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Some good ideas above, I've done each before and they do work. These days, we generally don't have the excess time necessary to go through all these extra steps, and then get the press back to normal setup for the next normal job. Running yellow first and black last works well and is SOP in many...

Sorry then, Brer. You wrote "Only on light weight papers and stock running grain short." I took that to mean it only happened when the grain is short. My bad, I guess. I still feel comfortable with saying that fit problems will always improve if the stock is run grain-long as opposed to...

The cause of the problem is the short-grain. I don't know for sure if humidity can make the problem better or worse, but it wouldn't surprise me either way. Ordinarily, with "long-grain" stock (i.e., the grain direction is running across the press, side-to-side), the sheet flares out as it is...

About 15 years ago I was working for an employer who accused me of not matching a swatch as asked. I told him it matched fine at press time, but he didn't believe me...since he was looking at the swatch and a sample from the job in his office. I nervously suggested we go to my press and check it...

Just an opinion here. I've been running offset printing presses almost my entire adult life, about 30 years. The future of short run color work is digital. It took digital "presses" almost no time at all to grab a big chunk of the market and it's only going to get worse. If I owned a small...

Here's what we do... Here's what we do... ...just blame the press crew. Ink is always perfect; just ask your ink sales rep. I've heard it all from those guys. It's NEVER the ink. It's the fountain solution, or a dirty press, or poor ink/water balance, or a lousy pressman, or improper...

I take it you are aware that is almost 50 year-old information, a lot of which is based on 60 year-old research. Suffice it to say, a lot has changed since then. Still, it's useful information for someone trying to gain a basic understanding of the lithographic process. I'm not really sure if it...

The old printing adage is "eliminate the variables". You altered something and now are having problems. If everything but the fount is the same, and you now have a problem when you didn't before, you already know what the immediate cause is. Finding a workable solution shouldn't be very hard at...

You're lucky. Our shop is owned by a completely non-technical ex-salesman, who doesn't understand printing at all, only dollars. He decides what we're going to use based on price. He changes everything almost yearly, based on what price guarantees he can finagle out of our multiple suppliers. We...

The only reason I've ever had to run more powder is to prevent set-off or bricking of the stack, so I assume that is the reason you say you have to run more powder. But I'm also curious why this customer supplied stock doesn't stack well. Is it coated or uncoated? Is it static-y, wavy, or what...

reply to pxtim reply to pxtim Let me put it this way: I had completely forgotten about this problem, and I just run it the same way I always have, which is to set the clearance to spec for a 100lb sheet and then leave it there. Komori replaced the cam followers and the gripper pads way back...

some other options some other options If you've NOT been having drying problems lately, you can try reformulating your fountain solution mix and running even less water on the press. Typically, adding more concentrate to the mix will slightly increase the tendency to scum but reduce drying...

kaoticor, the problem with what you suggest is that if it ISN'T the coating, then they will receive new paper from the mill and could easily end up with the exact same problem, again. They need to first check what effect grain is having on this job, IMO, for all the reasons previously given. OF...

I'm sorry you feel that way Alois. But that doesn't change the fact that I presented a likely cause, explained it, and further gave a way to test it. Without seeing the sheet in front of me, I would STILL bet a day's pay it's wrong grain paper causing the problem, regardless of what your...

dleather, if both a coating problem and a grain problem are possible, then a test stock run through the press should have wrong grain as well, otherwise you haven't proven anything. If a test sheet with normal grain prints just fine, what fixed the problem? Was it better coating or correct...

(Sorry for the double post - most of the following is repeated in a different post below. My bad, thought I was editing, not posting a second reply) If you suspect a possible grain problem and use another sheet to confirm it, you had better make sure both grains are running the same way...

it's probably the grain; here's a test it's probably the grain; here's a test Not having a sample in front of me, my gut feeling is that it's NOT the coating on the sheet, even though the sales rep is telling you it may be (they all talk a good game, but most rarely know what they are talking...

We generally get 1000 sheets over the exact run size and are typically expected to deliver at least 500 of those as salable "overs" to the bindery. We get about 1000 additional sheets on runs over 50K, and they usually order us a total of 5000 extras for any runs over 100K. We typically don't...

Thanks for your input, Al. Yes, that photo shows the type of adjustment I'm talking about here, Alois. It obviously looks a little different but is clearly the same thing. Does ANYONE out there make regular adjustments to this sort of setting, perhaps daily or even more frequently than that?

Thanks for your input, Pete.