Adast 313 Gear Streaks on Blanket

Discussion in '1-Color and 2-Color Offset Presses' started by demel, Jul 1, 2008.

  1. demel

    demel Senior Member

    Joined:
    Jun 2008
    Messages:
    64
    Location:
    Sri Lanka
    Could somebody help me to solve the Gear Streeks problem on Blanket.
    All form rollers and other rollers are recently replaced.
    I adjusted 3 form rollers to 2mm each on to the plate. but couldn't solve the
    problem.....removed blanket packing....but the problem still there.

    Any advice to overcome this.......

    Thanks in advance.
     
    Last edited: Jul 1, 2008
  2. somma

    somma Member

    Joined:
    Jun 2008
    Messages:
    32
    Location:
    merlo - san luis - argentina
    Hi,

    Sometimes this problems comes from the ink/dampening systems.
    If there are streeks on blanket, these must be firts at the plate.
    Check the move of oscillating rollers.
    Check the gears of oscillating rollers.
    Change the water of the dampening system.

    Good luck
     
  3. demel

    demel Senior Member

    Joined:
    Jun 2008
    Messages:
    64
    Location:
    Sri Lanka
    Dear Somma,

    Thank you so much for allocating your time to help me out.
    There is no streeks on the plate......no scumming.......plate is cleaning very well
    in the non image area........but the streeks coming in the whole blanket including non image areas......

    You gave me a good point......the movement of the oscillating rollers.....and gears......i'll check and let you know the progress.

    please let me know what do you mean by changing the dampening water system....

    Once again thank you so much for your reply Somma.
     
  4. somma

    somma Member

    Joined:
    Jun 2008
    Messages:
    32
    Location:
    merlo - san luis - argentina
    Dear Demel:

    If you have a mark of ink at the blanket in the non image area, this come from the non image area of the plate.
    May be you don´t see easy the streeks at the plate, but when you runnig a few sheet, this streeks will appear at the blanket.

    Does this happen with every colors? if not. change the colors and see what happen.

    About the water:
    Different type of solution water has a different reaction on the plate.
    Try to use other brand of PH regulation, may be you could use IPA (alcohol isopropilico), but with IPA you need to use a chiller for the water.

    regards
     
  5. demel

    demel Senior Member

    Joined:
    Jun 2008
    Messages:
    64
    Location:
    Sri Lanka
    Yes Dear Somma, it happens to every color we print.

    I checked the oscillating side of the machine.....it's oscillating smoothly
    and the gears are also in good condition....

    Re: water Dampening

    I think it's difficuilt for me to switch to IPA coz it requires chillers.

    How can i resolve this.......
    Does the rilsan roller to form roller pressure cause this problem.
    Could you explain me to check the ink strip method i should do to check
    that pressure in mm. Sorry for bothering you my dear....I am stuck.

    Thanks
     
  6. somma

    somma Member

    Joined:
    Jun 2008
    Messages:
    32
    Location:
    merlo - san luis - argentina
    Dear Demel:

    to Check the pressure roller you can do the next:

    Use a white or yellow color.

    For example to check the firts one form roller to rislan roller, run the machine witn ink for a few minutes. Stop the machine for 20 seconds and now move the machine enought for see the strip. It must be 4-3 mm along the all lenght of the roller. If it not correct you must adjuts.
    Do the same with all rollers, May be to see the second and thirth roller you need take off other flotation rollers.
    When you are finish check the pressure to form rollers with the plate.
    Is this machine new for you?
    When did the problem start?

    Regards
     
  7. demel

    demel Senior Member

    Joined:
    Jun 2008
    Messages:
    64
    Location:
    Sri Lanka
    Oh! what a reply.....it's worth a million to me my friend Somma.
    Actually this machine is bought recently.

    will give you an update about the progress....

    Thanks Buddy
     
  8. demel

    demel Senior Member

    Joined:
    Jun 2008
    Messages:
    64
    Location:
    Sri Lanka
    Dear Somma,

    Sorry for troubling you......
    one more thing before i start to adjust.....

    Please advice me how to check the Blanket to plate strip.
    can the above method applicable to check the this thing also.
    or is there any easy method than the above coz the immpression cut of
    without a paper.....


    and finally what is the thickness of the strip ( ? mm) you would recommend
    for Blanket to plate i should keep.

    Thanks
     
  9. somma

    somma Member

    Joined:
    Jun 2008
    Messages:
    32
    Location:
    merlo - san luis - argentina
    Demel:

    I think that your machine is bear to bear, that is mind that the blanket cylinder and plate cylinder have a circular steel plate on both side of the cylinder (10 - 15 mm).
    When the machine is with pressure on this circular plate must be in contact.
    Find around of your machine a information plate where you can find how much is the high of the blanket and plate measured to the bear.
    If you check these things and they are OK the pressure are fine.

    At some machines you have a eccentric bearing on both side to the plate cylinder to correct the pressure. You must be careful to adjust it Before you change this adjust make a mark with a pin.

    If the problem keep going, speak to the person that you bought the machine.

    Don´t hesitate if you have more question.
     
    Last edited: Jul 3, 2008
  10. demel

    demel Senior Member

    Joined:
    Jun 2008
    Messages:
    64
    Location:
    Sri Lanka
    Hi I am back dear Somma,

    You are correct my machine is just like a A3 size Rotaprint...
    not a bear to bear......have to adjust blanket to plate pressue using the eccentric as you mentioned.........

