Do you know how to calculate the weight of cartons

Do you know how to calculate the weight of cartons

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core tip: the measurement of carton weight is an important work content in carton factory. Carton factory needs to measure carton weight during export customs declaration and statistical output. Not only that, some customers even regard the carton weight as one of the standards of carton incoming inspection. Although the carton weight test method is very simple, it is easy to be affected by moisture, resulting in the deviation of the measured value of carton weight from the true value. In addition to providing the measurement method of carton weight, this paper also focuses on two relatively easy to operate calculation methods of carton weight, which can greatly facilitate the carton factory to control the carton weight

the measurement of carton weight is an important work in the carton factory. The carton factory needs to measure the carton weight during export customs declaration and statistical output. Not only that, some customers even regard the carton weight as one of the standards of carton incoming inspection. Although the carton weight test method is very simple, it is easy to be affected by moisture, resulting in the deviation of the measured value of carton weight from the true value. In addition to providing the measurement method of carton weight, this paper also focuses on two relatively easy to operate calculation methods of carton weight, which can greatly facilitate the carton factory to control the carton weight

box weight measurement method

measuring tool

electronic balance with an accuracy of more than 1 gram, the weighing range should be in kilograms

selection of samples

three samples are randomly selected from the same batch of cartons for testing

sample treatment

the sample treatment shall be in accordance with gb/t 10739 standard, that is, it shall be weighed after being balanced in the environment with relative humidity of (50 ± 2)% and temperature of 23 ± 1 ℃ for more than 24 hours. The temperature and humidity balance treatment of the sample is very important to obtain an objective and consistent box weight. For the sample without temperature and humidity balance treatment, the measured box weight error can reach more than 15%. For example, if the weight of a carton after temperature and humidity balance treatment is measured to be 1kg, it will not be treated in a temperature and humidity environment. Even if it is the same carton, its weight may be between 960g and 1150G

test results

test the box weight of three samples respectively, and calculate the average value of the three weight values, that is, the single box weight of this batch of cartons

method of quickly testing box weight

the most troubled factor in box weight measurement is the moisture content of cartons. Many carton factories or carton customers are limited by delivery time or test conditions, and weigh them without temperature and humidity balance treatment, resulting in significant deviation from the true value of cartons. Here, we will provide you with a method to accurately test the weight of the box without temperature and humidity balance

principle of rapid measurement of carton weight

a large number of experimental data show that after the carton is fully balanced in the standard temperature and humidity environment, the moisture content is about 8%, while the dry weight of the carton is unchanged. Therefore, as long as we measure the weight and moisture content of the carton without temperature and humidity balance, we can calculate the true weight of the carton

measuring tool

electronic balance, oven or digital infrared moisture tester with an accuracy of more than 1G. The oven can be used to test the moisture content of the carton, but it still takes 1 hour to test. The digital infrared moisture tester can read the moisture content of the carton instantly, and its accuracy can reach more than 1%, which can fully meet the needs of accurate moisture testing

measurement method

1. Three cartons are randomly selected from a batch of cartons as test samples

2. Weigh the box weight of three samples respectively and take the average value. The measured value is the reference weight, expressed in MC, in grams

3. Measure the moisture of three samples respectively, and take the average value. The measured value is expressed in W, and the unit is "%"

4. Finally, by substituting the measured MC value and W value into the formula, the standard value after temperature humidity balance can be calculated, expressed in M. Calculation formula of standard container weight: m= MC × (1-W)/92%

take three samples from a batch of cartons, the average measured box weight is 1285g, and the average measured moisture is 13%. Try to calculate the box weight after temperature and humidity balance treatment, and substitute the above value into the formula: m= MC × (1-W)/92 wood based panel universal testing machine generally performs gb/t17657 ⑴ 999 "methods for testing the physical and chemical properties of wood-based panels and veneered wood-based panels"%= 1285 × (%)/92% =1215

calculation method of carton weight

the calculation method of carton weight is actually relatively simple, that is, add the weight of each layer of base paper that makes up the corrugated cardboard, and then add the weight of the adhesive in the cardboard to get the weight of the carton. Among them, the weight of face, septum and lining paper is the area of corrugated board multiplied by the gram weight of base paper, and the weight of pit paper is the product of corrugated board area, corrugated elongation coefficient and gram weight of base paper. The weight of the adhesive can be obtained from the parameter table

carton weight calculation formula

single pit paperboard weight: ws=s* (g1+g2+r*gm+g1)

double pit paperboard weight: wd=s* (g1+g2+g3+r*gm+r1*gm1+g2)

three pit paperboard weight: wt=s* (g1+g2+g3+g4+r*gm+r1*gm1+r2*gm2+g3)

where: WS, WD, WT respectively it indicates that the single pit, double pit and three pit paperboard can also carry out the automatic control of experimental weight of constant speed loading, constant speed deformation and constant speed displacement at the same time; G1, G2, G3 and G4 are the gram weight of corrugated board surface paper, lining paper and spacer paper per unit area (g/m2); R, R1 and R2 represent corrugation elongation coefficient; GM, GM1 and GM2 respectively represent the gram weight of the core paper (g/m2); G1, G2 and G3 respectively represent the gram weight of corrugated board adhesive (g/m2); S refers to the area of corrugated board

1. The area of corrugated board can be obtained by actual measurement or calculation

2. The width of adhesive strip is 40mm by default, except in special cases

3. The weight of the slotting and unloading of the carton can be ignored, and the bumps added at the shaking part of the carton can basically offset it

3. The accuracy of this calculation method is within ± 5%

there is an ordinary flat lap carton with paper configuration of 250k/112f/112f/112f/250k and external dimension of 1400px × 1000px × 325px, try to calculate its customs declaration weight. The area s of this ordinary box has a short service life = (w+h) *2 (l+w) + area of adhesive strip = (40+13) cm*2*2400px+100px*13 » 1.02m2. According to the table, the elongation coefficient of a ridge is r=1.53, and the elongation coefficient of b ridge is r1=1.40, The amount of adhesive per square meter g=15+20=35g/m2

is substituted into the formula wd=s* (g1+g2+g3+r*gm+r1*gm1+g2) =1.02 * (250+11 2+250+1.53 *112+1.40*112+35) =1.02 * 940=959g

the tolerance standard of carton weight

generally, the tolerance standard of carton weight should be set within the range of ± 4%, because the tolerance of the base paper and adhesive constituting the carton itself is also within the range of ± 4%.The. Some carton customers do not understand this rule and set the carton weight tolerance within ± 2%, which is difficult to achieve