EP0732198B1 - Verfahren und Vorrichtung zum Regeln der Feuchtigkeit einer Materialbahn in einer Druckmaschine - Google Patents

Verfahren und Vorrichtung zum Regeln der Feuchtigkeit einer Materialbahn in einer Druckmaschine Download PDF

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Publication number
EP0732198B1
EP0732198B1 EP96103259A EP96103259A EP0732198B1 EP 0732198 B1 EP0732198 B1 EP 0732198B1 EP 96103259 A EP96103259 A EP 96103259A EP 96103259 A EP96103259 A EP 96103259A EP 0732198 B1 EP0732198 B1 EP 0732198B1
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European Patent Office
Prior art keywords
correction
station
humidity
dryer
width
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Expired - Lifetime
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EP96103259A
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English (en)
French (fr)
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EP0732198A2 (de
EP0732198A3 (de
Inventor
Roger Henri Roch
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Bobst Mex SA
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Bobst SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/02—Conveying or guiding webs through presses or machines
    • B41F13/025—Registering devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/02—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by dampening

Definitions

  • the present invention relates to a method and associated device for controlling the humidity of a strip of material, such as paper or cardboard, within a color printing machine including several stations each printing in one of the fundamental colors coming superimpose on the previous ones.
  • Such a printing machine includes normally a registry check device longitudinal and / or lateral of the prints.
  • This device is usually based on detection by one or more photocells, or others detectors, position of printed marks side by side and / or one behind the other in the margin by each station.
  • a computer receiving the detector signals continuously determines the longitudinal and lateral tracking errors and applies correction signals to move the compensating roller and the printing cylinders to correct the location.
  • the humidity of the outgoing band of a station is dependent a lot of factors such as the quality of the paper, the quality of the ink, the magnitude of prints, paper moisture before printing, humidity and air temperature in the dryer, the drying length and the running speed of the tape in the machine.
  • factors such as the quality of the paper, the quality of the ink, the magnitude of prints, paper moisture before printing, humidity and air temperature in the dryer, the drying length and the running speed of the tape in the machine.
  • 1% variation in the humidity of a strip of paper varies its transverse dimension by 0.1%, i.e. 3 millimeters for a strip 3 meters wide.
  • One of the tasks of the machine operator then consists, after checking the voucher operation of the register control system in the center of the image, also check the timing impressions in the edges. If it detects a residual lateral error, it must then intervene manually on the driers to best adjust band humidity from station to station. This manual work is however tedious and cannot be performed only by qualified persons.
  • Document US 4,798,136 describes a process and automatic register check device prints excluding print marks in border and based on reading the physical width of the band at the entrance of each station. This bandwidth is measured by two sensors lateral each comprising a rod carrying in a first end a caster in contact with the edge of the strip, the other end carrying a magnet moving in front of two windings electromagnetic reading.
  • the calculator detects a variation in the bandwidth of a station to another, it only corrects the efficiency from the previous dryer, either by acting on the temperature of the drying roller in contact with the strip and heated by an electrical resistance or by hot water or steam, either by modifying air flow or electric air heating breathed in.
  • the object of the present invention is to obviate the aforementioned drawbacks by proposing a method, and associated device for controlling the humidity of a strip of material within a printing machine in color, which is more efficient in terms of setting accuracy of the prints above others and more dynamic in its time feedback.
  • this process should be able to base it on the expected result, namely the regularity of the width of successive prints.
  • the design of the implementation device of the process must remain simple for an implementation to reasonable cost and easy maintenance.
  • the correction signals apply to the amount of steam injected into the drying air blown into the dryers.
  • This quantity of vapor injected allows in particular to impose on a predetermined value the humidity of this drying air.
  • the function giving the moisture of the paper being dried is a declining curve over time towards a asymptote, of the logarithmic function type whose base is between zero and one, or of the function type of power with negative exponent, whose value of the lower asymptote is the humidity value of blown air. So, by modulating the value of humidity, it changes very quickly and very effectively the paper drying curve, so humidity at the exit of the strip after a given time depending on the length of the dryer and the speed scroll.
  • the first secondary correction should preferably be between 7 and 50, and the second correction secondary must be between 1 and 15.
  • the widths of the prints successive are measured at the output of the machine printing in order to be able to examine the evolution of errors from one station to another, and determine the direction secondary corrections based on this evolution.
  • This device includes first means already used to adjust the side damper and longitudinal. So, by supplementing the algorithms and digital computer databases electronic, it can advantageously be connected simply to solenoid valves or cards electric fan motor control, to electrical resistance supply boards commercially available heating. The cost of realization of the device according to the invention can therefore to be in control.
  • the electrical signals of correction are applied on the control valves water vapor injected into the drying air blown into the dryers. If a valve arrives in opening or closing stop, then the signal corresponding is applied on air heating breathed in.
  • FIG. 1 In the upper part of Figure 1 is schematically represented a printing machine of color images on a strip of material 2 such than a strip of paper or cardboard.
  • This machine printing for example of the rotogravure type, includes four printing groups: the first group I1 printing in yellow, the second group I2 printing in red, the third group I3 printing in blue and the last group I4 printing in black for give contrast to the final image.
  • the colors would be printed in reverse, from darkest to lightest. In this machine, it is necessary to dry completely the impression of a color before to apply the next one, in order to avoid any mixture or burr.
  • the ink applied by a printing group I can temporarily moisten the strip of paper which then tends to widen and that should be brought back to its original size before successive printing. So in the example shown, the paper strip 2 enters the machine with a initial humidity hp0 and comes out of the dryer S1 of the first station with a hp1 humidity before being printed by the printing group I2, and so continued, the band leaving the following stations with humidity respectively hp2 and hp3.
  • double photoelectric means comprising a mark detection device 10 located above the right margin of the strip and a another 20 located above the left margin.
