CN110497697A - Method for preventing misprint in water-based ink printing - Google Patents
Method for preventing misprint in water-based ink printing Download PDFInfo
- Publication number
- CN110497697A CN110497697A CN201910418701.XA CN201910418701A CN110497697A CN 110497697 A CN110497697 A CN 110497697A CN 201910418701 A CN201910418701 A CN 201910418701A CN 110497697 A CN110497697 A CN 110497697A
- Authority
- CN
- China
- Prior art keywords
- test pattern
- disk
- page
- ink
- filling
- 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.)
- Pending
Links
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
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/21—Ink jet for multi-colour printing
- B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
- B41J2/2135—Alignment of dots
-
- 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
-
- 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
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04558—Control methods or devices therefor, e.g. driver circuits, control circuits detecting presence or properties of a dot on paper
-
- 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
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/21—Ink jet for multi-colour printing
- B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
- B41J2/2146—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding for line print heads
Landscapes
- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Ink Jet (AREA)
- Accessory Devices And Overall Control Thereof (AREA)
Abstract
The present invention relates to a kind of methods for preventing misprint in water-based ink printing, comprising: calibrates multiple video cameras；First test pattern of the disk with filling is provided；Test pull is generated with the first test pattern of water-based ink printing by multiple ink jet printing heads during the first round of printable fabric page is by ink-jet printer；During the first round time, by the disk of the filling of camera shooting the first test pattern of machine testing, the first reference picture is generated；Or based on for the first reference picture of generation of data provided by the first test pattern；The printable fabric page with test pull is stored until adapting to environment；By the disk of the filling of camera shooting the first test pattern of machine testing during the second round of printable fabric page is by ink-jet printer, the second reference picture is generated；Based on the first reference picture compared with the second reference picture, printing image compensation is calculated in a manner of computer supported.The interference that the present invention is advantageously able to achieve reply printable fabric is shunk.
Description
Technical field
The present invention relates to a kind of methods with claim 1 feature as described in the preamble.
Background technique
The present invention is based on graphics industry technical fields, and are especially industrial inkjet printing (InkJet) herein and arrive plane base
Field on bottom, that is: on the printable fabric for liquid ink being applied and being dried to page or web form, the printable fabric is excellent
Choosing is made of paper, thick Paper or cardboard.
The application of liquid ink with known DOD (Drop-on-demand, drop-on-demand) ink jet printing method realization,
Mode is that printing image is generated on plane printable fabric, wherein by the ink jet printing head (letter for the nozzle that can individually control
Claim: print head) the extremely fine ink droplet being preferably within the scope of picoliters is generated according to the image to be printed, and these are black
Drop is transmitted on printable fabric as printing points in a contactless manner.This control of nozzle can be by piezo actuator reality
It is existing.
In so-called water-based ink printing, liquid ink includes the water proportion for receiving toner (especially pigment).
Toner is transmitted on printable fabric by means of the ink droplet as caused by ink gun.Then by the water equally transmitted at this again from holding
It prints material to remove, preferably passes through heated drying, such as the irradiation for passing through infra-red radiation.
Since water enters in printable fabric (especially paper, cardboard or ground paper) with printing technology relatedly, or pass through
Other modes reach the moisture (such as the received air humidity of institute) in printable fabric, may result in perceiving for printable fabric
(face) extend (Ausdehnung).When printable fabric is then dried (such as actively dry by means of infra-red radiation
Dry period and/or by store passively dry during), it is also possible to cause same appreciable (face) of printable fabric to shrink
(Schrumpfen).Variation caused by both (individually or collectively) all may be when the manufacture and print for printing product post-process
It throws into question, this is because the geometry of printed matter is no longer consistent with specified geometry.
In the prior art therefore it is possible that following problem, it may be assumed that the contraction of especially printable fabric (substrate) can be done
It influences printing process and/or print last handling process with disturbing, and reduces the quality of printing product generated.Moreover, once again
Extension (Wiederausdehnen) can may also intrusively act on.Furthermore these interference are not linear, that is: these interference
It is not to lead to geometry linear change.
It is wrong that document DE19724066B4 discloses a kind of geometry when communicating information on printable fabric for correcting
Method accidentally.These mistakes are by due to caused by causing printable fabric to extend and introducing moisture.Such as measurement can be passed through
Trapezoidal distortion (Trapezverzerrung) is sought out with reference to the label on printed matter out.However this amendment is in film, print
It is carried out when version and printing cylinder exposure, that is, is not suitable for ink jet printing.
Document DE10110640A1 equally discloses a kind of modified method of the exposure for stamp, and namely same not applicable
In ink jet printing.Here, precomputing revised data, this also includes the distortion measured in printing image, such as by means of
Help vernier or standardized component.
Document DE102014013370A1 disclose it is a kind of for in ink jet printing to web when part it is inaccurate to version
The method that property compensates, wherein ink is dried by ultraviolet radioactive.Herein relate to the method based on model.
The German patent application (hereinafter referred to as " file D1 ") of also undocumented document number DE102017219946.6
A kind of method for preventing the misprint in ink jet printing is disclosed, is included the following steps: in the printable fabric page first round
Secondary (Durchlauf) prints out the first test pattern during passing through ink-jet printer, wherein generates test pull
(Testdruck)；The first test pattern is detected during the first round time, wherein generate the first reference picture；It stores (Lagern)
Printable fabric page with test pull is until adapt to environment (Akklimatisierung)；It is taken turns in printable fabric page second
The first test pattern is detected during secondary process ink-jet printer, wherein generates the second reference picture；Based on the first reference picture with
The comparison of second reference picture calculates printing image compensation (Druckbild- in a manner of computer supported
Kompensation)。
German patent application (hereinafter referred to as " the file of equally also undocumented document number DE102017216041.1
D2 ") a kind of method for being automated calibration camera using test pattern is disclosed, these test patterns include the circle of filling
Disk.In this application, in multiple places all referring to this file D2, especially with regard to camera calibration methods and about filling
Disk detection in terms of.Thus the content of file D2 is also brought into the application.
