Saati GRAFIC PU Pure Photopolymer Emulsion

For General graphic printing.

Characteristics

Blue pure photopolymer emulsion
Resistant to UV-cured, plastisol and solvent-based ink. Water resistant when post-exposed
High solids content and medium viscosity for excellent print definition on any mesh
Easy to reclaim

Features/Benefits

Pre-sensitized with no mixing required, long shelf life with consistent performance
SBQ technology, exposes 4 times faster than two part emulsions and leaves no diazo stains
Low friction stencil surface for improved durability when used with abrasive inks

Directions for Use

Handle under yellow safelight or low wattage tungsten lights. Avoid exposure to daylight, quartz/halogen lamps, cool white fluorescent lamps or discharge lamps.

Sensitizing And Mixing

Emulsion is presensitized during production and does not require mixing.

Coating

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.

Exposing

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.

Developing

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.

Post Exposing

Post expose with daylight or exposure lamp to produce a more water-resistance stencil.

Reclaiming

Remove all ink residues immediately after printing with an Ink Remover. Remove stencil with an Emulsion Remover. For stains and ghost images, use a Haze Remover followed by a pressure washer.

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

Health & Safety

Before using, refer to appropriate material safety data sheets.

® MSDS available at http://msds.saatiexpress.com

STORAGE

When sealed in the original container and stored in cool conditions, Saati Chemicals products will maintain their original properties for one year from the date of production

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