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Collection Preparation work
Although G7 itself is not a true ISO standard, G7 certification requires that the materials, tools, measurement conditions and methods, and observation environment involved in the certification process must meet the requirements of relevant ISO standards. Therefore, before starting the certification process, printing enterprises must make corresponding preliminary preparations.
Ink preparation
G7 certification requires that the ink used must meet the corresponding ISO 2846 standard, which specifies clear requirements for four-color printing ink (except for G7 GrayScale grade, it is recommended to use standard ink)
Paper preparation
The required LAB value for paper white must meet the corresponding certification requirements. If the color difference of the LAB value is greater than 5, the applying company should apply through [paper white compensation adjustment].
Measurement tools
In the implementation process of G7 certification, professional measuring instruments and software need to be used to obtain necessary testing data for the certification process.
Spectrophotometer (X-Rite I1Isis, X-Rite I1IO) with calibration report not expired
Spectrodensitometers (X-Rite 530, 528, etc.) with calibration reports not expired
Printing plate measuring instrument (such as X-Rtie ICPlate2 XT, etc.), and the calibration report has not expired
Measurement software (X-Rite Colorport latest version)
The instrument and software measurement settings are as follows:
Standard illuminator: D50
Observation field of view: 2 °
Density response mode: T
Data format: M0 (UV included), CGATS format
All color measurements must comply with ISO 13655 standard
Equipment calibration
Before conducting formal certification testing, printing companies must conduct necessary testing and calibration of CTP and printing equipment, and ensure that the equipment can produce stably and correctly.
CTP calibration: According to the guidance provided by the CTP manufacturer, adjust the CTP focal length and exposure to ensure accurate reproduction of network information; Detect the operating status of the plate washing machine, control the pH value of the developing solution within an appropriate range, and ensure the stability and controllability of the physical and chemical states of the CTP plate making system.
Printing machine calibration: The printing machine (including consumables) should be maintained in a stable state and checked for compliance with relevant physical and chemical parameters. In order to better understand and control the status of the printing machine, necessary testing of the printing machine should be carried out. The main items that need to be tested include: dry density decompression test, mechanical ghost test, lifting bar test, printing registration test, etc. Adjust the printing machine based on the test results (if necessary, ask a printing technician to debug) until the printing machine is adjusted to its optimal working state.
Observing the environment
The G7 certification requires that the viewing conditions of the printing machine table meet the ISO standard. The standard viewing conditions for the printing industry are given in ISO 3664, which requires that the light source used for printing must meet the following requirements: color temperature reaches 5000K, and color rendering index (CRI) is not less than 90.
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Editor in charge：Shanghai Yue Fei Enterprise Management Consulting Co., Ltd.
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