The most important use of corrugated boxes is to package items, but if the carton has a dimensional deviation, it is tantamount to making a fatal mistake. Many people in the industry will think that the size management control of the carton is the most basic and simplest, but users of corrugated carton often do not think that the size problem directly determines the value of the carton. Only the right size customers will accept the use. The size is not suitable, no matter how good the other projects are, it will not help. But it is a very systematic job to really manage and control the size of the carton. Therefore, getting the simple things right at once is the most economical and scientific management.


Setting a good size is the "foundation stone"

There are three forms of corrugated box size: outer size, manufacturing size, and inner size. These three forms are composed of the length, width and height of the carton. Therefore, the specific expression is divided into outer length, width and height, inner length, width and height, and manufacturing length, width and height. The external size is the size of the volume measured from the outside of the corrugated carton. It is generally used as the basis for calculating the freight and the label on the outside of the carton. The inner size is the distance from the face to the face measured from the inside after the corrugated carton is formed. The inner size is determined according to the volume of the contents. In general, the inner size is slightly larger than the volume of the contents. The manufacturing size is the production process size converted according to the size of the carton. Generally, the production order is placed according to the manufacturing size and the pressure line is adjusted for production operation.

The relationship between outer size, inner size and manufacturing size: (Take 0201 carton as an example)


Outer dimension length (width) = inner dimension length (width) + thickness of corrugated cardboard * number of layers of corrugated cardboard (2 layers)
Outer dimension height = inner dimension height + corrugated cardboard thickness * the number of layers of corrugated cardboard (including 4 layers of inner and outer swing cover)
Manufacturing size length (width) = inner size length (width) + corrugated cardboard thickness ÷ 2 * the number of layers of corrugated cardboard manufacturing size height = inner size height + corrugated cardboard thickness ÷ 2 * the number of corrugated cardboard layers

There is also a comprehensive size in the national standard. The comprehensive size of the carton is the sum of the length, width and height of the carton. Among the above three sizes, the manufacturing size is relatively flexible, and it changes at any time according to the thickness of different corrugated cardboard, different crimping molding equipment and different molding processes, so mastering the manufacturing size is the first to control the size of the carton step. The same is true for special-shaped carton. No matter how many layers of corrugated cardboard, the inner size must be added to the total thickness of these corrugated cardboard to get the outer size of the carton.

Scientific design is "preventive needle"

The size of the corrugated cardboard box must be designed first. Because the internal size is relatively easy to determine, it is determined by the physical measurement of the internal goods or the external size calculated by the physical combination arrangement. The discharge of the contents should save space as much as possible, and reasonably consider the supporting factors. From a mechanical point of view, if the contents share a part of the supporting force, the requirements on the compression resistance of the carton can be appropriately reduced. Therefore, it means a decrease in costs and a profit. If the content is a carton, consider the direction of the carton's strands, because the longitudinal strands have better support than the horizontal strands.

In the process of forming corrugated cardboard boxes, the corrugated cardboard should be crimped to make the corrugated cardboard bend well. At the same time, the crimping line destroys the structure of the corrugated cardboard and causes the backing paper to shrink and the surface paper to extend. The amount of expansion and contraction is directly related to the thickness of the cardboard and the method of crimping. The thicker the cardboard, the greater the stretch value, and the wider the crimp line, the greater the stretch value. But whether it is a corrugated cardboard box formed by the two-wire, three-wire or five-wire crimping method, the protruding part of the bottom line of the crimping wheel will squeeze the compressed part of the corrugated cardboard into the center of the corrugated cardboard. Therefore, the internal dimensions of the corrugated box are slightly shorter than the distance between the line and the crimping line when the corrugated box is unfolded. In this way, the shortened part of the size should be added as a correction value, which is closely related to the thickness of the corrugated cardboard.

In order to protect the contents of the most common carton, the outer rocker cover is usually butted and sealed. This requires that the dimensions of the carton's rocking lid must be calculated accurately, and there can be no gaps after docking or overlapping of the rocking lids. In principle, the theoretical value of the manufacturing size of the swing cover width should be one-half of the manufacturing size of the box width. However, since the inner and outer rocker covers are on the same pressing line, the inner rocker cover folds to support the outer rocker cover, and the outer rocker cover inevitably generates a certain gap at the joint. Therefore, it is very important to calculate the correction value of the manufacturing size of the outer swing cover width. This correction value is generally half of the thickness of the lined cardboard, but the expansion and contraction of the cardboard surface paper and backing paper caused by different crimping equipment are different, so it is best to determine it by actual measurement.

In short, in the structural design of corrugated boxes, it is necessary to determine the type and nature of the corrugated cardboard and the contents of the different corrugated boards used in the manufacturing equipment and different production processes used, and only master all the design of corrugated boxes. Only after the content related to the structure and size of the product can we manufacture corrugated boxes for protecting and beautifying the products.

Washable Hair Remover

Washable Hair Remover,Portable Hair Cutter,Washable Hair Trimmer,Electric Rechargeable Hair Clipper

Ningbo Beilun Xuanfeng Molding Co., Ltd. , https://www.schelfern.com