Home Uncategorized What printing technology is used for cans (aluminum cans, iron cans, etc.)?

What printing technology is used for cans (aluminum cans, iron cans, etc.)?

by admin

(mainly explain the ink and printing model)

metal printing

metal printing is generally used for metal packaging, such as milk powder cans, air fresheners, battery shells, beverage cans, etc. There are mainly silk screen printing, offset printing and other forms, especially in the high fidelity field of offset printing, its printing quality can be comparable to that of paper printing. Universal printer can support direct printing on any plane object and cylindrical object

its printing materials mainly include tin plate, tin or free steel, zinc iron plate, black steel plate, aluminum plate, aluminum stamping container and aluminum and white iron sheet composite materials

extended data

in 1940, beer in stainless steel cans began to be sold in Europe and America. At the same time, the emergence of aluminum cans also became a leap in can making technology. In 1963, the can was invented in the United States. It inherited the modeling design characteristics of the previous can shape and designed an easy pull ring on the top. This is a revolution of opening mode, which has brought great convenience and enjoyment to people, so it has been widely used soon

by 1980, almost all European and American markets adopted this aluminum can as the packaging form of beer and carbonated drinks. With the progress of design and production technology, aluminum cans tend to be lightweight, from the initial 60g to about 21 ~ 15g in 1970

reference source: Baidu Encyclopedia – cans

reference source: Baidu Encyclopedia – metal printing

metal printing refers to the process of printing and polishing the designed layout on the surface of the metal plate or metal molding after determining the specification of the metal plate or metal molding. The production of metal cans can be printed before processing, or processed before printing. Therefore, the printing method of metal cans varies with the printing materials, tank style and substrate shape. Metal is an inelastic material. Although it is coated on its surface, it still can not fundamentally improve its full contact performance with the printing plate, and the image transmission effect is not good. In order to improve the transfer performance of ink, no matter which printing method is selected, there is a common principle, that is, the printing plate or indirect printing plate in direct contact with the metal surface should have flexibility to make up for the deficiency of rigid metal materials in printing suitability, so as to ensure the transfer of oil and ink. Therefore, the commonly used metal printing methods mainly include lithographic offset printing, gravure offset printing, relief offset printing and screen printing. The offset roller of lithography and the thick ink layer of screen printing are conducive to the transfer of ink, while both gravure and relief plates are hard plates, which is not conducive to the transfer of ink. Therefore, the problem of ink transfer can be solved by adding a rubber cylinder between the printing plate cylinder and the substrate. Therefore, this kind of printing method with rubber drum is called gravure offset printing and relief offset printing

printing of metal cans. Printing after metal forming does not have absolute adaptability, but only for metal cans with regular shape and large production quantity. Regular shape mainly refers to cylindrical metal cans, such as beer and beverage cans, and the packaging is the most typical representative. Different from the metal plate printing, the metal can printing processing is completed by the automatic production line, in which the coating and printing belong to the components of this production line. Generally, the internal coating is completed before forming, while the external coating and printing are carried out after forming. Assembly line production generally has high speed requirements, so the offset printing method of relief plate (metal relief plate or flexible plate) is mostly adopted, and the printing color is 4-color machine as the standard model. The working principle of four-color relief offset press is shown in Figure 3. The cylindrical metal can is smoothly transported to the assembly line through the rotation of the star wheel; The printing plate is relief plate, and there are 4 rollers, which can realize four-color printing; The ink on the relief plate is first transferred to the rubber drum, and then transferred to the surface of the metal can by the rubber drum; After printing, there is a polishing treatment on the surface of the tank, which can improve the fastness of the ink and the gloss of the tank surface. Through the device in Figure 3, the surface printing and polishing of the metal can are completed, and the finished metal can is output. 3) Post press polishing. Whether it is metal plate printing or metal molding printing,

the process of printing a layer of varnish on its surface after printing is called glazing. The bright brightness of the color can be increased, the luster of the metal surface can be improved, and the strength of the ink film can be increased, so as to improve the value of the commodity itself. The polishing equipment is similar to the coater (see Figure 3). After metal printing, the polishing unit applies varnish to the surface of the metal tank. Therefore, the post printing polishing process is also called post coating

there are two types of varnish commonly used in glazing, one is organic solvent varnish and the other is water-based varnish. The former can meet the coating requirements in terms of brightness, beauty and firmness, but this kind of varnish takes aromatic hydrocarbons as the main solvent J, which is highly volatile, flammable and explosive, has certain toxicity and poor environmental protection. Therefore, it is not suitable for use in food packaging, drug packaging and beverage packaging, and its application is greatly restricted. The water-based varnish uses water to replace or partially replace the organic solvent, and adds certain additives and connecting materials, so that it not only has the basic properties of varnish, but also has the characteristics of cleaning, non-toxic, environmental protection and baking resistance. The use of water-based cover varnish broadens the application field of metal printing, increases the development potential of metal can packaging, creates more business opportunities and promotes the development of metal printing

the substrate of metal printing is different from paper. The weight and thickness of metal itself restrict the printing efficiency and quality. Therefore, efforts should be made in the aspects of material supply, transmission and automatic control in the renewal and design of equipment

