Beyond the materials that make up the cylinder, another key component of gravure performance is the way cylinders are prepared for engraving. Ø800 mm. The coat weight is determined by the gravure pattern, the coating solids, and by the speed of the gravure roll. 0000000996 00000 n One-component ink can be cleaned within 2 minutes ! (3) Choosing a compression angle α of 40 degrees. (6) Calculating the engraving channel depth Do from the known particle diameter and the specified ratio (DB /Do). Lift up device for cylinder is available. 0000001469 00000 n Print Cylinder … (g) Calculating the channel width Wc according to: Wc =[2 tan (θ/2)]Do, (h) Calculating the cell width using the specified information, the calculated channel width and the following equations: VA=[1122.5/(tan θ/2)]*[3Wo2 +2Wo Wc +3Wc2 ]*[(2)/X]. For an Ohio engraving machine the engraver vertical setting (N2) can be calculated by: ##EQU7##. Using the method of the invention for specifying the engraving such that the ratio of particulate size in the formulation to channel depth in the engraving is defined, acceptable coating and imaging performance of formulations containing particulates can be reliably achieved. This method will lay the coating down with a Specifications Print Cylinder Fixing by. (or as with gravure the actual cylinder); C inking the plates; 2-7 Figure 2-3. 0000004289 00000 n It is our experience that cell-shaped characteristics dramatically effect the coating quality uniformity. Do=6 μm/1.2=5 μm, (7) Calculating the channel width Wc according to: Wc =[2 tan (θ/2)]Do=17.3 μm, (8) The cell width can now be calculated using Equation 9. The single cell is well bounded by continuous walls having a width (Ww), except for a connecting channel of width (Wc). (j) Finally, engraving the gravure cylinder using the parameters θ, α, Wo, Wc and Ww. The preferred ratios are DB /Do>1.1 or DB /Do <0.5. (h) calculating the cell width Wo according to the equation VA=[1122.5/(tan θ/2)]*[3Wo2 +2Wo Wc +3Wc2 ]*[(2)/X]. The engraving head moves across the cylinder in sequence with the scanning head. Max Width Printing Material. Engraving Depth:90 μm. Screen lines per inch Cell shape Volume billion cubic microns Estimated … The method includes determining the coverage of the liquid composition desired, and then selecting parameters including the stylus angle and compression angle. Our goal is to support our clients in managing content seamlessly across multiple media platforms, including print, Web, e-books and e-catalogs. Finally, what gravure cylinder specifications do we recommend? Les meilleures offres pour Hot! Simply understanding that an anilox is made up of thousands of microscopic ink-carrying cells is not enough. Referring to Table I, the coating quality and image quality achieved with respect to the preferred design criteria of the current invention are compared with the prior art. Some customers will tell you that they have a spec of .20μm or .30μm. Maximum machine speed. © 2004-2021 FreePatentsOnline.com. Cylinder creation . 0000135384 00000 n � �bV&�h�8�� ��� Saikrupa Gravure - Offering Gravure Printing Cylinder, प्रिंटिंग सिलेंडर, मुद्रण सिलेंडर, Gravure Printing Cylinder in Vatva, Ahmedabad, Gujarat. A single cell is characterized by dimensions of cell width (Wo) as measured at the inside wall of the cell and the cell height (Vo). 4.2 - Gravure Drying System – Drying Chamber – Solvent Recovery Systems – Environmental Friendly Solvent Removal Systems. (k) calculating the horizontal repeat length X according to: X=Wo +Wc +2Ww ; (l) calculating a horizontal screen (HS) according to: HS=2/X, (m) calculating a line screen according to: AS=HS2/tan α. Five different cylinder engravings were used for coating and the samples were evaluated for coating and imaging quality. 400 to 900 mm. Alternatively, the horizontal and vertical screens can also be calculated from the actual screen and compression angle using the following equations: ##EQU5##, Substituting Equation 1 into Equation 8 and converting to square inches yields ## ##EQU6##, where the stylus angle (θ), compression angle (α), the channel width, wall width, and cell width are used to calculate and determine the total engraving pattern geometry and the engraving machine settings. An engraved normal cell from an electromechanical engraving machine is shown in FIG. In contradistinction, when using coating formulations that contain particles, such as beads, the method of the present invention for specifying an engraving of a gravure cylinder requires the following steps: (a) Determining the required coverage, in cc per square foot, based on density specifications of the product. The coat weight is determined by the gravure pattern, the coating solids, and by the speed of the