EP2250111A2 - Procédé et dispositif pour mesurer la pression dans la pince et/ou le profil de pression dans la pince d'une unité d'impression d'une presse à imprimer - Google Patents

Procédé et dispositif pour mesurer la pression dans la pince et/ou le profil de pression dans la pince d'une unité d'impression d'une presse à imprimer

Info

Publication number
EP2250111A2
EP2250111A2 EP09711484A EP09711484A EP2250111A2 EP 2250111 A2 EP2250111 A2 EP 2250111A2 EP 09711484 A EP09711484 A EP 09711484A EP 09711484 A EP09711484 A EP 09711484A EP 2250111 A2 EP2250111 A2 EP 2250111A2
Authority
EP
European Patent Office
Prior art keywords
nip
pressure
printing
roller
force
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.)
Withdrawn
Application number
EP09711484A
Other languages
German (de)
English (en)
Inventor
Tatu PITKÄNEN
Petteri Lannes
Mika Sundquist
Teuvo LEPPÄNEN
Raimo Rajala
Matti Innala
Teemu KÄLKÄJÄ
Klaus JERNSTRÖM
Mika J. Kosonen
Petri V. Hirvonen
Erik Ohls
Liisa Ranta
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.)
UPM Kymmene Oy
Valmet Technologies Oy
Original Assignee
UPM Kymmene Oy
Metso Paper Oy
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 FI20080102A external-priority patent/FI20080102A0/fi
Priority claimed from FI20080101A external-priority patent/FI20080101A0/fi
Application filed by UPM Kymmene Oy, Metso Paper Oy filed Critical UPM Kymmene Oy
Publication of EP2250111A2 publication Critical patent/EP2250111A2/fr
Withdrawn legal-status Critical Current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
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
    • B65H23/188—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0072—Devices for measuring the pressure between cylinders or bearer rings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/02—Advancing webs by friction roller
    • 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
    • B65H2515/30—Forces; Stresses
    • B65H2515/31—Tensile forces
    • B65H2515/314—Tension profile, i.e. distribution of tension, e.g. across the material feeding direction or along diameter of web roll
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2553/00—Sensing or detecting means
    • B65H2553/20—Sensing or detecting means using electric elements
    • B65H2553/26—Piezoelectric sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/03—Image reproduction devices
    • B65H2801/21—Industrial-size printers, e.g. rotary printing press

Definitions

  • the invention relates to a method for measuring the nip pressure and/or pressure profile in the nip of a printing unit of a printing press according to the introduction of claim 1.
  • the invention also relates to an arrangement for measuring the nip pressure and/or pressure profile in the nip of a printing unit of a printing press according to the introduction of claim 8.
  • the invention also relates to a method for adjusting a rotary printing press according to the introduction of claim 15.
  • the invention applies to improving the runnability of a printing press.
  • the invention applies to offset- and gravure printing techniques.
  • Offset printing technique is currently the most commonly used printing method.
  • the non-printing surface and the printing surface are on the same level, wherein it can also be referred to as a planographic printing method.
  • the printing element (printing plate) is a level surface on which can be discerned neither clearly raised areas (letterpress printing method) nor recesses (gravure printing method).
  • the planographic printing method is based on the mutual relationship between oil and water, i.e. on that they repel one another.
  • the offset printing method is based on the fact that oil (ink) and water repel one another.
  • the surface of the printing plate is exposed in a plate printer such that the areas to be printed become areas that attract oily printing ink but repel water.
  • the non-printing areas attract water but repel the oily ink. Because the printing ink is oily, it attaches only to areas accepting ink.
  • the image to be printed is not transferred directly from the printing plate to the paper rather first as a reversed image to the surface of the rubber cylinder, then from there the right way up to the paper.
  • the material of the paper is too hard and it would quickly wear down and damage the surface of the printing plate.
