Search
- Baggy Webs: Part I Nightmares
- (Archive)
- March 31, 2007, ... spoils the ideal dream for many converters is a baggy web, one with non-uniform geometry in the plane of the web, usually crossweb variations in length. Web bagginess is one of the main quality complaints ...
- Twist & Shout
- (Web Lines)
- December 31, 2006, ... excessively high shear, compressive or tensile stresses, and it will shout at you to stop it in the voice of buckling, wrinkles, creases, bagginess, or web breaks. Twisting is defined as deforming a ...
- The Pressure of Winding Rolls
- (Magazine)
- April 26, 2006, ... tacky films block. Add core impressions, starring, spoking, crushed cores, and cores stuck on shafts. Worst of all, more yielding and permanent deformation increases, causing bagginess or loose edges. ...
- The Secret Strain
- (Magazine)
- December 30, 2005, ... alignment, roller diameter variations, or web bagginess. Web strain explains why wound rolls on the same winder can turn out so different. How is strain important to web tensioning? Most webs are elastic, ...
- Converting Rx for Bowed Rollers
- (Web Lines)
- October 30, 2005, ... most expanded positions on the bowed roller. 5. A bowed roller can tighten up symmetrical web bagginess, whether baggy edges or a baggy center. If the wrap is shifted toward the most contracted side ...
- Why Tension?
- (Magazine)
- January 30, 2005, ... or yield the web. Don’t run at 90% of a web’s break point and figure a 10% safety factor is enough. Roller misalignment, roller diameter variations, and web bagginess all are capable of create extreme ...
- Who Likes Film?
- (Magazine)
- December 30, 2004, ... to spin more easily. Film Challenge #2: Films will have more winding and wound roll problems, such as core crushing, blocking winding-induced bagginess, and telescoping. The telescoping problems are related ...
- 10 Tips on Antiwrinkle Rollers
- (Magazine)
- September 29, 2004, ... perfect balance. The pulling imbalance will vary with tension, bagginess, and friction variations, creating an unwanted web wander. Use antiwrinkle rollers ahead of nips. Many converters have found by ...
- Tracking Wrinkles: Part II
- (Magazine)
- May 31, 2004, ... enough force on the web to create or hold it in a wrinkled shape. The last tracking wrinkle source is web bagginess or length variations. The wrinkle mechanism is similar to tracking wrinkles from ...
- Tracking Wrinkles: Part I
- (Magazine)
- April 30, 2004, ... an oversimplification. There are three primary mechanisms that can cause a web to shift laterally: roller misalignment, roller diameter variations, and web bagginess. Any of these tracking mechanisms ...
- Reduce Web Nip Problems
- (Magazine)
- January 31, 2004, ... bagginess out of the web. The metering nature of a nip wants to feed a uniform length of web over all cross-web lanes. Any untensioned baggy lanes will accumulate any excess length upstream of the nip ...
- Pay Attention to Tension
- (Archive)
- August 31, 2003, ... debris generation. Q: What causes low tension at slitting? A: There are at least four causes for low tension at slitting. Low unwind tension, negative draw, web bagginess, and low post-slitting tension. ...
- Winding Better Rolls
- (Archive)
- May 31, 2003, ... the winding roll. Q: How does winding entry span length promote tracking and wrinkling defects? A: The three sources of web tracking error are misalignment, diameter variations, and web bagginess. ...
- Differential Rewinding: Part One
- (Magazine)
- October 31, 2002, ... winding comes from either web bagginess (from cross-web length variations) or roll-to-roll diameter variations (from cross-web thickness variations). Even before the onset of slackness, these variations ...
- Stripe Slitting: The Challenge of Staying within the Lines
- (Magazine)
- May 31, 2002, ... and splices. The input roll should not exceed the web guide's range or rate. Any web bagginess should be pulled out easily with normal tensions. Input material variability may be the most difficult of these ...
- European Conference Draws Large Audience
- (Magazine)
- September 30, 2001, ... width of a web. A papermaker will also include basis weight and moisture with caliper as a measure of profile. Some say that a web with baggy lanes has a poor profile. Bagginess is a variation of machine ...