CN103391846B - Prepare the method for flexographic features - Google Patents
Prepare the method for flexographic features Download PDFInfo
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- CN103391846B CN103391846B CN201280009484.5A CN201280009484A CN103391846B CN 103391846 B CN103391846 B CN 103391846B CN 201280009484 A CN201280009484 A CN 201280009484A CN 103391846 B CN103391846 B CN 103391846B
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- flexographic
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- features
- feature
- printing
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/02—Engraving; Heads therefor
- B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
- B41C1/05—Heat-generating engraving heads, e.g. laser beam, electron beam
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Or Reproduction Of Printing Formes (AREA)
- Printing Plates And Materials Therefor (AREA)
Abstract
The preparation of flexographic features (60) comprises the camegraph providing digital picture and calculate based on digital picture.At least one stress sensitive borderline region (11) adjacent at least one characteristics of image is identified, and camegraph is created within flexographic features.The degree of depth (18) adjacent to the base surface area at least partially (10) of at least one characteristics of image is deepened, to provide the base surface area of correction.
Description
Technical field
The present invention relates generally to flexographic printing, and particularly relates to the method preparing flexographic features.
Background technology
Flexography is so a kind of printing process, and it is often used in the Large Copacity letterpress number of times on multiple stock, and described stock is paper, accumulation cardboard, corrugated board, thin polymer film, label, paper tinsel, fabric and laminates such as.Flexographic printing is especially applied to packaging industry, and at described packaging industry, flexographic printing has replaced intaglio printing and lithographic plate offset printing in many cases.
Flexographic printing elements is sometimes referred to as " letterpress parts " and be provided with protruding camegraph, and prepared Chinese ink is applied on described camegraph, to be applied on the receiver element of certain type.The camegraph of described projection is by inking, and on the contrary, embossment " bottom surface " remains inkless.This flexographic printing elements (such as flexographic printing plate) is supplied to user as so a kind of object, and described object has the one or more layers optionally on stock or base material.The flexographic printing plate and flexographic print cylinder or seamless steel tube enforcement flexographic printing with required camegraph can be used.
Usually, flexographic printing elements is made up of photosensitive resin or elastic caoutchouc.The photomask having picture pattern can be placed on the top of photosensitive resin sheet material, and (being generally ultraviolet) is with the exposed portion of crosslinked resin under the mask resin generated is exposed to light, next in video picture process, unexposed (uncrosslinked) part of resin is rasterized liquid and washes off.Recent development has been introduced as CTP (the direct making sheet of the computer) method that photosensitive resin forms mask.Under this approach, thin (thickness is roughly 1-5 μm) light-absorbing black layer is formed on the surface of photosensitive resin plate, and the printed panel generated is become image eradiation by infrared laser, thus masking part directly on Ablative resin plate and without the need to preparing mask individually.In such systems, only mask is ablated and can not ablation photosensitive plate precursor.Subsequently, photosensitive plate precursor is exposed to ultraviolet light with becoming image through the ablated area of mask, with the exposed portion of crosslinked (or sclerosis) photosensitive resin, next in video picture process, unexposed (uncrosslinked) part of resin and remaining black mask layer are rasterized liquid and wash off.These two kinds of methods all relate to video picture process, the large quantity of fluid that described video picture process needs use to need subsequently to be processed and solvent.In addition, the limited efficiency of manufacturing flexible version printed panel is in making the additional drying time removing video picture liquid and the described plate of drying needed for described plate video picture.The additional step of later stage UV-irradiation or other process is often needed to be imaged the surface of printed panel with sclerosis.
Although along with technology maturation, significantly improved by the quality of the object using flexographic printing elements printing, the physics relevant to the process forming camegraph in printing unit limits still to be existed.
In flexographic process, the flexographic printing elements with the three-dimensional camegraph formed in print surface is pressed against inking unit (normally anilox roll), provides prepared Chinese ink with the most end face to camegraph.Inking elevated regions is pressed against the suitable stock be arranged on impression cylinder subsequently.Because flexographic printing elements and anilox roll or stock are mechanically adjusted or limit, the height of described most end face determines the amount of the physics embossing pressure between flexographic printing elements and anilox roll or between flexographic printing elements and stock.The elevated regions higher than other in camegraph will produce the impression effect being greater than lower region or even recessed region.Therefore, flexographic process is extremely sensitive in the embossing pressure that may affect synthetic image.Thus, embossing pressure must be carefully controlled.If embossing pressure is too high, so some image-region can be extruded and distortion, and if embossing pressure is too low, prepared Chinese ink transmission is inadequate again.In order to provide required image, printing worker can to given flexographic printing board test embossing pressure facilities.
Especially, be difficult to use flexographic printing elements printing to have the graph image of meticulous site, line, even word.In the brightest area (being commonly referred in " high light portion ") of image, image density is by all region representations of the printing net-point in the halftone screen of performance continuous-tone image.For amplitude modulation (AM) screening, this relates to the multiple halftone screen points be positioned on fixing periodicity grid is retracted to very little size, and high light portion density is by halftoning site region representation.For frequency modulation (FM) screening, the size of halftoning site roughly maintains certain fixed value, and the quantity representative image density of the halftoning site of random or pseudo-random placement.In both cases, the very little dot size of printing is needed to represent region, high light portion with clear.
Due to the characteristic of board manufacturing process and the small size of halftoning site and deficient in stability, flexographic printing elements remains little halftoning site very difficult.Numeral flexographic printing precursor has the uvioresistant type mask layer of one usually, and described mask layer is coated in above photopolymer in camegraph or photosensitive layer.In imaging in early stage (or later stage imaging) step, the bottom surface of the camegraph in printing unit is arranged in the region of ultraviolet light by the backside exposure from printing precursor.Photopolymer is hardened to the relief depth needed for best printing by this exposure process.After this step with the selective ablation mask layer of high power laser that can process image, opaque in the pattern mask of ultraviolet (UV) light to be formed in non-ablated area.Then the flood exposure (floodexposure) under image forming ultraviolet radiation and chemical process is implemented, to make not to be exposed to ultraviolet region by using video picture solvent or being removed in processing unit (plant) by heating and wicking process.Mask and UV-irradiation combine the embossment halftoning site producing general conical.Minimum being easy in these halftoning sites is removed between processing period, does not have prepared Chinese ink to be passed to these regions (halftoning site is not by " maintenance " or be formed on printed panel or printing machine) during this means printing.Alternately, if little halftoning site still exists after processing, they are also easy to impaired under stress.Such as, little halftoning site folded or part during printing of being everlasting fractures, thus causes prepared Chinese ink to be passed too much or do not have prepared Chinese ink.