  • the dampening rollers dampen the surface of the printing plate and, at the same time, the inking rollers spread ink on the printing plate, wherein the dampening water attaches to the nonprinting areas and the printing ink attaches to the printing areas.
  • the printing ink transfers from the printing plate to the rubber cylinder and the paper travels between the rubber cylinder and the counter cylinder, wherein the ink transfers to the printing paper.
  • Offset printing can be done in rotary printing or in sheet-fed printing.
  • rotary printing presses an unbroken paper web travelling from a paper roll between the printing rollers is used as the printing paper which paper web is cut into page sheets only at the end of the presswork.
  • Rotary printing is a faster printing method than sheet-fed printing and, for this reason, it is used when the amounts to be printed are relatively large.
  • Gravure printing is a typographical printing method in which gravure printing presses are used.
  • the printing portion of the printing surface is lower than the non-printing surface.
  • the printing ink transfers to the material to be printed from the recesses in the printing surface from which the method got its name.
  • Gravure printing does not use as a printing surface printing plates secured around a cylinder, as in the offset printing, rather, on each printing occasion, the content to be printed is engraved into the copper surfaces of cylinders with an engraving diamond.
  • the advantage of gravure printing is that relatively cheap mechanical supercalenderized paper can be used.
  • Gravure printing presses are also generally web printing presses (i.e. rotary printing presses), i.e. presses whose printing material comes from a roll.
  • the gravure printing cylinder is first inked with a liquid printing ink, wherein the recessed cells on the surface of the cylinder are filled.
  • a thin steel scraper i.e. the doctor blade, removes the excess ink from the neck areas between the recessed cells.
  • the material to be printed travels between the impression cylinder and the gravure cylinder, wherein the printing ink is transferred from the recessed cells to the material to be printed with a great compression force.
  • the printing material travels through a drying device which evaporates the solvent of the printing ink and dries the printing ink.
  • the invention applies to diagnosing the nip of the printing unit of a printing press.
  • a printing press there are usually several printing units for different colours of printing ink.
  • a four-colour press for example, there are 4 units, one for black, one for cyan, one for magenta and one for yellow ink.
  • the nip can be, for example, between two or more rollers, between a tightened belt and a roller, or between a stiff plate and a roller.
  • the nip is formed when the web or sheet-like piece goods are compressed by the roller, belt, shoe or some similar element.
  • the nip is then not just the area of compression between two rollers. '
  • one printing unit there are several rotating rollers/cylinders for different purposes and nips which are formed between two rotating rollers/cylinders such that the printing ink can transfer from the ink trough or suchlike via the nip formed by several pairs of rollers to the rubber cylinder and, finally, from the rubber cylinder to the paper, plastic or other thin sheet-like material onto which the printing ink is printed in the printing unit of the printing press.
  • One of the nips of the printing unit is a so-called printing nip formed by the rubber cylinder and another cylinder or by two cylinders through which nip travels paper, plastic or other thin sheet-like or web-like material.
  • the printing nip causes the transfer of ink to the surface to be printed. If there is too much printing ink or if the web, for some reason, sticks to the roller and detaches later, then the force of detachment increases. In that case, the web attached to the surface of the roller may break or the print quality may decrease. The web's sticking to the roller may, for example, result from changes in adhesion between the printing ink and the roller or between the printing ink and the paper.
  • the counter cylinder In the printing unit, the counter cylinder is coated with rubber.
  • the function of the rubber is to assure the transfer of the printing ink to the substrate to be printed. Wearing on the rubber coating or an incorrect nip pressure will weaken the print quality. Currently, wearing cannot be monitored otherwise than by manual observation by the operators.
  • the printing ink and dampening water added in the printing unit have influence on the control of the web after the printing unit. If an excessive amount of ink is used, this will cause the rollers to become dirty. Excessive ink use also increases printing costs. Additionally, in the printing unit of the printing press, moisture from the printing ink and dampening water is also transferred into the paper. This decreases the web tension which can cause problems with runnability or colour superimposition.
