CN103144442A - Method and device for ink-jet printing on curved container surfaces - Google Patents
Method and device for ink-jet printing on curved container surfaces Download PDFInfo
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- CN103144442A CN103144442A CN2012105990723A CN201210599072A CN103144442A CN 103144442 A CN103144442 A CN 103144442A CN 2012105990723 A CN2012105990723 A CN 2012105990723A CN 201210599072 A CN201210599072 A CN 201210599072A CN 103144442 A CN103144442 A CN 103144442A
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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
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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
- B41J3/40733—Printing on cylindrical or rotationally symmetrical objects, e. g. on bottles
Abstract
The invention provides a method and a device for ink-jet printing on curved container surfaces. The method involves moving a curved surface for printing relative to at least one row of nozzles which is aligned transversely to movement direction. Ink drops are discharged at the ejection timing which is adjusted according to respective printing gaps of ejection nozzles with respect to each drop, so that printed pattern twisting caused by different printing distances can be compensated and outline printing can be improved.
Description
Technical field
The present invention relates to a kind of at container, the method and apparatus that particularly on the curved surface of PET bottle or vial, carries out ink jet printing.
Background technology
Carry out ink jet printing due to the design freedom when transforming the complicated former figure of printing on the container of for example beverage bottle and the like and can be that tool is advantageous with the adaptability fast of different product.But, owing to being crooked vessel surface mostly and using line-at-a-time printing head (this due to desired high throughput in the situation that commonly use on the beverage interstitial wire), the printed patterns produced template relatively separately there will be the deviation of not expecting, particularly coarse printing, this can cause the unintelligible profile in printed patterns.
As from EP1435296A1, EP0385624A1 and WO03002349 known, attempted improving the Ink-jet Printing Quality on crooked vessel surface by accurate guiding print head and surface.But, print on uneven container profile and still there is no solution in the situation that use has the print head problem of the nozzle row of a plurality of arranged in succession.Particularly because problem different print gaps and skew and that nozzle row that tilt about vessel surface produces still exists in described solution.
Summary of the invention
Therefore need to printing process and corresponding device, be improved for these aspects.
Proposing of task utilizes method according to claim 1 to solve.Relatively at least one nozzle row motion of curved surface to be printed accordingly, this at least one nozzle row transverse to or favour the direction orientation of relative motion.In addition, at following injecting time point, spray ink droplet, described injecting time point depends on the print gap separately of the nozzle of injection and is adjusted for each ink droplet.
The injecting time point can be especially by along or pass each picture point against the printing direction of feed on pattern template to be printed and adjusted.Picture point against print direction (can be regarded as the meaning of printing feed motion) is printed at more Zao time point than the picture point of not passing, or conversely.Therefore, only need to mate printing stencil (Druckvorlage), and adjust respectively the injecting time point of each nozzle without the control signal by independent.But the latter is also feasible in theory.
Thus printing stencil can with simple mode and in the situation that the printing quality of face homogeneous reduce or compensate in the situation that two-dimentional printing stencil is changed into to the error of three dimensional printing.This class error may produce due to relative motion, the different duration flight due to ink droplet, irregular surface and/or the deviation determined by version between print head and surface to be printed and about the ink-jet incident of the inclination in default printing position.Particularly PET bottle and vial may have the dimensional tolerance determined by manufacturing, and this tolerance can be put to compensate by the coupling injecting time according to the present invention, in order to still guarantee desired printed patterns.
In this case, relative motion is basically corresponding to the printing movement (meaning is the feed motion on column direction and line direction) between print head and surface to be printed.Print gap can be identical for all nozzles of nozzle row.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 on the direction of motion, and the spacing that the injecting time point depends between nozzle row is adjusted.Thus can be to nozzle row until arrive poor the compensating of run duration in the default printing position of body surface, equally also can to the desirable vertical incidence direction on body surface and the deviation of flight path, compensate ink droplet.
In particularly advantageous improvement project, injecting time point depends in addition ink droplet and is adjusted with the incident angle that surface forms respectively.Can calculate especially accurately and compensate in printed patterns about the geometrical deviation in default printing position each nozzle row thus.
