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FLEXO Magazine : June 2011
Technologies & Techniques But what about doctor blades...how can a pressroom select the doctor blade most compatible with today ’s techni- cally advanced anilox roll surfaces? What factors should be considered to assure precise efficient metering? To answer these questions, we must understand the fundamentals of ink transfer, especially as it relates to minimizing the anilox ink film. The core purpose of a doctor blade is to remove excess ink from an anilox roll’s surface. The following are the basic rules of engagement between a doctor blade and an anilox roll surface. • First, the contact area between the blade and anilox roll surface should be kept to a minimum. It results in less wear to the anilox surface and reduces hydraulic push back of ink, thereby making a thin ink film possible. • Next, the doctor blade material should not harm the anilox roll by contributing to unnecessary wear or by causing score lines in the anilox surface. While these two points are simple enough to understand, achieving them has always been a challenge. When it comes to achieving minimum blade to anilox roll contact area, the actual blade contact area is determined by the following factors: • Blade edge at contact point is determined by edge type. See Figure 1. • Thickness of the doctor blade material. Figure 1: From Top, Bevel, Radius and lamella edge types Experience the science behind the service with Proline® anilox rolls Praxair Proline® laser engraved ceramic rolls deliver quality your printing operation can depend on. Whether you need extended life, improved ink laydown, better opacity, or more repeatable print results, Praxair Proline® series of engravings is for you. Our ART (Anilox Reverse Technology) and REV (Revolutionary Engraving) cell shapes and configurations continue our history of technical innovation to the flexographic industry that began with the introduction of the first laser engraved ceramic roll to the printing industry almost 30 years ago. You can see the results every time the press rolls. Improved printing quality. Consistent reproduction. Reduced maintenance downtime. And, better profitability. www.praxair.com/printing Call 1-800 -234-3131 for information on how we can help your business. www.flexography.org June 2011 FLeXO 43
Sustainable Spring 2011