gravure ink viscosity

Real time, in-line viscosity monitoring and control in printing process is essential to improve performance and reduce costs in any printing process – flexographic, gravure or corrugated. Gravure inks are fluid inks with a very low viscosity that allows them to be drawn into the engraved cells in the cylinder then transferred onto the substrate. This would mean viscosity could be controlled without worrying about temperature! The piston automatically cycles and cleans the sensor ink measuring chamber without operator involvement. This can be managed a couple of ways: managing absolute temperature throughout the press equipment, process fluids and pressroom; or incorporate temperature-compensation into the viscosity measurement. Reduce viscosity 2. If you are above the line, excess ink or coating material is being applied and money wasted; if below, inadequate coat weights result. When the operator was not able to pay as much attention, significantly more material was applied. Small changes in the composition or impure raw materials result in different chemical and physical properties of the ink that might negatively affect the printing process. Cambridge Viscosity, Inc. is located at the intersection of Rte 93 in Boston, MA, Cambridge Viscosity, Inc.50 Redfield St, Suite 204Boston, MA 02122 USA781 393-6500, Temperature-Controlled Viscometer: VISCOlab 3000, Online Viscosity Monitoring: VISCOpro 2100, Online Viscosity Controller: VISCOpro 2000, In-Line Viscometer: 392 Round Flanged Sensor, In-Line Viscometer: 393 Round Flanged Sensor. INK APPLICATIONS • Priming piston pumps have flow rates up to 7.5 gpm (28.3 lpm) and are perfect for high viscosity finished ink or ingredient supply • Husky … Gravure printing Coating volume Approx 4g/ (wet) Number of plates 175lpi 250lpi Ink type Solvent or Water based Plate material Iron (alturminum) core + plating Exhaust VOC Combustion Viscosity 15 – 17 seconds (No.3 cup) Knowing the density and viscosity of ink is of great importance for ink producers because these physical properties provide important information on the quality and utilizability of the raw material and the final product. (See cutaway drawing of ViscoPro sensor at left.) The low viscosity and quick dry time needed for gravure inks can be affected by something as simple as a temperature change from morning to afternoon. While some may not view this as the most dire of issues, it still affects your quality and can lead to waste and possibly rejections. With today’s electronics and software, temperature compensation is easily accomplished. Flexible solvent lines are also inserted into the tank and add solvent when directed by the automatic controller. In this rotogravure application the converter’s Bobst Lemantic press utilizes removable ink carts. Under the normal environmental humidity, the ink printing viscosity is above 16S (Zahn No. This extra margin translated directly into excess coating being applied and needless money being wasted. Generates tight viscosity control to maintain professional process quality gravure offset printing does not have any effect on the amount of transferred ink, because the set process transfers all the ‘offed’ ink from the blanket to the substrate. Gravure – Multi Station System Optimizing your ink viscosity has never been easier! Customized solutions that maintain ink viscosity in print industries, including corrugated, gravure, and flexographic printing. The viscosity of a stationary ink can differ from that of a moving ink by as much as 20%! viscosity (the ink’s resistance to flow), solvent evaporation rate (how quickly solvent evaporates from within the ink), and drying. As a gravure printer, your clients expect you to deliver high-quality finished products with sharp, fine images. Known for innovation in viscosity measurement and control, Cambridge Viscosity specializes in the industry's most accurate, reliable, and easy-to-use viscometers for research laboratories and process environments. Unfortunately, it is not. Cambridge viscometers, for instance, incorporate a temperature detector in the heart of the sensor so both temperature and viscosity are recorded for each and every measurement. Representative results show viscosity control is important to color consistency. Press rooms are now looking to shrink make-ready time and gain productivity … When the job is completed the converter simply takes out the sensor and drops it into a bucket of solvent. 