Prepare nonnumeric flexographic printing plate traditionally in accordance with similar procedure; except one mask is substituted by free standing film type mask or " photosensitive instrument (photo-tool) ", described free standing film type mask or " photosensitive instrument " coverlet alone become picture and are placed on contacting flexographic printing precursor below the vacuum frame for image forming Ultraviolet radiation.
The solution overcoming above-mentioned high light portion problem is during printing, set up minimum halftone screen spot size.This minimum halftone screen spot size even as big as still existing after the process, and must can stand squeegee pressure.Once this desirable halftone screen spot size is determined, " protuberance (the bump) " curve size of lower halftone screen point value being increased to minimum halftoning site facilities just can be formed.But this causes the loss of details in dynamic range and high light portion and region, dark portion.Generally speaking, the tone in image and details tail off.
Thus, it is well known that, to can reliably to be represented on flexographic printing elements and the minimum dimension being printed onto the halftoning site on receiver element is subsequently conditional.Actual minimum dimension will change according to many factors, and described many factors comprises the printing type of flexographic printing elements, prepared Chinese ink, imaging-device characteristics and the other factors comprising used particular printer for printing etc.When using traditional AM screening, this can have problems in region, high light portion, because once reach minimum halftone screen spot size, further size reduces roughly to produce not expected consequence.Such as, if correspond to 5% tone under the screen resolution of 114 lpi lines per inch, the minimum dimension halftoning site that can be printed is the square site of 50 × 50 μm, so will become the extremely difficult tone be replicated in credibly between 0% and 5%.Usual design for this problem increases the high light portion value in original document, to guarantee that all tone values in file are replicated as printing net-point and are correctly formed on printing unit after imaging and processing.But the shortcoming of this mode is the additional Dot gain (dotgain) generated in high light portion, this causes obvious transition between inking and non-inking region.
Other the known practice mode improving high light portion can by using as United States Patent (USP) 7, and " Respi " described in 486,420 (McCrea etc.) or " two point (doubledot) " screening realizes.When being applied to flexographic printing, the problem of such screening technology is, may be in fact very large by the size of the halftoning site of isolated printing, and general diameter is at 40-50 μm.Even if when using this technology, high light portion is also difficult to copy under the condition not having grainy appearance, when halftoning site be spaced far to represent low-down density time will form grainy appearance (grainyappearance), and printed halftoning site also may have less desirable Dot gain.
U.S. Patent No. 7,486,420 disclose flexographic plate screening technology, and it, by optionally placing non-printing site or the pixel of site, close high light portion, compensates the characteristic printing issues in region, high light portion.Described non-printing site or pixel make printing embossment bottom surface in region, high light portion protruding, thus printing images feature can provide additional support in limit.This technology allow characteristics of image by one or more less non-printing feature around, think the support base that characteristics of image provides extra.Although this mode is the important advance of this area, also can not grainy appearance always completely in removal of images.
MAXTONE screening (EastmanKodak company) is a kind of known hybrid AM screening solution, and what it overcame some high light portions and dark portion copies restriction.MAXTONE screening software allows operator to arrange minimum dot size, to prevent from forming for flexographic plate medium the halftoning site of Yan Tai little.In order to extend tone range, MAXTONE screening software uses the technology of similar FM screening in high light portion and darkness.In order to form brighter darkness, site is removed in random pattern.By producing brighter color with the halftoning site of less (instead of less), the high light portion details of improvement and more durable flexographic printing plate can be obtained.But, resolution ratio and edge fidelity that site must reduce the printing images generated is removed completely from high light portion.
U.S. Patent No. 5,892,588 and No.6,445,465 (inventor is Samworth) describe so a kind of apparatus and method, they are for the production of the halftone screen with multiple halftoning site, described multiple halftoning site by deleting several halftoning site and with required screen resolution array in each unit area, to obtain the gray scale under default gray scale.
Especially when embossing pattern is formed by laser engraving, the subproblem copying site, high light portion is caused by (undercut) or " nature " depressed phenomenon that caves in, wherein due to the details of laser engraving process, the most end face of minimal characteristic is just in time formed in the below of the most end face of flexographic printing plate.This region is not in " having a mind to " depression, and wherein laser brightness is used on purpose to reduce the horizontal plane of the most end face of camegraph feature.Term " nature " or " naturally " mean and inevitably cave in and be dependence system, because improve along with the laser-light spot size of carving motor and resolution ratio, the characteristic size that " nature " caves in will be less.
The printing unit of direct engraving generally can due to the high light portion of depression loss.Being described in the document of " DirectLaserPlateMakingConsiderationforCurrentStatus " by name disclosed in 1 day February in 2010 by Japanese flexographic printing TIA uses depression to discharge the squeegee pressure in region, high light portion when preparing flexographic printing plate.Fig. 7 of described document illustrates along with characteristic size reduces, the progressive depression in camegraph.If depression is little, the embossment be in so on the printer under pressure meets expectation, but when depression makes too greatly, printing quality can be affected.
The open text No.2009/0223397 (Miyagawa etc.) of the U.S. describes the device by using the luminous energy of light beam to form the protrusion site of direct engraving on flexographic printing plate, the adjacent area that the luminous energy engraving all or part of described light beam is adjacent with the projection becoming to protrude shape to be maintained on recording medium surface, the luminous energy of described light beam is equal to or less than critical engraving energy, and the region place near the outside of adjacent area, the luminous energy of light beam is increased to the grade higher than the luminous energy used in described adjacent area.This can help the seriousness reducing depression by the exposure being limited in characteristic top, but also can not eliminate the problem of the meticulousst engraving feature of expectation.
Jointly transfer the co-pending U.S. Patent application serial no No.12/868 of the applicant, 039 proposes to regulate (engagementmodulation by being combined AM, FM screening and being connected, EM) address this problem, wherein subregion has the site all with minimum receiver element contact area, and wherein a part for site has most end face, but prepared Chinese ink can be delivered to above the horizontal plane on printing machine in the below of the most end face of elasticity by described most end face.This method can form more level and smooth tonal scale, but can be sensitive to the modification being connected and regulating for different printing machine conditions.
In addition to these problems, also have multiple figure interimage effect, described figure interimage effect produces close to " naturally " is recessed to other fine-feature of other characteristics of image (such as solid line, line and word) due to site, high light portion.Such as, in site, high light portion adjacent to solid line or line or by line around field, a row or multi-row meeting of the site of immediate vicinity feature loses density in printing receiver or can not overall printing, thus causes unexpected unevenness.
When fine rule is near solid line, word or similar characteristics, can observe other figure interimage effect can.In this case, be intended to straight line nearby to show as around feature and be twisted.Described line can show as be bent, thicker or attenuate.
When elongated area adjacent to background, the field of site, high light portion the region of print characteristics (do not have can), between image, defect also can occur.In this case, last row adjacent to border of site or last a few row often print darker than the average site in field, and show more Halo effect.
