Ellis Paperbox added Eagle Systems' cold foil unit to a new Komori press, pleasing customers looking for shine at an affordable price.Read more
Fluid preparation and delivery may be ancillary to the coating process, but they are critical to the coating outcome.Read more
PFFC's "Static Beat" columnist Kelly Robinson is part of expanded "Ask the Experts" program. Kelly and "Coating Matters" columnist Mark Miller present at CEMA …Read more
News | New Products
Printing solution, which can be integrated inline with converting machines for disposable sanitary napkins, applies patterns on inside of napkin
The NEOS Series, which will be introduced at ICE Europe, is said to be powerful and intelligent and to operate at high speeds
StayClean packaging recognized by World Packaging Org.
Company says line now offers reduced temperature and pressure, a simplified process, and improved quality
Films feature a protective layer said to offer good resistance and feature a paper-like matte finish
Company acquires Canadian supplier of corrugated displays, as well as Tencorr Packaging, a Canadian corrugated sheet manufacturer
Conference, held in Sweden, reportedly offered a forum for shared perspectives on narrow web trends, challenges, and opportunities
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Visit Kelly on Static from Static control expert Dr. Kelly Robinson, president of Electrostatic Answers; Kelly has 27+ years of experience in problem-solving and consulting.
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Visit Mark's Coating Matters from fluid coating expert Mark D. Miller; Process improvement and project management for precision roll-to-roll coating applications.
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- August 10, 2012
WebHandlersQuiz 18 continues the Q&A format I began this past February with our quest to address fundamental questions concerning web handling. To see past Quiz questions and answers, visit: pffc-online.com/blog/walker.
So this blog posting continues to focus on the subject matter we began in July, which is Winding–If you wind a paper and a film product of equal thickness and roll geometry at the same combination of winding conditions (tension, nip, taper, speed), which will likely have higher internal roll pressures or greater tightness?
The mostly likely answer is the film product will wind a much tighter roll, especially if it is a lower modulus film, such as polyethylene or polypropylene.
Paper products tend to wind looser rolls since they have a high relative compressibility in the radial direction, and the web stretch (a.k.a. strain) in the paper layers can lose their tension from radial shifting or compressing of the roll’s core and inner layers.
Film products tend to wind tighter rolls since they have a low relative compressibility in the radial direction, and the web strain (especially in stretchy films) in the film will have minimal tension loss from radial shifting or compressing of the roll’s core and inner layers.
One exception might be high speed winding of a smoother film without control of the entrained air layer compared to a more porous paper. While paper can absorb an entrained air layer, films will capture the air between layers. Over time, the air can bleed out of a film roll, causing it to loosen and potentially giving rise to a looser condition than paper on the same winder.
More on this topic was covered in this archived Web Lines column: The Pressure of Winding Rolls, May 2006.
Stay tuned to this blog for more Q&A. My next Quiz will feature still another facet of Winding involving the advantages of using a nipped or gap-controlled roller ahead of winding.