Before applying PHOTO EMULSION to a new screen, make sure that it has
been properly DEGREASED to remove all traces of oil, dust, fingerprints
and chemicals. Rinse off DEGREASER and allow screen to dry
in a dust free area.
2. Apply sensitized PHOTO EMULSION (follow instructions
on the package) evenly to both sides of the
degreased screen with a good applicator (coating
trough). Concentrate on the print area as the outer area can be blocked
at a later stage. Additional coats can be applied after the photo
emulsion is dry to build up the stencil thickness.
3. Once the PHOTO EMULSION has dried in a dust free
darkroom (a room with a yellow globe and
blacked out windows will suffice) it is now ready for exposurem
under a suitable UV light source. The exposure time varies according
to the wattage of the light source, the distance from the screen
and the MESH count & colour. A Mercury Vapour
lamp (750W or higher) or Metal Halide (2000W
or higher) makes an excellent light source for problem
free exposures. Once the screen is exposed - rinse out the screen with
water. Problems will occur if the screen is under-exposed or over- exposed,
so do a time-test to ascertain the best exposure time for you
light source and mesh. Tough up pinholes with suitable screen filler.
4. The screen is now ready for SCREEN PRINTING.
5. After you have completed the print run - remove
excess ink and clean with a suitable screen
6. To remove the PHOTO EMULSION after you have
completed the print job, use a DECOAT
POWDER solution (see packet for mixing instructions). The
solution should be used on both sides of the screen and allow activity
time for the chemical to react before
blasting off with a HIGH PRESSURE WATER
JET SPRAY GUN (100 bar pressure or more). Do not allow the chemical
to dry on the screen.
7. Now apply CLEANER PASTE (a caustic based cleaner
- use chemical resistant rubber gloves)
to both sides of the screen with a soft cloth. Allow activity
time before blasting off with a high pressure spray gun. Do not allow
the chemical to dry on the screen.
8. To remove the stain (or ghost image) from
the screen, apply K4 Image Remover
to both sides of the screen. Allow activity time before blasting off
with a high pressure spray gun.
Do not allow the chemical to dry on the screen.
9. Rinse off all traces of the chemicals and
store for the next print job.
10. Before applying PHOTO EMULSION to a reclaimed screen,
degrease the MESH and continue with