  • dosing of ink amounts is based on the personal experience of the printer/operator. Colour shades are measured with a densiometer but by using it is not possible to control problems caused by the hydroexpansion of the web. Additionally, a disadvantage of gravure printing presses is that the profile of the doctor blade is not known, wherein application of inks can be uneven.
  • the object of the invention is to solve the above mentioned problems.
  • the object of the invention is achieved by a method according to independent claim 1.
  • the invention also relates to an arrangement according to independent claim 8.
  • the invention also relates to a method according to independent claim 15.
  • the preferred embodiments of the invention are presented in the dependant claims.
  • the basis for the invention is that by installing a force and/or pressure sensor, such as an electromagnetic film sensor, on the counter roller, rubber roller or roller of the printing unit which participates in transferring printing ink to the paper, plastic, or other thin sheet-like surface, the event in the nip can be measured and the nip pressure and/or pressure profile of the nip can be calculated or produced or estimated.
  • a force and/or pressure sensor such as an electromagnetic film sensor
  • the position of the rollers can be adjusted or the rollers can be manually profiled by the users or using automation, wherein, for example, the ink use can be decreased, hydroexpansion of the web can be better controlled and the colour superimposition can be improved.
  • the basis for the invention is also that, in the printing press, a so-called iRoll roller is used with which the measurement is based on the use of a pressure sensitive film.
  • an iRoll tension measuring roller can be installed, and the information from this can be used as the basis for dosing the amount of ink or water such that the tension profile remains stable, wherein the runnability also remains good.
  • the optimization of ink consumption is also possible.
  • a more exact measurement is obtained if the tension profile measurement roller is located both before and after the printing unit. In that case, the difference profile of tension depending on the amount of ink can be calculated.
  • the iRoll nip profile measurement can also be used to monitor and adjust the amount of inks and dampening water and evenness of application.
  • the nip profile measurement is installed in an offset press, for example, to the ink transfer roller and the measurement of the doctor blade force profile is installed in a gravure printing press, for example, to the printing roller.
  • the sensor film By installing a pressure sensitive sensor film on the surface or below the coating of a roller in the printing nip, it is also possible to measure the site of the detachment line and the form of the detachment line.
  • the sensor film In relation to the roller, the sensor film can be installed in the 'axial direction (cross-directionally) or alternatively peripherally (in the direction of the periphery of the blanket).
  • the measurement result can be transmitted to an automation system from which comes info ⁇ nation to the control system of web tension. For example, under the influence of delay of the detachment point of the web, the automation system increases the web tension, wherein the detachment occurs earlier influencing the site and fo ⁇ n of the detachment line.
  • the detachment angle of the web can also be adjusted by means of the web tension or another adjustment parameter. If the web follows the counter roller after the printing nip, then it will decrease the print quality and may, at the worst, cause the breakage of the web and the loss of production.
  • the angle of detachment can be influenced, among other factors, by the position of the next web guidance element after the printing nip, the profile of the printing nip, characteristics of the rubber coating, process temperature and characteristics influencing the printing ink adhesion. With a cross-directionally, spirally installed iRoll sensor, the profile of the nip can be measured which is used in profiling.
  • the detachment line By profiling the profile of the nip directly or as a desired profile in relation to the amount of printing ink in the cross direction, the detachment line can be corrected.
  • the tension profile can be measured which is profiled by means of actuators suited to this purpose, wherein the detachment line can also be optimized to make it straight when variations in the tension profile are eliminated.
  • the detachment line can be optimized. For example, at a site, where there is a great deal of "viscous" printing ink and the web continues further than a second roller, the tension is increased slightly, wherein the detachment occurs directly.
  • the adjustment parameter can, of course, also be another parameter influencing the detachment line, such as the direction of the departure angle of the web from the printing nip, or, for example, some characteristic influencing the detachment angle of the printing ink.
