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CYT212-2020: (Sheet-fed offset printing press suitability requirements and inspection methods)
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| CY/T 212-2020 | English | 199 |
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(Sheet-fed offset printing press suitability requirements and inspection methods)
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CY/T 212-2020
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Basic data | Standard ID | CY/T 212-2020 (CY/T212-2020) | | Description (Translated English) | (Sheet-fed offset printing press suitability requirements and inspection methods) | | Sector / Industry | Press & Publication Industry Standard (Recommended) | | Classification of Chinese Standard | A17 | | Classification of International Standard | 37.100.01 | | Word Count Estimation | 8,894 | | Date of Issue | 2020-11-16 | | Date of Implementation | 2021-02-01 | | Regulation (derived from) | Guoxin Departure Letter (2020) No. 249 | | Issuing agency(ies) | State Press and Publication Administration | CYT212-2020: (Sheet-fed offset printing press suitability requirements and inspection methods)
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Requirements and test methods for printability status of sheet-fed offset press
2020-11-16 release
2021-02-01 implementation
Press and Publication Industry Standards of the People's Republic of China
Issued by the National Press and Publication Administration of the People's Republic of China
Table of contents
1 Scope
2 Normative references
3 terms and definitions
4 technical requirements
5 Inspection conditions
6 Inspection method
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents.
This standard was proposed and managed by the National Printing Standardization Technical Committee (SAC/TC 170).
Drafting organizations of this standard. Dongguan Mingfeng Packaging Co., Ltd., Shanghai Tobacco Packaging and Printing Co., Ltd., Qufu Normal University, Shenzhen
Shenzhen Vocational and Technical College, Qingdao Hengxing Technology College, Beijing Institute of Graphic Communication, Shandong Sunshine Concept Packaging Co., Ltd., Rizhao Newspaper Media Collection
Group, Rizhao Tengfei Packaging Co., Ltd., Shandong Pacific Printing and Packaging Co., Ltd., Shenzhen Xinhongze Packaging Co., Ltd., Gu Xin (Fujian)
Data Service Co., Ltd., Xi'an Jiuxinchang Internet of Things Technology Co., Ltd., Shandong Packaging and Printing Industry Association, Xi'an Kaiyijin Electronics Division
Technology Co., Ltd., Yiwu Yining Mould Processing Factory, Shandong Industrial Technician College, Xi’an Kaijinzhe Testing Co., Ltd., Zhejiang Shangfeng Packaging
Co., Ltd., Shaanxi Juzhong Zhide Electronic Technology Co., Ltd., Shenzhen Yinweishi Electronic Commerce Technology Co., Ltd., Xi'an Ningkangte Data Service
Services Co., Ltd.
The main drafters of this standard. Chen Hua, Liu Hong, Song Zhenhai, Liu Zhuo, Cao Renxiang, Wang Lijie, Bai Ziyou, Chen Hong, Liu Xuecong, Liu Feng,
Cao Xinguan, Shi Jingjing, Chen Yong, Wang Junxu, Wang Lianjun, Li Longping, Chen Qidong, Liu Zhihong, Chen Fang, Sun Zhonghua, Zhang Xuliang, Zhao Gang,
Luo Yicang, Fu Xiuke, Duan Chunfang, Zheng Decan, Wang Zhenping, Pi Kunlin.
Foreword
1 Scope
This standard specifies the technical requirements, inspection conditions and inspection methods for the printability of sheet-fed offset presses.
This standard applies to the evaluation of the installation, use, maintenance and overhaul of sheet-fed offset printing presses.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version is applicable to this
file. For undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 3264-2013 Sheet-fed lithographic printing machine quarto and folio format
GB/T 7705-2008 Lithographic decoration printed matter
GB/T 10335.1 Coated paper and cardboard coated fine art printing paper (coated paper)
GB/T 23649 Optical, geometric and metrological requirements for reflection densitometers for printing technology process control printing
GB/T 30329.1 Printing technology. Color and transparency of four-color printing ink. Part 1.Sheet-fed and thermosetting web offset printing
CY/T 5-1999 Quality requirements and inspection methods for lithographic printing
JJG 119 laboratory pH (acidity) meter
JJG 376 Conductivity Meter Verification Regulations
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Printability status
The printing machine is adapted to the operating state required by the printing.
3.2
Sheet feeding precision
The printer conveys the printing paper before entering the printing device to locate the degree of coincidence between the actual positions of the overprinting of the same batch of samples.
[GB/T 3264-2013, definition 3.1]
3.3
Sheet transfer precision
The degree of coincidence between the actual positions of the overprinting of the same batch of samples passed by the printing press for multi-color printing.
