The paper opening technique of the processing of the tote bag, because the printing sheet has a width of about 1 cm, the edge of the mouth is not printed, and the ruled line, color code, etc. are required in addition to the finished product range, so for the general printing, the paper is first cut. It is larger than the finished product. When it is printed, it can be cut off by the paper cutter or die-cutting machine.
        If the indentation processing of the portable paper bag is to replace the indentation line with thick cardboard, the die cutting and the indentation are not suitable at the same time, so the portable paper bag is generally only subjected to the indentation processing without the die cutting process.
        If the edge of the paper is cut with a paper cutter before the indentation, the positioning accuracy of the indentation will be affected. If the cutting is left after molding, the paper is not easily cut due to deformation of the paper during molding. Therefore, the commonly used method is to cut the paper into the unfolded size of the finished product before printing, and only perform the indentation processing after printing, and no need to cut or die-cut.

       Rectangular portable paper bags with length, width and height are a, b and c respectively. The finished product sizes a, b, c and the finished product dimensions A and B have the following conversion relationship: the length after expansion is A=2*(a+ b) + side sticking, width after expansion B = discount + h + bottom, wherein the side stick is generally 2cm, and the fold is generally 5cm.