Discussion on the effect of gravure printing instead of screen printing to achieve fission (wrinkle)

As a kind of surface finishing effect, fission (wrinkle) is widely used in high-grade packaging. In the past, we usually used the screen printing process to achieve fission (wrinkle) effect, but screen printing often has some problems in the production process, such as high mesh consumption; Due to the different local tension during printing , it is easy to cause a single small set to be inaccurate. When the imposition layout is large, the local ink layer is not thick enough; the production speed is 2500 sheets/hour, the speed is slow and the efficiency is low; the paper is mainly delivered by hand, and the labor intensity is large. And it is easy to produce a paper delivery inverted, and the rejection rate is high. The gravure printing process has the advantages of accurate overprinting and high efficiency, and has high practical value.

The gravure process is used instead of the screen printing process to achieve the fission (wrinkle) effect, which can greatly improve the mass production efficiency and product quality stability, save production costs, and reduce labor and resource waste. Below, the author will introduce in detail the specific technical requirements for the effect of gravure instead of screen printing to achieve fission (wrinkle).

Testing and setting of gravure plate parameters

In order to achieve the fission (wrinkle) effect of screen printing 250 by gravure printing, it is necessary to test the gravure plate making parameters.

Test 1: Test of the shape of the cell

Intaglio printing was performed using two engraving processes, electronic engraving and laser engraving, to test the fission (wrinkle) printing effect of gravures of different cell shapes, and to compare with the effect of screen printing fission (wrinkle) to finally determine the gravure plate making process and the cell shape. The gravure cell shapes of laser engraving and electronic engraving are shown in Figures 1 and 2, respectively.

According to the shape of the cell and its ink storage amount and the actual test printing effect, the laser engraving process is finally selected to produce the intaglio plate.

Test 2: Test of cell depth

On the basis of Test 1, after determining the gravure plate making process and the shape of the cell, the cells of different depths are tested, and the nearest or most similar mesh-like fission (wrinkle) effect is selected for in-depth correction until reaching Screen printing effect requirements.

The printing depth of the 35μm, 40μm, 45μm, 50μm, 55μm cell is tested, and compared with the fission (wrinkle) effect of the screen printing 250, the depth of the cell closest to the effect is selected, and the intaglio is made after fine adjustment.

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