Summary of the invention
Therefore, the task of the present invention is to provide the scheme that one kind makes moderate progress compared with the prior art, the program is special
It is to be able to achieve: by simple achievable measure (especially by existing means) reply printable fabric in the system for printing product
It makes and the interference printed when post-processing possible when necessary is shunk.
Solution according to the invention:
The task is according to the present invention by being addressed according to the method for claim 1.The present invention is advantageous in turn
Preferred improvement project is generated by dependent claims and the description and the appended drawings.
Alphanumeric (the a00 to e4) of method and step is directed to employed in claim, the description and the appended drawings
It is preferred that providing the sequence of these method and steps, wherein natural to execute all method and steps.
Printable fabric according to the invention may include: paper, cardboard, ground paper (also referred to as ripple ground paper) or textile, respectively
From as page.When printing three-dimensional body (such as sphere or cylinder), printable fabric also can have curved surface.
Method according to the invention for preventing the misprint in water-based ink printing includes the following steps:
Calibrate multiple video cameras；
(step a0) first test pattern of the disk with filling is provided；
By multiple ink jet printing heads with water base oil during printable fabric page the first round a is by ink-jet printer
The first test pattern of ink print (step a1), wherein generate test pull；
The first round (by the disk of the filling of camera shooting machine testing (step a2) first test pattern during step a),
Wherein, the first reference picture is generated；Or-based on for the first reference picture of generation of data provided by the first test pattern；
(printable fabric page of the step b) with test pull is until adapting to environment for storage；
By camera shooting machine testing (step d1) first during printable fabric page the second round d is by ink-jet printer
The disk of the filling of test pattern, wherein generate the second reference picture；And
Based on the first reference picture compared with the second reference picture, (step e) print is calculated in a manner of computer supported
The printing image that brush image compensation or calculating have been compensated for.
The present invention is advantageously able to achieve: by simple achievable measure, particularly by (such as the ink-jet of existing means
Print head, video camera, computer) reply printable fabric print product manufacture and when necessary it is possible print post-processing when
Interference is shunk and it is also preferable to include interference (because what not pure compensation ground moved towards) to extend once again.It is particularly advantageous herein
It is, it is existing in the machine to image function with additional function for the present invention.Preferably may be used for computer of the invention
To be the already existing computer of equipment control device.
The present invention is by ink-jet printer, particularly (line formula) video camera of its high precision for detecting test pattern.Cause
This does not need these test pulls being placed in separately independent scanner and be scanned by it.Especially in the print of large-scale page specification
In brush, to these test pulls, (" intraconnected ") detection is advantageous in the machine.
The present invention is important and is in disclosed heretofore unknown step in the prior art: before the second round
(in time) page is stored, it may be assumed that page is taken care of into one section of determining (preferably fixing) time interval.In this regard, to a variety of
Learn in the numerous studies of different printable fabrics: there are various printable fabrics, these printable fabrics are not very short
Only terminate after time but just this very important geometry distortion (shrink, extend) after several hours
Process.It can be advantageously ensured by storing page before the second round according to the present invention: be detected in the second round
The page of geometric warping is terminated.This step describes in also undocumented file D1.
Page is saved until adapting to environment, this may continue only a few minutes, but may also continue several hours.If
A few minutes (such as 2 to 5 minutes) just enough if, then this preservation of page can be used as page from collector to feeder
TranshipmentIt realizes.
The present invention can also be carried out alternatively by multiple test pages, it may be assumed that the method according to the invention can be for the
One round is carried out by each one new page in multiple times.It is possible thereby to realize higher precision.The present invention can iteratively be held herein
Row.
The present invention alternatively can be used for wet type offset printing, wherein moisture passes through wetting agent and/or wetting agent-printing face
Material-emulsion reaches in printable fabric.
In addition, according to the invention focus on, test pattern includes the disk of filling, and these disks (or thus
The reference picture of generation) for being calculated in a manner of computer supported compared with the second reference picture based on the first reference picture
Image compensation is printed out or calculates the printing image having been compensated for.Such disk and its detection show and retouch in file D2
State, thus it referred to, with particular reference to file D2 Fig. 3 together with affiliated description.
Preferred calibration method for calibrating multiple video cameras (ink-jet printer) is the disclosed calibration according to file D2
Thus method refers to it.Single camera image can be led together through in calibration and be related to entire printable fabric
The analysis of page is handled.It can be realized direction lateral along printable fabric conveying direction and therewith in this way and be in 10
Precision in micron range.The disk of filling shows in a large amount of tests: even if under bad printing condition, it also can be non-
It is often good and detect without error." filling " especially indicates for disk: disc is preferably completely filled with ink (tool
Or without grid be all it is feasible, do not have grid preferably).
Based on the first reference picture is generated for data (especially printed data) provided by the first test pattern, this is excellent
Choosing is realized in a manner of computer supported.First reference picture can be consistent with the first test pattern, that is: generate the first test
Pattern, this, which may is that, provides the first test pattern as the first reference picture.
