I. Cardboard material classification

Cardboard material is categorized by weight per unit area.

In the mainland market there are mainly the following kinds of paperboard

K paper: 250g/M*M A paper: 175g/M*M B paper: 125g/M*M (these three generally imported paper) 7 paper: 200g/M*M 8 paper: 260g/M*M C paper: 127g/M*M (Taiwan paper)

Core paper: basic 100g/M *M Large machine 105-110g *M large machine 105-110g/M*M reinforced core paper: + paper 115g/M*M other reinforced core depending on the customer's situation, in Taiwan there are 130g, 140g, 150g, 180g, 190g/M*M reinforced core paper, but in mainland China are common 140g, 150g, 180g/M*M reinforced core paper.

II. Cardboard structure

1, cardboard structure refers to the number of cardboard ratio combinations, generally according to customer requirements to do the ratio, from the five-layer K Ⅲ K, K Ⅲ A to three-layer C Ⅱ can be.

2, pit (wave) refers to the cardboard cross-section of the hole. The common A wave, B wave, C wave, D wave, E wave. The mainland generally use B wave, C wave, E wave.

3, wave height: A wave = 5mm B wave = 3mm C wave = 4mm D wave = 2mm E wave = 1.5mm, five-ply paper two waves composed of BC pits, single-ply paper is generally used in the B pit.

Three. Carton form

Carton is generally divided into A-type, B-type, C-type, packing carton and beer box, knife card, partition.

1, A type: common A1: general standard type; A3: bottom without cover or cover without bottom type; A5: double cover completely interspersed.

2, partition refers to the carton in the upper, middle, lower, left and right objects are separated from each other to play a protective role of cardboard. The knife card refers to the same layer of objects in the honeycomb nest type packaging with a cut and interlocking cardboard.

3,C-type is the carton for shoes, which has a lid.

4, packaging carton: similar to the A5 carton, but generally directly affixed to the tape packaging, not nailed, can be divided into open or side-open type.

Carton material introduction, if good.

So it seems that K paper seems to be the best paper.

Generally use B=B, paper thickness of about 6mm, the material is the lowest. If the customer has a request, can also be used A = B, this material is better than B = B strength, the price is high,

and A = A paper quality than A = B, B = B good, the thickness of 6mm, the price is also high, unless the special requirements of the selection

Front letter (such as K A B) indicates the outer layer of paper quality, the middle symbols (such as =) indicates the number of layers, and the back letter indicates the inner layer of paper quality

W-white outer box A-good yellow box B-slightly worse yellow paper K-the best paper, the most expensive

W=A five-layer good paper white outer box W=B five-layer slightly worse paper white outer box W=A=B five-layer good inner slightly worse white outer box (this is a universal)

W=A five-layer good inner slightly worse white outer box (this is a universal)

A=B five-layer good inner slightly worse white outer box (this is a universal)

A=B five-layer yellow outer box (this is universal) 3A=B three-layer yellow outer box (medium) 3B three-layer yellow outer box (poor) doll car

A=B five-layer yellow A=A five-layer yellow W=A five-layer white W=B five-layer white

A3A three-layer yellow W3A three-layer white outer box W3K three-layer white outer box 3A three-layer yellow outer box (good)

Top paper:W stands for 160 gsm. White kraft; K represents 230g kraft; A represents 175g kraft; B represents 127g kraft; C represents 127g kraft hanging (imitation kraft);

The development of the printing process of the packaging carton

The printing process is an important process for the back-end processing of corrugated cartons, and for a long time, corrugated cartons have been widely used as the main form of a single form of transportation packaging, which For a long time, corrugated boxes have been widely used as the main form of single transportation packaging, which has led to the printing process remaining at the stage of simple line and text printing, and has not been able to achieve rapid development.

