903WR Photo Emulsion For Water-Based and Plastisol Ink
903WR Photo Emulsion is a fast drying photopolymer emulsion. 903WR is recommended for Plastisol and water-based ink systems. For water-based ink system, a hardener is recommended for a longer run. screening supplies store offers a two-part hardener that would enhance the durability of the emulsion film for a very long run after using two part Hardener- the only drawback is that the screen then can not be reclaimed, if you used two part hardener, otherwise the reclaiming of 903 WR the cured film is easy; the screen may be reclaimed with our stripper (XER). Add Diazo at room temperature, shake long enough till Diazo powder is completely dissolved and then add the solution to the photo emulsion. mix well into the emulsion and let stand for at least 30 minutes to release any air bubbles that may have been formed.It is advisable to use press or ink wash and ink-degradent that are meant for Plastisol ink. Avoid using acetone or mineral spirit as they may lock in the emulsion film.
Preparation of Screen for Photo Emulsion:
clean the screen with degreaser and let it dry completely
add water to the Diazo bottle & shake for a minute or so making sure that all of Daizo is dissolved
you may apply one coat of emulsion with Diazo on the squeegee side and one on the print side or two coats on each side starting from the print side. the more coats you put on heavier stencil will be achieved. with a heavier stencil, the exposure time will be increased. let the emulsion film dry and then you wash the screen with a mist of water to open the image area. get all the water by air or by blotting otherwise the residue of emulsion may run into the image area, blocking the ink. look for any pinholes. 903WR does not usually yield any pinholes if exposed within the optimum exposure limits. if there are pinholes use block-out to close the pin holes.xenon products has an excellent block-out for this purpose..
- broad spectrum of exposure limits, longer latitude
- good resolution
- good edge definition
- perfect mesh bridging
- fast drying
- longer print capabilities with great durability
- easy reclaiming
- excellent humidity resistance
- color: Blue
- viscosity: 13,000/15,000 cps at 20 rpm
- solids: 42% + -1%
- solubility: water
Distance for the exposure should be about one and a half times the diagonal measurement of the artwork from point light sources. yellow & orange mesh requires at least 50% more time than white mesh. the times given below are based on white 110 white mesh approximately 40 inches.
- Metal Halide: 75 seconds for 1000 watts / 35 seconds for 3000 watts /25 seconds for 5000 watts
- carbon arc 275 seconds for 15 amps/ 150 seconds for 30 amps/ 85 seconds for 60 amps /
- fluor. tubes 260 seconds for 40 watt