Web Lines

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,

Web Lines: Web Length per Roller Revolution=?

When a roller rotates, how much web does it feed forward per revolution? At first, the answer seems obvious: It feeds forward a length of web equal to

Web Lines: Mission-Detect Nip Variations

How To Detect Nip Variations To Create a Uniform Web Product

Web Lines: How To Control Roller Nips

If you want to compress something, you always have two choices. You can use either one of the following options: Put it in a vise or C-clamp and slowly

Web Lines: Are You Getting the Shaft?

Getting the shaft may sound bad in street lingo, but in winding there are good and bad aspects of whether you want to get the shaft (wind with a shaft

Web Lines: Do You Need an Auto Web Guide?

Does every web process need an automatic web guide? Maybe two? If I was in sales for a web guide supplier, I would say, Of course! and How about three?

Force Is Needed to Shift a Web

When your web isn't where you want it to be, you have two choices: You can be happy where it is, or you can try to move it to where you want it. If you

Web Guiding | Lateral Motion Causes

Where is your web? In the machine direction, hopefully, it is continuously running between your upstream and downstream processes. But where is it laterally?

Web Lines: Your Guide to Web Guiding | Part 1

Web guiding done right is easy to forget. The principles of web guiding are well understood. With good decisions in the design phase of a process and

Web Lines: Pitch & Catch Guiding

If you are like me, you find yourself thinking about spring as a way to cope with long winter days. For many, spring means baseball. A good way to combine

Web Lines: What Is a Tension Zone & How Many Are Needed?

Tension and speed control are the two most fundamental purposes of any web handling system. Speed control is easy for most people to understand, since

What Is the Right Tension?

Of all the questions about web handling, the most-asked question has to be: What is the right web handling tension for my product? This is a great question

Cores | The Foundation of Winding

Where would you prefer to build your next house on swamp land or solid bedrock? This should be an easy question since it's clear a house starts with the

A Torque Devil Is in the Details

In center winders, like the classic Rolling Stones song, you can't always get what you want. Imagine you need to buy a new center-driven winder or unwinder.

Time for Unwinding Upgrade?

How do you know when its time to upgrade from a brake-controlled to a driven unwinding process?

Winding Doesn't Add Up

When things in life are linear, they make sense. Driving two hours usually gets you twice as far as driving one hour. Adding two doughnuts a day to your

Playing the Wrinkle Blame Game

Imagine you are an unwind operator. You unwrap the next roll of input material, splice it into the machine, and hit the run button. Then you see them

Stress & Strain

A properly tensioned web always will lead to better slitting. Good tensioning is important up to, through, and out of the slitting blades. A poorly tensioned

The Coefficient of Winding Trouble

In winding, the important coefficient of friction (COF) is always about the two surfaces that will come in contact as the entering layer hits the winding

The Great Span Length Debate | Part 2

Last month, we debated roller spacing (a.k.a. web span length) relative to cost, safety, out-of-plane deviations from gravity, bagginess, and misalignment. Let's continue the debate.

The Great Span Length Debate | Part 1

There are at least half a dozen things that come to mind in the great span length debate. Let's review the checklist to figure out what span length is right for you.

How Much Misalignment Is Trouble?

Shear wrinkles are the most common wrinkle mechanism, forming a diagonal crease and appearing to walk across rollers like an inch worm. The way to create

How Much Misalignment Is Trouble?

Most converting equipment suppliers and manufacturers take care to ensure the rollers of their machines are aligned. Designing for good alignment, machining

Who's Driving This Nip?

What is the best way to drive a set of nipped rollers? Two rollers and two drive options (driven or not) lead to four options. To make this discussion

Shifty Answers to Nip-Induced Tracking

Nipping rollers are used in many value-adding processes in web converting roll coating, laminating, embossing, calendering, high-speed winding, and more.

Do You Have a Need for Speed?

Faster, faster, faster. As you reach the designed capacity of your existing process, before buying new equipment, most converters will ask if they simply

A Wealth of Accumulators

A good accumulator should be like money in the bank easy to deposit and readily available to withdraw when you need it. A web accumulator is like a bank,

Winding: What We Know & What We Don't Know

Winding is an amazingly complex process. Our understanding of winding can be broken into three areas: the winding process, winder design, and wound roll

Idler Roller Bearings: Living the Good Long Life?

Most bearings are designed for a hard life, expecting to end up on a drive shaft of a high-speed motor with a heavy load. Some bearings, however, end

Web Lines: The Spin on Idler Roller Testing

It's an election year, so I'd like to join the political pundits and offer some spin of my own, but my spin will be free of political opinions. Instead,

Subscribe to PFFC's EClips Newsletter