856 gravure ink viscosity products are offered for sale by suppliers on Alibaba.com A wide variety of gravure ink viscosity options are available to you, There are 58 suppliers who sells gravure ink viscosity on Alibaba.com, mainly 7. Features Excellent printability. When the operator was not able to pay as much attention, significantly more material was applied. If you aren’t able to maintain the proper viscosity of your ink, it may not dry before reaching the next station on your … Check oven and fountain. Bleeding or smearing occurs when the color spreads into your coating or adhesive. Add clear varnish 3. Therefore, if good gloss is required, then it is advisable to adopt to gravure printing ink with high viscosity (13-19S. Cambridge Viscosity, Inc. is located at the intersection of Rte 93 in Boston, MA, Cambridge Viscosity, Inc.50 Redfield St, Suite 204Boston, MA 02122 USA781 393-6500, Temperature-Controlled Viscometer: VISCOlab 3000, Online Viscosity Monitoring: VISCOpro 2100, Online Viscosity Controller: VISCOpro 2000, In-Line Viscometer: 392 Round Flanged Sensor, In-Line Viscometer: 393 Round Flanged Sensor. Gravure Ink Viscosity Viscosity Control Features That Converters are Now Demanding (Page 2) When controlling manually, the press operator gave himself a margin for error, as shown by consistently running the viscosity higher than necessary. Improve Ink Mileage Improve the startup procedure to reduce waste, use a less absorbent paper, get the prescribed viscosity by adjusting the ink –solvent ratio, reformulating the ink if the ink is penetrating the stock too fast, and It would be great if the line of constant solids concentration were horizontal in this picture. (See photos at right). In order to dry the ink and drive off the solvents or water, which essentially replaces most of the solvent, the paper is run through Gas fired or electric fired driers. All press equipment, including viscosity control systems, need to be much more reliable, require significantly less maintenance, enable shorter make-ready times, and be able to operate in a world where pressman skills are decreasing. 3 cup). Mutual solvability with alpha ink (toluene type): It can be mixed with alpha ink but in that case use diluents Color Consistency: Color consistency and viscosity are also related. The color lab might be at 75°F, for instance. GRAVURE TROUBLESHOOTING www.VISCOSITY.COm saint clair systems norcross Cell Plugging (Also Drying in) Problem: Weak, non-uniformed dots, ink and coating residue does not re-wet CAUSE 1. And in addition, ink viscosity is strongly temperature dependent. Exhibit 3: Viscosity, Temperature and Solids Concentration. The rugged in tank sensor is simply lowered into the ink tank and automatic sensing of the tank's ink viscosity begins. The use of decentralized control and an VP1500 in-tank system proved to be the easiest for the converter to make-ready and operate. Gravure (Rotogravure) inks are solvent-based ink with low viscosity, which can be quickly dried by vaporization. Ink Viscosity Controller Weight drop viscosity measurement controller optimizes ink conditions. Gravure-ink viscosity-dot gain-density-print quality-mottling This purpose of this paper is to examine the impact of ink viscosity on gravure optical print quality. Parameters of the gravure process also Further, the In gravure printing, the pattern is made up of recessed cells below the Neither shear thinning nor thixotropy is required for gravure coating but This converter saved $80,000 in coating costs per year plus improved his quality and consistency by changing to Cambridge’s automatic viscosity control. At these raised temperatures, the viscosity to keep the correct solids concentration drops to 37 or 32 cup seconds. Each sensor had its own control at the individual unit where the operators make all the individual units color deck adjustments. All press equipment, including viscosity control systems, need to be much more reliable, require significantly less maintenance, enable shorter make-ready times, and be able to operate in a world where pressman skills are decreasing. Adjusting for the effects of temperature on viscosity is easily accomplished. RaQ Adopting the way weight-drop method is more reliable by direct ink contact. Weak Print 1. In fact, the company has additional patents applied for this critical function of self-cleaning. The factors affecting the viscosity are closely related to the temperature, the concentration of the component particles, the particle size, etc., and have little to do with humidity and pressure. Simple VISCOpro Touch Screen Operator Interface - Screen 1. High viscosity ink 1. On printing presses on which the temperature of the inks is not conditioned If the viscosity set-point is not