Preferably at the main shaft about container radial oriented both sides, centre position, in succession be provided with at least two nozzle row on the direction of motion, the injecting time point of ink droplet depends in addition in the transporting rail of container and the spacing between centre position, is adjusted in nozzle row separately and the spacing between centre position and container radius separately.These spacings have defined the right-angle side of following right angled triangle basically, and by the main shaft from container of illusion, the connecting line to nozzle row separately forms the hypotenuse of this right angled triangle.
Transporting rail is for example the orbit of putting bottle platform.Spacing between centre position and transporting rail for example defines about the pitch circle of the movement locus of orbit and/or container main shaft.Centre position is corresponding to the imaginary position of radial oriented nozzle row.By above-mentioned spacing, can be easy to especially make printing to control and different container dimensionals and container platform coupling.
Preferably on the direction of motion, in succession be provided with at least two nozzle row, and nozzle row staggers transverse to the direction of motion, half of the printed resolution particularly staggered separately along nozzle row (for example, in the situation that there is the print head of two nozzle row) or 1/3rd (for example, in the situation that there is the print head of three nozzle row).Therefore nozzle is printed in the printing gap of nozzle in advance at each.Can further optimize printing quality thus.
Rotate before nozzle row rotation axis motion of preferred surface, and extensible all sides that print gap forms about the rotation axis that rotates define.This has simplified the calculating of the geometrical deviation of each nozzle row.
In particularly advantageous design, set up printing stencil for controlling at least one nozzle row on the expanding unit of all sides (Abwicklung).This makes the coupling of two-dimentional printing stencil and crooked print surface become easy.
In the preferred improvement project of another kind of the present invention, nozzle row is moved surfacewise, and print gap defines about at least one extensible, and this at least one extensible face is parallel to the axis of symmetry of object to be printed.Also can with the precision improved, to the surface of non-rotating symmetry, be printed especially thus.
Preferably adjust as follows the injecting time point, that is, the picture point of printing former figure is passed on printing stencil on the direction of motion or against the direction of motion, and the picture point based on having passed is controlled at least one nozzle row.The picture point mutually staggered on the direction of motion on printing stencil is printed at different time points.Affiliated ink droplet is therefore injected at different time points.Therefore can by print former figure on printing stencil on the direction of motion targetedly distortion the different printing spacing of nozzle is compensated.
Addedly, can mate in the following way the injecting time point, that is, give each picture point of each nozzle or printing stencil free deviation of attaching troops to a unit respectively, and make ink droplet in the situation that consider that the time deviation attached troops to a unit is respectively sprayed.Time deviation can not rely on printing stencil and is attached to each nozzle or nozzle row thus.
Preferably at the main shaft about container, on radial oriented centre position, be provided with intermediate noxzzle capable, and the picture point that in the intermediate noxzzle capable picture point of attaching troops to a unit is compared the nozzle row before or after being positioned on the direction of motion of attaching troops to a unit is not passed about the direction of motion or is less passed on printing stencil.Therefore, capable can be used as about the reference position of the direction of motion of intermediate noxzzle 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 arranged along the container circumference.Also can variable and accurately to the body structure surface with lug boss or depressed part, be printed thus.
In addition, the injecting time point can depend on the duration flight of ink droplet and the speed of surface on the direction of motion to be printed is adjusted.Can consider the external interference factor for example caused due to air agitation, gravity and friction equally.Especially, correction function that can effects on surface relative motion utilization oneself far away for the difference of different printing spacing about nozzle row compensates.Ink droplet is more injected based on the preferred print gap of this correction function.
In addition, the incident angle coupling that droplet size can form with ink droplet and body surface.Thus, also can reach ink droplet desired optical density (OD) from the teeth outwards for different incident angles.Especially, ink droplet more so ink droplet just be ejected on surface more obliquely.Here minimum droplet size in the situation that the incident direction at right angle obtain.
In preferred design, print gap is between 0.5 to 20mm, particularly between 1 to 7mm.Can to container commonly used mostly, be printed with the quality improved thus.
The preferred improvement project of the another kind of the method according to this invention comprises in addition for setting up the step of printing stencil, wherein: default pattern grid is put on surface to be printed; To print former figure gridding based on the pattern grid; The former figure of the printing of gridding is projected to at least one extensible above, in order to assign the printing coordinate to the picture point of the projection of the former figure of printing on the expanding unit of this face.The former figure of printing on thus can be from the gridding to the object sets out and optimizes printing.This make to calculate and coupling for example for the geometrical deviation to each nozzle, differential time of flight, the correction function that compensates of the change of the print gap that causes due to container profile and the like becomes easy.
