The hottest talk about the development of corrugat

2022-08-16
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On the development of corrugated box flexographic printing machine

after more than 30 years of research and improvement and strong market demand, corrugated board flexographic printing machine has made considerable progress so far. Problems such as unstable paper feeding, large registration error, difficult machine adjustment, ink scraping and dust have been greatly improved. The degree of improvement can be analyzed by the structure of the following unit units:

(I) paper feeding part: it is emphasized to focus on finding out from the supply side, and focus on using the traditional waste plastics in the market to make 3D printing materials. Is the quality reliable? The paper feeding unit is a push back type, which is often unable to feed due to the bending of the paperboard, and the paper feeding cannot ensure the positioning of the paperboard, resulting in tens of millions of registration errors. The improved small-area adsorption plate or roller assisted by vacuum adsorption can improve the above shortcomings, but it will still cause deviation for large-area paperboard due to insufficient contact area. Aiming at these shortcomings, Martian company of France has developed a large-area adsorption contact vacuum adsorption belt type paper feeding system, which can completely solve these problems and ensure the registration accuracy of leading-edge paper feeding

(II) paper powder fine removal device: the problem of paper powder puzzles the quality of corrugated brush together. The initial method is to remove it by brush and dust suction, but the effect is not obvious, mainly because the dust often has static electricity and is firmly attached to the cardboard. Nowadays, models with high printing quality requirements are equipped with high-voltage discharge dust devices, which remove static electricity first and then dust to improve the dust removal effect

(III) paperboard transmission: traditional printing machines operate with paper pulling rings between printing units. The positions of the paper pulling rings need to be adjusted according to different widths, and the printing parts must be avoided to avoid scratching the printing ink. In addition, its periodic transmission action will affect the registration accuracy due to the different bending degree of the paperboard. Therefore, the Swiss boster company has developed a vacuum adsorption transmission system, which transports the paperboard in the form of vacuum adsorption and roller. The paperboard can be horizontally absorbed on the machine and stably transmitted in the printing unit, and there is no periodic jumping between units, which greatly improves the printing registration accuracy, and there is no need to adjust the position of the pull ring due to the replacement order

(IV) printing ink supply system: due to the successful introduction of ceramic roller, the flexographic press can also be equipped with single-chip scraper, closed trough scraper and other systems in addition to the traditional rubber ink guide roller. In order to adapt to different ink volume and linear density required by different printing, the flexibility of the printing unit is very important. Some studies consider that the printing unit is equipped with rubber ink guide roller and closed slot scraper system at the same time, and different scrapers can also adapt to full page and dot printing. The Swiss boster company is an electric device for replacing ceramic embossing rollers. Two to three groups of embossing rollers are configured in each printing unit, which can be replaced in one minute. It can be used for a wider range of printing, and can print full page and dot overprint up to 120l/inch

(V) drying unit: in order to adapt to the increasing trend of carton printing color, there are more and more printing units with more than four colors. On this premise, drying device is necessary, which can improve printing quality and production speed. In addition, during line processing, the drying unit can isolate the printing and post-processing (slotted die-cutting) processes, so as to prevent dust from entering the printing unit and vibration from affecting the printing quality. The number and configuration of drying units depend on needs and budgets. Boster's model is designed for multicolor printing and line glazing with the continuous improvement of people's living standards, so hot air drying is configured after each printing unit, and UV drying device is installed in the last unit to coat UV oil

the above is only the basic improvement of the corrugated paperboard flat sheet printing machine. There are other equipment that can be equipped to further improve the printing quality, such as independent motors of each unit, ink monitoring and queuing abnormal devices. Carton manufacturers should choose the most ideal equipment based on the investment budget of the market itself. It can be predicted that the trend of multi-color and high-quality printing of cartons is inevitable. (Yang Changcai, Martian company, France) (excerpted from paper packaging)

flexible packaging requires that one tension machine be multi-purpose

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