Paper and Print Technology

Paper and Print Technology

  • Ivan Deviatkin added an answer:
    Where can i find the details regarding manufacturing paper from elephant or camel excreta/ feces?

    amount of feces required+other ingredients required

    Ivan Deviatkin

    I am affraid, you need to be a trailblazer regarding that production process and have outstanding marketing skills to effectively sell the "paper", which you might produce. Good luck with this research!

  • Harnois Maxime added an answer:
    Can HP deskjet inkjet printer 1010 be used for printing CNT films on plastic substartes?

    I would like to use HP Deskjet Inkjet printer 1010 for printing CNT films on plastic substrates. If anyone had similar experience and request you to advise me.

    Harnois Maxime

    Have you succeed?

  • Claudio Acuna 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.
    Claudio Acuna

    One of the simplest equipment to implement are column flotations

    (porous sparger)

    for example (forget about the aerosol, that was a different test)

    • Source
      [Show abstract] [Hide abstract] ABSTRACT: Aerosol-enhanced flotation deinking of recycled paper Silicone oil offers an effective way of forming a layer on the bubble surface TEXT SIZE bigger text smaller text By: C.O Gomez, C. Acuña, J.A. Finch and R. Pelton 2001-10-02 Flotation has been used in the mining industry for more than a century to separate minerals. This process is based on the collection and removal of hydrophobic particles by rising air bubbles. If the hydrophobicity of the mineral is not natural, this condition may be achieved with the help of added chemicals. In wastepaper deinking, the pulp includes naturally hydrophobic ink particles and hydrophilic pulp fibres and minerals (fillers), and flotation offers an effective means of separation. Although the concept of flotation for wastepaper deinking was developed in the 1930s, major innovations in flotation technology specifically for the pulp and paper industry have come about only in the last 20 years [1]. Today, flotation is recognized as the process of choice for removing ink from re-pulped paper. There are three consecutive stages in flotation: particle-bubble collision, attachment of hydrophobic particles to the bubble during collision, and transport of the bubble-particle aggregate to the froth product. As in any process involving consecutive stages, the process efficiency is a direct function of the individual stage efficiencies, which are greatly dependent on bubble and particle size. Flotation machines generate bubbles and create hydrodynamics favouring bubble-particle collision while, at the same time, minimizing detachment during transport of the bubble-particle aggregate. Attachment, which mainly depends on the surface properties of particle and bubble, is less affected by hydrodynamic conditions. Particle collection in flotation has been extensively studied. Examples of approaches used to model the processes involved include Weber and Paddock [2] and Schulze [3]. Particles approaching a bubble follow fluid-stream lines around the bubble. Gravity and inertia forces move the particle towards the surface of the bubble. A particle will attach to the bubble when the liquid film between the particle and the bubble thins and ruptures forming a three phase (solid/liquid/air) contact line. A new concept to facilitate particle attachment has been devised and tested based on coating bubbles with a layer of an insoluble hydrophobic oil [4]. If it is easier for the particle to break the liquid film on a bubble covered by an oil layer than on a clean bubble, then the ink flotation rate will be increased. The testing of this concept required a method for coating bubbles with insoluble oil. It was demonstrated that it is possible to form bubbles covered with a layer of an insoluble liquid (silicone oil) by dispersing air containing small droplets of the liquid (aerosol) [4]. Moreover, coated bubbles showed an increased deinking ability when used on a model deinking system consisting of carbon black particles dispersed in water. The term aerosol-enhanced flotation refers to the use of this aerosol to form oil-coated bubbles. The objective of this work was to test aerosol-enhanced flotation in an industrial environment. The testing site was Bowater's Gatineau, QC, mill, where column flotation testing facilities have been installed and continuously used for several years
      Full-text · Article · Oct 2001 · Pulp and Paper Canada -Ontario-
  • Jules Lloyd Hammond added an answer:
    What companies can print photomasks to be used with a mask aligner in US?

    Hello, I just have a new UV lamp and trying to make some soft-lithography. However, I don't know which companies are printing photomasks in US. I wonder if somebody can give me some contacts? The best is from North East area. Thank you. 

