Large discussion on technology related to cardboard digital printing
Digital packaging printing is mainly used in the sample market, testing samples, sales samples, improved packaging, product distribution, packaging with different printing data, and product sales packaging in different regions.
Digital printing can save the expenses of waste products, logistics groups and inventory, and can provide merchants with quick samples, sales products, market test products or product issuance of trademarks or packaging, which saves 20% and 90% of the time compared with general printing. Digital printing can also provide packaging drawings for businesses in advance, and can provide personalized packaging printing services for small shopping malls and personal stores. For example, coffee shops, cigarette shops, pharmacies and other special shops can use digital printing to design their own unique packaging.
In the label printing market, digital printing has a certain market position. However, in the corrugated packaging market, digital printing has just begun, and packaging and comics printing that are easily deformed are gradually maturing. In addition, compared with digital label printing, the application of digital packaging printing has not yet developed today, but its development prospects are beyond doubt.
Despite the limitations of digital packaging printing, its advantages and prospects are certain. This article will discuss some related technologies of cardboard digital printing.
1 Digital packaging printing concept Digital packaging printing has two interpretations: (1) A digital printing is used to print flexible packaging, comics, corrugated boxes and labels. This printing technology directly uses electronic files to generate graphics on the impression cylinder. This computer direct printing process omits the traditional film, plate and streamline printing processes; (2) Digital packaging printing is composed of digital workflows, which omits the steps between traditional printing and concept and printing. The digital printing mentioned here is to produce a new graphic or non-contact printing (N IP) on each impression cylinder.
The field of digital printing is very broad. If the materials allow, then all product packaging can use digital printing. However, when compared with general printing methods, digital printing has limitations due to lower productivity and high consumption in all aspects. For example, the printing of photosensitive substrates such as plastics can cause problems during printing. In addition, when users want to print on cardboard with a certain quality, its limitations are also reflected in the maximum load of the printer on the cardboard. At present, the maximum load of digital printing is 350g / m 2, but it should be noted that thickness and quality are not the same problem. Generally, cardboard is thicker and harder than paper.
2 Printing performance of cardboard In order to successfully complete packaging printing, it is very important for all types of paper printing to meet the basic paper walking standard. When digitally printing paperboards (solid bleached paperboard SBB, high whiteness kraft paper, paper and liquid packaging paperboard LPB), how to improve the paper feedability becomes the key.
In the printing process, it is very important to determine the critical paper feedability factor through the observation of the operator. In the printing process of digital printing presses, the performance of paper feeding, transmission and paper feeding must be judged by a certain level standard. In order to observe the possible damage and influence, the factors that need to be tested are thickness, curvature, surface roughness, tension and resistance. In addition, humidity loss, curling, or unevenness are also factors that affect print quality.
In digital printing on cardboard, the three most important factors affecting its printing quality are curling, bending and unevenness of the cardboard. The curling of the cardboard can cause paper feeding problems and enhance the curvature or unevenness of the cardboard, thereby causing performance problems of the product. Paper transport and transport problems in cardboard transport systems are all caused by curling, unevenness, unsuitable thickness, and unsuitable print sizes of cardboard. Moreover, curling and unevenness are usually caused by printing conditions of the printing machine, such as unevenness of printing and uneven exposure of the photosensitive layer.
The consistency of paper cutting and paper feeding of the paper feeding unit is another problem of web printing. The uneven cardboard structure and machine pressure affect the problems of cardboard curling, unevenness and cutting. When the photosensitive bottom layer is exposed to high temperature, or due to the influence of different melting techniques, different degrees of humidity loss will occur, and curling and unevenness will occur, so the operator needs to pay more attention. When the bending toughness of the cardboard decreases, make sure that the reduction is small. However, the dry and liquid toner technology does not have the problem of curvature, unless it is printed on roll paper or sheet paper. In general, whether a sheet-fed printing press has good paper feedability, an appropriate level of flatness and acceptable flatness, and a suitable size of the printed photosensitive base layer, these properties can be achieved by adjustment.
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