  • Each detection device first comprises a light source projecting a light spot in the corresponding margin of the strip.
  • Each device then includes cells photoelectric receiving directly, or by through optical fibers, light thought which is altered by the passage of a mark.
  • these photoelectric means can be two CCD cameras taking a "photo" of a group of marks during a light flash synchronized with scrolling the tape.
  • the signals generated by these means photoelectric detection 10 and 20 are applied to electronic means 30, such as a card image processing processor, which determine first the width effective of each impression by comparing the two corresponding right and left marks. Then in secondly, these electronic means establish the possible difference from one impression to another as well as their evolution along the printing machine. Digital data representative of these differences in widths successive are applied to a computer 40 which, based on algorithms and parameter tables prerecorded, establishes correction signals for each of the driers S1, S2 and S3, according to a process described in more detail later.
  • electronic means 30 such as a card image processing processor, which determine first the width effective of each impression by comparing the two corresponding right and left marks. Then in secondly, these electronic means establish the possible difference from one impression to another as well as their evolution along the printing machine. Digital data representative of these differences in widths successive are applied to a computer 40 which, based on algorithms and parameter tables prerecorded, establishes correction signals for each of the driers S1, S2 and S3,
  • the signals of correction from the computer 40 are first applied to solenoid valves 52, 52 ', 52' 'from control of the water vapor from a tank 60 and injected into the air blown into each of dryers: respectively dryer S1, dryer S2 and dryer S3. So, we set at a specific value the humidity of the air blown on the strip: HS1 in the dryer S1, HS2 in the dryer S2 and HS3 in the dryer S3.
  • Figure 5 illustrates the ideal situation where the strip of paper entering the printing machine with an initial humidity hp0 is systematically dried back to the same hp0 value before printing next. Then the impressions IMP1, IMP2, IMP3 appearing along the abscissa appear at exit with a strictly identical width.
  • impressions IMP1 and IMP2 are equal magnitude resulting in an identical increase of the humidity of the strip, therefore requiring an action of also identical drying. Otherwise, it simply adjust the amount of drying in depending on the size of the print.
  • the effect of drying on paper moisture is represented by a curve asymptotic taper, of the inverted logarithm type or of the power function type with negative exponent, and whose value of the asymptote corresponds to that of HS humidity of the blown air.
  • this drying curve depends on many factors which one cite among others the length of the dryer, the profile variation along the dryer either flow or the supply air temperature, and possibly the presence of heating elements in contact with the bandaged.
  • the ideal result of dryers S1 and S2 is to bring back systematically the humidity of the strip at its value initial hp0.
  • Figure 3 illustrates a first situation of imbalance in which the impression IMP1 emerges narrower than IMP2 and IMP3 prints strictly the same width. This comes from the fact, as illustrated by the strong line curve, that the value of the humidity hp1 of the strip leaving the dryer S1 is substantially identical to humidity hp2 of the strip leaving the dryer S2, these two humidity, on the other hand, being significantly lower than the initial humidity hp0 entering the machine. So, after being correctly printed, IMP1 printing is contracted by an excess drying both upon arrival in the group I2 and in the I3 printing group.
  • This has the effect of immediately modify the drying effect according to a curve illustrated in long dashed lines at the point of reduce the humidity hp1 of the strip at the outlet of the dryer S1 substantially equal to the input humidity hp0.
  • this first correction + Qv of the vapor injected into the air of the dryer S1 is accompanied simultaneously by a secondary correction + qv of the steam injected into the air blown into the dryer S2 so as to bring its humidity from the initial value HS2 to one second HS2c value.
  • the humidity hp1 of the paper leaving the dryer S1 increased, the effect of drying without correction in dryer S2 would also have increased, to follow the curve illustrated in thin line short, bringing the humidity of the paper out of the dryer S2 practically at the same initial value then inducing a width imbalance between the impressions IMP1 and IMP2 on the one hand and the impression IMP3 on the other hand.
  • the correction secondary + qv has the effect of simultaneously increasing the humidity of the hp2 paper at the outlet of the dryer S2 causing only one correction to remain low residual to be carried out during a second iteration to return to the ideal example according to the figure 5.
  • an anticipation + qv of a secondary correction during a correction primary + Qv significantly accelerated the process of return to the desired situation.
  • Figure 4 illustrates a situation of inverse imbalance in which the first print appears too wide compared to output to impressions IMP2 and IMP3 assumed here too identical. As illustrated by the line curve full, this is due to the fact that the humidity hp1 of the strip at the outlet of the dryer S1 is substantially equal to the humidity hp2 at the outlet of the dryer S2, both being too high compared to an initial humidity from the hp0 band.
  • a primary correction -Qv in the form of a decrease in the amount of steam injected into the air blown into the dryer S1 reduces the humidity of this air with a value HS1 to HS1c corrected to bring back the humidity value hp1 at the outlet of the dryer S1 substantially equal to the initial value hp0.
  • this decrease in humidity at the outlet of the dryer S1 results in a decrease of the efficiency of the dryer S2 so that the curve in a short fine line, the humidity hp2 remains substantially at its original value.
  • the correction secondary + qv performed in the same direction as the primary correction + Qv proves useful when the IMP2 and IMP3 impressions are identical or that IMP2 is also less than IMP3.
  • the computer 40 reverses the direction of the secondary correction in -qv.
  • the secondary correction qv carried out in the same subtractive direction of the primary correction Qv is useful when the IMP2 and IMP3 impressions are identical or that the IMP3 impression is less than IMP2 printing.
  • the means photoelectric 10, 20 and electronic 30 detect that the IMP3 impression is too high compared to printing IMP2, then the computer 40 applies a secondary correction qv in the opposite direction.
  • the computer 40 can thus contain a algorithm processing each of the configurations possible changes in the printing width of four colors along the printing machine and, for each configuration, apply in one direction or in the other the secondary corrections on downstream dryers following a primary correction of a upstream dryer, these secondary corrections being decreasing.
  • the magnitude of the secondary corrections depends greatly from the geometry of the dryers. For a primary correction of 100 units, provision is made for secondary correction of the order of 8 to 50 units in the dryer immediately following and in the range of 1 to 15 units in the subsequent dryer.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Drying Of Solid Materials (AREA)
  • Rotary Presses (AREA)
  • Coating Apparatus (AREA)
  • Printing Plates And Materials Therefor (AREA)

