Bleed line is a professional term in the printing industry, which refers to the part of printing beyond the center of printing. In the printing industry, since the tools used to cut printed matter are mechanical tools, the cutting position is not very accurate.

In order to solve the problem of unexpected colors appearing on the edges of printed matter due to inaccurate cutting, designers generally add 2~4mm reserved positions for "bleeding" around the cutting position of the picture. Ensure the consistency of the finished product. The design size is always larger than the finished product size, and the larger side needs to be cut off after printing. This part that needs to be printed and cut off is called printing bleed.

A box is a flat piece of paper when printed. To make it into a box after printing, you need to make a flat mold that is the same as the box for stamping. This mold is a printing knife mold, which can usually be Referred to as die or die.

The die drawing is designed and drawn by the designer using AUTOCAD or impact, and then stored in a file format, the equipment can be started for template processing. After completion, the die cutting line is installed to produce the finished die.

For a finished carton, the mold factory will first produce the die drawing, and the graphic designer will design the packaging box based on the die drawing, and add the bleed position during the carton design process.

Extended information:

The printing process includes pre-press, printing, and post-press processing processes. Among the post-press processing processes, one process is die-cutting and indentation. Cutting is to cut the printed matter in folio, quarto or octavo size after printing. Creasing is for thicker paper that needs to be folded. It should be creasing first and then folded.

Traditional knife mold making is to draw on the knife template with a pencil or ballpoint pen, and then saw it through a sawing machine. During the movement, misalignment will occur and errors will occur; the processing speed is slow.

After using a laser cutting machine, the drawing design can be carried out directly on the computer. The knife template is cut and shaped by the laser cutting machine fully automatically, without manual intervention. The error is small and the speed is fast.

Computer equipment and traditional hand-made production, although the computer machete machine cannot fully achieve 100% bending of the doll shape, it has extremely high precision in simple shapes and straight-line cutting with a straight knife. Effectively speed up production efficiency.

Baidu Encyclopedia - Bleeding Line

Baidu Encyclopedia - Knife Mold