[GB/T 3264-2013, definition 3.2]
4 Technical requirements
4.1 Basic requirements
From paper feeding, printing to paper receiving, it should be able to complete automatically and continuously, without obvious water bars, ink bars, and multi-color printing without obvious ghosting.
Sheet-fed offset printing press suitability requirements and inspection methods
4.2 Paper feeding precision
The difference between the paper feeding positions is not more than 0.030 mm.
4.3 Paper transfer precision
The difference between the paper transfer positions is not more than 0.028 mm.
4.4 Uniformity of outlet restoration
The difference between the percentages of flat screen dots in different positions of the same printed sheet is not more than 3%.
4.5 Field density uniformity
The difference between the solid density at different positions of the same printed sheet is not more than 0.2.
4.6 Printing stability
The difference between the solid density at the same position of the same batch of different printed sheets is not more than 0.05.
5 Inspection conditions
5.1 Inspection environment
5.1.1 Temperature (23±5) ℃, relative humidity (55±10) ﹪.
5.1.2 The power supply voltage and fluctuation range should meet the requirements of the equipment manual.
5.2 Material requirements
5.2.1 Plate
It is advisable to use CTP plates as test printing plates.
5.2.2 Paper
5.2.2.1 It is advisable to use 157 g/m2 or 128 g/m2 coated paper that meets the requirements of GB/T 10335.1.
5.2.2.2 The breadth should be the largest paper feed breadth of the machine.
5.2.2.3 The thread direction should be perpendicular to the paper feeding direction.
5.2.3 Ink
Should meet the requirements of GB/T 30329.1.
5.2.4 Wetting fluid
5.2.4.1 The pH value should be 5.0 ~ 5.5, and the conductivity should be (800 ~ 1400) μS/cm.
5.2.4.2 The temperature should be (8 ～ 12) ℃.
5.3 Testing equipment
5.3.1 A reflection densitometer that meets the requirements of GB/T 23649 should be used.
5.3.2 A scaled magnifying glass with a division value of 0.01 mm and a magnification of 25 times or more shall be used.
5.3.3 A conductivity meter that meets the requirements of JJG 376 should be used.
5.3.4 A pH (acidity) meter that meets the requirements of JJG 119 shall be used.
6 Inspection method
6.1 Dry run test
Follow the method of GB/T 3264-2013 6.2.
6.2 Inspection of paper feeding precision
Follow the method in GB/T 3264-2013 6.4.2.1.
6.3 Inspection of paper transfer precision
Follow the method in GB/T 3264-2013 6.4.2.2.
6.4 Inspection of uniformity of outlet restoration
6.4.1 At 85% of the maximum printing speed of the press, continuous printing of a full-page flat screen with a 50% dot percentage. 70 lines/cm should be used for flat nets
Or square dots with 80 lines/cm.
6.4.2 The increased value of outlets should meet the requirements of GB/T 7705-2008 5.4.2 for fine products.
6.4.3 Take 2 sample sheets every 100 sheets from the continuous printing sample sheets, 3 times in total.
6.4.4 As shown in Figure 1, use a reflection densitometer to measure the percentage of dots at least 5 dots on each sample.
6.4.5 Take the difference between the maximum dot percentage and the minimum dot percentage on the same printed sheet as the index of the uniformity of the dot restoration.
6.5 Field density uniformity inspection
6.5.1 Continuously print full-page solid areas at 85% of the maximum printing speed of the press.
6.5.2 The field density should meet the requirements of CY/T 5-1999 4.1.1 for the field density of fine prints.
6.5.3 Take 2 sample sheets every 100 sheets from the continuous printing sample sheets, 3 times in total.
6.5.4 As shown in Figure 1, use a reflection densitometer to measure the field density of at least 5 points on each sample sheet.
6.5.5 Take the difference between the maximum density value and the minimum density value on the same printed sheet as the solid density uniformity index.
6.6 Printing stability inspection
6.6.1 Continuously print full-page solid areas at 85% of the maximum printing speed of the press.
6.6.2 The field density should meet the requirements of CY/T 5-1999 4.1.1 for the field density of fine prints.
6.6.3 Take 2 sample sheets every 100 sheets from the continuous printing sample sheets, 3 times in total.
6.6.4 Use a reflection densitometer to measure the field density of different sheets at the same location.
6.6.5 Perform density measurement at the same position on different printed sheets of the same batch, and take the difference between the maximum density value and the minimum density value as the printing
Brush stability index.
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