However, with the continuous development of the packaging market, the single transportation function of the carton has gradually changed to a sales function, and the purchasing psychology and aesthetic concepts of consumers have also been changing; the continuous growth of export commodities has also forced the domestic production of cartons to internationalization, with higher and higher requirements for post-printing processing on the one hand, and requirements for environmental protection of products on the other. Valiant carton is responsible for the double tasks of commodity transportation, commodity display and promotion. Its color is becoming more and more bright and eye-catching, and its pattern is becoming more and more beautifully printed, which is the only way to attract customers' interest and stimulate the desire to buy. This requires corrugated cartons to meet the strength of the same time to have excellent surface printing quality, multi-color color printing has gradually become the future direction of the development of carton printing.

Introduction to carton printing process

At present, China's corrugated carton printing methods are varied, mainly offset printing, flexo direct printing, flexo or gravure pre-printing, screen printing, and in recent years, the rise of the digital printing methods. Among them, ink flexo printing for corrugated cartons occupies the main market of carton printing with its advantages in plate material, ink, printing pressure, printing efficiency, etc. Each printing method has its own advantages. Each printing method has its own advantages and disadvantages and suitable printing range, according to the actual situation and the characteristics of the carton products to choose the appropriate printing process.

Carton offset printing process

Offset printing has a simple plate making process, low cost, fast speed advantages, is the most widely used indirect printing technology, in the printing of books, newspapers and magazines, paper packaging printing has been dominant. The graphic part of the printing plate and the blank part of the almost in the same plane, the printing of the first to the printing plate water supply, wetting its blank part, and then coated with ink, the application of the principle of oil and water repulsion will be ink transfer to the rubber blanket, and then transfer to the substrate, to complete the process of a printing.

Offset corrugated box printing is divided into offset indirect printing and direct printing. The indirect printing method is to print the corrugated box face paper first, and then use a single machine to re-laminate the corrugated. Offset printing products plus the number of lines up to 200 lines / inch, beautiful patterns, stable quality, high quality. ps version of the plate is easy to make, but also can be laminating, varnishing and other surface finishing process, in the current high-grade sales of packaging carton printing accounted for a considerable portion of the proportion.

Offset printing technology is relatively mature, fast printing speed, but the way is not suitable for cardboard linkage production line, the finished product production efficiency is low, complex processes, long cycle. As the offset printing process to the fountain solution, will increase the moisture content of the original paper, improper control is also prone to overprinting failure. Coupled with offset printing pressure, printing width is limited and other factors, can not meet the needs of high-volume carton production.

From the point of view of the cardboard processing technology, offset printing after the process of lamination, but also due to the pressure and the colloid left too much moisture, so that the carton of the flat compression strength, adhesive strength and other technical indicators are difficult to meet the requirements of high-grade goods on the packaging. In addition, offset printing is currently no relatively environmentally friendly ink use is also affecting the use of its promotion of another obstacle.

The development and use of micro-corrugated products is the future development trend of the carton industry, and offset printing is the best way to print and process them. The direct offset printing process for corrugated cartons is now more mature in foreign countries, and the production of corrugated cardboard can be put directly into a special offset printing machine for printing. The process can ensure the molding of the carton, but also to complete the exquisite face paper printing, but the requirements of the printing machine is higher, and more expensive, a longer period of time will not be in the domestic small and medium-sized enterprises to promote the use of.

Carton flexo printing process

Flexographic printing technology using a flexible photopolymer plate, its graphic part of the protrusion, the blank part of the concave, using the scraper, anilox rollers to pass the ink of the short ink path printing, belonging to one of the letterpress printing process.

Flexographic carton production process is also divided into flexographic direct printing and pre-printing two ways. Direct printing is the use of water-based ink directly on the corrugated cardboard for printing, is currently widely used in China's carton printing.

