Murakami Aqua Sol HS Photopolymer Emulsion – Works With Plastisol High Density Inks

Murakami

Murakami Aquasol HS is designed to produce thick stencil screens. Coat twice on print side, 4-6 times on the squeegee side wet onto wet coating to achieve a 200-350 micron thick stencil. Thicker stencils are possible by the dry/coat/dry method to build up the emulsion thickness to desired EOM.  HS is designed for printing High Density Inks, Gels, Glitters, Puff Inks, and other Thick Stencil applications.

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SKU: MUR HS Category:

Applications:

  • Pure Photopolymer emulsion for Plastisol Discharge and Water-based textile ink systems.

Physical Properties:

  • Blue colored PVA-SBQ Pure Photopolymer Direct Emulsion
  • Pre-sensitized for immediate use
  • Fast exposures, 3-5x faster than diazo based emulsions
  • Excellent for use with Plastisol, Discharge and Water-based ink systems
  • Virtually pin hole and fish eye free
  • Extremely durable on press
  • Suitable for use with water based inks when hardened with Murakami Hardeners
  • Outstanding resolution and definition properties
  • 42% solids content

Handling:  Handle under yellow safelights. Avoid exposure to sunlight, flourescent and incandescent lights.

Sensitizing: SBQ photopolymer emulsion is ready to use. There is no need to add sensitizer.

Mesh Preparation: It is important to remove any contamination, residual inks, cleaning chemistry, or general dirt and dust. Murakami 701 Haze/Ghost Remover (a non-caustic water soluble liquid) will remove residual ink and/or emulsion.  Screen Degreaser will help eliminate any further contaminants. Completely dry the screen before coating

Coating Procedure:

  • Use a clean dry coating trough that has a dent free surface for smooth coating.
  •  Apply one coat of emulsion to the print side, then apply 1 or more coats to squeegee side wet onto wet, no drying between coats is needed. Use dull side of coater.
  •  Coat slowly by hand, or the following chart gives stencil thicknesses using an auto coater.

Drying:  Dry the coated screen horizontally with the print side down in a clean light safe area.

The following will help to ensure complete drying:

  • 86° to 104° degrees F (30° to 40° C)
  • 30% to 50% relative humidity
  • Strong air circulation

The use of a screen drying cabinet with heated airflow can help in maintaining these conditions.

Exposure:  Clean the film positives and vacuum frame glass prior to exposure to minimize pinholes. Exposure is affected by mesh color, emulsion type, coating thickness, lamp type and the age of the bulb itself. For best results use an exposure calculator to determine the correct
exposure time. It is important that a lamp designed for exposing screen printing emulsions is utilized. Note: The use of film positives that are either frosted or have weak black density can reduce resolution and definition qualities of the devloped screen.  1 Minute per 100 mIcrons of stencil thickness. See previous page for approximate thickness values using an auto coater, hand coating thickness may vary depending on speed coater angle and pressure used.

Note: All exposure times listed above are suggested times using a 5KW Metal Halide lamp at a distance of 40”.

Washout:  Gently spray both sides of the screen with lukewarm water, wait a few seconds to allow emulsion to soften then wash print side of screen until image is fully open. Rinse both sides thoroughly and dry. The use of a drying cabinet or fans is recommended to dry the screen.

Storage and Handling:  Store the emulsion in a cool dry area. Un-sensitized emulsion has a shelf life of at least one year when stored at room temperature.  Use Murakami PVA-SBQ emulsion within one year for best results.  Coated screens may be stored for up to one month when kept under the following conditions.

  • 59° to 77° degrees F (15° to 25° C)
  • 30% to 50% relative humidity

Special Applications:  Aquasol HS is designed to create thick stencils. It can be coated wet onto wet up to 5 times and achieve a 335 micron thick stencil. Additional coats can be added after drying to increase thickness, make sure to dry between coats.

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