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The Converting Relay Race: Part II

(Magazine)

August 30, 2005, ... web or to a physical reference mark. For short, compact processes, the small amount of web wander through the system combined with good input roll straightness will meet the downstream process requirements. ...

The Converting Relay Race: Part 1

(Magazine)

July 30, 2005, ... such as a coater. The zero-speed splicer works with a web accumulator to feed the downstream process while the stopped-web auto splice is made. Zero-speed splicers are good when a product is difficult ...

Concave Rollers Pros & Cons

(Magazine)

June 29, 2005, ... diameter-induced tension differential from upstream to downstream sides. Con #3: Concave rollers made from tape may cause contamination. If you look at tape collars that have been on too long, you’ll ...

Truth or Myth?

(Magazine)

May 30, 2005, ... buyer need to understand the factors that influence the slide angle. There are two major facets of this property that come into play. Will the package perform properly during downstream processing, ...

Tech Specs

(Magazine)

April 29, 2005, ... include universal deck concept; random deck change; downstream unit (UV, cold seal, rotogravure, laminating); automatic washing system; and sleeve change system for plate cylinder and anilox rollers by ...

The Harms of Harmony

(Magazine)

November 29, 2004, ... completely isolates tension upsets from passing from zone to zone. Every tension zone works off the baseline of the incoming web strain. As tension and web strain change upstream, downstream tension zones ...

Slitting Debris: Cracking the Case

(Magazine)

October 30, 2004, ... Slitting debris also will go downstream, clinging onto the top, bottom, and side surfaces of slit edges. Rubber rollers downstream of slitting will develop dust rings aligned to the slit edge contact. ...

Extrusion Dies

(Magazine)

October 30, 2004, ... in a buildup of polymer along either edge of the coating that must be trimmed away downstream. In contrast to external systems, full-plug internal deckles completely seal off the ends of the internal ...

10 Tips on Antiwrinkle Rollers

(Magazine)

September 29, 2004, ... upstream wrinkle first. Wrinkles flow downstream. Antiwrinkle rollers are designed to prevent wrinkles, not pull them out. This is a remedy, not a bandage. More is not better. Use only the number of antiwrinkle ...

Discoloration Resistant Polyolefin Films

(Magazine)

September 29, 2004, ... and white pigmented films. Manufacturers of film grade polyolefins and the downstream fabricators of film products often look for new advances in polymer stabilization to ensure that they can provide ...

The Signs of Shear Wrinkle

(Magazine)

July 31, 2004, ... More misalignment will create larger troughs. With even more misalignment and web bending, the buckled, trough-shaped web will travel over the downstream roller, forming a wrinkle and crease defect. Note: ...

Steering Directions Made Simple

(Magazine)

June 29, 2004, ... to steer the web in the entry span, not the exit span. These wrap and pivot plan guidelines will set up the steering guide to bend upstream and twist downstream of the steering roller, creating the least ...

Tracking Wrinkles: Part II

(Magazine)

May 31, 2004, ... at a distance. As tension varies across the web width, the difference in the centerline of web tension upstream versus downstream applies a bending moment to the web. Torque will bend or curve a web. ...

Tracking Wrinkles: Part I

(Magazine)

April 30, 2004, ... of rotation across its width, similar to a bowed anti-wrinkle roller. When the bowed roller is oriented pointing downstream, it is a powerful spreader. However, if the bow orientation points upstream, ...

When Rollers Fight, Webs Lose

(Archive)

March 31, 2004, ... line to stay on track, keep your rollers and equipment sections parallel. If sequential rollers are not parallel, the upstream and downstream rollers will fight each other. When rollers fight, the web ...

Products

(Magazine)

February 29, 2004, New products for the converting industry from: Accuweb, Battenfeld Gloucester, Conquip, Contech, Convertech, Dover Flexo Electronics, DVT Corp., Esko-Graphics, Extech Instruments, Faustel, Gigahertz-Optik, ...

Reduce Web Nip Problems

(Magazine)

January 31, 2004, ... downstream roller. Nips are notorious for subtle non-uniformities that create tracking or shear wrinkles. Both of these wrinkle mechanisms are less likely with shorter spans. Adjustable rollers can ...

Small Flexing, Big Benefits

(Magazine)

October 30, 2003, ...  Will the web re-gather on the downstream side of the flexible spiral roller when the tension and flute deflection is removed? No, remember the spreading is 50+ times the mechanical deflection. Without ...

Pay Attention to Tension

(Archive)

August 31, 2003, ... obvious value is added to your product, but once the value is in, every downstream process should be treated with equal respect. Waste created on slitter/rewinders has the same or greater value than waste ...

A Slippery Answer to Web Scratching

(Magazine)

June 30, 2003, ... strain proportional to the upstream tension. But the web strain needs to make a transition to the downstream tension, and it does this while on the roller. For many webs, the change in strain from tension ...