Coating Process
Definition
Uniformly applying adhesive to the substrate surface, the core step in tape manufacturing.
Historical Background
1960s: slot-die coating achieved micron-level precision, a quantum leap in quality.
Example
Precision rollers control thickness within 0.005 mm. A 1,000 m roll needs coating weight variation within +/-2%.
Formula
Coating Weight (g/m2) = Solids Content (%) x Wet Film Thickness (um) x Density (g/cm3)
Core Concepts
Art of fluid mechanics: spreading viscous adhesive uniformly at high speed without bubbles or streaks.
Extended Applications
Lithium battery: <1% uniformity; optical: ISO Class 5 cleanliness; medical: sterile; packaging: 50-200 m/min.