EP3116718A1 - Vorrichtung und verfahren zum trocknen von bedruckten behältern - Google Patents
Vorrichtung und verfahren zum trocknen von bedruckten behälternInfo
- Publication number
- EP3116718A1 EP3116718A1 EP15712547.7A EP15712547A EP3116718A1 EP 3116718 A1 EP3116718 A1 EP 3116718A1 EP 15712547 A EP15712547 A EP 15712547A EP 3116718 A1 EP3116718 A1 EP 3116718A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- container
- drying
- sensor
- curing
- printed
- 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
Links
- 238000001035 drying Methods 0.000 title claims abstract description 201
- 238000000034 method Methods 0.000 title claims description 36
- 238000006243 chemical reaction Methods 0.000 claims abstract description 76
- 238000007639 printing Methods 0.000 claims description 91
- 230000005855 radiation Effects 0.000 claims description 28
- 238000011156 evaluation Methods 0.000 claims description 23
- 238000001514 detection method Methods 0.000 claims description 19
- 230000009471 action Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 230000000977 initiatory effect Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 1
- 230000004913 activation Effects 0.000 description 24
- 230000008569 process Effects 0.000 description 20
- 238000007689 inspection Methods 0.000 description 6
- 238000004132 cross linking Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000005022 packaging material Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 230000000191 radiation effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
- B41J3/4073—Printing on three-dimensional objects not being in sheet or web form, e.g. spherical or cubic objects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0015—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
- B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
- B41J11/0021—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation
- B41J11/00214—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation using UV radiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
- B41J3/4073—Printing on three-dimensional objects not being in sheet or web form, e.g. spherical or cubic objects
- B41J3/40733—Printing on cylindrical or rotationally symmetrical objects, e. g. on bottles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0015—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
- B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
- B41J11/0021—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation
- B41J11/00212—Controlling the irradiation means, e.g. image-based controlling of the irradiation zone or control of the duration or intensity of the irradiation
Definitions
- the invention relates to a device for drying printed containers according to the preamble of patent claim 1 and to a method for determining the degree of drying of printed containers according to the preamble of patent claim 12.
- Devices for printing on packaging materials in particular also for applying a color or multicolor printing to packaging means, are known and comprise, for example, a transport path on which the printing of the packaging material takes place, specifically with the corresponding printing units or print heads producing the color sets are provided on the transport route.
- the printheads are, for example, electrically or electronically controllable printheads or printing units, e.g. printing heads operating according to the principle of ink-jet printing (WO2004 / 00936) or printing heads operating under the name "Tonjet principle.” With these, ink is directly applied to the container wall in order to produce the printed image.
- printing devices have drying and hardening devices by means of which a drying or hardening reaction on the freshly printed container can be effected.
- the degree of dryness and thus the degree of curing of the printing ink used during printing can not be determined directly within the process. This is particularly problematic because the drying or hardening of the printing ink or printing ink has a significant influence on their migration ability through the container wall into the container interior.
- the risk of blurring of the printed image for example, by touching or other contact of the printed container with other machine components such as guides or the like, the risk of migration of the ink or ink or their constituents in the recorded in the container contents.
- a further disadvantage of not completely cured printing ink or printing ink is that the printed image applied to the container wall blurs into each other after some time by running the print image areas, which leads to an overall deteriorated print image quality.
- the invention relates first of all to a device for drying printed containers comprising a peripherally drivable transport element with container treatment stations provided thereon, wherein the containers accommodated at the container treatment stations are transported by the transport element on an inward transport container be moved between at least one container task and at least one container decrease.
- the transport element can be, for example, a rotor driven peripherally about a machine vertical axis, in particular a rotor driven continuously in rotation.
- the container treatment stations may be, for example, combined pressure-drying stations, in which both the printing and the drying or hardening of the printing ink or printing ink is effected.
- the container treatment stations additionally have at least one application head (in particular printhead) by means of which the printing or coating, ie the formation of a base or cover layer, takes place.
- the container treatment stations can also be designed as drying stations where already printed containers are only subjected to drying or curing.
