Ordinary carton: it is divided into single pit (the three-layer paper layer is the face paper, the second layer is the core paper and the bottom paper), that is, the carton made of three-layer paper "the face paper on the outside, the corrugated paper in the middle and the box board paper on the inside", such as beer boxes, milk boxes and instant noodles boxes. The bearing capacity is relatively small, and corrugated paper generally adopts b-edge, C-edge or e-edge. There are also five layers of paper (the second layer is the face paper, the second layer is the core, every three layers is the separator, and the fourth layer is the core paper plus the bottom paper). For example, we often use ordinary cartons for express delivery, such as four barrels of edible oil and household appliances, such as televisions, washing machines, etc. Generally, the goods packed in ordinary cartons will not exceed 150kg.
Heavy duty carton: usually made of five layers of cardboard, also known as double pit paper, which is composed of five layers of paper, including face paper, corrugated paper, heart paper, corrugated paper and carton board. Almost all of these five layers weigh more than 180 grams per square meter. Generally, the outer layer of the ripple is B-shaped, the inner layer is A-shaped, or two A-shaped. Compression resistance and puncture resistance are greater than ordinary cartons. Seven layer paper box, also known as seven layer paper, consists of seven layers of paper, including face paper, core paper, separator paper, core paper and bottom paper.
It can install some mechanical equipment and large household appliances. The combination of corrugations is generally composed of B-shaped corrugations and A-shaped corrugations. It has BAC ridge and AAA ridge, and its compression resistance and puncture resistance are greater than the first two. Aa/aa heavy corrugated composite packaging is the product of "paper replacing wood" in the corrugated packaging industry.