What are the reasons for the different colors of the same batch of prints?
Batch printing products with different color problem not only affects the appearance of the product quality, but also to the company's reputation damaged to varying degrees. If you are a customer, you will be disqualified from the supplier. Once the customer has severely requested the return of the same batch of different colors, the company will suffer huge economic losses. Therefore, the same batch of different colors in the printing must be highly valued and must not be taken lightly.
People in the industry know what kind of post-production is different for different companies and individuals, but it is a common problem in printing production. It is extremely difficult to solve and it is difficult to achieve effective control. This is also a headache for quality inspectors and technical quality departments, and it seems to be somewhat powerless. So what is the reason for the product to be different from the batch?
1, the problem in the ink configuration
When the production notice is issued, the ink dispenser must prepare the ink required for production. When you refer to the printing color sample and match the ink, you must never produce a close, almost identical thought. You must work hard, carefully, and rigorously. Try to be consistent with the color sample. If this level is not acceptable, it is difficult to ensure the color difference is consistent during the printing process. Of course, this requires the configuration staff to rely on years of accumulated ink experience. The machine personnel can use the matching ink to match the color sample and then pass the proofreading of the quality inspector. Once the quality inspector's approval is obtained, the ink-dispensing personnel are not finished, but the records of the configuration are recorded in the text to register the brand, model and related accessories and ink concentration of the ink. Establish and improve the product ink distribution system, and provide reliable information for future replenishment due to insufficient ink. If the ink-matching staff ignores or does not follow this effective route, it will inevitably produce the same batch of different colors.
If the product is produced, the printing lot size is large, and the number of times of dispensing is repeated, and it is easy to cause different colors in the same batch. The reason is that many printing companies mostly have two or three shifts. Different shifts have their own ink-matching personnel. If the configuration personnel can not seriously carry out the handover procedures or can not communicate in time, it will undoubtedly bury the same quality hazards of the same batch.
2. Several possible factors appearing in the production process
In the printing production process, the machine leader should check whether the ink color of the printing is consistent with the color of the proofing after the shifting. If there is any change, the ink should be adjusted in time. However, some lead machines ignore this because of lack of experience, but it is not correct to compare the color of their products with the products of the previous class. More precisely, it must not be based on the number of times of work and after-hours, which is likely to cause a wider range of chromatic aberrations.
3, the concentration of ink, the speed of the equipment
In the production process, the concentration of the ink is thick and thick, and the color difference is also involved. Some leaders worry that the ink can not be continuously produced and the continuous production will affect the completion of the quota. Therefore, it is not advisable to dilute the ink. In the case of a holiday or a weekend after the start of the week, the production will become thicker due to the precipitation of the ink, and the color difference of the printed product will definitely change. The solution is to refer to the ink concentration specimen (enterprise printing ink dilution vessel), or you can use the scrap car to wait until the ink color and proofreading are consistent and replace it with new material for printing. This is an effective measure to avoid different colors in the same batch.
4, the impact of equipment speed
The speed of the device is too fast and too slow, which also affects the color difference. It is necessary to know that the production speed is fast, all the devices of the device will heat up and become hot, and the concentration of the ink is affected. It is possible to talk about the ink to make the color lighter and the speed as stable as possible.
5, when the equipment suddenly fails to repair
When the equipment is running, if there is a sudden equipment failure and need to be repaired, be sure to remove the ink hook to close the transmission of the ink supply device. Preventing excessive repair time and excessive accumulation of ink on the printer.
6, waste film fell into the machine
During the production process, the waste film fell into the machine, and the automatic stop failure was not found in time, and the direct effect on the ink became lighter. Therefore, production personnel must always check the proofreading, emphasizing the principle of self-inspection and supplemented by special inspection.
All of the above phenomena are the main causes of chromatic aberration, and this printing problem can be overcome and eliminated as long as it is actively prevented.
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