Corrugated cardboard is made of top paper, lining paper, core paper and corrugated paper processed into corrugated corrugations through bonding. According to the needs of product packaging, corrugated cardboard can be processed into single-layer corrugated cardboard, three-layer corrugated cardboard, five-layer, seven-layer, eleven-layer and other corrugated cardboard. Different corrugated corrugated shapes have different functions of bonded corrugated cardboard. Even if the same quality of top paper and lining paper are used, the performance of the corrugated board will be different due to the difference in flute shape. Currently, there are four types of corrugated corrugated boards commonly used in the world, namely A-type stare blankly, C-type stare blankly, B-type stare blankly and E-type stare blankly. Their technical indicators and requirements are shown in Table 1. Corrugated board made of type A stare blankly has good buffering properties and a certain degree of elasticity, and type C going A while at type A stare blankly. However, its stiffness and impact resistance are better than those of type A; type B's arrangement density is high, the surface of the corrugated board made from it is flat, its pressure-bearing capacity is high, and it is suitable for printing; type E's thinness and density make it more rigid. strength. The difference between containers and non-containers is mainly in the outer diameter, and is closely related to the corrugation type. The following table lists the relationship between the inner diameter specifications, manufacturing specifications, and outer diameter specifications of the carton in detail:
The relationship between the inner diameter, outer diameter and manufacturing specifications of the corrugated carton
Corrugated paper Measuring method of box manufacturing dimensions
The manufacturing dimensions of cartons are the blanking dimensions during box making. The manufacturing dimensions are measured based on the pressure line on the unfolded box blank. The creasing roller on the slitting machine presses a groove at the pressing line position, and the pressing line is the center line of the groove. The distance between the two pressing lines is the manufacturing size. Converting manufacturing dimensions to inner and outer diameter dimensions can be done quickly using Table 2, but they also have their own measurement methods.
The manufacturing process of corrugated cartons can be divided into single-piece and double-piece boxes.
Single-piece is a one-page forming box, generally used for cartons with smaller circumference; double-piece is also called It is a two-page box. Some cartons have too much circumference and have to be pieced together from two pieces of box blanks. However, sometimes the carton factory will use two pieces to piece together a carton that is not too big in order to use the remaining materials cut during the production process. Cartons, even sometimes four pieces are used. Compared with the one-page box, the two-page box has one more joint, so there are some slight differences in the area calculation between the two.
Joints and wire waste
The manufacturing dimensions of carton joints are determined according to the number of corrugated layers and the level of production technology. Single corrugated cardboard is 35 ~ 40mm, double corrugated cardboard is 45 ~ 50mm, and triple corrugated cardboard is 35 ~ 40mm. Corrugated cardboard is 50mm.
When calculating the expanded area of ??the carton, the loss of waste wire during the manufacturing process must be taken into account. The size of the waste wire is determined based on the number of cardboard layers, generally 20 ~ 40mm.
In order to facilitate the calculation in actual work, the rule of adding "8" and "4" is uniformly adopted, that is, the sum of joints and waste wire in the transverse direction is set to 8cm, and the total wire waste in the longitudinal direction is is 4cm.
1. Calculation formula for flat box area
Through the above introduction, the area calculation of flat box can be expressed by the following two formulas:
Single carton area S = [(length + width) × 2+8] × (width + height + 4)
Double carton area S= [(length + width + 8) × 2] 4)
Note: The units of length, width, height, 8 and 4 here are all cm.
Expansion area of ??cartons with full upper cover and lower sockets
Cartons with full upper cover and lower sockets are generally smaller in size. Some are made of corrugated cardboard, and some are only made of corrugated cardboard. Produced with single-layer coated white cardboard, such as outer small packaging of medicines, food, and cosmetics.
Cut length and tile height
In the corrugated box manufacturing process, it is particularly important to clearly distinguish the concepts of cut length and tile height. Once a mistake is made, the strength of the cartons will be greatly different, which will cause all the produced cartons to be scrapped, causing huge losses.
The cut length refers to the length perpendicular to the corrugated direction; the tile height refers to the length along the corrugated direction.
Joints and wire waste
The joint size is determined based on the number of carton layers. The joints of three-layer boxes are generally 3cm, and the joints of five-layer boxes are generally 4cm. The size of the waste yarn is uniformly calculated as 2cm.
2. Calculation formula for area of ??cartons with full upper cover and lower socket
Cutting length: L= (length + width) × 2+ joint + waste wire
Watt height: H= 1/2 width + socket + height + width + waste wire
Area S= L × H
Note: Generally, the area of ??the carton is calculated with reference to the actual object After unfolding the cartons, a specific dimensional analysis is made based on the specific shapes of different cartons. The length, width, and height are all fixed through precise measurements. The size of the joints and waste wires have a certain degree of flexibility depending on the situation.
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