  • To the roller can also be installed point-like sensors, wherein is measured “sticking " in the machine direction caused by the nip contact and the viscosity of the printing ink.
  • a sensor has previously been installed on the surface of the roller and the cylinder but it can also be installed in the covering or coating of a detachable roller or cylinder which can easily be exchanged for a new one. Sensor placement in the coating can be done as a part of the coating production process but installation to some area of the coating is also possible after the production of the coating.
  • sensors can be quickly and inexpensively replaced, if needed, for example, if a sensor breaks or if, for some other reason, a sensor must be changed. It is advantageous for sensor placement if the sensor locates on the bottom side of the covering, i.e. on the side that is against the roller or cylinder. In that case, the sensor least disturbs the nip event. It is also advantageous if the sensor and the coating have in the installation level of the sensor physical characteristics that are as similar as possible. In that case, no site of discontinuity is created between the materials. The same kind of sensor placement could be used, among other examples, for measuring the printing nips during printing or in corresponding processes where the coating of the roller must be changed at regular intervals.
  • a pressure sensitive measurement film installed under the printing rubber or printing plate can also function as the measurement sensor of the nip profile of a printing nip.
  • EMFI or PVDF a pressure sensitive measurement film installed under the printing rubber or printing plate
  • the film there is arranged a narrow ribbon-like active area which measures the load profile of the printing nip when the ribbon-like portion winds over the nip.
  • the rest of the film is of the same material but is electrically passive.
  • the advantage in this is that the ribbon-like portion of the film does not disturb the nip load being measured because the portions of the film are essentially equally thick.
  • the active area is arranged such that the conducting area collecting the charge is only in the ribbon-like portion.
  • the thickness of the conductive layers is the amount by which the thickness of the ribbon-like portion exceeds that of the passive portion of the film, i.e. the thickness is about 10-20 ⁇ m which, in practice, does not disturb the nip profile.
  • the width of the ribbon-like portion is preferably 10-20 mm and its thickness is 10-20 ⁇ m greater than the thickness of the passive portion of the film.
  • the pressure sensitive film has metallic coating for grounding as the EMFi film usually does.
  • a film the size of a printing rubber or printing plate has both a passive portion of the film and an active portion of the film which active portion of the film is ribbon-like and its thickness is slightly greater due to the conductive layers, approximately 10-20 ⁇ m, compared to the passive portion of the film which passive portion of the film is located on both sides of the active film.
  • the active and passive portions contain the same kind of conductive layer but the ribbon-like active portion is isolated from the passive portion, wherein only a narrow isolating portion is of differing thickness in the narrow, approximately 100 ⁇ m wide neck area.
  • a film the size of a printing rubber or printing plate has both in the active portion and in the passive portion the same kind of conductive layer having the same thickness but between the ribbon-like active area and the passive portion is made, for example, by cutting the conductive layer a thin crack which isolates the measuring active portion from the passive portion.
  • the cracks are then located on both sides of the active portion and in width they are preferably, for example, 100 ⁇ m wide.
  • Addition of ink to the paper web causes changes in the tension of the web.
  • Web tension is measured in an iRoll measurement in the machine direction, i.e. lengthwise in relation to the web. If the measuring sensor is installed cross- directionally, then a measurement result is obtained for the entire length of the web. In that case, a cross-directional profile is obtained for the lengthwise tension of the web. In practise, the tension of the web is never entirely even throughout the entire length of the web.
  • the amount of ink and/or dampening water can be adjusted locally (profiled) cross-directionally. In that case, for example, the amount of dampening water can either be increased or decreased at the edges of the web.
  • roller nip profiles and nip forces of the ink feed and dampening equipment in an offset press can be measured and these can be adjusted to optimize the evenness of ink feed.
  • the load force and force profile of the doctor blade can be measured with iRoll sensors installed under the roller coating.
  • the influence of inks and/or dampening water on the web tension profile can be measured first.