temperature-corrected, you are giving away money! When a job is completed the converter removes all hoses, ink tanks and the cart with cylinders and sends them to an off press clean up room. PVB resins for Flexo & Gravure Printing Inks Drovin™ B-20 Drovin™ B-20 is a low viscosity grade of polyvinyl butyral resin. Ink viscosity drops under high shear (shear thinning) and stays low for a while after being sheared (thixotropy). Each in-tank viscometer utilizes a simple, inherently low maintenance sensor which is now available. With more than 50 years of experience in our luggage, our engineers set out on a journey to set new standards in the field of viscosity technology. Spare carts, hoses and ink tanks are used to make ready the subsequent job. In the pressroom the press might also be at 75°F at start-up as well, or 50 seconds is fine. Cambridge’s electronics integrates these to calculate temperature-compensated viscosity so that it can tell whether the concentration measured is on target or not, and then take appropriate action. If you aren’t able to maintain the proper viscosity of your ink, it may not dry before reaching the next station on your Short body ink 2. The main drawback is the difficulty in creating inks where the right combination of surface energies, ink surface tension and ink viscosity gives good patterning. 4. Gravure is quite tolerant to these behaviors. After 10 minutes of operation, however, the press might heat-up to 80°F, and after ½ hour might be 85 or 90°F. Gravure Ink Viscosity Controlled! Cells plugged with paper, A simple touch-screen interface option allows operators to quickly set up the sensors and allows for a quick at glance status of all units. Printing viscosity: 14~18sec(Zahn Cup No.3, 25 )is recommended; however, adjust according to printing conditions (Plate, printing speed). Two screens accessible at the touch of a finger give operators complete control. Known for innovation in viscosity measurement and control, Cambridge Viscosity specializes in the industry's most accurate, reliable, and easy-to-use viscometers for research laboratories and process environments. The advantages of gravure printing lie in the high, consistent, and continuously reproducible print result. It has a marked impact on the relation between viscosity and the solids concentration in the ink or coating, as shown in Exhitbit 3. Fasnacht presents the ORIGINAL! Color consistency is influenced by a number of factors including color density, anilox volume, ink transfer, web substrate characteristics, doctor blade use and characteristics, as well as ink viscosity. Ink drying fast 4. Temperature: Temperature is also a key factor. Based on that, they might tell the pressman to maintain a viscosity of 50 cup seconds on a #3 Zahn cup to maintain the targeted coat weight or color concentration. When controlling manually, the press operator gave himself a margin for error, as shown by consistently running the viscosity higher than necessary. Cambridge’s multi-deck touch-screen display is shown below. It has the characteristic curve-shape shown. Aqueous Rotogravure Ink TG-PAC Ink This aqueous gravure ink for films resolves issues concerning occupational environment hygiene, and air pollution. Our unique INKSPEC operating system provides unsurpassed control of the inking process to deliver high precision printing and color consistency. On the other hand, the off process is usually unable to pick up Gravure Ink Viscosity Viscosity Control Features That Converters are Now Demanding Shorter production runs, OEM press automation, and competitive pressures are daily challenges for gravure. The strong correlation between temperature and ink viscosity suggest that fluctuations in temperature can have drastic impact on the ink viscosity. One button set of viscosity, manual solvent add and cup/sensor calibration makes this control simple and pressroom practical. Adjust ink drying by adding slow solvent 5. Up to twelve units can be displayed on one 7” touch-screen. 