Optimized color carton printing process technology (on)

With the continuous prosperity of the commodity economy, the packaging of products has become more and more sophisticated. Colored corrugated boxes have become more and more popular among merchants. The share of color cartons (including color boxes) in the market has also increased, and the quality of cartons has been controlled. Also very much concerned by businesses. To improve the quality of colored corrugated boxes has become one of the important management contents that cannot be ignored in the production process control of cartons. Throughout the production process of color corrugated cartons, the main links affecting the print quality of cartons are: production process plan, plate production, quality of base paper, ink deployment, equipment adjustment, operation technology, staff quality, etc. Therefore, we must focus on the production Careful control and control of all aspects can improve the printing quality of color carton products and meet customer requirements.

To correctly choose the printing production process plan

In the process of order receipt and process layout, color carton products should first consider what kind of production process to use and can better ensure the product's printing quality. According to the characteristics of the manuscript to determine the prepress plate and the process of production process, which should be considered factors include: printing plate production process, the characteristics of the original paper, ink performance, production process, equipment types. The production process shows that the correct setting of the color carton printing process plan is the key link to determine the production efficiency and product printing quality, and is also the source of product quality control. Choosing the right printing process is also effective in preventing the occurrence of printing defects and reducing the reliability of printing raw and auxiliary materials. Therefore, for the finer color carton layout, consider using a preprinting process for printing. Among them, the lithographic pre-printing process is simple and fast, and it can print a simple layout, but also can print a fine cable screen version, the cost is lower, and it is more suitable for printing production with a quantity below 100,000 sheets. Although the flexo process is relatively easy to make, it is suitable for printing general color cartons because the resin plate material is relatively expensive and the dot reproduction and overlay accuracy is inferior to the lithography process. The cost of plate making is high. The gravure preprinting process is more complicated in plate making, and the platemaking cost is also the highest one. However, the printing plate has a higher printing rate, and is more ideal for the printing of thick and fine color carton face paper, and is suitable for relatively fixed layouts. , preprinted production of a long line of color cartons. For products with a small number of production, simple layout, and not very high quality requirements, flexographic printing slotting machines can be considered to complete the direct printing of corrugated cardboard at one time. Choosing a color carton printing process scheme requires starting from the factory conditions and considering the performance and quality requirements of the products. It is necessary to start from reducing the production cost and reducing the production cost, and consider how to shorten the production cycle. Meeting the urgent needs of customers is an important principle.

Control of printing plate production technology

The technical control of the printing plate production process of the color carton is of great significance to ensure the printing production efficiency and the quality of the product. In the printing process, from the ink quality to the product print definition; from the printing rate to the layout overprint accuracy, all involve the technical control of the printing plate production. For example, in the case of flexographic production, when the layout has both small text versions, textured prints, and field or large-area line versions, the printing quality and printing are enhanced to ensure the production of field, line, text, and cable versions. The printing rate of the printing plate can be divided into two layouts for the large-area field, line version and anilox version in the same color layout, respectively, for exposure and rinsing, so that the printing plate production quality and printing rate can be better The improvement. In this way, plate making can also take advantage of the flexibility of the multi-color printing unit, using two color groups to print large areas of the field version, line version and text version, textured version, so that the field version, line version to maintain a thick, shiny The printing ink layer, but the text version, reticulation layout can get the appropriate amount of ink coating, can effectively avoid the emergence of paste problems. In addition, in the printing operation, we should pay attention to check whether the printing plate is flat, vacuum suction gas leakage phenomenon; according to the layout structure, the characteristics of the plate to determine the exposure time, if necessary, can be a sample printing test; for small lines The resin version of the outlets should pay attention to the control of the development time of the washing plates, and prevent the lines from being deformed due to over-washing and the appearance of bad spots.

