Management and control of finished product size of

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Management and control of the finished product size of corrugated boxes

release date: Source: China paper industry

the main purpose of corrugated boxes is packaging, which is not worth the loss, but if there is a size deviation in the carton, it is equivalent to making a fatal mistake. Many people in the industry will think that the size management and control of cartons is the most basic and simplest, but as users of corrugated cartons, they often don't think so. The size problem directly determines the value of cartons. Customers will accept it only if the size is appropriate. If the size is not appropriate, no matter how well other projects are done, it will not help. But to really manage and control the size of cartons is a very systematic work. Therefore, it is the most economical and scientific management to do simple things right at once

good size is the "cornerstone"

the size of corrugated boxes has three forms: external size, manufacturing size and internal size. These three forms are all composed of the length, width and height of the carton. Therefore, the specific expression is divided into external width and height, internal length and width and height, and manufacturing length, width and height. The external dimension refers to the volume measured from the outside of the corrugated box, which is generally used as the basis for calculating the freight and the mark on the outside of the box. The inner dimension refers to the surface to surface distance measured from the inside after the corrugated box is supported and formed. The inner dimension is determined according to the volume of the contents. Generally, the inner dimension is slightly larger than the volume of the contents. The manufacturing dimension refers to the production process dimension converted according to the inner dimension of the carton. Generally, the production operation is carried out by placing an order and adjusting the pressing line according to the manufacturing dimension

external dimension, internal dimension The relationship among the three manufacturing dimensions: (taking the 0201 carton as an example)

external dimension length (width) = internal dimension length (width) + corrugated board thickness * corrugated board layers (2 layers)

external dimension height = internal dimension height + corrugated board thickness * corrugated board layers (including 4 layers of internal and external flap)

manufacturing dimension length (width) = internal dimension length (width) +Corrugated board thickness ÷ 2 * layers of corrugated board

manufacturing dimension height = internal dimension height + corrugated board thickness ÷ 2 * layers of corrugated board

there is another comprehensive dimension in the national standard. The comprehensive dimension of the carton is the sum of the length, width and height of the inner dimension of the carton. Among the above three sizes, the manufacturing size is relatively flexible. According to an ambitious plan, Cedric Kennedy, a student of Michigan tech, stepped into the field of 3D printing. The thickness of the same corrugated board, different pressing and forming equipment and different forming processes change at any time. Therefore, after continuous experiments and repeated process improvements, mastering the manufacturing size is the first step to control the size of the carton. The same is true for special-shaped cartons. No matter how many layers of corrugated cardboard there are, the inner dimension must be added to the total thickness of these corrugated cardboard to be the outer dimension of the carton

scientific design is the "prevention needle"

to design the size of corrugated box, we must first design the internal size. Because the internal size is relatively easy to determine, it is determined by the external size of the physical measurement or physical combination and arrangement calculation of the internal goods. The discharge of internal contents should save space as much as possible and reasonably consider the factors of supporting force. From the perspective of mechanics, if the contents share a branch support force, the requirements for the compression resistance index of the carton can be appropriately reduced. Therefore, it means the reduction of costs and the acquisition of profits. If the contents are cartons, the direction of the strands of the cartons should be considered, because the longitudinal strands have better support than the transverse strands

during the forming process of corrugated box, the corrugated board should be pressed to make the corrugated board bend well. At the same time, the pressing will damage the structure of corrugated board, shrink the inner paper and extend the face paper. Its expansion and contraction is directly related to the thickness of the paperboard and the way of pressing the line. The thicker the paperboard, the greater the expansion value, the wider the pressing line, and the greater the expansion value. However, whether it is a corrugated box formed by two-wire, three wire or five wire pressing method, the protruding part of the bottom line of the pressing wheel will squeeze the compressed part of the corrugated board into the center of the corrugated board. Therefore, the inner dimension of the corrugated box is slightly shorter than the distance between the line and the pressing line when the corrugated box is unfolded. In this way, the shortened part of the size should be added as the correction value, which is closely related to the thickness of corrugated board

in order to protect the contents of the most common cartons, the outer swing covers are usually butt sealed. This requires that the size of the flap of the carton must be calculated accurately, and there must be no gap after docking, nor can the flap be superimposed. In principle, the theoretical value of the manufacturing dimension of the swing cover width should be half of the manufacturing dimension of the box width. However, since the inner and outer swing covers are on the same pressure line, the inner swing cover will have a supporting effect on the outer swing cover after folding, and the outer swing cover will inevitably produce a certain gap at the butt joint. Therefore, it is very important to calculate the correction value of the manufacturing dimension of the outer swing cover width. This correction value is generally half of the thickness of the pressed paperboard, but the expansion and contraction of the paperboard surface and lining caused by different pressing equipment are different, so it is best to determine it through actual measurement

in a word, in the structural design of corrugated boxes, it should be determined according to the manufacturing equipment and different production processes used, as well as the types and properties of corrugated boards composed of different corrugated types and goods inside. Only after mastering all the contents related to the structure and size of designed corrugated boxes can corrugated boxes that protect goods and beautify goods be manufactured

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