It turns out that this is how milk cartons are printed & packaged

27-03-2024

Lift the "Veil"

Rich and fragrant milk needs to be stored in a well-sealed 

milk carton to perfectly retain the fragrance of the milk. 

In order to ensure sealing, the milk carton has four "veils" 

covering each other. The outermost is the printed layer, 

the middle is the cardboard layer and the aluminum foil layer, 

and a layer of plastic film that is tightly adhered to the aluminum foil

 layer for complete sealing. There is also another saying that it is

 a seven-layer structure, including the adhesive layer between the layers.

quanhua gable top box

Printed version

The printing cylinder is a fixed device. For Gable Top packaging that 

needs to be printed, workers take the printing plates of each color and 

stick them on the printing cylinder.

milk box roof box

First printed color 

juice packaging roof box

The color comes out of the second printing.

quanhua gable top box

Check under strobe light

When the printing equipment is running at full speed, it is invisible to 

the naked eye.In order to better observe the printing effect, a strobe 

light is needed. Fix the time interval between lighting and let the page 

stay on one printing screen, so that youcan clearly see the effect of 

multiple printings and detect whether there is any printing distortion.

 The small color blocks on the packaging box are used by printers to 

check whether there is overlap or offset. Rumors that the combination 

of color blocks represent different additives can be denied. This color 

block on the milk carton is used for photoelectric positioning to monitor 

the printing effect in real time.

milk box roof box

Printed layer

A design worth mentioning in particular is the outermost "veil" of 

the milk carton - the printed layer. For this kind of large-volume 

outer packaging printing, if the factory prints all the colors at one time,

it will have high requirements on the printing equipment. So I adopted

a very cost-effective and convenient method - multi-color overprinting.

 Using the original equipment, a different printing plate is used for each 

printing, and only one color is printed at a time. The superposition of 

different colors can generate more colors, and up to 6 printings can 

meet all color requirements.


After printing and die cutting, the products will be inspected unqualified 

ones will be rejected.

juice packaging roof box

Paste box

After the die-cut products are glued into boxes, a milk box is born.

quanhua gable top box


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