Printing Process
When you think about it, it is amazing how easy it is today to print on a sheet of
paper, and how hard it is to print on cloth. Anyone can buy a laser printer or an
inkjet printer for a couple hundred dollars and print on paper all day long at
rates up to 10 sheets a minute. On the other hand, you would be really lucky to
print one T-shirt every five minutes -- the machine is also going to cost a lot
more, and you will have to do each one by hand!
In the traditional silk-screening approach, you start with a square wooden frame
about the size of a T-shirt. Over this frame you tightly stretch a piece of sheer
fabric (originally silk, now polyester). This is the screen. Over this sheer fabric
you put a thin sheet of plastic into which you have cut holes where you want ink
to appear on the T-shirt. You can either cut the holes with a scalpel (an arduous
task), or you can use a liquid plastic coating that's sensitive to ultraviolet light
and "cut" the holes with light.
Next, you place your T-shirt on a flat board and press the screen onto the fabric.
By coating the screen with thick ink using a sponge, you cause the ink to flow
through the screen onto the T-shirt. For multi-color designs, you do this multiple
times, starting with the lightest color and moving up to the darkest.

"Your T-Shirt Printing Solution"