Utilize the step for setting up printing stencil can solve independently task in addition, that is to say, can mainly according to object, set up printing stencil.This realizes by the following method, that is, at first print former figure from the angle of creation can with object matches to be printed, and then produce on the other hand the printing stencil of distortion targetedly.In other words, this printed patterns can be under unwrung state be still checked and is optimized with together with object to be printed.
Preferably, the former figure of the printing of gridding projects at least one week side, and wherein, projection source is positioned on the rotation of all sides.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 the three-dimensional computations model on surface to be printed, realize.This angle from creation makes especially easily, optimization various and that save the printed patterns of the energy becomes possibility.
Proposing of task is utilized in addition and is a kind ofly solved for the device that carries out ink jet printing on the body surface crooked, particularly vessel surface, and this device has: transverse to or at least a line inkjet nozzle of tiltedly arranging in print direction; The positioning unit that is used for the relative motion of surface to be printed and inkjet nozzle; For controlling the control module of inkjet nozzle, this control module is constructed as follows,, can spray ink droplet at following time point that is, and described time point depends on the nozzle print gap separately of injection and regulated for each ink droplet.
The preferred improvement project of this device be configured in addition to implement described method according to improvement project of the present invention.
The accompanying drawing explanation
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 that depends on the printing density of incident angle and droplet size for explanation;
Fig. 5 illustrates Grid Projection 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.
The specific embodiment
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 the method for ink jet printing preferred embodiment.But the object that this method also is suitable for other are had curved surface is usually printed.Such surperficial 2 sections that schematically show in Fig. 1 as the sidewall of container 1.Surface 2 main shafts around container 11 ' were rotatably positioned before the print head 3 of nozzle row 4.In this case, there is the printing machine of corresponding nozzle row 4 and can arrange in known manner for the positioning unit of implementing printing movement between print head 3 and to be printed surperficial 2.According to the present invention, these positioning units and (unshowned) control module and/or assessment unit combination, so that the print gap that the printing time point of nozzle row 4 and/or each nozzle 4a disposed thereon is depended on is separately adjusted.
As can be seen from Figure 2, at least two nozzle row 4 arranged in succession on print direction 5 for example, thus only can identify one of them nozzle row 4 in Fig. 1.In addition, optional intermediate noxzzle is shown capable 4 ', it is radially about the upper orientation of centre position M of the main shaft 1 ' of container 1.Nozzle row 4, each nozzle 4a of 4 ' arrange with the different print gap 6 to surface 2 respectively.Nozzle row 4,4 ' transverse to or favour, particularly be orthogonal to print direction 5 orientations, and define the maximum print width B of print head 3.Shown nozzle row 4,4 ' and the quantity of nozzle 4a in this case only as example.Equally also can be provided with a plurality of print heads 3.So their preferred parallel are evenly arranged mutually in main shaft 1 ', particularly be arranged in such a way, that is, and nozzle row 4 relative centre position M symmetric orientation, set intermediate noxzzle capable 4 ' just in time radially is orientated on the M of centre position in case of necessity in other words, as shown in Fig. 2.
As in Fig. 2 as shown in addition like that, print direction 5 (meaning is the printing direction of feed) defines by the relative motion in the zone of print head 3 between print head 3 and to be printed surperficial 2, by the tangent line on the printing position of periphery 2 ' the upper picture point P below print head 3 on surface 2, defines in the example shown.
The injecting time point of ink droplet 9 can for example depend on the radius r separately of transporting rail and the spacing between the M of centre position, the spacing between each nozzle row 4 and centre position M and the container 1 of container 1
xregulated.These spacings have defined the right-angle side of following right angled triangle basically, and by the imaginary main shaft 1 ' from container 1, the connecting line to nozzle row 4 separately forms the hypotenuse of this right angled triangle.In Fig. 2, right-angle side is corresponding to line segment r
n+ d
nand X/2.
In addition, optional periphery 2 is shown in the subregion on circumference ", it means to have the vessel surface of recessed bending and convex bending.In this case, print gap 6 changes along the circumference of the container 1 rotated.In the situation that the injection of the turned position ink droplet 9 of known vessel 1 can be mated with depressed part and lug boss along the container circumference targetedly according to the present invention.
