter Rückgriff auf die neu gewonnenen Erkenntnisse schlägt die Erfindung daher zur Lösung der gestellten Aufgabe ein Verfahren zum Einleiten eines vorzeitigen Rollenwechsels einer von einer Hülse abzuwickelnden Warenbahn, insbesondere einer Papierbahn, vor, das durch die Kombination der nachfolgenden Merkmale gekennzeichnet ist:Using the newly gained knowledge, the invention therefore proposes a method for initiating a premature roll change of a web to be unwound from a sleeve, in particular a paper web, which is characterized by the combination of the following features:
- mit einer berührungslosen Temperaturmeßeinrichtung wird, während die Rolle beim Auf- oder AbwiekelVorgang 100 % bis 60 % ihrer Masse aufweist, stirnseitig in einer Zone, die bis zu 150 mm in radialer Richtung von der Oberfläche der Hülse entfernt ist, die Temperatur gemessen,the temperature is measured with a non-contact temperature measuring device, while the roll has 100% to 60% of its mass during the winding or unwinding process, in a zone which is up to 150 mm in the radial direction from the surface of the sleeve,
- bei einer festgestellten Temperaturdifferenz von ≥ 0,5 °C zwischen punkt- oder flächenförmigen Temperaturstellen innerhalb der Zone und den kühleren benachbarten Bereichen wird der radiale Abstand von der Hülsenoberfläche ermittelt, - der ermittelte Abstand wird zur Auslösung eines Signals, das den Rollenwechsel bei Erreichen des Abstandes auslöst, abgespeichert.- at a determined temperature difference of ≥ 0.5 ° C between point or surface temperature points within the zone and the cooler neighboring areas, the radial Distance from the sleeve surface determined - the determined distance is stored to trigger a signal that triggers the roll change when the distance is reached.
Wie Versuche an den Aufwicklungen zweier Papiermaschinen gezeigt haben, weist die an der Stirnseite der Papierrolle gemessene Temperaturentwicklung bei ca. 90 % der Messungen den folgenden typischen Verlauf auf, wobei es keinen gravierenden Unterschied zwischen einzelnen Flächengewichten - Rohpapiergewicht zwischen 32 bis 48 g/m2 - oder Papiersorten gab:As tests on the windings of two paper machines have shown, the temperature development measured on the face of the paper roll shows the following typical course in approx. 90% of the measurements, although there is no serious difference between individual grammages - raw paper weight between 32 and 48 g / m 2 - or types of paper:
Zunächst kommt das Papier mit einer hohen Temperatur aus der Trockenpartie der Papiermaschine. Im weiteren Verlauf der Aufwicklung sinkt die Temperatur im Kernbereich zunächst deutlich ab, je weiter sich der Tambour vom Nip entfernt. Wächst die Masse der Papierrolle über 60 % der Endmasse der fertigen Rolle an, klingt die Tendenz fallender Temperatur im Kernbereich deutlich ab. Der Trend fallender Temperaturen kehrte sich um, und die Temperatur stieg in einer Zone, die ca. 5 bis 150 mm, insbesondere 10 bis 80 mm, von der Oberfläche der Hülse entfernt ist, an. Dabei bildete sich innerhalb der Zone eine nur wenige mm breite ringförmige Temperaturstelle im Randbereich der Rolle. Festgestellte Temperaturdifferenzen von ≥ 0,5 °C an punkt- oder flächenförmigen Stellen innerhalb der schmalen ringförmigen Temperaturstelle - im Vergleich zu kühleren benachbarten Bereichen der ringförmigen Temperaturstelle - weisen auf Fehlstellen hin, die bei der nachgeschalteten Abwicklung zu Abrissen führen können.First, the paper comes out of the dryer section of the paper machine at a high temperature. In the further course of winding, the temperature in the core area initially drops significantly the further the drum moves away from the nip. If the mass of the paper roll grows above 60% of the final mass of the finished roll, the tendency of falling temperature in the core area subsides significantly. The trend of falling temperatures reversed and the temperature rose in a zone which is approximately 5 to 150 mm, in particular 10 to 80 mm, from the surface of the sleeve. A ring-shaped temperature point just a few mm wide formed in the edge region of the roll within the zone. Detected temperature differences of ≥ 0.5 ° C at point or area-shaped locations within the narrow, ring-shaped ones Temperature point - in comparison to cooler adjacent areas of the annular temperature point - indicate defects that can lead to tears in the subsequent processing.
