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Experimental and numerical analysis of the drop-on-demand inkjet was conducted to determine the jetting characteristics and meniscus motion under the control of the ink supply pressure. A single transparent nozzle inkjet head driven by a piezoelectric actuator was used to eject droplets. To control ink supply pressure, the pressure of the air in the reservoir was regulated by a dual valve pressure controller. The inkjet performance and the motion of the meniscus were evaluated by visualization and numerical simulation. A two-dimensional axisymmetric numerical simulation with the dynamic mesh method was performed to simulate the inkjet dynamics, including the actual deformation of the piezoelectric actuator. Numerical simulation showed good agreement with the experimental results of droplet velocity and volume with an accuracy of 87.1%. Both the experimental and simulation results showed that the drop volume and velocity were linearly proportional to the voltage change. For the specific voltages, an analysis of the effect of the ink supply pressure control was conducted. At the maximum negative pressure, −3 kPa, the average velocity reductions were 0.558 and 0.392 m/s in the experiment and simulation, respectively, which were 18.7 and 11.6% less than those of the uncontrolled case of 0 kPa. Therefore, the simulation environment capable of simulating the entire inkjet dynamics, including meniscus movement regarded to be successfully established. The average volume reductions were 18.7 and 6.97 pL for the experiment and simulation, respectively, which were 21.7 and 9.17% less than those of the uncontrolled case. In the results of the meniscus motion simulation, the damping of the residual vibration agreed well with the experimental results according to the ink supply pressure change. Reducing the ink supply pressure reduced the speed and volume, improved the damping of residual vibrations, and suppressed satellite drops. Decreasing ink supply pressure can be expected to improve the stability and productivity of inkjet printing.

Rotary letterpress was the first process to use ink bins, whereby ink flowed by gravity through a funnel in the bottom and then was pumped up to the ink fountain. This approach would not work, however, with offset inks because of their high viscosity. Fabricated Metals, with its marketing partner Pargreen Sales, introduced the pressurized tote just prior to 1980. It consisted of an air-tight container that held 7 drums or 3,000 pounds of ink. Totes were weighed when full and again when emptied, and customers paid only for the amount of ink used. However, totes were an expensive investment for inkmakers. To printers, however, these containers were a major benefit.

Unlike units permanently installed between upstream and downstream equipment, the self-standing configuration can be fed from a variety of upstream sources including handheld containers, and can straddle downstream equipment, drums, boxes or mobile bins for processing, storage or packaging. www.munsonmachinery.com STERLING SYSTEMS & CONTROLS BULK BAG PACKAGING SYSTEMS The Sterling Systems & Controls Bulk Bag Packaging Systems can fit a wide range of bag and container sizes and can be provided to weigh filled capacities of from 100lbs – 4400lbs. www.sterlingcontrols.com APEC DIGITAL LOAD CELLS WITH A DIFFERENCE The Digital Load Cells with a Difference from APEC are designed to work together to make the weight-based process control systems simple to implement. Available mounting plates and load checking hardware make these load cells easy to incorporate into almost any design. www.apecusa.com SOUTHWORTH PRODUCTS CORP. SWIFTLIFT LIFT TABLE STOCKING PROGRAM The SwiftLift program from Southworth Products Corp. is a lift table stocking program that combines the thoughtful application of modern engineering, materials planning and manufacturing technology. www.southworthproducts.com MOKON PURA-THERM SYSTEMS FOR CRITICAL PROCESSES Mokon’s Pura-Therm line features high-performing equipment designed for critical environments in the medical, pharmaceutical and food manufacturing industries. Offered as an option on the company’s continuous processors, the Readco Process Control System eliminates the multiple interfaces needed to control individual machines in a batch process in favor of a single interface offering automated, precise control over every step in the mixing process. www.readco.com GET MORE Find more products online at www.PetfoodIndustry.com.

Available in 15- to 50-pound basis weights, LEAP is FDA compliant. www.catalystpaper.com CONCETTI MODIFIED ATMOSPHERE PACKAGING BAGGING SYSTEM Concetti Modified Atmosphere Packaging automatic bagging systems is designed for producers of dry pet food and animal feed. The valve is available for Kice Models 67Q2-2 through 67Q6-2 and 68Q2 through 68Q6. www.kice.com DONALDSON COMPANY LIFETEC FILTRATION LINE Donaldson Company LifeTec filtration line is engineered for high flow rates, strength and long life, according to the manufacturer, with a variety of media options designed to remove dirt and bacteria in sterile systems. www.donaldson.com BUNTING MAGNETICS CO. A press-to-close, foldable zipper is pre-applied to film in the side gusset, creating a partial opening that forms the package’s easy-to-use resealable pour spout, allowing for mess-free and more exact pet food dispensing by consumers. www.zippak.com WITT-GASETECHNIK PATBOX DATA LOGGER The Witt-Gasetechnik Patbox data logger for pressure and temperature is a contact-free data logger.