    But, Sorry to say that after playing with all the rilsan to form rollar pressure and blanket to plate i couldn't come up......finally i cut off two form rollers to plate out of 3 form rollers.....but the problem still exsist dear.......

    I attached a photo of what i am refering to......

    Please look at the non image areas carefully.....
    How can i overcome this issue..........pleeaaassee Help.....

    Thanks
     
    Last edited: Jan 10, 2009
  11. demel

    demel Senior Member

    Joined:
    Jun 2008
    Messages:
    64
    Location:
    Sri Lanka
    When I checked the Blanket to Plate pressure it was about 5mm strip.
     
    Last edited: Jul 5, 2008
  12. somma

    somma Member

    Joined:
    Jun 2008
    Messages:
    32
    Location:
    merlo - san luis - argentina
    Dear Demel:

    I still think that this problem came from ink system.
    Try to do this:
    Uncouple all the system that moves the oscilating roller.
    Be sure that all ink rollers have the right diameter.
    when you change the pressure of some ink roller to rislan rolles Ckeck if change the distance between the center of some gear of the ink system.
    If yours machine has a plastic gear, or something like that, check that this gear is in good condition.
    First if you machine has it, take off the plastic gear of the ink system.

    Please update me.

    Regards
     
  13. demel

    demel Senior Member

    Joined:
    Jun 2008
    Messages:
    64
    Location:
    Sri Lanka
    First of all I must thank colorprintingforum for doing this
    great thing.......if not how can i find a person like you Somma....
    Somma you are also doing a great job dear.....I think you're
    one of the oxygen providers to this forum.......


    Dear Somma,

    Thanks for the quick reply,

    But before I go to that step Shall we check our machines dampening system
    as you said earlier.....I have one thing to clear off of the dampening side.....
    could you explain about the chrome rollers duty....in my machine two form dampeners forced to the plate by a one chrome roller......So, what is the duty of this chrome roller hear.....i have a doubt about it behavior.....
    is it necessary to catch or stick the ink to this chrome roller while the machine on the run......If yes that's the problem i doubt.
    my one is not getting any ink while on the run......what do you think about this thing....????
     
  14. demel

    demel Senior Member

    Joined:
    Jun 2008
    Messages:
    64
    Location:
    Sri Lanka
    Yes there are plastic rollers attached to the oscillating rollers......
    what is the best simple method to check whether it's worn off.....???
     
  15. somma

    somma Member

    Joined:
    Jun 2008
    Messages:
    32
    Location:
    merlo - san luis - argentina
    Demel:

    The chrome rollers must be clean every time, you can clean this roller with plate clean.

    About oscillating Rollers:
    Please answers this question: when you are change the pressure over oscillating rollers. Are there movement of the gear´s oscillating rollers?

    Could you tell me how I do to insert images?
    Regards
     
  16. demel

    demel Senior Member

    Joined:
    Jun 2008
    Messages:
    64
    Location:
    Sri Lanka
    Then it seems my dampening part is working properly.....

    About Oscillating Rollers:
    I'll re check and give you an update.....

    To attach an image:
    There is a Go Advanced button in the Quick Reply section. Click on that Advance button and scroll down a little bit to locate the Additional Options.
    There you can find Attach Files sub section there. Just click on the the Manage Attachments and Brows your Hard Disk to locate the image or file you want to upload and press the upload button there........

    Thanks
     
  17. somma

    somma Member

    Joined:
    Jun 2008
    Messages:
    32
    Location:
    merlo - san luis - argentina
    Dear Demel:

    Hi,

    You can see in the picture attached the distance called JR, if this distance is too short the gears don´t have a smoothly movement, that is the reason because I have been asked about the gears.
    Now if you have needed move too much the rislan roller to get the right pressure may you are having this issue, called interference.

    Regards.
    Miguel
     

    Attached Files:

  18. demel

    demel Senior Member

    Joined:
    Jun 2008
    Messages:
    64
    Location:
    Sri Lanka
    Hi dear Miguel,

    Sorry for being late to reply.......i was struggling the whole day
    to sort out this issue......i checked all the oscillator rollers.....didn't find
    or notice any major errors in JR distance as you described in your previous mail..
    I have attached some photos for your reference.....only a slight tightness
    experienced in the big oscillator wheel......but i think that doesn't influence
    that much to the print quality.......

    Still i am using the Blanket which comes with the machine when i bought.
    is it possible to create this type of streeks due to blanket's fault....Still i couldn't
    replace it with a new one......what do you think Miguel.....????

    Thanks
    de Mel
     
    Last edited: Jan 10, 2009
  19. demel

    demel Senior Member

    Joined:
    Jun 2008
    Messages:
    64
    Location:
    Sri Lanka
    Dear Miguel,

    I forgot to mention one thing.....There is no movement of the oscillator
    gears when i try to set the pressure in between rilsan roller and from rollers...

    Thanks
     

  20. somma

    somma Member

    Joined:
    Jun 2008
    Messages:
    32
    Location:
    merlo - san luis - argentina
    Dear Demel:

    try to do the next, put off the nylon gear in contact with the master metal gear that move the oscillating roller to the ink system, the rollers could stop when are over the gap of the plate cylinder, but this is only to check. Run a few sheet and see what happen.

    Regards
     
Loading...