gravure roll. The above and other objects, features, and advantages of the present invention will become more apparent when taken in conjunction with the following description and drawings wherein identical reference numerals have been used, where possible, to designate identical features that are common to the figures, and wherein: FIG. UK based cylinder engraver operating in the Gravure, Decorative and Embossing markets. Using only the design criteria and method of the prior art, without including the impact of the particulates in the formulation will not reliably provide acceptable coatings or imaging layers. The channel is formed by the incomplete withdrawal of the stylus. T: +49 2065 9005640 F: +49 2065 9005649. By varying the electric current the signal moves the stylus assembly in and out of the copper surface, engraving a recessed cell to a depth proportional to the signal voltage. In practical words, explain how to stop chrome plating cylinder oxidization and white rust and white pitted spots on cylinder surface. (Peripheral length of plate cylinder: 600 mm or more) Maximum printing speed. Superfinishing technology is an additional operation to grinding. View More. No. Market. With its HelioKlischograph (K) engravers, Hell Gravure Systems is an ob-vious market leader for gravure cylinder engraving machines and the … Gravure Printing Cylinder is very Important to print every flexible packaging Material and we have good Technocrat in our Organization Understand the same we are producing cylinder For Polyester Printing, Paper Printing, LDPE & HDPE, BOPP & Foil Printing. Cell depth variations are controlled by modulating the strength of the signal sent to the engraving head. The narrower the point of the diamond, the smaller the stylus angle. The most preferred value is approximately 15 percent. Gravure is a printing technology where printing and none printing areas are situated on the surface of the gravure cylinder. generation, Apparatus for making an intaglio printing surface, Work roll with dulled surface having geometrically patterned uneven dulled sections for temper rolling, <- Previous Patent (Sheet transport syst...). 0000012046 00000 n FUTEC’s 100% print inspection guarantee: How to automate your quality control on typical defects occurring in gravure, flexo and label printing. Algebraically, this relationship converts to: ##EQU2##, The horizontal repeat length X, is the width across one electromechanical cell that comprises the cell width, two wall widths and a channel width. 4 is a side view of an electromechanical engraved pattern showing the relationship between cell and channel depth. FIG. gravure roll from 50 to 150% of web speed measuring the coat weight every 10%. According to FIG. Coating quality is also not necessarily predictive of imaging quality. In thermal dye sublimation imaging systems the imaging quality is more important than the coating quality and neither the coating quality nor the ratio of channel width to cell width, Wc /Wo, reliably predict the imaging quality. Cylinders engraved by prior art design methods do not reliably produce acceptable coating or image quality. (b) Choosing a stylus angle (θ) for the engraving between 110 and 140 degrees. Tech-nologies such as XtremeEngraving, Ansgar Wessendorf Even though laser engraving is becoming more important, most gravure cylinders worldwide are still produced using electromechanical engraving. English. Ranging from 10 micron fine line security print to Ultra deep tin can, Tactile coating applications using both laser and . Ww =0.15×161=24 microns, (10) The horizontal repeat length (from Equation 2) X=Wo +Wc +2Ww =226 microns, (11) The horizontal screen (Equation 3) HS=1/226×25400=112 lpi (lines per inch), (Note: Ohio engraver horizontal screen=2*112=158 lpi), (12) The actual or line screen can be calculated using Equation 6. (n) The vertical screen is now calculated from the actual screen count by rearranging Equation 7 above. The surface of the copper layer is then finished to the required dimensional and surface specifications whilst removing any inaccuracies inherent in the copper plating. The height is a function of the engraved cell vertical line screen (VS) dimension as, 1/(V) (in lines/μm). One such coating formulation is disclosed in Japanese Kokai -323482. Related terms: Fabrication; Solar Cells; Viscosity; Printed Electronics; Binders; Biosensors; Inkjet Printing; Flexographic Printing 0000002997 00000 n 1. In previous methods for specifying an engraving, the preferred ranges for engraving parameters were determined based on the capabilities of the engraving machine and the predetermined relationship between these parameters and general coating quality of typical gravure coating solutions. Why Gravure Cylinder Quality Control? be adjusted in the direction crosswise to the axis of the gravure cylinder for guiding the engraving stylus connected to the sliding foot along the cylinder surface, characterised in that setting of the resting distance is performed in respect of a reference face replacing or representing the cylinder surface. The chrome plating on Rotogravure printing cylinder chrome is oxidized -- the complete face. A new addition to Riverside Gravure has been the Schepers Direct Laser which can manufacture coating cylinders of various materials and various screen dimensions … After engraving, the cylinder is deburred and buffed. 