Color Carton Printing Process Technology Control

Pay attention to the control of temperature and humidity in the printing environment

Color cartons are generally overprinted with more than 4 colors, and the horizontal orientation of the tissues is most likely to occur due to changes in the temperature and humidity of the environment, resulting in failure of overprinting. Controlling the temperature and humidity of the printing shop is an important part of improving the overprint accuracy of color carton products. Therefore, whether it is a flexo printing process, offset printing or gravure printing production workshop, the temperature and humidity at the production site must be relatively stable and balanced. In the printing process, there can be no obvious disparity between the levels, so as to avoid the defects of overprinting. The printing process practice shows that the temperature of the printing production workshop is generally controlled at about 22°C, the humidity should be maintained at about 60%, and paper and paperboard are not prone to deformation, which is more effective for better assurance of accurate overprinting of products.

Loading process technology control

The production process of preprinting carton paper with an offset printing press is very important. Because the PS plate is thinner, the total thickness of the photosensitive layer and the plate base is about 0.3mm, and the plate base and material of the aluminum plate have relatively brittle characteristics. Care must be taken in the plate loading process. Attention should be paid when avoiding the plate layout. Scratched by the parts on the machine; the school version should pay attention to grasp the appropriate degree of force, to prevent excessive force and make the plate appear tensile deformation, resulting in product overprinting is not allowed and India rate decline. The flexographic plate should pay attention to one-time alignment of the platen position to avoid repeated plate disassembly and deformation of the plate and affect the fastness of the plate. When the temperature is particularly high, high-quality double-sided adhesive should be considered to prevent the printing plate from malfunctioning during the printing process. The high-quality double-sided adhesive tape should have strong viscosity, good flatness, uniform thickness, and good temperature resistance, and can ensure the stability of viscosity in high and low temperature operating environments. When the plate is removed, no residual adhesive is left on the plate and plate rollers.

Offset ink balance control

The control of ink balance is a crucial technical link in the offset printing process. When the printing of the tissue paper is often under control of the ink and ink balance, there are no shortages of conditions affecting the quality of the ink. Therefore, a small amount of fountain solution should be used in the printing process. The supply volume is ideal for printing under the condition of keeping the ink and ink balance, and the balance method of “great ink and large water” should not be used for printing. The key to ink balance control is to require the ink to maintain good cleanliness and reasonable fluidity. It is necessary to use as little or no driers as possible to prevent the crusting phenomenon of early drying of the ink; the printing shop should pay attention to dust and powder protection. It is necessary to avoid mixing old and new inks; fountain solution PH value should be controlled properly, water quality should be kept clean; rubber rollers and water rollers must maintain good accuracy and appropriate hardness; printing speed should be kept moderate and constant, these are to achieve the ink Balanced technical essentials and effective guarantee conditions.

Offset printing color arrangement control

The printing of colored cartons generally uses a multi-color printing machine to complete the printing at a time. When printing, the ink is instantaneously completed with “wet and wet” overprinting and overprinting, and the time for laminating between the colors is quite short, so the printing color sequence It should be reasonably determined based on many factors such as layout structure, ink properties and paper properties. In general, the arrangement of printing color sequence should be based on the actual situation as appropriate, such as the printing area and the small amount of ink before the printing, layout and ink after the large amount of printing; poor transparency of the ink first printing, transparency, good ink after printing Viscosity of the ink is printed first, followed by ink with low viscosity; ink with slow drying is printed first, and ink with fast drying speed is printed. Considering the lightfastness of inks, the lightfastness of yellow and magenta is poor, and printing should be considered first. The lightfastness of blue and black can be better followed by printing. When the material surface strength, gloss, ink absorption, moisture content and pH, there are differences, in order to prevent off powder, pull hair, sticky dirty, overprinting is not allowed and dry bad and other ills, to the normal printing obstacles, color Ordering arrangements should be considered in terms of paper characteristics. For paper with good paper gloss and high tightness, for example, dark colors should be printed first, followed by printed light colors. On the contrary, if the texture of the paper surface is rough and loose, the dark color should be printed first.