Screen printing is a very tedious and time-consuming task. This process includes washing out, cleaning and coating screens. For this entire process, you will need a dedicated shop. And for this, we have a dedicated an entire article for coating a screen for screen printing.
A washout sink:
First things first. For coating a screen you will need a dedicated washout sink with both cold and hot water available. You will also require a filter system to remove other wastes and other impurities. If you already have a septic tank you might want check with a local expert with the chemicals you will be using might be harmful to your tank. You need to need use tepid water so it is necessary that you have both hot and cold water.
Choosing the right edge screen:
There are two options available as far as the edge of the screens is concerned, round edge and sharp edge. Experts prefer using rounded edge screens with a mesh count from 60 to 140 and sharp edge screen with a mesh count of 162. The reason for this is, for most jobs which involve fine details and small halftones don’t require a deposit of heavy ink. Also, you should be able to wash out the image on the screen easily.
Do not overfill or you might spoil the emulsion because of its tendency to run off the sides. For this fill the coater only up to three fourth. It is also a good idea to use a table covered with old newspapers while doing screen printing. This will ensure an easy cleanup. After filling the emulsion started on the print side while tilting the screen for about 30 degrees. Place the coater in such a way that it will allow the emulsion to touch the screen. Now turn the screen upside down and repeat the same process but only apply one coat of emulsion this time.
Using scoop coater:
It is very important that you use scoop coater while doing emulsion. A scoop coater is generally made up of aluminum trough made specially to hold emulsion from spreading during the coating process on the screen. Instead of using scoop coater if you use cardboard to apply emulsion it will result in a mess. These are some of the important steps that you need to follow before you start coating.
Coating the screen:
Before you start any screen make sure you have safe lighting. Yellow bugs lighting will also work wonderfully. As emulsion is photosensitive you should not have normal lighting in the room. This will expose the emulsion and it will not work properly. If your room has windows than coat the windows properly. This will prevent the light entering your room. Also, make sure you switch off the regular lighting. Read More