Recent content by SteveSuffRIT

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    Feeder for about a year looking for any books or resources on offset lithography theory

    Also, see the most famous Print Planet contributor, Gordon Pritchard website. The Print Guide
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    Feeder for about a year looking for any books or resources on offset lithography theory

    Plenty of videos on YouTube to watch. Buy Pocket Pal book from International Paper. Is there another press or shift you can transfer too?
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    How to reduce total ink coverage on Fogra 39l for taccato paper

    Also, are you printing on one side only or both sides. If both sides, as perfecting with just one pass or two separate passes?
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    How to reduce total ink coverage on Fogra 39l for taccato paper

    Out of curiosity, are you using anti-setoff spray powder, or in-line AQ or water-base coating? I know you think a prepress solution is needed but there may also be other press solutions too.
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    How to reduce total ink coverage on Fogra 39l for taccato paper

    When you say you have a problem printing on Toccata paper (gloss coated), do you mean drying issues, like setoff, blocking, rubbing? Fogra 39 TIC/TAC is 300%. Steve Suffoletto
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    Missregistration between fist and second printing station.

    Irida, It is strongly recommended you run the paper with the grain parallerl to the cylinders, so grain LONG. Steve Suffoletto
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    Missregistration between fist and second printing station.

    Is your paper flat? Are there any indications of the paper being wavy or tight edge due to moisture content or relative humidity (HR)? Also, is the paper grain long and not short? Steve Suffoletto
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    Ctp plate curves for screens

    Additional follow-up: The TVI will be dependent on Solid Ink Density (SID), more ink, larger dot (mechanical/physical) Also, screen ruling frequency or lpi, finer lpi, more TVI (optical)
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    Ctp plate curves for screens

    You said "A dot gain of 15 on a 50 is pretty extreme."? Actually , it sounds just about right if it's on a gloss coated paper. ISO 12647-2:2015 states a Tone Value Increase (TVI) of 16% for gloss coated paper. This uses conventional Murray-Davies (N=1) formula. You mentioned a business form, so...
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    Where do colours start and end?

    UNOFFICAL Hue Angle - Color 345-41 Red 41-85 Orange 85-100 Yellow 100-205 Green 205-300 Blue 300-310 Violet 310-345 Purple Source: Michael Pedersen in Copenhagen 2019
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    Where do colours start and end?

    and by the way, Pantone Orange 021 has a hue angle h'= 52'.
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    Where do colours start and end?

    After some further thaught, the hue angle range for orange may be more limited, 45'-65'
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    Where do colours start and end?

    The "science/math" is to use either the CIE hue angle (h') or the wavelength in nanometers (nm). The bigger issue is the subjective/personal definition of "orange." I would fan out the Pantone book and "find" your range of orange colors, then measure the start/first and end/last to get h' and...
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    IML Printing on Conventional Sheetfed Offset

    The dot gain (tone value increase TVI) is a simple fix with a CtP cut-back compensation curve. Returning back to the original problem of ink not drying, do you have an Ink Film Thickness gauge to test IFT on metal oscillator roller? You mentioned a water based "varnish". Is it really a...
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    How to use Fogra Media Wedge 3.0

    Yes. The Fogra Media Wedge just contains known screen tint percentages. When comparing to some target aim, you need the Lab values for that CRPC (Characterized Reference Printing Condition), Fogra 39 is for gloss coated paper (type 1&2), Fogra 47 is for Uncoated paper (type 4). Steve Suffoletto

e-Book: Steps to a More Profitable Workflow

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