EP0732198A2 - 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
EP0732198A2
EP0732198A2 EP96103259A EP96103259A EP0732198A2 EP 0732198 A2 EP0732198 A2 EP 0732198A2 EP 96103259 A EP96103259 A EP 96103259A EP 96103259 A EP96103259 A EP 96103259A EP 0732198 A2 EP0732198 A2 EP 0732198A2
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European Patent Office
Prior art keywords
correction
printing
station
humidity
width
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Granted
Application number
EP96103259A
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English (en)
French (fr)
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EP0732198A3 (de
EP0732198B1 (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 comprising several stations each carrying out a printing in one of the fundamental colors coming to be superimposed on the previous ones.
  • Such a printing machine normally comprises a device for controlling the longitudinal and / or lateral register of the prints.
  • This device is usually based on the detection by one or more photoelectric cells, or other detectors, of the position of marks printed side by side and / or one behind the other in the margin by each station.
  • a computer receiving the signals from the detectors continuously determines the longitudinal and lateral registration errors and applies correction signals to move the compensating roller and the printing cylinders in order to correct the registration.
  • the humidity of the outgoing band of a station is dependent on a large number of factors such as the quality of the paper, the quality of the ink, the size of the prints, the humidity of the paper before printing, humidity and temperature of the air in the dryer, drying length and speed of the web in the machine.
  • factors such as the quality of the paper, the quality of the ink, the size of the prints, the humidity of the paper before printing, humidity and temperature of the air in the dryer, drying length and speed of the web in the machine.
  • a variation of 1% in the humidity of a strip of paper causes its transverse dimension to vary by 0.1%, or 3 millimeters for a strip 3 meters wide.
  • One of the tasks of the machine operator then consists, after checking the correct operation of the register control device in the center of the image, also checking the timing of the prints at the edges. If it detects a residual lateral error, it must then intervene manually on the dryers to best adjust the humidity of the strip from one station to another. However, this manual work is tedious and can only be carried out by qualified persons.
  • Document US Pat. No. 4,798,136 describes a method and device for automatic control of the printing register excluding printing marks at the edge and based on the reading of the physical width of the strip at the entrance to each station.
  • This strip width is measured by two lateral sensors each comprising a rod carrying at one end a roller in contact with the edge of the strip, the other end carrying a magnet moving in front of two electromagnetic reading windings.
  • the computer detects a variation in the width of the strip from one station to another, it only corrects the efficiency of the previous dryer, either by acting on the temperature of the drying roller in contact with the strip and heated by a electric resistance or by hot water or by steam, either by modifying the air flow or the electric heating of the blown air.
  • 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 color printing machine, which is more efficient. as for the timing accuracy of the prints one on top of the other and more dynamic in its feedback time.
  • this process must be able to be based on the expected result, namely the regularity of the width of the successive prints.
  • the design of the device for implementing the method must remain simple for production at a reasonable cost and facilitated maintenance.
  • the correction signals are applied to the quantity of steam injected into the drying air blown into the driers.
  • This quantity of steam injected makes it possible in particular to impose a predetermined value on the humidity of this drying air.
  • the function giving the humidity of the paper being dried is a decreasing curve over time towards an asymptote, of the logarithmic function type whose base is between zero and one, or of the power function type with negative exponent, of which the value of the lower asymptote is the value of the humidity of the blown air.
  • the drying curve of the paper is very quickly and very effectively modified, therefore the humidity at the outlet of the strip after a given delay as a function of the length of the dryer and of the scrolling speed.
  • the first secondary correction must preferably be between 7 and 50, and the second secondary correction must be between 1 and 15.
  • the widths of the successive prints are measured at the output of the printing machine in order to be able to examine the evolution of the errors from one station to another, and determine the direction of the secondary corrections as a function of this evolution.
  • This device comprises first means already used for adjusting the lateral and longitudinal register.
  • it can advantageously be connected simply to solenoid valves or to electric fan motor control cards, to power supply cards for electrical heating resistance. commercially available. The cost of producing the device according to the invention can therefore be controlled.
  • the electrical correction signals are applied to the valves controlling the water vapor injected into the drying air blown into the dryers. If a valve reaches the opening or closing stop, then the corresponding signal is applied to the heating of the supply air.
  • FIG. 1 In the upper part of FIG. 1 is shown schematically a machine for printing color images on a strip of material 2 such as a strip of paper or cardboard.
  • This printing machine for example of the gravure printing type, comprises 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 to give contrast to the final image.
  • the colors would be printed in reverse, from darkest to lightest. In this machine, it is necessary to completely dry the printing of one color before applying the next, in order to avoid any mixing or smearing.
  • the ink applied by a printing unit I can temporarily moisten the strip of paper which then tends to widen and which should be brought back to its original size before successive printing.
  • the paper strip 2 enters the machine with an initial humidity hp0 and leaves the dryer S1 of the first station with a humidity hp1 before being printed by the printing group I2, and so on. , the band leaving the following stations with a humidity of hp2 and hp3 respectively.
  • split photoelectric means comprising a mark detection device 10 situated above the right margin of the strip and another 20 situated 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 comprises photoelectric cells receiving directly, or via optical fibers, the reflected light 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 the movement of the strip.
  • the signals generated by these photoelectric detection means 10 and 20 are applied to electronic means 30, such as an image processing processor card, which first determine the width (l1, l2, l3, l4). effective of each impression by comparing the two corresponding right and left marks. Then, in a second step, these electronic means establish the possible difference from one impression to another ( ⁇ 12, ⁇ 23, ⁇ 34) as well as their evolution along the printing machine.
  • the digital data representative of these successive width differences are applied to a computer 40 which, according to algorithms and prerecorded parameter tables, establishes correction signals for each of the dryers S1, S2 and S3, according to a method described more in detail later.
  • the correction signals from the computer 40 are first applied to solenoid valves 52, 52 ', 52''for controlling the water vapor from a tank 60 and injected into the air blown into each of the 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.
  • FIGS. 3 to 5 representing, on the ordinate, the change in the humidity of the paper along the printing machine illustrated on the abscissa in FIG. 2, and this for different situations.
  • FIG. 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 value hp0 before next printing. Then the impressions IMP1, IMP2, IMP3 appearing along the abscissa appear at the output with a strictly identical width.
  • the effect of drying on the humidity of the paper is represented by an asymptotic decreasing curve, 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.
  • the exact shape of this drying curve depends on many factors including the length of the dryer, the profile of the variation along the dryer either of the flow or of the temperature of the blown air , and possibly the presence of heating elements in contact with the strip.
  • the ideal result of dryers S1 and S2 is to systematically reduce the humidity of the strip to its initial value hp0.
  • FIG. 3 illustrates a first situation of imbalance in which the impression IMP1 emerges narrower than the impressions IMP2 and IMP3 strictly of the same width. This comes from the fact, as illustrated by the curve in strong lines, that the value of the humidity hp1 of the strip at the outlet of the dryer S1 is substantially identical to the humidity hp2 of the strip at the outlet of the dryer S2, these two humidities on the other hand being appreciably lower than the initial humidity hp0 of entry into the machine. Then, after having been correctly printed, the printing IMP1 finds itself contracted by an excess of drying both on arrival in the printing group I2 and in the printing group I3.
  • action is taken on the setting of the solenoid valve 52 of FIG. 1 to increase the quantity of steam injected by a quantity Qv in order to increase the humidity of the blown air from a value HS to a HS1c value corrected.
  • This has the effect of immediately modifying the drying effect according to a curve illustrated in long dashed lines to the point of bringing the humidity hp1 of the strip at the outlet of the dryer S1 substantially equal to the inlet humidity hp0.
  • this first correction + Qv of the steam 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 a second value HS2c.
  • the humidity hp1 of the paper leaving the dryer S1 having increased, the effect of drying without correction in the dryer S2 would also have increased, to follow the curve illustrated in a short fine line, bringing the humidity of the paper leaving 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 secondary correction + qv has the effect of simultaneously increasing the humidity of the hp2 paper at the outlet of the dryer S2 so that only a residual correction remains weak to carry out during a second iteration to return to the ideal example according to figure 5.
  • an anticipation + qv of a secondary correction during a primary correction + Qv accelerated the process of return to the desired situation.
  • FIG. 4 illustrates a situation of inverse imbalance in which the first impression appears at the output too wide compared to the impressions IMP2 and IMP3 assumed here also identical. As illustrated by the solid line curve, this is due to the fact that the humidity hp1 of the strip leaving the dryer S1 is substantially equal to the humidity hp2 leaving the dryer S2, both being too high in relation to at an initial humidity of the hp0 strip.
  • a primary correction -Qv in the form of a reduction in the quantity of steam injected into the air blown into the dryer S1 brings the humidity of this air from a value HS1 to HS1c corrected to bring back the value of humidity hp1 at the outlet of the dryer S1 substantially equal to the initial value hp0.
  • this reduction in humidity at the outlet of the dryer S1 results in a reduction in the efficiency of the dryer S2 so that, according to the curve in a short fine line, the humidity hp2 remains substantially at its initial value.
  • the humidity of the air blown into the dryer S2 is also reduced from a value HS2 to a corrected lower value HS2c so that the humidity hp2 of the strip leaving dryer S2 is reduced, leaving only a small residual correction for a second iteration to quickly return to the ideal situation in FIG. 5.
  • the secondary correction + qv carried out in the same direction as the primary correction + Qv proves useful as soon as the impressions IMP2 and IMP3 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 as soon as the impressions IMP2 and IMP3 are identical or that the impression IMP3 is less than IMP2 printing. If on the other hand the means photoelectric 10, 20 and electronic 30 detect that the impression IMP3 is too high compared to the impression IMP2, then the computer 40 applies a secondary correction qv in the opposite direction.
  • the computer 40 can thus contain an algorithm processing each of the possible configurations of the evolution of the printing width of four colors along the printing machine and, for each configuration, applying in one direction or the other the secondary corrections on downstream dryers following a primary correction of an upstream dryer, these secondary corrections being decreasing.
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 true EP0732198A2 (de) 1996-09-18
EP0732198A3 EP0732198A3 (de) 1996-09-25
EP0732198B1 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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Country Link
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)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998018626A1 (de) * 1996-10-25 1998-05-07 Koenig & Bauer Aktiengesellschaft Anordnung zur korrektur des fan-out-effektes an rollenrotationsdruckmaschinen
CN112078230A (zh) * 2020-09-03 2020-12-15 武汉华茂自动化股份有限公司 自动套印控制系统带故障运行方法、电子设备及介质

