Web Lines

Web Lines | The Case of the Missing Pacer

How can a system with only two slipping torque elements control speed?

Web Lines | Wrinkling?

Can we predict differences in wrinkle sensitivity of different products? Here are 3 simple tests.

Web Lines | Why Is Winding Optimization Difficult?

Winding is hard work—hard on your brain. Are you ready to get your Ph.D. in web handling?

Web Lines | War on Bagginess

A program to reducing bagginess begins with quantifying it, reducing thickness variations, and minimizing winding stresses and strains.

Web Lines | The Case for Shorter (and Longer) Acceleration Times

Should you change the acceleration time on your slitter/rewinder? Web handling expert Tim Walker offers the pros and cons

Web Lines | How the Open Loop Torque Control Sets Winding Tension

There are many winding machines that do not use closed-loop tension control in the winding process. Here is how they work.

Web Lines | Winding Process Fundamentals, Pt. 4

In Part 4 of this four-part series, web handling expert Tim Walker explains how TD variations in equipment or web properties affect roll structure

Web Lines | Curl Mechanics Pt. 2—Transverse Direction Curl

In Part 2 of this four-part series on curl, web handling expert Tim Walker tackles three common sources of TD curl.

Web Lines | Curl Mechanics Pt. 1—Machine Direction Curl

In this first part of a four part series on curl, web handling expert Tim Walker discusses curl in coated and laminated products

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?

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

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 Lines | Why Bigger Cores?

Bigger cores avoid many winding defects. Fewer layers mean less near-core pressure buildup and high-pressure defects.

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.

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.

Web Lines | Test Your Web Handling Knowledge

Can you pass this 20-question quiz to prove you understand basic principles of web handling?

Web Lines | Blocking in Rolls

Get out of the hockey puck business…

Web Lines | A Rant from Tim Walker

 Why don’t equipment suppliers include a display of the process variable that is critical to running successfully?

Web Lines: Take the Laminator Quiz

How does your laminator rate compared to the ideal design?

Plotting Shear Wrinkles

The combined conditions of when roller misalignment is bad enough to wrinkle a web is a complicated mechanism. You have to combine concepts of roller misalignment, web buckling, and web-to-roller traction

Web Lines: Wrinkling of Foils

In our everyday lives, our main experience with foil likely comes from wrapping a potato in kitchen-grade aluminum foil. Wrinkling thin aluminum foil

Web Lines: Is Wound Roll Pressure Greater Than Tire Pressure?

I'll bet you that your wound roll has more internal pressure than a car tire. To win this bet, I have to prove that internal roll pressure is above 30

Web Lines: Displacement vs Steering | Battle of the Web Guides

Tim Walker Addresses Displacement Guides, Known as Offset Pivot Guides, and Steering Guides that Have Differing Uses for Providing Intermediate Corrections of Laterial Web Position

Do You Want Nips with That? Part 2

No nips, please. To qualify this statement, I just want to get rid of unnecessary nips, especially for preventing slip on tension controlling drive rollers.

Web Lines: Would You Like Nips with That?

No nips, please. I need a button that says this. Every day, dumpsters and truckloads around the converting world are filled with waste generated due to

Web Lines: Limitations of Vacuum Pull Rollers

I love vacuum pull rollers (VPRs). When it comes to driving a web without slipping and scratching or to knowing you have control of the tension differential

Web Lines: Don't Flip Out - It's Just a Web Flip

The first time you see a web flip, you will wonder if you are looking at an M.C. Escher drawing. Escher was famous for his castles where you could walk

Web Lines: Blow Away Your Roller

What can reverse the direction of your web without touching it? What can redirect a web's running angle or inclination with the tension losses of roller

Reflections on Deflection

After reading last month's column, you should have resolved all of your deflecting roller problems. However, the alert web handler is not done with deflection

Web Lines: Q&A on Roller Deflection

Here are five frequently asked questions about roller deflection with my responses. Next month, we'll talk more about deflection, but instead of rollers,

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