The characteristics and process of packaging gravure printing

The characteristics and process of packaging gravure printing
The packaging bag printing process is simple, which makes the gravure printing process the fastest and best printing process among all printing processes. Kraft paper bags can be printed at the fastest speed. The stable running printing machine can print very wide-format bags. The gravure printing process is less affected by non-working downtime, and produces less loss than the offset printing process. The advantages of fast printing speed, wide printing width and less downtime make the production efficiency of the gravure printing plate cylinder relatively high, and the production cost of the gravure printing plate cylinder is not so tight in the long version printing.
 　　The advantages of the gravure printing process for packaging bags are mainly due to the following points;
 　　 1. Rotary gravure printing is the fastest in all printing processes;
 　　 2. Higher productivity and lower waste;
 　 　3. The color printing has excellent equivalence, and the design of the gravure printing machine can avoid mechanical failures;
 　 　4. Rotary gravure printing is especially suitable for the printing of face tones and skin colors;
 　　 5. Different cells with different engraving depths can be obtained to change the thickness of the ink film and enhance the image contrast.
　　  6. ​​The thick ink film makes the image have high color strength, opacity, beautiful color and high gloss.

Different types of packaging bags have different printing methods. The gravure printing process of transparent plastic films used in color printing packaging bags and film-coated non-woven bags is as follows:
1. Overall analysis. Place the colored graphics and text on a white background. White can be achieved by white background. Color needs to be hollowed out. Printing with spot colors can make the process easier. If the text and line content in the graphic is large, the number of screen lines can be lower.
2. Make and color-separate plates before printing. The color-separated plate-making requires a white plate to be used as a primer and the corresponding color plate. This work can be carried out in the electronic engraving system, or it can be designed in the pre-press design system, and then the printing plate can be directly engraved on the electronic engraving machine. Specific operation method:
First, make the pattern of a single packaging bag, enter text according to the size of each element, and draw color blocks and lines. Set the corresponding color. After making it, check the size, position, and text to make sure that there are no errors, then proceed with the layout work.
Considering the width of the bag, the width of the printer and the width of the plastic film, calculate how many bags can be printed in the width direction. According to the diameter of the plate cylinder, several bags can be placed in the circumferential direction of the plate. Note that the width of the sticky edge should be left between the bag and the bag.
Next, carry out engraving and plate making on the electronic engraving machine. At the same time, prepare the metal version. It should be noted that if it is printed on the inside, the graphics and text on the printing plate are just the opposite of the surface printing.
3. Start printing. Printing on a unit-type plastic film printing machine, the specific steps are plate loading, squeegee, ink preparation, roll up, ink test, adjustment, and formal printing.
4. Laminating. It is carried out on a dedicated laminating machine.
5. Bag making. Bag making is actually bonding. Two layers of films are bonded to form a three-sided sealed plastic bag and cut into a single bag.
The process of plastic bag printing seems simple but considers the manufacturer's production technology. The quality of plastic bags is not only reflected in the material itself, but the quality of the printing is equally important.