Due to the rapid development of computer technology, as the darling bar code of the information age, there is a broader prospect. China joined the International EAN Coding Association in 1991 and in the same year promulgated the national standard for barcodes.
Bar codes are usually printed by a computer or printed by different printing methods. As far as the carton industry is concerned, since hand-engraved rubber plates could not replicate bar codes in the past, users often printed bar code labels through other printing methods, and then put them on cartons for circulation. Now, due to the adoption of corrugated board production lines and flexible photosensitive resin printing plates for water-based printing and slotting machines, the flatness of corrugated paperboard, printing plate problems, and printing machinery problems are basically solved, and the necessary preconditions for directly printing bar codes on corrugated cardboard are initially available.
However, feedback from many provinces and cities indicates that most manufacturers' attempts have not achieved the intended purpose. Mainly in the verification of the bar code printed on the corrugated board, the computer misread (Misread) or read (Nonread). This has caused many industry leaders, business leaders, and printers to attach great importance to it.
In fact, barcodes are a very rigorous system. It is not easy to understand it completely. Of course, as a printer, as long as you have some basic knowledge in this area, and reasonable process arrangements. For the flexible printing of corrugated board, a more reasonable process is: bar code original film→plate making→printing proofing→verification→batch printing.
Original film (original film) of the original film barcode is recommended to be provided by the barcode center to ensure sufficient accuracy. The carton industry generally prints the EAM code, which is a kind of multivariate code. If possible, the bar code can be appropriately enlarged in a range of no more than two times to reduce the difficulty of plate making and printing, and the bar code printing quality can be guaranteed.
In the whole process of printing bar codes, the original film is provided and the proofing of small batches is proofed. The help provided by the bar code center is indispensable, and the carton manufacturing plant must do a good job at the same time.
It is not advisable for cartons to make their own films. Although some manufacturers can use Barco\Artpro\CorelDRAW and other software to “generate†barcodes, they often lack the power extensions, laser imagesetters, and barcode verification hardware. There are errors in printing, scanning, multiplexing, and photography. The best thing to do is to use a barcode center because people are professional.
Platemaking with high-quality original film, flexible lithographic printing plate production is not complicated. The film's film surface and the flexible plate should be closely exposed. Before each exposure, the UV film should be cleaned. The ratio of the drug solution should meet the specific gravity requirements. When it is too viscous, the fresh drug solution should be replaced. There are many plate types that can be used. For printers in the field of flexo printing, we recommend using Dupont Cyrel TDR155 and TDR250. For smaller bar codes, DuPont "Silicon" UXL67 or UXL90 can be used as a spacer. The DuPont plate is recommended because, from the published patent specifications, DuPont's formulas are unique. The most notable feature is that when the plate comes in contact with the liquid, the strength of the DuPont plate decreases slightly, while the strength of the plates of other brands decreases, and it is easy to wash out the graphic. If expensive imported plate-making equipment is used, the choice of plates can be appropriately relaxed.
There are many problems in printing and printing. First, because the corrugated board itself is not as smooth as offset paper, the second is the use of dark brown cardboard, kraft paper, third, the domestic water-based ink on the senior sizing paper, poor adhesion fastness, of course, printing technology, The quality of the printers themselves needs to be improved.
Barcode printing thickness difference should be controlled within 0.1mm (refer to blank area and bar printing thickness difference). Since the water-based printing machine uses an anilox roller transfer ink technology, it can meet the above requirements. Corrugated cardboard face paper should use some thick smooth paper to prevent collapse deformation.
Printing barcodes on corrugated cardboard with dark brown cardboard and kraft paper is difficult to read no matter what color is used. Because of the optical properties of bar code reflectivity, reflection density, PCS
Values ​​are regulated. The empty color is too dark and close to the stripe, which will reduce the PCS value and make the barcode difficult to read. In general, the bar color should be dark, and the empty color should be light, avoiding red stripes. Because the bar code scanner light source is typically a He-Ne laser, a semiconductor laser, or an LED, a red light source with a wavelength of 630-780 mm. Red light has the highest reflectance and is white. Therefore, printing a bar code with red color cannot be read and should be noticed.
The safest color for barcodes is black and white. Therefore, it is preferable to use whiteboard as the panel, and the black color is used to satisfy the optical characteristics of the barcode. If you have to print a bar code on dark brown cardboard, there is no good way. Only preprint the white background at the bar code position and then print the black bar color. Corrugated board common face paper and ink with Table 1
It is worth mentioning that the flexographic printing due to the softness of the plate may cause deformation under pressure, resulting in widening of the bar code black bars, and because the bar code direction is at a zero angle with the platen roller axial direction, the blank part of the bar code will be Widening, so the bar code center in the production of flexo bar code film must narrow the bar code, which is different from other printing methods.
How much is it appropriate to narrow (reduce)?
The usual calculation formula is:
Decreased percentage (BWR) = K÷Rх100%
In the formula, R refers to the repeat length, and the K value is a constant of the composition ratio, which is determined by the thickness of the printing plate.
Table 2 shows the different K constants for plates of different thicknesses.
Bar codes are usually printed by a computer or printed by different printing methods. As far as the carton industry is concerned, since hand-engraved rubber plates could not replicate bar codes in the past, users often printed bar code labels through other printing methods, and then put them on cartons for circulation. Now, due to the adoption of corrugated board production lines and flexible photosensitive resin printing plates for water-based printing and slotting machines, the flatness of corrugated paperboard, printing plate problems, and printing machinery problems are basically solved, and the necessary preconditions for directly printing bar codes on corrugated cardboard are initially available.
