To print a design into a T-Shirt, we may to use several methods and the three main types of methods for T-Shirt printing are screen printing, heat transfer, and direct to garment. Of cause each method has its pros and cons in relation to the others.
Screen Printing
This is most popular method to use and also one of
the easiest mainly because it requires the least amount of tools to accomplish.
When screen printing, a woven mesh is used and a design in the form of a stencil
is placed on top of the mesh, which then resembles a screen. After this, the
blank T-Shirt is placed on a table underneath the screen. Then, the screen is
placed on top of the shirt and is pressed down with force while a squeegee or
roller is moved over the top of the screen which forces the ink onto the shirt
to create the design. This method is recommended when the volume of printing to
be done is mid to large, as it is fast and economical.

Heat Transfer
Heat Transfer is more complicated
process but allows for more extensive designs and will ensure the final design
is much clearer and crisper than a simple screen printed shirt. First the
design only needs to be printed using the right combination of ink, printer and
paper. After that the design is placed upon the shirt and a type of heat source is then
used to transfer the ink onto the shirt, which then dries the ink quickly and
ensures it sticks for good. The most common tool used for the heat source is a
heat press, on a production environment or a clothes iron for a homemade
product. This method is highly recommended when the volume of printing to be done is
low to mid, as it is slower and not so economical.

DTG, or Direct To Garment
This method is the
newest type of printing, and slowly but surely has become a method used by many
major manufacturers of T-Shirts. This is because it offers the best picture and
can allow for a variety of designs. The shirt is placed in a type of ink jet
printer and the design is then laser-printed into the T-Shirt, creating a crisp
and clear image. Volume will depend on type of DTG printer used, with the
smallest one having only one head. This method is recommended for any volume of
printing, speed and cost will depend on the DTG printer used.