Flexographic printing has the advantages of large format, many colors and high quality. The maximum width of wide-format flexographic printing machine can reach 2.5m ~ 2.8m, satellite-type flexographic printing unit can print 6 colors at the same time. Flexographic printing using different screen line printing performance pattern, can make the dot delicate, colorful and strong consistency. In addition, the flexo printing method is light pressure printing, which is less destructive to the strength of corrugated board. Printing with water-based ink is less expensive and green, making it suitable for use as packaging for export commodities. This method can be linked to the production, printing, slotting, creasing and other processes can be completed at one time, and the efficiency is higher compared to the processing method of offset printing followed by laminating.

However, due to the flexible plate material is easy to deform under pressure, ink transfer and printing pressure issues are more difficult to control, the pattern of the highlights part of the network is easy to lose or increase the seriousness of the dark part of the network will be about 85% of the level of the field state, can be reproduced in a narrower range of grades, only about 8% to 85%, so some of the layers of the original manuscript will be very difficult to use the flexible version of the presentation of its rich layers and colors. color. Flexographic processing of cartons, the general production speed is about 100 meters per minute -300 meters, although many flexographic printing machine speed can reach 600 meters per minute, but if the speed of carton printing production, will be subject to ink formulations and surface treatment of the substrate and many other factors affect the printing faults. Coupled with the high-speed printing process is difficult to maintain the stability of the equipment, so that the multi-color overprinting beautiful patterns there are difficulties. This makes most of the current flexographic direct printing carton printing quality in the low-grade state, the printing speed has to be improved.

Advances in flexographic printing technology, ink and water quality will gradually improve the speed of flexographic printing problems. Such as the use of closed scraping system can fully ensure that less ink surface area in contact with the anilox rollers, diamond, hexagonal and other edged nets can provide a better flow of ink in the high-speed printing machine, can be better to maintain the ink system for the effective supply of ink.

Pre-printing process of carton

Pre-printing is mainly gravure pre-printing and flexo pre-printing, which is also gravure pre-printing is the main, is the use of gravure or flexo printing presses in the web for printing, printing is still receiving into the web, and then the printed web as a carton face paper on the tiling line to make a corrugated cardboard board, and then die-cutting into boxes of the process. Pre-printing directly on the smooth surface of the paper, compared with printing on the surface of the cardboard, can be richer levels, more vibrant colors, fine color printing, quality is more stable and reliable. Pre-printing process avoids the damage caused by direct printing on the strength of the carton, carton printing and molding quality are higher, using the web printing method, can realize no downtime for paper change, suitable for high quality, high-volume product production. Pre-printed patterns in the tile line for the production of cardboard, cut off the pattern should be considered when the factor, so to add photoelectric tracking cross-cutting control system on the cross-cutting knife, so that in the pattern of the demarcation can be accurately cut off the cardboard.

Chinese packaging carton inspection standards

China's carton production enterprises use the raw paper, if divided according to origin, can be simply divided into imported raw paper and domestic raw paper; if divided according to the varieties of raw paper, can be divided into kraft cardboard (also known as kraft boxboard), corrugated raw paper, and for the higher-grade packaging and printing of the whiteboard, kraft, coated Kraft paperboard, coated kraft paperboard and so on. Due to the rapid development of China's carton industry, the demand for raw paper is rising year by year, especially coated kraft paperboard, because it has both the advantages of kraft boxboard and coated whiteboard, but also has the strength of kraft boxboard and whiteboard printability, so imports are growing significantly. In recent years, although the overall quality of domestic raw paper has improved greatly, but compared with the quality of foreign raw paper there is still a gap, and even if individual paper mills can reach the same level abroad, but in some low grammage, high-strength kraft paper and corrugated paper production, due to the limited production capacity, can not meet the demand at present. Most are still dependent on imports. For imports of raw paper China's inspection and quarantine departments have specific provisions: in accordance with the provisions of the "Commodity Inspection Law", the inclusion of goods in the category table must be inspected by the inspection and quarantine agencies or their designated inspection departments, and shall not be sold and used without inspection. The vast majority of China's imports of cardboard boxes with raw paper are goods belonging to the statutory inspection, so they must be inspected. At present, the inspection and quarantine departments in the inspection of these papers, the inspection standards followed by the following broadly:

1. laws and regulations mandatory standards or other inspection standards must be implemented;

2. laws and regulations do not have a mandatory standard or other standards must be implemented in the inspection of the standard, according to the contract between the two sides of the trade agreed standard inspection. (If the laws and regulations of the mandatory standards are lower than the contractual standards, the contract should be agreed upon standards);

3. Neither of the above, in accordance with the standards of the country of production, the relevant international standards or standards designated by the state inspection and quarantine agencies. For there is no suitable testing standards, the choice of approved internal method standards.

Here for the above point 2 need to make a special note, in our actual inspection process found that most of the current domestic users in the trade contract on the quality of imported raw material paper terms and conditions are not enough agreement, or even no agreement, they tend to recognize only the brand and origin, and ignored the quality of the product itself fluctuations. The first half of this year, by our inspection and quarantine departments and found that there are quality problems in several batches of imported paper, but due to the customer in the contract did not agree in advance to receive the quality requirements and inspection standards, to the inspection and quarantine departments to issue a certificate of non-conformity has brought about difficulties to the customer's own request for claims and return shipments brought about by the trouble, so we call for imports of raw paper business should be in the contract to agree to the quality of the terms, in order to protect the their own earnings.

For the specific inspection of paper: safety, health, environmental protection, quality, quantity, weight, packaging and other items. Due to space relations, we only its conventional physical testing programs and the use of methodological standards for an introduction.

1. Appearance Inspection:

The appearance of paper inspection is one of the important test items, generally by the inspector on-site sample inspection and laboratory inspection of two components. Paper appearance defects, not only affect the appearance of paper, but also affect the use of paper. We use the inspection method standard: ISO, TAPPI standard, and SN/T 0874-2000 and the national standard GB/T 1541 dust degree test. The main use of light inspection, flat inspection, oblique inspection and hand touch inspection. Requirements for the paper surface is flat and clean, does not allow folding.

2. Physical properties test

Before carrying out physical properties test work, it must be based on the standard of paper for constant temperature, humidity pretreatment, due to the different paper required to carry out the test project is not the same, here is the main list of a few kinds:

(1) whiteboard paper

Good whiteboard paper generally requires a dense texture, smooth surface, thickness, consistency, paper surface without linting. Consistent, the paper surface is not hairy, good absorption, and small expansion rate, and can adapt to the requirements of multi-color overprinting. In order to adapt to the requirements of the box, whiteboard paper should also have a large stiffness, good folding resistance. The main importing countries are: South Korea, Indonesia, the United States, Japan, etc., especially the Japanese whiteboard paper quality is good. Testing projects are: quantitative, thickness, whiteness, smoothness, fracture length, breakage resistance, folding resistance, sizing, stiffness and IGT and so on.

(2) kraft cardboard:

Kraft cardboard, known as boxboard in China, is one of the main paper carton paper. Domestic boxboard paper is divided into three grades of superior, first-class, qualified products. Kraft paper texture must be tough, breakage resistance, ring compression strength and tear degree should be high, in addition to a high degree of water resistance. Due to the different processes and materials, in general, most of the quality of imported kraft cardboard is better than domestic kraft paper, especially to the United States produced kraft card of the best quality. Testing projects are: quantitative, thickness, tightness, breakage resistance, breakage resistance index, ring compression strength, transverse ring compression index, fracture length, tearing, sizing, moisture, cross-width quantitative difference, transverse folding resistance and so on.

(3) coated kraft cardboard, hanging kraft paper testing program is a reference to kraft cardboard and whiteboard.