Claims (7)

  1. Verfahren zum Regeln der Feuchtigkeit einer Materialbahn (2) in einer Farbdruckmaschine, dadurch gekennzeichnet, dass es besteht aus :
    Messen der Druckbreite von einer Station (I1), und der Breite des von der nächsten Station (I2) ausgeführten Druckes,
    Ermitteln der möglichen Differenz in der Breite von einem Druck zum anderen, und
    falls eine Differenz nicht gleich Null ist, Erzeugen eines primären Korrektursignals (Qv), angelegt an einen oder mehrere Parameter des Trockners (S1) der Station (I1), um die Differenz auf Null zu bringen, und Erzeugen von sekundären Signalen (qv) zur degressiven Korrektur des oder der gleichen Parameter, angelegt an jeweils jeden der Trockner (S2, S3) der folgenden Stationen (I2, I3) der Druckmaschine.
  2. Verfahren gemäss Patentanspruch 1, dadurch gekennzeichnet, dass die Korrektursignale (Qv, qv) an die Menge des in die eingeblasene Trockenluft der Trockner eingespritzten Dampfes angelegt werden.
  3. Verfahren gemäss Patentanspruch 2, dadurch gekennzeichnet, dass, für eine primäre Korrektur (Qv) von 100, die erste sekundäre Korrektur (qv) zwischen 7 und 50, und die zweite sekundäre Korrektur zwischen 1 und 15 liegt.
  4. Verfahren gemäss einem der Patentansprüche 1 bis 3, dadurch gekennzeichnet, dass die Breiten der aufeinanderfolgenden Drucke beim Ausgang der Druckmaschine gemessen werden, um die Passerfehlerentwicklung von einer Station zur anderen untersuchen, und die Richtung der sekundären Korrekturen in Abhängigkeit von dieser Entwicklung bestimmen zu können.
  5. Vorrichtung für die Durchführung des Verfahrens gemäss einem der vorerwähnten Patentansprüche, dadurch gekennzeichnet, dass sie umfasst :
    lichtelektrische Mittel (10, 20), welche die Stellung einer Passermarke rechts und einer Passermarke links erfassen, um die Druckbreite von einer Station (I1) zu bestimmen, und welche die Stellung der Passermarken rechts und links erfassen, um die Breite der von der nächsten Station (I2) ausgeführten Drucke zu bestimmen,
    elektronische Mittel (30), welche die Signale der lichtelektrischen Mittel (10, 20) empfangen und die mögliche Differenz in der Breite von einem Druck zum anderen ermitteln,
    ein mit den elektronischen Mitteln (30) verbundener elektronischer Rechner (40), der, falls eine Differenz nicht gleich Null ist, ein primäres elektrisches Korrektursignal (Qv) erzeugt, angelegt an die Regelungsmittel (52, 54) der Heizung einer Platte oder einer Rolle in Kontakt mit der Bahn, oder des Stroms, der Heizung und/oder des Wasserdampfgehaltes des Trockners der Station, um den Feuchtigkeitsgehalt der Bahn auf seinen Ausgangswert beim Eintritt in die Maschine zu bringen, und welcher Rechner (40) sekundäre elektrische Signale (qv) zur degressiven Korrektur erzeugt, angelegt an die gleichen Regelungsmittel (52', 54', 52'', 54'') von jeweils jedem nächsten Trockner der Druckmaschine.
  6. Vorrichtung gemäss Patentanspruch 5, dadurch gekennzeichnet, dass die elektrischen Korrektursignale (Qv, qv) an die Ventile (52, 52') zur Regelung des in die eingeblasene Trockenluft der Trockner eingespritzten Dampfes angelegt werden.
  7. Vorrichtung gemäss Patentanspruch 6, dadurch gekennzeichnet, dass, wenn ein Regelungsventil (52) entweder einen Schliess- oder Öffnungsstop erreicht, dann das entsprechende Korrektursignal (qv) an die Heizung (54) der eingeblasenen Luft angelegt wird.
EP96103259A 1995-03-17 1996-03-02 Verfahren und Vorrichtung zum Regeln der Feuchtigkeit einer Materialbahn in einer Druckmaschine Expired - Lifetime EP0732198B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH766/95 1995-03-17
CH00766/95A CH690230A5 (fr) 1995-03-17 1995-03-17 Procédé et dispositif de contrôle de l'humidité d'une bande de matériau dans une machine d'impression.

Publications (3)

Publication Number Publication Date
EP0732198A2 EP0732198A2 (de) 1996-09-18
EP0732198A3 EP0732198A3 (de) 1996-09-25
EP0732198B1 true EP0732198B1 (de) 1999-05-19

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EP96103259A Expired - Lifetime EP0732198B1 (de) 1995-03-17 1996-03-02 Verfahren und Vorrichtung zum Regeln der Feuchtigkeit einer Materialbahn in einer Druckmaschine

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US (1) US5632201A (de)
EP (1) EP0732198B1 (de)
JP (1) JP3373998B2 (de)
KR (1) KR0162729B1 (de)
CN (1) CN1094833C (de)
AT (1) ATE180210T1 (de)
BR (1) BR9601040A (de)
CA (1) CA2171919C (de)
CH (1) CH690230A5 (de)
DE (1) DE69602479T2 (de)
DK (1) DK0732198T3 (de)
ES (1) ES2134524T3 (de)
TW (1) TW316873B (de)

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US7191516B2 (en) 2003-07-16 2007-03-20 Maxwell Technologies, Inc. Method for shielding integrated circuit devices
DE10356995A1 (de) * 2003-12-03 2005-07-07 Goss Contiweb B.V. Rollenrotationsdruckmaschine und Verfahren zur Verringerung von Zugwellen in einer Rollenrotationsdruckmaschine
JP4319532B2 (ja) * 2003-12-03 2009-08-26 富士フイルム株式会社 帯状体の加熱方法および帯状体加熱装置
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EP2322348B1 (de) * 2009-11-12 2012-07-11 Canon Kabushiki Kaisha Aufzeichnungsvorrichtung und Aufzeichnungsverfahren
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Also Published As

Publication number Publication date
EP0732198A2 (de) 1996-09-18
DE69602479D1 (de) 1999-06-24
CH690230A5 (fr) 2000-06-15
TW316873B (de) 1997-10-01
JPH08267728A (ja) 1996-10-15
JP3373998B2 (ja) 2003-02-04
ATE180210T1 (de) 1999-06-15
KR960033758A (ko) 1996-10-22
US5632201A (en) 1997-05-27
EP0732198A3 (de) 1996-09-25
CA2171919A1 (en) 1996-09-18
ES2134524T3 (es) 1999-10-01
DK0732198T3 (da) 1999-11-29
BR9601040A (pt) 1998-01-06
CN1094833C (zh) 2002-11-27
CN1135606A (zh) 1996-11-13
DE69602479T2 (de) 1999-10-21
CA2171919C (en) 2000-03-14
KR0162729B1 (ko) 1999-05-01

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