  • the iRoll tension profile measurement is made before and after the printing unit and their difference profile is determined.
  • the iRoll force profile of the doctor blade is checked, and the blade force is adjusted to the type desired (the magnitude of the blade force, the difference between the halves, and possibly even adjustment of profiling). After this, the tension profile is monitored and further actions are taken, if needed.
  • Above mentioned measurement and adjustment actions can be executed either manually or automatically.
  • the invention preferably, but not necessarily, utilizes measurement methods of the type in publications WO 2006/075055 and WO 2006/075056 (METSO PAPER, INC.) and/or iROLL technology (METSO PAPER, INC.) for measuring the nip pressure and/or pressure profile.
  • the invention preferably, but not necessarily, utilizes as a force and/or pressure sensor an electromagnetic film sensor, such as a piezo film, such as a EMFi film sensor, which is a permanently electrically charged cell plastic film which functions in the same manner as a piezoelectric sensor.
  • the EMFi film is a foamed, plastic film with a metallic coating and an electrical charge which converts any mechanical movement caused to the film into electrical energy.
  • the voltage signal produced by an EMFi film depends on the sum pressure change exerted on the element such that, when a pressure change occurs, each portion of the element produces an equally large change in the initial voltage. Consequently, the short-term voltage measured with a large-impedance amplifier is the integral of the sum pressure of the sensor.
  • the sensor functions as a dynamic sensor, it does not give a steady result for a sustained applied pressure rather the direct-current voltage component influencing across the sensor changes as a result of leakage currents. Because of this, the sensor functions only when it experiences changes in pressure.
  • a solution according to the invention can also be implemented by means of another sensor, for example, by means of a resistive pressure sensitive film, a piezoelectric PVDF film (polyvinylidene fluoride film) or a PLL film (piezo-pyroluminescent film).
  • a resistive pressure sensitive film for example, by means of a resistive pressure sensitive film, a piezoelectric PVDF film (polyvinylidene fluoride film) or a PLL film (piezo-pyroluminescent film).
  • the force and/or pressure sensor is installed under the rubber coating of the counter cylinder of the printing unit. Rubber coatings develop wear during printing, wherein the load of the printing nip weakens.
  • the load of the printing nip can be adjusted manually or automatically to an already familiar and well- tried load level. In that case, a uniform print quality is assured even with a worn coating, diagnostic information regarding wear is obtained, and, if needed, the rubber coating can be replaced for a new one.
  • the measurement shows on the profile display the change as a local change in profile shapes.
  • a force and/or pressure sensor can be used for monitoring/diagnostics of wearing of the rubber coating and, if needed, for compensating adjustments.
  • a measuring pressure sensitive film is installed preferably in a shallow groove made on the surface of the cylinder under the rubber coating.
  • Rollers in the nip can be profiled, for example,
  • printing press operators adjust the printing nip as well as the amount of inks and dampening water based on experience.
  • the printing event is made more uniform on a level based on experience and dependant upon the operator.
  • the web control improves as the feeding of extra ink is decreased and, at the same time, there is attained an ability to see what occurs during printing. This improves opportunities to adjust devices in the proper direction.
  • the sensor placement in the printing nip is easy to detect and monitor.
  • Fig. 1 shows the use of a tension measurement and blade profile according to the invention in a gravure printing press for ink adjustment
  • Fig. 2 shows the use of a nip profile measurement according to the invention for adjustment of inks and/or dampening water in an offset press
  • Fig. 3 shows schematically the length of the nip in a printing nip
  • Fig. 4 shows the detachment of the web from the roller of the printing cylinder in an offset press and the influence of ink on the detachment.
  • Fig. 1 depicts one unit of a gravure printing press in which is, by way of example, marked possible rollers from which a tension profile can be measured. Additionally, in the figure, there is shown the site for measurement of the blade profile of the doctor blade on the printing roller.
