Some standard content:
ICS37.100.01
National Standard of the People's Republic of China
GB/T7705—2008
Replaces GB/T7705—1987
The offset lithographic prints for decorating2008-07-02issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaStandardization Administration of China
2008-12-01implemented
Normative references
Terms and definitions
Product classification
Technical requirements
Inspection methods
Inspection rules
Marking, packaging, transportation, storage
References·
GB/T7705--2008
This standard replaces GB/T7705--1987 "Lithographic decorative prints". Compared with GB/T7705--1987, this standard has been modified as follows: The structure of the standard has been modified in accordance with GB/T1.12000. Appropriate modifications have been made to "appearance", "finished product size deviation", "registration error" and "solid printing requirements" in GB/T7705-2008. The standard has added post-printing processing requirements such as "foil hot stamping", "embossing", "laminating" and "pressing and calendering" and "ink layer wear resistance", "ink layer after glazing the printed surface wear resistance" and other requirements. This standard is proposed by the General Administration of Press and Publication. This standard is under the jurisdiction of the National Printing Standardization Technical Committee. The drafting units of this standard are: Shanghai Packaging and Paper (Group) Co., Ltd., Shanghai Station for Quality Supervision and Inspection of National Light Industry Packaging and Decoration Printing Products, Shanghai Tobacco Industry Printing Factory, Shanghai Electric Group Printing and Packaging Machinery Co., Ltd., Shanghai Jielong Industrial Co., Ltd., Wuxi Foreign Trade Printing Co., Ltd., Shanghai Zidan Printing Co., Ltd., Zhejiang Tianwai Packaging Printing Co., Ltd., Shanghai Textile Printing and Packaging Co., Ltd., and China Packaging Technology Association Packaging Printing Committee. The main drafters of this standard are Zheng Shaonan, Chen Qixiang, Xu Zhanwang, Gao Huijing, Sun Jianfa, He Congyou, Zhang Yaozong, Chen Haizang, Gong Zhongde, Yang Yong, Zhou Mingxiang, Gu Wenjie and Gao Shanlin. This standard was first issued in 1987.
1 Scope
Lithographic decorative printed productsbZxz.net
GB/T7705—2008
This standard specifies the classification, requirements, inspection methods, inspection rules, marking, packaging, transportation, storage, etc. of lithographic decorative printed products. This standard applies to paper decorative printed products produced by lithographic offset printing technology, and other lithographic printed products can also be used as a reference. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For all dated referenced documents, all subsequent amendments (excluding errata) or revised versions are not applicable to this standard. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this standard. GB/T2828.1 Sampling inspection procedures for attributes Part 1: Sampling plan for batch inspection based on acceptance quality limit (AQL) (GB/T2828.1-2003, ISO2859-1:1999, IDT) GB/T17934.1-1999 Printing technology Process control for halftone color separations, samples and printed products Part 1: Parameters and test methods (eqvISO12647-1:1996) GB/T18720 Printing technology Application of printing control strips (GB/T18720-2002, DIN16527-1:1993, DIN16527-31993 ,NEQ)
Printing technology Application of reflection density measurement and colorimetry in printing process control (GB/T18722-GB/T18722
2002,eqyISO13656:2000)
CY/T3 Color evaluation Illumination and viewing conditions
ISO13655 Spectral measurement and colorimetric calculation of printed images Optical geometry and metrology conditions for reflection densitometers used in printing ISO14981
ISO15994
Printing technology Test of printed products Visual gloss 3 Terms and definitions
The following terms and definitions apply to this standard. 3.1
Planographic printing Planographic printing is a printing method in which the image and non-image parts of the printing plate are almost on the same plane. [GB/T9851,1—2008,5.10]
Offset printing
A lithographic printing method in which the ink on the printing plate is first transferred to the rubber blanket and then transferred to the substrate. [GB/T9851.1-2008,5.10.1]
Hotfoil-stamping
A process in which the hot stamping material is transferred to the substrate by a hot stamping die on paper, cardboard, paper products, coatings, etc. [GB/T9851.7—2008,4.6]
Embossed
A process in which a concave and convex pattern or texture is pressed onto a printed product using a die. [GB/T9851.7—2008,4.1]
GB/T7705—2008
filmlaminating
The process of laminating a plastic film coated with an adhesive to the surface of a printed product. [GB/T9851.7--2008,4.5]
