With the development of social economy and the improvement of national living standards, people pay more and more attention to the perfection of commodity packaging. Corrugated carton packaging accounts for an increasing proportion of the entire article packaging industry due to its unique functions, and the most critical technology of corrugated carton is water-ink printing. This article talks about my experience on how to use equipment improvement to improve the quality of ink printing.

First, the processing of printing white

Printing whiteness is the most common and most difficult quality problem in the production of corrugated cardboard boxes. The causes are: poor ink absorption of paper; dirty printing plate; paper dust and dust on cardboard. The traditional way to deal with these problems is to manually change the box, or increase the frequency of manual wiping. These methods will play a certain role objectively, but the improvement effect after changing the box is not large, and it is easy to cause a decline in efficiency; wiping the plate will also cause waste of water, electricity, and labor.

After long-term observation and analysis, the author believes that in the process of equipment installation, maintenance and management, the key to solving printing dew is dust removal. The main source of dust is generated when the paper is separated by a single knife. Based on this situation, I installed an electrostatic air suction and dust suction device after the computer cross cutter of the cardboard production line and the paper feed section of the printing machine two years ago. Use a hair dryer before the cutter to blow out or blow away the paper scraps hidden in the pits when the single-piece knife is split, and then use an electrostatic air suction and dust suction device to suck the paper scraps at the paper receiving rack behind the computer cross cutter go. At the gap between the paper feed rubber ring and paper feed roller of the paper feed section of the printing press, electrostatic dust is used to suck the dust from the cardboard to keep the printing surface clean and dust-free. Under such conditions, when the cardboard enters the printing roller, ink is applied Barrier-free, even ink absorption. After such improvement, the printing effect of the product has been greatly improved, and the phenomenon of printing whiteness caused by dust has been fundamentally overcome.

2. Handling of overprinting

Nowadays, product packaging pays more and more attention to the artistic and three-dimensional sense of patterns, so that consumers can feel the perfection of the purchased products from the outer packaging. To achieve this goal, packaging printing must use multi-color printing, that is, multi-color overprinting.

In the process of overprinting, there is often a misalignment between the latter color and the previous color or the positioning position, so that the printed pattern cannot reflect the design effect of the product packaging, or even completely different, completely destroying the image of the product.

In response to this particular problem, after a period of in-depth investigation and research, the author ’s company conducted a detailed calculation of the electrical control response speed to the mechanical fit tolerance accuracy, made several improvements to the existing equipment, and formulated relevant Equipment maintenance measures.

1. Improve the accuracy of the phase positioning of the printing cylinder

The phase positioning of the printing cylinder is controlled by the cooperation of the encoder and the counter. If the precision of the counter is too low, the position of the encoder will be inaccurate and the position will be shifted during printing. The general c ounter reflects a speed of 3K, but it often produces an error of ± 1mm ​​during positioning. After discussing with Taiwan's electric control company, a counter of 5K is produced, which reduces the positioning error of the printing cylinder to ± 0.4mm.

2. Timing lubrication, testing transmission machinery

In the paper feeding process, if the transmission machinery cannot maintain a good and stable operation, the position of the cardboard will change every time, resulting in printing and sleeve positioning, so it is very important to carry out correct maintenance and inspection of the equipment. . It is possible to formulate a daily operation checklist before starting the work, including lubrication maintenance. At the same time, the limits of the amount of wear of the paper feed wheel and paper feed ring are formulated. If they are not qualified, they must be refurbished, re-coated or replaced to overcome the phenomenon of cardboard displacement and skew during walking.

3. Use suction to feed paper

The traditional printing machine adopts the upper printing, and only the paper feed wheel can be used to convey the cardboard, while the new printing machine adopts the advanced technology of lower printing and upper suction to convey the cardboard. The suction paper feed uses the wind force to attract the paperboard to the conveying wheel. Its suction force is uniform, not in the position or in the oblique position, and the curved paperboard is sucked flat, aligned during printing, and the ink is more uniform and flat.

Third, the treatment of poor printing ink

Poor inking, in addition to paper and offset problems, there are also technical problems with the inking roller on the device.

The anilox rollers are all made of anilox rollers. In high-standard carton printing, anilox rollers of more than 250 lpi are used. The mesh holes are most likely to be clogged with ink residues, resulting in uneven ink application, insufficient ink volume, light ink, etc. phenomenon. The traditional method is to use clean water to clean the ink roller. No matter the method of water scrubbing the ink roller or detergent scrubbing, the effect is not ideal. A new ink roller is less than a month old, and the effect is obviously not as good as before.

Through long-term exploration and testing, the company where the author works believes that the following methods can effectively solve the problem of poor printing ink.

1. Add a filter in the ink tank to prevent the ink particles from being transferred to the ink roller.

2. Regularly (usually half a month) use anilox roller deep cleaning agent to perform circular cleaning.

3. Clean the ink roller with dripping water every day after work and dialyze the mesh of the ink roller with a magnifying glass of 60 times to 100 times. There should be no residue of ink residue. If local residues of ink residue should be wiped off immediately with a deep cleaning agent.

Through the maintenance of the above points, the inking effect of the inking roller can always be kept good.

The above-mentioned printing technical problems are very important to the quality of carton products in actual production. Through the understanding and improvement of equipment and good maintenance, we can produce products that satisfy our customers and improve the comprehensive benefits of the enterprise.

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