Paper360 - March/April 2012 - (Page 30)

ROLL ALIGNMENT MILL WISE ALIGNING ROLLS in a Paper Machine Winder Proper alignment of rolling elements can prevent breakage, poor product quality and uneven rolls BILL WICK and PAUL BERBERIAN paper machine winder converts large jumbo rolls into sizes convenient for shipping. The most popular type is the two drum winder which winds rolls on a single axis with all the rolls being wound on a single axis. Two drum winders are typically used for standard newsprint, fine papers (tablet or copy papers, board grades, tissues, towels). Another type is the duplex winder which is used to wind paper that is more difficult to wind (magazine stock, high gloss specialty papers, enhanced newsprint). The surfaces of these papers are smooth and glossy. Individual rolls are supported and wound at separate winding stations. A The winder is considered a batch operation. It operates at speeds two- to two-anda-half times faster than the paper machine to stay ahead of production. Winders must also rapidly cycle massive components to reduce down time. It is not unusual for a jumbo roll to accelerate from zero to 7,500 RPM in one to two minutes, run and then decelerate to a stop. This can be repeated up to 160 times a day which requires strict controls to produce uniform rolls and prevent lost time from breakage. POTENTIAL PROBLEMS The very nature of the winding section— speed, weight, timing—makes it a critical part of the paper process. Some of the 30 Paper360º MARCH/APRIL 2012

Table of Contents for the Digital Edition of Paper360 - March/April 2012

Over the Wire . . . News Summary
Asian Innovation on the Rise
SPECIAL FEATURE: Tissue Industry
North America Shifts to Specialization
A Measured Success
Aligning Rolls in a Paper Machine Winder
Understanding Lightweighting
Sappi Biberist Tests a New Inline Sensor to Control OBAs and Colors
Process Control for Stickies
An Innovative Yankee Coating Program
Biopolymers in Papermaking
Best Practices in Product Development
Employee Work Restrictions Challenge Human Resources
Paper360° Online Exclusives
Association News

Paper360 - March/April 2012