coating
The process of coating a transparent and bright material on the surface of a printed product. [GB/T9851.7—2008,4.4]
calendering
The process of rolling a printed product with a coating layer through a roller to increase its gloss. 『GB/T9851.9—1990,10.5
prime section
The part of the picture that reflects the theme, such as images, text, logos, etc. 3.9
Subprime section
Other parts of the screen except the main part. 4 Product classification
4.1 Fine products
High-grade decorative printed products produced with high-quality printing materials and fine plate-making and printing technology, and whose quality meets the requirements of fine products. 4.2 General products
Other decorative printed products except fine products. 5 Technical requirements
5.1 Finished product specification and size deviation
5.1.1 The specification and size deviation of the cut finished product shall comply with the provisions of Table 1. Table 1 Specification and size deviation of the cut finished product
Specifications of the cut finished product
Fine products
390×543 and below
Above 390×543
The specification and size deviation of the die-cut finished product shall comply with the provisions of Table 2. ±0.5
Table 2 Dimensional deviation of die-cut finished product specifications
Specifications of die-cut finished products
Fine products
135×195 and below
Above 135×195
The positional deviation of the finished product pattern with symmetry requirements shall comply with the provisions of Table 3. 5.1.3
Dimensional limit deviation
Dimensional limit deviation
Unit is meter
General products
Unit is meter
General products
Finished product specifications
135×195 and below
Above 135×195
Table 3 Positional deviation of finished product pattern with symmetry requirements Symmetrical pattern position limit deviation
Fine products
Overprint error shall comply with the provisions of Table 4.
Overprinting position
Main position
Secondary position
The requirements for solid printing shall comply with the provisions of Table 5. Table 5
Item name
Density deviation of the same color
Color difference of the same color in the same batch
Glossiness of ink layer
Abrasion resistance of ink layer"
Abrasion resistance of printed surface after ink layer glazing
CIEL'a'b
, This indicator can be cancelled for products without glossiness requirements. bThis indicator can be cancelled for products without abrasion resistance requirements. 5.4 Dot printing requirements
Overprinting error
Allowable overprinting error
Fine products
Solid printing requirements
G,(60)
Fine products
GB/T7705-2008
Unit is meter
General products
Unit is meter
General products
Indicator value
General products
L≤50.00
Light tone dot reproduction percentage: fine products <3% General products <5%, 5.4.1
5.4.2 Normal ink volume 50% dot gain value should comply with the provisions of Table 6. Table 6 50% dot gain value
Indicator name
50% dot gain value (4F)*
Under normal solid density of color measurement.
5.5 Printing surface appearance
5.5.1 Fine products
Fine products
General products
L≤50.00
5.5.1.1 The finished product should be neat and tidy. The main parts of each finished product should not have dirt such as leather and paper hair with a diameter > 0.3mm, and the dirt such as leather and paper hair with a diameter ≤ 0.3mm should not exceed 2 points; the secondary parts should not have dirt such as ink leather and paper hair with a diameter > 1mm, and the dirt such as ink leather and paper hair with a diameter < 1mm should not exceed 3 points. 5.5.1.2 The printed text should be clear and complete, and the characters smaller than 5.5P (No. 7) should not affect the reading. Note: P—Point, 1P is approximately equal to 0.35mm3
GB/T7705-2008
5.5.1.3 The printing surface should not have scratches and streaks. 5.5.1.4 The image should be clear, with clear layers, and the dots should be clear and uniform without deformation and incompleteness. 5.5.1.5 The printing color should meet the requirements of the printed sample. 5.5.2 General products
5.5.2.1 The finished product should be neat. There should be no ink skin, paper hair and other dirt with a diameter >1.5mm on the main part of each finished product, and the ink skin, paper hair and other dirt with a diameter <1.5mm should not exceed 2 points; there should be no ink skin, paper hair and other dirt with a diameter >2mm on the secondary part, and the ink skin, paper hair and other dirt with a diameter ≤2mm should not exceed 5 points. 5.5.2.2 The text printing should be basically clear and complete, and the words smaller than 5.5P (No. 7) should not affect the reading. Note: PPoint, 1P is approximately equal to 0.35mm.
