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Should also be noted that in addition to running the correct, and clean press chemistry, it is also of importance that the plate processor is set up and maintained properly. Ive seen the very problem you described traced back to a failure to keep pate processors clean, and replenished as per...

How many times ive seen consultants come in and make recommendations that a companies existing employees have been recommending for years. Upper managements inability to change is usually the cause. Its either perceived as too costly, or too time consuming. So much easier to point accusatory...

As far as dusting the sheet either before or during printing, i will say this.... Ive seen it greatly improve paper debris problems, and Ive also seen it do more harm, as a result of loosening up particles. Sizing of the paper can have the same effect. If you must size the sheet it is my...

have you considered installing permapaks on all of your plate cylinders?

The defects, as mentioned, could come from many possible places. The most likely would be from the stock. Did you spec a particular stock, and if so was it a premium branded sheet? Did your printer say or imply that they would provide the paper, and that it would be of a known quality? Was...

Most modern fountain solutions have an algicide mixed into their formula. If its not enough, you might ask the manufacturer to either mix you a special batch with more in it, or get suggestions from them as to what to use.

can you hear any air leaks from the various pneumatic pistons, both in the on and off positions?

What gripper pads are we talking about? Infeed, impression, transfer, or delivery? Are the pads glued from the factory?

Along the same lines, the press manufacturers like to brag on how quick their makeready times are. What they don't tell you, when they demo that new press, with the big stopwatch on the delivery, is that the plates are of a known quality, where all the images have been proven to come right up...

How fast the press cylinders will turn, and how many sheets per hour on average you can put on your floor, are often WAY different figures. It seems that the press manufactures will always quote the presses top running speeds. They will also falsely quote the quickest possible makeready...

try swinging your blanket around to see if its a blanket issue. If it prints better when you swing the blanket you needn't look any further.

isn't blocking nothing more than an extreme case of setoff? ive seen both happen while the pile is still on the delivery platform.

Have you never noticed how a pile pulled from the delivery, and sitting off to the side, will often rise in temperature in comparison to the freshly delivered pile? I believe that this temp rise has a pretty direct impact on gas ghosting as well as blocking. This is one of the reasons that on...

What is it that would have you thinking that load blocking is the only way an exothermic reaction manifests itself?

I believe this phenomenon to be the major cause of gas ghosting.

Some might think of it as a coated sheet just by virtue of its smooth surface. Regularly printed 300 line duotone, tritone, along with 4color black and white. Mostly limited edition prints and coffee table art books. I can assure you we encountered differences in surface textures which...

Why wouldn't anyone be printing fine line screenings on uncoated paper? We used to routinely print fine line duotones and tritones on uncoated sheets. Granted it was supercalendered sheets but last I checked a super calendared sheet was still considered uncoated.

After a bit of research on this technology you mention I read a paper that touted the benefits of this "twin forming" you speak of. They mention a couple of different benefits to include reducing the "two sidedness" as compared to the older technology which led to the wire vs felt I mentioned...

Alois, when did this twin forming technology make its way into widespread use, as ive been retired for the past 6 years and don't recall hearing of this back when I was still active in the industry?

There's no reason that with the right amount of fingerprinting, a compensation curve couldn't be established to provide a better match between the felt side and the wire side of the sheet. It may take a bit of a commitment of press time and materials, but if you find your press is varying that...