Although for improving the picture quality in region, high light portion, flexographic printing has obtained a lot of progress, but still the expression effect of the little halftoning site needing to improve in printing flexographic plate image and fine rule, to improve image detail and to reduce Dot gain video picture.
Summary of the invention
In brief, according to an aspect of the present invention, the preparation of flexographic features comprises provides digital picture and base to calculate camegraph in described digital picture.Borderline region adjacent at least one stress sensitive of at least one characteristics of image is identified, and described camegraph is created within flexographic features.The degree of depth adjacent to the base surface area at least partially of at least one characteristics of image described is deepened to provide the base surface area of correction.
According to a further aspect in the invention, the method preparing flexographic printing elements comprises the step forming camegraph, and described camegraph is at least made up of the region of feature roughness, but also can comprise the meticulous region of feature.According to the program determined by picture material, add the cutting part of high relief at boundary.
The invention provides a kind of method of flexographic printing elements for the preparation of prepared Chinese ink to be passed to receiver element from image-region, described flexographic printing elements comprises camegraph and camegraph bottom surface, and described camegraph has the image-region be made up of the elastic component with the most end face of elasticity.Described method comprises the additional step forming the step of camegraph and the cutting part of engraving intensification camegraph aspect by Direct Laser engraving.Before the step of adding these cutting parts can occur in and form embossing pattern, period or afterwards.Described cutting part is intended to improve defect between image, and between described image, defect is due to the unexpected Stress transmit in flexographic features on the printer during printing operation.The cutting part adding high relief can realize these objects and without the need to significantly increasing the burden that exposure energy, material collection and the material relevant with the whole bottom surface embossment of intensification flexographic features are cleared up.
The details of the preferred embodiment by following displaying describes and becomes more apparent by the present invention and object thereof and advantage.
Accompanying drawing explanation
Fig. 1 a is schematic cross sectional views, shows comparative flexographic features or the sleeve with rough features and bottom surface.
Fig. 1 b is the schematic cross sectional views of embodiments of the present invention, and the cutting part adding high relief adjacent at least one characteristics of image is shown.
Fig. 2 a is the schematic cross sectional views of showing comparative flexographic features or sleeve, and the inclined wall adjacent at least one rough features region is shown.
Fig. 2 b is the schematic cross sectional views that flexographic features of the present invention or sleeve are shown, it has adjacent to the inclined wall at least one rough features region and the cutting part adding high relief adjacent to described rough features region.
Fig. 3 a is the schematic cross sectional views that comparative flexographic features or sleeve are shown, it has the fine-feature adjacent to rough features.
Fig. 3 b is schematic cross sectional views of the present invention, and the cutting part adding high relief between coarse and fine-feature is shown.
Fig. 4 is the explanatory view of the laser carving device for implementing step of the present invention.
Detailed description of the invention
The present invention will especially be intended to these elements, and they are formed according to a part for device of the present invention or more directly coordinate with described device.It should be understood that these elements not illustrating especially or describe can be the various forms known to those skilled in the art.
Definition
The various term used in this application with lexical or textual analysis of giving a definition and phrase, to limit the present invention.Unless otherwise stated, these definition are intended to other definition getting rid of described term or the phrase that may find in the prior art.
Term " flexographic printing precursor " refers to so a kind of material, and it is for the preparation of flexographic printing elements of the present invention, and form can be flexographic printing plate front body, flexographic print cylinder precursor and flexographic print cylinder precursor.
Term " flexographic printing elements " or " flexographic features " refer to these objects of the present invention, they are imaging flexographic version printing precursors, and form can be the printed panel of the most end face of elasticity with substantially flat or have printing cylinder or the seamless printing sleeve of the most end face of the elasticity of flexure.When using sleeve and cylinder, yes for height and datum-plane with reference to radial direction.
Term " receiving element " refer to can the application of the invention flexographic printing elements and with prepared Chinese ink printing any material or stock.
Term " ablation (property) " relates to the composition or layer that can be imaged by use radiation source (such as laser), described radiation source produces heat in layer, described heat causes the quick local in described composition or layer to change, to make to be imaged region and residual components or layer physical separation and to discharge from described composition or layer.
" ablation imaging " is also referred to as " ablation engraving ", " laser engraving " or " direct engraving ".
" the most end face of elasticity " refers to the outmost surface of elastic component or layer, and camegraph is formed in described outmost surface, and the most end face of described elasticity is the first surface shone through by image-forming radiation source.
Term " camegraph " refers to all shape characteristics of flexographic printing elements, and it is arranged by imaging process and is designed to the pattern with prepared Chinese ink to pass to receiving element.
Term " image-region " refers to the predeterminable area of the camegraph in elastic component, and described predeterminable area is designed to by inking and on receiving element, arranges corresponding inking image-region.
Term " camegraph bottom surface (layer) " or " bottom surface (layer) " refer to the most bottom surface of camegraph, and any cutting deepened by embossment limited as the present invention is got rid of in described most bottom surface.Such as, described bottom surface can be considered to the depth capacity of camegraph from the most end face of elasticity, and generally can between the scope of 100 to 1000 μm.Camegraph roughly comprises multiple " trough ", and they are not by inking and the degree of depth being less than described depth capacity had from the most end face of elasticity.
As used herein, term " site " refers to be formed in the shaping projection in the camegraph in flexographic printing elements of the present invention or microstructure.This site is called " halftoning site " by some open texts.Term " site " not refers to the net-point shape printing images be arranged on by the site on flexographic printing elements on receiving element.But the site surf zone be desirably on flexographic printing elements can as closely as possible corresponding to the net-point shape image be printed on receiving element.Minimum dot size is determined by for the manufacture of the described laser beam of minimum site and the characteristic of printed motor usually, and the most end face of the site being less than described minimum dot size in camegraph generally below the original non-sculpture surface of flexographic printing elements is formed.This situation is called as depression or " nature " depression.Suppose to use current best engraving system, so can be about 30 μm for the current estimation of minimum dot size and be multiplied by 30 μm or 900 μm
2but along with systemic resolution improves, the less feature not being subject to nature depression also can become feasible.
Term " fine-feature " refers to a kind of so any camegraph feature being intended to prepared Chinese ink to be passed to receiver, it is by " naturally " depression, thus comprise such as following characteristics: halftoning site, independent site, fine lines, ting model word or any further feature, due to the restriction of the carving motor for the production of camegraph, the most end face about 30 microns of these features or more lower than the original most end face of the flexographic printing elements of pre-engraving.Fine-feature region is defined by comprising any continuum of flexographic features after the engraving of only fine-feature.
