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Photo Emulsion-Grafic DS

Hermes Industrial Co., Ltd.

Photo Emulsion-Grafic DS

Packaging Details : 1kg/Set

Place of Origin : China

Brand Name : HermeScreen

Main Markets : Global

HS Code : 3707

Category : Plastic Drying Machinery

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Photo emulsion-grafic ds
General graphic printing.
General characteristics
Diazo emulsion resistant to UV-cured, solvent-based and plastisol ink
Very economical
Fast exposing with wide exposure latitude
Easy to reclaim
Directions for use
Handle under yellow safelight or low wattage tungstenlights. Avoid exposure to daylight, quartz/halogen lamps, cool white fluorescent lamps or discharge lamps.
Sensitizing & mixing
Prepare diazo as per instructions on the bottle. Add the entire contents to the emulsion and mix thoroughly until a smooth consistency is obtained. Write the date of sensitizing on the label and then cover the sensitized emulsion and let stand for a few hours to enable air bubbles to escape. Store sensitized emulsion in cool conditions and use within one month for best results.
Mesh preparation & degreasing
Degrease and abrade new mesh in order to optimize stencil adhesion; Dry and store the screen in a dust free, dry environment prior to coating. For more applications, thoroughly degrease the mesh prior to use.
Using a high quality scoop coater or coating through, apply one or two coats to the substrate side of the screen, followed by one or two coats on the squeegee side. For a thicker stencil, apply additional coats to the squeegee side prior to drying. For a higher quality stencil with a minimal increase in stencil thickness, apply one or two additional coats to the substrate side of the screen after the initial coats have dried.
Drying & storage
Thoroughly dry the coated screen at a maximum temperature of 104° F (40° C) in a dust free, dark or yellow light area, with the substrate side facing down to optimize stencil quality. Coated screens should be stored in a dust free, dry, safelight environment.
Ensure that all surfaces, emulsion, film and glass are free of dust to minimize pinholes. Contact the emulsion side of the positive with the substrate side of the screen and secure in position before placing the screen in a suitable vacuum frame. Many variables, such as lamp type and age, distance from lamp to screen, mesh type and coating thickness, can affect exposure time. Perform an exposure test with an exposure calculator to determinate correct exposure
Time for a complete cure.
Wet both sides of the screen with a strong, finely divided spray of water and continue washing out until all image areas are fully open. Rinse both sides of the screen and dry thoroughly before use. A properly exposed and developed screen will not leave residues on the squeegee side.
Health & safety
Before using, refer to appropriate material safety data sheets.
Problem solving
Poor coating quality
Properly clean, degrease and rinse the screen to remove all residues and traces of chemicals
Properly and evenly tension the fabric
Clean and ensure the scoop coater does not present any defect edge
Poor detail or difficulty washing out image
Ensure emulsion and coated screens are handled in safelight conditions only
Ensure a minimum vacuum of 0.66 bar (500 mmhg or 20 in hg) on vacuum gauge for optimum contact of the positive
Optimize exposure time and use only high quality film positives
Do not store sensitized emulsion or coated screen at high temperatures
Emulsion falls off, extreme pinholes or severe stencil breakdown during printing
Ensure that damp screens are not being exposed
Only expose screens with an even and consistent coating thickness
Ensure that stencil has not been severely underexposed
Ensure mixed emulsion is not too old, has been correctly sensitized and has not been stored at high temperature
Difficulty reclaiming screens
Not reclaimable once catalyzed
Optimize exposure time and properly rinse the squeegee side of the screen during developing to
Remove all residual traces, especially when using higher mesh count dyed fabric

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