- the container treatment stations are each assigned at least one drying and curing device for effecting a drying reaction on the printed containers.
- a sensor is provided, which is designed for detecting the heat energy or radiation or the temperature emitted by the container subjected to the drying or hardening reaction.
- the sensor determines the temperature of the container in the region of the print image which is applied to the container. This determination of the heat energy is preferably carried out without contact, for example by the IR radiation radiated from the container or the printed image thereon.
- the heat energy emitted by the printed container is preferably determined during the movement of the container through the transport element.
- the degree of drying or curing of the printing ink or the printing ink can be determined and in particular in-line, i. during operation of the drying and curing device, as a correlation to the radiated heat energy or thermal radiation (time course).
- the drying and curing devices are designed to effect an exothermic drying or curing reaction on the printed container and the sensor is designed to detect the heat energy emitted by the container and caused by the exothermic drying or curing reaction.
- the invention is based on the finding that in particular by UV irradiation of the printed image by corresponding emitters of the drying and curing device, a chemical drying reaction or curing reaction is triggered, the so-called pinning or curing, which is exothermic, ie it is at the expiration of chemical reaction releases heat energy. Based on this knowledge, it can be determined whether the drying reaction has been initiated.
- the degree or intensity of the initiated drying reaction can be determined and thus draw conclusions on the curing of the printing ink or the printing ink after completion of the drying process. be gene.
- the drying reaction is merely initiated by the drying and curing device, ie the action of the drying and curing device on the container represents only one activation step of the drying reaction and the drying reaction also takes place after passing through the drying and curing device for a certain Period until the final curing or crosslinking is achieved.
- the wet ink film consists of color pigments, binders which may be, for example, monomers or oligomers, and photoinitiators which exist in the form of a double bond in the wet ink film.
- the photoinitiators When this wet dye or ink film is subjected to UV radiation from the drying and curing device, the photoinitiators are activated, with the high-energy UV radiation breaking the double bond of the photoinitiators, so that free radicals are formed.
- the free radicals resulting from the activation of the photoinitiators crosslink in the following with the binders, ie the monomers and / or the oligomers to macromolecules.
- the drying process is complete. This process is exothermic, ie it proceeds with the release of thermal energy.
- the UV radiation emitted by the drying and curing device acts only as a trigger, ie, the crosslinking process continues even after passing through the drying device, so that at least a certain period of time after the irradiation by the UV radiation emitted from the print image thermal energy measurable is.
- This thermal energy is detected by one or more sensors and used to determine whether a drying reaction has been initiated or to determine the degree of drying reaction or its intensity. This is a capture the drying and curing reaction and thus a detection of Trocknungspp. Curing degree of the ink or printing ink after completion of the Trockungspp. Curing reaction or downstream to the drying and curing device contactless possible. Indirectly, the function and quality of the UV emitter is monitored with the thermo-sensitive sensor.
- the senor is formed by an infrared sensor.
- this infrared sensor can be detected by the printed container heat energy emitted by the drying reaction or the crosslinking detected.
- a detection of a plurality of measured values takes place at different points of the printed image in order to obtain information regarding the curing or crosslinking of the printing ink or of the printing ink in different printed image areas.
- the sensor preferably has optics for the focused detection of the heat energy radiated by the container.
- optics for the focused detection of the heat energy radiated by the container.
- a selective detection of the heat energy radiated from the container can take place, in particular by suppressing thermal energy radiation from further machine elements which heat up during operation, for example the printhead etc.
- a specially adapted sensor optics has the advantage that heat radiation from other heated surfaces (defect areas), such as, for example, the surfaces of the print head, can be reliably detected and distinguished from the container surface to be inspected and the area of the printed image.
- a plurality of sensors are provided, wherein in each case one sensor is assigned to a defined printed image area, so that heat energy radiated different pressure ranges can be detected parallelized by different sensors.
- the device has a multiplicity of container treatment stations, wherein each container treatment station is assigned an independent sensor. This can be done at each container treatment station, a check of the drying or curing degree of the printed container.