Term " rough features " refers to any camegraph feature being intended to prepared Chinese ink to be passed to receiver, and its most end face can be formed in about 30 microns of the original most end face of the flexographic printing elements of pre-engraving.Rough features region is defined by comprising any continuum of flexographic features after the engraving of only rough features.Thus, all features being intended to prepared Chinese ink to be passed to receiver are all " coarse " or " meticulous " features, and all image-regions of flexographic printing elements can be divided into " coarse " and " meticulous " region.Rough features region and fine-feature region can both comprise have non-can the continuous base surface area of print characteristics.The most end face of base surface area is located at the below of horizontal plane prepared Chinese ink being passed under conventional printing condition flexographic presses.
Fine-feature embossment is defined by any relief features, and it by " naturally " depression, thus comprises such as following characteristics: halftoning site, independent site, fine lines, ting model word or any further feature.Due to the restriction for the production of camegraph direct engraving motor, depression means that the most end face of fine-feature is 30 microns or more lower than the original most end face of the flexographic printing elements of pre-engraving naturally.These features when do not make their most end face cave in 30 microns or initial surface more lower than flexographic printing elements, do not formed by given carving motor.With current state of the art, the shortest general side direction straight line specification of these fine-feature is about 30 microns or shorter.One object of the present invention is intended to avoid or improve because the adverse effect of flexographic printing on the printer occurs depression naturally.Fine-feature region is defined by comprising any continuum of flexographic features after the engraving of only fine-feature.
On the contrary, rough features is that those have the feature of side direction straight line specification, and it is not even as big as when not implementing additional smooth program, guarantees that the most end face of imaging features can be maintained substantially not carved process upset.These features normally the halftoning site of solid line, medium range and shoulder halftoning site, generally there is the wide line of the shortest side direction straight line specification and the relatively large word of about 30 microns or larger.Rough features region is defined by comprising any continuum of flexographic features after the engraving of only rough features.
Collect ablated remains by what make intensive, modulation with the parts surface in the single point of the radiator focused on or multiple laser dot scans image-region, relief features is generally carved into flexographic printing elements.The image-region that laser spots can scan described parts once or for several times, to control ablation depth.Each scanning is commonly called together.During per pass, the relief image pattern of all or part can process with default laser brightness with becoming image, affects ablation depth with each position in final camegraph.
Resulting from the border of cutting part to a great extent is generally formed between rough features region and base surface area or is formed between rough features region and fine-feature region.The position that these borders stress is on the printer transmitted by flexographic features is formed, thus causes distortion and cause less desirable figure interimage effect (inter-imageeffect) in printing.These interfaces are called stress sensitive border.There is the stress sensitive border of a few types.Such as, when the field of high light portion or semi-tone site is adjacent to extension base surface area, nets a row or multi-row more heavily printing the in outside site portion, and show more Halo effects than the site away from border.This is called as the stress sensitive border of floor interface.The extension (or sole length) of base surface area refer to stress sensitive border and next recently can beeline between print characteristics, and determine the seriousness of defect.Modeling and printed data show, the extension base surface area being short to 2mm is in-problem for stress sensitive border, and become more serious along with distance increases described problem." add the cutting part of high relief " or " cutting part " refer to the intensification carving depth of base surface area a part or between the point of the boundary adjacent at least one characteristics of image of stress sensitive boundary (inter-dot) embossment.
The stress sensitive border being called as approximation space interface of another kind of type is formed between rough features region and fine-feature region.In this case, modeling and printed data show, stress sensitive border causes fine-feature finally a row or multi-row compared with the fine-feature further from border near interface, and printing closeness is less or not intensive.
Also can form the stress sensitive border of other type, thus cause mistake between the image in printed matter.Fine rule such as close to word can show as wave or narrow, thus shows the stress sensitive border between these features.Figure interimage effect can show as Density inhomogeneity or feature placement error.Can reduce or eliminate this problem at the cutting part of these stress sensitive boundaries.
Flexographic printing elements
Flexographic printing elements prepared by the application of the invention can be the seamless steel tube having the flexographic printing plate of any suitable shape, flexographic print cylinder or slide on printing cylinder.
Elastic component for the preparation of useful flexographic printing precursor is described at multiple open text, includes but not limited to U.S. Patent No. 5,719,009 (Fan); No.5,798,202 (Cushner etc.); No.5,804,353 (Cushner etc.); With WO2005/084959 (Figov), all these open texts are bonded to by reference herein in the instruction of the configuration of laser ablatable material and flexographic printing precursor.Usually, elastic component comprises cross-linked elastomer or vulcanized rubber.
DuPont company
fAST
tMthermal mass transfer plate be the flexographic printing plate front body of the photosensitive resin that market can have been bought, it comprise integrated can ablation mask element, and need minimum chemical process.These elements can be used as flexographic printing precursor in the practice of the invention.
Such as, the laser ablatable type that flexographic printing precursor can comprise self-supporting maybe can carve type relief moulding layer (by hereafter defining), and described relief moulding layer comprises the elastic component forming rubber or elastic layer.This layer does not need independent substrate to have physical integrity and intensity.Under this embodiment, the relief moulding layer of the laser ablatable be made up of elastic component is enough thick, and laser ablation is controlled in such a way, and namely the camegraph degree of depth is less than integral thickness, such as reaches as high as 80% of the integral thickness of described layer.
But in other embodiments, flexographic printing precursor comprises that have into image side and non-imaged side, that suitable specification is stable laser can not carve type substrate.Substrate has at least one laser be arranged in on image side can carve type relief moulding layer (being formed by elastic component).Suitable substrate includes but not limited to the laminates (laminates of the laminates of such as polyester and aluminum sheet or polyester/polymer layer compound or polyester film and flexibility or the supporter that bonds) of thin polymer film, aluminum sheet or cylinder that specification is stable, transparent foaming, pottery, fabric or thin polymer film (come from compression or add polymer) and metal sheet.Usually use polyester, Merlon, vinyl polymer and polystyrene film.Useful polyester includes but not limited to gather (ethylene glycol terephthalate) and poly-(polyethylene naphthalate).Substrate can have any suitable thickness, but the thickness of described substrate is roughly at least 0.01mm or more preferably from about 0.05 to about 0.3mm (especially polymerizable substrate).Tack coat may be used for elastic component to be fastened to substrate.
The non-imaged side (if exist) of substrate can have laser can not ablative-type protective coating priming coat (backcoat), described priming coat can be made up of soft rubber or foam or other flexible layer.This priming coat can be rendered as to be provided the cohesive between substrate and printer roller and provides extra flexibility to the printing unit generated or reduce or control the curling of printing unit.
Thus, flexographic printing precursor comprises one or more layer.Except laser can carve type relief moulding layer, can also have can not ablative-type protective coating elastic rubber layer (such as, bed course) at substrate and the laser formed between top elastic component that laser can carve type relief moulding layer.
