The manufacturing dimension of carton packaging is the blanking dimension during box making, and the manufacturing dimension is measured by the pressing line on the unfolded box blank. The indentation roller on the slitter presses out a groove at the line pressing position. The line pressing is the middle line of the groove, and the distance between the two lines is the manufacturing size. There is a quick method to convert manufacturing dimensions into internal and external dimensions, but they also have their own measurement methods.

纸箱包装在制造过程中有单拼和双拼之分：单拼即一页成型箱，一般用于周长较小的产品；双拼也称为二页箱，有的产品周长太大，需要用两片箱坯拼接一个，但有时厂家为了利用生产过程中裁切下来的余料，也会用两片拼接一个尺寸不算太大的纸箱，有时也会用四片拼接。二页箱与一页箱相比，多了一个接头，因此两者的面积计算有一些细微的差别。

Carton packaging can be divided into single splicing and double splicing in the manufacturing process: single splicing is a one page shaped box, which is generally used for products with small circumference; Double splicing is also known as two page box. Some products have too large circumference and need to use two pieces of box blank to splice one. However, sometimes in order to make use of the surplus materials cut down in the production process, the manufacturer will also use two pieces to splice a carton with not too large size, and sometimes four pieces to splice. Compared with one page box, two page box has one more joint, so there are some slight differences in the area calculation between the two.

产品接头的制造尺寸根据瓦楞层数和生产工艺水平确定，单瓦楞纸板为35—40mm，双瓦楞纸板为45—50mm，三瓦楞纸板为50mm。

The manufacturing size of the product joint is determined according to the number of corrugated layers and the production process level. The single corrugated board is 35-40mm, the double corrugated board is 45-50mm and the three corrugated board is 50mm.

计算纸箱包装展开面积时需要考虑到制造过程中回丝的损耗，回丝的尺寸需要根据纸板的层数来确定，一般来说是20—40mm。在实际工作中，为了方便计算，我们统一采取加“8”加“4”的规则，也就是将横向接头和回丝的总和定为8cm，纵向回丝总合定为4cm，二者相加，就是所需计算的总尺寸。

When calculating the unfolded area of carton packaging, the loss of return wire in the manufacturing process needs to be considered. The size of return wire needs to be determined according to the number of layers of cardboard, generally 20-40mm. In practical work, in order to facilitate calculation, we uniformly adopt the rule of adding "8" and "4", that is, the sum of transverse joint and return wire is set as 8cm and the sum of longitudinal return wire is set as 4cm. The sum of the two is the total size to be calculated.

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