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FLEXO Magazine : August 2013
VISCOSITY & pH CONTROL To insure consistent and optimal ink flow, many converters opt for a viscosity control system, and in the case of water- based inks, a pH control system. In some instances, con- verters have temperature-controlled ink systems, where the ambient temperature and humidity vary greatly throughout the year. The viscosity control system can help deliver high preci- sion printing and color consistency when used properly. Its effective use can lead to substantial ink and time savings. The most popular systems today are built-in units offered jointly by press manufacturers and original equipment manufacturers (OEMs) that include virtually maintenance-free viscometers with no moving parts. Water-based inks require effective pH control. There are good systems to achieve this level of control as well, which feature a pH sensor and an extra valve for pH correction. Many different system configurations are possible, includ- ing special press integrated systems, where the supervision software is integrated into the main press control, hence eliminating the need for an additional computer. This has a big advantage in eliminating clutter for the operator and increasing production efficiency. OTHER OpTIONS When configuring a flexo press, other options for convert- ers to consider are slitting, in-line processes, such as back- side flexo, in-line registered cold seal with a rotogravure unit, frontside lacquer or in-line solventless lamination; to name the most popular ones. Slitting options range from a basic razor slit, which is fine for most applications, to rotary shear slitters for paper and laminate applications. Trim suction tubes and an exhaust blower with tubing to a recycling container usually complete the slitting package. Many applications that provide niche products are capital intensive, so knowledge about the current market segments served and where they are heading is essential. Backside printing with a flexo deck is popular in paper and carton ap- plications, while registered cold seal is primarily used in con- fectionery and energy bar wrappers. Lacquer coats are used in carton board applications, and solventless lamination is usually used extensively for bottle labels. Convenience for the 62 FLEXO august 2013 www.flexography.org SL Lamination, Dry bond Lamination, Wet Bond Lamination, PSA, Cold Seal, Primers, Heat Seals, Lacquering, Thermoplastics, Energy Cured, more coatings... Flexible packaging, Pharmaceutical, Security, Thermal insulation, Photovoltaic, Windows film, Tamper evident, Wiring, Labels, Wine caps, and more industries... NORDMECCANICA Spa Strada dell’Orsina, 16 29100 Piacenza - Italy phone 0039 0523 596411 telefax 0039 0523 612051 email@example.com NORDMECCANICA N.A., Ltd. 250H Executive Drive, Edgewood 11717 New York - Usa phone 001 631 2429898 - telefax 001 631 2429899 firstname.lastname@example.org Nordmeccanica N.A. Ltd is a full service company for USA, CANADA and MEXICO www.nordmeccanica.com Frequently demanded 100 percent print inspection systems offer color, spot, streak, register and other assessments. Photo: aVt / Flexotecnica.