Generally speaking, the thickness that the laser be made up of elastic component can carve type relief moulding layer is at least 50 μm and preferably from about 50 to about 4,000 μm or more preferably from 200 to 2,000 μm.
Elastic component comprises high polymer cemented dose of one or more laser ablatable, such as cross-linked elastomer or rubber resin (such as vulcanized rubber).Such as, elastic component can comprise one or more thermosetting or thermoplastic polyurethane resin, and it is from the reaction of polyalcohol (such as polymer diol or triol) and polyisocyanates, or being obtained by reacting from polyamine and polyisocyanates.At other embodiment, elastic component comprises the thermal booster reaction product of thermoplastic elastomer and polyfunctional monomer or oligomer.
Other elastic resin comprises the copolymer of styrene and butadiene, isoprene and cinnamic copolymer, SBS, styrene-isoprene-styrene copolymer-, other polybutadiene or polyisoprene elastomer, nitrile elastomer, polychlorobutadiene (polychloroprene), polyisobutene and other butyl elastomers, comprise chloro-sulfonated polyethylene, polysulfide, any elastomer of polyalkylene oxides (polyalkyleneoxides) or polyphosphazene, the elastomeric polymer of (methyl) acrylate, elastic polyester, and other similar polymer known in the art.
Also have other useful laser can carve resin and comprise vulcanized rubber, such as EPDM (ethylene-propylendiene rubber), acrylonitrile-butadiene rubber (Buna-N), natural rubber, neoprene (Neoprene) or chloroprene rubber, silicone rubber, fluorocarbon rubber (fluorocarbonrubber), fluorosioloxane rubber, SBR (SBR styrene butadiene rubbers), NBR (acrylonitrile-butadiene rubber), ethylene-propylene rubber, and butyl rubber.
Having other useful laser can carve resin is again such polymeric material, after being heated to 300 DEG C with the speed of 10 DEG C/min (usually under a nitrogen), lose its quality of at least 60% (usually at least 90%) and form discernible low molecular weight product, this product has the molecular weight of 200 or lower usually.These laser can the particular instance of material for carving on it include but not limited to gather (cyanoacrylate), it comprises from the derivative repetitive of at least one alkyl-2-cyanoacrylate monomer, and its in ablation process, form those monomers be main low molecular weight product.These polymer can be single cyanoacrylate monomer homopolymers or derived from the copolymer of one or more different cyanoacrylate monomers with the optionally undersaturated polymerisable monomer of other ethylenic, the undersaturated polymerisable monomer of this ethylenic such as (methyl) acrylate, (methyl) acrylamide, vinyl ethers, butadiene, (methyl) acrylic acid, vinyl pyrimidine, vinyl phosphonate, vinyl sulfonic acid and styrene and styrene derivative (such as AMS), condition is that non-cyanoacrylate comonomer does not suppress ablation process.Can be alkylcyanoacrylate, alkoxyl cyanoacrylate and alkoxyalkyl cyanoacrylate for providing the monomer of these polymer.The representative embodiment of poly-(aminoacrylic acid vinegar) includes but not limited to gather (alkylcyanoacrylate) and poly-(alkoxyalkyl cyanoacrylate), such as poly-(methyl-2-cyanoacrylate ester), poly-(ethyl-2-cyanoacrylate), poly-(methoxy ethyl-2-cyanoacrylate), poly-(ethoxyethyl group-2-cyanoacrylate), poly-(methyl-2-cyanoacrylate-copolymerization-ethyl-2-cyanoacrylate), and be described in United States Patent (USP) 5, other polymer in 998,088 (Robello etc.).
In other embodiments, the elastic composition that laser can be carved can comprise Merlon or the polycarbonate block copolymer of alkyl replacement, and it forms cyclic alkylene carbonate as main low molecular weight product in the depolymerisation from engraving.Merlon can be unbodied or lenticular, and available from multiple commercial source, can comprise AldrichChemicalCompany (Milwaukee, WI).Representative polycarbonate is described in such as United States Patent (USP) 5,156,938 (Foley etc.), in 9-12 hurdle.These polymer can available from multiple commercial source or the synthetic method using oneself to know preparation.
In other embodiments, the polymer adhesive (binder) that laser can be carved is Merlon (tBOC type), and it forms glycol and diene as main low molecular weight product by depolymerisation in laser engraving process.
The elastic composition that laser can be carved generally includes at least 10 % by weight and at the most 99 % by weight, and the elastomer that can carve of the laser of usual 30 to 80 % by weight or vulcanized rubber.
In some embodiments, in make inertia microcapsules be dispersed in polymer adhesive that laser can carve.Such as, microcapsules can be dispersed in polymer or polymer adhesive, or are dispersed in crosslinked elastomer or rubber resin." microcapsules " also can be called " hollow bead ", " microballoon ", " microvesicle ", " micro-balloon ", " porous globule " or " porous granule ".These components generally include thermoplastic polymer shell and air core body or volatile liquid such as isopentane and iso-butane.These microcapsules can comprise multiple interconnective or unconnected space of single centronucleus or core inside.Such as, microcapsules can as being described in United States Patent (USP) 4,060,032 (Evans) and 6,989, those in 220 (Kanga) are designed, or according to such as United States Patent (USP) 6,090,529 (Gelbart) and 6, plastics micro-balloon is designed to described in 159,659 (Gelbart).
The relief moulding layer that the laser be made up of elastic composition can be carved also can comprise one or more infrared radiation absorption compounds, and the IR that this compound absorbs in 750 to 1400nm or usual 750 to 1250nm scope irradiates and exposure converting photons is become heat energy.Useful especially infrared radiation absorption compound is to being exposed to IR laser-sensitive.If needed, the mixture of the infrared radiation absorption compound of identical or different type can be used.The infrared radiation absorption compound of wide region can be used for the present invention, this compound comprises the organic or inorganic colorant (the sour cyanogen in side (squarylium), cyanine, merocyanine element, indolizine, pyralium salt, metal phthalein cyanine and metal dithionite synthetic fibre (dithiolene) pigment) of carbon black and other IR absorption, iron oxide and other metal oxide.
Other useful IR irradiation absorption compound comprises the carbon black with solubilizing group functionalisation of surfaces well known in the art.Be grafted to the carbon black of hydrophily, non-ionic polymers, such as FX-GE-003 (being manufactured by NipponShokubai), or with the carbon black of anionic group functionalisation of surfaces, such as
200 or
300 (being manufactured by CabotCorporation) are also useful.Other useful colorant includes but not limited to: phthalein viridescent (HeligenGreen), oil black nigrosine (NigrosineBase), iron oxide (III), transparent ferric oxide, magnetic colorant (magneticpigments), manganese oxide, Prussian blue (PrussianBlue) and Paris blue (ParisBlue).Other useful IR irradiation absorption compound is CNT (such as the CNT of single wall and many walls), graphite, Graphene and porous graphite.
