Step 2: Prepare PLUS Emulsion or Capillex Film & Coat
Starting with a degreased screen, prepare PLUS emulsion according to the instructions for the particular emulsion chosen, be it a dual-cure, SBQ, or SBQ hybrid.
DUAL CURE EMULSIONS
Dual cure emulsions require adding diazo sensitizer to the emulsion. After carefully cutting the top off the diazo packet, pour all of diazo sensitizer to the emulsion, and mix until the emulsion is a uniform color, making sure to get the sides of the pail. Leave the emulsion for 2+ hours to de-gas, the process by which the air bubbles introduced during mixing stage rise to the surface and separate from the emulsion. This is done in the pail before pouring the emulsion into your coating trough. Pour the mixture slowly to prevent bubbles and spills, then coat the mesh, being sure to apply the final coat to the squeegie side to ensure the emulsion gasket is created on the print side of the screen.
SBQ emulsions, like the Plus 9000 HB, Plus CTS L, and Plus 1 SR, come as a 1-pot solution and do not require diazo sensitizer. Out of the pail, slowly pour these emulsions into your coating trough and apply to your mesh prior to rapid exposure under your exposure unit.
SBQ HYBRID/TRIPLE CURE EMULSIONS
SBQ hybrids can be used like SBQs, but have the option to add diazo to improve water resistance. Apply diazo to the Plus LAVA or Plus AQUA like you would for a dual cure emulsion, and the diazo will increase the existing water resistance of the emulsion to provide longer runs and better reliability with water based ink.
Capillex film is easy to use and requires minimal training to create reliable results that provide the highest performing stencils in the marketplace. It comes in custom cut sheets or rolls. If needed cut your Capillex film to size using scissors on a clean surface (static will attract dust from surface if unclean). If its a large sheet, roll it up around a PVC tube to make it easier to apply evenly to your screen. If its small use a sheet of glass to help apply over the edge of a table. Start out with a degreased screen and apply the Capillex film to it using the method that makes the most sense for your sheet size. Squeegee off excess water and move to drying area.