The Works Section.
Many
would not agree that the tricks of the trade should be shared, or even
disclosed to others. Interprint differs. We believe in sharing our trade
secrets. We believe in our work and are assured that our clients would
also prefer our work to speak rather than presentations.
This section
merely stresses on the aspect Of SCREEN PRINTING ; HOW IS IT DONE ; TIPS AND CARE
If
our section teaches someone to be better, we would consider that as
a compliment.
UNITED PRINTERS has always respected technology and has been
striving to adopt the latest and the best.
Screen Printing . How is it done ?
Tips
Screen Printing
. How is it Done ?
Once art is designed
for the project, it is color separated and sent to film. Each color
in the design will be burned (like exposing a photograph) to a separate
screen.
When art is color separated,
each color in the design is printed in black to a separate sheet of
paper. (Separations can also be shot directly to film.) Sometimes the
separations overlap (trap) slightly where the colors are touching
Color separations printed
to paper are considered camera ready. Many companies have color seps
on paper made of their logos (ad slicks). Most of the time, ad slicks
can be used for the screenprinting job at hand. Sometimes color separations
produced for a different project will not work for the particular job
in question. In that case, our creative department can help.
The screen is
prepared by coating
it with light sensitive emulsion. Then it is exposed (burned) by shooting light through the
film to the screen.
After the screen is
burned, the image resulting is washed away. The final product is a grid of open screen in the image area and closed screen everywhere
else.
The burned screens
are registered (lined
up with respect to each other) on the press. A squeegee and ink are
added, and the printing is ready to begin.
The squeegee is
pulled across the screen, pushing the ink through the open holes of the image.
The colors are printed one on top of another.
TIPS
Due to the unstable nature of cloth versus paper
screen printing garments can't reproduce fine detail with the same resolution
as offset printing. Apply your creativity with this fundamental consideration
in mind. Use those thin lines and dense details sparingly.
We recommend creating your screened artwork at 50-55
lines per inch, 65 lpi maximum.
Half tones should be kept between 12% and 88%.
Higher than 88% and dot gain will cause your
shading to fill in, below 12% and the dots tend to drop out completely.
You should expect that there
will be a 30-40% dot gain when printing on fabric, shading should be lightened accordingly.
If
you are creating your own color separations (spot color only), confirm
that each layer lines up properly. Each area of color should register
cleanly with those areas bordering it (no "trap"). Represent each separate
color layer with a black image on a white background, include registration
marks for alignment.
When printing on dark
garments allow for an extra separation layer or "underbase". Colors
will not show up well on dark fabric unless this white layer is applied
first.
Clean, dark black pen
& ink artwork is fine.
If you are laser printing
separations, pre shrink your paper or vellum. You may do this by running
the pages pages through your printer with no image, the fusion roller
will heat and shrink them. This will minimize subsequent shrinkage and
distortion as each separation is printed.
Double check that your
color assignments and layering will produce the intended results.
Scale your image to
fit the printable area of the intended press. Our standard image size
is 13" x 13", with a max. image size of 16" x 17".
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