Grade B corrugated board is mainly made from a mixture of wood pulp and waste paper (OCC), with wood pulp accounting for about 15%-25%, and the rest being OCC. This structure makes the surface relatively flat while maintaining a certain fiber strength. Specifications: surface with 15-25% wood pulp, the rest is OCC; shorter fibers, strength is less than that of kraft paper. The paper surface is flat, with varying degrees of sizing (water absorption 30—55g/m2), and surface color treatment.