Durch die Erkenntnis der Erfinder, wonach das Ausmaß der Temperaturerhöhung mit Fehlern im Kernbereich der Rolle gekoppelt ist, ermöglicht das erfindungsgemäße Verfahren erstmals mittels Temperaturüberwachung das Erkennen von Fehlstellen. Bei einer vorteilhaften Ausführungsform des ersten Verfahrens erfolgt die Überwachung beider Stirnseiten der Rolle, da das Auftreten von Fehlstellen willkürlich im Randbereich auf einer der beiden Seiten erfolgen kann und keineswegs auf beiden Seiten gleichzeitig vorkommen muß.Based on the inventors' knowledge that the extent of the temperature increase is coupled with errors in the core area of the roll, the method according to the invention enables the detection of defects for the first time by means of temperature monitoring. In an advantageous embodiment of the first method, both end faces of the roll are monitored, since defects can occur arbitrarily in the edge region on one of the two sides and in no way have to occur on both sides at the same time.
Da sich gezeigt hat, daß zu Beginn der Abwicklung, genau wie gegen Ende der Aufwicklung an der Papiermaschine, die Ausbildung von punkt- oder flächenförmigen Erwärmungen im hülsennahen Randbereich der Rolle erfolgt, spielt es prinzipiell keine Rolle, ob dieSince it has been shown that at the beginning of the processing, just like towards the end of the winding on the paper machine, the formation of punctiform or sheet-like heating takes place in the edge region of the roll near the sleeve, in principle it does not matter whether the
Temperaturüberwachung an der Auf- oder Abwicklung erfolgt.Temperature monitoring on the winding or unwinding takes place.
Wird keine Auffälligkeit registriert, verläuft der Verarbeitungsvorgang wie vom Verarbeiter gewünscht und zur bestmöglichen Materialausnutzung optimiert. Wird dagegen ein kritischer Wert angezeigt, d. h. eine ermittelte Temeraturdifferenz von ≥ 0,5 °C gegenüber kühleren benachbarten Bereichen, würde als einfachste Form des Reagierens, die Ausgabe eines Alarms für den Maschinenbetreiber als Hinweis auf eine Fehlstelle genügen.If no anomaly is registered, the processing process proceeds as requested by the processor and optimized for the best possible material utilization. If, on the other hand, a critical value is displayed, ie a determined temperature difference of ≥ 0.5 ° C compared to cooler neighboring areas, the simplest form of reaction would be to issue an alarm to the machine operator as an indication of a fault.
Die erfindungsgemäß vorgesehene Automatisierung zur Einleitung eines vorzeitigen Rollenwechsels, wobei Steuersignale der Temperaturmeßeinrichtung einen Rollenwechselvorgang auslösen, hat sich jedoch aus naheliegenden Gründen als überlegen erwiesen.The automation provided according to the invention for initiating a premature roll change, wherein control signals of the temperature measuring device trigger a roll change process, has, however, proven to be superior for obvious reasons.
Die Erfinder stellten fest, daß bei gestrichenen Papieren die Ausbildung von punkt- oder flächenförmigen Stellen mit erhöhter Temperatur stärker ausgeprägt ist als bei ungestrichenem Papier. Es ergaben sich bei der Abrollung von gestrichenem LWC-Papier mit einem Flächengewicht von 75 g/m2 zu Beginn der Abwicklung Temperaturdifferenzen bis zu 1,6 °C. Vorzugsweise wird die Temperatur der Rollen an beiden Stirnseiten gemessen.The inventors found that with coated papers the formation of punctiform or sheet-like places with increased temperature is more pronounced than with uncoated paper. When unwinding coated LWC paper with a weight per unit area of 75 g / m 2, there were temperature differences of up to 1.6 ° C at the beginning of the unwinding. The temperature of the rollers is preferably measured on both end faces.
