Established in 2002, Shenzhen Yutong Packaging Technology Co., Ltd. is a leading company in the field of IT subdivision and packaging in China. It has more than 30 subsidiaries and implements group management. In order to strengthen the ability of color management, realize the unification of printing colors of subsidiaries, take the road of printing standardization, dataization and standardization, and improve the competitiveness of enterprises at home and abroad, Yutong embarked on the road to G7 certification and achieved gratifying results.
G7 certification, the stepping stone for printing standardization
There are many popular printing standardization certifications on the market, including PSA, PSO, G7, and G7 PC certifications. Table 1 shows the contents of the international mainstream standardization certification. Since the G7 certification only verifies the results of printing, it is simpler, more efficient, and less expensive than other standardized certifications. It can quickly achieve color uniformity and is more widely accepted by printing companies. It is a stepping stone for printing companies to become standardized in printing. Therefore, although Yutong owns certification experts such as PSO and PSA, it prefers G7 certification. Therefore, starting in 2010, Yutong introduced and mastered the G7 method, and it has been launched in various subsidiaries. At present, Shenzhen Yutong headquarters, Longgang Yutong, Yantai Yutong, Suzhou Yutong, Wuhan Yutong, A total of 6 subsidiaries of Vietnam Yutong won the G7 certification, which also represents the real strength of Yutong.
Yutong has established a variety of R&D centers as its core strategy of “adhering to independent innovation and maintaining technological leadershipâ€. Among them, the printing technology center includes various expert teams such as G7 certified experts, Ugra certified experts, etc. Each subsidiary can provide color management training, software, equipment upgrades, proofing, color solutions, and other support. Yutong has its own G7 certification experts to avoid the G7 certification experts in the enterprise when they use the G7 method. Once the G7 certification expert goes away, the company's production will return to the original embarrassing situation.
At present, Yutong’s subsidiaries are able to apply the G7 methodology to their applications. The equipment maintenance and maintenance system and the standardization and standardization of employees ensure that all the printing presses are in a stable state of operation. Moreover, the production workshops of all subsidiaries are also equipped with quality. In-line scanners, densitometers and other measuring equipment combine with production conditions to ensure print quality. Such a grouped Yutong can achieve the same appearance and color as the branded products produced in different regions. The nearest production and service customers become Yutong’s strong competitiveness in the industry, and homogenized production in different regions. Can win the trust of customers.
What's the difference between the new development and G7 certification from 2006 to 2013?
Difference 1 : Color Difference Formula
The color difference formula changed from CIE 1976 to CIE 2000. The requirement of color tolerance for the two color difference formulas is shown in Figure 1. As can be seen from the figure, the tolerance of CIE 2000 indicated by yellow is smaller when a and b are closer to 0. That is to say, the closer the CIE 2000 is to the intermediate axis neutral gray, the more the color tolerance of CIE 2000 is. The more stringent the requirements are, it is also in line with the characteristics of human eyes that are extremely sensitive to gray. However, in the bright colors that are insensitive to the human eye, that is, in the periphery, the CIE 2000 has reduced its requirements. It can be seen that, compared with CIE 1976's practice of equalizing all colors, CIE 2000 pays more attention to the color perception of the human eye, which is consistent with the G7 certification's focus on the visual effect.
The color difference requirements of CIE 2000 and CIE 1976 color difference formulas in G7 certification are shown in Table 2. Although the color difference of the new version of the G7 certification is reduced numerically, it is not difficult to achieve, and the tolerance of the 7 basic colors of CMYKRGB can easily meet the standard requirements.
Difference 2 : Paper color value
Due to the increasing number of printing papers containing fluorescent brighteners on the market, the new G7 certification changed the paper's CIE Lab value from (95,0,-2) to (95,1,-4), which is more in line with current The actual production situation of printing companies.
Difference 3 : Color Measurement Mode
The color measurement mode was changed from M0 to M1 in order to improve the accuracy of paper measurement data containing fluorescent whitening agents. For the printing company, it is necessary to equip the measurement instrument with the M1 color measurement mode and the corresponding measurement software. To this end, Yutong replaced most portable spectrophotometers with X-Rite eXact spectrophotometers and equipped with i1iSis2 automatic color table reader, i1iO2 automatic color table scanning platform and i1Profiler software to obtain accurate measurement data. Accurate measurement data is an important basis for printing data and standardization.
Difference 4 : Basic Color CIE Lab Values
There are also changes in the CIE Lab values ​​for the seven basic colors, as shown in Table 3.
Actually, Yutong's 2013 G7 certification process
To implement the new G7 certification and meet the needs of international customers, Yutong and Suzhou Coswood Ink Co., Ltd. (hereinafter referred to as “Coswoodâ€) have developed a set of inks suitable for the 2013 version of the G7 certification, and the hue of this set of ink, Overprint rates, dot gains, dry retreats, and even a series of attributes such as PP lamination, folding, folding, etc., have been tested, and 2013 G7s were successively acquired at Shenzhen Yutong headquarters and Yantai Yuli Subsidiary. The certification proves that this set of ink not only satisfies our company's printing and post-printing requirements, but also can play a role in the technical introduction of the 2013 G7 certification in actual printing production.
1. Prepare the project
(1) Material
Coswood Ink, Cathay Pacific Sun 157g/m2 coated paper, Gaobang Weiye GB-800B waterborne oil.
(2) Instruments, software
X-Rite eXact spectrophotometer, IntelliTrax automatic scanner, i1iSis2 automatic color table reader, Curve3 software and i1Profiler software, Heidelberg Prinect Digital Workflow, CTP , Speedmaster CX 102-6+L printer, TECHKON printing plate Measuring instrument.
(3) Equipment status
The Heidelberg CTP and Speedmaster CX 102-6+L presses are in stable operation.
2. Certification process
(1) First linear printing
1 A linear version was printed before printing. The TECHKON plate measuring instrument was used to measure the dots and strips on the printing plate to ensure that the dot size on the prepress file was the same as the dot size on the printing plate. Figure 2 shows the test file.
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