For customers, if they want to improve their modern management level in the production, storage, distribution, sales and other aspects of the goods, they will pay attention to the printing quality of product barcodes. Therefore, the flexible packaging factory must pay attention to the following five links.
1, barcode design
According to GB/T14257-2009 "Commodity Barcode Bar Code Symbol Placement Guide" and other relevant standards, comprehensive evaluation of the barcode position of the packaging bag, determine the best solution, such as the color and deformation of the content before and after loading the content in the case of the bar code forward brush Analysis and solution; heat sealing edge pressure on the bar code, half of the smooth half and half of the cloth texture at the junction of the analysis and solution; bar code position is flat, back view caused by unqualified solutions.
For the size requirements, strictly in accordance with the international standard magnification factor table design, and pay special attention to the calculation and control of the left and right blank areas; color to ensure that the strip reflectance meets the contrast requirements, because the plastic has a certain luster, the bar code for composite printing Focus control by changing the contrast change caused by the strip reflectance, leaving a color margin and increasing the reflectance. In the color inspection, the US X-RITE spectrophotometer is adopted, the color matching is efficient, the color reproduction is accurate, and the color is quickly prepared and accurately detected.
2, plate making
The bar code original film with high precision is selected. The strip width adjustment of the film is compatible with the gravure printing process. The wire mesh of the strip part is relatively deep and dense. The mesh line is shallow and the ink is not enough to ensure sufficient hiding power. It is easy to deform, and the edges of the printed strips are not neat.
3, composite printing
Bar code and other patterns can be printed at the same time. The technical means can be adjusted for hue adjustment, and the barcode reading is given priority. It is not possible to consider re-plate making. If the ink is not strong and wear-resistant, it will cause the ink to fall off during the use of the flow, resulting in a defective barcode.
For non-polar materials such as polyethylene and polypropylene, due to poor adhesion, focus on, and the ink maintains a certain viscosity, to avoid low ink hiding power, ink quality selection is particularly cautious, the procurement system stipulates the use of high-quality ink to ensure Ink density, and the ink index stipulates that it has sufficient high temperature stability to prevent the color change of the barcode during the compounding and post-processing. The printing tension is strictly controlled for the bar code printing, and the drying temperature (100,000-level purification workshop, constant temperature and humidity printing) Environmental conditions and other process conditions, try to avoid shrinkage changes in size.
In the case of composite stretching, if the temperature is too high or the tension is too high, the plastic film stretching phenomenon will occur, resulting in deformation of the bar code. Therefore, the production conditions should be strictly controlled to avoid stretching.
In addition, if a binder is added during the compounding process, the plastic film can be prevented from wrinkling at the coating of the agent A. Although the wrinkles can be adjusted and removed before the compounding machine head by the analysis, since the binder contains the solvent ethyl acetate The wrinkles of the ink in the bar code portion under the application of the coating roller and the pressure roller may be dissolved, causing breakage, and there is a risk of affecting the reading effect.
4, packaging factors
Inflatable packaging has a flat appearance and has no adverse effect on bar code printing and reading; vacuum packaging and heat shrink packaging should focus on the vacuum packaging because it is close to the surface of the content, irregular, and the surface is uneven, thus deforming the barcode. Can not read, so vacuum packaging to avoid direct printing, consider adding an outer bag printing barcode.
For heat shrink packaging, when printing barcodes, it is necessary to consider the position where the film shrinks the barcode, calculate the vertical and horizontal shrinkage coefficients, and pre-adjust the barcode size during plate making, and select a high-quality shrink film with uniform shrinkage. It is necessary to ensure that the strips are in the same plane after heat shrinkage of the film.
5, inspection
Advanced bar code detectors are essential for regular staff training. For process inspection, the workshop quality inspector generally carries out the production process inspection for each batch of products. It is necessary to pay attention to the first inspection and leave the inspection records, distinguish the duties, and carry out batch sampling inspection according to the sampling standard according to the stability of the machine. If the problem is found, stop the problem immediately and find the cause, and adjust it according to the corrective measures in time until it is qualified.
The quality inspection department is mainly responsible for the spot inspection of finished products, retains the original records in accordance with the regulations, has the rewards and penalties to be assessed, and regularly reports the results to the chairman and general manager by the technical director, and incorporates the normal inspection of the bar code factory inspection so that each batch of products has According to the investigation, the tracking and traceability are realized, signed and archived by the relevant leaders, and the printing sample inspection method is improved. The printing sample is lining the dark bottom and the inner packaging to check the factors to ensure the barcode pass rate.
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