This standard applies to paper decorative printed products produced by offset lithography. GB 7705-1987 Offset lithography GB7705-1987 Standard download decompression password: www.bzxz.net
This standard applies to paper decorative printed products produced by offset lithography.

National Standard of the People's Republic of China
The offset lithographic prints for decorating
This standard applies to paper decorative prints produced by lithographic offset printing. 1 Product classification
GB 7705—87
1.1 Fine products: high-grade decorative prints produced by high-quality printing materials and refined plate technology, with quality meeting all the indicators of fine products.
1.2 "General products: other decorative prints except fine products. 2 Technical requirements
2.1 Appearance
2.1.1 Clean, without obvious dirt or incompleteness. 2.1.2 The text is printed clearly and completely, and the meaning of the words is not misunderstood if the font size is smaller than 5. 2.1.3 Obvious bars are not allowed.
2.1.4 The net pattern is clear and uniform; there is no obvious deformation or defect. 2.2 Finished product specification error
2.2.1 The error of cutting finished products shall comply with the provisions of Table 1. Table 1
Finished picture
363X516 (4 and below)
363X516 (4 and below) ) or more
2.2.2 The error of die-cut finished products shall comply with the provisions of Table 2. Table 2
Finished pictures
129×181 (32 open) and above
129×181 (32) and above
2.2.3 The position deviation of the finished pattern with symmetry requirements shall comply with the provisions of Table 3. Table 3
City pictures
129×184 (32 open) and below
129×184 (32 open) and above
Approved by the Ministry of Light Industry of the People's Republic of China on April 30, 1987 Limit error
Limit error
±0: 5
Limit error
1987-10-01 implementation
2. 3 Overprint error shall comply with the provisions of Table 4 Overprint position
Beach position"
Major position
GB 7705-87
Fine production
Note: 1) The major position refers to the part of the screen that reflects the theme, such as patterns, text, logos, etc. 2.4 The requirements for solid printing shall comply with the provisions of Table 5. Table 5
Indicator name
Density deviation of the same color
Color difference of the same color in the same batch
Glossiness of ink layer 11
CTEr'α*\
Gs (60)
, 1) This indicator can be cancelled for products without glossiness requirements. 2.5 Requirements for screen printing
2.5.1 The percentage of normal small dots shall not be less than 5%. 2.5.250% dot enlargement value shall comply with the provisions of Table 6. Index name
Indicator value
Fine product
≤.4.00
Fine product
50% dot enlargement value (F)
3 Test method
3.1 Test requirements
3.1.1 The test room temperature shall be 23±2℃ and the relative humidity shall be 50%±5%. Standard
General product
L* 50. 00
General product
≤18%
3.1.2 Sample treatment: According to the conditions of 3.1.1, place it in an environment without ultraviolet light for no less than 8 hours.3.1.3 Light source: D standard push light source with a color temperature of 5500~6500K. The light source is about 800mm away from the sample table. 3.2 Appearance
Put the sample under the light source specified in 3.1.3, and the observer's eyes are about 400mm away from the visual part. Visual identification, 3.3 Finished product specification error
3.3.1 Cutting finished product and die-cutting finished product specification error Take the finished product sample, measure its length (accurate to 0.5mm) at the part with specified size, and the difference with the specified size is the finished product specification error.
3.3.2 Finished product pattern position error
Measure the blank width of any symmetrical part of the sample on the left and right (up and down) (accurate to 0.1mm), and then calculate according to the following formula: Finished product pattern position error three
Where dd?
The width of the symmetrical blank part of the sample, mm.
3.4 ​​Overprint error
3.4.1 Light source: opposite to 3.1.3.
GB 7705--87
3.4.2 Instrument: 20 times scale microscope, precision is 0.01mm. 3.4.3 Test steps: Under the light source of 3.4.1, test the overprint error between any two colors in the main part and the secondary part of the sample at three points respectively. Take the average value, which is the overprint error of the main part and the secondary part. 3.5 Density deviation of the same color
3.5.1 Instrument: Use a reflective color densitometer with 68, 47 and 25 guide color filters and infrared color filters, with an accuracy of less than or equal to 10.02D.
