Wound roll structures and practical applications
Michal, Neal J.
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Winding is an integral process in the manufacturing and converting of nearly all web materials such as paper, film, tissue, nonwovens, aluminum and steel. Wound rolls are the most convenient, economical, and most prevalent form of storage and transport for web materials.Wound rolls store web materials compactly without folding or cutting. Wound rolls are a form of compressed packaging. A roll that has been wound firm enough for routine handling in a converting process has often compressed the material by more than 25%.From a business standpoint, web materials are sold based on two broad categories: Geometry - Diameter, Width, Core Diameter, Roll Length, Lay flat properties, etc.; Physical Properties - Modulus, Tensile strength, Caliper, Softness, Color, etc.It is common to see defects such as: Loss of caliper in high loft webs; Telescoping, cinching, gross internal slippage; Large flat spots due to storage & handling; Floppy edges and baggy lanes; Slit width growth after winding; Roll blocking; Print registration shift.This presentation will explain how the material properties will determine which of two wound roll structures will result. Each of these will react differently when larger rolls are pursued. Proven methods to document your wound roll structure will be presented. Eight methods to improve your delivered quality will be offered.