Corrugated board is made of face paper, inner paper, core paper and corrugated paper by bonding. According to the demand of commodity packaging, corrugated board can be processed into single-sided corrugated board, three-layer corrugated board, five-layer, seven-layer and eleven-layer corrugated board. Corrugated boards with different corrugated shapes have different functions. Even if the same quality of face paper and inner paper are used, the performance of corrugated board is different because of the different shapes. At present, there are four kinds of corrugated grooves commonly used in the world, namely, A-type groove, C-type groove, B-type groove and E-type groove. See table 1 for their technical indicators and requirements. Corrugated board made of A-type corrugated board has good cushioning and certain elasticity, while C-type corrugated board is superior to A-type corrugated board made of cold porcelain. But the stiffness and impact resistance are better than that of A-beam. The density of B-shaped ribs is high, and the corrugated board made of B-shaped ribs has a flat surface and high pressure, which is suitable for printing. E-beam is thin and dense, which shows its rigidity and strength. The difference between container and non-container mainly lies in the outer diameter, which is closely related to corrugated type. The following table will list in detail the relationship among carton inner diameter specifications, manufacturing specifications and outer diameter specifications:

Relationship between inner and outer diameters of corrugated boxes and manufacturing specifications

Measuring method for manufacturing dimensions of corrugated boxes

The manufacturing size of the carton is the blanking size when making the carton. The manufacturing dimension is based on the punching line on the unfolded box blank. The indentation roller on the slitting machine presses a groove at the line pressing position, and the line pressing is the center line of this groove. The distance between two stamping lines is the manufacturing dimension. The manufacturing dimensions can be quickly converted into internal and external dimensions through Table 2, but they also have their own measurement methods.

Corrugated boxes can be divided into single splicing and double splicing in the manufacturing process.

The single piece is a one-page forming box, which is generally used for cartons with small circumference; Double splicing is also called two-page frame. Some cartons are too big in circumference, so they should be put together with two blanks. But sometimes, in order to make use of the scraps cut in the production process, the carton factory will use two pieces to make a small carton, and sometimes even four pieces will be used. Compared with the single-page frame, the double-page frame has one more joint, so there are some subtle differences in the area calculation of the two frames.

Joints and rings

The manufacturing size of carton joints is determined according to the number of corrugated layers and the production technology level. The single corrugated board is 35 ~ 40mm, the double corrugated board is 45 ~ 50mm, and the triple corrugated board is 50mm.

When calculating the unfolded area of the carton, the loss of recycled yarn in the manufacturing process must be taken into account. The size of recycled yarn is determined according to the number of cardboard layers, which is generally 20 ~ 40 mm

In order to facilitate the calculation in practical work, the rule of "8" plus "4" is adopted uniformly, that is, the total number of joints and rings in the horizontal direction is 8cm, and the total number of rings in the vertical direction is 4cm.

1, calculation formula of flat box area

Through the above introduction, the area calculation of flat box can be expressed by the following two formulas:

The area of a single carton is s = [(length+width) × 2+8 ]× (width+height +4).

The area of double-layer packaging carton is s = [(length+width +8) × 2 ]× (width+height +4).

Note: The units of length, width, height, 8 and 4 are centimeters.

Development Zone of Upper Full Cover and Lower Socket Carton

Cartons with full cover at the top and sockets at the bottom are generally small, some are corrugated boards, and some are only single-layer coated white cardboard, such as small outer packaging of medicines, food and cosmetics.

Cutting length and tile height

In the process of corrugated box manufacturing, it is particularly important to distinguish the concepts of cutting length and tiling height. Once a mistake is made, the strength of the cartons will be thousands of miles away, resulting in all the cartons produced being scrapped, causing huge losses.

Cutting length refers to the length perpendicular to the corrugation direction; Tile height refers to the length along the corrugated direction.

Joints and rings

The size of the joint here is determined according to the number of layers of the carton. The joint of the three-layer box is generally 3cm, and that of the five-layer box is generally 4cm. The size of silk is calculated by 2 cm.

2. Calculation formula of carton area with full cover and socket under it

Cutting length: L= (length+width) × 2+ connector+filament.

Tiling height: H= 1/2 width+socket+height+width+rewinding.

Area S= L × H

Note: In general, the area of cartons is calculated with reference to the physical objects. After the cartons are unfolded, the specific dimensions are analyzed according to the specific shapes of different cartons. Length, width and height are all fixed by accurate measurement, and the dimensions of joints and coils are flexible according to different situations.

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