Cardboard is a strong, thick, high-volume paper. In the past, it was proposed to use quantification as the basis for dividing: paper, cardboard, and paperboard.
About 200g/m2 white thick paper, the surface is smooth, after calendering, high stiffness, also known as thin cardboard.
A kind of paper produced by multi-roll calendering has higher purity of paper color, more uniform ink absorption, better folding resistance, and is mainly used for commodity packaging box, product surface lining, picture wall chart, etc.
White paper is small in stretchability and toughness, and it is not easy to break when folded. It is mainly used for printing packaging boxes and merchandise-based paper. In bookbinding, medium-diameter paper (ridge strips) or cover for spine-bound and hardcover books. There are special and ordinary, single-sided and double-sided points. According to the bottom of the classification of gray and white two.