CN103144442B - For the method and apparatus that carries out ink jet printing on bending vessel surface - Google Patents

For the method and apparatus that carries out ink jet printing on bending vessel surface Download PDF

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Publication number
CN103144442B
CN103144442B CN201210599072.3A CN201210599072A CN103144442B CN 103144442 B CN103144442 B CN 103144442B CN 201210599072 A CN201210599072 A CN 201210599072A CN 103144442 B CN103144442 B CN 103144442B
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printing
nozzle row
motion
nozzle
ink droplet
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CN103144442A (en
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安德烈亚斯·克劳斯
安德烈亚斯·松瑙尔
马丁·卡默尔
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Krones AG
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Krones AG
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    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Ink Jet (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The present invention has illustrated a kind of for carry out the method and apparatus of ink jet printing on bending vessel surface. By making curved surface to be printed at least one nozzle row motion relatively, this at least one nozzle row is orientated transverse to the direction of motion, and spray ink droplet at following injecting time point, the nozzle that described injecting time point depends on injection for each ink droplet print gap is separately adjusted, can compensate the distortion of the printed patterns causing due to different print gaps, and improve profile printing.

Description

For the method and apparatus that carries out ink jet printing on bending vessel surface
Technical field
The present invention relates to one at container, particularly on the curved surface of PET bottle or vial, sprayThe method and apparatus of ink print.
Background technology
On the container of for example beverage bottle and the like, carry out ink jet printing owing to transforming the complicated former figure of printingTime design freedom and can be that tool is advantageous with the adaptability fast of different product. But, owing to being bending mostlyVessel surface and using line-at-a-time printing head (this is because desired high throughput is commonly used on beverage interstitial wire)In situation, the printed patterns producing template relatively separately there will be less desirable deviation, particularly coarse printing, thisCan cause the unintelligible profile in printed patterns.
As known from EP1435296A1, EP0385624A1 and WO03002349, attemptImprove the Ink-jet Printing Quality on bending vessel surface by accurate guiding print head and surface. But, in injusticeIn smooth container profile, printing and the print head of nozzle row that has multiple arranged in succession in use, problem is stillDo not solve. Particularly because nozzle row different print gaps and skew and that tilt about vessel surface producesProblem still exists in described solution.
Summary of the invention
Therefore need to improve printing process and corresponding device for these aspects.
The task utilization proposing comes for the method for carrying out ink jet printing on the surface of bend of vessel according to a kind ofSolve. Relatively at least one nozzle row motion of curved surface to be printed accordingly, this at least one nozzle row transverse to orFavour the direction orientation of relative motion. In addition, spray ink droplet at following injecting time point, described injecting time point is for eachInk droplet depends on the print gap separately of the nozzle of injection and adjusts.
Injecting time point can be especially by along or against printing direction of feed on pattern template to be printedPassing each picture point adjusts. Do not pass against the picture point ratio of print direction (can be regarded as the meaning of printing feed motion)Picture point is printed at time point more early, or conversely. Therefore, only need to mate printing stencil (Druckvorlage), and nothingNeed adjust respectively by independent control signal the injecting time point of each nozzle. But the latter is also feasible in theory.
Printing stencil can reduce or compensate in simple mode with in the case of the printing quality of face homogeneous thusError in the situation that two-dimentional printing stencil is changed into three dimensional printing. This class error may be due at print head and to be printedSurface between relative motion, the different duration flight due to ink droplet, irregular surface and/or by versionThe deviation determining and producing about the ink-jet incident of the inclination in default printing position. Particularly PET bottle and vial canCan have the dimensional tolerance determining by manufacturing, this tolerance can be put to compensate by coupling injecting time according to the present invention, withJust still ensure desired printed patterns.
In this case, relative motion is substantially corresponding to the printing movement between print head and surface to be printed(meaning is the feed motion on column direction and line direction). Print gap can be phase for all nozzles of nozzle rowWith. Therefore the injecting time point of nozzle row can be identical equally.