The present invention cannot be only used for ink jet printing (InkJet), and especially can also be used for offset printing.Here, instead of
In by disk printed by ink, detection and analysis processing is carried out to by disk printed by offset printing pigment.
The feature of advantageous modification of the invention can be following steps: to printable fabric page with the second test chart
Case carries out gloss varnish a4.
The feature of advantageous modification of the invention can be following steps: by the printable fabric page with test pull
It opens in ink-jet printer external storage b until adapting to steric requirements (especially environment temperature and/or ambient humidity).
The feature of advantageous modification of the invention can be following steps: by the printable fabric page with test pull
Zhang Cunfang b time period t, wherein t > 1 minute, t > 1 hour or t > 3 hours or t > 24 hours.
The feature of advantageous modification of the invention can be following steps: a3 is dried to printable fabric page,
Especially heated drying or infra-red drying.
The feature of advantageous modification of the invention can be following steps: printable fabric page is directed to the second round
Again feed c, especially with the same orientation in the first round.
The feature of advantageous modification of the invention can be following steps: tested with second printable fabric page
On pattern in the case where gloss varnish a4: detecting the second test pattern of d2 during the second round, wherein generate the second reference picture.
The feature of advantageous modification of the invention can be following steps: tested with second printable fabric page
On pattern in the case where gloss varnish a4: compared in a manner of computer supported the second test pattern in the second reference picture of e11 with
The first test pattern in second reference picture；The first test pattern of e12 and the second test are calculated in a manner of computer supported
Difference between pattern；Based on the calculated difference of institute, by ' ink figure adaptation e13 to be printed of gloss varnish image 13 to be printed
Picture.
The feature of advantageous modification of the invention can be following steps: compare e21 in a manner of computer supported
The first test pattern in the first test pattern and the first reference picture in second reference picture；In a manner of computer supported
Calculate the difference between the first test pattern of e22 and the second test pattern；Based on difference calculated, by ink figure to be printed
As and optional gloss varnish image adaptation e23 to be printed cross cutting image to be die cut.
The feature of advantageous modification of the invention can be following steps: the ink figure being adapted to using at least one
As (and the gloss varnish image being also adapted in the case where upper gloss varnish a4 using at least one) printing f, at least one printing is appointed
Business.
The feature of advantageous modification of the invention can be following steps: provide the disk with filling first is surveyed
Attempt case, wherein these disks at least two rows (Zeilen) transverse to printable fabric page conveying direction be arranged.
The feature of advantageous modification of the invention can be following steps: provide the disk with filling first is surveyed
Attempt case, wherein these disks at least two column (Spalten) be parallel to printable fabric page conveying direction be arranged.
The feature of advantageous modification of the invention can be following steps: provide the disk with filling first is surveyed
Attempt case, wherein these disks are with four rows and four column settings.
The feature of advantageous modification of the invention can be following steps: provide the disk with filling first is surveyed
Attempt case, wherein the diameter of the disk of filling is 50 to 150 printing points (especially such as 100 printing points).50 to 150
A printing points are demonstrate,proved in the case where such as 1200dpi printed resolution and, for example, 670dpi resolution of video camera in testing
Bright is to be suitble to.The disk of filling may include such as about 2.2 millimeters of diameter.The feature of advantageous modification of the invention
Can be following steps: the first test pattern of the disk with filling is provided, wherein disks of these fillings have 30 to
The diameter of 80 camera pixels.
The feature of advantageous modification of the invention can be following steps: respectively by these video cameras in the first round
Secondary period detects the disk of the filling of the first test pattern and filling that the first test pattern is detected during the second round
Disk, wherein each camera shooting machine testing one arranges.
The feature of advantageous modification of the invention can be following steps: calibrate multiple video cameras, wherein to calculate
The mode that machine is supported realizes the coordinate transform of (or calculating) between camera coordinates and print head coordinate.
The feature of improvement project and the embodiment of the present invention of the invention, of the invention also becomes of the invention mutual group any
The favourable improvement scheme of conjunction.Furthermore improvement project of the invention can have in " technical field " " background technique " " summary of the invention "
Above-mentioned part disclosed in single feature or feature combination.
Detailed description of the invention
The present invention and its advantageous modification are further described according to preferred embodiment hereinafter with reference to attached drawing.It is mutually right
The feature answered is equipped with same reference numerals in the accompanying drawings.
Attached drawing is shown:
Fig. 1: the method according to the invention executes machine according to the invention when this method；
Fig. 2: according to the schematic construction of test pattern of the present invention；
Fig. 3 a-e: the calculating according to the invention of the characteristic parameter of page deformation；
Fig. 4: the difference vector image calculated according to the present invention.
Specific embodiment
Fig. 1 shows the preferred embodiment of the method according to the invention or executes machine according to the invention when this method.
Ink-jet printer 1 for printing according to the present invention to page 2 is preferably included such as lower component:
Receptacle 3 for page 2: can store single page in receptacle 3, or deposit side by side or as stacking
Put multiple pages.Receptacle 3 can be lodging bench or storing board.Receptacle 3 can be a part of machine 1, or with the machine
Device 1 is separately set.Receptacle 3 is also possible to the collector of machine 1, or from collector to the path of feeder.
Pass through the transport path 4 of printing machine 1: the path 4 can include (as transportation system) roller sequence, conveyer belt,
Gripping apparatus chain or pallet sequence.
Receptacle 3 can be manually conveyed to the transport path 5 of receptacle 3: page 2.Conveying can be alternatively equipped with
System (referring to path 4).