- the sensor is provided in the direction of movement of the container or the printed surface of the container after the drying and curing device.
- the device may be designed such that the container is rotated at the container treatment station about the container vertical axis and that the sensor is arranged in the direction of rotation after the drying and curing device, in particular immediately after the drying and curing device. Due to the rotation of the container about the container vertical axis, a relative movement of the container with respect to the drying and curing device is achieved. By means of this relative movement can be acted upon by the drying and curing device on all print image areas. When the sensor is provided in the direction of rotation after the drying and curing device, the thermal energy radiated from the container in the region of the printed image can be determined immediately after the activation of the drying or hardening reaction.
- the senor has an evaluation unit or the sensor is connected to an evaluation unit, by means of which the degree of drying of the printed container ters based on the detected by the sensor heat energy can be determined.
- the radiated heat energy is detected by the sensor and directed to one or more detectors. In the detector, the heat energy, in particular the energy of the IR radiation is converted into electrical signals, which are then converted into temperature values.
- the evaluation unit can be designed to determine the degree of curing depending on the determined temperature values or the radiated heat energy, ie from the measured after activation of the drying reaction temperature values can be closed by the evaluation unit to the curing of the printed image after completion of the drying or curing process become.
- the evaluation unit or a control unit connected thereto can, for example, control the drying and curing devices in such a way that the activation intensity is increased, ie, for example, the UV radiation intensity is increased. Even failures of drying and curing facilities can be detected in this way. Furthermore, it is possible to adequately seed out insufficiently hardened containers in the further course of the transport route.
- the determination of the degree of dryness takes place taking into account at least one reference measured value.
- the reference reading is in particular the temperature of the container before the activation of the Drying reaction.
- This reference value can preferably also be determined by the sensor. On the basis of the reference value, it is thus possible to determine a temperature difference between the temperature before the activation of the drying or hardening reaction and the temperature after the activation of the drying or hardening reaction.
- a temperature increase in the region of the printed image can be detected. This caused by the activation of temperature increase is at least 25-35 ° C, wherein the temperature jump, depending on the color usually in the range of 30 to 45 ° C. On the basis of this temperature rise can be concluded that the degree of activation of the drying or curing reaction.
- the drying and curing device may be an integral part of a printing device or its printing stations for printing on the container or this device may be provided downstream of a printing device or printing station.
- the drying and curing device and the sensor can each be provided in the region of the printing stations of the printing device.
- the printing device can be provided downstream of a drying and curing device, in which the drying of the printed by the upstream printing device container is carried out.
- the drying and curing device is a UV lamp.
- UV radiation is emitted by the UV lamp, by means of which the double bond of photoinitiators in the printing ink or printing ink can be broken.
- the photoinitiators can initiate a drying or curing reaction, which leads to complete crosslinking of the printing ink.
- This drying or hardening reaction initiated by the UV radiation proceeds exothermically, ie heat energy is released, the degree (height) and also the time course of the heating, represents a correlation to the degree of drying and curing of the printing ink or coating liquid.
- the invention further relates to a method for determining the degree of drying of printed containers comprising a peripherally drivable transport element with container treatment stations, wherein the container received at the container treatment stations by the transport element on a self-contained path of movement between at least one container task and at least one container removal are moved, and wherein the Be Daveerbe- treatment stations each associated with at least one drying and curing device, by means of which a drying reaction is effected on the printed container.
- the thermal energy which is emitted by the container subjected to the drying or hardening reaction is detected by means of a sensor.
- the heat radiation of the container surface or parts thereof is detected as a reference value.
- the drying and curing devices cause an exothermic drying or curing reaction on the printed container and the sensor detects the heat energy emitted by the container caused by the exothermic drying reaction.
- the degree of drying of the printed container after completion of the drying reaction is determined on the basis of the heat energy detected by the sensor during the course of an exothermic drying reaction effected by the drying and curing device.
- the degree of drying or curing of the printed container is determined taking into account the temperature of the printed container before initiating the drying or curing reaction.