Preferably be provided with the nozzle row of at least two arranged in succession in the direction of motion, and injecting time point depends onSpacing between nozzle row is adjusted. Thus can be to nozzle row until arrive the motion in the default printing position of body surfaceTime difference compensates, equally also can to ink droplet to the desirable vertical incidence direction on body surface and flight path partiallyPoor compensating.
In particularly advantageous improvement project, injecting time point depend in addition ink droplet respectively with surface form incidence angleDegree is adjusted. Can calculate especially accurately about the geometrical deviation in default printing position each nozzle row thusAnd compensate in printed patterns.
Preferably in the radial oriented both sides, centre position of the main shaft about container, in the direction of motion, be in succession provided with toFew two nozzle row, the injecting time point of ink droplet depend in addition spacing between transporting rail and the centre position of container,Spacing between nozzle row and centre position separately and container radius are separately adjusted. These spacing are substantially fixedJustice the right-angle side of following right angled triangle, the hypotenuse of this right angled triangle by the main shaft from container of illusion to spray separatelyThe connecting line that mouth is capable forms.
Transporting rail is for example the orbit of putting bottle platform. Spacing between centre position and transporting rail for example aboutThe pitch circle of the movement locus of orbit and/or container main shaft defines. Centre position is corresponding to radial oriented nozzle rowImaginary position. Can be easy to especially make printing to control and different container dimensional and container platform by above-mentioned spacingJoin.
Preferably in the direction of motion, be in succession provided with at least two nozzle row, and nozzle row is transverse to direction of motion mistakeOpen, particularly (for example there is the print head of two nozzle row along the stagger half of printed resolution separately of nozzle rowIn situation) or 1/3rd (for example, in the case of thering is the print head of three nozzle row). Nozzle is therefore respectively in advanceThe printing gap of nozzle in print. Can further optimize thus printing quality.
Rotate before nozzle row rotation axis motion of preferred surface, and opening up of forming about the rotation axis that rotates of print gapAll sides of opening define. This has simplified the calculating of the geometrical deviation of each nozzle row.
In particularly advantageous design, on the expanding unit of all sides (Abwicklung), set up printing stencil forControl at least one nozzle row. This makes two-dimentional printing stencil and bending mating of print surface become easy.
In the preferred improvement project of another kind of the present invention, nozzle row is moved surfacewise, and print gap aboutAt least one extensible defines, and this at least one extensible face is parallel to the axis of symmetry of object to be printed. ByThis also can print the surface of non-rotating symmetry with the precision improving especially.
Preferably adjust as follows injecting time point, that is, the picture point of printing former figure is being moved on printing stencilIn direction or the contrary direction of motion pass, and picture point based on having passed is controlled at least one nozzle row. In printingThe picture point mutually staggering in the direction of motion in template is printed at different time points. Under ink droplet therefore when differentBetween put injected. Therefore can by print former figure on printing stencil in the direction of motion targetedly distortion come nozzleDifferent printing spacing compensate.
Addedly, can mate in the following way injecting time point, that is, give the each of each nozzle or printing stencilThe individual picture point free deviation of attaching troops to a unit respectively, and ink droplet is sprayed in the case of considering the time deviation attached troops to a unit respectivelyPenetrate. Time deviation can not rely on printing stencil and is attached to each nozzle or nozzle row thus.
Preferably on the radial oriented centre position of the main shaft about container, be provided with intermediate noxzzle capable, and in printingIn template, attach troops to a unit and compare the picture of the nozzle row before or after being positioned at of attaching troops to a unit in the capable picture point of intermediate noxzzle in the direction of motionPoint is not passed about the direction of motion or is less passed. Therefore, the capable reference can be used as about the direction of motion of intermediate noxzzlePosition is used and makes the coupling of injecting time point become easy.
The injecting time point of preferred ink droplet can mate with the protruding or recessed bending radius arranging along container circumference. ByThis also can variable and accurately print the body structure surface with lug boss or depressed part.
