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Converting Rx for Bowed Rollers

(Web Lines)

October 30, 2005, ... (length, width, thickness, modulus, tension) will need more traction forces to redirect the web. The total web expansion will fall short of theoretical spreading if the traction forces are too low. Air ...

Concave Rollers Pros & Cons

(Magazine)

June 29, 2005, ... have increased strain and tension. The laterally different tensions induce a moment (or torque) on the web. The moment creates a slight inward bend in the web. The web’s bent shape conflicts with the parallel ...

Get Out of the Scroll Business

(Magazine)

February 27, 2005, ... The web’s outside will see increased tension. In many cases, the web springs back with no induced curl, but there are limits. The amount of stress change from forming a curve is directly proportional ...

Why Tension?

(Magazine)

January 30, 2005, Why is tensioning such a crucial first step? What are the benefits of a well-tensioned web? What is the right amount of tension for your product? Don’t slack off now...keep reading for these answers and ...

Web Tension 101

(Magazine)

November 29, 2004, Typically, tension is measured in PLI (pounds per linear inch) in the US. If you know PLI and you want to know total tension applied to the web, multiply PLI times the width of the material in inches. ...

Mechanics of Tension Control, Part II

(Archive)

November 29, 2004, For this basic tutorial in the mechanics of web tension control, tension is defined as the force applied to a continuous web of material in the machine direction. For this basic tutorial in the mechanics ...

10 Tips on Antiwrinkle Rollers

(Magazine)

September 29, 2004, ... for years, I'm still amazed to see it work and get a process back up and running. The biggest limitation of this trick is working with width changes. A concave roller mechanism works by concentrating tension ...

When Rollers Fight, Webs Lose

(Archive)

March 31, 2004, ... for every foot of span length. This “rule of thumb” will overestimate tram-related tracking errors for wide, thick, short span, and high-modulus webs. The tension variations from tram error are directly ...

Magpowr to Conduct Free Online Tech-Tips Seminar for Torque and Tension Control

(News | New Products)

November 09, 2003, ... Intl. co.) reports it will conduct a one-hour e-seminar via the Web on November 20, 2003. This first short, technology-focused seminar, says the web tension system manufacturer, will cover the most recent ...

Pay Attention to Tension

(Archive)

August 31, 2003, ... and output rolls. Of these five functions, four of them are dependent on good tension control. Q: How is tension created in most slitter/rewinders? A: Unwinding rolls typically are controlled by brakes ...

Winding Better Rolls

(Archive)

May 31, 2003, ... reasons. First, paper roll properties allow winding to extremely large-diameter build-up ratios, where the final roll's diameter may be 20x the core diameter. If tensioning torque is generated from the ...

Well Done Tension

(Magazine)

August 31, 2002, ... repeatedly. I'm also in love with an old gadget that makes web handling easier. It's the tension-measuring roller. There are a couple old designs and some new technology, but measuring web tension via ...

Dead On Slit Rolls

(Unprinted Rolls)

July 31, 2002, ... check’ to make sure everything is running and set up properly. Then there's a thorough, three-to-four-day training session for the machine operators, getting them familiar with tensions, the setup, and ...

Mapping Your Way to Better Tension Control

(Magazine)

March 31, 2002, Web handling defects often can be traced back to a specific location in your web line. Web tension at that location is always a prime factor in understanding Web handling defects often can be traced back ...

Pyramids and Wound Rolls: Long-Lasting Quality

(Magazine)

February 28, 2002, ... support. A pyramid's buildup and physical profile are analogous to the buildup and tension profile of a wound roll. Important core properties include core diameter, core wall thickness, and core material. ...

Harmonic System Gets Tension Under Control

(Magazine)

October 31, 2001, ... competitive four-color process market greatly improve — along with print quality — with the recent installation of a Conic harmonic differential tension control system from Nireco America Corp. The ...

Slitter Savvy: The Art of Winding Good Rolls

(Magazine)

July 31, 2001, ... each revolution will produce a tight and slack tension wave. These tension variations can distort the web and cause register variations in the process. The only way to minimize the effect of these tension ...

Slitter Savvy: Visual Roll Defects & Remedies

(Magazine)

July 31, 2001, ...  Start with proper tension, nip and/or torque. Splices: These necessary evils normally are due to web breaks or cutting out defective material in a parent roll. Most customers will allow up to three ...

Web Scratch Solution: Regulate Your Running Rolls

(Magazine)

June 30, 2001, ... This is because the web and roller surfaces carry boundary air as they move. And this boundary air has the ability to float the web out of contact with the roller surface. In a few cases, web tension ...

Over-Tensioned Webs and What to Do about Them

(Magazine)

May 31, 2001, Webs are often tensioned beyond their elastic limit in specialty-type processes such as metallizing. Usually, the high tension is in a zone where web Webs are often tensioned beyond their elastic limit ...