    Jules Lloyd Hammond

    Further to Jose's suggestion of photofilms,

    I have successfully used 'hi-res' film masks from Micro Lithography Services Ltd. (link below) for processes that have much larger features. They offer a fast service at very affordable prices.

    We successfully managed to create 10 um interdigitated electrodes using these films. I did also test a 5 um pattern, but personally I felt that with the long features the edge quality started to deteriorate.

  • Zhanhao Hu added an answer:
    How can I make the polyimide banks more hydrophobic/oleophobic on the pixel substrate?

    I am doing the research about printing OLED. The substrate is pixel-structured where polyimide is etched out to defined the RGB printing areas. Polyimide is not hydrophobic/oleophobic enough, and when ink-jet printing, if droplet is too large or the position is a bit drifted from the pixel pit, the doplet targeted for one pixel will have a chance to flow into the other nearby. I've heard that some people use some surface energy patterning treatment to make the pixel wall (i.e. polyimide) more hydrophobic/oleophobic while not disturbing the pixel pit (i.e. substrate electrode). How do they do this?

    Zhanhao Hu

    Yes, I've read some of their works. They spin-coat some hydrophobic molecule and uses photolithography to etch out the patterns. However my  pixel substrate is already a pattern composed of hydrophobic polyimide (PI) and hydrophilic ITO surface (the area where PI is etched). Actually, it is a substrate that you use to fabricate OLED display where the etched areas define the RGB pixels. My intention is to further increase the hydrophobicity of the PI banks. So I don't think Sirringhaus's methods is useful here since one more etching for eliminating the coated molecules in the pixel areas is not feasible.

  • Mustafa Çiçekler 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

    Mustafa Çiçekler

    Thanks for your informations Dear Robert

  • Mustafa Çiçekler added an answer:
    I need a dirt particle analyzer for deinked pulps. Is there anyone who can help me?

    I need a dirt particle analyzer software for deinked pulps? Is there anyone who can help me?

    Or how can i supply software? 

    Mustafa Çiçekler

    Dear Tarık,

    Thank you for this. I sent en email to you.

  • Mohammad Mohkami added an answer:
    Which enzyme gives the best result in deinking?

    My work is about deinking and I will use enzyme before deinking process. Which enzyme does give the best result in deinking? I am waiting for your suggestion.

    Mohammad Mohkami

    Dear Mustafa, yes You said correctly. Both of them are correct. However, I think  U/g is better. If you can find amount of U/g pulp.

    The enzyme unit (U) is a unit for the amount of a particular enzyme.

  • Emrah PEŞMAN added an answer:
    What is the average ERIC (effective residual ink concentration) of waste office paper?

    What is the average ERIC (effective residual ink con.) of the waste office paper 

    Emrah PEŞMAN

    Because of large and heterogeneous dispersed specks, speck analysis is more suitable than ERIC (effective residual ink concentration) for determination of ink removal efficiency of recycled office paper . ERIC measurment is more suitable for ONP-OMG

  • 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

    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

    Choose rendering intent wisely.

  • Harnois Maxime 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.

    Harnois Maxime

    Rheological properties strongly impact on the ink drying. Drying mechanism is complex (e.g., coffee ring...) but can be controled.

    You will find interesting information on the following paper about rheological ink parameter and drying behavior of droplet but also on thin film drying. It deals with polymeric based ink but I think this study could be usefull to understand and describe drying behavior of nanoparticules based ink

    If you have any questions feel free to contact me!

  • Zol Bahri Razali added an answer:
    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 

  • Closed account 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.

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

  • Umer Asgher added an answer:
    Can someone suggest a variable burn-rate paper formulation meaning a paper formulation that allows the control of paper combustion rates?
    The combustion rate of paper is influenced by its structure and formulation, and modulating such properties should enable a way to control the rate at which combustion takes place under varying conditions. I wish to explore novel formulations or structures that would allow to significantly reduce paper combustion rates.
    Umer Asgher
    Thank you Dr. Nizar Matar
  • 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
    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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