Mesh Preparation: It is very important to remove all contamination, residual inks, cleaning chemistry, or general dirt and dust.
SCP708 Haze Remover will remove residual ink and/or emulsion.
SCP623 Screen Degreaser will help eliminate any further contaminants. Completely dry the screen before coating.
Coating: Use a clean dry coating trough that has a nick free surface for smooth coating.
• Apply one or two coats of emulsion to the print side. Rotate the frame 180 degrees and apply one or two coats of emulsion to the squeegee side.
• Additional coats may be added to the print side if thicker stencils are required.
Drying: Dry the coated screen horizontally with the print side down in a clean light safe area. The following will help to ensure complete drying:
• 86° to 104° degrees
• 30% to 50% relative humidity
• Good air circulation
The use of a screen drying cabinet with heated airflow can help in maintaining these conditions.
Exposure
Clean the film positives and vacuum frame glass prior to exposure to minimize pinholes.
Exposure is affected by mesh color, emulsion type, coating thickness, lamp type and the age of the bulb itself.
For best results use an exposure calculator to determine the correct exposure time.
Note: The use of film positives that are either frosted or have weak black density can reduce resolution and definition qualities of the coated screen.
Exposure Times
2 coats outside / 1 coat inside on 110 white mesh
6 seconds Vastex E2000 High Output LED Exposure unit
15 seconds Vastex E200 LED Exposure Unit
1:30 minutes Vastex E100 Black UV Bulbs 4 ea @ 20w
30 seconds with a 5kw light source.
2 coats outside / 1 coat inside on 230 yellow mesh
9 seconds Vastex E2000 High Output LED Exposure unit
30 seconds Vastex E200 LED Exposure Unit
2:30 minutes Vastex E100 Black UV Bulbs 4 ea @ 20w
20 seconds with a 5kw light source.
Washout Image Area:
Gently spray both sides of the screen with cold to lukewarm water, wait a few seconds to allow the emulsion to soften then wash the print side of the screen until the image is fully open.
Rinse both sides thoroughly and dry.
The use of a drying cabinet or fans is recommended to dry the screen.
Use a pressure washer on fan spray for developing the screen.
