Web Lines
Web Lines | Winding Process Fundamentals, Pt. 3
- Published: May 09, 2013, By Timothy J. Walker
In Part 3 of this four-part series, web handling expert Tim Walker answers the question: How do dimensional changes within a roll (e.g., compression) change roll strains and stresses?
Basics: What Are the Key Process Variables of Winding?
- Published: May 03, 2013
Basic definitions of tension, nip, and torque help describe what variables are important when winding a roll.
What impact can temperature change have on a roll?
- Published: February 28, 2013
The best rule of thumb is to avoid heating or cooling winding or wound rolls. Keep a roll's temperature stable.
Web Lines | Winding Process Fundamentals, Pt. 2
- Published: February 19, 2013, By Timothy J. Walker
In Part 2 of this four-part series, web handling expert Tim Walker tackles tension control from the first to the final lap of the winding roll
Eliminating Tin-Canning Rings on Your Wound Rolls
- Published: January 25, 2013
The elimination of roll rings that simulate rings on a tin soup can is a perennial problem for web handling experts. This list of possible solutions might work for you.
Web Lines | Winding Process Fundamentals, Pt. 1
- Published: January 14, 2013, By Timothy J. Walker
Understanding winding, roll defects, and winding-related web quality begins with understanding how the web, winder design, and process conditions combine to create the stress and strains of the wound roll.
Web Handling | To Break or Not To Break--What is the Tension?
- Published: December 03, 2012
Determining at what tension a web will break or deform comes down to a material's property.
Web Lines | Why Bigger Cores?
- Published: November 16, 2012, By Timothy J. Walker
Bigger cores avoid many winding defects. Fewer layers mean less near-core pressure buildup and high-pressure defects.
Web Handling Q&A on Lateral Web Movement
- Published: October 19, 2012
In the field of web handling, debates still rage over whether a baggy web tracks to its tight or loose side. This answer contributes to the discussion and may help settle the score.
WebHandlersQuiz #19: Advantages of a Nipped or Gap-Controlled Roller
- Published: October 01, 2012
WebHandlersQuiz #19: What are the three advantages of using a nipped or gap-controlled roller ahead of winding?
Web Lines | Why Avoid Nips?
- Published: September 25, 2012, By Timothy J. Walker
I recently posted my top three blind recommendations for any process. If you are a long-time reader of Web Lines, you will know why to avoid nips and use bigger cores, but if not, here is a quick refresher on those topics.
Workshop on Nipped Systems & Laminating
- Published: September 05, 2012
A workshop focusing on nipped rollers offers a better understanding of the underlying engineering principles and design considerations that lead to improved profitability in your value-added web processing operations.
Web Lines | Measure Tension Wherever Possible
- Published: August 14, 2012, By Timothy J. Walker
Web tension is the heartbeat of your process. There is no greater measurement of process quality than on-line tension measurement in all tension zones.
WebHandlersQuiz #18: Which Rolls Tighter—Paper or Film?
- Published: August 10, 2012
Which—paper or film (with equal dimensions and winding conditions)—will likely have higher internal roll pressures?
WebHandlersQuiz #17: Winding at Constant Torque
- Published: July 27, 2012
If you center wind at constant torque, what is the percent change in tension if the roll diameter changes from 100 mm to 400 mm?
WHQuiz Answer #14 - Web Wrinkling and Deflection (2)
- Published: March 23, 2012
WebHandlersQuiz 16: Spreading - Name a spreader or anti-wrinkle roller that does NOT have a rubber surface? Answer...
WHQuiz Answer #14 - Web Wrinkling and Deflection
- Published: March 21, 2012
WebHandlersQuiz 15: Wrinkling – If a roller is deflecting into a bowed shape due to gravity, which direction is it best NOT to approach that roller if you don’t want to wrinkle: vertically from above, vertically from below, or horizontally? Answer...
WHQuiz Answer #13 - Web Wrinkling vs. Speed
- Published: March 19, 2012
WebHandlersQuiz 13: Wrinkling - If you see wrinkles at low speeds, but the wrinkles go away at higher speeds, what is the most likely reason? Answer...
WHQuiz Answer #12 -Web Tracking
- Published: March 16, 2012
WebHandlersQuiz 12: Web Tracking – In a vertical span, which will cause the web to track off center more, a roller tram or level error? Answer...
WHQuiz Answer #11 - Intermediate Guiding
- Published: March 14, 2012
WebHandlersQuiz 11: Guiding - For automatic guiding in the middle of a process, which is preferred – A steering type guide or a displacement type guide? Answer...
WHQuiz Answer #10 - Laminate Curl
- Published: March 09, 2012
WebHandlersQuiz 10: Laminating – If a two-layer laminate product curls to the top layer in the machine direction, which would reduce the curl: increase or decrease the top layer pre-laminate tension? Answer...
WHQuiz Answer #8 - Nipped Driven Rollers
- Published: March 07, 2012
WebHandlersQuiz 8: Traction – When is a nipped roller needed on a driven roller separating two tension zones? Answer...
WHQuiz Answer #9 - Nip Uniformity
- Published: March 07, 2012
WebHandlersQuiz 9: Nipped Rollers - What is a simple measurement to determine if two nip rollers are pressing together uniformly? Answer...
WHQuiz Answer #7 - Large Diameter Rollers
- Published: March 05, 2012
WebHandlersQuiz 7: Rollers – Which rollers in a process will likely have the largest diameters? Answer...
WHQuiz Answer #6 - Roller Alignment
- Published: March 02, 2012
WebHandlersQuiz 6: Rollers - What is a reasonable specification for roller alignment in mm/m, milli-radians, or mils/in? Answer...
WHQuiz Answer #5 - Draw Control Pros/Cons
- Published: February 29, 2012
WebHandlersQuiz 5: Tension (Draw) Control – Name one advantage and one disadvantage of draw control (a.k.a. as speed ratio control)? Answer...
WHQuiz Answer #4 - Load Cell Roller Advantages
- Published: February 26, 2012
WebHandlersQuiz 4: Tension Control – Name one advantage of using a tension load cell roller has over a dancer roller in a closed-loop tension control system? Answer...
WHQuiz Answer #3 - Dancer Roller Advantages
- Published: February 24, 2012
WebHandlersQuiz 3: Tension Control – Name one advantage of using a dancer roller has over a tension load cell roller in a closed-loop tension control system? Answer...
A Viking Fan at Lambeau? What I do for Web Handling...
- Published: February 22, 2012
I will be attending my first Converter's Expo on March 1 in Green Bay, WI. As a MN Viking season ticket holder, it is a little bit like stepping in to the Lion's den (or Bear's den), but to share web handling knowledge, I'll do it.
WHQuiz Answer #2 - Crossweb Tension Variations
- Published: February 21, 2012
WebHandlersQuiz 2: Tension Control – Name three causes of tension variations across the web’s width (i.e. things would create a loose edge or center)?