Machine 1 can be manually conveyed to the transport path 6 of printing machine 1: page 2.Delivery system can be alternatively equipped with
It unites in (referring to path 4).
One/multiple ink jet printing heads 7: page width formula is printed, it can be by multiple print heads 7 abreast and transverse to defeated
The direction in path 4 is sent to be arranged.For polychrome printing, multiple print heads 7 can be successively arranged along the direction of transport path 4.
These print heads 7 print image 13 according to (number) and generate multiple ink droplets being made of water-based inks 7a, and pass through this side
Image 7b is printed onto page 2 by formula.It can be by the first test pattern 16 (by water base oil by one or more of print heads 7
Ink is constituted) it is applied in page 2.
Video camera 8: by image 7b caused by print head 7 (especially the first test pattern 16) by video camera 8 at it
It is at least partly detected in corresponding search coverage 8a and is directed to computer 12 as (number) first reference picture 17.Again
Person, these video cameras 8 also can detecte out 19 (see below) of the second reference picture and are directed to computer 12.These video cameras
8 also may be constructed camera chain and include for example two, three or four video cameras transverse to the direction of transport path 4.
Selectable alternative camera position 8 ': video camera 8 also can be set at ' the place of position 8.Alternatively, it second takes the photograph
Camera 8 can be set at ' the place of position 8.
Infrared dryer 9: water-based inks 7a in page 2 by means of infrared dryer 9 (or pass through it and radiate 9a) extremely
Partially dry.Here, water is removed from ink and/or from page 2 by evaporating.Vapor, which is guided, (such as to be inhaled
It walks).
Selectable upper gloss varnish unit 10: image 7b can be by (preferably clear) the gloss varnish 10a of upper gloss varnish unit 10
It at least partly covers, and is able to protect in this way or purificationization (veredelt).If be related to numerically bright
Oil machine group (such as print head), then gloss varnish ' is applied according to (number) gloss varnish image 13.If be related to traditional upper
Gloss varnish unit, then being equipped with such as gloss varnish version (preferably aniline version).Gloss varnish version can according to (number) gloss varnish image 13 ' generate,
Such as the aniline version accordingly exposed.Second test pattern (being made of gloss varnish) can be applied to by upper gloss varnish unit 10
In page 2 and/or on image 7b and/or on the first test pattern 16.
Selectable cross cutting unit 11: the page 2 printed can be by means of at least one die cutter of cross cutting unit 11
Has 11a cross cutting.Cross cutting unit 11 can be preferably rotary cutting part or platform-type cutting part.It 11 ' indicates: cross cutting by a dotted line
Unit 11 can also separately be set relative to machine 1.Being die cut image 13 " can be at digital die cutting (such as laser die cutting)
In the case where exist in digital form, however be preferably directed to the conventional cutting part with mold cutter, that is: cross cutting image with
The location and shape of mold cutter are realized.
Computer 12: the computer 12 can be a part of machine 1, or disconnects and independently set.Computer
12 connect via interconnecting piece 15 (such as data circuit) with the different component of machine 1 for data transmission.Computer 12 is special
Be can execute the calibration of multiple video cameras 8, and/or calculate, storage and providing for printing f has been compensated for (that is, avoids
Misprint) printing image 14.
The method according to the invention is hereinafter according to (part is optional) method and step a00 to e23 description, these methods
Step can be carried out by machine 1 previously with respect to (same part is optional) component described in Fig. 1:
Calibrate (step a00；Before step a and a0) multiple video cameras (or the video camera being made of multiple video cameras
System): optionally the camera chain 8 in calibrating inkjet printing machine 1 (such as take the photograph by four lines with each 7300 pixel first
Camera), that is: specific test pattern 16 is used, coordinate transform and correcting function are calculated, this function allows for printing picture
(hereinafter referred to as " converting ") is calculated back and forth between plain coordinate and camera coordinates.For determining the preferred method of transformation in text
It describes in part D2, it is referred to especially with regard to transformation aspect.This method is based on following reason and is advantageous: a) high-precision
Degree, that is: this transformation can be with less than half printed pixels (in the case where 1200dpi printed resolution about 10 μm)
Error is implemented；And it b) can simply be executed by operator.This transformation can be used for printable fabric page 2 or its printing figure
Sample (in particular according to the test pattern of Fig. 4 or file D2).The transformation for having generally allowed for single camera image mutual.
A) first round on transport path 4 of page 2 passes through ink-jet printer 1.
A0) first test pattern 16 of the disk 21 with filling is provided.To this referring also to Fig. 2.
A1) the first test pattern 16 is printed onto page 2 by ink (ink test pattern).Print page to be checked
2 are opened, and these pages 2 are discharged on the suitable position of machine 1.Thus, it is preferred to use the test pattern specially researched and developed
16, which includes the grid (referring to fig. 2) being distributed as broadly as possible composed by preferably 4 × 4 disks 21.These circles
Disk 21 prints in the non-printing zone 50 for the page 2 that face formula is printed preferably by black ink.These disks 21 are preferred herein
So set, making their position over to the range as big as possible of page 2.These disks 21 are further preferably so set herein
It sets, so that these disks 21 are located at the coverage referring to each video camera 8 (being four video cameras in the figure 2 example) as far as possible
Center.There have been the undesirable deformations of page during printing after the printing or.
A2 the disk 21 of the filling of the first test pattern 16) is detected by video camera 8.Here, the first reference picture of shooting
17, and it is transferred to computer 12.Can alternatively save this detection, and by provided test pattern 16 or
Data image generated based on the test pattern 16 can be used as the first reference picture 17 in computer 12.
