Web Lines

Web Lines | Winding Process Fundamentals, Pt. 3

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?

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?

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

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

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

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?

Determining at what tension a web will break or deform comes down to a material's property.

Web Lines | Why Bigger Cores?

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

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

WebHandlersQuiz #19: What are the three advantages of using a nipped or gap-controlled roller ahead of winding?

Web Lines | Why Avoid Nips?

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

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

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?

Which—paper or film (with equal dimensions and winding conditions)—will likely have higher internal roll pressures?

WebHandlersQuiz #17: Winding at Constant Torque

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)

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

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

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

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

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

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

WebHandlersQuiz 8: Traction – When is a nipped roller needed on a driven roller separating two tension zones?  Answer...

WHQuiz Answer #9 - Nip Uniformity

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

WebHandlersQuiz 7: Rollers – Which rollers in a process will likely have the largest diameters? Answer...

WHQuiz Answer #6 - Roller Alignment

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

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

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

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...

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

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)?

 

 

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