Speaking of printed corrugated cardboard boxes, beer packaging is common, so-called "beer cardboard boxes".
The corrugated packaging material used to make the corrugated cardboard box is said to have originated in the United Kingdom in the 19th century, when it was used as a material to absorb sweat from top hats.
Corrugated paper is usually composed of 3 sheets of paper, that is, the general corrugated paper is composed of corrugated corrugated paper core and corrugated liner paper attached to the top and bottom of it.
Corrugations with only one liner are called single-sided corrugations, those with two corrugated paper cores and three corrugated paper cores are called two-layer corrugations and three-layer corrugations, respectively, and they are used according to the strength they bear. There seem to be many people who have recently heard the word C-shaped corrugated.
Corrugated paper is divided into many types according to its different height.
1 Corrugation and its use
In Japan, type A corrugated and type B corrugated are generally used as transport outer packaging boxes. The beer boxes mentioned at the beginning of this article are generally made of B flutes. E-lens are used as single-piece packaging boxes with certain aesthetic requirements and contents of appropriate weight, such as the "Central Festival" in July and the half, the packaging of goods that are not promoted in the year, and the packaging of Christmas cakes. F-type corrugated and G-shaped corrugated are collectively called micro corrugated, is a very thin corrugated, used as a disposable packaging container for hamburgers, cream-filled pastries and other foods, or as micro-electric products such as digital cameras, portable stereos and refrigeration Commodity packaging.
2 Corrugated paper printing
As far as corrugated paper printing is concerned, there is no special printing method, whether it is relief printing, gravure printing or offset printing, it is the main printing method.
1) Letterpress printing (flexo printing)
In the embossing process of the beer box mentioned above, before the corrugated shape is processed in the corrugated shape, it is first sent to a flexo rotary press for printing, and then it is bonded to the corrugated core and another liner to form a corrugated packaging material.
Corrugated paper, whether it is rotary printing or single sheet printing, uses letterpress made of resin material. Flexographic printing using water-based ink can print accurately and at high speed regardless of the smoothness of the liner used to produce corrugated paper, which is a very effective printing method.
In addition, the opacity of flexo ink is good, and it can be printed in bright colors on the kraft base paper used for producing corrugated paper.
In the plate-making process of resin relief plate used in the past, a cleaning process using an organic solvent is indispensable. Recently, some plate materials considering environmental harmony have been adopted from the plate-making process, such as plates that can be used only by washing with water; Plates that can be used after thermal development; plates that use liquid photosensitive materials for UV curing (non-photosensitive liquid recovery and reuse) are all printing methods that incorporate environmental harmony.
However, in Japan, flexo printing has not made much progress in the process of high screen count, and most of the flexo products seen in stores are 80-line products. In Europe and America, especially in Europe, the printing method of corrugated paper material is flexo as the mainstream, and flexo products with 100 to 140 network lines can be seen.
The reason for the flexo printing of high screen lines is that it is vigorously adopting environmentally coordinated processes in Europe, and Japan has high requirements for the reproduction accuracy of printing. Exquisite printing is achieved by offset printing and gravure printing. It is a so-called grainless photo. Reproduce (175Lpi) the result of the consciousness working strongly.
2) Gravure printing
Although it is the same as the "gravure" grarure in the gravure printing method, the paper gravure printing machine is different from the flexible packaging gravure printing machine. It needs to apply a large printing pressure to achieve the transfer of ink. Therefore, the plate cylinder and the impression cylinder are large. Again, it is a printing method for high-volume products.
In addition, since gravure printing is a printing method different from flexo printing, the printed paper must have a good smoothness. Gravure printing with a large amount of ink coating is thick and expressive. Compared with offset printing and flexo printing, it is a printing method highly evaluated in depth printing. In order to respond to environmental measures to limit VOC emissions, it may be necessary to respond to water-based gravure in the future.
3) Lithography
The so-called offset printing is offset printing. Speaking of corrugated offset printing, the past process is generally to first perform offset printing on cardboard, etc., and then attach it to single-sided corrugated paper.
About 10 years ago, due to the widespread adoption of G-shaped corrugations, very thin G-shaped corrugated paper could be printed directly on offset presses. This direct offset printing process can reduce the number of processes compared to the process of printing on cardboard and then laminating with single-sided corrugation, so theoretically it has advantages in delivery time and cost, but the greater advantage lies in G-type corrugation. Offset printing can be carried out directly, which can greatly reduce paper consumption.
The reduction in energy consumption during production becomes a reduction in cost and a reduction in CO2 emissions; the reduction in transportation energy consumption is associated with a reduction in transportation costs and a reduction in CO2 emissions.
A practical example is that products such as digital cameras are often transported by air. Assuming that they are shipped to New York and the packaging is reduced by 10g, the air transportation stage can reduce CO2 emissions by 152.9g.
The extremely thin micro-corrugated packaging, such as G type, has high strength, thin thickness, small volume, and exquisite printing. As a package that corresponds to the environment, it will be more noticeable in the future.
3 Application of heavy content packaging
The typical example of corrugated packaging has been introduced above-beer boxes made of B-type corrugations, and G-type corrugations are being used overseas to make beverage can boxes.
Even the packaging of heavy-weight contents will continue to pursue beautiful and beautiful packaging in harmony with the environment. It can be said that the printing method with wide application range, high popularity and attractive to users will be pursued by people.
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