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Home February 09, 2010

Surface Prep
Carton/Box
- Folding / Gluing
- Sheeting
Coat/Laminate
Controls
Web Handling
Slit
- Knives
Print
- Inks
- Prepress
- Digital
- Flexography
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Flexpack
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Label/Tape
- RFID
Bag/Pouch
Die-Cut

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Foray to the Future
Marsh Labels Goes Digital
Proteus Adds Heidelberg VLF
Folder/Gluer Is Modular

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Difficult Winding: Part II

Published Friday, September 01, 2006

Last month I introduced you to roll modulus ratio, the first of the terrible trifecta of difficult winding. This month let's move on to the next two of winding's troublesome trio: roll buildup ratio and coefficient of friction (COF). A roll's buildup ratio is simply its final diameter divided by the core's outer diameter; the trouble starts when buildup ratios go beyond three or four. Customers and accountants love larger buildup ratios, since larger buildups mean longer time between splices, lower core costs, and denser packaging. Be cautious of these apparent savings opportunities. If larger buildup ratios create ...

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