(4) Corrugated medium:

Corrugated medium is one of the most important components of corrugated board. Corrugated cardboard requires good fiber bond strength, smooth paper surface, good tightness and stiffness, and a certain degree of elasticity to ensure that the carton made of shockproof and pressure-resistant ability. In addition, the moisture index should be controlled, moisture is too small, the paper is brittle, corrugated processing will occur rupture; moisture is too large, the paper is soft, will bring difficulties to the processing of molding. Generally, the moisture content of paper should be controlled at about 10%. Domestic corrugated paper is divided into four grades: A, B, C and D.

The test items are quantitative, thickness, tightness, breakage resistance, cyclic compression strength, transverse cyclic compression index, flat compression strength, fracture length, sizing, moisture and so on. Detection of the method used to the standard are: GB, SN, ISO, TAPPI, SCAN, JIS, and so on. Here is a simple example of China's test standards:

1.GB/T 451.2-2002 "paper and paperboard quantitative determination"

2.GB/T 451.3-2002 "paper and paperboard thickness determination"

3.GB/T 453-2002 "paper and paperboard tensile strength determination (constant velocity loading method)

4.GB/T 453-2002 "paper and paperboard strength determination (constant velocity loading method)

4.GB/T 453-2002 "paper and paperboard tensile strength determination (constant velocity loading method)

5. p>

4.GB/T 454-2002 "Determination of Paper Breakage Resistance"

5.GB/T 455-2002 "Determination of Tear Degree of Paper and Board"

6.GB/T 456-2002 "Determination of Smoothness of Paper and Board (Buick Method)"

7.GB/T 457-2002 "Determination of Folding Degree of Paper (Schopper Method)"

7. GB/T 457-2002 "Determination of Folding Resistance of Paper (Schopper's Method)"

8.GB/T 458-2002 "Determination of Air Permeability of Paper and Board (Schopper's Method)"

9.GB/T 459-2002 "Determination of Expansion and Contraction of Paper and Board"

10.GB/T 462-2003 "Determination of Moisture in Paper and Board"

11.GB/T 13024-2003 "Boxboard"

12.GB/T 13024-2003 "Determination of Smoothness of Boxboard"

13. GB/T 13024-2003 "Boxboard"

12.GB/T 13023-1991 "Corrugated Board"

13.SN/T0874-2000 "Import and Export Inspection Regulations for Paper and Board"

The above mentioned are some of the more conventional detection methods for carton paper, along with the rapid development of science and technology and the growing concern for environmental protection, carton paper is moving towards a new type of paper. With the rapid development of science and technology and people's growing concern for environmental protection, carton paper is to the functional and environmental protection direction. For example, anti-corrosion, anti-bacteria, oil, high temperature and other functional paper. Due to the current national standards for this type of special paper is not complete, some are being revised and developed in the process of the detection of this type of paper, inspection and quarantine departments generally refer to the relevant international standards, standards of exporting countries or manufacturers of standards. In addition to some of the raw paper used for food packaging cartons, but also must comply with China's relevant health standards, which is now the focus of our inspection and quarantine work, because it is directly related to the health and safety of our people. These paper involved in the inspection standards are:

1. GB 11680-89 "food packaging with raw paper hygiene standards"

2. GB 18192-2000 "aseptic packaging of liquid food with paper-based composite materials"

3. GB 18706-2002 "liquid food preservation packaging with paper-based composite materials (roof packs)". GB 18706-2002 "Liquid Food Fresh Packaging Paper Matrix Composites (Roofing Packages)" for some printed and used in food packaging paper must also be tested for heavy metal elements, such as lead, chromium, cadmium, mercury and other content.