  • Fig. 2 shows the length of the nip in a printing nip.
  • Fig. 4 depicts the travel of the paper web (13) between the upper rubber roller (17) and the lower rubber roller (18), wherein, as the paper web detaches from the roller, the printing ink (19) also detaches and attaches to the paper web.
  • the web detaches from the lower rubber cylinder earlier and follows the upper cylinder for a short distance.
  • Fig. 4 depicts the detachment of the web from the surface of the printing cylinder in an offset press. In the cross-directional sites of the press, in which the detachment occurs later, the web tension is increased or the linear load is reduced. When the tension increases, the web tension pulls the web free from the upper roller earlier. When the linear load decreases, the length of the nip decreases and the detachment also occurs earlier. Both the tension and nip profiling require actuators suitable for those purposes.
  • the invention relates to a method for measuring the nip pressure and/or pressure profile in the nip of a printing unit of a printing press.
  • one or more force and/or pressure sensors such as an electromagnetic film sensor, for example, an EMFi film sensor, are installed on the counter roller, rubber roller or roller forming the nip of a printing unit which participates in the printing unit in transferring printing ink onto the paper, plastic or other thin sheet-like material surface, wherein the pressure sensitive film is adapted to produce, in connection with a deformation of the force and/or pressure sensor, an electrical signal corresponding to the magnitude of the deformation.
  • the rollers forming the nip are caused to rotate in relation to one another, for example, by using the printing press such that the nip pressure in the nip causes a deformation of the force and/or pressure sensor producing an electrical signal corresponding to the magnitude of the deformation.
  • the nip pressure and/or pressure profile of the nip is calculated or produced or estimated by using an electrical signal produced by the deformation of the force and/or pressure sensor.
  • the force and/or pressure sensor is preferably, but not necessarily, installed on the counter roller of the printing nip of the printing unit. In the method, the force and/or pressure sensor is preferably, but not necessarily, installed under the rubber coating of the counter roller of the printing nip of the printing unit.
  • the force and/or pressure sensor is preferably, but not necessarily, installed on the roller in a spirally slanting manner. In the method, the force and/or pressure sensor is preferably, but not necessarily, installed in a groove on the roller.
  • the electrical signal produced by a deformation of the force and/or pressure sensor arranged on the roller is preferably, but not necessarily, transmitted from the roller with the force and/or pressure sensor wirelessly to a data processing device for the purpose of calculating or producing or estimating the nip pressure and/or pressure profile.
  • the electrical signal produced by the deformation of the force and/or pressure sensor arranged on the roller is preferably, but not necessarily, transmitted from the roller with the force and/or pressure sensor at least partially wirelessly to the automation system of the printing press for the purpose of calculating or producing or estimating the nip pressure and/or pressure profile, wherein the automation system of the printing press adjusts the nip, if needed, on the basis of the calculated nip pressure and/or pressure profile.
  • the automation system of the printing press produces diagnostic information about the nip on the basis of the calculated nip pressure and/or pressure profile.
  • the automation system of the printing press produces an alarm on the basis of the calculated nip pressure and/or pressure profile.
  • the invention also relates to an arrangement for measuring the nip pressure and/or pressure profile in the nip of a printing unit of a printing press.
  • a force and/or pressure sensor such as an electromagnetic film sensor, for example, an EMFi film sensor
  • an electromagnetic film sensor for example, an EMFi film sensor
  • the pressure sensitive film is adapted to produce, in connection with a deformation of the force and/or pressure sensor, an electrical signal corresponding to the magnitude of the deformation.
  • the force and/or pressure sensor is preferably, but not necessarily, installed on the counter roller of the printing nip of the printing unit.
  • the force and/or pressure sensor is preferably, but not necessarily, installed under the rubber coating of the counter roller of the printing nip.
  • the force and/or pressure sensor is preferably, but not necessarily, installed on the roller in a spirally slanting manner.
