Materials needed:
• De-Coat Powder (100gm), makes 5 litre of De-Coat Liquid
• Pregan C-4 Liquid (red in colour)
• Pregan Paste
• High-pressure Water Spray
• Soft Brush or Sponge
Cleaning of Screens
Safety gloves, goggles and a respirator must be worn at all times when cleaning screens or using chemicals and solvents, working in a well-ventilated area.
To remove stencil, pre-mix 100gm De-Coat powder in 5 litres of water. Mix well. When dissolved, apply to both sides of the screen. Scrub with a soft brush or sponge on both front and back until emulsion starts to dissolve. Then blow out with high-pressure water. (Do not allow the De-Coat to dry on the screen)
While the screen is still wet, apply Pregan C-4 (red liquid) to both sides with a sponge or cloth and then add Pregan Paste. Apply Pregan Paste to both sides. Once stains come out, wash with high-pressure water. However, if there are stubborn stains, leave chemicals on for approximately
7 - 10 minutes. (Do not let it dry). Blow out with high-pressure gun, and after that rinse thoroughly with low-pressure water to make sure that you remove all chemicals.
Make sure that you spray the low-pressure water into all the corners.
Once the screen is dry, it is ready for coating with photosensitive emulsion for the next job.
N.B.
Never allow chemicals at any stage, to dry on the screen. |