In addition, the European Union countries now imported packaging cartons, strict control of the total content of heavy metal elements. The scope of the test covers a wide range, including the carton itself, nails, adhesives, contents and so on. Relevant testing standards are:

1.DD ENV 12498:1998 "Paper and board intended to come into contact with foodstuffs. Determination of cadmium, lead and chromium in an DD ENV 12498:1998 Paper and board intended to come into contact with foodstuffs. Determination of cadmium, lead and chromium in an aqueous extract. Determination of mercury in an aqueous extract " (" direct contact with food paper and cardboard mercury determination of water extraction method "); With the strengthening of people's awareness of environmental protection, the world's countries on the import of packaging have their own restrictions on the decree and provisions of our carton production enterprises in the international trade should pay special attention to prevent unnecessary losses. cause unnecessary losses. B 1.75 1.72

B=C 1.68 1.65

W=A 2.45 2.1

W=B 2.1 1.97

W=C 2.05 1.9

C=C 1.65 1.6

C=3 1.6 1.55

K3K 2.1 1.95 < /p>

K3A 1.75 1.67

K3B 1.6 1.58

A3A 1.5 1.45

A3B 1.32 1.32

B3B 1.15 1.2

B3C 1.10 1.09

B33 1.07 1.02

W3A 1.65 1.47

W3B 1.50 1.35

W3C 1.40 1.28

Remarks:1. Carton formula: (L+W+2)*(W+H+1)*2 unit price/1000

2. Flat card formula: (L+1)*(W+1)* unit price/1000

3. Beer box, beer card depends on the processing costs depending on the style

4. centimeters into inches formula: inches = centimeters * 2.54

5. K paper is the best paper. W paper is white paper.

6. I believe that you have some understanding of this, so I will say more here.

Additionally, there is one more thing. I do not want to type. COPY from the outside, everyone look:

The structure of the carton expression is as follows: tissue: paper name, weight / tile: tile strength, weight, flute / core paper: tile strength, weight / liner: paper name, weight

Example: tissue kraft card 300 grams / high-watt 180 grams (A/B flute) / core paper 180 grams of Puwu / 280 grams of liner cardboard

Corrugated carton pricing formula

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

A. Calculation of corrugated cardboard factory price per square meter

1. Composition of the corrugated cardboard

Corrugated cardboard is mainly divided into three layers of corrugated cardboard, five layers of corrugated cardboard, and seven layers of corrugated cardboard.

Three-layer corrugated cardboard is mainly used for packaging lightweight inner packaging, three-layer corrugated cardboard box is also called a single corrugated cardboard box its structure is made of a corrugated cardboard on both sides of the stick a face paper combination.

The five-layer corrugated carton is mainly used for single-piece packaging of lighter weight and fragile contents; the five-layer corrugated carton is also known as a double-corrugated carton, which used to be referred to as a triple-yellow two-watt. The structure of the five-layer corrugated carton is made of face paper, liner, two sheets of core paper and two sheets of corrugated paper bonded together, and the combination of flute type usually adopts the AB-type (the most common type of this type of pharmaceutical packaging in the Chongqing area), the AC-type, the BC-type, the AE-type or the BE-type.

Seven-layer corrugated carton consists of the following cardboard three-layer corrugated boxboard (mainly used for heavy-duty goods packaging, such as motorcycles, etc.);

Composition: from the face paper, corrugated paper, corrugated paper, core paper, corrugated paper, core paper, corrugated paper, corrugated paper, liner bonded and become. The combination of corrugated flute type usually adopts BAB type, BAA type, CAC type or BAC type

2. Uniform unit of measurement of corrugated board

1). General carton factory purchases face paper, liner paper, core paper, corrugated base paper are calculated in tons. That is, a variety of face paper, liner, core paper, corrugated paper for how many yuan per ton, the unit is expressed as "yuan / ton", and the calculation must be replaced by "yuan / kg",

such as the purchase price of 5200 yuan / ton, then the kilograms that is 5200 yuan / 1000kg = 5.20 yuan / kg. 1000kg = 5.20 yuan / kg.

2). General paper weight usually speak grams, in fact, should be how many grams per square meter that is, a variety of facial paper, lining paper, core paper, corrugated paper weight are "g / m2" as the representative unit for the calculation must be unified unit of its use, here we must put "g / m2" This is converted to "kg/m2".

