Three-folding is an important graphic and text propaganda material, which is widely used in various activities and occasions because of its large amount of information and easy transmission. Understanding and mastering the design and printing process of three folds is a necessary skill for designers. In this article, I will take a three-folder with a size of 420x285mm as an example to explain how to handle the 3mm bleed design and how to handle the printed crease.

A trifold is a leaflet consisting of a single sheet of paper bundled into three parts along a predetermined crease. Each divider should be one-third of the original paper. However, let's not forget that we also have a 3mm bleed area in the design process. Bleeding area is a part of the area reserved by designers to prevent white edges from appearing on the edges of the design document due to cutting errors.

Therefore, for example, a three-fold with a size of 420 x 285 mm, the total size is 420 3mm×2 ( left and right sides) = 426 mm. However, not every side is 426/3=142mm in size. Since 3 mm of bleeding is added on the left and right sides, the total width is actually (3mm 140mm) 140mm(140mm+3mm)=426mm,The size of the printed area on one side shall be 140mm. At the same time, important design elements and information should be placed in the safe area when designing manuscripts to prevent them from being cut by mistake.

Once the three-fold design is complete, it will be printed and folded according to the preset crease. However, it is worth mentioning that because of the paper material and thickness and other factors, printing plants in the actual operation, there may be a slight deviation. Therefore, when designing, designers should try to foresee some possible problems, rationally set the bleeding area and safety area, in order to ensure the aesthetic and overall effect of the finished product.

During the printing process, the creases are placed in advance to ensure that each crease is positioned precisely and neatly. In this way, not only the neatness and beauty of the final product can be ensured, but also the error caused by manual operation can be avoided.

All in all, the detailed steps for designing and printing a 420×285mm tri-fold with 3mm bleeding included a lot of detail. It is only in-depth understanding of every detail that can ensure that the finaltrifoldIt can meet the design expectation and achieve the ideal effect. Therefore, good design is not only art design skills, more is the whole design and printing process understanding and grasp.

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