  • the force and/or pressure sensor is preferably, but not necessarily, installed in a groove on the roller.
  • the arrangement preferably, but not necessarily, comprises a transmission arrangement for transmitting wirelessly the electrical signal produced by the force and/or pressure sensor from the roller with the force and/or pressure sensor for the purpose of calculating or producing or estimating the nip pressure and/or pressure profile.
  • the arrangement preferably, but not necessarily, comprises a transmission arrangement for transmitting at least partially wirelessly the electrical signal produced by the force and/or pressure sensor from the roller with the force and/or pressure sensor to the automation system of the printing press for the purpose of calculating or producing or estimating the nip pressure and/or pressure profile, wherein the automation system of the printing press is adapted to adjust the nip, if needed, on the basis of the calculated nip pressure and/or pressure profile. Alternatively or additionally, the automation system of the printing press is adapted to produce diagnostic information about the nip on the basis of the calculated nip pressure and/or pressure profile.
  • the automation system of the printing press is adapted to produce an alarm on the basis of the calculated nip pressure and/or pressure profile.
  • the invention also relates to a method for adjusting a rotary printing press, characterized in that the crosswise profile of tension in the machine direction of the printing substrate used in the rotary printing press is measured from some process site roller of the printing press and/or the nip pressure and/or pressure profile is measured from at least one roller forming the nip which participates in the printing unit in transferring printing ink onto the printing surface of the substrate, such as paper, plastic or other thin web-like material surface, and the printing process is adjusted on the basis of the information obtained.
  • the nip pressure and/or pressure profile of the nip is measured by installing a pressure sensor, such as a pressure sensitive film, for example, an EMFi film sensor, on the counter roller, rubber roller or roller forming the nip of a printing unit which participates in the printing unit in transferring printing ink onto the surface of the printing substrate, wherein the pressure sensitive film is adapted to produce, in connection with a deformation of the pressure sensor, an electrical signal corresponding to the magnitude of the deformation, causing the rollers forming the nip to rotate in relation to one another such that the nip pressure of the nip causes a deformation of the pressure sensor producing the electrical signal corresponding to the magnitude of the deformation, and calculating the nip pressure and/or pressure profile of the nip by using the electrical signal produced by the deformation of the pressure sensor.
  • a pressure sensor such as a pressure sensitive film, for example, an EMFi film sensor
  • the measured crosswise tension profile of the printing substrate is compared to a known basic tension profile, a deviation between the basic tension profile and the measured tension profile is analysed, and the printing process is adjusted on the basis of the deviation in the tension profile.
  • the basic tension profile can be a tension profile obtained from the paper factory for the paper roll or the basic tension profile is based on data collected earlier from the same roller.
  • the basic tension profile can also be a tension profile obtained from another process site in the printing process, such as a tension profile obtained from a measurement after the unwinder.
  • the invention relates to a method in which the angle of detachment between a web-like printing substrate and a roller transferring ink is adjusted on the basis of measurement information obtained.
  • the angle of detachment of the web can be adjusted by changing one or more of the following factors: web tension, position of the next or previous web guidance element, profile of the printing nip, machine speed, web strain, a characteristic of the rubber coating of a roller, process temperature, amount of printing ink, amount of water and dryness of the web.
  • the profile of the printing nip can be changed by heating the metal roller in the nip contact using inductive heating, or otherwise warming the roller or roller coating.
  • the method according to the invention comprises the adjustment of the printing process by adjusting a roller of the printing press.
  • the roller to be adjusted can be a guide roller, roller nip, dancing roller, leading roller or drawing roller. Correction of nip distortion can be done by changing the position of the rollers in relation to one another or by loading one end of a roller more than the other end.
  • the sum level of nip force can be adjusted by means of pneumatic, hydraulic, or mechanical actuators.
  • the tension profile can be measured with a movable film-like pressure sensor that can be installed on the surface of a roller or with a permanent roller which contains a film-like pressure sensor.
