Concave Rollers Pros & Cons

Published: June 30, 2005

Got some nasty wrinkles on a roller? Some tape here, some tape there—wrinkles be gone. Adding tape collars or bands to a cylindrical roller just under each of the web’s edges turns a cylindrical roller into a wrinkle-stopping concave roller.

You're Too Tense!

Published: May 31, 2005

When planning to purchase tension controls, there is a lot for the converter to consider. "It's not just as easy as buying brand X controller and throwing it on your system and away you go." Here are some of the important questions to consider.

Drawing Conclusions: Part II

Published: May 31, 2005

The principles of draw control usually create a good deal of confusion. Let’s pick up where we left off in my last column and see if we can move from drawing confusions to draw control conclusions.

Introduction to Roll Handling

Published: April 30, 2005

Proper roll handling methods are required to ensure plant personnel safety and to minimize losses associated with roll damage.

Drawing Conclusions: Part 1

Published: April 30, 2005

In planning the tension control for any web line, there are only three options: tension control, torque control, and draw control. Between any two rollers or rolls controlled by a motor, brake, or clutch, you have to select one of these three choices.

Clean Thinking

Published: March 31, 2005

What is your definition of clean? What people think of as "clean enough" in their home is staggeringly different. Hopefully, your definition for your converting operation is the same as that of your customers.

Detecting the Edge

Published: March 31, 2005

Web guides have evolved dramatically since their first appearance on converting lines in the 1930s. Electronic edge detectors and electric motors gradually displaced pneumatics and hydraulics as demand grew for greater accuracy and reliability, and tolerance for leaky hydraulics diminished. The earliest electronic systems were far from perfect—in particular the edge detectors were sensitive to dust and temperature swings—but they were a big improvement over their predecessors

Get Out of the Scroll Business

Published: February 28, 2005

Curl will kill your product. How do webs end up curly? Let’s go over the top causes and consider how to eliminate them.

Why Tension?

Published: January 31, 2005

Why is tensioning such a crucial first step? What are the benefits of a well-tensioned web? What is the right amount of tension for your product? Don’t slack off now...keep reading for these answers and more.

Who Likes Film?

Published: December 31, 2004

Customers like films because they are cool. Films can be clear, thin, shiny, clean, and elastic. Product designers like films because they are functional. Films can improve a product’s break strength, tear resistance, and gas barrier performance. Process people like films because…wait. Do process people like films?

Web Tension 101

Published: November 30, 2004

Typically, tension is measured in PLI (pounds per linear inch) in the US. If you know PLI and you want to know total tension applied to the web, multiply PLI times the width of the material in inches. If you know total pounds of tension applied to the web and you want to know PLI, divide the total pounds of tension across the web by the width of the web in inches.

The Harms of Harmony

Published: November 30, 2004

From a simple handling viewpoint, these harmonic motion hiccups may be no problem, but combined with coating, extrusion, slitting, or winding operations, they may lead to waste.

Mechanics of Tension Control, Part II

Published: November 30, 2004

For this basic tutorial in the mechanics of web tension control, tension is defined as the force applied to a continuous web of material in the machine direction.

Slitting Debris: Cracking the Case

Published: October 31, 2004

Dust and debris are a common but unwanted side product of slitting. Slitting debris comprises the small particles that break off a product's edge during the slitting process. It is created through fracture and abrasion. Uncontrolled slitting debris will lead to defects in your customer's product and equipment downtime.

10 Tips on Antiwrinkle Rollers

Published: September 30, 2004

Antiwrinkle rollers, like antiperspirants and anti-inflammatories, have a name that implies a cure to your problem. But as with most remedies, read the