5.5.2.3 There should be no obvious streaks on the printed surface. 5.5.2.4 The dots should be clear and uniform, and there should be no obvious incompleteness and blurred version. 5.5.2.5 The printing color should basically meet the requirements of the printing sample. 5.6 Appearance of hot foil on the printed surface
5.6.1 Fine products
5.6.1.1 The hot foil on the image and text should be complete, clear, firm and flat, and there should be no false hot foil, smudged plate, dirty plate and sand holes. 5.6.1.2 The hot foil on the handwriting should be clear, without hairiness, missing strokes or broken lines. 5.6.1.3 The surface of the hot foil on the image and text should be bright.
5.6.2 General products
5.6.2.1 The hot foil on the image and text should be complete, clear, firm and flat, and there should be no obvious false hot foil, smudged plate or dirty plate. 5.6.2.2 The hot foil on the handwriting should be clear, without obvious defects. 5.6.2.3 There should be no obvious difference in the brightness of the hot foil on the image and text. 5.7 Appearance of embossed printing on the printed surface
5.7.1 Fine products
5.7.1.1 The outline of the embossed printing of the image and text should be clear. 5.7.1.2 The embossing of the image and text should be uniform, and there should be no break in the paper fibers. 5.7.2 General products
5.7.2.1 The outline of the embossed printing of the image and text should be basically clear. 5.7.2.2 The embossing of the image and text should be basically uniform, and there should be no break in the paper fibers. 5.8 Appearance of lamination on the printed surface
5.8.1 Fine products
5.8.1.1 The lamination bonding should be complete and firm. 5.8.1.2 The lamination surface should be clean, flat, with good finish, no discoloration, and no wrinkles, bubbles, etc. 5.8.2 General products
5.8.2.1 The lamination bonding should be complete and firm. 5.8.2.2 The laminating surface should be basically clean and flat, without obvious wrinkles, bubbles, etc. 5.9 Printing and calendering appearance
5.9.1 Fine products
5.9.1.1 The glazing coating should be applied evenly, and there should be no bubbles, streaks, wrinkles, etc. on the surface. 5.9.1.2 The brightness of both sides of the glazing film surface should be consistent and have good gloss. 5.9.1.3 The brightness of the calendered surface should be consistent and have high gloss. General products
5.9.2.1 The glazing coating should be applied evenly, and a small amount of acceptable small bubbles are allowed on the surface, but no streaks, wrinkles, etc. should be allowed. 5.9.2.2 The brightness of both sides of the glazing film surface should be basically consistent and have good gloss. 4
5.9.2.3 The brightness of the calendered surface should be basically consistent and have high gloss. 6 Inspection method
6.1 Inspection conditions
6.1.1 Inspection room temperature and humidity: the temperature is 23℃±5℃, and the relative humidity is 60%±60%. 6.1.2 Sample pretreatment: under the conditions of 6.1.1, and placed in an environment without ultraviolet light for ≥8h. 6.1.3 Sample viewing light source: in accordance with the provisions of CY/T3. 6.2 Appearance, hot foil, embossing, laminating, top/calendering GB/T77052008
Put the sample under the light source of 6.1.3 for visual inspection. Dirt spots are measured with a 20x reading magnifying glass with an accuracy of 0.01mm. 6.3 Finished product specification and size deviation
6.3.1 Cutting and die-cutting finished product specification and size deviation Measure the length (accuracy 0.1mm) of the cut or die-cut finished product sample part with specified size, and the difference with the specified size is taken as the finished product specification and size deviation.