  • the information obtained from measurements can also lead to the adjustment of the process which comprises the maintenance of the roller system. Maintenance requirements may be washing a roller, sanding a cylinder, replacing a coating and/or overhauling roller bearings.
  • the method according to the invention adapts, in particular, to the adjustment of an offset printing process and a gravure printing process.
  • the load force and force profile of the doctor blade can also be measured with sensors installed under the coating of a roller.
  • the blade load can be adjusted to the desired type by changing the magnitude of the blade force.
  • the influence of inks and/or dampening water on the web tension profile is measured by executing a web tension profile measurement before and after the printing unit and defining their deviation profile after which the amount of inks and/or dampening water is adjusted, if needed.
  • Adjustment of the printing process and/or printing apparatus can be done manually but the method also enables the use of an automation system.
  • the invention is directed also to a computer program into which is fed information obtained from the method according to the invention and which guides the automated adjusting of the claim as described above. It is obvious to a person skilled in the art that, as technology develops, the basic idea of the invention can be implemented in many different ways. The invention and its embodiments are not then limited only to the examples presented in the above rather many variations are possible within the scope of the claims.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

La présente invention concerne un procédé et un dispositif permettant de mesurer la pression dans la pince et/ou le profil de pression dans la pince d'une unité d'impression d'une presse à imprimer. Un détecteur de force et/ou de pression tel qu'un film sensible à la pression, par exemple un détecteur à film électromécanique ou "EMFi" (Electro-Mechanical Film) est installé sur le contre-cylindre, le cylindre caoutchouté ou le cylindre de pince d'une unité d'impression, et qui, dans l'unité d'impression, participe au transfert d'encre sur la surface du papier, du plastique ou d'un autre matériau fin en feuille. En l'occurrence, ce film sensible à la pression est conçu pour produire, en relation avec une déformation du détecteur de force et/ou de pression, un signal électrique correspondant à la grandeur de la déformation. Les cylindres formant la pince sont mis à tourner l'un par rapport à l'autre de façon que la pression de pince dans la pince entraîne une déformation du détecteur de force et/ou de pression produisant un signal électrique correspondant à la déformation de la pince. Pour calculer la pression dans la pince et/ou le profil de pression dans la pince, on utilise le signal électrique produit par la déformation du détecteur de force et/ou de pression.
EP09711484A 2008-02-12 2009-02-10 Procédé et dispositif pour mesurer la pression dans la pince et/ou le profil de pression dans la pince d'une unité d'impression d'une presse à imprimer Withdrawn EP2250111A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20080102A FI20080102A0 (fi) 2008-02-12 2008-02-12 Menetelmä ja järjestely painokoneen painoyksikön nipin nippipaineen ja/tai paineprofiilin mittaamiseksi
FI20080101A FI20080101A0 (fi) 2008-02-12 2008-02-12 Menetelmä painokoneen säätämiseksi
PCT/FI2009/050103 WO2009101251A2 (fr) 2008-02-12 2009-02-10 Procédé et dispositif pour mesurer la pression dans la pince et/ou le profil de pression dans la pince d'une unité d'impression d'une presse à imprimer

Publications (1)

Publication Number Publication Date
EP2250111A2 true EP2250111A2 (fr) 2010-11-17

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EP (1) EP2250111A2 (fr)
WO (1) WO2009101251A2 (fr)

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WO2011148031A1 (fr) 2010-05-25 2011-12-01 Metso Paper, Inc. Procédé et appareil pour la commande d'une tête de couchage, et tête de couchage
DE102017008216A1 (de) 2017-09-01 2019-03-07 DIVGmbH Vorrichtung und Verfahren zur vollflächigen Detektion und Verortung von Markierungsstellen und/oder Fehlstellen auf flächenförmigen und linienförmigen Gütern

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WO2009101251A2 (fr) 2009-08-20

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