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Design and printing, mainly printing

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posters and single pages are flat and should be cut

coke cans and toothpaste bottles are three-dimensional shapes, which are not printed directly on the cans, but printed on the cans with a special material (water mark)

explanation of water mark: if you use a paper with a layer of glue on the surface (not PVC), it will stick to your hand

print the pattern on this kind of paper. After printing and soaking in water for 1-3 minutes, the pattern printed on the paper will be naturally separated from the paper and pasted on the product with the separated pattern. Then it can be tested after oil injection, drying and so on
this is a method I know. (it doesn’t matter if the water mark can be made a little smaller than the finished product, because the water mark is elastic and the pattern is not easy to deform after being pasted. It’s not good to make it bigger)

this method should be used for some bottles, cans and helmets

another way is to print it on plastic paper (the material on the mineral water bottle, but much thinner than that) and paste it with clouds. (I haven’t touched this method, I’m not sure, it’s purely speculative)

my friend, I appreciate your spirit of seeking truth ~ ~
according to my understanding, the bleeding of curved surface printing is precisely to avoid cutting. It is meaningful to avoid bleeding. Because the bottom color of the soda tank is usually color rather than white, it will be difficult to see the white edge or error. The background color of toothpaste packaging is usually white
to sum up, bleeding has different meanings in various situations. The bleeding of the printing plane is to facilitate cutting, and the bleeding of the printing surface is to avoid cutting.

My God, Comrade Chen Xiaoni, your answer is too professional, isn’t it? People ask about bleeding, not about the size of the paper in the design. I think adding bleeding when printing the can body is mainly considered in two aspects: first, the flower paper is formed and pasted behind the can, which should be reduced after being baked in the flower baking oven (I have made glass bottles, and I don’t know if this is the same reason for the pop can); Second, there is no blank bottom for the tank (that is, the spare part of pure aluminum). I don’t know whether this answer is reasonable or not, for reference.

there are a lot of printed materials in Baidu’s PP forum. There are many friends who do packaging and printing

my answer may be unprofessional, because I haven’t done canned printing, but I guess you may bleed during plate making:
when printing, it’s possible that the cans can’t just be within the accurate picture and text range every time, so do some bleeding to prevent too many defective products

1. Coke cans are printed before making cans, just like canned Wang Laoji, but Wang Laoji uses tinplate and coke uses aluminum
2. If it is a glass screen, curved surface printing is generally used, that is, commonly used screen printing.

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