Print bar code accurately and scientifically

Accurately and scientifically print bar codes

in recent years, almost all books and periodicals issued by publishing houses printed by printing enterprises are required to be printed with bar codes. Cigarette labels of cigarette factories, inner and outer packaging of wine boxes of wineries, and packaging and decoration of other commodities are all equipped with the pendulum mechanism, braking mechanism, electrical system and instigating device of metal impact testing machine, which are all placed on the rack with bar codes. Where is the most appropriate place for the barcode to be placed in books and periodicals, packaging and decoration, and trademarks, and what kind of color to use for scientific matching, and how to ensure that the quality of barcode printing can be controlled within the allowable error range of barcode printing in each production link such as photography, copying, jigsaw printing, printing, offset printing, relief printing, flexographic printing, etc. These are the work that all printing enterprises urgently need to strengthen and solve. We have found some experience in practical work and discussed with our printing counterparts

I. where is the barcode printing more suitable for the packaging and decoration of books and periodicals and commodity trademarks?

printing enterprises should first clearly note the location of the barcode in detail on the preparation of the production scheduling notice. Personnel engaged in book cover and commodity decoration design should master the relevant knowledge of bar code printing, achieve scientific color matching and bar code placement, and meet the requirements of printing customers and bar code readers

whether computer-designed or manually designed color samples and black-and-white drafts, the specific location of the bar code must be indicated. Formal contracts can be signed only after the samples are sent to the customer for viewing. Generally, engineering plastics refer to processing orders that can withstand mechanical stress as structural materials

generally, ① the barcode on the box type packaging material is printed on the bottom of the packaging box near the middle of a length 3. Relative humidity: ≤ 80%

② for cylindrical packaging materials such as bottles and cans, the barcode position should be printed on the lower part of the side of containers such as bottles and cans

③ bag packaging, such as cement bags, clothing bags, milk powder bags, tea bags, medicine bags, etc., is generally printed on the lower left corner of the back of the bag packaging, which is more beautiful and suitable

④ the position of cigarette label and wine box trademark bar code is printed on the left side that does not affect the design intention and idea. The area of the left and right sides of the cigarette box is small, and 1/3 of the bar code must be cut off before it can be placed

it should be noted here that whenever the equivalent (or resolution) of a pulse is only 1um, the printing enterprise cannot arbitrarily enlarge or reduce the film of the original barcode. Only with the consent of the standard metrology, technical supervision department and the customer can the corresponding barcode size be cut out

⑤ for the location of other trademark bar codes, one thing to pay attention to is not to disturb the designer's design idea and expression meaning, and it is OK to place them in the left and right lower corners of the trademark

⑥ the specific position of barcode in the printing of books and periodicals of each publishing house is generally at the lower left corner of the back cover of 16 Kai and 32 Kai books and periodicals, and there are also those printing barcode at the lower left corner of the cover of books and periodicals

second, in the process of bar code printing, what color matching is the most scientific?

when bar codes are printed on commodities, they must be identified on the bar code reader in the shopping mall in the field of commodity circulation, and must match their optical characteristics. The selection principle of bar or empty (background) color of bar code symbol is to observe all the colors to be selected through Leiden 26 color filter, which can produce dark tones such as cyan and black, including black, blue, brown, green, etc., which can be used as the color of bar; The bright tones that produce a similar white effect, such as red, orange, yellow, white, etc., are suitable for the main (background) color

the most common barcode color matching is: white background and black bar. In addition, there are blue stripes on a white background, green stripes on a white background, and dark brown stripes on a white background; Black stripe on yellow background, blue stripe on yellow background, green stripe on yellow background, dark brown stripe on yellow background; Black strip on red background, blue strip on red background, green strip on red background, dark brown strip on red background; Black stripes on orange red background, blue stripes on orange red background, green stripes on orange red background, dark brown stripes on orange red background. These are all color combinations that can be used

III. how to strictly control the quality of each process in the printing process and control the bar code printing quality within the allowable range

undertake the printing of books and periodicals, commodity packaging and decoration, and trademark bar codes. It is required that employees from the production department, design room to plate making offset printing workshop should devote themselves to learning the relevant knowledge of bar codes and understand the national standards of bar codes. They should consider: 1. The bar codes meet the scanning and reading requirements; 2. Requirements for printing process; 3. Requirements for the design intention of books, periodicals and trademarks

strictly control the entry of raw and auxiliary materials, and unqualified paper and ink shall not enter the factory and be warehoused. Give the quality inspection personnel certain power, assign special personnel to be responsible for the barcode printing quality, improve the rules and regulations of each printing process, and immediately send the barcode printing products to the technical supervision and standard measurement departments for inspection

for the negative or positive (positive and negative) barcode film brought by the customer from the technical supervision and standard measurement department, it is necessary to master the correct exposure time and development time when photographing the plate making copy, especially the exposure should not be excessive. The barcode film produced by excessive exposure is weak, swollen and has errors. For the original film of bar code symbol with standard size (m=1.0), the allowable error value of strip width is 0.005mm, and the allowable error value of bar code character is 0.013 mm. Printing enterprises cannot enlarge and shrink the original film of bar code arbitrarily. Some trademarks and bar codes in the cover of books and periodicals of the publishing house should not be copied any more. You can directly use the original film of the bar code to spell it into the cover of books and periodicals. Trademark decoration products should not be photographed or copied as far as possible, but directly spell it in, which can reduce the error in the copying process and ensure the accuracy of the bar code. If you need to copy the trademark, you should master the correct exposure and development time

it is best to choose offset printing bar codes, because offset printing products have high definition, uniform ink color and easy quality control. The printing error of relief plate and flexible resin plate is correspondingly larger. It is best to choose coated paper, whiteboard, glass paperboard, gold and silver paperboard and cloth paper for printing bar codes. The error of bar codes printed by these high-grade papers is small. When printing, the ink color is required to be uniform and the water and ink are required to be balanced. The maximum allowable error of the blank size of bar code printed matter is about 0.1mm, and its size can be measured with a microscope with a data accuracy of 0.01mm. The bar and empty contrast of the bar code should be clear, no paste, no hair, no dirty spots

the problem of ink color and color of printed bar codes is, in the final analysis, an optical property. Optical properties of bar code symbols: 1 Reflectivity; 2. Reflection density; 3. Contrast. When printing the bar code, the ink color should not be too bright, and it is best not to reflect, so that all the black bars in the bar code absorb light, and all the empty (background) reflect light. In this way, the printed bar code can meet the national standard, facilitate the reading of the bar code reader, and achieve the desired effect