REDUCING TOP PLY BASIS WEIGHT OF WHITE TOP LINERBOARD IN PAPER OR PAPERBOARD

摘要

The present invention relates to multi-ply paper and paperboard products in which individual plies are formed of lingo-cellulosic fibers having different GE brightnesses. The paper or paperboard substrate having top and bottom surfaces comprises a base ply having top and bottom surfaces and comprising ligno cellulosic fibers having a first brightness x. A top ply having top and bottom surfaces comprising ligno cellulosic fibers having a second brightness y which is greater than the first brightness x. The top surface of the top ply forms the top surface of the substrate. An intermediate layer having top and bottom surfaces positioned between the top and base plies. The intermediate layer comprises an organic and inorganic material. The intermediate layer is configured such that the paper or paperboard has a top surface third brightness z which is greater that the first brightness x and is equal to or less than the second brightness y.