As shown in Figure 1, print gap 6 can directly be defined as surperficial 2 spacing to be printed.As next also wanted more detailed description with reference to figure 5 and 6, print gap 6 ' also can be defined as the virtual size about extensible 7, and this extensible face is for example the virtual all sides around the main shaft 1 ' of container 1 to be printed.Suitable all sides are that combine arbitrarily cylinder, cone, the truncated cone and they.
Except container 1, the rotation shown in Fig. 1 and 2, print head 3 is 2 motion (not shown)s surfacewise, particularly do not have rotational symmetric cross section but for example during oval cross section when container to be printed.In this case, for the bus of extensible that defines print gap and/or use as printing stencil, can distribute along ellipse or analogous shape.So extensible can be parallel to the axis of symmetry of container and be parallel to nozzle row 4,4 ' orientation.
In the example of Fig. 2, extensible 7 is passed through its radius r around the main shaft 1 ' of container 1
ndefine, radius r is passed through in the position of the picture point P on surface to be printed 2
xdefine.In addition, print head 3 is with the spacing d to extensible 7
nlocate.In this case, in radius r
xon the print gap 6 of picture point P equal d according to definition
n+ r
n-r
x.
Next by the coordinate shown in Fig. 2, illustrate for depending on the correction function of print gap correction printing time point.But, depend on actual or virtual print gap separately 6,6 ' corresponding calculating also can be in the situation that be used other coordinate systems to carry out.But shown example has following advantage, that is, extensible 7 print gap 6 ' that is not only applicable to defining virtual, also be applicable to define printing stencil 8.
Be provided with spacing X by version between nozzle row 4 on print direction 5 with determining.Thus, common printed resolution for example can reach 300 to 600dpi.Due to the bending on surface 2, ink droplet 9 can not incide orthogonally on surface 2 simultaneously from the nozzle row 4 of a plurality of arranged in succession.Thus, the ink droplet 9 sprayed from nozzle row 4 is because the spacing X of nozzle row 4 causes geometrical deviation.As the bending radius r on printing position
xless with the ratio of the spacing X of nozzle row 4, this effect is more obvious.This problem with and solution with reference to the radius r that is positioned at shown in Fig. 2
xon the geometry printing deviation Δ x of picture point P on print direction 5
gutilize following formula (1) to (3) to illustrate:
(3)Δx
g＝(c-r
x)·sinα
By (1 '), in (2) substitution (3)
As can be seen from Figure 2, how much printing deviation Δ x
ggeneration be due to ink droplet 9 vertically be not mapped to the surface 2 on.Printing deviation Δ x
gtherefore depend on print gap 6,6 ' and the spacing X of shower nozzle capable 4.When for this purpose during by extensible 7 print gap that carrys out defining virtual 6 ', this face is preferably also for the perspective plane of the printing stencil 8 under setting up.Virtual print gap 6 ' equals r in example
n-r
x.
From this printing deviation Δ x
gset out and can calculate the correction function for each nozzle row 4.This correction function can be supplementary by revising zero point alternatively, and mode is as follows,, considers the printing deviation Δ x on extensible 7 that is
n, for example, by formation and the printing deviation Δ x on surface to be printed 2
gdifference.Thus, can additionally improve printing quality.
Then revised by the injecting time point of coupling ink droplet 9, be that is to say, by delayed injection or the injection in advance targetedly of the nozzle row 4 from mutually staggering on print direction 5.According to the present invention, injecting time point especially by along or pass each picture point against the direction of motion 5 (that is to say print direction) and realize on printing stencil 8.This correction, for each nozzle row 4,, for the corresponding print line in printing stencil 8, is for example separate computations.Printing deviation Δ x
gin the example of Fig. 2, for printing arbitrarily picture point, the nozzle row 4 of utilizing the left side is added on the picture point pattern coordinate different because of print direction, and for the nozzle row 4 identical picture points of printing of utilizing the right and deduct from its pattern coordinate.
If intermediate noxzzle is capable 4 ' when being provided with on radial oriented on the M of centre position, centre position M can be used as for to how much printing deviation Δ x so
gthe reference point compensated.So the pattern coordinate of intermediate noxzzle capable 4 ' need to not passed about how much printing deviation, and only the pattern coordinate of the nozzle row in the outside 4 needs.
