The hottest micro corrugated emerging new corrugat

2022-08-01
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Micro corrugated board has been regarded as the mainstream of corrugated board packaging material market in the future, because it has the double effects of better physical properties and printing quality of corrugated board and cardboard. Taking the European and American markets as an example, enterprises in the United States, Sweden, Germany and other countries have expanded the traditional a, B, C, e and other corrugated types to f (0.75mm high), G (0.50mm high), n (0.46mm high) and O (0.30mm high). The total output value accounts for about 8% of the corrugated board. The micro corrugated board will gradually replace the hard board, such as parcel boxes, frozen food boxes and heavy industrial boxes. In particular, the cartons of more than 400g/m2 will be replaced by the ultra-thin corrugated board. It can be said that on the color box packaging of small household appliances, hardware tools, computer software, household utensils, toys, fast food, etc., micro corrugated design will set off a boom. At present, it is a trend to use micro corrugated board to replace e-corrugated paper with color printing. A large number of packaging users use cardboard for packing, while many large companies have begun to use g-corrugated board for packing. According to relevant data, the ultra-thin corrugated board market will grow at an astonishing rate of 20% every year

advantages of micro corrugation

good bursting and flexing properties

micro corrugation is the most refined corrugation in production at present. The potential advantages of this corrugation used in packaging are excellent bursting and flexing properties, light weight and thin board. With the change of market demand, it will have a greater and greater impact on the packaging field

excellent stacking strength and pad protection for commodities

micro corrugated has excellent stacking strength and pad protection for commodities, and can print high-quality and luxurious patterns. In Europe, micro corrugated cartons have largely replaced general packaging cartons and cartons, and are widely used in the packaging of household goods, computers, electrical products, clothing, toys, washing and cosmetics

corrugated is smooth and has better printability

the remarkable feature of micro corrugated is that it is smoother than E-type corrugated and has better printability and good processing performance. In carton processing, it is not necessary to replace the original drum die-cutting machine for processing paperboard, and it can even be processed on the flat die-cutting machine. Due to the low gram weight of micro corrugated board, the material cost also decreases. In addition, it has the above excellent performance, and its market competitiveness is also favored by insiders

offset printing process of micro corrugated paperboard

select a printing machine that meets the offset printing process of micro corrugated paperboard

as the interlayer support point of micro corrugated paperboard is corrugated, it is easy to be compressed and deformed, resulting in the variation of printing points, so it is required to control the printing pressure very accurately during printing. Too much printing pressure, corrugating deformation and dot expansion; The printing pressure is small, the dot transfer is incomplete or the dot is weak, and the final printing restoration effect is poor. Therefore, the correct selection of the machine is particularly critical. At present, KBA rapida sheet fed offset press and RLV offset press can meet this requirement in the market

select a special blanket suitable for micro corrugated board printing

due to the particularity of micro corrugated board material, a special air cushion blanket with high elasticity and ink transfer performance is used in the development of direct offset printing of micro corrugated board. With the help of the good pressure bearing performance of the rubber blanket, it can slow down the sharp increase in pressure during printing at the high-pressure warning line of the State Council No. 46 civilization to ensure the combustion performance of thermal insulation materials, so as to minimize the pressure deformation of the micro corrugated board and maximize the reduction effect of the printing plate. The specific requirements for blanket are as follows:

? Selection of hardness: the hardness of blanket is the key to the integrity of printing point transfer. High hardness, easy to wear the printing plate, but the point transfer is clear; Low hardness, easy to deform

? Small compression deformation: in the process of high-speed printing, the blanket is subject to long-term periodic compression deformation, resulting in compression fatigue, which will cause permanent deformation for a long time, reducing the thickness, elasticity and hardness of the blanket

? Good ink transfer performance: as the intermediate carrier of point transfer, the blanket must have good ink adsorption capacity, ink transfer performance and strong water repellency. Surface oil resistance and solvent resistance: the surface adhesive layer of the rubber blanket must have good oil resistance and solvent resistance to prevent expansion and point deformation due to contact with chemicals in the printing process

? Appropriate elongation: the rubber cloth backing fabric shall be fine and uniform, smooth and firm, with small expansion rate, good overlapping and bonding performance with the inner adhesive layer, not easy to split, and the vertical and horizontal directions shall be absolutely vertical. In this way, the rubber blanket is easy to be stretched, the adhesive layer is thinned and the elasticity is reduced during the printing process, which will cause point expansion deformation and inaccurate overprint. After many tests, the special air cushion blanket that can meet the correct transfer of corrugated board offset printing points can be used

control of ink water balance during printing

the emulsification rate of ink shall be strictly controlled during printing. The control of "washing board" in printing is the control of the combination point of ink water balance and printing pressure during offset printing, and the control of the best point for controlling the thickness consistency and moisture content of micro corrugated board. The control of ink and water balance in printing is very important. It directly affects the printing quality and appearance quality of printed matter. Water ink balance during printing is the process of water emulsifying in the ink, and the amount of fountain solution used in micro corrugated offset printing is less than that used in normal offset printing. Because the addition of water will cause the problem of "washing board" after micro corrugated board printing, it is also crucial to control the ink emulsification rate during printing

select the ink that meets the requirements of abrasion resistance, high fluidity and high tinting force

due to the ridge shape of the surface of the micro corrugated board, the colored surface is uneven. Therefore, if the ink is selected incorrectly during printing, the ink points above the corrugated peak will be completely restored, while the points at the peak and valley will only contact the surface of the substrate. Therefore, if you want to avoid bright and dark spots, you must ensure that the ink can be completely transferred even in incomplete contact. Therefore, we should choose more flexible ink to meet this requirement

select the micro corrugated board material that meets the printing requirements

the micro corrugated board is mainly defined by two parameters - the height of the corrugated board (expressed in inches or millimeters) and the distance between the corrugated boards (expressed in the number of corrugated boards per foot or meter). For example, the thickness of F-type corrugated board is 0.75mm, and there are 420 corrugations per meter. At present, there are E-type, F-type, n-type and O-type micro corrugated

in direct offset printing, the material selection of corrugated paper is another important factor affecting the printing quality. Because there is water printing, it is necessary to select high-quality corrugated raw materials, otherwise the corrugated board will soften and cannot be printed accurately

raw materials of corrugated paper can be roughly divided into two categories: primary fiber paper and secondary fiber paper (recycled paper). Therefore, in order to ensure the printing quality, corrugated board made of primary fiber paper should be selected

micro corrugated board has large plastic deformation after being pressed. How to reduce the plastic deformation during printing is very important. Practice has proved that when horizontal wire corrugated board is used for printing, it is difficult to print because the corrugated direction is consistent with the pressure of the printing line; When the straight wire corrugated board is used, the corrugated direction and the pressure direction of the printing line are crisscrossed, which disperses the pressure of the printing line. The plastic deformation of the corrugated board is greatly reduced, and there is no corrugated collapse, and the printing point transfer performance is good. Therefore, straight wire micro corrugated board is selected as the printing material for offset printing

the uniformity of the thickness of the micro corrugated board is another requirement of the high-grade color micro corrugated board for direct offset printing. Because the thickness of the micro corrugated board is inconsistent, the change of the printing pressure will lead to the variation of the starting point

reprinted from: Global corrugated industry

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