Gemäß einem zweiten Vorschlag, wie er im Patentanspruch 3 angegeben ist, sieht die Erfindung zur Lösung der gestellten Aufgabe ein Verfahren zum Einleiten eines Rollenwechsels einer von einer Hülse abzuwickelnden Warenbahn, insbesondere einer Papierbahn in Rollendruckmaschinen vor, das durch die Kombination der nachfolgenden Merkmale gekennzeichnet ist:According to a second proposal, as specified in claim 3, the invention provides a method for initiating a roll change of a web to be unwound from a sleeve, in particular a paper web in web printing presses, to achieve the object Combination of the following features is marked:
- während die Rolle im Bereich von 100 mm von der Hülsenoberfläche entfernt bis zum Ende abgewickelt wird, wird oberhalb der abzuwickelnden Warenbahn eine berührungslose Temperaturmessung im Randbereich sowie im Mittenbereich der Rolle durchgeführt,- While the roll is unwound to the end in the area of 100 mm from the sleeve surface, a contactless temperature measurement is carried out above the web to be unwound in the edge area and in the middle area of the roll,
- durch Ermittlung einer Temperaturdifferenz im Randbereich der Rolle im Vergleich zum Mittenbereich von > 0,5 °C wird durch von der Temperaturmeßeinrichtung ausgelöste Steuersignale ein vorgezogener Rollenwechsel eingeleitet.- By determining a temperature difference in the edge area of the roll in comparison to the central area of> 0.5 ° C, an early roll change is initiated by control signals triggered by the temperature measuring device.
Obwohl die höhere Wärmeentwicklung im Kernbereich der Rolle bei großer Rollenmasse am Anfang des Abwickelprozesses entsteht, lassen sich lokal erwärmte Stellen, die auf Fehlstellen hinweisen, auch noch bei fortgeschrittenem Abwickelprozeß meßtechnisch erfassen. Dies gelingt, weil lokal erwärmte Stellen sich während der Abwicklung infolge eines Wärmeflusses gegenüber der Umgebung in einem größeren Bereich nachweisen lassen. Entscheidend ist dann die Temperaturdifferenz zwischen Rollenmitte und den Randbereichen. Das erfindungsgemäße zweite Verfahren ermöglicht demnach mittels Temperaturüberwachung das frühzeitige Erkennen von Fehlstellen auch dann, wenn kein stirnseitiger Zugang zur Rolle möglich ist, wie es bei der AbwickelStation von Rollendruckmaschinen häufig aus konstruktiven Gründen vorgegeben ist.Although the higher heat development in the core area of the roll occurs with a large roll mass at the beginning of the unwinding process, locally heated points that indicate defects can also be measured using advanced measurement processes. This is possible because locally heated areas can be detected in a larger area due to a heat flow to the environment. The decisive factor is the temperature difference between the center of the roll and the edge areas. The second method according to the invention therefore enables the early detection of imperfections by means of temperature monitoring even when there is no frontal access to the roll, as is often the case in the unwinding station of web-fed printing presses Reasons.
Bei dem erfindungsgemäßen zweiten Verfahren hatte sich als besonders vorteilhaft erwiesen, die Temperaturmessung durch eine Infrarotkamera, die mit einer Linearführung ausgestattet ist, traversierend über die gesamte Breite der Rolle erfolgen zu lassen. Ein Rechner wertet das Temperaturprofil über die ganze Breite der Rolle aus. Bei Überschreiten einer vorgegebenen Temperaturdifferenz zwischen Mitten- und Randbereich der Rolle wird ein Steuersignal an die Wechselvorrichtung zum Auslösen des Wechselvorgangs ausgegeben.In the second method according to the invention, it had proven to be particularly advantageous to have the temperature measurement traversed across the entire width of the roll using an infrared camera equipped with a linear guide. A computer evaluates the temperature profile across the entire width of the roll. If a predetermined temperature difference between the center and edge area of the roll is exceeded, a control signal is output to the changing device to trigger the changing process.
