Printing 4 color on 2 color machine.. need help.

Discussion in '1-Color and 2-Color Offset Presses' started by coricdado, Oct 29, 2019.

  1. coricdado

    coricdado Senior Member

    Joined:
    May 2013
    Messages:
    75
    Location:
    jadranaska tiskara senj, croatia
    Hello guys..
    Im new in classic offset printing. i have 2 color KBA Rapida and i need to switch to this machine.. i know how everything work.. but.. i have problem with color density.. i have experience working on 4color watherless machine.. heid. di.. but it hard to get real color on 2color machine..
    because i dont know how need to look first two color.. i dont have densitometer.. but even if i have.. i dont know will be usefull because i work with small number of copy.. 300, 500.. rarely 1000 (i know you will tell me now that these are not offset quantities... but...)
    how to get good color on finish with 2color machine?

    any help?

    thx a lot.
     
  2. NotAGooner

    NotAGooner Senior Member

    Joined:
    Dec 2007
    Messages:
    262
    Location:
    UK
    You should at least get a densitometer and maybe a Matchprint proof.
     
  3. jwheeler

    jwheeler Member

    Joined:
    Apr 2019
    Messages:
    48
    Location:
    CA
    You are going to waste alot of money on setup sheets, time and plates if you're regularly running these quantities in 4C on a 2C press. I'd highly recommend looking into a low-end digital press from Xerox, Canon, Ricoh or Konica Minolta. You can lease a decent one for around $400-500/month on a 60mo lease (and this will include a densitometer which you need either way). This will allow your to produce your jobs faster also save on the costs of your washup chemicals, blankets, towels, etc.

    Alternatively, you can start with outsourcing to trade printers like 4Over, GotPrint, or someone local. You're going to lose money doing 300-500 offset.
     
  4. mantman

    mantman Senior Member

    Joined:
    Nov 2015
    Messages:
    165
    Location:
    Greece
    Try to use a colorbar whenever possible and use your PMS book swatches of CMYK that should get you as fast as you can. Also see if you can buy a ink preseting program like presspercent. Please PM me to ask you about waterless printing
     
    mz000 likes this.
  5. Travis Young

    Travis Young Member

    Joined:
    Oct 2019
    Messages:
    53
    Location:
    Victoria Australia
    I'll second that. Color bars across the bottom of the sheet and a pms book.
    Conventional press, conventional technique.
    Might pay to run a test plate with some 25, 50 and 75% screens and simply adjust your image setter to 'close enough by eye'
    I always find it easier to achieve both colour and fit if I print 1 up wherever possible, especially for short runs.
     
    mz000 likes this.
  6. Travis Young

    Travis Young Member

    Joined:
    Oct 2019
    Messages:
    53
    Location:
    Victoria Australia
    Keep all your spoils and use them to settle down the colour on the next job. That's a big help as well.
     
  7. Warren Peace

    Warren Peace Member

    Joined:
    Feb 2019
    Messages:
    25
    Location:
    Houston, TX
    Is your water level high? Sometimes (especially with high gloss paper) water will stay on the paper and cause the second unit to wash out. When I print 4 color process on my 2 color I always run the darker color on the first unit and monitor the water closely.
     
  8. turbotom1052

    turbotom1052 Senior Member

    Joined:
    Oct 2008
    Messages:
    808
    Location:
    Vermont
    Don't know if its still available but you used to be able to image what was called a color key. Color key was a 3M product and the preferred method for printing multiple pass 4 color process. Each individual color was imaged onto a sheet of thin acetate in the required color. Each color was created on the color key with the appropriate color created from dyes. Each of the four sheets of acetate were registered together to create a full 4 color image. All you would need to do is take a sheet of the stock your printing, and place it behind the color or colors you want to visually separate. This allows you to get a progressive view of the job as its happening.
     

  9. mantman

    mantman Senior Member

    Joined:
    Nov 2015
    Messages:
    165
    Location:
    Greece
    Blast from the past Tom!
     
Loading...