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FLEXO Magazine : November 2007
[ PRODUCT TREN I _ - TABLE A. AIR MANDREL DIAMETER less than 121.074 mm/4.676 in. 121.074 mm - 248.398mm/ 4.767 in. - 9.779 in. greater than 248.398 mm/9.779 in. DIAMETER OF AIR HOLES (LEADING EDGE) = 2.0 MM # OF AIR HOLES (LEADING EDGE) 4 6 8 OTHER KEY FACTORS There are several things to consider in stan- dardizing air cylinders (see Figure 1). These in- clude the placement of a IS-degree bevel on the operator side/leading edge of the mandrel. The bevel may seem insignificant, but serves a useful purpose in helping get the sleeve started on the cylinder when mounting. The seal face is critically important, particu- larly for those printers utilizing pass through bridge mandrel designs. The seal face is the distance between the top of the bevel and the leading edge of the air holes. This area creates the initial seal or cushion of air under the sleeve that allows the sleeve to slide onto the mandrel. The optimum distance for the seal face is between 10 and 12 mm (.39 and .47 in). If the distance is less than 10 mm, it could cause the air to bleed out through the bevel instead of travelling down the face length of the cylinder. The loss of air under the sleeve usually results in a tight fit, or worse, a sleeve that will not mount on the cylinder. Last but not least is the register pin. Register pins are commonly used on all sleeve-dedicated presses, and the recommended height of the pin is 2.5 mm (.098 in.), +/-.1 mm. The information above can, and should be used for printers utilizing cylinder presses and sleeves. There is ultimately no difference be- tween a cylinder press and a servo-sleeve press when it comes to the air cylinders; the same specifications apply to ensure optimum mount- ing of your print sleeves. In conclusion, taking the steps to implement a standard specification for air cylinders within the flexographic industry benefits everyone, printer and supplier alike. As today's printers move toward sleeve technology, the air cylinder will continue to playa critical role in the process. Doesn't it make sense to standardize? . Diameter of Air Holes in the middle of the Air Mandrel = 1.2 mm Cylinder Face Length: Less than 1000 mm/39.3 in. = 1 x air hole (middle of the cylinder) 1000 to 1500 mm/39.3 in. to 59 in. = 1 x air hole at 500 mm Greater than 1500 mm/59 in. = 1 x air hole at 500 mm + I x air hole at 1000 mm *Measured from user/operator side Quantity of downstream air holes per location is two, located 180 degrees apart ABOUT THE AUTHOR: Bill Bower is director of sales and marketing for Rotec North America. i íYMID AccuMount >> - Q) ... -C C ca E Q) -oJ) -C -- ... .Q >>> DESIGN SPECIFICATIONS . Specifically designed for cantilevered, fixed mandrel, or "sleeved" presses . Solid urethane caps to prevent damage to cylinder ends and "sear' ends to resist ..wicking" of solvent or moisture . Aluminum end caps available upon request . Notcn mechanically locked In place . Internal air or thru-hole air supply available . Available thicknesses between .400" and 3.500" >>> FEATURES & BENEFITS . Lightweight design for ease of handling . Robust construction for long life . Chemically resistant. replaceable outer surface for extended life . Registration notch and pin included . Scribe line available upon request Reduce capital investment through use of thin sleeves with bridge mandrel repeat buildelS. Xymid, LLC 5141 Craig Rath Blvd. Midlothian, VA 23112 804-774-5229' fax 804-774-5331 xymidllc.com