What are the printing methods of plastic packaging bag
s? Plastic printing includes gravure printing, letterpress printing, screen printing, flexographic packaging printing, indirect gravure printing and composite packaging printing according to the structure and method of the plate. (1) Gravure printing is mainly used for packaging and printing plastic films, which are used to manufacture various types of plastic packaging bags. Gravure printing, referred to as gravure printing, is a type of packaging printing method among the four major packaging printing methods. Gravure printing is a type of direct packaging printing method, which directly presses the printing ink contained in the gravure dent onto the substrate. The depth of the printed image is determined by the size and depth of the dent. If the dent is deep, it contains more printing ink, and the ink layer left on the substrate after pressing is thicker; on the other hand, if the dent is shallower, the amount of printing ink contained is less, and the printing ink is left on the substrate after pressing. The ink layer that comes down is thinner. The printing plate of gravure printing is composed of dents and the surface layer of the printing plate corresponding to the paper manuscript image one after another. When packaging and printing, the printing ink is filled into the dents, and the printing ink on the surface layer of the printing plate is scraped off with an ink scraper. There is a certain pressure contact between the printing plate and the substrate, and the printing ink in the dent is transferred to the substrate. , complete the packaging printing. Gravure printing is a type of printing technology, because of its advantages such as thick ink layer, bright colors, high color saturation, high printing plate durability, relatively stable quality of printed products, and fast packaging and printing speed. It occupies a very important leading position in the publishing industry. (2) Letterpress printing is mainly flexographic packaging printing. The flexographic packaging printing plate uses a photosensitive resin material plate as the plate material, which is fixed on the printing plate cylinder with adjustable and repeatable size. Ink delivery is controlled by another ink roller or ink scraper. Flexographic packaging printing is to transfer liquid or grease printing ink to various printing materials. It can print up to 12 colors at a time, and it is easy to use. It is a new type of packaging printing method developed in the plastic printing industry. Flexographic packaging printing still belongs to the scope of letterpress printing, but because its printing plate, oil and printing process are different from traditional letterpress printing, it has extensive adaptability to substrates, and the cost of packaging and printing is cheap. , And has excellent packaging and printing effects, widely applicable to various types of plastic packaging bags, flexible packaging, composite packaging and so on. (3) Screen printing Screen printing is mainly used to package and print plastic films and various containers that have been extruded, and it can also print transfer materials to transfer text on special-shaped plastic products. Screen printing refers to the use of screen mesh as the plate base, and the use of light induction printing plate making method to make a screen printing plate containing text and graphics. Screen printing consists of five basic elements, screen printing plate, squeegee, printing ink, packaging printing table and its substrate. Part of the mesh of the screen printing plate can pass the printing ink, and some meshes of the non-text can not pass the printing ink to complete the packaging printing. When packaging and printing, pour the printing ink on one side of the screen printing plate, use a scraper to add a certain pressure to the printing ink position on the screen printing plate, and at the same time move toward the other end of the screen printing plate at a uniform speed, and the printing ink is moved during the movement. The squeegee is extruded from the mesh of a part of the text to the substrate (4) Special packaging printing Special packaging printing is other packaging printing that is different from traditional packaging printing methods, including inkjet packaging printing, gold and silver ink packaging printing, bar code printing Packaging and printing, liquid crystal packaging and printing, magnetic packaging and printing, pearlescent packaging and printing, hot stamping anodized aluminum, etc. Comparison of printing effects 1. Compared with several printing methods of gravure printing, gravure printing is the most effective method. At the same time, because of its fast printing speed, it is also widely used in the printing of composite packaging bags. One of the disadvantages is that one printing The price of the version is relatively high, generally ranging from 500 to 2000. Gravure printing effect: 2. Letterpress printing Letterpress printing is mainly used in the field of plastic packaging bags for punching bags, vest bags, shopping bags and other products, and most of them only print one or two colors. Letterpress printing: professional custom packaging bag plastic bag/non-woven bag PE/PO/PP/CPE/PPE/OPP/PVC/EVA scan QR code for consultation
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