A3) the ink 7a for selectively (forming the first test pattern 16) in dry (especially heated drying) page 2.It is this
The dry interference that may result in page 2 and then undesirable contraction.If page is protected in its front seamed edge during conveying
It holds, it would be possible that enough will lead to trapezoidal distortion, wherein page trailing edge is more strongly shunk than page front seamed edge.
A4 at least one section of page 2 or page 2 optionally) is gone up into gloss varnish, wherein produce (preferably in page 2
It is provided) the second test pattern 18 (gloss varnish test pattern) (referring to fig. 2).
In the first round a, it is not die cut page.(if if being equipped with) is die cut only under production conditions (that is, first
After round a and the second round b) it carries out.
B) storage (or keeping) page 2 in (page) receptacle 3, such as from the page collector of machine 1 to page
The form stacked during the transfer of feeder with collector, or in separately independent receptacle.Store the duration herein
It is preferred that so selection, so that page adapts to environment, that is, until adaptation steric requirements (temperature and humidity of surrounding air) is
Only.The storage duration can be a few minutes or be greater than one hour.This storage of page will lead to the page shunk before this
(again) extend.Here, page may maintain trapezoidal distortion (even if with lesser extent).The storage of page 2 is thus preferred
In limited conditions realize: immediately in by page 2 from machine 1 export after: page 2 is stored to restriction in limited conditions
Elapsed time between post-processing is being printed and printed to time when simulating production printing product.
C) page 2 is fed into (Anlegen) again for the second round d.Here, page 2 or test pattern 16 (and
There are also the second test patterns 18 in the case where upper gloss varnish) to be fed with orientation identical in the first round a, it does not rotate especially
180°。
D) page 2 passes through ink-jet printer 1 on transport path 4 with the second round d.The page that will be deformed due to contraction
2 are directed through machine 1 again, wherein without printing, but the image of page 2 are recorded by the video camera of machine 18.These
Page 2 slightly may movably and/or rotatably pass through machine due to orientation error in the second round d.
D1 the first test pattern 16 for) shrinking by the detection of video camera 8 and at least partly extending again due to storing b before this
Filling disk 21.Here, shooting the second reference picture 19 and sending computer 12 to.
Herein, it is preferable that separated by the method for sub-pixel accurate (sub-pixelgenauen) for each video camera 8
Independently seek out the disk 21 printed in camera coordinates in a manner of computer supported required by taking-up central coordinate,
It is preferred that the method for the disk according to corresponding (as described in file D2) for detecting filling, can refer to file to this
D2。
The single result of multiple video cameras 8 is merged: at this point, all circle center points in camera pixel coordinate
It is (excellent that (central coordinate of the disk 21 printed sought out) by means of transformation (referring to step a00) is converted into printed pixels
Needle selection to each video camera 8 separately).Herein also to the distortion caused by camera optics system and due to taking the photograph
Other torsions caused by not faultless assembly/adjustment (such as fault orientation and/or torsion of different cameras) of camera 8
Song compensates, and all the points of all video cameras 8 are directed to fixed, common frame of reference (" DruckDots ").
Transformation is preferred for as a result: these video cameras individually being measured and are associated with each other.Preferably, all video cameras 8 are (with machinery side
Formula) so it is connected with each other, so that each interval holding of these video cameras 8 each other is constant.
Page orientation is modified when detecting: at this point, for each page 2 detected, being existed: frame of reference
The data group of the circle center point (central coordinate of the required taking-up of the disk 21 printed) of required taking-up in " DruckDots "
(actual value), and the provided reference data set (rated value) of the ideal circle center point of disk 21 printed.This
Reference data set can be obtained or thing being detected in a manner of camcorder technology and being generated in a manner of computing technique
First obtained based on provided printed data.The two data groups are oriented each other first, mode is, such as by minimum
Square law fitting (Least-Squares Fit) is determined referring to the rotation (parameter) and movement optimized for this orientation
(two parameters).It is possible inaccurate when passing through machine 1 to curvature as a result, and when page 2 is fed for the second round d
Property compensates.
D2) in the case where upper gloss varnish: also detecting the second test pattern 18 to extend due to storage b by video camera 8.
In this case, the second reference picture 19 then also relates to the second test pattern.Because upper gloss varnish d2 is after dry a3
It carries out, thus the second test image 18 not or is only shunk not bigly before extension.
By the way that the lighting condition progress in machine 1 to be then advantageously adapted to, the second test chart can also be detected together
Case 18, and can be subjected to same analysis treatment progress: the illumination (instead of in diffusion) of reflection make printable fabric surface with
Comparison enough is obtained between luminous gloss varnish surface, wherein at the same maintain in camera review ink and printable fabric it
Between enough comparisons.
E) compensation of printing image 13 is calculated:
E1) in the case where upper gloss varnish:
E11) compare the second test pattern 18 and the second reference in the second reference picture 19 in a manner of computer supported
The first test pattern 16 in image 19.
E12 the difference between the first test pattern 16 and the second test pattern 18) is calculated in a manner of computer supported.
Furthermore it is preferred that it is considered that the interval variation of the test badge (disk) between the two test patterns.It is distinguished based on these,
The coefficient of torsion for subsequent adaptation e13 can be obtained in a manner of computer supported.These coefficients of torsion can calculate
Pusher side is stored and is called in the following print job with same printable fabric.
E13 it) is based on difference calculated, by ' the adaptation of gloss varnish image 13 to be printed preferably in a manner of computer supported
In ink image 13 to be printed.If producing gloss varnish image in digital form, corresponding print head is by being adapted to
Gloss varnish image controled.Differently therefrom, using traditional gloss varnish version, it is possible thereby to the gloss varnish image 13 that will be adapted to
' the manufacture (or exposure) for (adaptation) gloss varnish version.