- Containers according to the invention are for example bottles, cans, tubes, pouches, each made of metal, glass and / or plastic, so for example PET bottles, but also other packaging, especially those suitable for filling liquid or viscous products are.
- one or more sensors are stationary, that is not moved with the respective container or the treatment station circumferentially or in the direction of the transport path, and fixedly arranged next to or above the transport path of the container. This is done in particular downstream of the angular range or the transport path on which the printing takes place in one of the printing modules or at the outlet, for example, the outlet star of the printing modules. Furthermore, it is particularly advantageous in this embodiment to provide one or more sensors directly upstream or downstream of the outlet, for example, the outlet element of that module, which is designed as a drying and curing module.
- the fixed, non-moving arrangement downstream of the final drying or curing of the containers is a suitable location for the sensors and data acquisition esp. In slow moving systems.
- the container surface to be detected by the sensor is moved counter to the transport direction when the container moves past it by its rotation about the vertical axis in order to extend the detection time.
- the sensors can also be provided as part of a downstream inspection module or unit, in which case the heat radiation may already have decreased sharply depending on the climatic boundary conditions and consequently the signal could have already weakened and / or the temperature characteristic could have leveled out ,
- FIG. 1 shows by way of example a device for printing on containers in a schematic plan view
- FIG. 2 shows by way of example a further apparatus for printing on containers in a schematic perspective view
- 3a, b are exemplary treatment stations of a drying apparatus in a schematic plan view
- FIG. 5 shows by way of example a representation of the temperature-time profile (example 1)
- FIG. 6 a, b by way of example representations of temperature-time profiles (example 2)
- the reference numeral 10 shows an apparatus for printing on containers 2, in particular multicolored, on their outer container surface using digital printheads operating on the ink-jet or ink-jet principle.
- the containers 2 are uprighted to the printing apparatus 10 via a feed dog schematically indicated by 1 1 in the figures, i. oriented with its container vertical axis in the vertical direction and supplied in a single-lane container stream, in the direction indicated by the arrow transport direction TR.
- the containers then pass through a container task 5, which is formed for example by a transport star.
- a transport element 3 is shown in FIG Embodiment designed as a machine vertical axis MHA circumferentially driven rotor, in particular continuously circulating driven rotor.
- container treatment stations 4 formed as printing stations 12 are provided at equal angular intervals around this machine vertical axis MHA, each consisting essentially of a container carrier, at least one print head 9 and a drying and curing device 7 for drying and / or Bonding of printing ink or ink exist.
- Each printing station can also have a plurality of print heads 9, for example one for dispensing one color, to produce a multi-color print.
- the container carrier can be designed in particular for hanging support of the container 2 in the region of its container mouth or container opening.
- the containers 2 are printed on the transport path between the container task 5 and the container removal 6 during their movement by the transport element 3.
- the respective container 2 is further rotated about the container vertical axis relative to the print head 9 and thereby printed circumferentially.
- a drying or hardening reaction is initiated or effected on the freshly printed containers, so that the container 2 which has been discharged at the container removal 6 without damaging or impairing it Print image can be removed.
- the drying or curing of the printing ink or printing ink takes place in particular such that the drying and curing device 7 is arranged in the direction of rotation of the container 2 after the print head 9, so that upon rotation of the container 2 about the container vertical axis of the print image 9 applied by the print head is then moved past the drying and curing device 7 and thereby a drying process or activation of a drying reaction can be subjected.
- the sensors 8, as well as the other elements are connected via data links 14.1 with an evaluation unit 13.
- a fixed sensor 8.1 is additionally provided as an acquisition unit and as an optional variant.
- the container 2 of the device 10 are fed via an outer conveyor upright in a transport direction TR and then move within the device 1 on a multiple arcuately deflected transport path. After printing, the containers 2 continue to be fed upright via an external conveyor for further use.
- the device 10 consists of several in the transport direction A directly adjoining modules 10.1 - 10.n, and indeed in the illustrated embodiment of a total of eight modules 10.1 - 10.8.
- all modules 10.1-10.8 are each formed by an identical basic unit, which is equipped with the functional elements necessary for the specific task of the respective module 10.1-10.8.
