Uncoated offset paper

Discussion in 'Offset Papers & Stocks' started by Andrei83, Jan 28, 2020.

  1. Andrei83

    Andrei83 Member

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    Hello dear offset printing specialists, Technologists. There is a question why the paint dries very long on such paper? Traditional sheet offset. Ph of water 5.0-5.3 all indicators are normal, and the paint on coated paper dries quickly.
     
  2. NotAGooner

    NotAGooner Senior Member

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    Add a small drop of Cobalt drier 0.5% or paste drier to your ink, it's normal for uncoated papers to take longer in drying.
     
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  3. Andrei83

    Andrei83 Member

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    This is logical, but does not explain the reason for long drying.
     

  4. printerdan

    printerdan Member

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    Think of uncoated paper as a sponge. The vehicle of ink is what dries, it's oils, but uncoated paper draws those oils into the sheet minimizing their contact with air. There is little absorbtion on coated paper; the vehicle and pigment cure on the surface.
     
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