Switch to English Language Passer en langue franšaise Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 74,536   Posts: 1,646,104   Online: 857
      
Page 2 of 4 FirstFirst 1234 LastLast
Results 11 to 20 of 36
  1. #11
    jovo's Avatar
    Join Date
    Feb 2004
    Location
    Jacksonville, Florida
    Shooter
    Multi Format
    Posts
    4,103
    Images
    206
    Quote Originally Posted by Shawn Dougherty View Post
    ... and use a release paper over top. I have never experienced bubbling.
    Actually, I do that too except I use parchment paper (bakery section of the supermarket) that does the same thing but is far less expensive and is made for oven temps.
    John Voss

    My Blog

  2. #12
    Curt's Avatar
    Join Date
    Sep 2005
    Location
    Pacific Northwest
    Shooter
    Multi Format
    Posts
    4,551
    Images
    15
    Is it the Bogen 550 press? What pressure do you have the press set at and is the temperature you set really what you get? I've go the same press it sounds like and I once backed off on the pressure set to store and for a while when I moved. I later dry mounted a print and it looked fine but then at an angle it had spots that weren't pressed down, like bubbles. Check the mechanical setup and temperature control on the unit.

    Check out this article from J.B. HARLIN who has contributed here I believe, he is very sharp with photographic mechanics.

    http://www.jbhphoto.com/articles/dmadj/dmadj1.htm

    There are temperature strips that can be placed in the press but I haven't used them, maybe someone can give a source for them so you and the rest of us can do a checkup on our presses. Good luck and I hope your previous work is recoverable.

    Curt
    Everytime I find a film or paper that I like, they discontinue it. - Paul Strand - Aperture monograph on Strand

  3. #13
    Jon Shiu's Avatar
    Join Date
    Dec 2003
    Location
    Elk, California
    Shooter
    Plastic Cameras
    Posts
    2,687
    Images
    33
    I had a problem with my Bogen press due to only one side getting hot. Turns out the heating element had broken in two, so only one side was heating up. So check different areas of the press for temp.

    Jon
    Mendocino Coast Black and White Photography: www.jonshiu.com

  4. #14
    BetterSense's Avatar
    Join Date
    Aug 2008
    Location
    North Carolina
    Shooter
    35mm
    Posts
    2,977
    When I mount prints with a clothes iron, I use a good thermometer to measure the surface temperature of the iron. 180 degrees works, but not well. I use a temperature of 200-220 degrees. I'm sure there is some "temperature loss" at the tissue level.
    f/22 and be there.

  5. #15
    jovo's Avatar
    Join Date
    Feb 2004
    Location
    Jacksonville, Florida
    Shooter
    Multi Format
    Posts
    4,103
    Images
    206
    Quote Originally Posted by Curt View Post
    ...Is it the Bogen 550 press?
    It's the Bogen 560. I've just now put an oven thermometer probe in the press with three pieces of mount board on each side of the metal probe (a round rod) that equals the diameter of the probe, and keeps the top of the press level as well. The measured temp of the press was 205 f so I've backed it off a bit trying for about 190. I also use a piece of mount board on top of the pad to help with the pressure since I've not ever been able to really change it with the adjuster (I suppose it's an adjuster) on the top of the thing. I'm also pretty sure that the heating element is intact across the top of the unit. We'll see, now what happens.

    (btw, when I was using Colormount tissue, I used a pizza stone as a weight after pressing.)
    John Voss

    My Blog

  6. #16
    BetterSense's Avatar
    Join Date
    Aug 2008
    Location
    North Carolina
    Shooter
    35mm
    Posts
    2,977
    I've always wondered about using a pizza stone or piece of granite as a dry mount press. It seems ilke you could put it in the oven for a "long time" at 200F or whatever, and then just set it on your picture and leave it.
    f/22 and be there.

  7. #17

    Join Date
    Mar 2006
    Location
    San Francisco Bay Area
    Shooter
    Large Format
    Posts
    256
    My guess would be a combination of temperature, and pressure at the cooling stage of the process. I use the same tissue with my Seal Press set @ 225 degrees (nominal) with a two ply board over the print. Press for 1 1/2 minutes, and then comes what I consider the most crucial step, as the tissue adheres at the cooling stage. With a piece of two ply board over the print, I use a hard rubber roller and firmly roll over the print for at least 30 seconds, exerting pressure. I have never had the problem that you describe, although my prints are not subjected to severe climatic extremes. Hope this helps.

  8. #18
    jovo's Avatar
    Join Date
    Feb 2004
    Location
    Jacksonville, Florida
    Shooter
    Multi Format
    Posts
    4,103
    Images
    206
    Quote Originally Posted by Merg Ross View Post
    My guess would be a combination of temperature, and pressure at the cooling stage of the process. I use the same tissue with my Seal Press set @ 225 degrees (nominal) with a two ply board over the print. Press for 1 1/2 minutes, and then comes what I consider the most crucial step, as the tissue adheres at the cooling stage. With a piece of two ply board over the print, I use a hard rubber roller and firmly roll over the print for at least 30 seconds, exerting pressure. I have never had the problem that you describe, although my prints are not subjected to severe climatic extremes. Hope this helps.
    Thank you, Merg. Do you use BufferMount tissue? It's interesting that you are using a hotter press than I am...I guess I'll have to try both 190 (which I now have it set for) and your 225. The roller, and top 2 ply board sounds like yet another good idea to apply.

    Perhaps I need to add that the print usually looks great after it's come out of the press. It's only later that the bubbling either occurs or doesn't occur which suggests, as several of you have observed, that the tissue didn't adhere completely. Hmmmmm....
    John Voss

    My Blog

  9. #19
    Jon Shiu's Avatar
    Join Date
    Dec 2003
    Location
    Elk, California
    Shooter
    Plastic Cameras
    Posts
    2,687
    Images
    33
    Quote Originally Posted by jovo View Post
    It's the Bogen 560. I've just now put an oven thermometer probe in the press with three pieces of mount board on each side of the metal probe (a round rod) that equals the diameter of the probe, and keeps the top of the press level as well. The measured temp of the press was 205 f so I've backed it off a bit trying for about 190. I also use a piece of mount board on top of the pad to help with the pressure since I've not ever been able to really change it with the adjuster (I suppose it's an adjuster) on the top of the thing. I'm also pretty sure that the heating element is intact across the top of the unit. We'll see, now what happens.

    (btw, when I was using Colormount tissue, I used a pizza stone as a weight after pressing.)
    I think if you use mat boards on top of the print you need to press for a longer than normal time. I think the seal press comes with instructions with a chart for how much longer.

    Jon
    Mendocino Coast Black and White Photography: www.jonshiu.com

  10. #20
    jovo's Avatar
    Join Date
    Feb 2004
    Location
    Jacksonville, Florida
    Shooter
    Multi Format
    Posts
    4,103
    Images
    206
    Quote Originally Posted by Jon Shiu View Post
    I think if you use mat boards on top of the print you need to press for a longer than normal time. I think the seal press comes with instructions with a chart for how much longer.

    Jon
    John, you're right, but I was just trying to find a way to use the oven thermometer to measure, so the mat board scraps were beside the probe, not on top of it. It doubtless screwed up the pressure, but I was only trying to find the temperature.
    John Voss

    My Blog

Page 2 of 4 FirstFirst 1234 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  Ś   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin