To clean a screen printing screen, you must remove the residual ink and, if you plan to reuse the screen with a new design (reclaim it), remove the emulsion stencil.
The process typically begins with removing the ink. As stated in the video reference about reclaiming screens, the first step is to remove any ink from the screen. Removing the ink immediately after printing prevents it from drying and hardening, which makes the subsequent cleaning steps much easier.
Key Steps for Cleaning & Reclaiming Screen Printing Screens
Cleaning a screen can involve just removing the ink for short-term storage, or a full reclaiming process to strip the emulsion and prepare it for a new stencil.
1. Ink Removal
This is the critical first step, as highlighted by the reference.
- Why remove ink first? Dried ink is very difficult to remove and can block the mesh.
- How to remove ink: Use a spatula or ink scoop to scrape off as much excess ink as possible from both sides of the screen and return it to the ink container. Then, use an appropriate ink remover or solvent specifically designed for the type of ink you used (e.g., water-based, plastisol). Apply the remover with a rag or brush and wipe the screen clean.
2. Emulsion Removal (for Reclaiming)
If you need to reuse the screen for a different design, you must remove the hardened emulsion stencil.
- Process: Apply an emulsion remover chemical to both sides of the screen. Allow it to sit for the recommended time (check the product instructions), but do not let it dry on the screen.
- Washing: Use a pressure washer to forcefully spray the emulsion from the mesh. Start from the top and work your way down, focusing on areas where the stencil was. A strong stream of water is essential for this step.
3. Haze/Ghost Image Removal (Optional)
After removing ink and emulsion, you might see a faint "ghost image" or haze left by ink stains or residue.
- Process: Apply a haze remover or screen degreaser product. Scrub the screen gently with a brush and rinse thoroughly.
4. Degreasing & Rinsing
Even if you don't use a haze remover, a final degreasing step is recommended to ensure the mesh is perfectly clean and ready for new emulsion.
- Process: Apply a screen degreaser, scrub lightly, and rinse the screen completely with water. Ensure all chemical residues are gone.
- Drying: Allow the screen to dry completely in a dust-free environment before applying new emulsion.
Essential Cleaning Supplies
Proper cleaning requires the right tools and chemicals:
- Spatula or Ink Scoop
- Ink Remover/Solvent (specific to ink type)
- Rags or shop towels
- Emulsion Remover
- Pressure Washer or Strong Water Hose
- Scrub Brush
- Haze Remover/Degreaser (Optional but recommended)
- Gloves and Eye Protection
By following these steps, starting with the crucial removal of ink, you can effectively clean your screen printing screens and prepare them for future use.
