Thread: picking question?

I still think it's more of a paper issue but just a further thought...are your blankets quick release in the sense of low inherent surface tack?

Lou and Richard are right on the money with the paper.....if Im working in a shop and I dont normally have an issue with piling Ill try a different stock during the m/r just to see if it goes away , if you absolutley have to run the paper then I see theres been several good replies with solutions to get the job done.....paper today is the worst Ive ever seen but this is what we are given to work with......

Steve

Cleaning the blankets and then applying a light coat of anti-skin spray to the picking area is a great fix for sheetfed presses. I was very suprised to read this about this trick in a thread because I was the only one that I know that had come up with this idea. Piling is usually the worst, first thing in the morning, especially on a Monday. And in my experience, only seems to happen on coverage like solid bars spaced out by 6-10" of non image area. I've actually yanked a job because of piling on a Monday morning and put it back on the press towards the end of my shift and had no problems. It's deffinatley enhanced by cold starts and a certain type of coverage. I used to spray my blankets with anti-skin after cleaning the areas that were piling and finished the job succesfully. And another good trick to work around the problem is to put a few hundred sheets of another "non piling" stock on top of your pile after you have achieved color and keep the press running. This allows the tack to release from your cold inks. On the other hand, I've worked around web presses that could not run certain rolls without piling period! Almost always a top grade dull text. I hate to reduce inks because I like to print a good dot. I think the problem is most certainly a paper coating issue but there are ways around it. After the press room heats up, your rollers heat up and your tack releases try putting the job back on the press. Also, watch your bearer pressure, this can be crucial with dull stocks. It's funny to me actually, the company orders a number 1 grade sheet and has more problems with it than a descent dull or enamel. I've never owned a Print Shop so I was never involved with the paper ordering but if I had been, I'd print a lot of jobs on a number 2 or 3 grade sheet with more absorption then aqueous coat it. I've heard so many excuses to the problem throughout the years but after acquiring a web in the shop, I was totally schooled again on the problem. Some papers just would not stop piling on them and as soon as they changed the roll, the problem went away. Now that's printing at 40,000 an hour. I implemented the ant-skin trick or a start up with another similar coated stock and was able to control the piling. I know one thing for sure, some stocks do it and some stocks don't. And, press temperature aggravates the problem. Being cold that is. Hope this helps and I have to say this is a great website and I'm sorry if I got started on the wrong foot with a few of you guys!

Good Post Loup - I agree 110%

Wow Thanks alot!

I had terrible problems with piling using 2sheet pulpboard (150g) on very long runs. switched sheet and the problems went away. there was a huge difference, the first lot i could be cleaning the impression cylinder every 3-4000 runs. now i dont even need to even on runs up to 60000

I rest my case...have a good weekend all

sometimes doing it on the cheap just isnt worth it.

we still have a few cans of a product called rycoline blanket hardener. its a banana oil extract that will remove the tack from the blanket. ive used it with success when faced with picking problems. theres also a product that goes with it to restore your blanket to pre hardened condition. its called blanket hardener remover. imagine that!!!! i dont know if the stuff is still available as im thinkin it has very high voc