Corrugated paper cost estimation and ex-factory price guidance

Corrugated box pricing formula

Carton price (yuan) = corrugated cardboard factory price per square meter (yuan / m2) × carton expansion area (m2)

1. Calculation of factory price per square meter of corrugated cardboard

1. 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 is per ton for various facial paper, backing paper, core paper and corrugated base paper, and the unit is expressed as "yuan / ton", and it must be replaced by "yuan / kg" when calculating, such as the purchase price is 5,000 yuan / ton , Then it is 5000 yuan / 1000kg = 5.00 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 purchase 500 grams of kraft paper, that is, 500g / m2 kraft paper, then convert "500g / m2" to (500/1000) kg / m2 ", you will get 0.5kg / 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 for each factor in this factor for this factor. The reason is that the production capacity and management level of each factor directly affect the yield of corrugated paper, but the packaging industry generally defaults to the following factor;

The compression ratio of A flute is 1.59, that is, 1.59 meters of corrugated paper is 1 meter long after being corrugated.

The compression ratio of B flute is 1.36, that is, 1.36 meters of corrugated paper is 1 meter long after corrugated.

The compression ratio of C flute is 1.50, that is, 1.50 meters of corrugated paper is 1 meter long after being corrugated.

The compression ratio of E flute is 1.27, that is, 1.27 meters of corrugated paper is 1 meter long after corrugated.

2. Calculation of paper price per square meter of various paper in corrugated boxes

(1) Algorithm examples of facial paper, backing paper, and core paper: the surface paper with a purchase price of 5,000 yuan / ton is 350 g / m2, and the price per square should be; (5000/1000) × (350/1000) = 5 × 0.35 = 1.75 (yuan / square meter)

(2) Algorithm example of corrugated paper: the high-strength tile with a purchase price of 2000 yuan / ton is 180 g / m2, and the price per square meter should be: (2000/1000) × (180/1000) × 1.59 = 2 × 0.18 × 1.59 = 0.5724 (yuan / square meter)

3. Calculation of the cost price per square meter of corrugated cardboard raw materials

Existing customers want to make a five-layer corrugated cardboard box, which requires the use of facial paper as kraft card 300 g / high watt 180 g (A / B corrugated) / grid paper 180 g Pu / li paper 280 g tea board paper, try to calculate the box board paper Cost price per square meter.

Calculation list:

Paper name Gram weight Purchase price (Yuan / ton) Number of layers Coefficient Calculation formula (Yuan / per square meter)
Paper kraft card 300 5200 1 (300/1000) × (5200/1000) × 1 × 1 = 1.56
High-strength tile paper 180 2250 2 (1.56 + 1.39) (180/1000) × (2250/1000) × 2 × 2.95 = 2.39
Core paper 180 1700 1 1 (180/1000) × (1700/1000) × 1 × 1 = 0.306
Lin paper tea board paper 280 2500 1 1 (280/1000) × (2500/1000) × 1 × 1 = 0.70
Sum (yuan / per square meter) = 4.965

The main factors and coefficients for calculating the ex-factory price of corrugated board

The carton ex-factory price should include the sum of the carton raw material cost price and other amortized expenses. Other amortizable expenses include auxiliary materials (adhesives, inks, flat yarn, power), equipment depreciation, workers ’salaries, taxes, etc. In the ex-factory price of cartons, the cost of general carton materials accounts for 0.5

~ 0.7, other apportioned expenses account for 0.5 ~ 0.3, general factory value is carton raw material cost accounted for 0.65, other apportioned expense accounted for 0.35 The simple calculation uses labor and materials to estimate the coefficient of half or 0.5.

4. Ex-factory price of corrugated cardboard

The ex-factory price of the cardboard paper = the cost price per square meter of the raw material of the cardboard paper / 0.65 based on the information provided in "Calculation of the cost price of the raw material of the cardboard paper per square meter", the ex-factory price of the cardboard paper should be calculated as

Ex-factory price of cardboard paper = 4.96 / 0.65 = 7.63 yuan / m2

Carton area calculation

1) The unfolding surface of the carton is divided into a single piece with four sides and a single piece with two sides

2) Calculation formula of carton area

The carton factory produces most of the raw materials used for carton is roll paper, the general width of the roll paper is 960mm, 1100mm, 1600mm and 1940mm, can also be customized according to user requirements. The width of the carton plant's equipment is 2.2m wide, generally 1.6m.
The carton area is calculated as follows: the width of the equipment (assuming the width of the equipment is X meters) divided by the carton (width + height + 0.06m) to take an integer (assuming this integer is y) then y represents the width energy of the equipment Simultaneously produce several carton boards. Therefore, when designing the carton, we should consider the width and height of the carton as much as possible. That is, the designer should give priority to the number of rows and the number of layers to meet the sales count and the number of open papers. Due to the small number of paper cuts, the single cost of the carton is increased.

The width of the carton's valuation area is X ÷ Y = B, and the length of the carton's valuation area is the carton's (length + width + 0.06) × 2 + 0.04 = A, that is, A is the length of the carton's calculated area, so the area of ​​the carton is B × A = S, that is, S is the area of ​​the carton when it is priced. The units of length, width and height in the formula are meters (m). The formula 0.06 represents the trimming amount of the carton board in the length and width directions is 60mm, 0.04 is the tongue edge, these two values ​​can only be increased , A value that cannot be reduced.

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