Extrusion International 2-2017

31 Extrusion International 2/2017 shims are inserted, are now in the same plane as the lip face (see schematic). As in the past, body shims and offset shims are available in thicknesses ranging up to 0.060 in. (-1.524 mm). With the new design, the accu- racy of the offset adjustment is independent of body shim thickness. “Nordson’s new design for multi-layer dies makes it easier for web converters to achieve the substantial cost savings and productivity benefits obtained by applying multiple fluids in a single pass,” said Keith Wheeler, business unit director for fluid coating sys- tems. “Besides being more accurate and user-friend- ly, the new design for multi-layer dies eliminates the cause of lip misalignment and helps to prevent the costly damage to both die and roll that can result fromsimple human error in calculating the lip offset.” Replacingmultiple coating passes with a single prod- uct run means an increase in output and a reduction in machine use, energy consumption, and scrap. Ad- ditional cost savings result fromcontrol over the thick- ness of each layer, preventing over-use of expensive high-functionality fluids. At the same time, the con- verter has the flexibility of returning to single-layer production simply by closing the feed valve to the flow channel that is not in use. www.nordson.com In this rear view of a dual-layer model of Nordson’s Premier™fluid coating die, offset blocks, with offset shims protruding, are located across the width of the die. Visible on the side of the die are two flow channels that converge at the die lips