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KEY-PLUS 200B Diazo Water-Resistant Photo Emulsion
Product Highlights
RoHS PASS | High resolution, fine lines | High sensitivity, short exposure time |
Excellent peelability; the screen printing plate is recyclable | It has excellent preservation stability. | Good leveling properties and fast development speed |
Product Description
KEY-PLUS 200B is a diazo-water resistant photosensitive emulsion suitable for various water-based pastes and inks used in garment printing, including table printing, semi-automatic printing, and fully automatic printing.
Product Features
| Appearance | Specification | Emulsion weight | Solid content | Viscosity (mPa·s) Type B viscometer, 25℃ | Diazo |
| Blue sticky emulsion | 1 kg | 900 g | 40 % | 8000 | KEY-PLUS 200B (3.0g) |
Performance characteristics
It has excellent water resistance and high printing durability.
It has excellent resolution and good image reproduction, and can produce fine lines and halftone graphics.
It has excellent coating performance, good leveling properties, and fast development speed.
When used in conjunction with KEY-A+B hardener, it can significantly improve printing durability.
Exposure time
| Screen type | Angle | Film thickness | Light source | Lamp distance | Optimal exposure time |
| 150S（Y） | 22.5° | 15±1µm | Ultra-high pressure mercury lamp 3 kW | 1m | 60 s |
How to use
- Sensitization: Dissolve diazonium salt in approximately 70-100 grams of pure water. Pour the diazonium solution into the photosensitive emulsion and stir thoroughly with a glass rod or wooden stick. Allow bubbles to dissipate completely before use.
- Coating: Apply using a high-quality squeegee. Coating characteristics depend on screen size and tension. Determine the number of coating passes required to achieve the desired film thickness based on print specifications. For two or more coating passes, ensure the screen from the previous pass is completely dry before proceeding; otherwise, film peeling may occur.
- Drying: Optimal drying temperature is below 40°C. Excessive heat may cause thermal reactions in the photosensitive emulsion, affecting plate-making results. Ensure screens are thoroughly dried.
- Exposure: Optimal wavelength is 300-400nm. Results are enhanced using ultra-high-pressure mercury lamps or high-pressure iodine-gallium lamps.
- Development: Use a high-pressure water gun or spray gun to flush the screen surface at a constant speed.
- Drying: After development, remove surface moisture from the screen first, then place it in a drying oven below 40°C for thorough drying. Insufficient drying may cause emulsion peeling.
- Secondary Exposure: Expose the S-side for 1-2 times the exposure time of the P-side to significantly improve print durability.
- Curing: After the screen is completely dry, evenly apply the mixed A+B curing solution to both the P and S sides. After 1-2 minutes, use an air gun to blow through the ink-flow area. Dry for 20-30 minutes to significantly improve the screen's print durability.
Transportation and storage
Transport using clean trucks, with each package stacked no more than five layers high, and the bottom layer secured with a non-slip pallet to prevent squeezing, deformation, or tipping.
Keep sealed, avoid direct sunlight and high heat.
Unopened and unsensitized, the product has a 12-month shelf life.
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