Other useful infrared radiation absorption compound (such as IR dyestuff) is described in United States Patent (USP) 4,912,083 (Chapman etc.), 4,942,141 (DeBoer etc.), 4,948,776 (Evans etc.), 4,948,777 (Evans etc.), 4,948,778 (DeBoer), 4,950,639 (DeBoer etc.), 4,950,640 (Evans etc.), 4,952,552 (Chapman etc.), 4,973,572 (DeBoer), 5,036,040 (Chapman etc.) and 5, in 166,024 (Bugner etc.).
Optional additives in the elastic composition that laser can be carved can include but not limited to: plasticizer, dyestuff, filler, antioxidant, antiozonant, stabilizing agent, dispersing aid, surfactant, for the dyestuff of color controlling or colouring agent, and adhesion promotor, condition is that they do not disturb carving efficiency.
Flexographic printing precursor can be formed to provide elastic composition by the formula comprising coating solvents, one or more elastomer resins and infrared radiation absorption compound.This formula can be shaped as self-supporting layer or be administered on applicable substrate.These layers can be formed in any suitable manner, such as, by a series of formula being injected, spraying, or be poured on substrate.Alternatively, this formula pressing mold, injection molding, melt extrusion, co-extrusion pressure or melt calendering (meltcalendared) can be become applicable layer or ring (sleeve) and is optionally adhered to or is laminated to substrate and harden with shaping layer, plane or by the thin slice in face, or seamless printing sleeve.The flexographic printing precursor of sheet form can be wrapped in the surrounding of printing cylinder and melt to form seamless printing precursor in edge.
Form the method for flexographic printing elements
Ablation or engraving energy can be applied in by using suitable laser instrument, described laser instrument such as CO
2the array of infra-red radiation diode or YAG laser or these laser instruments.Ablation engraving is at least 100 μm or generally from the camegraph of 300 to 1000 μm for providing the minimum bottom surface degree of depth.But the Local Minimum degree of depth between each halftoning site can be less.When there is substrate, the depth capacity of camegraph can be up to laser can carve the original thickness of type relief moulding layer about 100%.Under these conditions, the bottom surface of camegraph can be substrate (layer is removed in the image area completely if laser can carve type relief moulding), laser can carve lower region or the lining (such as tack coat, flexible layer or non-ablative type elasticity or rubber lining) of type relief moulding layer.When substrate does not exist, the depth capacity of camegraph can be up to that the laser comprising elastic component can carve the original thickness of type relief moulding layer 80%.Roughly can use from about 700nm to the laser operations of wavelength of about 11 microns, the laser operations more preferably from 800nm to 1250nm.Laser must have sufficiently high brightness, is approximately adiabatically settled at impulse duration to make the pulse that caused by relative movement or effective impulse.Pulse duration is generally much smaller than 1ms.
Haply, carve by using at least one infra-red radiation laser instrument to be implemented, described infra-red radiation laser instrument has at least 1J/cm at the most end face place of elasticity
2minimum flux level (fluencelevel), and general infrared imaging is from about 20 to about 1000J/cm
2, or more preferably from about 50 to about 800J/cm
2.
Engraving camegraph can occur in different environments.Such as, sheet-like precursor can also use by expectation in imaging, or wraps in before imaging around printing cylinder or roll form.Flexographic printing precursor also can be printing sleeve, and it can be installed to imaging before or after printing cylinder.
During imaging, the product of most engraving removing is gaseous state or volatile, and easily through vacuum collecting with cleaning or chemical treatment.Any solid fragment can use vacuum or washing to collect similarly.
After imaging, if elastomer top surface is still sticky, oneself method known of this area can be used to make the flexographic printing elements of generation stand optional separating step (detacking).
During printing, the flexographic printing elements of generation is by using own perception method by inking, and prepared Chinese ink is suitably delivered to suitable receiving element.
After printing, flexographic printing elements can be cleaned and re-use.Printing cylinder can be scratched or otherwise cleans and re-use on demand.
With reference now to Fig. 1 a, it illustrates comparative flexographic features 60 (such as, plate or sleeve), described flexographic features has the most end face of original flexographic features (or flexographic features surface, top) 30 and bottom surface embossment horizontal plane 20, described flexographic features is the carved embossing pattern of tool also, the stress sensitive border 11 of base surface area extension 10 and floor interface, wherein said embossing pattern has rough features 50, the coarse high light feature 40 of rough features 51 and outside site near next is immediate, coarse high light feature 41, coarse high light feature 42, the coarse high light feature 43 of inner site.Most end face has the dot size 48 of coarse high light feature.In this view, the sidewall of described feature is represented as straight inclined wall, and embossment horizontal plane 8 place has embossment between minimum point between minimum point, but it should be understood that, the sidewall of actual camegraph can be vertical, tilt or bending, maybe can have plateau (plateaus) below the most end face of described feature or any combination of these patterns.With reference to the field of high light feature, the coarse high light feature 40 of outside site represents the site near stress sensitive border, and the coarse high light feature 43 of inner site represents the site farthest away from stress sensitive border.
Sectional view of the present invention with reference to laser emission 100 shown in figure 1b can understand the present invention, described laser emission be used for by carve floor interface the adding high relief 14 of stress sensitive border and optionally revise bottom surface, described in add the width 16 adding high relief that high relief has the stress sensitive border of the floor interface at stress sensitive border 11 place at floor interface.Described rough features has consistent with the most end face 30 of original flexible board parts of the flexographic features 60 before engraving original most end face.The embossment horizontal plane 18 to the bottom surface embossment horizontal plane 20 in final camegraph at least 30 μm that the stress sensitive border of floor interface is carved in laser emission downwards.In this embodiment, the boundary between the coarse high light feature 43 of the coarse high light feature 40 of stress sensitive border 11 in outside site of floor interface, coarse high light feature 41, coarse high light feature 42, inner site and base surface area extension 10 is formed.The degree of depth adding high relief 14 on the stress sensitive border of floor interface is at least 30 μm under the embossment horizontal plane of bottom surface, and the width 16 adding high relief on the stress sensitive border of floor interface is at least 10 μm and is less than next near can the half 19 of total distance of print characteristics.
Fig. 2 a illustrates comparative flexographic features 60, it has the most end face 30 of original flexographic plate plate member and bottom surface embossment horizontal plane 20, the stress sensitive border 11 of described the flexographic features also carved embossing pattern of tool, base surface area extension 10 and floor interface, the embossing pattern of wherein said engraving have rough features 50, next immediate near rough features 51 and the coarse high light feature 40 of outside site, coarse high light feature 41, coarse high light feature 42, inner site coarse high light feature 43.The sidewall at stress sensitive border 11 place at floor interface shown in this representative graph has the non-angled wall 24 printing plateau 12 and Fei Ke printing plateau.