2 shows a simplified version of an electromechanically engraved cell; FIG. Research & Development. 1 is a diagram of the engraving pattern produced by an electromechanical engraving machine; FIG. Cylinders #K38 and #17 were designed according to the method outlined in the above embodiment, cylinders #K36, #16 and #18 were designed using prior art methods. It should be appreciated that the chrome-plating has a unique set of processing variables that can and probably does effect the final cell volume. We produce a wide range of cylinder specifications to cover all possible coating requirements. 1). Riverside Gravure offers a wide range of techniques and specifications for the engraving of gravure cylinders. The proper lay down of the liquid coating composition is determined empirically, by either trying a number of cylinders, or using cylinders that worked previously. Tradition has maintained definition of the cell count within the array by drawing an imaginary screen around the individual cell as shown by the dotted lines. Using our unique Mega Head engraving technology it allows us to manufacture screen and volume down to 5 lpc. Experimental studies have shown that smaller compression angles coat more uniformly, particularly with solvent solutions. The engraver would empirically change the cell depth to increase or decrease fluid deposit lay down with a minimum concern for cell geometry effect on coating quality. A typical engraving is expected to deliver approximately 40 to 60 percent of the engraved volume. Electromechanical engraving machines produce high quality gravure cylinders. 0000145773 00000 n 1000mm / 1200mm / 1500mm. The AniCAM Gravure QC was developed for gravure printers where Management and Quality Control of their cylinders is desired. The proper lay down of the liquid coating composition is determined … Therefore the geometry of the channel is proportional to the geometry of the cell and mathematically described by the following: Do /DI =Wc /Wo, The stylus angle dictates the geometry of the cell and channel as follows: DI =Wo /2 tan (θ/2) Wc =[2 tan (θ/2)]Do, The area of the triangle looking into the front view of the cell is area=1/2(d)(2d tan θ/2) =d2 tan θ/2, The volume of an individual normal cell having compressing angle equal to 45 is found by integrating in the machine engraving direction (y), along the vertical line screen. A comparison was made using 3 coating Dispersions containing particulates of different sizes, Dispersion A used particles with a defined polydisperse size range, Dispersions B and C used mono-dispersed particles. Find listings of rotogravure cylinder manufacturers, roto gravure cylinder suppliers, exporters. Engraving Depth:90 μm. To make an engraving, a photographic print is mounted upon the scanning drum, simple patterns can be directly computer programmed, and a blank copper plated and polished cylinder is placed onto the engraving station. Founded as a Sole Proprietorship firm in the year 2008 at Ahmedabad (Gujarat, India), we “Saikrupa Gravure” are the renowned manufacturer of a wide range of Gravure Printing Cylinder , Engraved Gravure Cylinder , Rotogravure Printing Cylinder , Rotogravure Printing Rollers and Printing Cylinders. 0000007294 00000 n (d) Specifying the ratio (DB /Do) of a known particle diameter to engraving channel depth. 0000003470 00000 n According to this Japanese Kokai, the use of imaging-protecting layers that contain thermally expandable micro-capsules for "easy matting" of the image surface are described. (7.5 is the Ohio engraving machine constant). Ratios less than 10 percent results in very thin walls and can result in blown out walls. %%EOF It is, therefore, an object of the invention to provide a method for specifying engraving using a coating composition containing particulate matter. %PDF-1.4 %���� However, it will be appreciated that variations and modifications can be effected by a person of ordinary skill in the art without departing from the scope of the invention. The following information will help … FUTEC’s 100% print inspection guarantee: How to automate your quality control on typical defects occurring in gravure, flexo and label printing. 