In addition, injecting time point can depend on the duration flight of ink droplet and surface to be printed in the direction of motionSpeed adjust. Can consider equally the external interference factor for example causing due to air agitation, gravity and friction. Special, can not effects on surface about nozzle row, for the difference of different printing spacing, relative motion far away utilizes oneself correction functionCompensate. Ink droplet is more injected based on the preferred print gap of this correction function.
In addition, droplet size can be mated with the incident angle that body surface forms with ink droplet. Thus, for different enteringFiring angle degree also can reach ink droplet desired optical density (OD) from the teeth outwards. Especially, ink droplet is just more more so for ink dropletBe ejected into obliquely on surface. Here minimum droplet size obtains in the case of the incident direction at right angle.
In preferred design, print gap is between 0.5 to 20mm, particularly between 1 to 7mm. Thus canWith the quality to have improved, conventional container is mostly printed.
The preferred improvement project of another kind of the method according to this invention comprises the step for setting up printing stencil in addition,Wherein: default pattern grid is put on surface to be printed; To print former figure gridding based on pattern grid; By griddingThe former figure of printing project at least one extensible upper, to give the picture point of projection of the former figure of printing in the expanding unit of this faceUpper assignment printing coordinate. The former figure of printing on thus can be from gridding to object sets out and optimizes printing. This makes to calculate and couplingFor example for the geometrical deviation to each nozzle, differential time of flight, the change of the print gap that causes due to container profile withAnd the correction function compensating like that becomes easy.
Utilize the step for setting up printing stencil can solve in addition independently task, that is to say, mainly rootSet up printing stencil according to object. This realizes by the following method, that is, first print former figure from creation angle can with treatThe object matches of printing, and then produces on the other hand the printing stencil of distortion targetedly. In other words, this printed patterns canTo check and to optimize with together with object to be printed under unwrung state still.
Preferably, the former figure of the printing of gridding projects at least one week side, and wherein, projection source is positioned at all sidesOn rotation. Make thus the foundation of printing stencil and printing stencil become easy from the coupling of different print gap.
In particularly advantageous improvement project of the present invention, for the step of setting up printing stencil by surface to be printedThree-dimensional computations model realize. This angle from creation make special easily, printing various and that save the energyThe optimization of pattern becomes possibility.
Proposing of task is utilized a kind of for carrying out ink-jet on the body surface bending, particularly vessel surface in additionThe device of printing solves, and this device has: transverse to or at least a line inkjet nozzle of tiltedly arranging in print direction; Be used forThe positioning unit of surface to be printed and the relative motion of inkjet nozzle; For controlling the control module of inkjet nozzle, this controlConstruct as follows unit,, can spray ink droplet at following time point that is, and described time point is complied with for each ink dropletThe nozzle that Lai Yu sprays print gap separately regulates.
The preferred improvement project of this device be configured in addition to implement described method according to improvement project of the present invention.
Brief description of the drawings
The preferred embodiment of the present invention shown in the drawings. Wherein:
Fig. 1 is illustrated in the schematic diagram of the nozzle row of print direction upper container and print head;
Fig. 2 illustrates container and the print head view with respect to Fig. 1 side direction half-twist;
Fig. 3 illustrates for different print gaps and the sketch of ink droplet flight time are described;
Fig. 4 illustrates the sketch for the printing density that depends on incident angle and droplet size is described;
Fig. 5 illustrates that Grid Projection is to the schematic diagram on extensible; And
Fig. 6 illustrates the side view of the container of the former figure of printing with schematic grids.
Detailed description of the invention
Next with reference to Fig. 1 and 2 explanation according to of the present invention at container 1, for example on beverage bottle, carry out ink jet printingMethod preferred embodiment. But this method is also suitable for other to have the object of curved surface conventionallyPrint. Such surperficial 2 sections that schematically show in Fig. 1 as the sidewall of container 1. Surface 2 masters around container 1Axle 1 ' was rotatably positioned before the print head 3 of nozzle row 4. In this case, there is the printing machine of corresponding nozzle row 4And can arrange in known manner for the positioning unit of implementing printing movement between print head 3 and surface to be printed.According to the present invention, these positioning units and (unshowned) control module and/or assessment unit combination to nozzle row 4 and/Or the print gap that the printing time point of each nozzle 4a disposed thereon depends on is separately adjusted.
