Web Lines

Your Guide to the Right Web Guide

Webs are blind they don't know where they are going. With a well-aligned roller, sufficient tension, and good traction, the web has a tendency to track

Buyers & Suppliers: Can We Dance?

Buying equipment is a partnership between the equipment buyers and equipment suppliers. The dance begins when a buyer has a need (and hopefully the money)

Web Lines: Thinking About New Equipment?

A new year often brings new budgets and thoughts about new equipment. If you are lucky enough to be handed a project to buy new converting equipment,

Get a Grip: Driving Your Web

In my October 2007 column, In Search of Tension Isolation, I myth-busted the belief that a high traction driven roller can completely isolate one tension

Differential Winding Limits: Part I

The purpose of differential winding is to apply a desired torque to two or more rolls winding on a single shaft. Differential winding allows multiple rolls to turn at differing speeds, with each roll free to slip at the speed required to compensate for roll-to-roll diameter variations and strand-to-strand length variations.

In Search of Tension Isolation

In web handling, one of the myths told most frequently is that of the independent tension zone, protected from other tension zones by the protective powers of the tension isolation. Like most myths, we want to believe, but alas, scientific reason is the myth buster.

Support Your Rollers

How should a roller be supported or attached to your equipment? To answer this question, let’s review your roller support needs and your options to meet these needs.

Baggy Webs: Part 4 Minimizing

What does minimizing a baggy web mean? Two things. First, we would like to minimize the level of bagginess in our webs. Second, we would like to minimize the waste associated with running the inevitable baggy web in our processes. To minimize the creation of baggy webs, we must take on their causes.

Baggy Webs: Part III-Causes

We know baggy webs are a problem and we know we can measure them. What do we do next? First, we need to find a way to fix it in the short term. Second, we can work on a long-term plan to prevent baggy webs from happening.

Under Pressure (A Brighter Look)

Mr. Starcevic taught my 8th grade algebra class and was one of my most memorable teachers. He quizzed us every week, and as he passed out our graded results,

Baggy Webs: Part II Measuring

I'm not usually a big fan of management adages, but this is one I often can support: You can't manage what you don't measure. How do you expect a defect

Baggy Webs: Part I Nightmares

This is the first of four columns on baggy webs, starting with understanding the problems they create. To most converters, the ideal web is one that is

Under Pressure (Revisited...and Revised)

If I have any repeating theme to understanding web handling, it is to follow the stresses and strains. In nipped processes, you need to follow the compressive stress (aka pressure).

Don't Get Bent out of Shape

Bending a web is like bending a pencil or a wire. A little bending is no problem, but if you go too far, something will get bent out of shape or break.

Twist & Shout

A wrinkle is the web’s equivalent of a shout—stop it, you’re hurting me! To avoid your web shouting at you, think about how to apply uniform tension across it.

How to Drive a Winding Roll

What is the best way to drive a winding roll? You have three choices: from the surface, from the center, or both.

Dancer Rollers: Trust but verify

In last month’s tension quiz, I gave out five points if your process had a calibrated tension transducer roller. Those of you with dancer rollers might have wondered why you didn’t get any points. Why am I “dissing” dancers?

Web Tension: A Pop Quiz

Today's column is a pop quiz on web tensioning. Feel free to work as a team on the answers. If you score poorly, don't worry, but it's worth your while

Difficult Winding: Part II

Last month I introduced you to roll modulus ratio, the first of the terrible trifecta of difficult winding. This month let's move on to the next two of

What Makes Winding Difficult?

What is it that allows one product to run all year with 2% waste and another can't get on the core without problems? Consider this a lesson in product

Whatever Floats Your Web

Why float a web? Because air floating can do things a roller can’t.

The Pressure of Winding Rolls

Too much pressure inside a roll means more wound roll problems. Too little pressure inside a roll has its own negative effects. Worse still is having both high and low internal pressure occuring at the same time.

Deflecting Nip Roller Problems?

What causes nip roller deflection? How can you compensate for nip roller deflection?

If Not Rough, How About Groovy?

Even though rough surfaces have a bad reputation, rough is better than smooth to fight lubrication from air or liquid lubrication. But is rough the best solution?

Are You Rough Enough?

What is the better roller surface to prevent web scratching, smooth or rough? Many people will opt for smooth, but in fact, this is the wrong direction.

Why Isn't Your Slitter Running?

Walk by any slitter and more likely than not, it won’t be running. Why? Besides having no input material or no demand for slitting, your slitter likely is not running because the slitter operator is busy doing all the work needed to support the slitter. Your slitter may not be running, but I bet your slitter operator is.

Converting Rx: Bowed Roller Dosage

Last month we picked up our prescription for bowed roller and read the instructions and warning label. But what's in that bottle? How do we know we have the right dosage of bowed roller? Let's combine a little diagnosis and diagramming to see how to find the proper prescription.

Converting Rx for Bowed Rollers

At the top of my list of converting controlled substances: bowed rollers. Let’s read the “Directions for Use” fine print on the bowed roller bottle.

The Case for Automatic Splicing

The risks of manual at-speed splicing should not be played down. Every time you ask an operator to crawl into or lean over a turret winder to make a slice and tuck transfer, you are playing Russian roulette with a possible broken arm, cracked ribs, or most unforgivable, loss of life.

The Converting Relay Race: Part II

Our rolls are loaded, spliced, and ready to run. To complete the unwinding relay, we need to finish strong with our plan for web alignment and tension control.

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