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Hints  & Tips

Recently equipped with a digital press and looking for some printing advice?
This section is made for you.




  • SET -UP

    Use a paper cut to the exact format size rather than cutting from larger sheets

    - Prevent paper dusting due to poor cutting.
    - Make sure the sheet squareness is optimum to avoid short sheets or mis-registration causing machine shutting  off.

    Use long grain direction for paper weights and short grain for board weights

    - Follow the HP Indigo recommendations ; for dry toner, no consistent recommendations from press manufacturers.
    - Prevent jams and mis-registering due to fibre shrinkage after heat fusing of the toner.

    Select carefully the Gloss or Silk coated paper finish depending on the printing press

    - Avoid having too much difference in gloss between the printed image and the paper : most dry toner presses tend to give a matt effect to the image whereas HP Indigo presses give a more glossy effect.
    - Run a proof first if a job has never been printed digitally before.

    Ensure the paper has the adequate moisture level

    - Prevent curling effects and paper jams due to the sensitivity of the paper to the high temperature used for melting and fixing the toner to the paper (fusing).
    - Ensure an optimum electrical resistivity of the paper which is key for image transfer and toner adhesion.


    Always ensure that the right machine settings are used for the grammage of paper selected

    - Avoid a too high fusing temperature when printing low grammages as it could result in micro – blistering of the toner.
    - Avoid a too low fusing temperature when printing heavy grammages as it could result in poor toner fusion.
    - Check the press has adequate fusing capability or reduce machine speed (more speed = more heat) when using 350 gsm paper, as many dry toner machines have a limit of 300gsm.

    Use CMYK format images at between 300-600 dpi at the actual size of the printed job.

    - Avoid too low resolution of the printed images (like the web ones)
    - Convert RGB format files into CMYK.
    - Be sure to “profile” using the correct iso profile for the job and compare with a hardcopy proof.
    - Ensure 3mm bleed is supplied if you require the image to bleed of the edge.

    Ensure optimum  colour management

    - Many digital printing systems can handle up to 400% colour saturation.
    - Avoid tints below 10% as these will just look muddy.
    - For large black areas use a four colour black or “rich “ black, typically C40%, M20%,Y20%, K100%.  Do not use a single colour black for large solids.
    - For spot or metallic colours, use an HP Indigo digital printing system.


    Manage the long run-length jobs, particularly on HP Indigo

    - Avoid latent or hidden images , specifically on Heavyweight gloss papers.
    - Rather choose the silk grade or lower grammage if possible.
    - Make sure the blanket is in good condition before starting.
    - Stick strictly to the machine cleaning sheet frequency and do not reduce the number of cleaning sheets.
    - Avoid running too many impressions of the same image if a long run is required it is best to intersperse with short runs of a different image.


    Always use pre-scoring and do not fold across the grain direction, for folding sheets above 150 gsm  as with offset papers.

    - Avoid scuffing, scratches and cracking of the toner when folding.


    Re-wrap the remaining paper sheets once the ream is opened and store it in a well controlled climatic environment

    - Protect the paper from changes in temperature or humidity (storage away from open doors, windows or heaters).
    - Ensure the good runnability of the paper over the short-run jobs.