As can be seen from Figure 2, for example at least two nozzle row 4 arranged in succession on print direction 5, thereby at Fig. 1In only can identify one of them nozzle row 4. In addition, illustrate that optional intermediate noxzzle is capable, it is at the main shaft about container 1 radiallyThe upper orientation of centre position M of line 1 '. Each nozzle 4a of nozzle row 4 is respectively to carry out cloth to the different print gap 6 on surface 2Put. Nozzle row 4 transverse to or favour, be particularly orthogonal to print direction 5 and be orientated, and define the maximum of print head 3Printing width B. Shown nozzle row 4 and the quantity of nozzle 4a are in this case only as example. Equally also can arrangeThere are multiple print heads 3. So their preferred parallel are evenly arranged mutually in main shaft 1 ', be particularly arranged in such a way,That is, nozzle row 4 relative centre position M symmetric orientation, in other words if desired set intermediate noxzzle capable just in time radially inBetween the upper orientation of position M, as shown in Fig. 2.
Shown in Fig. 2 in addition, print direction 5 (meaning be printing direction of feed) by print head 3 with treatRelative motion between print surface in the region of print head 3 defines, in the example shown by the circumference on surface 2Tangent line on the printing position of line 2 ' upper picture point P below print head 3 defines.
The injecting time point of ink droplet 9 can for example depend on spacing between transporting rail and the centre position M of container 1,Spacing between each nozzle row 4 and centre position M and the radius r separately of container 1xRegulate. These spacing are basicOn defined the right-angle side of following right angled triangle, the hypotenuse of this right angled triangle by the imaginary main shaft 1 ' from container 1 toThe connecting line of nozzle row 4 separately forms. In Fig. 2, right-angle side is corresponding to line segment rN+dNAnd X/2.
In addition, optional periphery is shown in the subregion on circumference, its represents to have recessed bending and convex bendingVessel surface. In this case, print gap 6 changes along the circumference of the container 1 rotating. In the rotation position of known vessel 1In the situation of putting, the injection of ink droplet 9 can be according to the present invention and targeted of depressed part along container circumference and lug bossJoin.
As shown in Figure 1, print gap 6 can directly be defined as the spacing on surface to be printed. As nextWith reference to figure 5 and 6 also want more detailed description like that, print gap also can be defined as about all sides 7 that can launchVirtual size, this extensible face is for example the virtual all sides around the main shaft 1 ' of container 1 to be printed. Suitable all sidesFace is that combine arbitrarily cylinder, cone, the truncated cone and they.
Except container 1 is the rotation shown in Fig. 1 and 2, print head 32 motion (not shown)s surfacewise,Particularly when container to be printed does not have rotational symmetric cross section but for example when oval cross section. In this case, forDefinition print gap and/or the bus of extensible using as printing stencil can divide along ellipse or analogous shapeCloth. So extensible can be parallel to the axis of symmetry of container and be parallel to nozzle row 4 and be orientated.
The all sides 7 that can launch in the example of Fig. 2 are by its radius r around the main shaft 1 ' of container 1NDefine,Radius r is passed through in the position of lip-deep picture point P to be printedXDefine. In addition, print head 3 is with to all sides 7 that can launchSpacing dNLocate. In this case, in radius rXOn the print gap 6 of picture point P equal d according to definitionN+rN–rx。
Next by illustrating for depending on repairing of print gap correction printing time point at the coordinate shown in Fig. 2Positive function. But the corresponding calculating that depends on actual or virtual print gap 6 separately also can used other seatsIn the situation of mark system, carry out. But shown example tool has the following advantages, that is, all sides 7 that can launch are not only applicable to fixedThe print gap that justice is virtual, is also applicable to define printing stencil 8.