6.3.2 Position deviation of finished pattern with symmetry requirement Measure the width of blank space (accuracy: 0.1mm) of any symmetrical part on the left and right (or top and bottom) of the sample, and then calculate the position deviation of the finished pattern according to formula (1).
Where:
= Position deviation of finished pattern, mm;
8= Ld -dal
di, dz Width of blank space on the left and right (or top and bottom) of the symmetrical part of the sample, mm. 6.4 Overprint error
. (1)
Place the sample under the light source of 6.1.3, and use a 20x reading magnifying glass with an accuracy of 0.01mm to measure the overprint error between any two colors in the main part and the secondary part of the sample at 3 points, and take the maximum value as the overprint error of the main part and the secondary part of the sample. 6.5 Density deviation of the same color
6.5.1 Instrument
Use a reflection densitometer that complies with ISO14981. 6.5.2 Instrument calibration and use
Perform according to the provisions of GB/T18722.
6.5.3 Inspection steps
6.5.3.1 During the test, the printed matter shall be placed flat on the backing material that meets the requirements of Appendix B\Backing materials for measuring reflection density" of GB/T17934.1-1999.
6.5.3.2 Instrument calibration and use method: According to the requirements of 6.5.2. 6.5.3.3 For finished products with a format size of 135mm×195mm and below, use a reflective color densitometer to measure one point each at the four corners and the middle of the same color of the same sample; format 135mm×195mm For the above finished products, 5 additional points shall be measured evenly on the same sample. 6.5.4 Test results
6.5.4.1 The color density deviation of each sample shall be calculated according to formula (2). Z(DD,)2
Wherein:
D,—color density deviation;
D—average value of n times of color density;
（2）
GB/T7705-2008
the color density measured for the first time;
the number of times measured.
6.5.4.2 Compare the color density of each color The average value of the density deviation is taken as the maximum value as the density deviation of the same color of the sample. 6.6 Color difference of the same color in the same batch
6.6.1 Instrument
Use a spectrophotometer (colorimeter) that complies with ISO13655. 6.6.2 Instrument calibration and use method
Perform in accordance with the provisions of GB/T18722.
6.6.3 Inspection steps
Select one of the samples as the reference sample, use a spectrophotometer to first measure its L\α'b\ value in the CIEL*α'6 uniform color space, and then measure The color difference of the same color and the same part of the rest of the samples and the reference sample. 6.6.4 Test results
Compare the color difference of the same color of each color of the sample in the same batch, and take the maximum value as the color difference of the same color of the sample in the same batch. 6.7 Glossiness of ink layer
6.7.1 Instrument
Use a gloss meter that complies with ISO15994. 6.7.2 Instrument calibration and use method
Perform in accordance with the provisions of ISO15994.
6.7.3 Test steps
6.7.3.1 Take a flat, wrinkle-free sample. 6.7.3.2 Use a gloss meter to measure the surface of different color layers of the sample. Measure 3 points on the color layer with an area of ≤100cm2 and 5 points on the color layer with an area of >100cm2.
6.7.3.3 When the difference in gloss measurement results of each color of each sample is >5 gloss units, the number of measurement points should be doubled. 6.7.4 Test results
Calculate the average gloss of the same color at each point of the sample as the gloss of the ink layer of the sample. 6.8 Wear resistance of ink layer and wear resistance of printed surface after ink layer glazing 6.8.1 Instrument
6.8.1.1 Friction test machine
The friction table adopts a hard plastic body with a surface roughness of not less than 1.60um and a device for fixing the sample. The friction body adopts two pieces of rubber with a thickness of 8mm, a hardness of 50Hs~53Hs and a size of 25mm×50mm. The inner sides of the two friction bodies are 45mm apart; the friction test friction frequency reaches 43 times/min±2 times/min, and the stroke is about 60mm. The friction test machine is shown in Figure 1. Movement direction
Friction paper
Friction table
Waste body
Figure 1 Friction test machine
6.8.1.2 Reflection densitometer
The reflection densitometer is the same as 6.5.1 and 6.5.2.
