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.

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

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.

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

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

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

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

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

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.

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

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