- Each basic unit includes, inter alia, about a vertical machine axis of the respective module 10.1 - 10.8 circumferentially drivable transport element 3 in the form of a transport or process star with a plurality of shots, which are provided at the periphery of the transport element 3 distributed at equal angular intervals and of which each receptacle for secured receiving each of a container 2 is used.
- the transport elements 3 of the individual modules 10.1 - 10.8 are arranged directly adjacent to each other and counter-rotating, but synchronously driven so that these transport elements 3 in their entirety form a transport device with which the container 2 within the device 1 on a multiply deflected transport path with the Container task 5 at one end of the device 10 and the container removal 6 at the other end of the device 10 are moved.
- the individual containers 2 are preferably forwarded in each case directly from the transport element 3 of a module 10.1 - 10.7 to the transport element 3 of the module 10.2 - 10.8 following in the direction of transport A.
- the function of the individual modules 10.1-10.8 is, for example, the following:
- the module 10.1 forms u.a. the inlet module or the container task 5 of the device 10. In the module 10.1 is carried out but also a pretreatment of the container 2 can take place.
- modules 10.2 - 10.5 form the actual printing modules in which the multiple printing is done, preferably as color printing in the form that each module 10.2 - 10.5 a color set of color printing is printed, for example in yellow, magenta , Cyan and Black.
- the module 10.6 then following in the transport direction TR is designed as a drying and curing module, in which the respective previously generated multiple printing can be effected in a suitable manner, for example by energy input, e.g. is dried by heat and / or by UV radiation.
- the module 10.7 can be designed as an inspection module to which each container 2 passes after drying of the multiple printing and in which the respective multiple print is checked for any errors, so incorrectly printed container 2 are discharged to the module 10.7 or later on the further transport can.
- the module 10.8 forms the outlet module or the container removal of the device 10, on which the finished printed containers 2 leave the device 10.
- the module 10.8 can preferably also be designed as a drying and curing module.
- the containers 2 are rotated around the container vertical axis during their treatment at the individual modules 10. 1 - 10.
- the respective container 2 is rotated about its container vertical axis relative to a print head 9 and thereby printed on the circumference.
- the drying and curing module 10.6 the printing ink or printing ink newly applied by the printing modules 10.2-10.6 is dried or cured by the drying and curing devices 7 provided on the receivers of the transport module, again under Rotation of the container 2 about its container vertical axis relative to the respective drying and curing device. 7
- FIGS. 1 and 2 have in common that following the drying and hardening device 7 in the direction of movement of the container, a sensor 8 is provided by means of which information regarding the effecting of a drying reaction on the printed container can be detected.
- the sensor 8 may in this case be arranged following the drying and curing device 7 in the transport direction TR.
- the sensor 8 is in each case associated with a container treatment station 4, for example a printing station 12 or a drying station of a drying and curing module 10.6, on which the respective drying and curing devices 7 are provided.
- a container treatment station 4 is shown by way of example.
- the container treatment station 4 can be a printing station 12 according to the printing apparatus 10 of FIG. 1 (print head 9 is not shown) or, ideally, a drying station (module 10.6) according to the exemplary embodiment according to FIG.
- the container 2 provided at the container treatment station 4 is fixed by suitable holding means and can be rotated about its container vertical axis in the direction of rotation DR indicated by the arrow.
- the holding means may in particular cause a clamping of the container 2, for example between a container bottom and a container top, or a hanging support in the region of the container mouth.
- the drying and curing device 7 may in particular be a UV light source. As a result of the action of the drying and curing device 7 on the printed image, this printed image is subjected to a drying or hardening reaction or such a drying reaction is triggered.
- the sensor 8 may in particular be a heat-detecting sensor 8, for example an infrared sensor.
- the sensor 8 is designed, in particular, to determine the heat energy which is emitted by the container 2 subjected to the drying reaction. In particular, the sensor is designed to determine the absolute temperature of printed image areas.
