About Us

info_center_Content_259x194.jpg

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.

  • PRE- PRINTING

    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.

  • PRINTING 

    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.

  • FINISHING & CONVERTING

    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.

  • STORAGE 

    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.