PRIMIR study provides the latest word on ultraviolet and electron beam curing in printing.Read more
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
A WorldStar 2015 Packaging Award honors company for fold-over blister card aimed to maximize billboard space and minimize material usage
The 2nd edition of Cartons, Crates, and Corrugated Board includes expanded data on tests, designs, materials, and regulations
Line is said to offer high performance and long bath life plus many environmental benefits
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
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Most Recent Posts:
- October 08, 2013
A simple question with a not so simple answer. Let's start by narrowing down the culprits.
If the web moves off centerline, there are a limited number of reasons this happens.
1. Roller misalignment
2. Roller diameter variations
3. Web bagginess
4. Nip pressure variations
5. External forces
Mechanism #1, roller misalignment and the parallel entry rule (see in my next blog!) are extremely important concepts to understanding webs and web handling. The parallel entry rule describes what the ideal web will do between misaligned roller if there is sufficient traction to bend the web. Without sufficient traction, the web behavior on misaligned roller is less predictable.
Mechanisms #2 through #4 are all dependent on the parallel entry rule. Therefore, which way a diameter variation, baggy web, and uneven nip will shift a web is also a function of traction.
Mechanism #5 (or external forces) includes the sundry possible interactions of the web to elements of the outside world, whether solid, liquid, or gas, including interaction with people, equipment, attached parts, air flow, or coatings.
But what's this Parallel Entry Rule? Nothing but the most important rule in web handling, that's all! Tune in for more with my next blog post.