Rod coating provides excellent accuracy and uniformity through a wide range of speeds at a low cost that is simple to setup and change over. Mayer rod coating has been and still is in the top three most popular coating methods.
Yes, rotating the rod will prevent uneven wear. Rotating the rod will also present a relatively clean rod surface to the substrate.
Normally the rod rotates against the web. However, rotating the rod with the web may result in a better finish for some coatings.
25 to 50 rpm is a good starting point. Rotate the rod faster to see if the coating finish improves.
Every application is different but most coaters operate with 5 to 15 degrees of wrap. The most flexible coaters will be able to adjust the wrap angle for different applications.
Yes, if the size change is significant enough to prevent the rod from laying flat on the rod bed. (Note that with a 60 degree V-groove rod bed, any increase in diameter will cause an equal increase in rod height).
The U-shaped groove of a formed rod cleans up easier than its wire wound counterpart. Unlike wire wound rods, the diameter of a formed rod increases very little from a small groove size to a larger one. Formed rods are generally less expensive at high volumes.
The cavity between wire windings is a V-shape while the formed rod has a U-shaped groove. Coating flows through the shapes differently so the actual transfer rate depends largely on coating rheology.
None, the coating thickness is determined by the wire (or groove) size.
Since rods are generally made of solid stainless steel, the rod diameter will have a drastic affect on rod price. The need for a rod holder depends upon rod diameter (and several other factors).
Use the size selection chart to find an appropriate starting point. Perform a test with that size (in the lab preferably) and measure the actual film thickness. Use the actual transfer rate (wire size to film thickness) to refine your size selection.
No, the rod should not be allowed to rotate during a drawdown. Hold the rod steady and pull the coating down the sheet with consistent speed and even pressure.
Yes, RDS can provide rods for nearly any coater or drawdown machine. Simply request a quote and specify the coater/machine make and model.
There is no minimum for wire wound rods. There is a 5 rod minimum per size for formed rods (or a $35 setup charge per size).
Our standard lead time is 1 to 2 weeks after receipt of order. We offer stocking programs for higher volume users. If you need an order sooner please contact us about expediting.
Yes, RDS accepts Visa, MasterCard and American Express.