Embodiments of the present invention schematically show in Fig. 2 b that laser emission 100 is shown, described laser emission be used for optionally carve floor interface stress sensitive border add high relief 14, described in add the width 16 adding high relief that high relief has the stress sensitive border of the floor interface at stress sensitive border 11 place at floor interface.At least 10 μm below embossment horizontal plane 18 to the bottom surface embossment horizontal plane 20 on the stress sensitive border of laser emission 100 downward engraving floor interface.The width 16 adding high relief on the stress sensitive border of floor interface is at least 10 μm, and is less than next near can the half 19 of total distance of print characteristics.
Fig. 3 a is the schematic cross sectional views that comparative flexographic features is shown, it has the outside site 70 of rough features 50 and multiple fine-feature, fine-feature site 71, multiple fine-feature site 75, the inner site 77 of fine-feature, described each fine-feature have determined by the top horizontal plane 6 of halftoning netting twine (screenruling) and fine-feature, space 27 between critical to print below horizontal plane 9 for the point transmitting prepared Chinese ink on the printer.Flexographic features shows for having supporting layer 80 and band basic unit 90.The site, inside 77 of the outside site 70 of multiple fine-feature, fine-feature site 71, multiple fine-feature site 75, fine-feature has the dot size 48 of coarse high light feature, described dot size is less than the spot size for laser engraving embossing pattern, and therefore " naturally " is recessed to the critical most top horizontal plane 6 printing fine-feature below horizontal plane 9, and described critical plane causes printing feature that is chaotic or that do not print.The stress sensitive border 13 at approximation space interface illustrates between last a few row and rough features of fine-feature site.The site, inside 77 of fine-feature represents the site farthest away from stress sensitive border, and the outside site 70 of multiple fine-feature represents the site near stress sensitive border.
The representative graph of other embodiment of the present invention, i.e. Fig. 3 b show laser emission 100, it adds high relief 15 for what optionally carve the stress sensitive border at approximation space interface, and described cutting part has the width 17 on the stress sensitive border at the approximation space interface at stress sensitive border 13 place between last a few row and rough features 50 of the site, inside 77 of the outside site 70 of multiple fine-feature, fine-feature site 71, multiple fine-feature site 75, fine-feature.Cutting part by downward engraving to the embossment horizontal plane 26 on the stress sensitive border at the approximation space interface at least 30 μm of places below embossment horizontal plane 8 between minimum point.The width 17 on the stress sensitive border at approximation space interface is at least 10 μm and space 27 between the point do not determined wider than the netting twine by half tone image.
Fig. 4 illustrates the device for the preparation of flexographic printing plate according to the present invention.Flexographic features 60 is installed in the computer rotated by motor 130 and coordinates on drum 110.Driving screw 150 is driven by driving screw motor 155.Print head platform (printheadplatform) 190 is attached to the driving screw 150 making the platform movement being parallel to drum surface.Laser thermal print head 170 is installed in the platform for imaging flexographic version printing unit.Lens 175 make laser emission 100 point to flexographic printing elements.Electrical lead 140 makes each device be connected with computer 160, and the motion of drum 110 and driving screw 150 coordinated by described computer, and the operation of laser thermal print head 170.Remains gathering system 180 is collected and is carved by LASER HEAT the chip produced.There is coarse and camegraph that is fine-feature be formed as described above.
Modeling
The two dimensional model of linear elasticity interacts for the printing of simulating between flexographic features and receiver, and for predicting Dot gain relevant to the side direction specification of the most end face increasing feature under being connected and the Dot gain uniformity.All material is all considered to isotropism.Model does not comprise be known as very important gamma correction for real elastomer, but expects that linear model catches the correct trend paying close attention to phenomenon herein qualitatively under the condition that strain is not too high.Model does not comprise the effect because ink flow produces especially yet, and does not therefore comprise the contribution to the Dot gain observed in actual printed matter or Halo effect.The modification predicted under being also desirably in the stress at the diverse location place in flexographic features will cause scatters similar trend qualitatively to prepared Chinese ink.Find that result meets each printing embodiment well in qualitative.The stress sensitive border of two types as above is studied, and the improvement provided by cutting part is proved to be.
Can the following explanation to model prediction with reference to table herein and view understanding.Unless otherwise mentioned, the unit of all distances is all micron.A problem to be solved represents in table 1 and Fig. 1 a, and the stress sensitive border 11 of the floor interface between the coarse high light feature 43 of the coarse high light feature 40 wherein in outside site, coarse high light feature 41, coarse high light feature 42 and inner site and base surface area is according to base surface area extension 10 modeling.In this case, at dot size 48 place that the most end face of site has a coarse high light feature across row four sites of 50 μm close to embossment be the base surface area of 400 μm at first.In Table 1, the site 40 near stress sensitive border is called as outside site, and is called as inner site farthest away from the site on border 43.Near next is immediate, rough features 51 is (100 μm) at its most end face, and is separated with the stress sensitive border 11 of floor interface by the base surface area with base surface area extension 10 pointed out in table 1.Unlimited finger herein do not have next immediate near the limited case (that is, ad infinitum away from) of rough features 51.Model comprises the supporting layer representing such as polyester support thing and another sublayer (subbinglayer) representing such as tape base (backingtape).The flexographic features 60 of the most thick 1.7mm of end face is subject to the impact of the strain being equivalent to linking 200 microns.Report the dot size calculated under the stress of inside and outside site and the measurement to Dot gain unevenness (NU) provided by following formula in Table 1:
%NU=100 (external dimensions-inside dimension)/inside dimension (1)
Result shows, when not having substance feature to present, unevenness is 4%, and when nearest neighbouring rough features is about 1000 μm far away, unevenness is improved to 2%.Along with the extension of base surface area reduces, unevenness is improved monotonously.At 225 μm of places, unevenness is less than 0. 5 percent.
Table 1: the prediction to dot size and unevenness ining contrast to sole length extension, original net spot size is 50 μm; Initial embossment is 400 μm
Table 2 illustrates when adding high relief 400 μm, cutting part obtainable improvement when stress sensitive boundary is carved of wide 50 μm.In this case, the dot size 48 of the original coarse high light feature before linking is 25 μm, and does not have nearest neighbouring entity (namely unlimited bottom surface extension).When cutting part manufactures at stress sensitive boundary, the non-uniformity calculated is improved to 1.6% from 4.9%, and the multiple of improvement is 3.