- At least one heat-detecting sensor 8 is ideally arranged in the region of the treatment stations 4 of the container 2 on a drying and curing module 10.6 and is moved along with them in the transport direction TR. Such an arrangement is also shown in FIG. 3b.
- Two are provided as UV light sources as drying and curing devices 7 and the thermal sensor 8 is arranged between these UV light sources.
- an IR sensor and UV light sources gem. Examples 1 or 2 are used.
- the invention is based on the finding that heat energy is released in the drying reaction of the printing ink or printing ink, by chemical reactions during the drying reaction.
- This reaction takes place as a kind of chain reaction, which continues even after the action of radiation, in particular UV radiation, so that the quality of the drying and curing processes can be reliably recorded and evaluated even downstream.
- the senor 8 has a focusing or a very narrow detection range, so that the heat radiated from the container 2 heat can be detected accurately. This ensures that almost exclusively heat energy or infrared radiation emitted by the container 2 is detected by the sensor 8 and that infrared radiation emitted outside the reception range does not cause a falsification of the measurement signal.
- the sensor for detecting the radiated heat energy in the millisecond range for example in the range between 50ms and 1 ms, preferably in a range less than 10ms, esp. From 2ms to 6ms formed, so at the passing of the print image on the sensor 8, a plurality of measured values can be recorded at different points of the print image, and thus different degrees of drying in different print image areas are tangible.
- the detection of the effect of a drying reaction in different image areas is therefore particularly necessary because it has been shown that the curing at different points in the print image can have different degrees of cure.
- the uniform action of the drying and curing device 7 on the entire printed image in the case of printed image areas with white printing ink leads to less hardening than with the remaining colors, since the UV light emitted by the drying and curing device 7 is reflected more strongly by the white printing ink or printing ink than in the other colors.
- the sensor 8 is coupled to an evaluation unit 13.
- measured values detected by the sensor 8 can be forwarded to the evaluation unit 13 and analyzed or evaluated there.
- the evaluation unit 13 it is possible by the evaluation unit 13 to determine the degree of activation of the drying reaction or curing reaction, which was caused by the drying and curing device 7.
- the evaluation unit 13 may also be coupled to the drying and curing device 7, so that the performance of the drying and curing device 7, in particular the energy of the radiated UV radiation depending on the detected degree of activation of the curing reaction can be controlled.
- an increase in performance of the drying and curing device 7 is effected.
- FIG 4 An alternative embodiment is shown in Figure 4, in which the container 2 are printed on one or more printing modules, with only one module 10.5 is shown. Downstream of the module 10.5, a module 10.6 is provided as an independent drying and curing module on which the containers 2 during transport in the transport direction TR in the angular range B by means not shown radiators, ideally one or more UV lamps, a final drying and / or curing process be subjected to curing of the printing ink.
- one or two fixed, non-rotating sensors 8.1 and 8.2 are provided in the present example, for example. IR sensors.
- these are arranged at different vertical altitudes, for the use of two inspection windows (measuring spots) via which the container surface is detected thermosensory.
- the sensors 8.1 and 8.2 are connected to the evaluation unit 13, wherein the data connections in this embodiment as well as for each of the other embodiments may be formed as any suitable wired or wireless transmission system, which is a sufficiently fast and secure Data transmission allows.
- a module 10.7 Downstream of the drying and curing module (module 10.6), a module 10.7 is provided for inspection of the container 2, followed by a discharge device 15 for defective containers 2 in the transport direction TR, so that they via discharge line 16 from the main stream of the container 2 in a known manner and Way separates and can be derived.
- the module 10.7 and the discharge device 15 are also connected via data links 14.4 and 14.5 with the evaluation device 13 and / or another central control unit.
- another fixed, ie non-rotating, sensor 8.3 is provided in the exemplary embodiment according to FIG.
- the sensor 8.3 is also connected to the evaluation unit 13 via a data connections 14.3.
- This optional sensor 8.3 could already detect and monitor the heat radiation of the container surface or the printed image, which results from a pre-drying and / or partial drying or the so-called pinning process, which is carried out immediately after printing on the module 10.5.