(1) magnetic intelligent gripper transmission device, double diameter embossing drum and transmission drum can be adopted to prolong the handover time of gripper, ensure accurate transmission of printing sheets at high speed and ensure smooth passage of printing sheets

(2) the functions of automatic feeding, full-automatic rapid plate change, rapid ink change, automatic clutch of ink roller, automatic plate washing and automatic setting of printing sheet size should be introduced into the equipment to improve the automation of metal printing equipment

(3) adopt print quality control and modular open system, automatically set and control ink volume and water volume, correctly adjust printing pressure, realize circumferential, horizontal and diagonal registration adjustment, and improve multi-color registration accuracy and stability

the completion of metal surface printing is only half of the work for metal can processing. Printing and can forming are equally important in reflecting the value of metal packaging. The shape of metal can largely depends on the mold style and the conditions of stamping equipment. At present, the development and use of metal can forming equipment in China and even in the world are only limited
to cylinder and cube, which are mainly used in cans, raw material barrels, food boxes and so on. Occasionally, some special-shaped tanks appear, which often limits large-scale production due to their small application area, small processing quantity and high design and processing cost. This phenomenon greatly restricts the diversified development of can shape, making many products unwilling to set foot in metal packaging due to the single shape of metal can. Fashion products such as candy, chocolate, coffee, decorations, cosmetics and jewelry are actually very suitable for metal packaging. With the exquisite metal printing and the exquisite shape of metal box, it is undoubtedly a wonderful match with the contents. However, such commodities have high requirements for the shape, appearance and durability of packaging boxes. The current types of metal boxes are difficult to meet the packaging requirements of such products. In view of this situation, if more styles of metal cans can be designed and matched with corresponding forming and processing equipment, so as to develop more kinds of metal cans, it will fundamentally promote the development of metal printing and make metal can packaging have greater market prospects

compared with general paper packaging and plastic packaging, metal cans have the characteristics of good shape retention, strong durability and strong decoration. For ordinary consumers, people are used to the reuse of metal can packaging whose external shape is not easy to be damaged. Metal packaging such as moon cake box and jewelry box is very suitable for reuse such as fruit tray and sundry box. The use of old things saves resources greatly, which is consistent with the idea of energy-saving society advocated today. However, there is a prerequisite for the reuse of such metal cans, that is, when using inner products, the outer metal packaging should be kept intact. As a metal packaging enterprise, this problem should be taken into account when processing metal cans. For those metal can products that damage the packaging during use, such as cans, we should try our best to use easily recycled metal and environmental friendly printing ink as processing materials. Generally speaking, metals are recyclable, but printing brings some obstacles to the recycling of metal cans. The coatings and inks used in printing can only be removed by special methods such as high temperature and chemical reaction after metal recovery, which brings difficulties to metal reprocessing. At the same time, in the process of treatment, the resistance of some metals is not as good as the coating layer, resulting in no recycling value of metal cans at all. Therefore, in order to improve the reuse rate of metal cans, we should make more efforts to improve the reusability and recycling processing of metal cans.

three piece tin cans are generally offset printing, and two piece aluminum cans are generally flexographic printing.

normal aluminum two-piece can printing (commonly known as pop can printing) is different from ordinary plane printing. It is a method of printing on an arc-shaped metal surface. It is generally classified as continuous high-speed curved surface printing, which is a special printing technology. Generally, offset printing is that the picture and text area and non picture and text area on the plate are on the same plane, and the smooth printing can only be achieved by adding the repulsion of water and oil for fountain printing. The printing method of cans is dry offset printing, which uses letterpress instead of lithography without fountain water. It is transferred from letterpress to blanket (commonly known as printing felt) and then to the substrate – cans.

cans are printed with curved surface or lithography

different printing methods: one is to listen to the cans and then print them; the other is to print them before making cans

curved surface printing: the method of can making before printing, also known as dry offset printing, is to print with four-color plate (yellow, red, blue and black) and ordinary metal processing ink. The tin printing uses the dot plate for color overprint, places the colors to be printed on the rubber cloth in turn, and then transfers various colors to the tin in turn through the runner

lithography: before printing, the iron sheet shall be cleaned with acid solution, and then coated with a layer of antirust paint for printing. After printing, it shall be processed for can making

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