1. Composition of corrugated cardboard

Corrugated board is mainly divided into three-layer corrugated board, five-layer corrugated board and seven-layer corrugated board.

The three-layer corrugated paper box is mainly used for packaging lighter weight inner packaging. The three-layer corrugated paper box is also called a single corrugated paper box. Its structure is composed of a piece of corrugated paper bonded to each side of a piece of paper.

The five-layer corrugated box is mainly used for the light weight and fragile contents of a single package; the five-layer corrugated box is also called a double corrugated box, which was referred to as three yellow and two tiles in the past. The structure of the five-layer corrugated cardboard box is made of face paper, backing paper, two core papers and two corrugated papers. The combination of corrugated type usually adopts AB type (the most packaging type in Chongqing area), AC type, BC Type, AE type or BE type.

The seven-layer corrugated cardboard box is composed of the following paperboards and the three-layer corrugated cardboard paper (mainly used for the packaging of heavy goods, such as motorcycles, etc.);

Composition: It is formed by bonding face paper, corrugated paper, core paper, corrugated paper, core paper, corrugated paper and backing paper. Corrugated corrugated type usually adopts BAB type, BAA type, CAC type or BAC type

2. Unified unit of measurement for corrugated cardboard

1). When the general carton factory purchases tissue paper, backing paper, core paper, and corrugated base paper, it is calculated in tons. That is how many yuan per ton for various facial paper, backing paper, core paper and corrugated base paper, the unit is expressed as "yuan / ton", and it must be replaced by "yuan / kg" when calculating, such as the purchase price is 5200 yuan / ton , Then it is 5200 yuan / 1000kg = 5.20 yuan / kg in kilograms.

2). The weight of general paper is usually gram weight, in fact, it should be how many gram weight per square meter, that is, the weight of various facial paper, liner paper, core paper, corrugated base paper are all represented by "g / m2" as the unit The dosage unit must be unified. Here, "gram / m2" must be converted into "kg / m2".

If you buy 300 grams of kraft paper, that is, 300g / m2 kraft paper, then convert "300g / m2" into (300/1000) kg / m2 ", you will get 0.3kg / m2.

3). Determination of the coefficient of corrugated paper made from corrugated base paper

Corrugated base paper is shortened in the longitudinal direction of the paper due to the corrugation of the corrugated paper. The shortening ratio is called the compression ratio factor. There is no uniform standard among manufacturers for this coefficient, the reason lies in the production capacity and management level of each manufacturer.

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