What are the common types of packaging printing?

Printing is the most basic and crucial processing technology in packaging and decoration. Designers carefully design and arrange various elements of packaging visual communication design, but these designs must be realized through printing technology and a large number of copies can be completed to truly reproduce the design effect and face consumers, achieving a "dialogue" between products and consumers. ”. There are many methods of packaging printing, and each method will produce different printing effects. Packaging printing methods are mainly divided into four categories: letterpress printing, offset printing, gravure printing and stencil printing.

Letterpress printing works on a principle similar to that of a seal. The convex printing surface is coated with ink and then pressed against the substrate to create a printing effect. Letterpress printing includes movable type printing and flexographic printing. Movable type printing was developed from early clay movable type, woodcut movable type and lead cast movable type. In modern times, lead type is mostly used for typesetting. However, due to the low efficiency of typesetting and the high cost of graphic platemaking, with the development of digital platemaking technology, this printing method has gradually withdrawn from the packaging printing market.

There is no difference in height between the printing part and the non-printing part of the lithographic printing plate, and they are flat. When printing, the principle that water and oil do not mix is used to form a grease-rich oil film on the printed part, while the non-printed part can absorb moisture appropriately. After adding ink to the layout, the printed part absorbs the ink, while the non-printed part absorbs moisture, forming an ink-resistant effect, thereby creating a printing effect. Lithographic printing developed from early lithography. Plate making and printing have unique characteristics, simple operation and low cost, so it has become the most widely used printing method today. Modern lithography transfers the image from a printing plate to a blanket and then to paper, hence the name offset printing.

Gravure printing is the opposite of letterpress printing. The inked part of the printing plate has obvious depressions, while the non-printed part is smooth. When printing, the ink is rolled on the surface of the page and naturally falls into the recessed printed part. Then the ink on the surface is wiped clean. Finally, the paper is placed on it and greater pressure is used to imprint the recessed printed ink on the paper. , forming a printing effect. Gravure printing directly imprints the ink contained in the gravure pits onto the substrate. It is known for its thick ink layer, bright colors, high saturation, high printing plate durability, stable print quality, and fast printing speed. Advantages, it occupies an extremely important position in the fields of printing, packaging and graphic publishing.

Before computer printers were widely used, people used steel needles to engrave words on wax paper to make plates, and used ink rollers to press the wax plates. The ink carved out the graphics and text through the steel needles and printed them on the paper to form stencil printing. The biggest features of stencil printing are fast printing speed and low cost. It is suitable for large-scale printing of simple graphics, such as posters, advertisements, leaflets, etc.

Generally speaking, in packaging printing, different printing methods have their own advantages and scope of application. Designers need to choose the most suitable printing method based on product attributes, target users, printing effect requirements and other factors to achieve the best packaging design effect. At the same time, during the printing process, attention needs to be paid to the selection and processing of printing materials, inks, printing plate production, etc. to ensure printing quality and efficiency.

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