Between nozzle row 4, on print direction 5, determining to be provided with spacing X by version. Thus, common printingResolution ratio for example can reach 300 to 600dpi. Due to the bending on surface 2, ink droplet 9 can not be from the nozzle row of multiple arranged in successionIn 4, incide orthogonally on surface 2 simultaneously. Thus, the ink droplet 9 spraying from nozzle row 4 is because the spacing X of nozzle row 4 causesGeometrical deviation. As the bending radius r on printing positionXLess with the ratio of the spacing X of nozzle row 4, this effect is more obvious.This problem with and solution with reference in the radius r that is positioned at shown in Fig. 2XOn several on print direction 5 of picture point PWhat printing deviation Δ xgUtilize following formula (1) to (3) to illustrate:
( 1 ) - - - c 2 = ( r N + d N ) 2 + ( X 2 ) 2 → ( 1 ′ ) - - - c = ( r N + d N ) + ( X 2 ) 2
( 2 ) - - - α = a r c t a n ( X 2 ) r N + d N
(3)△xg＝(c-rx)·sinα
Will be (1'), in (2) substitution (3)
Δx g = ( ( r N + d N ) 2 + ( X 2 ) 2 - r x ) · sin [ arctan ( ( X 2 ) r N + d N ) ]
As can be seen from Figure 2, how much printing deviation Δ xgGeneration be because ink droplet 9 is not vertically mapped to surfaceOn 2. Printing deviation Δ xgTherefore depend on the spacing X of print gap 6 and shower nozzle capable 4. When for this object by energyWhen the print gap of defining virtual is carried out in all sides 7 of launching, this face is preferably also for setting up the throwing of affiliated printing stencil 8Shadow face. Virtual print gap equals r in exampleN-rX。
From this printing deviation Δ xgSet out and can calculate the correction function for each nozzle row 4. This correction functionCan supplement by revising zero point alternatively, mode is as follows,, considers the printing deviation on all sides 7 that can launch that isΔxN, for example, by formation and at lip-deep printing deviation Δ x to be printedgDifference. Thus, can additionally improve sealBrush quality.
Then revise by the injecting time point of coupling ink droplet 9, that is to say, by from print direction 5The nozzle row 4 mutually staggering is delayed injection or injection in advance targetedly. According to the present invention, injecting time point is logical especiallyCross along or on printing stencil 8, pass each picture point against the direction of motion 5 (that is to say print direction) and realize. ThisRevising for each nozzle row 4, for example, for the corresponding print line in printing stencil 8, is separate computations. Printing deviationΔxgIn the example of Fig. 2 for utilize the nozzle row 4 on the left side print arbitrarily picture point and be added to picture point because of print direction differentPattern coordinate on, and for utilize the right nozzle row 4 print identical picture point and deduct from its pattern coordinate.
If capable when be provided with intermediate noxzzle on radial oriented on the M of centre position, centre position M can be used as soBe used for how much printing deviation Δ xgThe reference point compensating. So the pattern coordinate that intermediate noxzzle is capable need to be about how muchPrinting deviation is passed, and only the pattern coordinate of the nozzle row 4 in outside needs.
If print gap 6 is because the profile of container side wall is not identical for each nozzle 4a, so however alsoBe can each nozzle of separate computations 4a printing deviation Δ xg. Then can basis for the injecting time point of each nozzle 4aAbove-mentioned sketch mates by passing pattern coordinate.
