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.

紙箱包裝在制造過程中有單拼和雙拼之分：單拼即一頁成型箱，一般用于周長較小的產品；雙拼也稱為二頁箱，有的產品周長太大，需要用兩片箱坯拼接一個，但有時廠家為了利用生產過程中裁切下來的余料，也會用兩片拼接一個尺寸不算太大的紙箱，有時也會用四片拼接。二頁箱與一頁箱相比，多了一個接頭，因此兩者的面積計算有一些細微的差別。

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.

產品接頭的制造尺寸根據瓦楞層數和生產工藝水平確定，單瓦楞紙板為35—40mm，雙瓦楞紙板為45—50mm，三瓦楞紙板為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.

計算紙箱包裝展開面積時需要考慮到制造過程中回絲的損耗，回絲的尺寸需要根據紙板的層數來確定，一般來說是20—40mm。在實際工作中，為了方便計算，我們統一采取加“8”加“4”的規則，也就是將橫向接頭和回絲的總和定為8cm，縱向回絲總合定為4cm，二者相加，就是所需計算的總尺寸。

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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