1. Corrugated cardboard composition
Corrugated paperboard is mainly divided into three-layer corrugated cardboard, five-layer corrugated cardboard and seven-layer corrugated cardboard.
The three-layer corrugated carton is mainly used for packaging lighter weight inner packagings. The three-layer corrugated carton is also called a single corrugated carton. The structure of the three-layer corrugated carton is a combination of two sheets of corrugated paper each with a face paper.
The five-layer corrugated carton is mainly used for single-piece packaging of lighter weight and easily broken contents; the five-layer corrugated carton is also called double corrugated carton, which was formerly referred to as "three yellow and two watts." The structure of the five-layer corrugated carton is formed by the bonding of face paper, inner paper, two core papers and two corrugated papers. The combination of the 楞 type is usually AB type (the drug packaging in Chongqing is the most type), AC type, BC Type, AE type or BE type.
The seven-layer corrugated carton consists of the following paperboards and three-layer corrugated cardboard (mainly used for the packaging of heavy goods such as motorcycles);
Composition: Bonded by face paper, corrugated paper, core paper, corrugated paper, core paper, corrugated paper, and paper. Corrugated type combinations are generally BAB type, BAA type, CAC type or BAC type.
2. Uniform corrugated paper unit of measure
1) General carton factory purchase paper, paper, paper, corrugated paper are calculated in tons. That is, various types of paper, paper, paper and corrugated paper are expressed in yuan per ton. The unit is expressed as “yuan/tonâ€, and the calculation must be replaced with “yuan/kgâ€. For example, the purchase price is 5,200 yuan/ton. According to kilograms, it is 5200 yuan/1000kg=5.20 yuan/kg.
2) The weight of general paper is usually grammage. Actually, it should be the number of grammograms per square meter. That is, the weights of all kinds of facial paper, inner paper, core paper and corrugated medium are represented by "g/m2". To unify its usage unit, here must convert "g/m2" to "kg/m2".
Such as the purchase of 300 grams of kraft paper, which is 300g/m2 kraft paper, this time will be "300 g/m2" converted (300/1000) kg/m2", then get 0.3kg/m2.
3) Determination of coefficient of corrugated paper made from corrugated base paper
The corrugated base paper is called the compression ratio coefficient because it shortens the length of the paper after pressing the corrugation. There is no uniform standard for this factor in each manufacturer. The reason lies in the production capacity and management level of each manufacturer.