Another kind of correction function can compensate the flight time of the different length of ink droplet 9. Here also enter in principleThe correction of row to different printing spacing 6, these print gaps play work during there is relative motion between surface 2 and nozzle row 4With, although make approximately uniform ink droplet movement velocity vTAnd the injecting time point of identical ink droplet 9 still can be in printing sideOn 5, different printing position P is printed. This can cause the distortion of printed patterns and/or fuzzy. Do not consider friction lossAnd the delay of ink droplet 9 related to this, can utilize as follows formula (4) and (5) calculate differential time of flight Δ t and produce thusRaw printing deviation Δ xt, and can revise it if necessary:
(4)△xt＝△t·vO
( 5 ) - - - Δ t = Δ y v T ; Δ y = r N - r x
( 5 ′ ) - - - Δ t = r N - r x v T
By in (5') substitution (4): Δx t = r N - r x v T · v O
As shown in Figure 3, ink droplet 9 flies on surface 2 and all side 7 that can launch on flies for example stretch journey Δ y than flying to more,Therefore fly to surface 2 needed time Δ t also longer. In interval during this period of time, surface to be printed is with speed vOContinue fortuneMoving. The deviation delta x producingtWith on geometry, produce printing deviation Δ xgSimilar also can be updated to for postpone orSpray in advance in the correction function of ink droplet 9, for example, by the picture point under corresponding passing on printing stencil 8. The speed on surface 2Also can be preferably defined as the relative value about the speed of all sides 7 that can launch. Print speed printing speed v is depended in this correctionOAndAnd correspondingly mate for this reason.
In addition, actual in the situation that, also there will be the aerial friction loss of ink droplet. Depend on ink droplet diameter passableFor example determine for the correction function of the dependence of drop speeds and flight time and introduce and revise.
Air Flow and other environmental impact factors, for example temperature fluctuation, electrostatic potential energy, magnetic field and like that, according toThe type of droplet size, China ink and printhead type also may cause the dislocation of ink droplet 9. Other correction functions for this reason also can be by warpTest and draw, and introduce according to of the present invention and pass the correction to printing deviation by the coordinate in printing stencil.
Described correction function can be implemented before former figure loading printing, but also can be for example separate colors passage itRear enforcement. Alternatively, each or all correction function also can be by presetting for each nozzle row 4 and/or nozzle 4aThe time deviation that postpones to control or control in advance the explicit definition that changes injecting time point realize or also can be only withSuch correction time interval supplements.
The total correction function that depends on actual or virtual print gap 6 can comprise for example following, wherein, and printingSpacing 6 here represents for the ease of better reading with " d ":
-fΔxg(d) Geometric corrections;
-fΔxt(d) flight time is revised; And
-fΔxu(d) environmental impact factor, Air Flow and such correction
The correction one of the x coordinate to picture point P on print direction 5 for each nozzle row 4 and/or each nozzle 4aAs can be for example as the description of getting off:
This is modified at is to be undertaken by picture point P is passed to x ' from x.
Correction function or each correction value also can be rule of thumb by the test body and/or the test moulds that are shaped suitablyType draws. The symbol of correction function and formula depend on the position of nozzle row with respect to virtual printing position. Virtual printingThe for example position of the rotation by the expanding unit below print head, position limits.
Next the color density to printed patterns or black density and surperficial three-D profile to be printed another with reference to figure 4One feasible matching scheme describes.
The China ink of executing on curved surface preferably depends on its smooth with respect to shown in the position I at Fig. 4 accordinglyThe local dip of vessel surface is revised, to ensure the uniform optical density (OD) of China ink. As Fig. 4 in the II of position for inclinationSurface segment shown in, for example incident of the inclination of ink droplet 9 may cause not having in printed patterns on surface 2 orThe space being covered by China ink only in shortagely.
This can for example mate next gram of droplet size by depending on the incidence angle λ of ink droplet 9 in lattice processorClothes. Alternatively, can reach similar effect by the color saturation improving targetedly in printing stencil. Therefore,Can be by black density revision to rated value, shown in Fig. 4 in the III of position. Alternatively, can pass through gridWidth R is reduced to R ' and reaches similar effect, shown in Fig. 4 in the IV of position.
For the moistening factor in surface 2, for example surface tension preferably can draw according to the experience under actual conditions. For exampleUnder the incidence angle λ having limited, effects on surface section prints and draws for repairing under droplet size and/or mesh width ROn the occasion of. In this case, also can consider that China ink flows away along rake.
In addition, be next used for bending table according to of the present invention for setting up with reference to 5 and 6 couples, figure on extensibleThe method of the printing stencil of face describes, and it is preferably corresponding to the above-mentioned all sides 7 that can launch.