So however or printing deviation Δ x that can each nozzle of separate computations 4a if print gap 6, the 6 ' profile due to container side wall are not identical for each nozzle 4a,
g.Then the injecting time point for each nozzle 4a can mate by passing the pattern coordinate according to above-mentioned sketch.
Another kind of correction function can compensate the flight time of the different length of ink droplet 9.Here also carry out in principle different printing spacing 6,6 ' correction, these print gaps work during relative motion occurring between surface 2 and nozzle row 4, although make approximately uniform ink droplet movement velocity v
tand the injecting time point of identical ink droplet 9 still can be printed different printing position P on print direction 5.This can cause the distortion of printed patterns and/or fuzzy.Do not consider the delay of friction loss and ink droplet 9 related to this, can utilize as follows formula (4) and (5) to calculate differential time of flight Δ t and consequent printing deviation Δ x
t, and can be revised it if necessary:
(4)Δx
t＝Δt·v
O
(5)
Δy＝r
N-r
x
(5′)
By in (5 ') substitution (4):
As shown in Figure 3, ink droplet 9 flies on surface 2 and flies for example stretch journey Δ y than flying on extensible 7 more, therefore flies to surface 2 needed time Δ t also longer.In interval during this period of time, to be printed surperficial 2 with speed v
ocontinue motion.The deviation delta x produced
twith generation printing deviation Δ x on geometry
gsimilar also can being updated to for postponing or spray in advance the correction function of ink droplet 9, for example, by the picture point under corresponding passing on printing stencil 8.Surface 2 speed also can preferred definition be the relative value about the speed of extensible 7.Print speed printing speed v is depended in this correction
oand correspondingly mated for this reason.
In addition, in the situation that actually also there will be the aerial friction loss of ink droplet.Depending on the ink droplet diameter for example can 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, also may cause the dislocation of ink droplet 9 according to type and the printhead type of droplet size, China ink.Other correction functions also can be drawn by experience for this reason, 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 loading the former figure of printing, but also can for example after the separate colors passage, implement.Alternatively, each or all correction function also can by preset for each nozzle row 4,4 ' and/or the delay of the nozzle 4a time deviation of controlling or control in advance to change the explicit definition of injecting time point realize or also can only be supplemented with such correction time interval.
Depend on actual or virtual print gap 6, total correction function of 6 ' can comprise for example following, wherein, print gap 6,6 ' is here for the ease of better reading with " d " and mean:
-f Δ x
g(d) Geometric corrections;
-f Δ x
t(d) flight time is revised; And
-f Δ x
u(d) environmental impact factor, Air Flow and suchlike correction
Generally can be for example as lower description to the correction of the x coordinate of picture point P on print direction 5 for each nozzle row 4 and/or each nozzle 4a:
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 rule of thumb draw by test body and/or the test model be shaped suitably.The symbol of correction function and formula depend on the position of nozzle row with respect to virtual printing position.The virtual printing position for example position of the rotation by the expanding unit below print head limits.
Next another the feasible matching scheme with reference to the three-D profile on the color density of 4 pairs of printed patterns of figure or black density and surface 2 to be printed describes.
The China ink of executing on curved surface preferably depends on its local dip with respect to the smooth vessel surface 2 shown in the position I at Fig. 4 and is revised accordingly, in order to guarantee the uniform optical density (OD) of China ink.As Fig. 4 in the II of position for as shown in the surface segment tilted like that, for example the incident of the inclination of ink droplet 9 may cause on surface 2 not having in printed patterns or only in shortage the space covered by China ink.
This can for example mate droplet size and overcome in the lattice processor by the incidence angle λ that depends on ink droplet 9.Alternatively, can reach similar effect by the color saturation improved targetedly in printing stencil.Therefore, can be by black density revision to rated value, as in Fig. 4 as shown on the III of position like that.Alternatively, can reach similar effect by mesh width R is reduced to R ', as in Fig. 3 as shown on the IV of position like that.
For the surperficial 2 moistening factors, for example surface tension preferably can draw according to the experience under actual conditions.For example under the incidence angle λ limited, the effects on surface section is printed and is drawn the affiliated correction value for droplet size and/or mesh width R.In this case, also can consider that China ink flows away along rake.