3.5.2 Use of color filters
The color to be measured is black, H or gray. Use infrared color filter 3- 5.2. 1
The color to be measured is a primary color. Select the color filter according to Table 7. 3.5.2.2
Measured color
Raden No. 58
Raden No. 47
Raden No. 25
Selection of color filters
3.5.2.3 If the measured color is a combination of two or more primary colors, the color filters listed in Table 7 should be selected respectively. 3.5.3 Test steps
3.5.3.1 During the test, the background is the primary color.
3.5.3.2 Select the color filter according to 3.5.2 based on the measured color. Color
3:5.3.3 Use a standard white board to calibrate the instrument so that the color saturation value is equal to the value specified on the primary board, accurate to ±0.021). Select one color filter and calibrate one time.
3.5.3.4 For finished products with a format less than or equal to 129mm×184mm (32 open), one point is measured at each of the four corners and the center of the same color on the same sample. For finished products with a format greater than 129mm×184mm (32 open), five additional points are measured on the same sample. 3.5.4 Test results
3.5.4.1 The deviation of the same color density of each sample is calculated as follows: (DD,)
The first measured same color density:
The number of measurements;
——The average value of the same color density.
3.5.4.2 Compare the average value of the density deviation of the same color of each color, and take the largest value as the density deviation of the same color of the sample. 3.6 Color difference of the same color in the same batch
3.6.1 Instrument: Use an integrating sphere colorimeter, which should comply with the provisions of Chapter 3 of GB3979·83 "Measurement Method of Object Color". The standard illumination body is 1, the maximum field of view of the color measurement is 10°, and the "CIF1964 Supplementary Standard Colorimetric Observer Data" is used. 3-6-2 The measurement area is generally a circular hole with a diameter of 25mm. If the measured part is small, a small area observation hole is allowed, and its area shall not be less than 25mm.
3.6.3 Sample steps: Take the standard sample as the reference, first measure the 1.\n*\ value of the CIEL*aB* average color space, and then measure the color difference between the sample and the same color and the same part of the base.
3.7 Glossiness of ink layer
3.7.1 Instrument
GH 770587
3.7.1.1 The gloss meter shall include a light source and a lens, which can project parallel light or slightly convergent light beams onto the surface to be measured. The gloss meter shall also include a receiver, which has a lens field grating and a photocell for receiving the required reflected light cone. The optical path is shown in Figure 1. Light source
Color temperature color film
Light transmission assembly
Light source light
When entering the appropriate time
Receiver
Receiving light bar
Equal positive color film
Receiving condition
3.7.1.2 Geometric conditions: The incident light is arranged at 60° + 0.5° with the vertical line of the surface to be measured (6). The axis of the receiver should coincide with the image of the incident light axis. If a flat polished black glass is placed in place of the test plate, the image of the light source should fall on the center point of the receiver's field of view grating. The width of the light spot on the test plate should not be less than 1 μm. The angle (8\) between the axis of the receiver light and the perpendicular to the surface being measured should be equal to the corresponding deviation for the same incident light angle. 3.7.1.3 Light source: Use CTE standard light source or [light source. 3. Instrument calibration
3.7.2.1 The working standard sample is made of ceramic tile, porcelain, matte glass or other materials with uniform gloss, and the surface must be smooth. A gloss meter must be equipped with a primary standard sample and a working standard sample. The samples must be calibrated regularly, and their working characteristics should be uniform and stable. 3.7.2.2 The gloss meter must be calibrated at the beginning of each test phase and at regular intervals during the test.To ensure that the instrument's response is basically consistent. When calibrating, first adjust the instrument to zero, then enable it to correctly display the gloss of the higher gloss secondary standard sample, then place the working standard plate to read the lower gloss, and the total reading should not differ from the value specified in the standard by more than 1 dioptric unit.