By comparing the coordinate of the first test pattern 16 (ink) and additional the second test pattern 18 (gloss varnish) applied, by
This can calculate movement/deformation between ink and gloss varnish (or corresponding image).However, due to being adapted in lighting condition
Worse signal-to-noise ratio (SNR) in the case that gloss varnish is applied, may lose measurement accuracy.Therefore it can be beneficial that it is preferred that dividing
Open independently and with high accuracy measurement page deformation, and then separately and low accuracy measure pigment-gloss varnish-
Register (Farb-Lack-Register).This method requires the reflection characteristic on printable fabric surface and gloss varnish surface to have enough areas
Not.For the second test pattern 18, has proven to as advantageously, instead of in the dot on unprinted printable fabric, and use
The circular void 60 (referring to fig. 2) on the printable fabric of gloss varnish is gone up, because these gaps 60 can more reliably and less be done
It disturbs/is less inaccurately printed.It alternatively, can also be in upper gloss varnish unit 10 using coloured silk in order to be measured to deformation
Color/dyeing gloss varnish or printing color.Then special illumination is not needed, and measurement result there may be and print phase
As accuracy.
E21 the first test pattern 16 and the first reference in the second reference picture 19) are compared in a manner of computer supported
The first test pattern 16 in image 17.Herein can with it is desirable that, it is contemplated that so-called charging to version (Anlagepasser),
That is: by the two reference picture mutual orientations, especially along the direction transverse to the direction that page conveys.This orientation can
It is realized with the center test badge at the front seamed edge according to page.
E22 the difference between the first test pattern 16 and the second test pattern 18) is calculated in a manner of computer supported.
For this purpose, it is preferred that being considered that the interval variation of test badge between the two test patterns.It, can be in terms of based on these differences
The mode that calculation machine is supported obtains the coefficient of torsion for subsequent adaptation e23.These coefficients of torsion can be deposited in computer-side
It stores up and called in the following print job with same printable fabric.In addition to printable fabric (material, traffic direction)
Except correlation, there may also be drying temperature specific for print job and/or the correlations of print speed printing speed.It therefore can be with
It maintains to possess multiple coefficients of torsion for multiple print jobs, such as in the database.
Page deformation calculating: calculated between the respective point of two data groups difference vector (and in order to
The monitoring of operator and optionally show, referring to fig. 4).Page can be sought out based on these vectors and/or oriented data group
Open 2 accurate deformation.Resolution ratio is herein only because for finding the method for dot center and since the precision of transformation is limited
System.Typically, this method at least one coefficient 3 to 5 more more acurrate than the resolution of video camera of script, thus for example big by having
The camera chain of the resolution of video camera of about 670dpi may be implemented with about 10 μm or the preferably measurement of precision.
Result is reduced to several convictive parameters of tool: in the preferred configuration of test pattern 16 (referring to Fig. 3 a-e)
In, these disks 21 can be set on the rectangular grid of the rule inside the printable area 80 of page 2, thus crowd around
(umspannend) polygon necessarily leads to rectangle out (see, for example, the dotted line 70 in Fig. 4).These measurements can be measured
The deviation (polygon 71 pointed with the finger or gesticulate in referring to fig. 4) of point and this rectangle.
The characteristic parameter as shown in Fig. 3 a to 3e is preferably calculated, mode is respectively to calculate hacures expression
And measurement interval 40 shown in the disk 50 used to calculate, and (ask poor) compared with ideal interval 41.Referring to respectively
Ideal expectation interval 41 calculates the interval of the interval relative constriction s=40/ 41 in the interval 40 that can be based on having measured.Dotted line
The rectangle of (desired position) disk 21 around test pattern 16 is respectively represented into 3e in Fig. 3 a.Dotted line Fig. 3 a extremely
The polygon of the disk 21 measured around test pattern 16 is respectively represented in 3e.
E23) based on the calculated difference of institute, preferably in a manner of computer supported by ink image 13 to be printed (with
And optional gloss varnish image 13 to be printed ') adapt to (as other reference) cross cutting image 13 ".Especially to ink
This adaptation of image 13 can facilitate the printing image 14 having been compensated for for the print job being lined up.It is die cut image 13 " herein
It is unmodifiable (or constant image), this is because not suffering from variation significant and related with humidity (as receiving
Contracting is extended such).Being die cut image 13 " can actually include useful portion to be die cut on cross cutting pattern, such as page 2
(Nutzen) location and shape (or size), cross cutting unit 11 " are controled with the cross cutting image 13.Alternatively, it is die cut image 13
" be also possible to pure (digital) useful portion's image, cross cutting unit 11 not with the cross cutting image 13 " control, that is: the mould
It cuts image 13 and " is solely for other reference picture.This adaptation for example can be used as converse trapezoidal distortion and realize.Upper bright
In the case where oil, gloss varnish image 13 ' is adapted to twice: once adapting to ink image 13, and another time adapts to cross cutting figure
Picture 13 ".
Calculate the corrected parameter of RIP (grating image processing) process of being directed to: based on the calculated phase of institute (as described above)
To contraction, the corrected parameter deformed for page 2 can be derived.Printing image (presswork of queuing) to be printed is necessary
So amplified at corresponding position with Coefficient m, so that this amplification after shrinking is with the coefficient s of required taking-up (that is, s*m
=1 or m=1/s) it is compensated.