In addition, next with reference to figure 5 and 6 pairs, according to of the present invention, for the method for setting up on extensible for the printing stencil of curved surface, describe, it is preferably corresponding to above-mentioned extensible 7.
Fig. 5 illustrates: curved surface 2 to be printed, and ink droplet 9 should be laid on this surface with printed resolution A; And extensible 7, can for example set up the printing stencil 8 printed for effects on surface 2 on its expanding unit.For each picture point meaned by ink droplet 9 in Fig. 5 that reaches this purpose curved surface 2 projects to extensible 7 from the projection centre 10s, wherein, projection centre is for example corresponding to the main shaft 1 ' of container to be printed 1.Due to the radial spacing with projection centre 10 skews, the local printed resolution A ' of ink droplet 9 on extensible 7 is local different from the local printed resolution A on curved surface 2 at some.
According to the present invention, on printing stencil 8, the position of each picture point can be separate, and therefore local resolution A ' also can change targetedly, in order to produce unified as far as possible printed resolution A on surface 2, as shown in FIG. 5.In this case, the radially boost line 9 ' in Fig. 5 is corresponding to the theoretic flight path of ink droplet 9 on the different printing position on surface 2.
Correspondingly, virtual print gap 6 ' can be expressed as picture point (ink droplet in Fig. 5) on extensible 7 and on surface to be printed 2 under zone 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 6 ' may cause the skimble-scamble printed resolution A on surface 2 in contrast.Some ink droplets 9 therefore may be for example overlapping, between other ink droplets 9, produces unlapped space.
As Fig. 6 schematically shows, this will be avoided by the following method according to the present invention, that is, will be put on the surface to be printed 2 of container 1 corresponding to the grid 11 of desired printed resolution A.Be preferably based on this grid 11 design and/or layout in 2 the threedimensional model of surface and print former Figure 12.Then the site of grid 11 projects on extensible 7, produces local different mesh width or printed resolution A ' according to the local buckling on surface 2 on extensible 7 thus.Make to print former Figure 12 distortion the and thus position of each picture point being revised on printing stencil 8 targetedly by projection from another suitable axis of symmetry of the main shaft 1 ' of container 1 and/or extensible 7.
For example from threedimensional model and the extensible perspective plane 7 on surface 2, draw print gap 6,6 '.Draw in addition between ink droplet flight path and surface 2 and the intersection point on perspective plane 7 apart from length.For example under print gap 6,6 ', picpointed coordinate and Color Channel, value is stored the data as each picture point.So drawn print gap 6,6 ' 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 provides extra free space on the creation, and this makes the accurate especially printing of former Figure 12 become possibility.Just can assess particularly well and can modify in simple mode in visual aspects final printed patterns when designing by the threedimensional model of surface 2 or affiliated container 1 especially.
In computing unit, can by described printing process, on crooked body surface 2, be set up according to printing stencil 8 of the present invention especially.Therefore can make independently technical problem be resolved.
But tool is advantageous especially, be and the combination based on depending on print gap 6, the 6 ' printing process that the injecting time point is revised according to the present invention.By extensible described method, can especially effectively combine.
In this case, described method and correction function can be with reasonable manner any combination technically.
Claims (16)
1. in container (1), particularly PET bottle or vial, curved surface (2) on carry out ink jet printing method, wherein: relatively at least one nozzle row (4,4 ') motion of surface to be printed, described nozzle row transverse to or favour the direction of motion (5) orientation; And spray ink droplet (9) at following injecting time point, described injecting time point depends on nozzle (4a) print gap (6,6 ') separately of injection and is adjusted for each ink droplet.
2. method according to claim 1 wherein, in succession is provided with at least two nozzle row (4) on the described direction of motion (5), 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 depends on described ink droplet (9) and is adjusted with the incident angle (λ) that described surface (2) form respectively.
4. method according to claim 1, wherein, at the main shaft (1 ') about described container (1) both sides in radial oriented centre position (M), in succession be provided with at least two nozzle row (4) on the described direction of motion (5), and the injecting time point of described ink droplet (9) also depends in the transporting rail of described container (1) and the spacing between described centre position (M), at nozzle row (4) and the spacing between described centre position (M) and described container (1) radius (r separately separately
x) adjusted.