Erfindungsgemäß haben sich Infrarotkameras mit einer Auflösegenauigkeit von wenigstens 0,2 °C bewährt. Die Umgebungstemperatur, bei der die Messungen stattfinden, beträgt im Mittel 30 °C.According to the invention, infrared cameras with a resolution accuracy of at least 0.2 ° C. have proven successful. The ambient temperature at which the measurements take place is on average 30 ° C.
Die erfindungsgemäßen Verfahren sind nicht nur auf das Wickeln von Warenbahnen aus Papier anwendbar. Auch beim Wickeln von Warenbahnen aus Kunststoffasern oder bei Folien entstehen mit wachsender Rollenmasse Erwärmungen im Kernbereich der Rolle.The methods according to the invention are not only applicable to the winding of webs of paper. When winding webs of plastic fibers or foils, the core mass of the roll increases with increasing roll mass.
Die nachfolgenden Figuren dienen der näheren Erklärung der Erfindung. Es zeigen:The following figures serve to explain the invention in more detail. Show it:
Figur 1 die Stirnseite einer Rolle mit skizzenhafter Darstellung einer ringförmigen Temperaturstelle und einer punktförmigen Stelle mit erhöhter Temperatur,Figure 1 shows the end of a roll with a sketchy representation of an annular Temperature point and a point-like point with increased temperature,
Figur 2 eine räumlich angeordnete schematische Darstellung des ersten erfindungsgemäßen Verfahrens gemäß Patentanspruch 1,FIG. 2 shows a spatially arranged schematic representation of the first method according to the invention,
Figur 3 eine schematische Darstellung des zweiten erfindungsgemäßen Verfahrens nach Patentanspruch 3,FIG. 3 shows a schematic illustration of the second method according to the invention according to patent claim 3,
Figurencharacters
4 und 5 Infrarot-Temperaturaufnahmen mit lokaler Temperaturerhöhung, aufgenommen von der Stirnseite der Rolle.4 and 5 infrared temperature recordings with local temperature increase, taken from the front of the roll.
Figur 1 zeigt die Stirnseite der fertig gewickelten Rolle (1) kurz vor dem Ausstoßen aus der nicht gezeichneten Aufwicklung einer Papiermaschine. Die Rolle (1) weist einen Fertigdurchmesser von dmax = 3,2 m und einen Innendurchmesser bzw. Hülsendurchmesser von djj = 560 mm auf. Der Bereich der Hülse (2) ist schraffiert gezeichnet. Eine wenige mm breite, als dicke Strichpunktlinie dargestellte ringförmige Temperaturstelle (5) befindet sich innerhalb der in radialer Richtung mit Z = 150 mm gezeichneten Zone. Der gestrichelt gezeichnete Kreis (4) entspricht 60 % des Fertigdurchmessers und gibt den zeitlichen Beginn der Temperaturüberwachung an. Mit Erreichen des Fertigdurchmessers weisen die Papierlagen der ringförmigen Temperaturstelle (5) eine um 1,3 °C höhere Temperatur als die direkt benachbarten Papierlagen auf. Die Stirnseite der Rolle (1) zeigt zudem eine lokale punktförmige Temperaturstelle (6) , die gegenüber der ringförmigen Temperaturstelle (5) nochmals eine um 0,5 °C höhere Temperatur aufweist. Die Temperaturabstufung zwischen den Lagen der ringförmigen Temperaturstelle (5) und der lokalen erhöhten Temperaturstelle (6) sind aus Figuren 4 und 5 zu entnehmen.FIG. 1 shows the end face of the completely wound roll (1) shortly before it is ejected from the rewinding of a paper machine (not shown). The roller (1) has a finished diameter of d max = 3.2 m and an inner diameter or sleeve diameter of djj = 560 mm. The area of the sleeve (2) is hatched. A ring-shaped temperature point (5) a few mm wide and shown as a thick chain line is located within the zone marked Z = 150 mm in the radial direction. The dashed circle (4) corresponds to 60% of the finished diameter and indicates the start of temperature monitoring. When the finished diameter is reached, the paper layers face the annular temperature point (5) 1.3 ° C higher temperature than the directly adjacent paper layers. The end face of the roller (1) also shows a local point-like temperature point (6) which, compared to the ring-shaped temperature point (5), again has a temperature which is 0.5 ° C higher. The temperature gradation between the positions of the annular temperature point (5) and the local elevated temperature point (6) can be seen from FIGS. 4 and 5.
