Ulano Screen Making Products

CDF Film Troubleshooting

Problem Possible Cause Solution
Stencil peels or washes away during washout Underexposure Perform a Step Wedge Test
Poor fabric preparation Degrease steel and metalized polyester; abrade and degrease synthetics
Residual moisture in stencil during exposure Under humid conditions, stencil may require additional drying after backing sheet removal
Washout temperature is excessive Stay below 40°C (104°F)
Silk or cotton organdy Use only synthetics, stainless steel, or metalized polyester
Air pockets during adhesion Fabric not wet enough Mesh openings must be filled with water; rinse just before adhering; check fabric preparation; use vertical, newsprint technique for thin CDF®s and fine mesh
Poor fabric preparation Degrease steel and metalized polyester; roughen and degrease synthetics
Poor fabric stretching Upgrade stretching method
Adhering surface not flat Use completely flat surface
Irregular or missing squeegee stroke Use sharp-edged, medium hardness squeegee with slow steady stroke, without excessive pressure
Stencil breakdown Underexposure Perform a Step Wedge Test
Poor fabric preparation Degrease steel and metalized polyester; roughen and degrease synthetics
Solvents too agressive Coat squeegee side with 569FAST; use CDF®/LX or CDF®/QSR film
Needs mechanical reinforcing layer Coat squeegee side with FX88 (RLX for CDF®/LX, QFX for CDF®/QSR or QTX for CDF®/QT)
Aqueous or water-containing ink Use CDF®/LX series or CDF®/QT
Poor definition (edge sharpness) Waiting too long before squeegee stroke Have squeegee ready after film contacts wet mesh
Mesh too coarse for film Use thicker film; stencil thickness must be related to mesh count
Underexposure Perform a Step Wedge Test
Incomplete washout Wash out thoroughly from both sides
Poor Resolution (fine details) Positives lack density Remake positives
Pre-exposure Work under safelights; store coated screens in dark
Poor exposure contact Check vaccuum
Poor light source Upgrade light source; increase exposure distance if possible
Mesh too coarse Use finer mesh
Film too thick Use thinner film
Overexposure Perform Step Wedge Test
Pinholes Dirt and dust Clean positives and contact glass; remove backing just before exposure; dust film emulsion before adhering
Underexposure Perform a Step Wedge Test
Solvents too aggressive Coat on squeegee side with 569FAST; use CDF®/LX or CDF®/QSR series film
Poor fabric preparation Check preparation; adhere as soon as possible after the degreasing rinse
Difficulty reclaiming Underexposure Increase exposure to fully "cure" emulsion
Wrong stencil remover Use only Ulano No. 4, diluted No. 44, No. 42, or No. 5
Solvents too aggressive Coat on squeegee side with 569FAST; use CDF®/LX or CDF®/QSR series film
Thicker stencil needed Mesh too coarse Use finer mesh, if possible; use thicker CDF® Direct-Film; use Direct/Indirect Method, or Lamination Technique