Printing a lot of printed plastic packaging materials, letterpress, gravure, screen, offset printing is widely used in plastic packaging.
Toppan Printing
Toppan Printing is mainly in the plastic packaging flexographic printing more applications, primarily printed plastic film. Letterpress printing plates printed portion thereof is higher than the blank portion, and all parts are printed on the same plane, while printing, the printed portion coated with the ink, because a blank portion is lower than the printing portion, the adhesion of the ink Chung, then printing was in contact with the plate, and to a certain pressure, the transfer printing portion of the printing plate to the substrate to obtain a printed product. Since the blank portion is concave, so that when pressing on a blank part of print slightly raised, forming a printed product. Letterpress printing surface has unevenness inconspicuous, which is a relief print characteristics. Flexographic relief printing is the main force, widely used in newspapers, books, packaging and showed growing trend, such as carton printing, packaging printing, plastic printing, foil printing, napkins, toilet paper, facial tissue and printing.
Gravure
Gravure advantage is the high print quality, bright colors, solid ink, clear picture level, high resistance to Indian forces, but the high cost of the plate, long cycle. Gravure is also called intaglio. Graphic part of the intaglio blank section below. Depression related degree with hierarchical image, that image is darker, deeper depth, printing, layout first applied ink, ink Daogua go on a blank part of the layout of the ink, the ink only remains in the depressed graphic section, and then under the pressure of the printing ink is transferred to the substrate to obtain prints. Since the recessed different shades, so the amount of ink is different, the printing ink thickness is not the same. Ink many places it is concentrated color, light color inks few places, thereby reproducing tonal gradation images.
Gravure is widely used in large quantities of printed pieces, such as paper packaging, magazines, newspapers, plastic packaging, as well as securities, stamps and so on. Gravure because the color saturation, rich image gradation, printed on the packaging account for a large market share.
screen printing
Characterized by a screen printing ink layer thickness, the type of multiple substrates. Substrate material can be a variety of materials can also be a variety of shapes, now widely used in the printing of metal plates, plastic, fabric, particularly in the high-grade gold and silver ink printed on the packaging. The stencil printing plates, printed in part by the different sizes of the same size but holes or mesh composed of varying amounts, holes can pass through ink, blank part impervious ink. When printing, ink printing through the holes or mesh stencil printing onto paper or other substrates to form a printed product. Finished ink jet printing of relatively thick, greater than the amount of ink gravure printing. Screen printing is the main form of stencil printing. Its plate by the screen (nylon net, polyester mesh, wire mesh) and the frame components. Screen tight on the frame, by the mesh screen printing ink leakage when printing graphics.
Lithographic
Offset printing is mainly coated paper, offset paper, wrapping paper color graphics board products mainly include calendars, product advertising, catalogs, books and other high-end printing products. Pure plastic packaging basically do not use offset printing, but paper-plastic composite board has adopted offset. Lithography (mainly offset printing) on a blank part of the layout of the printed portion and no significant high and low points, almost in the same plane. Print portion having oleophilic photosensitive means or by transferring mode; blank having a hydrophilic portion by chemical treatment. When printing, the use of oil-water repulsion principle, first of all in the layout on the water, so that blank portions absorb water, and then further transfer the ink on the plate so that the graphic part of the ink adhesion, and then a blank part due to adsorbed water, not ink absorption and substrates and printed direct or indirect contact, ink is transferred onto a substrate.
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