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Brief Description of the Dip Coating Process
Dip Coating:
Dip coating refers to the immersing of a substrate into a tank containing coating material, removing the
piece from the tank, and allowing it to drain. The coated piece can then be dried by force-drying or baking. It
is a popular way of creating thin film coated materials.
Stages of Dip Coating:
The dip coating process can be generally separated into 3 stages:
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Immersion: The substrate is immersed in the solution of the coating material at a constant speed
preferably judder free.
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Dwell time: The substrate remains fully immersed and motionless to allow for the coating material
to apply itself to the substrate.

Withdrawal: The substrate is withdrawn, again at a constant speed to avoid any judders. Faster the
substrate is withdrawn from the tank, thicker the coating material that will be applied to the board.
What the participant needs to develop:
Participant is required to construct an automated dip coater, which has following important innovations
(Patent in the name of participant will be filed in collaboration with Department of Physics, Banaras Hindu
University):
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Automated Dip Coater with speed controllable from as low as 1mm/30 seconds (or whatever
slowest possible without jerks and sufficient rigidity to keep substrate stable while going in and
coming out of the solution) to as high as 1cm/second.
Flexible hand fixtures of the dip coater to ensure that different sized substrates can be
accommodated (Sizes of substrates ranging from 1mm*10mm*10mm to 5mm*50mm*50mm).
The process should be automized to directly set the time required to complete the three stages of
coating that is Immersion, Dwell time and Withdrawal.
The schematic diagram of dip coater has been shown below (Note- dimensions, rigidness of design,
materials to be used, and controller to be applied are all open for the participants novel ideas):