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IT1275697B1 (it) * 1994-12-20 1997-10-17 Olmo Giancarlo Dell Metodo per stampare direttamente su carta microincisioni di ologrammi,chinogrammi,reticoli di diffrazione o microincisioni
FI108475B (fi) * 1998-05-13 2002-01-31 Metso Paper Inc Menetelmõ paperiradan mittaamiseksi
FI108871B (fi) * 1998-07-06 2002-04-15 Metso Paper Inc Menetelmä ja laite päällystetyn rainan kuivattamiseksi
US7191516B2 (en) 2003-07-16 2007-03-20 Maxwell Technologies, Inc. Method for shielding integrated circuit devices
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
DE10356995A1 (de) * 2003-12-03 2005-07-07 Goss Contiweb B.V. Rollenrotationsdruckmaschine und Verfahren zur Verringerung von Zugwellen in einer Rollenrotationsdruckmaschine
NL1025711C2 (nl) * 2004-03-12 2005-09-13 Q I Press Controls Holding B V Werkwijze en systeem voor het controleren van door een drukpers vervaardigd drukwerk.
EP2322348B1 (de) * 2009-11-12 2012-07-11 Canon Kabushiki Kaisha Aufzeichnungsvorrichtung und Aufzeichnungsverfahren
EP2551405B1 (de) * 2010-03-25 2015-12-16 Japan Tobacco, Inc. Maschine zur herstellung eines bahnmaterials mit geringer zündungstendenz, herstellungsverfahren dafür und verfahren zur herstellung eines zigarettenpapiers mit geringer zündungstendenz