6.8.2 Test conditions
6.8.2.1 The friction paper is 80g/m2 clean offset paper with a width of 50mm. 6.8.2.2 The load is 20N±0.2N.
6.8.2.3 The number of frictions is 43 times/min±2 times/min, and the stroke is about 60mm. 6.8.3 Test steps
GB/T7705-2008
6.8.3.1 The sample cut into a certain size is fixed on the friction table. The area of the sample layer to be measured should be larger than the area rubbed by the friction body. 6.8.3.2 According to 6.5.3, the color density of the ink layer to be ground on the sample is measured, and the average value is taken for 3 points. 6.8.3.3 Fix the sample on the friction table and fix the friction paper on the friction body. 6.8.3.4 Turn on the friction tester and rub back and forth 43 times/min ± 2 times/min, stop the machine and remove the sample. 6.8.3.5 Determine the color density of the most severely rubbed ink layer according to 6.5.3, and measure 3 points to get the average value. 6.8.4 Test results
The wear resistance of the ink layer and the wear resistance of the printed surface after the wall layer is glazed shall be calculated according to formula (3). D
×100%
Where:
A, ink layer wear resistance;
D-average density value after sample friction;
D. Average density value before sample friction.
6.9 Highlight dot reproduction percentage
(3)
Take a sample (natural sample) printed with a printed control strip. The control strip should comply with the provisions of GB/T18720. Use a 20x to 50x magnifying glass to measure the highlight dot blocks of each color on the printed control strip of the sample. The percentage of highlight dots that can be seen is taken as the highlight dot reproduction percentage of the sample.
6.1050% dot gain value
6.10.1 Instrument
Reflection densitometer is the same as 6.5.1 and 6.5.2.
6.10.2 Inspection steps
6.10.2.1Take a sample (natural sample) printed with a printed control strip. The control strip should comply with the provisions of GB/T18720. 6.10.2.2 Use a reflective color densitometer that complies with the provisions of 6.5.1 and 6.5.2 to measure the solid block density value of any color on the sample printing control strip, and then measure the dot density value of the same color with nominal coverage. 6.10.2.3 Then calculate the actual area coverage F (%) value of 50% dots of any color on the sample according to formula (4). Fp
Where:
1—10-DR
1-10-×100%
-Actual area coverage (%) of 50% dots of any color on the sample; Dv
Solid density value of any color;
DThe dot density value of 50% nominal coverage of the same color. 6.10.3 Inspection results
6.10.3.1 Calculate the 50% dot gain value AF of any color according to formula (5). AF =FD-50%
Wherein:
AF—50% dot gain value of any color;
·（4）
GB/T7705--2008
Fp——50% actual area coverage of dots of any color on the sample (%); 50% nominal coverage of the same color.
6.10.3.2 The maximum value of the dot gain value of each color of the sample is taken as the 50% dot gain value of the color of the sample. 7 Inspection rules
7.1 A group of unit products of the same variety, same specification and same production cycle with basically the same production conditions is a batch. 7.2 Sampling inspection shall be carried out in accordance with the provisions of the inspection sampling plan of GB/T2828.1. The sample unit is piece. The minimum number of samples for each batch is generally 5 pieces.
7.3 Determination of unqualified products: Each product shall be inspected according to the provisions of this standard. If one or more technical indicators do not meet the requirements, the product shall be unqualified.
7.4 Determination of unqualified batches: Each batch of products shall be inspected according to the provisions of this standard. If one or more of them are unqualified, double sampling and re-inspection shall be carried out. If there are still one or more unqualified products, the batch shall be unqualified. 8 Marking, packaging, transportation, compensation and storage
8.1 Marking
A qualified label shall be affixed to the obvious part of each package, indicating the user unit, product name, variety and specification, quantity, manufacturer name, production date and inspector code, etc.
