piling

Discussion in 'Web-Presses' started by pa printer, Jan 22, 2009.

Tags:
  1. pa printer

    pa printer Member

    Joined:
    Jan 2009
    Messages:
    9
    Location:
    pennsylvania
    I run a Solna heatset web, I recently started running a ground pulp offset paper, bsaically news print type paper. I am having severe piling on plate and blanket. I have tried more pressure and less pressure, new blankets and over and under packing of them.

    I run a onestep fountain solution which gives me a 4.0 ph, my inks are reduced to the point of just about scumming and cannot solve this. After about 5 - 8 thousand sigs problem is back. Where to start what to do???

    Any help from anyone please.
     
  2. dpearson

    dpearson Member

    Joined:
    Jan 2009
    Messages:
    11
    Location:
    Broadview, IL. U.S.A.
    its the paper, guaranteed. Just get in the habit of hitting those blankets at the start of it with plain water then blanket wash. You'll be looking like popeye pretty soon. I feel for you bub
     
  3. 6colorpressman

    6colorpressman Member

    Joined:
    Jan 2009
    Messages:
    21
    Location:
    Florida , USA
    yes , it is the paper . I used to run a 4 unit goss heatset...and on some papers I would have the same problems...nothing helped except washing the blankets often...i would let the press run and turn the counter off and wash the blankets while running...at a slower speed of course. good luck :D
     
  4. pa printer

    pa printer Member

    Joined:
    Jan 2009
    Messages:
    9
    Location:
    pennsylvania
    piling issue

    Yeah guys it was a paper issue. This is what I was thinking but until the paper rep showed up and grudgingly admitted he sold me crap I had to battle through.

    This was about the worst paper issue I have had in a looooong time, took me back 25 years or so. Thanks for the answers and helping out.
     
  5. veejay18

    veejay18 Member

    Joined:
    Dec 2008
    Messages:
    11
    Location:
    India
    How many units in your machine? if you have any spare unit you can use it as pre-dampening so that fluff will be eliminated so that you can prolong your run upto 20k otherwise try using IPA about 5% there should be some improvements.
     
  6. pa printer

    pa printer Member

    Joined:
    Jan 2009
    Messages:
    9
    Location:
    pennsylvania
    Yes Veejay I tried the open unit, but it just seemed to aggravate the surface more also used the alcohol. It was crap paper plain and simple....


    While I am, entering here, does anyone out there run a Solna heatset web 4/4.........a C 96 model around the late 1980's era?????
     
  7. Marcus

    Marcus New Member

    Joined:
    Feb 2009
    Messages:
    1
    Location:
    Sweden
    Yes, we are running a Solna C96 early 90s .
    In the northern of sweden.
     
  8. pa printer 3

    pa printer 3 Member

    Joined:
    Nov 2009
    Messages:
    20
    Location:
    pennsylvania
    Marcus get in touch with me I have some issues with our Solna and not to many people have them around here.Pleasr.
     
  9. nosefo

    nosefo Member

    Joined:
    Aug 2009
    Messages:
    23
    Location:
    Norway,Stavanger
    If you run with a low PH you will also increase the chance for piling "paper dust", this happens because the low PH will tear appart the paper "binding of fibers". Instead of running with that low PH, try to increase the IPA instead. I will recommend you to run with a PH 4,5 - 5,5. and IPA above 6% this works great on all paper types we use uncoated and coated.
     
  10. pa printer 3

    pa printer 3 Member

    Joined:
    Nov 2009
    Messages:
    20
    Location:
    pennsylvania
    OK thank you....as I said I run a onestep solution and it gives me 4.0 ph. To get a higher ph will probably have to change my solution( no big deal) probably run a two step or not buffered for a higher ph and start running alcohol. I do notice a " linting" on my blankets after running for awhile.
    On another note how do you pack your units, are they packed even through the press or do you pack progressive,meaning start first unit at say 80 and finishing on 4th unit at lets say 84 or 85.....I was told to do this by a press mechanic to help with register issues but have had no luck, it helped absolutely nothing.
     
  11. nosefo

    nosefo Member

    Joined:
    Aug 2009
    Messages:
    23
    Location:
    Norway,Stavanger
    Packing-increased diameter unit 1 to unit 4 (or 9 in our machine)

    I`m not sure how your machine is constructed. But in our machine the diameter on the printcylinders increase a little for each unit. We are talking about some 100 of a mm for each unit. Because of this we dont need to increase the packing for each unit. The reason the machine is built like this is more about getting the web tension between the units than the color register. Try to run the press with a higher web tension first of all. Maybe your load cells are not that correct anymore after some years in service, and you may have to compensate for this?

    Please tell me more about your problem around this issue. Are your color register constant out of register, or does it move in circumferential direction or lateral direction when the machine are under production.?

    ------------------------------------------------------------------------
    A tip about the packaging: If you are constantly running with a "base" in you packing you can make a fixed packing by using a self addisive cover foil and put this on the cylinder. Then you just need to fine adjust with a thin packing instead of multiple layers of paper.
    We are using a cover foil from 3M the thickness is 0,10mm on our plate cylinders. Because our printlenght were a little to long (0,5mm) over 61cm. The foil we use have 10 years warranty under normal use (witch is not guarantied on a print cylinder)
     

  12. pa printer 3

    pa printer 3 Member

    Joined:
    Nov 2009
    Messages:
    20
    Location:
    pennsylvania
    Ok nosefo email should be to you by now......thanks