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US4798136A (en) * 1982-04-16 1989-01-17 Interprint Rotatinsdruk Gmbh & Co. Kg Color printing method and arrangement
DE4327646A1 (de) * 1992-10-23 1994-04-28 Tokyo Kikai Seisakusho Tokio T Breiten-Einstellvorrichtung und -verfahren für eine Papierbahn sowie damit ausgerüstete lithographische Rotationspresse

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Publication number Priority date Publication date Assignee Title
US4798136A (en) * 1982-04-16 1989-01-17 Interprint Rotatinsdruk Gmbh & Co. Kg Color printing method and arrangement
DE4327646A1 (de) * 1992-10-23 1994-04-28 Tokyo Kikai Seisakusho Tokio T Breiten-Einstellvorrichtung und -verfahren für eine Papierbahn sowie damit ausgerüstete lithographische Rotationspresse

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998018626A1 (de) * 1996-10-25 1998-05-07 Koenig & Bauer Aktiengesellschaft Anordnung zur korrektur des fan-out-effektes an rollenrotationsdruckmaschinen
US6021713A (en) * 1996-10-25 2000-02-08 Koening & Bauer Aktiengesellschaft Arrangement for correcting the fan-out effect on web-fed printing presses
CN112078230A (zh) * 2020-09-03 2020-12-15 武汉华茂自动化股份有限公司 自动套印控制系统带故障运行方法、电子设备及介质

Also Published As

Publication number Publication date
CA2171919C (en) 2000-03-14
JP3373998B2 (ja) 2003-02-04
KR960033758A (ko) 1996-10-22
CN1135606A (zh) 1996-11-13
BR9601040A (pt) 1998-01-06
ATE180210T1 (de) 1999-06-15
DK0732198T3 (da) 1999-11-29
TW316873B (de) 1997-10-01
EP0732198A3 (de) 1996-09-25
DE69602479D1 (de) 1999-06-24
US5632201A (en) 1997-05-27
DE69602479T2 (de) 1999-10-21
CH690230A5 (fr) 2000-06-15
KR0162729B1 (ko) 1999-05-01
JPH08267728A (ja) 1996-10-15
CA2171919A1 (en) 1996-09-18
CN1094833C (zh) 2002-11-27
EP0732198B1 (de) 1999-05-19
ES2134524T3 (es) 1999-10-01

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