F) it prints: finally, (for ink and when necessary may be used by corrected (or being adapted to distortion) image data
The gloss varnish of energy) execute print job (only ink either ink highlights oil).
Reference signs list
1 ink-jet printer
2 pages being made of printable fabric
3 are directed to the receptacle of page
4 pass through the transport path of printing machine
5 arrive the transport path of receptacle
6 arrive the transport path of printing machine
7 one/multiple ink jet printing heads
7a ink
Image printed by 7b
8 one/multiple video camera/camera chains
8a search coverage
8 ' alternative camera positions
9 infrared dryers
9a radiation
Gloss varnish unit on 10
10a gloss varnish
11 cross cutting units
11a mold cutter
11 ' separate independent cutting part
12 computers
13 printing images, ink image
13 ' gloss varnish images
13 " cross cutting images
The 14 printing images having been compensated for
15 interconnecting pieces
16 first test patterns
17 first reference pictures
18 second test patterns
19 second reference pictures
20 test pulls
21 disks
22a row
22b column
40 intervals
41 intervals
50 non-printing zones
The gap of 60 gloss varnish Circle in Digital Images dish types
70 rectangles
71 polygons
The printable area of 80 pages
The calibration of a00 camera chain
A0 method and step: it provides
A method and step: the first round
A1 method and step: printing
A2 method and step: detection
A3 method and step: dry
A4 method and step: upper gloss varnish
B method and step: storage
C method and step: it feeds again
D method and step: the second round
D1 method and step: the first test pattern of detection
D2 method and step: the second test pattern of detection
E method and step: it is calculated in a manner of computer supported
E11 method and step: compared in a manner of computer supported
E12 method and step: it is calculated in a manner of computer supported
E13 method and step: adaptation
E21 method and step: compared in a manner of computer supported
E22 method and step: it is calculated in a manner of computer supported
E23 method and step: adaptation
F method and step: printing
Claims (10)
1. a kind of method for preventing misprint in water-based ink printing, includes the following steps:
Calibrate multiple video cameras (8)；
(a0) first test pattern (16) of the disk (21) with filling is provided；
By multiple ink jet printing heads (7) during (2) first round of printable fabric page (a, 4) is by ink-jet printer (1)
(a1,7,7a) first test pattern (16) is printed with water-based inks (7a), wherein generates test pull (20)；
During the first round (a, 4), by the video camera (8) detection (a2,8,8a, 8 ') the first test pattern (16)
The disk (21) of filling, wherein generate the first reference picture (17)；Or based on for provided by the first test pattern (16)
Data generate the first reference picture (17)；
Storing (b, 3,5) has the printable fabric page (2) of test pull (20) until adapting to environment；
It is examined during (2) second round of printable fabric page (d, 4,6) is by ink-jet printer (1) by the video camera (8)
Survey (d1,8,8a, 8 ') disk (21) of the filling of the first test pattern (16), wherein generate the second reference picture (19)；And
Based on the first reference picture compared with the second reference picture (17,19), (e, 12) is calculated in a manner of computer supported
It prints image compensation (14).
2. according to the method described in claim 1,
It is characterized in that,
There to be the printable fabric page (2) of test pull (20) in ink-jet printer (1) external storage (b, 3,5) until adapting to
Steric requirements, especially environment temperature and/or ambient humidity.
3. method according to one of the above claims,
It is characterized in that,
By printable fabric page (2) for the second round (d, 4) again feed (c, 6), especially with in the first round (a, 4)
Identical orientation.
4. method according to one of the above claims,
It is characterized in that,
Also bright using what is be at least adapted to using the ink image (13) being at least adapted to and in the case where upper gloss varnish (a4)
Oily image (13 ') prints (f) at least one print job.
5. method according to one of the above claims,
It is characterized in that,
The first test pattern (16) of disk (21) with filling is provided,
Wherein, the disk (21) is in the form of at least two rows (22a) transverse to the conveying direction cloth of printable fabric page (2)
It sets.
6. according to the method described in claim 5,
It is characterized in that,
The first test pattern (16) of disk (21) with filling is provided,
Wherein, the disk (21) is parallel to the conveying direction cloth of printable fabric page (2) in the form of at least two column (22b)
It sets.
7. according to the method described in claim 6,
It is characterized in that,
The first test pattern (16) of disk (21) with filling is provided,
Wherein, the disk (21) is arranged in the form of four rows (22a) He Silie (22b).
8. method according to one of the above claims,
It is characterized in that,
The first test pattern (16) of disk (21) with filling is provided,
Wherein, the diameter of the disk (21) of the filling is 50 to 150 printing points or 30 to 80 camera pixels.
9. the method according to one of claim 5 to 8,
It is characterized in that,
Respectively by video camera (8) during the first round (a, 4) detection (a2,8,8a, 8 ') the first test pattern (16) fill out
The disk (21) that fills and during the second round (d, 4,6) detection (d1,8,8a, 8 ') filling of the first test pattern (16)
Disk (21),
Wherein, each one column (22b) of video camera (8) detection.