- the measured values of the sensors 8.1, 8.2 and those of the upstream sensor 8.3 can be evaluated jointly.
- a reference measured value in particular a reference temperature measured value, which corresponds to the temperature of the container 2 before the activation of the drying and curing device 7, is preferably determined.
- a temperature difference between the temperature of the printed image, which has passed through the drying and curing device 7 and the temperature of the container before the activation of the drying reaction or the evaluation of the printed image can be determined. This temperature difference gives an immediate indication of the degree of activation of the drying reaction or the curing reaction and thus the drying or curing of the printed image after the drying or curing reaction has ended.
- FIGS. 5 and 6a, 6b show the measured values, as measured with two different IR sensors, in a design which corresponds to that in FIG. 3b with only one sensor 8.
- an IR sensor Type 1 was used which has the following performance data.
- a single-color printed image was applied in a single-pass process and the UV-curable ink was subjected to a max. 800ms (in the present 792ms) subjected to continuous drying and curing.
- the detection with the IR sensor type 1 was carried out in parallel for at least 3.3 ms per degree angle with active UV lamps. In doing so, 360 ° of the container surface to be inspected were transported to the stationary IR sensor Tpy1.
- the temperature curve C illustrated in FIG. 5 essentially shows two significant curve sections 100 and 200, which can be discreetly distinguished from one another by the choice of the type 1 sensor with a very fast and scalable analog output and real-time data processing.
- the curve section 200 is the detection area of the print image on the container surface, ie the curve and measuring area of interest.
- the curve section 100 is the course of the heat radiation of print heads of adjacent modules, which reach the detection area of the highly sensitive sensor.
- each surface has its own characteristic curve for the 360 °, in this case esp.
- time duration of sections of individual temperature levels and Peek characteristic that can be uniquely determined and assigned in real time via the evaluation unit 13.
- the particular advantage of the device and the method is that the temperature and thus the drying and curing quality can be reliably determined and evaluated in real time for each angular degree of the container surface, without any restrictions on the transport speed and thus the performance of the entire system.
- the starting temperature of the surface was recorded before the drying and curing treatment and the data was adjusted accordingly.
- FIGS. 6a and 6b show temperature profiles in accordance with Example 2, wherein an IR sensor Type 2, which has the following performance data and is distinguished from the IR sensor Type 1, in particular by a faster detection speed, was used:
- FIG. 6a shows, analogously to FIG. 5, the temperature profile over time on the container surface during the detection by the IR sensor according to type 2.
- FIGS. 6a and 6b the angle positions from 0 ° to 360 ° of the container, which appears as a zigzag curve (curve D) due to the fixed rotational speed of the containers, are additionally plotted on the Y axis.
- the Type 2 sensor is even more responsive compared to the Type 1 sensor and reaches 90% of the output signal after just 6ms.
- curve C of FIG. 6a With a substantially identical test setup for example 1, a still discrete temperature profile of the printed image and a much more exact determination of the temperature level can now be achieved.
- a type 1 sensor is particularly suitable for detecting the fundamental presence of the printed image and also the basically successful sequence of the drying and curing process. If, in addition, a quantifiable statement about the quality of the drying and curing process is to be made, it is advisable to provide a Type 2 sensor with a very short settling time of less than 10ms to establish 90% of the output signal.
- thermographic detection of the container surface can take place in a single pass by rotating the surface of the container in one of the sensors 8 360 ° in front of this sensor 8 and in the use of two UV lamps acc.
- Figure 3b by 360 ° plus the angular distance between the two emitters so that both UV emitters and the respective radiation effect are detected.
- thermographic values only at discrete angle values or ranges of the container surface. This can be particularly advantageous when containers are printed only in narrow angular ranges.