Die perspektivische Darstellung der Rolle (1) in Figur 2 zeigt die Lage einer ringförmigen Temperaturstelle (5) im Randbereich (R) der RolleThe perspective view of the roller (1) in Figure 2 shows the position of an annular temperature point (5) in the edge region (R) of the roller
(1) . Dieser Randbereich (R) , an dem erhöhte flächen- oder punktförmige Temperaturstellen beobachtet werden, wird durch einen Hohlzylinder beschrieben, bei dem der Innendurchmesser = Außendurchmesser der Hülse (2) einer Wandstärke der Zone Z = 150 mm entspricht und der eine Höhe(1) . This edge area (R), at which elevated surface or punctiform temperature points are observed, is described by a hollow cylinder in which the inside diameter = outside diameter of the sleeve (2) corresponds to a wall thickness of the zone Z = 150 mm and the height
(7) von 1/8 der Rollenbreite (AB) aufweist. Der Hohlzylinder ist mit dünn ausgezogenen Linien gezeichnet, wogegen die ringförmige Temperaturstelle (5) wieder durch eine dicke strichpunktierte Linie dargestellt ist.(7) of 1/8 of the roll width (AB). The hollow cylinder is drawn with thin solid lines, whereas the annular temperature point (5) is again represented by a thick dash-dotted line.
Die Infrarotkamera (8) ist in einem Abstand A = 1,5 m, gemessen von der St ..rnseite der Rolle, angeordnet. Die Meßeinric * ng der Infrarotkamera gibt die Koordinaten des Ortes, d. h. den radialen Abstand von der Hülsenoberfläche bei Überschreiten einer hier eingestellten Temperaturdifferenz von 1 °C an den Speicher (10) weiter. Die Wechseleinrichtung (11) der Abwicklung erhält die zuvor gespeicherten Koordinaten des Ortes und löst bei Erreichen des Ortes den vorgezogenen Rollenwechsel aus. Ermittelt die Meßeinrichtung der Infrarotkamera kleinere Temperaturdifferenzen, wird der Wechselvorgang erst bei vollständiger Ausnutzung der gewickelten Warenbahnlänge erfolgen.The infrared camera (8) is arranged at a distance A = 1.5 m, measured from the front side of the roll. The Meßeinric * ng the infrared camera are the coordinates of the location, ie the radial distance from the sleeve surface on exceeding a temperature set here difference of 1 ° C to the memory (10). The changeover device (11) of the processing receives the previously stored coordinates of the location and triggers the advance role change when the location is reached. If the measuring device of the infrared camera detects smaller temperature differences, the changing process will only take place when the wound length of the web is fully utilized.
