Several stages and advantages and disadvantages of dip coating

Dip coating

Dip coating refers to immersing the substrate in a tank containing the paint, removing the workpiece from the tank, and allowing it to drain. The coated sheet can then be dried by force drying or baking. This is a popular method for creating thin film coating materials in conjunction with spin coating procedures.

dipping stage

The dip coating process can generally be divided into 3 stages:

• Immersion: The substrate is immersed in the solution of the coating material at a constant speed, with as little shaking as possible

• Dwell Time: The substrate remains fully immersed and still to allow the coating material to spread itself on the substrate

• Withdrawal: The substrate is again withdrawn at a constant speed to avoid any shaking. The faster the substrate is removed from the tank, the thicker the coating material will be applied to the board.

pros and cons

• Due to its simplicity, this method is suitable for automation. Film thickness is controlled by paint viscosity and rate of withdrawal from the tank. Dip tanks come in a variety of shapes and sizes to accommodate the largest objects to be coated.

• Dip coating also has its disadvantages, including: light parts tend to float off the conveyor; film thickness can vary from top to bottom (the "wedge effect"); a fat edge appears on the bottom of the part when excess coating is lost; and Solvent vapor reflux over the tank removed some of the coating.