Standard Laboratory Drawdown Rods and Accu-Lab Jr. Laboratory Drawdown Rods utilize a wire wrapping which is what controls the coating thickness. ![]() You must select the wire size for your specific coating thickness requirement. See the chart and selection notes on the bottom of this page for guidance.įor users that require a coating path of up to 12", use the standard Laboratory Drawdown Rods (N008-005 choose 1/4", 3/8", or 1/2"). With an overall length of 16", these rods are longer than the Jr. Laboratory Drawdown Rods (N008-026, N008-026A) are designed for users producing test samples up to 8" wide. These stainless steel rods are 4" shorter than conventional lab rods and offer an additional savings. Wet coating thickness can be accurately predicted within one tenth of a mil (.0001"). ![]() Rod selection tables allow coaters to consider coat weight and percent of solids in choosing the proper rod size for each production run.īottom-line profits have encouraged many coaters to modify existing machines, in order to take advantage of the flexibility, the ease of use and the dollar savings associated with rod coating. The market for wire-wound rods has grown rapidly during the past few decades, because they provide predictable, accurate coatings time after time, at a minimal cost. Although the technology goes back almost a century, today's high quality materials, multi-wire designs and special wire surfaces have made this system more popular than ever before. Wire-wound rods were first used in coating machines built by Charles Mayer in the 1900's to manufacture waxed paper and carbon paper. They are still called "Mayer Bars" by many coaters. Machined Lab Rods (N008-056, 057 & 058) are less expensive due to a different manufacturing process and all of these are 16" long with a coating path width of 12". ![]() The drawdown surface is sturdy polished glass, equal in planarity to fine mirror glass. To determine approximate wet film thickness in Mils for a specific rod number from the table below, multiply the rod number by 0.10. A steel clip holds the test chart or panel steady while the drawdown is made. These devices provide an economical and convenient means for making drawdowns of uniform film thickness. For example, the number 3 rod would be 3 x 0.10 = 0.30 Mils. The number 20 rod would be 20 x 0.10 = 2.0 Mils.įor Microns, multiply rod number by 2.54. For example the number 3 rod would be 3 x 2.54 = 7.62 Microns.
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