![]() ![]() Common Coating Challenges: How Wire-wound & Rollformed Rods Compare These benefits are often realized immediately upon the transition from wire-wound to rollformed metering rods. There are no wires to break and no tight spaces between wires to collect dried coating, large coating particles, and air bubbles. In addition, rollformed or grooved rods are more durable, easier to clean, and have a more uniform surface than their wire-wound counterparts. In most cases, optimizing the thread on your metering rod will increase coating quality and efficiency. But unlike wire, the shape of the thread profile on a rollformed or grooved rod can be custom engineered and manipulated to precisely control critical rod performance variables, tailoring the rod to a specific coating application. Gaining Control of Critical Rod Performance Variablesīoth wire-wound and grooved rods control application volume by the area of the valleys between the wires or thread peaks. Figure 1īy allowing users to more precisely control their coating application and extend rod life, rollformed rods transformed the paper coating process and set a new standard for the industry. Unlike wire-wound rods, which are limited to a profile consisting of round cross-sections positioned side by side, the shape of the rollformed profile, or thread shape, can be adjusted to fit the requirements of the application, as shown in Figure 1. Then, in the 1980s, rollformed metering rods were invented, with engineered threads built into the rods themselves. Wire-wound rods were the metering rod standard for paper coating for decades. How Rollformed Metering Rods Modernized Paper Coating To effectively apply these types of coatings in more complex applications – and meet increasingly stringent quality standards demanded by their customers – more and more paper mills, linerboard manufacturers, and converters are transitioning to rollformed, or grooved rods.Īre wire-wound rods still the right choice for your coating operation or should you switch to rollformed rods? How difficult is the transition? Modern paper coatings are more abrasive, contain higher percentages of solids, and coat a much larger variety of substrates. More than 100 years after wire-wound coating rods, or “Mayer” rods, were invented, they are still in use in some paper coating operations.īut as coating applications have evolved and performance requirements become more demanding, today’s users are finding that wire-wound Mayer rods increasingly fall short of their needs.
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