8.2 Packaging
Packaging and bundling shall be carried out in cartons or with strong wrapping paper and strapping tape according to the contract requirements or the volume, quality and quantity of the product. 8.3 Transportation
During transportation, the product must not be thrown, smashed or stepped on. It must be protected from moisture, exposure to the sun, rain, heat, heavy pressure, corrosive gases and liquids. 8.4 Storage
The storage environment must be ventilated and moisture-proof, dust-proof, sun-proof, oil-proof, mildew-proof, corrosive gases and liquids. Heavy pressure is not allowed. The storage period is generally no more than 6 months from the date of production.
GB/T9851.1—2008
GB/T9851.7—2008
GB/T9851.9—1990
Printing Technology Terms
Printing Technology Terms
Printing Technology Terms
Part 1: Basic Terms
Part 7: Post-press Terms
Part 9: Post-press Terms.
GB/T7705—20084 Test results
The abrasion resistance of the ink layer and the printed surface after the wall layer is glazed is calculated according to formula (3). D
×100%
Wherein:
A, ink layer abrasion resistance;
D-average density value after the sample is rubbed;
D. Average density value before the sample is rubbed.
6.9 Highlight dot reproduction percentage
(3)
Take a sample (natural sample) printed with a printing control strip. The control strip should comply with the provisions of GB/T18720. Use a 20x to 50x magnifying glass to measure the highlight dot blocks of each color on the sample printing control strip. The percentage of highlight dots that can be seen is taken as the highlight dot reproduction percentage of the sample.
6.1050% dot gain value
6.10.1 Instrument
Reflection densitometer Same as 6.5.1 and 6.5.2.
6.10.2 Inspection steps
6.10.2.1 Take a sample (natural sample) printed with a printed control strip. The control strip should comply with the provisions of GB/T18720. 6.10.2.2 Use a reflective color densitometer that complies with the provisions of 6.5.1 and 6.5.2 to measure the solid block density value of any color on the sample printed control strip, and then measure the dot density value of the same color nominal coverage. 6.10.2.3 Then calculate the actual area coverage F (%) value of 50% dots of any color on the sample according to formula (4). Fp
In the formula:
1—10-DR
1-10-×100%
Actual area coverage of 50% dots of any color on a test specimen (%); Dv
Solid density value of any color;
DDot density value of the same color with a nominal coverage of 50%. 6.10.3 Test results
6.10.3.1 Calculate the 50% dot gain value AF of any color according to formula (5). AF =FD-50%
In the formula:
AF—50% dot gain value of any color;
·（4）
GB/T7705--2008
Fp——Actual area coverage of 50% dots of any color on a test specimen (%); 50% nominal coverage of the same color.
6.10.3.2 The maximum value among the dot gain values of each color of the sample shall be taken as the 50% dot gain value of the color of the sample. 7 Inspection rules
7.1 A group of unit products of the same variety, specification and production cycle with basically the same production conditions shall be a batch. 7.2 Sampling inspection shall be carried out in accordance with the provisions of the inspection sampling plan of GB/T2828.1. The sample unit is piece. The minimum number of samples for each batch is generally 5 pieces.
7.3 Determination of unqualified products: Each product shall be inspected in accordance with the provisions of this standard. If one or more technical indicators do not meet the requirements, the product shall be unqualified.
7.4 Determination of unqualified batches: Each batch of products shall be inspected in accordance with the provisions of this standard. If one or more of them are unqualified, double sampling shall be conducted for re-inspection. If there is still one or more unqualified products, the batch shall be unqualified. 8 Marking, packaging, transportation, compensation and storage
8.1 Marking
A qualified label should be affixed to the obvious part of each package, indicating the user unit, product name, variety and specification, quantity, manufacturer name, production date and inspector code, etc.
8.2 Packaging
Packaging and bundling in cartons or strong wrapping paper and strapping tape according to the contract requirements or the volume, quality and quantity of the product. 8.3 Transportation
Do not throw, smash or step on during transportation. It should be protected from moisture, sun exposure, rain, heat, heavy pressure, corrosive gas and liquid. 8.4 Storage
The storage environment requires ventilation and moisture, dust, sun protection, oil, mildew, corrosive gas, liquid, and no heavy pressure. The storage period is generally no more than 6 months from the date of production.
