Dr. Roisum. Do you have a video with illustrations on paper defects? Along the lines of alum spots, entrained air bubbles, poly, lignen spots, uncooked wood chips or pulp mill problems that show up in the sheet, picking problems, build up on head boxes that fall onto the sheet, water droplets, oil spots, etc...
I am a web handler, not a paper expert (even though I've worked in the industry for 45 years). The best source for paper defects is The Ultimate Roll and Web Defect Troubleshooting Guide, TAPPI PRESS, 2013. It has some 500 defects listed, including a whole chapter devoted to paper.
Dr. Roisum. Do you have a video pertaining to paper machine refining, additives corelating to size for the paper web to be run on the machine before the winder. where the fibers formation is so tight that it causes bouncing at the winder on those certain paper grades?
Good question Michelle. There is very little published work on winder vibration, much less the paper additives to moderate such behavior. However, I can say that just a couple of pounds per ton of friction modifiers, say soapy additives, can tame a tiger. Some kraft paper mills must use these additives solely to make the paper windable (DFM). I wrote a couple of papers on the mechanics of winder vibration years ago, but your question was not one of machinery, but rather of paper. A very astute query as even the best winder design and maintenance will not tame wild beasts of paper grades with high COF's.
Dr. Roisum. Do you have a video with illustrations on paper defects? Along the lines of alum spots, entrained air bubbles, poly, lignen spots, uncooked wood chips or pulp mill problems that show up in the sheet, picking problems, build up on head boxes that fall onto the sheet, water droplets, oil spots, etc...
I am a web handler, not a paper expert (even though I've worked in the industry for 45 years). The best source for paper defects is The Ultimate Roll and Web Defect Troubleshooting Guide, TAPPI PRESS, 2013. It has some 500 defects listed, including a whole chapter devoted to paper.
Dr. Roisum. Do you have a video pertaining to paper machine refining, additives corelating to size for the paper web to be run on the machine before the winder. where the fibers formation is so tight that it causes bouncing at the winder on those certain paper grades?
Good question Michelle. There is very little published work on winder vibration, much less the paper additives to moderate such behavior. However, I can say that just a couple of pounds per ton of friction modifiers, say soapy additives, can tame a tiger. Some kraft paper mills must use these additives solely to make the paper windable (DFM). I wrote a couple of papers on the mechanics of winder vibration years ago, but your question was not one of machinery, but rather of paper. A very astute query as even the best winder design and maintenance will not tame wild beasts of paper grades with high COF's.