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What are the characteristics of the printing technology of plastic packaging

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there are many printing methods for plastic packaging materials, including relief printing, gravure printing, screen printing and lithography

I. relief printing

in relief printing, flexo is widely used in plastic packaging printing, and the important thing is to print plastic film

for the printing plate of relief printing, the printing department is higher than the vacant department, and all printing departments are on the same plane. During printing, ink is applied to the printing department. Because the vacant department is lower than the printing department, the ink is gushed and adhered, and then the substrate is at war with the printing plate with positive pressure, Make the printing department on the printing plate transfer to the substrate to obtain printed products. Since the vacant part is concave, the vacant part on the printed matter is slightly raised when pressurized to form a printed product. The appearance of relief printing has no significant unevenness, which is the characteristic of relief printing

flexo is the main force of letterpress printing, which is widely used in newspapers, volumes and packaging, and shows a continuous growth trend, such as carton printing, packaging paperboard printing, plastic printing, foil printing, napkin, toilet paper, facial tissue paper printing, etc

II. Intaglio printing

intaglio printing has the advantages of high printing quality, beautiful color, rich ink layer, clear picture and high printing resistance, but it has high cost and long cycle

gravure printing is also called engraved gravure printing. The graphic Department of gravure is lower than the vacant department. The depression level is related to the organization of the image, that is, the darker the image, the deeper its depth. During printing, the layout is first coated with ink, and the ink of the vacant Department on the layout is scraped off with an ink knife, so that the ink is only stored in the concave graphic and graphic department, and then the ink is transferred to the substrate under the action of printing pressure to obtain the print. Due to the difference of concave depth, the amount of ink is different, and the ink thickness on the printed matter is different. Where there is more ink, the color is thick, and where there is less ink, the color is light, so as to reproduce the tonal organization of the image

Gravure printing is widely used for mass printing, such as paper packaging, magazines, newspapers, plastic packaging, securities, stamps, etc. Gravure printing occupies a large market share in packaging and printing because of its high color saturation and rich image organization

III. screen printing

screen printing is characterized by thick ink layer and many types of substrates. The substrate can be made of various materials or shapes. It is now widely used in the printing of metal plates, plastics and fabrics, especially gold, silver and ink on advanced packaging

on the printing plate of hole plate printing, the printing department is composed of holes of different sizes or meshes of the same size but different numbers. The holes can pass through the ink, while the vacant department cannot pass through the ink. During printing, ink is printed on paper or other substrate through holes, hole plate printing or mesh to form printed products

the ink amount of products printed by hole printing is rich, which is greater than that printed by intaglio printing. Screen printing is an important method of hole printing. The printing plate is composed of wire mesh (nylon mesh, polyester mesh, metal mesh) and mesh frame. The screen is tight on the screen frame. During printing, pictures and texts are printed by ink leakage from the mesh of the screen

IV. lithography

offset printing is important for printing color pictures and texts on coated paper, offset paper and packaging board. The important products include wall calendar, product advertisement, picture album, books and periodicals and other advanced prints. Offset printing is not accepted for pure plastic packaging, but offset printing is accepted for paper-plastic composite paperboard

there is no significant difference between the printing department and the vacant department in lithography (mainly offset printing), which is almost on the same plane. The printing department is lipophilic by photosensitive method or transfer method; The vacant department is hydrophilic through chemical disposal punishment. When printing, the principle of oil-water repulsion is used. First, water is applied to the layout to make the vacant Department absorb water, and then the ink is notified to the plate to make the graphic Department attach ink. Because the space-time shortage Department has absorbed water, it cannot absorb ink, and then the substrate and the printing plate fight directly or indirectly, and the ink is transferred to the substrate

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