PLUS MIDI is a blue, ultra fast exposing, solvent and UV ink resistant, photopolymer direct emulsion for a large format graphics. PLUS MIDI has been developed to meet the needs of the busy graphic screen printer handling large screens in automated environment, where dependability and reliability are key requirements.
- One Pot Photopolymer; no mixing required; suitable for a wide mesh range; excellent coating quality; blue colour; fast exposing; wide exposure latitude; fast washout; solvent and UV ink resistant; low Rz; easy decoating.
- One pot photopolymer for convenience; excellent coating quality, perfect for medium to finemeshes; blue colour for good contrast; fast exposing with a wide latitude; easy washout; superb resistance to solvent based and UV curable inks; excellent print definition; good press life; fast decoating.
- PLUS MIDI has been formulated specifically for DMD Computer to Screen direct exposure, high power projection exposure systems and large format contact exposure, and is primarily intended for large format graphics applications using solvent based and UV curing inks.
WORKING INSTRUCTIONS AND SAFE HANDLING
Unlike conventional diazo sensitised emulsions, PLUS MIDI does not require sensitising prior to use. Always read the Safety Data Sheet before using this product.
SAFE LIGHT WORKING
PLUS MIDI is extremely sensitive to UV light and will ‘fog’ easily unless handled under good yellow safelight conditions. Similarly, coated screens must be handled under the same safelight conditions. Always store the product in original container, replacing lid after use.
For more information on mesh preparation, follow this link: How to Guide – Mesh preparation for PLUS emulsions
COATING & DRYING
PLUS MIDI is intended for medium to fine mesh counts, between 90 and 165 threads/cm. For CTS applications it is recommended that white mesh is used for optimum through-cure; however dyed mesh can also be used, but a longer exposure time will be required.
- Coat the print side first followed by the squeegee side. Typically a 1+1 coating is sufficient for large format graphics.
- The screen should be dried at a maximum temperature of 30°C (86°F). Take care to store the screen under dark or yellow light conditions.
- The screen must be fully dried to ensure good exposure performance. If the screen has been stored outside of the drying cabinet it is good practice to re-dry prior to exposure to remove any moisture that may be in the coating
For more information on coating, follow this link: How to Guide – Coating PLUS emulsions
CORRECT EXPOSURE IS ESSENTIAL FOR OPTIMUM STENCIL PERFORMANCE. UNDEREXPOSURE WILL GIVE A WEAK STENCIL AND REDUCE RESISTANCE.
Exposure times will be dependent on the particular exposure or CTS unit used, mesh count and coating thickness.
The Autotype Exposure Calculator can be used for determining the correct exposure time on a contact exposure unit, if using a CTS unit then use the CTS manufacturer’s recommended method.
For more information on exposure, follow this link: How to Guide – Exposing PLUS emulsions
WASHOUT & DRYING
Wash out the screen from both sides with a strong spray of water. Continue the washout until all parts of the image appear clean and sharp. Dry at a maximum temperature of 30°C (86°F).
Spot out blemishes with Regular Filler.
Remove ink from the screen with Autosolve Graphics Screen Wash. Apply Autostrip to both sides of the screen. Leave standing for 5 minutes. The stencil can then be removed with a strong water jet or high pressure stripper. If a stain or ghost image still remains, use Autokleen Plus or Quick Clean.
For more information on decoating, follow this link: How to Guide – Decoating PLUS emulsions