This is a rolling or peeling plybond test that is used exclusively for multiply products. The test device was developed years ago by BRDA, the Boxboard Research and Development Association (now RPTA, Recycled PaperboardTechnical Association).
It is very good at detecting poor bonding between plys inmulti-ply products, but at the same time it is not heavily influenced by the internal bonding of the individual plys. The test has been used for multi-ply coated paperboard and coated and uncoated cylinder board.
BRDA Plybond from Applied Paper Technology