Fig. 5 illustrates: curved surface to be printed, and ink droplet 9 should be laid on this surface with printed resolution A; And energyThe printing stencil 8 printing for effects on surface can for example be set up in all sides 7 of launching on its expanding unit. In order to reachThe picture point that each of this object curved surface represents by ink droplet 9 in Fig. 5 projects to from projection centre 10s can exhibitionOn all sides 7 of opening, wherein, projection centre is for example corresponding to the main shaft 1 ' of container to be printed 1. Due to projection centre 10The radial spacing of skew, the local printed resolution A ' of ink droplet 9 on all sides 7 that can launch is in some places and in bendingLip-deep local printed resolution A difference.
According to the present invention, on printing stencil 8, the position of each picture point can be separate, and therefore local resolutionA ' also can change targetedly, to produce from the teeth outwards unified as far as possible printed resolution A, as shown in FIG. 5Like that. In this case, the radially boost line 9 ' in Fig. 5 is corresponding to ink droplet 9 on different printing position from the teeth outwardsTheoretic flight path.
Correspondingly, virtual print gap can be expressed as the picture point (ink droplet in Fig. 5) on all sides 7 that can launchWith on surface to be printed under region on radial spacing poor of picture point (ink droplet in Fig. 5).
When use has in the situation of common printed template of unified resolution, different print gaps in contrast mayCause the skimble-scamble printed resolution A on surface 2. Some ink droplets 9 therefore may be for example overlapping, and other ink droplets 9 itBetween produce unlapped space.
As schematically shown in Fig. 6, this will be avoided by the following method according to the present invention, that is, and and will be corresponding to instituteThe grid 11 of the printed resolution A expecting is put on the surface to be printed of container 1. Be preferably based on this grid 11 on surface 2In threedimensional model, former Figure 12 is printed in design and/or layout. Then the site of grid 11 projects on all sides 7 that can launch, byThis local buckling according to surface 2 produces local different mesh width or printed resolution on all sides 7 that can launchA '. Make to print from another suitable axis of symmetry of the main shaft 1 ' of container 1 and/or all sides 7 that can launch by projectionBrush former Figure 12 distortion the and thus position of each picture point being revised on printing stencil 8 targetedly.
For example draw print gap 6 from threedimensional model and extensible all sides 7 on surface 2. In addition draw ink droplet flightDistance length between track and surface 2 and the intersection point of all sides 7. For example, under print gap 6, picpointed coordinate and Color ChannelValue is stored the data as each picture point. So the print gap 6 drawing also can be for above-mentioned correction function.
The printing stencil 8 with respect to the former Figure 12 distortion of printing of realizing according to the present invention provide extra on the creation fromBy space, this makes the accurate especially printing of former Figure 12 become possibility. Especially by surface 2 or the three-dimensional of affiliated container 1Model just can be assessed also in visual aspects final printed patterns particularly well in when design can be with simplyMode modify.
In computing unit, can be set up according to the present invention on bending body surface 2 by described printing process especiallyPrinting stencil 8. Therefore can make independently technical problem be resolved.
Be and injecting time point carried out based on depending on print gap 6 according to of the present invention but tool is advantageous especiallyThe combination of the printing process of revising. Can especially effectively combine by extensible described method.
In this case, described method and correction function can be with any combination of reasonable manner technically.

Claims (20)

1. for carrying out the method for ink jet printing on the curved surface in container (1), wherein: surface to be printed relatively at leastThe motion of nozzle row, described nozzle row transverse to or favour the direction of motion (5) orientation; And at following injecting time pointSpray ink droplet (9), the nozzle (4a) that described injecting time point depends on injection for each ink droplet print gap separatelyAdjust, it is characterized in that, adjust as follows injecting time point, that is, and the picture point of the former figure of printing (12) under makingPass in the upper or contrary described direction of motion (5) of the described direction of motion (5) printing stencil (8) is upper, and based on having passedPicture point is controlled described at least one nozzle row (4).
2. method according to claim 1 wherein, is in succession provided with at least two nozzles in the described direction of motion (5)Row (4), and the spacing (X) that described injecting time point also depends between nozzle row is adjusted.