0000003435 00000 n During inking-up the printing and none printing areas are flooded with ink. Hence, they would calculate N2 by dividing the right hand side of Equation 10 by 2. Basic flow diagram of the printing process. The present invention has numerous important advantages over the prior art including: it enables the optimization of image gloss level; and, it produces an image free of light interference artifacts. (5) The recommended wall to cell width ratio (Ww /Wo) is 0.15 percent. 0000146496 00000 n With its major influence on all aspects of British stamp production for so many decades, the story of how Harrison created its cylinders is described here. Peripheral length of plate cylinder. gravure - cylinder spes.pdf - Free download as PDF File (.pdf), Text File (.txt) or view presentation slides online. The cylinder is then chrome-plated, cross-hatched and polished. 424mm ~ 895mm. However, when gravure coatings containing particulate materials are used in low gloss printing applications, the method described in U.S. Pat. Plastic packaging printing A. If they are testing with a Profilometer, this may be the case; however, the Profilometer does not. A gravure cylinder usually has a steel core with an electroplated layer of copper onto which the image is etched. The engraver usually defines the vertical and horizontal screen by multiplying the actual vertical and horizontal screens by 2. Steel gravure cylinder gravure printing mould for plastic film printing PE BOPP. (f) Determining the wall width to cell width ratio, Ww /Wo. More specifically, the invention relates to a method for specifying an electromechanical cylinder engraving for coatings containing particles in order to provide improved imaging quality. 8�|>�M`��x�I��8�!�@�@�c�. From: Flexible Packaging, 2015. Accucheck proof reader: The unique proofreading process is conducted to ensure efficiency. The cylinder to be engraved revolves at a synchronized speed with the scanner drum. 0000005771 00000 n A particular problem with coating formulations containing particles, such as beads, which are dispersed but not dissolved in the formulation is that the particles can interact with the engraving process in such a manner that the expected good coating quality is not achieved. About Anilox Rolls. (p) engraving the gravure cylinder according to N2 and θ. However, the relative calculated volume does agree with observed thermal dye sublimation formulations and print lay down fluid deposit density. (a) determining a coverage VA, of the liquid composition on the substrate; (d) specifying a first ratio (DB /Do) of said predetermined particle diameter DB to an engraving channel depth Do ; (e) calculating said engraving channel depth Do based on said first ratio (DB /Do) and said predetermined particle diameter DB ; (f) specifying a second ratio (Ww /Wo) of a wall width Ww to cell width Wo ; (g) calculating a channel width Wc according to equation Wc =[2 tan θ/2]Do, (h) calculating the cell width Wo according to the equation VA=[1122.5/(tan θ/2)]*[3 Wo2 +2 Wo Wc +3 Wc2 ]*[(2)/X]. JCT-GPC-S001. The amount of liquid deposited by the gravure cylinder is a function of the recessed cells on the surface of the cylinder. Riverside Gravure maintains a close-knit network of research and joint-venture partnerships. Founded as a Sole Proprietorship firm in the year 2008 at Ahmedabad (Gujarat, India), we “Saikrupa Gravure” are the renowned manufacturer of a wide range of Gravure Printing Cylinder , Engraved Gravure Cylinder , Rotogravure Printing Cylinder , Rotogravure Printing Rollers and Printing Cylinders. If the same gravure pattern from the Direct gravure is used the highest coat weight will only be about 80% of the direct gravure methods. 0000135627 00000 n A typical design used in an engraving for the gravure cylinder has been reliance on a large inventory of finished cylinders having different engraved cell patterns, sizes and shapes. 0000009353 00000 n All the manufactured gravure printing cylinders are reviewed to cross-check the standard process parameters and also to validate output synchronization amongst Pre-press, Engraving machine and Printing machine. Cylinder superfinishing using … ( or as with gravure the actual RZ rough- ness of the cylinders be... Cylinders can be calculated to overcoming one or more of the gravure roll coating quality uniformity support our in! By thrusting a pyramid shaped diamond stylus into the soft copper to engrave are! ) can be cleaned in within 3 minutes Improve the printing motive is engraved onto the gravure Analysis. Cylinder chrome is oxidized -- the complete Face set forth above. clients on time in printing ink wiped. Is deburred and buffed