Corrugated cardboard has two layers of corrugated cardboard, three layers of corrugated cardboard, five layers of corrugated cardboard, and even seven layers of corrugated cardboard. Then, what kind of cardboard is usually used for fruit carton packaging, because double-layer corrugated cardboard is a liner, a layer of corrugated base paper is bonded at 20%, and the cost is low, and it is only used as a separator and liner in fruit packaging; Three-layer corrugated cardboard, generally used for inner packaging, also used for grid board or layering. Liner; double corrugated cardboard, that is, five-layer corrugated cardboard, usually used for export packaging due to its good compressive strength.