5. according at least one described method in the claims, wherein, in succession be provided with at least two nozzle row (4,4 ') on the described direction of motion (5), and described nozzle row staggers transverse to the direction of motion, half of the printed resolution particularly staggered separately along described nozzle row or 1/3rd.
6. according at least one described method in the claims, wherein, described surface (2) is in front rotation axis (the 1 ') motion that rotates of described nozzle row (4,4 '), and described print gap (6 ') 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 stencil (8) for controlling described at least one nozzle row (4,4 ') on the expanding unit of described all sides (7).
8. according at least one described method in the claims, wherein, described nozzle row (4,4 ') is moved along described surface (2), and the face that described print gap can launch about at least one defines, the described face that can launch is parallel to the axis of symmetry ground orientation of object to be printed.
9. according at least one described method in the claims, wherein, adjust as follows the injecting time point,, the picture point of the former figure of printing (12) under making is in the upper upper or contrary described direction of motion (5) passing in the described direction of motion (5) of printing stencil (8), and the picture point based on having passed is controlled described at least one nozzle row (4).
10. method according to claim 9, wherein, be provided with intermediate noxzzle capable (4 ') at the main shaft (1 ') about described container (1) on radial oriented centre position (M), and the picture point that in the described intermediate noxzzle capable picture point of attaching troops to a unit is compared the nozzle row (4) of attaching troops to a unit before or after being positioned at about the described direction of motion is not passed about the described direction of motion (5) or is less passed on described printing stencil (8).
11., according at least one described method in the claims, wherein, the injecting time point of described ink droplet (9) mates with the protruding or recessed bending radius arranged along container circumference (2 ").
12., according at least one described method in the claims, wherein, described print gap (6) is between 0.5 to 20mm, especially between 1 to 7mm.
13. according at least one described method in the claims, described method also comprises that it comprises as follows step by step for setting up the step of printing stencil (8): default pattern grid (11) is put on described surface to be printed (2); To print former figure (12) gridding based on described pattern grid; The former figure of the printing of gridding is projected to at least one face that can launch (7) upper, in order to assign the printing coordinate to the picture point of the projection of the former figure of described printing on the expanding unit of described.
14. method according to claim 13, wherein, by the former figure of the printing of described gridding (12) project at least one week side (7) upper, and projection source (10) is positioned on the rotation (1 ') of described all sides.
15., according to the described method of claim 13 or 14, wherein, implement by the three-dimensional computations model on described surface (2) to be printed for the step of setting up described printing stencil (8).
16. at container, particularly PET bottle or vial, curved surface (2) on carry out ink jet printing device, it has:
-transverse to or favour at least a line (4,4 ') inkjet nozzle (4a) that print direction (5) is arranged;
-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,, make it possible to spray ink droplet (9) at following time point, described time point depends on the nozzle print gap (6,6 ') separately of injection and is adjusted for each ink droplet.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011086015.0 | 2011-11-09 | ||
| DE102011086015A DE102011086015A1 (en) | 2011-11-09 | 2011-11-09 | Method and apparatus for ink jet printing on curved object surfaces |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103144442A true CN103144442A (en) | 2013-06-12 |
| CN103144442B CN103144442B (en) | 2016-05-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210599072.3A Active CN103144442B (en) | 2011-11-09 | 2012-11-09 | For the method and apparatus that carries out ink jet printing on bending vessel surface |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2591917B2 (en) |
| CN (1) | CN103144442B (en) |
| DE (1) | DE102011086015A1 (en) |
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| CN114555377A (en) * | 2019-07-08 | 2022-05-27 | 弗朗茨.诺霍费尔 | Method for digitally printing profile strips |
| CN114555377B (en) * | 2019-07-08 | 2023-05-23 | 弗朗茨.诺霍费尔 | Method for digitally printing profile strips |
| CN111439031A (en) * | 2020-05-13 | 2020-07-24 | 苏州新锐发科技有限公司 | Printing apparatus and method |
| CN112497932A (en) * | 2020-11-28 | 2021-03-16 | 上海景定电子科技有限公司 | Method for improving digital printing precision of cylinder |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP2591917B2 (en) | 2018-09-19 |
| DE102011086015A1 (en) | 2013-05-16 |
| EP2591917B1 (en) | 2014-12-17 |
| EP2591917A1 (en) | 2013-05-15 |
| CN103144442B (en) | 2016-05-25 |
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