Linerboard refers to the outer and inner liner sheets that cover the corrugated medium in corrugated cardboard. It is usually made from kraft paper or recycled fibers, providing both structural strength and a printable surface. The outer liner (top sheet) often carries brand graphics or protective coatings, while the inner liner supports the board’s rigidity. Linerboard is a key material in mailer boxes, shipping cartons, and eco-friendly fashion packaging.
