How to choose the roller?PVC bag welding machine

　　1, according to the printing plate mesh line number selection

　　To ensure the accurate reproduction of the dot of each tone level of the printing plate, each dot on the printing plate must be accurately inked. To this end, the opening area of the roller should be smaller than the dot area, so that there can be one or several inking holes, so that the dot will not fall into the mesh, so that the printing dot will expand.

　　2. Choose according to the graphic structure

　　For the same mesh engraving process, the higher the number of lines, the less ink transfer, more suitable for printing outlets and small text; The lower the number of network cables, the more ink transfer, more suitable for printing large color blocks and bold characters.

　　3, according to the substrate selection

　　When the substrate surface is rough and the printing ink transfer amount is large, it is necessary to use a small number of network lines. On the contrary, the substrate with a smooth printing surface must use a mesh roller with a large number of network cables and a small amount of ink transfer.

　　4, according to the different degree of wear choose the roller: when the ink hole volume of the roller is reduced by half, it should be replaced with a new one.

　　5, select the roller according to different ink delivery devices

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