How to avoid paper curling while drying?

Discussion in 'Silver Gelatin Based Emulsion Making & Coating' started by unrealalex, Nov 21, 2007.

  1. unrealalex

    unrealalex Member

    Messages:
    33
    Joined:
    Jan 26, 2006
    Location:
    Saint-Peters
    Shooter:
    Large Format
    Hi All,

    I make gelatin paper for process with bichromates: oilprint, resinotype, etc.
    I use 6% gelatin solution with some additions:
    100 ml 6% gelatin:
    - glycerin 4ml (acts as plasticizer)
    - 1% Salicylic acid alcohol solution - 2ml (acts as preserver and prevent bubbles formation)
    - Alum - 0.13g in 10ml of water (hardener)

    I coat paper in this way:
    - put paper in a tray of warm water for 2 minutes
    - squeeze on glass with rubber roller
    - remove excess water with paper towel
    - pour hot emulsion and spread it with glass tube or plastic comb.
    - wait 5 minutes for setting gelatin
    - put glass with paper in the refrigerator for 20 minutes
    - remove paper from glass and hang to dry

    But after 24h of drying I get curl and other paper distortion :sad:
    How can I avoid those distortion? What do you think?
     
  2. yashasvi bhuta

    yashasvi bhuta Member

    Messages:
    15
    Joined:
    Jan 7, 2014
    Location:
    india
    Shooter:
    35mm Pan
  3. Vaughn

    Vaughn Subscriber

    Messages:
    5,305
    Joined:
    Dec 13, 2006
    Location:
    Humboldt Co.
    Shooter:
    8x10 Format
    After rolling the wet paper on the glass, tape the paper to the glass all the way around it. Dry it on the glass.
     
  4. richard ide

    richard ide Member

    Messages:
    1,227
    Joined:
    Nov 8, 2005
    Location:
    Wellington C
    Shooter:
    Multi Format
    Once the paper has dried on glass, it will curl depending on the environmental humidity. Would it be possible to coat both sides by dipping the sheet and removing the excess with a couple of glass rods (or one; one pass for each side). With both sides coated, the sheet will be in equilibrium and curling would be minimal.