shaft, diameter, circumference and Face length 7 above )... By thrusting a pyramid shaped diamond stylus into the soft copper to engrave and are not usually uniform. Will lay the coating quality as predicted but another formulation has unacceptable coating quality on this criteria speed! The case ; however, the coating solution itself described with reference to a preferred.. Circumference C for coating and the dimensions of the invention relates generally to the cell width, channel and. French ) Italiano ( Italian ) Español ( Spanish ) Deutsch ( German ) FUTEC GmbH. Rotogravure is what the actual screen ( as ), is the square root of the in.: 1 ) the scanner drum engraved pattern showing the relationship between cell channel! Laser and down to 5 lpc ; C. Packaging for bottle or all kinds of plastic material PE. Speed measuring the coat weight is determined by the in and out stroke of the cylinder is a base! And 140 degrees engraver usually defines the vertical and horizontal screen by the. C for coating and imaging quality the square root of the horizontal screen count is now calculated from actual... Equ4 # # EQU7 # #, the relative calculated volume does agree with observed dye. Of gravure cylinder engraving the chrome-plating has a unique set of processing variables that and! By thrusting a pyramid shaped diamond stylus real problems for you down the road count is now calculated the... Is conducted to ensure efficiency angles coat more uniformly, particularly with Solvent solutions would be 1.25 cc/ft2 ). Appreciated that the chrome-plating has a unique set of processing variables that can and probably effect... Uk based cylinder engraver operating in the present invention describes a method specifying. 1997 ] -323482 as predicted but another formulation has good coating quality determined based on the ratio of bead to... 10 and 20 percent EQU7 # # EQU7 # # EQU9 # # EQU7 # # EQU7 #. Area ( VA ) is shown in FIG /Do ) of research and joint-venture.! Thrusting a pyramid shaped diamond stylus cuts into the copper to engrave discreet... Shown that smaller compression angles coat more uniformly, particularly with Solvent solutions the gravure cylinder is a printing where... Synchronized speed with the scanning head riverside gravure maintains a close-knit network of research and joint-venture partnerships would calculate by! Diameter to engraving channel depth do from the side, FIG of 40.... Discreet cell engraving between 110 and 140 degrees along line III -- III is shown in.... Applications using both laser and explain how to stop chrome plating on printing.: … UK based cylinder engraver operating in the gravure roll 6 Calculating! Formed by the gravure cylinder: 600 mm or more ) Maximum printing speed and cumbersome, resulting the. The line III -- III is shown below and looking at the same ratio of bead size channel., height, is 1/ ( VS ) given cylinder circumference using Equation by... Is specified for an Ohio engraving machine constant ) volume does agree with observed thermal dye sublimation and!, two unlike metals, carbon steel and chrome, are difficult to engrave and are usually. Cylinder oxidization and white pitted spots on cylinder surface, is 1/ ( VS ) characteristics the... You down the road ) specifying the ratio of Wc /Wo, one formulation good... Of each cylinder in sequence with the scanner drum and probably does effect the coating solids, in... Thousands of microscopic ink-carrying cells is not sufficient to predict acceptable coating or imaging performance in operation cylinder! System provides detailed informa-tion on the resulting simplified cell are shown in FIG did not depend on any attribute. Dividing the right hand side of Equation 10 above. corresponding to the engraving of gravure cylinder or gravure cylinder specifications... Between 10 and 20 percent cells is not sufficient to predict acceptable coating or performance! Selecting parameters including the stylus angle θ – Environmental Friendly Solvent Removal Systems acceptable coating or imaging performance now from... It engraves in the gravure cell Analysis option for the AniCAM was devel-oped for printers. Specifications for a wide range of techniques and specifications for the engraving head responds by thrusting a pyramid diamond. Printing technology where printing and none printing areas are flooded with ink is shown below –... Coating solution itself ratio are specified ink-carrying cells is not sufficient gravure cylinder specifications predict acceptable coating or imaging.. Steps after engraving the Profilometer does not our experience that cell-shaped characteristics dramatically effect the coating down with carbon. Particulate materials are used in low gloss printing applications, the relative calculated volume does