Eine alternative Ausführungsform der Erfindung zeigt Figur 3. Die Großrolle (1') aus LWC-Papier mit den Dimensionen AB = 3,2 m Breite, dem Außendurchmesser dmax = 1.250 mm und dem Hülsendurchmesser djj = 150 mm, ist bereits bis auf Z' = 100 mm Restdicke abgewickelt. Die zuvor bei maximaler Rollenmasse entstandene flächenförmige Temperaturstelle (6') hat sich aufgrund der guten Isoliereigenschaften von Papier im Laufe der Abwickelzeit gegenüber der Umgebung nur gering abgeschwächt und läßt sich zudem in einem größeren Bereich nachweisen. Die traversierend, ständig messende Infrarotkamera (8') nimmt über die Rollenbreite das Temperaturprofil auf. Ein intern arbeitender Rechner wertet die Temperaturdifferenz der Ränder (R) , die ca. 1/8 der Rollenbreite ausmachen, gegenüber dem Mittenbereich der Rolle aus. Bei Vorliegen einer eingestellten Temperaturdifferenz gibt der Rechner ein Steuersignal auf den Eingang der Wechselvorrichtung (11') weiter, die damit den vorzeitigen Rollenwechsel auslöst. Auch hier werden erfolgreich Bahnreißer durch Überwachung der Temperatureffekte beim Abwickeln vermieden.An alternative embodiment of the invention is shown in FIG. 3. The large roll (1 ') made of LWC paper with the dimensions AB = 3.2 m width, the outer diameter d max = 1,250 mm and the sleeve diameter d j j = 150 mm is already up to to Z '= 100 mm residual thickness. The sheet-like temperature point (6 ') previously created at maximum roll mass has weakened only slightly in the course of the unwinding time due to the good insulating properties of paper and can also be detected in a larger area. The traversing, constantly measuring infrared camera (8 ') records the temperature profile across the roll width. An internal computer evaluates the temperature difference of the edges (R), which make up about 1/8 of the roll width, compared to the central area of the roll. If there is a set temperature difference, the computer transmits a control signal to the input of the changing device (11 '), which thus triggers the premature roll change. Here too web breakers are successfully avoided by monitoring the temperature effects during unwinding.
Infrarot-Temperaturaufnahmen an rotierenden LWC- Rohpapieren sind in Figuren 4 und 5 dargestellt. Zur besseren Orientierung sind in Figur 5 der Hülsendurchmesser (djj) und die Zone (Z) angegeben. Figur 4 zeigt den Ausschnitt einer flächenförmigen Temperaturstelle (6) im vergrößerten Maßstab. Die Grauabstufung der normalerweise farbigen Infrarotaufnahme zeigt bei Figur 5 deutlich im Kernbereich der Rolle (1) die lokale, innerhalb einer ringförmigen Temperaturstelle (5) auftretende Temperaturstelle (6) . Die Temperaturdifferenz zwischen ringförmiger Temperaturstelle (5) und lokaler flächenförmiger Temperaturstelle (6) beträgt 0,5 °C. Die benachbarten Papierlagen (12) weisen eine Temeratur von ca. 31,9 °C auf. Infrared temperature recordings on rotating LWC base papers are shown in FIGS. 4 and 5. The sleeve diameter (djj) and the zone (Z) are given in FIG. 5 for better orientation. Figure 4 shows the detail of a flat temperature point (6) on an enlarged scale. In Figure 5, the gray gradation of the normally colored infrared image clearly shows the local temperature point (6) occurring within an annular temperature point (5) in the core area of the roll (1). The temperature difference between the annular temperature point (5) and the local flat temperature point (6) is 0.5 ° C. The adjacent paper layers (12) have a temperature of approx. 31.9 ° C.

Claims

Patentansprüche claims
Verfahren zum Einleiten eines vorzeitigen Rollenwechsels einer von einer Hülse abzuwickelnden Warenbahn, insbesondere einer Papierbahn, gekennzeichnet durch die Kombination der nachfolgenden Merkmale:Method for initiating a premature roll change of a web to be unwound from a sleeve, in particular a paper web, characterized by the combination of the following features:
- mit einer berührungslosen Temperaturmeßeinrichtung wird, während die Rolle beim Auf- oder Abwickelvorgang 100 % bis 60 % ihrer Masse aufweist, stirnseitig in einer Zone, die bis zu 150 mm in radialer Richtung von der Oberfläche der Hülse entfernt ist, die Temperatur gemessen,the temperature is measured with a non-contact temperature measuring device, while the roll has 100% to 60% of its mass during the winding or unwinding process, in a zone which is up to 150 mm in the radial direction from the surface of the sleeve,
- bei einer festgestellten Temperaturdifferenz von ≥ 0,5 °C zwischen punkt- oder flächenförmigen Temperaturstellen innerhalb der Zone und den kühleren benachbarten Bereichen wird der radiale Abstand von der Hülsenoberfläche ermittelt,- at a determined temperature difference of ≥ 0.5 ° C between point or surface temperature points within the zone and the cooler neighboring areas, the radial distance from the sleeve surface is determined,
- der ermittelte Abstand wird zur Auslösung eines Signals, das den Rollenwechsel bei Erreichen des Abstandes auslöst, abgespeichert. - The determined distance is saved to trigger a signal that triggers the role change when the distance is reached.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, . daß die Temperaturmessung von beiden Stirnseiten der Rolle erfolgt.2. The method according to claim 1, characterized in that. that the temperature is measured from both ends of the roll.
