Investigating the Technology Behind ‘Crack-free’ Paperboard
A lot of great things arrive at my doorstep these days. A few weeks ago, I got a great sample package from Iggesund Paperboard regarding their Invercote line of premium paperboard. They sent me some really gorgeous packaging samples — you know, the kind you’d want to save because they are too cool to throw away — and a note that said their paperboard will not crack at the fold with or against the grain, on even their heaviest 144-lb cover.
Well, that’s a pretty hefty claim, so I had to investigate. Obviously, there must be some technology behind this paperboard, and since this is a finishing technology blog, I think it’s fair game.
I contacted Neal Haussel, sales manager, Graphics USA for Iggesund Paperboard, to ask for some inside scoop on the technology of their paperboard performance and here’s what he said:
“We make a 3-ply product on a state-of-the art triple wire machine. The wet end of the machine was completely replaced in October 2007. This is the primary technology that allows for crack-free scores and folds with or against the grain, and even diagonal to the grain (see photo). The machine is fed by three separate head boxes which allows us to vary the fiber composition for each of the three layers.
“We use fully bleached fiber throughout (no mechanical fiber), but vary the percentages of long vs. short fiber. The outer layers (print surfaces) contain a higher percentage of short fiber providing a smooth surface for exceptional print reproduction. In the center ply we use a higher percentage of long fiber which provides the strength, durability, stiffness and yield advantages of an SBS (solid bleached sulfate) board grade. So, Invercote offers the characteristics of a board grade, but the print surface of a premium coated cover. As you might imagine, we are very well suited to high end cosmetic and pharmaceutical packaging, as well as high-quality brochures, book covers, and more.”
Trish Witkowski is Chief Folding Fanatic at the online community foldfactory.com. She holds a bachelor of fine arts degree in graphic design and a master of science degree in Graphic Arts Publishing from Rochester Institute of Technology's School of Printing Management and Sciences (now the School of Print Media).
An award-winning designer, Trish held the position of creative director for a Baltimore-based agency for six years, and has taught design and desktop publishing at the college level. She has a specialized expertise in the area of folding and is the creator of the FOLDRite™ system, a 2004 GATF InterTech™ Technology Award winner.
Trish frequently publishes articles for graphic arts industry publications, and has written three books on the topic of folding: A Field Guide to Folding, Folding for the Graphic Arts: A Teacher's Handbook, and FOLD: The Professional's Guide to Folding.