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What do AA and AB mean in cardboard boxes? How to distinguish between 3-layer, 5-layer, and 7-layer?

The terms AA and AB for cardboard refer to the different layers of corrugated paperboard. A three-layer board consists of one layer of liner, one layer of corrugated paper, and one layer of inner paper, while a five-layer board is made up of one layer of liner, one layer of core paper, two layers of corrugated paper, and one layer of inner paper.

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Box AA and AB refer to different layers of corrugated cardboard. A three-layer board consists of one layer of face paper, one layer of corrugated paper, and one layer of liner paper. A five-layer board consists of one layer of face paper, one layer of core paper, two layers of corrugated paper, and one layer of liner paper. A seven-layer board consists of one layer of face paper, one layer of core paper, three layers of corrugated paper, and one layer of liner paper. The common types of corrugation are a, c, b, e, etc. In a three-layer board, the type of corrugated paper can be one of these types; in a five-layer board, it is a combination of two types, such as ab, bc, ac, bb, be, etc.; in a seven-layer board, it is a combination of three types, such as bcb, bac, ccb, etc.

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