![]() ![]() Touchup Use excess emulsion and re-expose the screen. Apply Speedball blockout with a plastic applicator squeegee or 14 ply cardboard. Blot excess water from the printing side with unprinted newspaper stock.īLOCKOUT / TOUCHUP: Blockout Before drying and exposure, use excess emulsion from the coating step to cover the blockout area. Rinse both sides with a gentle spray until no soft emulsion is left on the squeegee side, and no foam or bubbles remain. Then spray the printing side forcefully until the image areas clear. WASHOUT: Wet both sides of the screen with a gentle spray of cold water. The optimum exposure is when the emulsion first reaches its maximum color density, and the edges of the positive do not "resolve." The squeegee side emulsion is hard, not soft or slimy. Use a dehumidifier in the drying area is strongly recommended, if possible.ĭETERMINE OPTIMAL EXPOSING TIME: Make a Step Wedge or use an Exposure Calculator Kit carried through to actual printing to determine your optimum exposure time. Under humid conditions, dry the coated screen with warm, filtered air up to 104° F. Additional coats can be applied to the print side to optimize definition.ĭRY THE SCREEN: Dry screens thoroughly in a horizontal position, printing side down, at room temperature in a dirt- and dust-free area. After each coating, rotate the screen 180°. Method 2: Apply two coats on the printing side, then two coats on the squeegee side, wet-on-wet. Apply one coat of emulsion to the printing side, then one coat on the squeegee side. The coater should be at least two inches shorter that the narrow width of your screen. Wait at least one hour for the emulsion to de-bubble.ĬOAT THE SCREEN: Use the rounded edge of a scoop coater to apply an even coat of emulsion in one pass. Stir with a clean, broad, flat plastic or stainless steel instrument until the emulsion is uniform in color. Pour the fully dissolved sensitizer into the emulsion. Dissolve the diazo sensitizer powder by adding lukewarm water up to the shoulder of the bottle. SENSITIZE THE EMULSION:Handle under yellow light. It increases the surface area of fabric for a better mechanical bond of the stencil, increasing printing run length. (Mechanical roughening is an option for new fabric that is not surface treated. FABRIC PREPERATION: Used or surface treated fabric need only be degreased using Screen Systems Degreaser 5505. ![]()
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