Sometimes it is necessary to encode intelligent information into a moving web at high speeds. The most common information encoded is that of incrementing length or footage. Other information that can be encoded relates to roll-ID or lot numbers. The encoded information entered at high speeds is “read” and decoded downstream and used for process control.
High precision distance encoding and reading is applied in different manufacturing steps to enable accurate positioning of defects on defect map and to enable automated or manual off-spec paper rejection