Horizontal stripes or ripples on a coated part, known as “chattering,” ruin the final finish. The main cause of these uneven film thicknesses is not the liquid itself, but the microscopic motor vibrations coming from the dip coater.<\/p>\n\n\n\n
This article explains the physics behind why these stripes form during nano-level dip coating and how upgrading to a vibration-free dip coater eliminates the problem completely.<\/p>\n\n\n\n
Have you ever checked a finished dip-coated part and noticed horizontal stripes or ripples at regular intervals?<\/p>\n\n\n\n
This phenomenon is called “chattering.” It does not just look bad; it ruins the performance of your product. It causes inconsistent optical transmittance and uneven electrical insulation. For high-tech fields like optical devices or semiconductor materials, these stripes are fatal defects.<\/p>\n\n\n\n
Why do these ripples form during a simple pull? The culprit is “micro-vibration” during the process.<\/p>\n\n\n\n
As a part leaves the liquid, a small curve of liquid called a “meniscus” forms at the surface. If the machine vibrates, even slightly, this meniscus shakes like a wave. This shaking changes how much liquid sticks to the part from one moment to the next. Once dry, these uneven patches become visible stripes. The thinner the film, the more the smallest vibration causes major defects.<\/p>\n\n\n\n
You might think, “My machine isn’t shaking that much.” However, these vibrations are too small for the human eye to see.<\/p>\n\n\n\n
Many basic or homemade dip coaters use standard stepping motors. These motors move in discrete, jerky steps (pulse drive). At normal speeds, this is fine. But when you try to run them at the extremely slow speeds needed for dip coating, these tiny jerks travel straight to the liquid surface. This is the primary source of chattering.<\/p>\n\n\n\n
The rule to stop chattering is simple: never shake the liquid. If changing your liquid viscosity or speed does not fix the stripes, your equipment has reached its limit.<\/p>\n\n\n\n
SDI dip coaters are engineered for perfectly smooth, continuous motion. We developed proprietary drive mechanisms and advanced motor control to remove pulse vibrations entirely.<\/p>\n\n\n\n
Even at our industry-leading speed of 1 nm\/sec<\/strong>, our machines pull parts out flawlessly without causing a single ripple in the liquid. If you want a mirror-like finish that is uniform even under a microscope, choosing a vibration-free machine is the most important step.<\/p>\n\n\n\n \u25bc Check SDI’s Vibration-Free Product Lineup <\/strong>
https:\/\/www.sdicompany.com\/en\/products\/<\/a><\/p>\n\n\n\n