Table 2: under stress sensitive boundary exists cutting part and do not have the condition of cutting part, dot size and unevenness prediction; Original net spot size is 25 μm, and initial embossment is 500 μm
Report in table 3 and non-ly print the plateau 12 (improvement of available prediction during see Fig. 2 a) when stress sensitive border comprises.In this case, the dot size 48 of initial raw height light feature is 25 μm, bottom surface embossment is 500 μm and the non-width printing plateau 12 is 50 μm.The width of cutting part is as shown in Figure 2 b 25 μm, and has the degree of depth of showing in table 3.The unevenness calculated never cutting part when 6.7% 0.3% when being improved to 1550 μm of cutting parts.
Table 3: comprising the stress sensitive boundary of plateau, the dot size when there is and do not have cutting part and the prediction of unevenness; Original net spot size is 25 μm, and initial embossment is 500 μm
Table 4 is according to the prediction of dot size and cutting part depth ratio is comparatively thick to 1.2mm and 1.7mm is thick flexographic features.Find that unevenness can be poorer for less site, as observed in real printing machine runs, and this unevenness roughly can be poorer for thinner flexographic features.Modeling illustrates the cutting part improvement non-uniformity at stress sensitive boundary, and cutting part is more dark better.
Table 4: the prediction to unevenness ining contrast to the cutting part degree of depth, original net spot size and flexographic plate plate thickness; Initial embossment is 400 μm
Reference table 5 and Fig. 3 a and 3b describe the problem andsolution of the present invention for the stress sensitive border at approximation space interface.Table 5 shows in rough features 50 before and after linking 150 μm, the displacement of pushing up most between horizontal plane 6 of the initial fine-feature of the site, inside 77 of fine-feature and the outside site 70 of multiple fine-feature.This table reported and is connected unevenness (ENU) and provides as follows as the function of the cutting part degree of depth:
ENU=internal displacement-outside displacement (2)
Displacement and ENU are by the combination calculated for sublayer hardness.First descriptor of the 1st row of table 5 refers to the relative hardness of supporting layer 80, and the second descriptor Zhi Dai basic unit 90.The Young's modulus of flexographic features 60 is 1 (dimensionless units), the Young's modulus of soft formation is 0.1 and hard formation is 10.The width 17 on the stress sensitive border at the approximation space interface shown in table 5 is 20 μm, and the degree of depth is 26 μm.The dullness being connected unevenness under the results are shown in all situations of the cutting part degree of depth with intensification is improved.Cutting part for hard supporting layer and sublayer the most effective.
Table 5: in contrast to the cutting part degree of depth and sublayer hardness to the prediction being connected unevenness; Between initial point, embossment is 250 μm, and initial fine-feature depression is 150 μm
reference numerals list
The most top horizontal plane of 6 fine-feature
Embossment horizontal plane between 8 minimum points
9 critically print horizontal plane
10 base surface area extensions
The stress sensitive border of 11 floor interface
12 non-ly print plateau
The stress sensitive border at 13 approximation space interfaces
The stress sensitive border of 14 floor interface add high relief
The stress sensitive border at 15 approximation space interfaces add high relief
The width adding high relief on the stress sensitive border of 16 floor interface
The width on the stress sensitive border at 17 approximation space interfaces
The embossment horizontal plane on the stress sensitive border of 18 floor interface
19 to next near can the half of total distance of print characteristics
20 bottom surface embossment horizontal planes
The 24 non-angled walls printing plateau
The embossment horizontal plane on the stress sensitive border at 26 approximation space interfaces
Space between 27
The most end face of 30 original flexible board parts
The coarse high light feature of 40 outside sites
41 coarse high light features
42 coarse high light features
The coarse high light feature of 43 inner sites
The dot size of 48 coarse high light features
50 rough features
51 next immediate neighbouring rough features
60 flexographic features
The outside site of more than 70 fine-feature
71 fine-feature sites
More than 75 fine-feature site
The site, inside of 77 fine-feature
80 supporting layers
90 band basic units
100 laser emissions
110 drums
130 motors
140 electrical leads
150 driving screws
155 driving screw motors
160 computers
170 laser thermal print heads
175 lens
180 remains gathering systems
190 print head platforms
Claims (8)
1. prepare a method for flexographic features, comprising:
Digital picture is provided;
Calculate the camegraph based on digital picture;
Identify at least one the stress sensitive borderline region adjacent at least one characteristics of image;
Flexographic features produces camegraph; And
Deepen the degree of depth adjacent to the base surface area at least partially of at least one characteristics of image, to provide the base surface area of correction.
2. the method for claim 1, the minimum widith of the base surface area wherein revised is at least 5 μm.
3. the method for claim 1, the Breadth Maximum of the base surface area of wherein said correction is less than the half from stress sensitive border to the distance of next nearest characteristics of image.
4. the method for claim 1, the minimum-depth wherein deepened in base surface area is at least 10 μm.
5. the method for claim 1, the depth capacity of wherein deepening in base surface area is less than the degree of depth of the basalis of flexographic features.
6. the method for claim 1, the degree of depth of wherein said a part of base surface area is deepened by laser engraving.
7. the method for claim 1, wherein digital picture is stored on memory storage.
8. the method for claim 1, wherein calculates camegraph on computers.
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13/031,300 US8709327B2 (en) | 2011-02-21 | 2011-02-21 | Floor relief for dot improvement |
| US13/031,308 US20120210893A1 (en) | 2011-02-21 | 2011-02-21 | Floor relief for dot improvement |
| US13/031,300 | 2011-02-21 | ||
| US13/031,301 | 2011-02-21 | ||
| US13/031,301 US8520041B2 (en) | 2011-02-21 | 2011-02-21 | Floor relief for dot improvement |
| US13/031,308 | 2011-02-21 | ||
| PCT/US2012/025771 WO2012115888A1 (en) | 2011-02-21 | 2012-02-20 | Floor relief for dot improvement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103391846A CN103391846A (en) | 2013-11-13 |
| CN103391846B true CN103391846B (en) | 2015-11-25 |
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| CN201280009484.5A Expired - Fee Related CN103391846B (en) | 2011-02-21 | 2012-02-20 | Prepare the method for flexographic features |
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| Country | Link |
|---|---|
| EP (1) | EP2678159B1 (en) |
| CN (1) | CN103391846B (en) |
| WO (1) | WO2012115888A1 (en) |
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| CN104309272B (en) * | 2014-10-15 | 2016-08-24 | 广东壮丽彩印股份有限公司 | The manufacture method of plastic relief security pattern mother matrix |
| CN114193905B (en) * | 2021-12-16 | 2023-05-02 | 广东上运激光科技有限公司 | Novel engraving process for plate roller |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN103391846A (en) | 2013-11-13 |
| EP2678159B1 (en) | 2014-11-26 |
| EP2678159A1 (en) | 2014-01-01 |
| WO2012115888A1 (en) | 2012-08-30 |
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