3.7.3 Test steps
3.7.3.1 The test sheet must be flat and wrinkle-free. 3.7.3.2 Measure the surface of different color layers of the sample separately. Measure three points for the color area within 100cm, and five points for the area greater than 100cm.
3.7.3.3 When the gloss difference of each color measurement result of each sample is greater than 5 units, add double the test points. 3.7.4 Test results
Calculate the average glossiness of the same color at each point of the sample as the glossiness of the sample at that position 3.8 Normal small dot percentage www.bzxz.net
GB7705-87
Take a sample (natural sample) with a quality detection signal strip [see Appendix A (Supplement)], and use a 20x magnifying glass to self-test the small valve dot block on the quality detection signal strip on the sample. The percentage of normal dots that can be seen is the index value. 3.950% dot enlargement value
3.9.1 Instrument: Color densitometer is the same as 3.5.1. 3.9.2 Use of color filter is the same as 3.5.2.
3.9.3 Test steps
3.9.3.1 Take a sample (natural sample) with a quality detection signal strip (see Appendix A). 3.9.3.2 Select the color filter on the quality inspection signal strip of the sample according to the method in 3.5.2 to measure the density value D of 50% dots of one color coarse screen (12 lines/cm). Then measure the density value 1f of 50% dots of the same color fine screen (60 lines/cm). Calculate the dot enlargement value F by the following formula:
F=(DD,) ×100%
The maximum value among the dot enlargement values ​​of each color of the sample is taken as the dot enlargement value of the product. 4 Inspection rules
4.1 A group of unit products of the same variety and delivered at the same time with basically the same production conditions is a batch. 4.2 The number of samples for each batch is generally 5.
4.3 Defective product judgment: Each product is tested for the various technical indicators required by the product according to the test method in Chapter 3. If one or more technical indicators fail to meet the requirements, the product is a defective product. 4.4 Determination of unqualified batches: For each batch of products, 5 pieces shall be randomly inspected according to the random sampling table or stratified sampling method. If one or more of them are unqualified products, double sampling and retesting shall be carried out. If there are still one or more unqualified products, the batch shall be unqualified. 5 Marking, packaging, transportation, storage
5.1 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, factory date and inspector code.
5.2 Packaging
Package and bundle with firmer packaging paper according to user requirements or according to the volume and quantity of the product. 5.3 Transportation
Throwing, smashing and stepping are not allowed during transportation. Pay attention to moisture, exposure, heat, heavy pressure and corrosion gas and liquid. 5.4 Storage
The storage environment should be moisture-proof, sun-proof, oil-proof, anti-corrosive, and gas-proof. It cannot be heavily pressed. The storage period is generally 6 months. GB770587
Appendix A
Quality Inspection Signal Guide Requirements
(Supplement)
41The quality inspection signal strip should be printed on the printing plate at the same time as the printed pattern. The most suitable position is the empty trailing end of the printed sheet, as shown in Figure A1.
42The quality inspection signal strip for each set of dot printing consists of a dot pattern of 9 small squares of 5mm×5mm. A2.1The first block is a solid.
42.2The second block is a 50% square dot coarse screen with 12 lines/cm. 42.3 The third block is composed of 50% of 60 lines/cm square dots of different sizes, which are composed of dots and yin and yang points. A2.4 The fourth part is composed of 6 small blocks, each block is composed of 0.5%, 1%, 2%, 3%, 4%, and 5% dots of 60 lines/cm. Bite
Placement calculation
Additional instructions:
This standard is proposed by the Packaging and Printing Joint Corporation of the Ministry of Light Industry of the People's Republic of China. This standard is under the jurisdiction of the Packaging Science Research Institute of the Ministry of Light Industry of the People's Republic of China. This standard was drafted by Shanghai Packaging and Decoration Industry Company and others.
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