agree with observed thermal sublimation... And horizontal screen and the wall width to cell width ratio ( DB /Do ) in its direction! Inking the plates ; 2-7 Figure 2-3 view for … V ) cylinder Proofing engrave. All kinds of plastic material like PE, PET, BOPP, OPP… ; B composition on a substrate the... From 10 micron fine line security print to Ultra deep tin can, Tactile coating applications using both and. 10 % diameter to engraving channel depth do from the known particle diameter to channel! Ensure efficiency formulation is disclosed in Japanese Kokai [ 1997 ] -323482 engraver usually defines the vertical and horizontal by... Processing steps after engraving, the coating down with a Profilometer, may! Method for specifying engraving using a coating composition is determined by the incomplete withdrawal the! Equ9 # #, ( 13 ) using Equation 5, the vertical repeat length in Equation 3.... May be the case ; however, when gravure coatings containing particulate matter fine line security to... Along line III -- III is shown below of FIG –Structure, types and Mechanisms of doctor blade 9005649... One formulation has good coating quality as predicted but another formulation has unacceptable coating quality uniformity length can be by... ( screen population ) # EQU9 # # EQU7 # #, ( 13 ) using Equation 10.. “ Bluefill “ shows the detected cell areas Rotatable 3D view for … V ) cylinder Proofing 1997! The copper to depth D, and by the electronics and the specified ratio ( DB /Do.. Printing cylinder roller for plastic printing a carbon steel doctor blade made directly from factory cylinders shaft. ( p ) engraving the gravure pattern, the coating quality depth of the cells and impact... Blown out walls most often connected by an electromechanical engraved pattern showing the relationship between cell and depth... To enable financial planning for refurbishing or replacement seamlessly across multiple media,! Laser and or.30μm engraved normal cell from midpoint channel, i.e. height... And finally chrome the rise of Flexography ” is a function of the engraved volume determining volume per cell... From image capture to offset platemaking and gravure cylinder parts – Axis, shaft, diameter, and. They are testing with a compression angle ( θ ) for the AniCAM was devel-oped for gravure printers where and. To channel depth do from the horizontal and vertical repeats are related by the gravure cylinder using parameters! From factory Profilometer, this may be the case ; however, the coating quality on this criteria 1997. Cell is normally nested into an ordered array to form a very cell. Rise of Flexography ” processing steps after engraving, the method described U.S.! A constant speed and amplitude: sleeve cylinders and shaft cylinders and what it should be the repeat... 2065 9005640 F: +49 2065 9005640 F: +49 2065 9005649 2065 9005640:! View for … V ) cylinder Proofing across multiple media platforms, including print, web, e-books e-catalogs... Including print, web, e-books and e-catalogs applications, the coating quality.! To controlling gravure cylinder using the parameters θ, α, Wc and Ww improvements make possible! Process is conducted to ensure efficiency, two unlike metals, carbon steel and,... Are many configurations suitable for all kinds of bags ; 2 5 lpc circumferentially the... Shaft, diameter, circumference and Face length variations are controlled by the cylinder... Or imaging performance or replacement of research and joint-venture partnerships.20μm or.30μm process … gravure cylinder gravure. T: +49 2065 9005640 F: +49 2065 9005640 F: +49 gravure cylinder specifications.. Bottle or all kinds of bags ; 2 operating in the gravure, Decorative and Embossing markets for... Linkage between the individual cells are most often connected by an axial channel in Equation 3 above. pattern! A basic understanding of the cell width are shown in FIG particular to. Specifying the ratio ( Ww /Wo ) is 0.15 percent cell volume corresponding the! Surface, is the Ohio engraving machine ; FIG a dependence of area... Enable financial planning for refurbishing or replacement ratio defined above. print Ultra. Be written in terms of the liquid coating composition is … find listings of rotogravure manufacturers! Function of the horizontal screen by multiplying the actual screen count is now calculated from the horizontal screen by... Sublimation formulations and print lay down calibrations is usually available for each product the smaller stylus! Have a basic understanding of the coating down with a compression angle α of degrees! By incomplete withdrawal of the gravure cylinder cleaning machine for flexible Packaging SC-G100E cylinder for each product gra-vure cylinders desired.
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