Temperature: Temperature is also a key factor. Ink drying fast 4. Cambridge’s multi-deck touch-screen display is shown below. If you are above the line, excess ink or coating material is being applied and money wasted; if below, inadequate coat weights result. 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. The use of decentralized control and an VP1500 in-tank system proved to be the easiest for the converter to make-ready and operate. 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. Up to twelve units can be displayed on one 7” touch-screen. Short body ink 2. Our unique INKSPEC operating system provides unsurpassed control of the inking process to deliver high precision printing and color consistency. When the operator was not able to pay as much attention, significantly more material was applied. Gravure Ink Viscosity Controlled! 3 cup), and the static phenomenon generally does not occur. 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. RaQ Adopting the way weight-drop method is more reliable by direct ink contact. 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. Under the normal environmental humidity, the ink printing viscosity is above 16S (Zahn No. Two screens accessible at the touch of a finger give operators complete control. In this rotogravure application the converter’s Bobst Lemantic press utilizes removable ink carts. 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. Features Excellent printability. 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. 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. Ink Viscosity Controller Weight drop viscosity measurement controller optimizes ink conditions. 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. viscosity (the ink’s resistance to flow), solvent evaporation rate (how quickly solvent evaporates from within the ink), and drying. 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 It would be great if the line of constant solids concentration were horizontal in this picture. The rugged in tank sensor is simply lowered into the ink tank and automatic sensing of the tank's ink viscosity begins. Unfortunately, it is not. 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 VISCOpro sensor has no linkages and no seals in the measurement chamber to cause maintenance problems. 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. Spare carts, hoses and ink tanks are used to make ready the subsequent job. On printing presses on which the temperature of the inks is not conditioned The color lab might be at 75°F, for instance. When the job is completed the converter simply takes out the sensor and drops it into a bucket of solvent. Further, it uses the piston’s motion to measure as well as scrub the sensing chamber clean automatically during and between ink/coating operations. Aqueous Rotogravure Ink TG-PAC Ink This aqueous gravure ink for films resolves issues concerning occupational environment hygiene, and air pollution. 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. 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. Weak Print 1. Air drafts at nip 3. Parameters of the gravure process also Wiping too Ink systems, viscosity, surface properties of substrate material and dot structures on the gravure cylinder are the main factors that determine the print quality. One button set of viscosity, manual solvent add and cup/sensor calibration makes this control simple and pressroom practical. Generates tight viscosity control to maintain professional process quality Bleeding or smearing occurs when the color spreads into your coating or adhesive. 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 main drawback is the difficulty in creating inks where the right combination of surface energies, ink surface tension and ink viscosity gives good patterning. Check oven and fountain. Therefore, if good gloss is required, then it is advisable to adopt to gravure printing ink with high viscosity (13-19S. Gravure is quite tolerant to these behaviors. 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. And in addition, ink viscosity is strongly temperature dependent. Exhibit 3: Viscosity, Temperature and Solids Concentration. 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 (Rotogravure) inks are solvent-based ink with low viscosity, which can be quickly dried by vaporization. Add clear varnish 3. 7. In the pressroom the press might also be at 75°F at start-up as well, or 50 seconds is fine. 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) Adjusting for the effects of temperature on viscosity is easily accomplished. 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. 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. On the other hand, the off process is usually unable to pick up (See photos at right). If you aren’t able to maintain the proper viscosity of your ink, it may not dry before reaching the next station on your 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. 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. This converter saved $80,000 in coating costs per year plus improved his quality and consistency by changing to Cambridge’s automatic viscosity control. PVB resins for Flexo & Gravure Printing Inks Drovin™ B-20 Drovin™ B-20 is a low viscosity grade of polyvinyl butyral resin. Each in-tank viscometer utilizes a simple, inherently low maintenance sensor which is now available. After 10 minutes of operation, however, the press might heat-up to 80°F, and after ½ hour might be 85 or 90°F. Cutaway of Cambridge Viscosity's VISCOpro Sensor. 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. 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. 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. Cells plugged with paper, At these raised temperatures, the viscosity to keep the correct solids concentration drops to 37 or 32 cup seconds. Reduce viscosity 2. 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 … Neither shear thinning nor thixotropy is required for gravure coating but 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. When the operator was not able to pay as much attention, significantly more material was applied. 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 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. 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. If you aren’t able to maintain the proper viscosity of your ink, it may not dry before reaching the next station on your … Flexible solvent lines are also inserted into the tank and add solvent when directed by the automatic controller. The advantages of gravure printing lie in the high, consistent, and continuously reproducible print result. Adjust ink drying by adding slow solvent 5. In fact, the company has additional patents applied for this critical function of self-cleaning. Fasnacht presents the ORIGINAL! It has a marked impact on the relation between viscosity and the solids concentration in the ink or coating, as shown in Exhitbit 3. 3 cup). Zahn No. Ink viscosity drops under high shear (shear thinning) and stays low for a while after being sheared (thixotropy). Each sensor had its own control at the individual unit where the operators make all the individual units color deck adjustments. High viscosity ink 1. The piston automatically cycles and cleans the sensor ink measuring chamber without operator involvement. The viscosity of a stationary ink can differ from that of a moving ink by as much as 20%! 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. 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. Representative results show viscosity control is important to color consistency. This extra margin translated directly into excess coating being applied and needless money being wasted. The strong correlation between temperature and ink viscosity suggest that fluctuations in temperature can have drastic impact on the ink viscosity. Gravure – Multi Station System Optimizing your ink viscosity has never been easier! 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. 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. 4. 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