10. method according to one of the above claims,
It is characterized in that,
Multiple video cameras (8) are calibrated,
Wherein, the coordinate transform between camera coordinates and print head coordinate is realized in a manner of computer supported.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018207845.9 | 2018-05-18 | ||
| DE102018207845 | 2018-05-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110497697A true CN110497697A (en) | 2019-11-26 |
Family
ID=68419860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910418701.XA Pending CN110497697A (en) | 2018-05-18 | 2019-05-20 | Method for preventing misprint in water-based ink printing |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110497697A (en) |
| DE (1) | DE102019204645A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111942034B (en) * | 2020-08-26 | 2021-12-03 | 佛山欧神诺陶瓷有限公司 | Inkjet printing apparatus and inkjet printing control method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0569545A (en) * | 1991-09-11 | 1993-03-23 | Canon Inc | Image forming device |
| US20100039470A1 (en) * | 2008-08-15 | 2010-02-18 | Sony Corporation | Liquid ejection device and liquid ejection method |
| CN104029511A (en) * | 2013-03-04 | 2014-09-10 | 海德堡印刷机械股份公司 | Method for producing printing image made up of sections on material to be printed using two inkjet printing heads |
| CN104553304A (en) * | 2013-10-25 | 2015-04-29 | 海德堡印刷机械股份公司 | Proof quality control |
| CN105579239A (en) * | 2013-09-25 | 2016-05-11 | 柯尼格及包尔公开股份有限公司 | Web-fed inkjet printing press, printing ink and method for printing a printing material |
| CN107433780A (en) * | 2016-05-25 | 2017-12-05 | 海德堡印刷机械股份公司 | Method for identifying the print nozzles failure in ink-jet printer |
| CN107627752A (en) * | 2016-07-19 | 2018-01-26 | 海德堡印刷机械股份公司 | Method for manufacturing printed matter |
| CN107856411A (en) * | 2012-06-15 | 2018-03-30 | 海德堡印刷机械股份公司 | Method for being applied indirectly to printed liquid on printable fabric |
-
2019
- 2019-04-02 DE DE102019204645.2A patent/DE102019204645A1/en not_active Withdrawn
- 2019-05-20 CN CN201910418701.XA patent/CN110497697A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0569545A (en) * | 1991-09-11 | 1993-03-23 | Canon Inc | Image forming device |
| US5528270A (en) * | 1991-09-11 | 1996-06-18 | Canon Kabushiki Kaisha | Method for correcting density unevenness for a recording head and an image formation apparatus provided with such a method |
| US5946006A (en) * | 1991-09-11 | 1999-08-31 | Canon Kabushiki Kaisha | Method for correcting density unevenness for a recording head and an image formation apparatus provided with such a method |
| US20100039470A1 (en) * | 2008-08-15 | 2010-02-18 | Sony Corporation | Liquid ejection device and liquid ejection method |
| CN107856411A (en) * | 2012-06-15 | 2018-03-30 | 海德堡印刷机械股份公司 | Method for being applied indirectly to printed liquid on printable fabric |
| CN104029511A (en) * | 2013-03-04 | 2014-09-10 | 海德堡印刷机械股份公司 | Method for producing printing image made up of sections on material to be printed using two inkjet printing heads |
| CN105579239A (en) * | 2013-09-25 | 2016-05-11 | 柯尼格及包尔公开股份有限公司 | Web-fed inkjet printing press, printing ink and method for printing a printing material |
| CN104553304A (en) * | 2013-10-25 | 2015-04-29 | 海德堡印刷机械股份公司 | Proof quality control |
| CN107433780A (en) * | 2016-05-25 | 2017-12-05 | 海德堡印刷机械股份公司 | Method for identifying the print nozzles failure in ink-jet printer |
| CN107627752A (en) * | 2016-07-19 | 2018-01-26 | 海德堡印刷机械股份公司 | Method for manufacturing printed matter |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102019204645A1 (en) | 2019-11-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11321028B2 (en) | Correcting registration errors in digital printing | |
| CN107433780B (en) | Method for identifying printing nozzle faults in an inkjet printer | |
| US10226955B2 (en) | Method for setting up and operating an inkjet printing machine for a print job | |
| US7997200B2 (en) | Printing machine and a method for producing a printed product | |
| JP6544858B2 (en) | Ink jet printing apparatus and ink jet head discharge performance evaluation method | |
| EP3162569B1 (en) | Inkjet print device and inkjet head ejection performance evaluation method | |
| CN104029511B (en) | The method for producing the printing image being made up of section on the substrate by two ink jet printing heads | |
| US20150367662A1 (en) | Methods of printing calibration patterns, calibration methods, and printers | |
| CN102555457B (en) | Inkjet recording apparatus and inkjet recording method | |
| CN104044359A (en) | Large sheet image on paper registration | |
| EP2809059A2 (en) | Image processing method, image processing device, image processing program and image formation device | |
| CN109070581B (en) | The polychrome printing formed in measurement and correction printing material is printed onto printing registration | |
| CN110136094A (en) | Adapting to image smoothing processing | |
| CN109696184A (en) | Encoder, robot and printer | |
| CN110497697A (en) | Method for preventing misprint in water-based ink printing | |
| CN108688335A (en) | Printing equipment and Method of printing | |
| CN110062699A (en) | The system and method for print conditions is determined based on the image pattern by printing based on shuttle-type printer | |
| US20130027447A1 (en) | Image forming apparatus and image forming method | |
| CN109760419A (en) | Method for preventing the misprint in the ink jet printing based on water | |
| WO2015198719A1 (en) | Recording head, recording head adjustment system, and recording head adjustment method | |
| CN1598872B (en) | Method and printer for applying an ink image to a receiving material | |
| CN110893725A (en) | Register-register measurement with circular measurement marks | |
| JP6293027B2 (en) | Image defect detection apparatus and method, and program | |
| US20230264483A1 (en) | Detecting a defective nozzle in a digital printing system | |
| US10992840B2 (en) | Obtaining printed element data of patches to determine calibration data of a printer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20191126 |