However, feedback from many provinces and cities indicates that most manufacturers' attempts have not achieved the intended purpose. Mainly in the verification of the bar code printed on the corrugated board, the computer misread (Misread) or read (Nonread). This has caused many industry leaders, business leaders, and printers to attach great importance to it.
In fact, barcodes are a very rigorous system. It is not easy to understand it completely. Of course, as a printer, as long as you have some basic knowledge in this area, and reasonable process arrangements. For the flexible printing of corrugated board, a more reasonable process is: bar code original film→plate making→printing proofing→verification→batch printing.
Original film (original film) of the original film barcode is recommended to be provided by the barcode center to ensure sufficient accuracy. The carton industry generally prints the EAM code, which is a kind of multivariate code. If possible, the bar code can be appropriately enlarged in a range of no more than two times to reduce the difficulty of plate making and printing, and the bar code printing quality can be guaranteed.
In the whole process of printing bar codes, the original film is provided and the proofing of small batches is proofed. The help provided by the bar code center is indispensable, and the carton manufacturing plant must do a good job at the same time.
It is not advisable for cartons to make their own films. Although some manufacturers can use Barco\Artpro\CorelDRAW and other software to “generate†barcodes, they often lack the power extensions, laser imagesetters, and barcode verification hardware. There are errors in printing, scanning, multiplexing, and photography. The best thing to do is to use a barcode center because people are professional.
Platemaking with high-quality original film, flexible lithographic printing plate production is not complicated. The film's film surface and the flexible plate should be closely exposed. Before each exposure, the UV film should be cleaned. The ratio of the drug solution should meet the specific gravity requirements. When it is too viscous, the fresh drug solution should be replaced. There are many plate types that can be used. For printers in the field of flexo printing, we recommend using Dupont Cyrel TDR155 and TDR250. For smaller bar codes, DuPont "Silicon" UXL67 or UXL90 can be used as a spacer. The DuPont plate is recommended because, from the published patent specifications, DuPont's formulas are unique. The most notable feature is that when the plate comes in contact with the liquid, the strength of the DuPont plate decreases slightly, while the strength of the plates of other brands decreases, and it is easy to wash out the graphic. If expensive imported plate-making equipment is used, the choice of plates can be appropriately relaxed.
There are many problems in printing and printing. First, because the corrugated board itself is not as smooth as offset paper, the second is the use of dark brown cardboard, kraft paper, third, the domestic water-based ink on the senior sizing paper, poor adhesion fastness, of course, printing technology, The quality of the printers themselves needs to be improved.
Barcode printing thickness difference should be controlled within 0.1mm (refer to blank area and bar printing thickness difference). Since the water-based printing machine uses an anilox roller transfer ink technology, it can meet the above requirements. Corrugated cardboard face paper should use some thick smooth paper to prevent collapse deformation.
Printing barcodes on corrugated cardboard with dark brown cardboard and kraft paper is difficult to read no matter what color is used. Because of the optical properties of bar code reflectivity, reflection density, PCS
Values ​​are regulated. The empty color is too dark and close to the stripe, which will reduce the PCS value and make the barcode difficult to read. In general, the bar color should be dark, and the empty color should be light, avoiding red stripes. Because the bar code scanner light source is typically a He-Ne laser, a semiconductor laser, or an LED, a red light source with a wavelength of 630-780 mm. Red light has the highest reflectance and is white. Therefore, printing a bar code with red color cannot be read and should be noticed.
The safest color for barcodes is black and white. Therefore, it is preferable to use whiteboard as the panel, and the black color is used to satisfy the optical characteristics of the barcode. If you have to print a bar code on dark brown cardboard, there is no good way. Only preprint the white background at the bar code position and then print the black bar color. Corrugated board common face paper and ink with Table 1
Table 1
No. Paper color (empty color) Ink color (color) Can be used 1 White Black Energy 2 White Blue Energy 3 White Green Energy 4 White Dark Brown Energy 5 White Yellow Energy 6 White Orange Energy 7 White Red Energy 8 Light Yellow Black Energy 9 Light Yellow Blue Energy 10 Light Yellow Green Energy 11 Light Yellow Red Energy 12 Light Yellow Deep Brown Clock 13 Dark Brown All Colors No
Direct bar code printing on corrugated board sets new requirements for aqueous inks. Composite printing with high-speed water-based printers requires fast drying performance and sufficient hiding power. In addition, it is necessary to solve the problem of the adhesion fastness when printing high-grade sizing paper or coated paper. Such problems should be kept in close contact with ink suppliers and manufacturers, and they should be resolved by adjusting resins and additives. It is worth mentioning that the flexographic printing due to the softness of the plate may cause deformation under pressure, resulting in widening of the bar code black bars, and because the bar code direction is at a zero angle with the platen roller axial direction, the blank part of the bar code will be Widening, so the bar code center in the production of flexo bar code film must narrow the bar code, which is different from other printing methods.
How much is it appropriate to narrow (reduce)?
The usual calculation formula is:
Decreased percentage (BWR) = K÷Rх100%
In the formula, R refers to the repeat length, and the K value is a constant of the composition ratio, which is determined by the thickness of the printing plate.
Table 2 shows the different K constants for plates of different thicknesses.
Table 2
Plate thickness K (inch) K (centimeter) 45 (except CLP) 0.2360.599670.3900.991900.5431.3561000.5971.5161070.2361.6281120.6721.7071250.7541.9151550.9432.3951701.0372.634185
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