3. Verfahren zum Einleiten eines Rollenwechsels einer von einer Hülse abzuwickelnden Warenbahn, insbesondere einer Papierbahn in Rollendruckmaschinen, gekennzeichnet durch die Kombination der nachfolgenden Merkmale:3. Method for initiating a roll change of a web to be unwound from a sleeve, in particular a paper web in web printing machines, characterized by the combination of the following features:
- während die Rolle im Bereich von 100 mm von der Hülsenoberfläche entfernt bis zum Ende abgewickelt wird, wird oberhalb der abzuwickelnden Warenbahn eine berührungslose Temperaturmessung im Randbereich sowie im Mittenbereich der Rolle durchgeführt,- While the roll is unwound to the end in the area of 100 mm from the sleeve surface, a contactless temperature measurement is carried out above the web to be unwound in the edge area and in the middle area of the roll,
- durch Ermittlung einer Temperaturdifferenz im Randbereich der Rolle im Vergleich zum Mittenbereich von > 0,5 °C wird durch von der Temperaturmeßeinrichtung ausgelöste Steuersignale ein vorgezogener Rollenwechsel eingeleitet.- By determining a temperature difference in the edge area of the roll in comparison to the central area of> 0.5 ° C, an early roll change is initiated by control signals triggered by the temperature measuring device.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß die Temperaturmessung durch eine Infrarotkamera, die mit einer Linearführung ausgestattet ist, traversierend über die gesamte Breite der Rolle erfolgt.4. The method according to claim 3, characterized in that the temperature measurement by an infrared camera, which is equipped with a linear guide, traversing over the entire width of the roll.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß als5. The method according to any one of claims 1 to 4, characterized in that as
Temperaturmeßeinrichtung eine Infrarotkamera mit einer Auflösegenauigkeit von wenigstens 0,2 °C eingesetzt wird. Temperature measuring device an infrared camera with a resolution accuracy of at least 0.2 ° C. is used.
EP95915861A 1994-04-08 1995-04-07 Method of initiating the premature replacement of a roll of material Expired - Lifetime EP0754159B1 (en)

Applications Claiming Priority (5)

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DE4412075 1994-04-08
DE4412075 1994-04-08
DE4442154A DE4442154A1 (en) 1994-04-08 1994-11-26 Procedure for initiating an early role change
DE4442154 1994-11-26
PCT/EP1995/001282 WO1995027676A1 (en) 1994-04-08 1995-04-07 Method of initiating the premature replacement of a roll of material

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EP0754159B1 EP0754159B1 (en) 1998-08-19

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CN110100149B (en) * 2016-12-27 2021-08-24 索尼公司 Survey mark, image processing apparatus, image processing method, and program

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WO1995027676A1 (en) 1995-10-19
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NO964170L (en) 1996-10-02
DK0754159T3 (en) 1998-11-16
US5769353A (en) 1998-06-23
ATE169885T1 (en) 1998-09-15
FI963941A (en) 1996-10-02
ES2119427T3 (en) 1998-10-01
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NO306337B1 (en) 1999-10-25
CA2187179A1 (en) 1995-10-19

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