TELESCOPING OF ADHESIVE COATED WOUND ROLLS

摘要

Many web products, such as tape and labels, are coated with an adhesive. Rolls of these materials might bewound with straight edges, but later during storage these rolls may telescope sideways for no apparentreason. These rolls may also be prone to going egg-shaped when core supported or forming flat spots whensupported on the bilge.As we will see, the common ingredient in all of these roll defects is adhesive shear. As such, we willhereafter view certain adhesives as a ‘grease’ rather than as a ‘glue.’ PSA’s, or Pressure SensitiveAdhesives, are certainly prone to this behavior. However, any adhesive that does not cure to a true solidcould also be problematic. While these adhesives may in the short term hold the roll together, in the longterm they lubricate the layers and thus free the wound roll to move.As is expected of many winding problems, these defects might be reduced by attention to winding tensionand taper. Other solutions, perhaps even more powerful, include design of the coating, wound roll, rollpackaging and roll storage. Finally, attention to a level gage and tension profile across the width canminimize the forces that drive telescoping.