If you purchase 300 grams of kraft paper, that is 300g/m2 of kraft paper, then "300g/m2" is converted to (300/1000)kg/m2", which is 0.3kg/m2.

3). Determination of the coefficient of corrugated cardboard production

Corrugated cardboard due to pressure corrugated caused by the shortening of the length of the paper in the direction of its shortening ratio known as the compression ratio coefficient. There is no uniform standard for this coefficient for each manufacturer because the production capacity and management level of each manufacturer directly affects the yield of corrugated paper. However, the packaging industry generally defaults to the following coefficient;

The compression ratio coefficient for A flute is 1.59, which means that 1.59 meters of corrugated cardboard will be 1 meter in length after being pressed into corrugated paper.

The compression ratio coefficient for B flute is 1.36, which means that 1.36 meters of corrugated paper is 1 meter long after corrugation.

The compression ratio coefficient of C flute is 1.50, i.e., 1.50 meters of corrugated paper is 1 meter long after corrugation.

The compression ratio coefficient of E flute is 1.27, i.e., 1.27 meters of corrugated paper is 1 meter long after corrugating.

3. Calculation of paper price per square meter for various kinds of corrugated cartons

(1) (1) Algorithm of face paper, liner paper and core paper

Example: the face paper of 350g/m2 with an inlet price of 4800RMB/ton should have the following price per square meter;

(4800/1000)×(350/1000)

=4.8×0.35

The price per square meter for the face paper of a corrugated box is 0.35×1.5g/m2. 0.35

=1.68 (yuan/square meter)

(2) (2) Algorithm of corrugated paper

Example: the import price of 1,800 yuan/ton of high-strength tiles is 180 grams/m2, and its price per square meter should be:

(1,800/1,000) x (180/1,000) x 1.59

=1.8 x 0.18×1.59

=0.516 (yuan/square meter)

4. Calculation of the cost price per square meter of raw materials for corrugated board

The existing customer wants to make a five-layer corrugated cardboard box, and asks for a kraft paper of 300 grams/higher tile of 180 grams (A/B flute)/grid of 180 grams of paper/lining of 280 grams of tea-board paper, and tries to calculate the cost price per square meter of the boxboard. Cost price per square meter.

The list calculation:

Paper name gram weight price (yuan / ton) ply coefficient calculation formula (yuan / per square meter)

Top paper kraft 300 5200 1 1 (300/1000) × (5200/1000) × 1 × 1 = 1.56

High tensile strength tiles 180 2250 2 (1.56 + 1.39) ( 180/1000) x (2250/1000) x 2 x 2.95 = 2.39

Core paper 180 1700 1 1 (180/1000) x (1700/1000) x 1 x 1 = 0.306

Lined tea board paper 280 2500 1 1 (280/1000) x (2500/1000) x 1 x 1 = 0.70

Total (yuan per square meter) = 4.96

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

The ex-factory price of a carton should include the total of the cost of raw materials for the carton and the other amortized expenses.

The other assessable costs include auxiliary materials (adhesives, ink, flat wire, power), depreciation of equipment, workers' wages, taxes, etc.

In the ex-factory price of a carton, the raw material cost of the carton generally accounts for 0.5-0.7, and the other assessable costs account for 0.5-0.3. Generally speaking, the manufacturers take the value that the raw material cost of the carton accounts for 0.65, and the other assessable costs account for 0.35. In the case of the easy projection, the value is 0.65, and the other assessable costs account for 0.35, and the other assessable costs account for 0.35. The use of labor and materials half that is 0.5 coefficient for both large estimates.

6. Corrugated cardboard factory price

Cartonboard factory price = cost per square meter of raw materials for cartonboard / 0.65

As noted in the "4. Cost per square meter of raw materials for cartonboard," the information provided in the calculation of the factory price of cartonboard should be calculated as follows;

Cartonboard factory price = 4.96/0.65 = 7.63 yuan per square meter