- the invention has been described above by embodiments for rotating transport and treatment devices. It is understood that the sensors and the monitoring process can also be used advantageously in linear transport and treatment devices, even in systems that operate in stepping mode.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Printing Methods (AREA)
- Ink Jet (AREA)
- Auxiliary Devices For And Details Of Packaging Control (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102014103407.4A DE102014103407A1 (de) | 2014-03-13 | 2014-03-13 | Vorrichtung und Verfahren zum Trocknen von bedruckten Behältern |
| PCT/EP2015/055162 WO2015136033A1 (de) | 2014-03-13 | 2015-03-12 | Vorrichtung und verfahren zum trocknen von bedruckten behältern |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3116718A1 true EP3116718A1 (de) | 2017-01-18 |
| EP3116718B1 EP3116718B1 (de) | 2020-02-26 |
Family
ID=52823597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP15712547.7A Active EP3116718B1 (de) | 2014-03-13 | 2015-03-12 | Vorrichtung und verfahren zum trocknen von bedruckten behältern |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US9662905B2 (de) |
| EP (1) | EP3116718B1 (de) |
| DE (1) | DE102014103407A1 (de) |
| WO (1) | WO2015136033A1 (de) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018065307A (ja) * | 2016-10-20 | 2018-04-26 | 株式会社ミマキエンジニアリング | 印刷装置及び印刷方法 |
| DE102017111066A1 (de) * | 2017-05-22 | 2018-11-22 | Khs Gmbh | Verfahren zur Überwachung eines Prozesses |
| US10710377B2 (en) * | 2017-09-22 | 2020-07-14 | Xerox Corporation | System and method for producing an image on an article |
| DE102022123022A1 (de) * | 2022-09-09 | 2024-03-14 | Krones Aktiengesellschaft | Direktdruckvorrichtung mit UV-Leuchtvorrichtung |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030236350A1 (en) | 2002-06-21 | 2003-12-25 | General Electric Company | Impact-modified compositions |
| DE102007036752A1 (de) * | 2007-08-03 | 2009-02-05 | Khs Ag | Vorrichtung zum Bedrucken von Behältern |
| KR101153104B1 (ko) * | 2007-08-03 | 2012-06-04 | 케이에이치에스 게엠베하 | 용기에 인쇄를 하기 위한 장치 및 방법 |
| DE102008049241A1 (de) * | 2008-09-26 | 2010-04-08 | Khs Ag | Vorrichtung zum Aufbringen jeweils eines Mehrfachdrucks auf Packmittel |
| JP5317780B2 (ja) * | 2009-03-17 | 2013-10-16 | ローランドディー.ジー.株式会社 | インクジェット式記録装置 |
| DE102010062144B4 (de) * | 2010-11-29 | 2015-11-12 | Koenig & Bauer Ag | Druckmaschine mit mindestens einem einen Heißlufttrockner aufweisenden Trocknersystem sowie Verfahren zum Betreiben eines einen Heißlufttrockner aufweisenden Trocknersystems |
| JP6254526B2 (ja) * | 2011-09-02 | 2017-12-27 | カーハーエス・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | パッケージング手段を処理するための装置及びこのような装置において使用するためのプリントセグメント |
| JP2013180424A (ja) * | 2012-02-29 | 2013-09-12 | Fujifilm Corp | インクジェット記録装置及びインクジェット記録方法 |
| US9067436B2 (en) | 2012-06-29 | 2015-06-30 | Xerox Corporation | Method and apparatus for determining a degree of cure in an ultraviolet printing system |
| DK177499B1 (en) * | 2012-09-26 | 2013-07-29 | Othonia Curing Technology Aps | COMPUTER-CONTROLLED UV-LED Curing Apparatus |
-
2014
- 2014-03-13 DE DE102014103407.4A patent/DE102014103407A1/de not_active Withdrawn
-
2015
- 2015-03-12 WO PCT/EP2015/055162 patent/WO2015136033A1/de not_active Ceased
- 2015-03-12 EP EP15712547.7A patent/EP3116718B1/de active Active
- 2015-03-12 US US15/125,669 patent/US9662905B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE102014103407A1 (de) | 2015-09-17 |
| US9662905B2 (en) | 2017-05-30 |
| EP3116718B1 (de) | 2020-02-26 |
| US20170001450A1 (en) | 2017-01-05 |
| WO2015136033A1 (de) | 2015-09-17 |
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