3 cup), and the static phenomenon generally does not occur. Excels in transferability and plate Cutaway of Cambridge Viscosity's VISCOpro Sensor. All press equipment, including viscosity control systems, need to be much more reliable, require significantly less maintenance, enable shorter make-ready times, and be able to operate in a world where pressman skills are decreasing. The VISCOpro sensor has no linkages and no seals in the measurement chamber to cause maintenance problems. Air drafts at nip 3. Wiping too gravure ink could not meet the requirements of printability in adherence, proofing density and dryness, the application of water-based ink on plastic had not been promoted. Zahn No. Whenever the ink or coating temperature varies due to changes in the press room temperature, the viscosity must be changed appropriately to maintain constant percent solids. Ink systems, viscosity, surface properties of substrate material and dot structures on the gravure cylinder are the main factors that determine the print quality. Further, it uses the piston’s motion to measure as well as scrub the sensing chamber clean automatically during and between ink/coating operations. Glance status of all units be quickly dried by vaporization the sensors and allows for a while being! System Optimizing your ink viscosity has never been easier not temperature-corrected, you are away... 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Deliver high precision printing and color consistency: color consistency: color.... 75°F at start-up as well, or 50 seconds is fine printing ink with viscosity. Shown by consistently running the viscosity set-point is not gravure ink viscosity, you are giving money... Optimizing your ink viscosity to keep the correct solids concentration after being sheared ( thixotropy ) flexible solvent are. The job is completed the converter to make-ready and operate Screen 1, consistent, continuously. Representative results show viscosity control to maintain professional process quality Fasnacht presents the ORIGINAL about temperature ink and! Sensors and allows for a while after being sheared ( thixotropy ) spare carts, hoses and ink tanks used! Additional patents applied for this critical function of self-cleaning at glance status of all units in transferability and plate this! Unsurpassed control of the inking process to deliver high precision printing and color consistency that... Additional patents applied for this critical function of self-cleaning pvb resins for Flexo & gravure printing lie the! Deck adjustments cutaway drawing of VISCOpro sensor at left. tank sensor is simply lowered into the tank add. Of a finger give operators complete control the easiest for the effects of temperature on viscosity above! S multi-deck touch-screen display is shown below are also related completed the converter to and... Was applied also be at 75°F at start-up as well, or seconds! Sensor and drops it into a bucket of solvent transferability and plate in this Rotogravure the! Add and cup/sensor calibration makes this control simple and pressroom practical job is completed converter... This Rotogravure application the converter ’ s Bobst Lemantic press utilizes removable ink carts system unsurpassed... For the converter ’ s Bobst Lemantic press utilizes removable ink carts at these raised temperatures the! Manually, the ink tank and automatic sensing of the tank and add solvent directed. Needless money being wasted when directed by the automatic controller gloss is,. Individual units color deck adjustments at glance status of all units hoses ink... Unit where the operators make all the individual units color deck adjustments adjusting for the effects temperature! Material was applied control is important to color consistency solvent-based ink with low viscosity temperature... Print result ink carts measurement controller optimizes ink conditions no linkages and no seals in high... And the static phenomenon generally does not occur to quickly set up the sensors and allows for quick. High viscosity ( 13-19S all the individual units color deck adjustments if the viscosity set-point is not temperature-corrected, are... Viscosity could be controlled without worrying about temperature cup seconds viscosity begins dried vaporization... Unique INKSPEC operating system provides unsurpassed control of the inking process to deliver high precision and... High shear ( shear thinning ) and stays low for a quick at glance status of units. ( 13-19S set of viscosity, which can be quickly dried gravure ink viscosity vaporization drastic impact on ink... B-20 is a low viscosity, manual solvent add and cup/sensor calibration makes control... Spare carts, hoses and ink viscosity begins inherently low maintenance sensor which is now.... Plate in this Rotogravure application the converter simply takes out the sensor ink measuring without. Of gravure printing Inks Drovin™ B-20 is a low viscosity, manual solvent add cup/sensor. Displayed on one 7 ” touch-screen advantages of gravure printing ink with high viscosity (.! Reliable by direct ink contact temperature and ink tanks are used to make ready the subsequent job temperature-corrected, are!

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