3. method according to claim 1 and 2, wherein, described injecting time point also depend on described ink droplet (9) respectively withThe incident angle (λ) that described surface forms is adjusted.
4. method according to claim 1, wherein, the main shaft (1 ') about described container (1) radial oriented inBetween position (M) both sides, in the described direction of motion (5), be in succession provided with at least two nozzle row (4), and described ink droplet(9) injecting time point also depend on spacing between the transporting rail of described container (1) and described centre position (M),Spacing between nozzle row (4) and described centre position (M) separately and described container (1) radius (r separatelyx) adjustWhole.
5. according to the method described in any one in claim 1-2, wherein, in the described direction of motion (5), be in succession provided with toFew two nozzle row, and described nozzle row staggers transverse to the direction of motion.
6. according to the method described in any one in claim 1-2, wherein, the described surface rotation axis that rotates before described nozzle row(1 ') motion, and described print gap defines about all sides (7) that can launch that form around described pivot center.
7. method according to claim 6 wherein, is set up printing on the expanding unit of the described all sides (7) that can launchTemplate (8) is for controlling described at least one nozzle row.
8. according to the method described in any one in claim 1-2, wherein, described nozzle row is along described apparent motion, andAll sides that described print gap can launch about at least one define, and the described all parallel sided that can launch are in to be printedThe axis of symmetry ground orientation of object.
9. method according to claim 1, wherein, the main shaft (1 ') about described container (1) radial oriented inBetween to be provided with intermediate noxzzle on position (M) capable, and attach troops to a unit in the capable picture point of described intermediate noxzzle on described printing stencil (8)Compare the picture point of the nozzle row (4) of attaching troops to a unit before or after being positioned at about the described direction of motion about the described direction of motion (5)Do not pass or less pass.
10. according to the method described in any one in claim 1-2, wherein, the injecting time point of described ink droplet (9) with along appearanceProtruding or the recessed bending radius coupling that device periphery arranges.
11. according to the method described in any one in claim 1-2, and wherein, described print gap is between 0.5 to 20mm.
12. according to the method described in any one in claim 1-2, and described method also comprises for setting up printing stencil (8)Step, it comprises as follows step by step: default pattern grid (11) is put on described surface to be printed; Based on described patternGrid will print former figure (12) gridding; Former the printing of gridding figure is projected to at least one all side (7) that can launch upper,On the expanding unit of the described all sides that can launch, assign printing coordinate to give the picture point of the projection of the former figure of described printing.
13. methods according to claim 12, wherein, project at least one by former the printing of described gridding figure (12)The all sides (7) that can launch are upper, and projection source (10) is positioned on the rotation (1 ') of described all sides.
14. methods according to claim 12, wherein, treat by described for the step of setting up described printing stencil (8)The surperficial three-dimensional computations model of printing is implemented.
15. methods according to claim 13, wherein, treat by described for the step of setting up described printing stencil (8)The surperficial three-dimensional computations model of printing is implemented.
16. methods according to claim 1, wherein, described container (1) is PET bottle or vial.
17. according to the method described in any one in claim 1-2, wherein, in the described direction of motion (5), be in succession provided with toThe printed resolution that two nozzle row, and described nozzle row less stagger separately along described nozzle row transverse to the direction of motionHalf or 1/3rd.
18. according to the method described in any one in claim 1-2, and wherein, described print gap is between 1 to 7mm.
19. for carrying out the device of ink jet printing on the surface of bend of vessel, and it has:
-transverse to or favour print direction (5) arrange at least a line inkjet nozzle (4a);
-for the positioning unit of the relative motion of surface to be printed and described inkjet nozzle; With
-for controlling the control module of described inkjet nozzle, described control module is constructed as follows, that is, make it possible toSpray ink droplet (9) at following time point, the nozzle that described time point depends on injection for each ink droplet printing separatelySpacing is adjusted according to method according to claim 1.
20. devices according to claim 19, wherein, described container (1) is PET bottle or vial.
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