Paper and Print Technology

Paper and Print Technology

  • Aleksei Guzev added an answer:
    How do print machine engineers control the color when they make a printing device?
    Even though we do a good color management for a printing device with a certain kind of paper, for some in-gamut color, the delta E is still bigger than expected. Could anyone tell me how the engineers control the color in a new printing device and what lead to this result?
    Aleksei Guzev · Xerox Corporation

    There is a lot of tools engineers use. What do You mean by "delta E"? Was it difference between print and original? Maybe it was the difference between prints of different machines of the same model?

  • Aleksei Guzev added an answer:
    Whats the best way to prepare RGB files for CMYK printouts?
    I need to prepare colour tiles (approx 3*3mm with a uniform color) that were stored in sRGB color space for printing out on a litho printing machine (CMYK U.S. Web Coated (SWOP) v2).

    However, when I use the seperate+ plugin for GIMP to change to CMYK, the output changes the colors sometimes dramatically. I'm aware that the CMYK color space is more limited than the RGB space, but is there any way to keep the colors more consistent?
    Aleksei Guzev · Xerox Corporation

    Choose rendering intent wisely.

  • Humphrey Lumadede Mudoga added an answer:
    Can someone advise me on making slurry for manufacture paper from sawdust?

    I am try to do a laboratory scale manufacture from sawdust and I need to know the parameters and chemicals I should use and in what ratio? Does Sawdust loose its lignocellulossic structure and thus may need a strong binder for paper or soft tissue making? Please how does one make a slurry for paper manufacture using sawdust as the raw material? Humphrey

    Humphrey Lumadede Mudoga · Kenya Industrial Research and Development Institute

    Thank you for your anwers

    Humphrey

  • F. Louis Floyd added an answer:
    Could we correlate the rheological properties of a conducting ink with spreading and dry ink on substrates?

    I want to correlate the rheological properties of ink with spreading and drying behavior of ink on substrates. Please suggest any good references which explain the rheological properties with drying and spreading of ink on solid substrates.

    Any liquid containing magnetic or conductive pigments or fillers exhibits more complex rheology than liquids not containing such particles.  The attractive forces between such particles are considerably stronger than for non-magnetic and non-conductive particles, and usually exceed the repelling forces usually introduced by the addition of surfactants or dispersing agents. 

    These forces can be measured by

    • measuring viscosity as a function of shear rate, starting at zero rate.  The yield strength is the force required to see the first rotation of the spindle, and is quite sensitive to attractive forces between particles. 
    • In addition, any shear-thinning (pseudo-plasticity) will also reflect those forces. 
    • A third technique is to measure the viscosity response for the up-curve (increasing shear rate) with the reversed down-curve (decreasing shear rate).  The gap is called the hysteresis for the system, and is again sensitive to attractive forces.

    These three properties well-define the behavior of systems filled with particles that have attractive forces that tend to exceed the repelling forces usually introduced by the addition of surfactants or dispersing agents. 

    I hope this is some value to you.  The more specific you can phrase your questions, the better we all can respond to your interests.

    Lou Floyd

  • Saeideh Ghaffari asked a question:
    Do you know any evaporation retardant for PMA (2-methoxy-1-methylethyl acetate)?

    I use this solvent for printing ink. I want to retard vaporation of this solvent 

  • Hamed Haghi added an answer:
    What are your suggestions in designing a paper deinking flotation cell?
    I am working to gather information about different kinds of laboratory deinking flotation cell sand choosing one of them. Any experience in this respect is also welcomed.
    Hamed Haghi · University of Tehran

    Hello dear Mehdi;

    I have checked my database and maybe the enclosed 2 papers could be useful for you.

    Also please check the below link which it could be interesting:

    http://www.adirondackmachine.com/flotationcell.html

    Best regards,

    Hamed 

  • Manish Kashyap added an answer:
    I have an unread official document that is soaked in drainage water and diesel fuel. Can I regenerate the written letters without damaging the paper?
    It is written on cupboard paper.
    Manish Kashyap · ABV-Indian Institute of Information Technology and Management Gwalior

    Yes if You can still read them. Probably yes if u can read them with some difficulty.

  • Elizabeth Echevarria asked a question:
    What enzymes are good for wet-dry resistance performance in paper production?
    Paper mills, kraft pulp, paper products, we-resistance, dry-resistance paper.
  • Sartaj Ganie added an answer:
    What is the scientific method for paper dyeing, and at which stage is paper dyeing suitable?
    What is the scientific terminology for paper dyeing?
    Paper dyeing at pulp stage.
    Sartaj Ganie · Sher-e-Kashmir University of Agricultural Sciences and Technology
    Sir actually i am going to carry my research on application of natural dyes on(paper) non wood herbaceous plants like canabis, datura , amaranthus and other grasses species and for dyenig i will utilize natural dyes from prunus and caladulla
  • Gerd Meder asked a question:
    offset print problems
    I am interested in discussing offset print problems like vanishing dots and ghosting. Has anybody done some research why it happens and especially the chemical/physical reasons how the built up on blankets increases?

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Paper / Print Technology

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