Carbon less paper, printing problem

[Raman karthi]

Dear senior members,

I am facing the problem, that when I printing carbon less paper, (NCR), ink build up on the blanket too much,

And printing is not smooth, every 200 sheets have to clean the blanket.

What's reason to build up the ink on the blanket.?

Any help appreciated.

 

[turbotom1052]

Paper sizing

 

[Raman karthi]

Paper sizing

Dear sir

What you mean the paper sizing?

What is reason inking bulidup the blanket?

How to avoid?

 

[turbotom1052]

Paper sizing is a sort of coating that comes from the mill over the sheet. Not sure what they use on carbonless stock but on many uncoated sheets it's usually a calcium carbonate type of coating that is a pain in the *** to print with, when you're printing blankets build up with it. My best suggestion would be to NOT allow it to build up too much and when it's time to clean off use lots of water on a sponge or rag. If your press is equipped with automatic blanket washers then it would be advised to wash often!!!

 

[Raf77]

If you can use 1st unit for de dusting that would help you a lot. If not, you can run the stock though the machine with impression engaged (without printing), or with impression and damper only ( that will kinda seal your paper but you must use very little amount of damp) and then print the job as 2nd pass.
It's all depends of how big job is and how much time you have. Sometimes is better to stop every half of stack and clean the blankets with water miscible wash. You must find what's works best for you.

 

[Adil]

Hello, I already described this problem in another post.
it is a rise in thickness in the blanket cylinder and plate holder to avoid this problem it is necessary to reduce the ink tack, reduce the wetting at the limit of lubrication, improve the wetting values (ph, conductivity and ipa), change the quality of the support use a printing support with a better coating of paper or cardboard.

 

[Adil]

also a badly exposed plate, developed and gummed can give this problem, and finally in general it is necessary to reduce the temperature of the printing unit if the machine has a thermoregulation circuit and you must control the ambient temperature of workshop and keep it between 18° c and 22° c

 

[Gerald Reihl]

Not sure how long of run quantity you have before seeing this, but it's very common issue with this crude raw faced paper. Lower tack ink, and wetter, water via isopropyl or substitute of it helps as well. But, again yes, you'll be washing blanket often as it's the nature this beast.

 

[alibryan]

oops!

 

[Raf77]

Not paper sizing. The problem the OP is referring to regarding ink buildup is due to the carbonless paper coating coming off on the blanket (due to moisture) as it goes through the press. It covers the entire area that the sheet comes in contact with the blanket, and then that coating reacts with the plate surface and causes an overall tone, or ink buildup in that area.

Paper sizing is the edge (size) of the paper building up on the blanket (and impression cylinder), leaving a type of picture frame the same size as the sheet. If left for too long, it can cause deep impressions or eventual cuts in the blanket. Almost all paper types (coated and uncoated) will leave this over time, it’s just paper dust either from being cut before press, or in some cases it’s the mill edge that leaves it. Paper Sizing = Size of the Paper.

Some stocks leave more ‘sizing’ than others, depending on run length and quality of the stock.

I think he rather meant seizing

 

[alibryan]

I think he rather meant seizing

I think he was partially correct in what he said, and I was partially wrong.

Carbonless paper does have a unique coating (CF, CFB, CB) to cause image transfer when gathered in a set, and I had always assumed that that’s what sometimes builds up on blankets and can then cause excessive toning during printing.

It may or may not be the typical sizing he referred to that’s found in other papers.

Paper edge buildup on cylinders is sometimes called paper sizings, as well.

 

[Raf77]

I think he was partially correct in what he said, and I was partially wrong.

Carbonless paper does have a unique coating (CF, CFB, CB) to cause image transfer when gathered in a set, and I had always assumed that that’s what sometimes builds up on blankets and can then cause excessive toning during printing.

It may or may not be the typical sizing he referred to that’s found in other papers.

Paper edge buildup on cylinders is sometimes called paper sizings, as well.

I know exactly what you mean by sizing. I was about seizing - mean blanket is seized by paper coat. That's may be just misunderstanding cos English is not my first language. I may call it wrong but I'm sure you'll know what I mean.

 

[Jack liston]

Tom was correct sizing is a process of additives to the furnish or paper slurry and if not done correctly it will build on blankets also seen it come off in chunks.in this case it probably is the carbonless coat
Clean with water and press wash

 

[Bunkerintegrated]

Carbonless paper, also known as NCR (No Carbon Required) paper, is designed to make copies without the need for carbon paper. However, there may be printing problems specific to this type of paper. Here are common problems and solutions:

Blurred images or poor transmission:
Make sure to store carbon-free paper properly. Avoid exposure to heat, humidity, and direct sunlight as these may affect the chemical coating required for the transfer process.

Copy quality is inconsistent between games:
Verify that the printer settings (e.g. pressure, temperature, print speed) are appropriate for the carbon-free paper. Adjust the settings according to the specifications of the carbon-free paper used.

 

[Raf77]

Carbonless paper, also known as NCR (No Carbon Required) paper, is designed to make copies without the need for carbon paper. However, there may be printing problems specific to this type of paper. Here are common problems and solutions:

Blurred images or poor transmission:
Make sure to store carbon-free paper properly. Avoid exposure to heat, humidity, and direct sunlight as these may affect the chemical coating required for the transfer process.

Copy quality is inconsistent between games:
Verify that the printer settings (e.g. pressure, temperature, print speed) are appropriate for the carbon-free paper. Adjust the settings according to the specifications of the carbon-free paper used.

Did you re-type paper merchant leaflet?