GB/T9851.1—2008
GB/T9851.7—2008
GB/T9851.9—1990
Printing Technology Terms
Printing Technology Terms
Printing Technology Terms
Part 1: Basic Terms
Part 7: Post-press Terms
Part 9: Post-press Terms.
GB/T7705—20084 Test results
The abrasion resistance of the ink layer and the printed surface after the wall layer is glazed is calculated according to formula (3). D
×100%
Wherein:
A, ink layer abrasion resistance;
D-average density value after the sample is rubbed;
D. Average density value before the sample is rubbed.
6.9 Highlight dot reproduction percentage
(3)
Take a sample (natural sample) printed with a printing control strip. The control strip should comply with the provisions of GB/T18720. Use a 20x to 50x magnifying glass to measure the highlight dot blocks of each color on the sample printing control strip. The percentage of highlight dots that can be seen is taken as the highlight dot reproduction percentage of the sample.
6.1050% dot gain value
6.10.1 Instrument
Reflection densitometer Same as 6.5.1 and 6.5.2.
6.10.2 Inspection steps
6.10.2.1 Take a sample (natural sample) printed with a printed control strip. The control strip should comply with the provisions of GB/T18720. 6.10.2.2 Use a reflective color densitometer that complies with the provisions of 6.5.1 and 6.5.2 to measure the solid block density value of any color on the sample printed control strip, and then measure the dot density value of the same color nominal coverage. 6.10.2.3 Then calculate the actual area coverage F (%) value of 50% dots of any color on the sample according to formula (4). Fp
In the formula:
1—10-DR
1-10-×100%
Actual area coverage of 50% dots of any color on a test specimen (%); Dv
Solid density value of any color;
DDot density value of the same color with a nominal coverage of 50%. 6.10.3 Test results
6.10.3.1 Calculate the 50% dot gain value AF of any color according to formula (5). AF =FD-50%
In the formula:
AF—50% dot gain value of any color;
·（4）
GB/T7705--2008
Fp——Actual area coverage of 50% dots of any color on a test specimen (%); 50% nominal coverage of the same color.
6.10.3.2 The maximum value among the dot gain values of each color of the sample shall be taken as the 50% dot gain value of the color of the sample. 7 Inspection rules
7.1 A group of unit products of the same variety, specification and production cycle with basically the same production conditions shall be a batch. 7.2 Sampling inspection shall be carried out in accordance with the provisions of the inspection sampling plan of GB/T2828.1. The sample unit is piece. The minimum number of samples for each batch is generally 5 pieces.
7.3 Determination of unqualified products: Each product shall be inspected in accordance with the provisions of this standard. If one or more technical indicators do not meet the requirements, the product shall be unqualified.
7.4 Determination of unqualified batches: Each batch of products shall be inspected in accordance with the provisions of this standard. If one or more of them are unqualified, double sampling shall be conducted for re-inspection. If there is still one or more unqualified products, the batch shall be unqualified. 8 Marking, packaging, transportation, compensation and storage
8.1 Marking
A qualified label should be affixed to the obvious part of each package, indicating the user unit, product name, variety and specification, quantity, manufacturer name, production date and inspector code, etc.
8.2 Packaging
Packaging and bundling in cartons or strong wrapping paper and strapping tape according to the contract requirements or the volume, quality and quantity of the product. 8.3 Transportation
Do not throw, smash or step on during transportation. It should be protected from moisture, sun exposure, rain, heat, heavy pressure, corrosive gas and liquid. 8.4 Storage
The storage environment requires ventilation and moisture, dust, sun protection, oil, mildew, corrosive gas, liquid, and no heavy pressure. The storage period is generally no more than 6 months from the date of production.
GB/T9851.1—2008
GB/T9851.7—2008
GB/T9851.9—1990
Printing Technology Terms
Printing Technology Terms
Printing Technology Terms
Part 1: Basic Terms
Part 7: Post-press Terms
Part 9: Post-press Terms.
GB/T7705—2008
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