scope:

This International Standard gives a procedure for determining the curl of paper and board using a vertically suspended test piece, and defines the terms used in curl measurement. This International Standard may be used to paper or board as received or after exposure to a constant climatic condition, such as a test room or print shop. measure any curl when - the curl formed approximates the arc of a circle; - the curl is stable enough to remain constant during the time required to cut the test pieces and make the measurement. This primarily includes curl in paper or board as received or after exposure to a constant climatic condition, such as a test room or print shop.