This standard applies to paper used for offset multi-color printing of nautical charts. GB/T 2676-1981 Nautical chart paper GB/T2676-1981 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China This standard applies to paper used for offset multi-color printing of nautical charts. 1. Classification 1.1 Nautical charts are flat sheets. GB 2676-81 1.2 Paper size: 787×1092mm, 787×1260mm, the size error shall not exceed ±3mm, and the skewness shall not exceed 3mm. Other sizes of paper can be produced according to the requirements of the ordering party. 2 Technical requirements
2.1 The technical indicators of the travel drawings must meet the following requirements: Indicators
1. Basis weight, g/m2
2. Tightness, g/cm2
3. Breaking length, m
Vertical and transverse average
4. Folding endurance, number of reciprocating times
Vertical value
5. Gluing degree, mm
6. Self-smoothness, %
7. Smoothness, S
Front and back average
8. Moisture, %
9. Wet strength, %
10. Shrinkage (after soaking), %www.bzxz.net
11. Abrasion resistance, times
12 0g
150g
12.Dust degree (measured by maximum length), pcs/m20.25~1.5mm dust
Black dust larger than 1.0mm
Dust larger than 1.5mm
General Administration of Standards
Ministry of Light Industry of the People's Republic of China
Not less than
Not less than
Not less than
Not less than
Not less than
Not less than
Not less than
Not less than
Not less than
Not more than
120± 4
150±5
Not allowed
Not allowed
Test method
GB 451—79
GB 451-79
GB453—79
GB457---79
GB 460--79
GB1542—79
GB456—79
GB 452—79
GB 465—79
GB 459—79
August 1, 1981
GB 2676. -- 81
2.2 The fiber structure of paper should be uniform and the paper surface should be flat. 2.3 The cut edges of paper should be neat and clean.
2.4 The color of each batch of paper supplied shall not have significant differences. 2.5 When printing, the paper shall not have obvious hair loss or powder loss. 2.6 The paper surface shall not have folds, wrinkles, hard blocks, glossy and matte streaks, spots, translucent spots, cracks, and holes visible to the naked eye under reflected light.
2.7 The following conditions shall be classified as second-class products, but no more than two of them shall be exceeded at the same time. 2.7.1 The quantitative value exceeds the specified value by ±2g/m2. 2.7.2 The dust content exceeds the specified value by 20%, and the number of 1.0~1.5mm black dust or 1.5~2.0mm dust shall not exceed 3 per sheet.
2.7.3 The smoothness is less than 20% of the specified value. 2.7.4 The tear length is less than 5% of the specified value. 3 Test method
3.1 Abrasion resistance test method
3.1.1 Sampling and processing: According to GB450-79 "Methods for taking average samples of paper and paperboard and processing samples before inspection". 3.1.2 Applicable reagents and instruments
a. Drawing ink;
b. Shaving blade with a thickness of 0.08-0.13mm; C. Drawing eraser.
3.1.3 Inspection process
Take a 200×200mm sample, first draw a line with a width of 1.5mm with drawing ink, then carefully erase the line with a 0.08-0.13mm thick shaving blade and eraser, and then draw a line of the same width with ink at the same position. The line should not have burrs or diffusion.
4 Acceptance rules
4.1 The quantity delivered at one time is considered as a batch, but not more than 30 tons. 4.2 The manufacturer shall ensure that the paper produced meets the requirements of this standard. Each piece of paper shall be accompanied by a certificate of conformity when it is delivered. 4.3 The user has the right to check whether the quality of the batch of products meets the requirements of this standard. During the inspection, the external packaging shall be checked first, and then samples shall be taken from them for inspection. 4.4 If the inspection results do not meet the requirements of this standard, samples shall be taken from double the number of paper pieces, and the indicators that do not meet the requirements of the first sample shall be re-inspected. If the re-inspection results show that only one piece of paper does not meet the requirements, the entire batch of paper shall be listed as unqualified products, and the manufacturer shall be responsible for handling it.
4.5 The sampling of samples and the handling of samples before inspection shall be carried out in accordance with the provisions of GB450-79. 5 Packaging and marking
5.1 Every 250 sheets shall be packed into small packages with kraft paper or paper bag paper with a basis weight of not less than 60g/m2. Each package of paper shall be accompanied by a paper selection card. 5.2.1 120g 787×1092mm, 4 reams per piece 5.2.2 150g 787×1092mm, 3 reams per piece 5.2.3 120g 787×1260mm, 3.5 reams per piece 5.2.4 150g 787×1260mm, 2.5 reams per piece 5.3 Wrap the paper in small packages into large packages according to the specified number of reams with three layers of 80g paper bags, put a piece of moisture-proof paper and yellow board paper on the top and bottom, and use wooden clips that meet the standard requirements. 5.4 The lead wire used for punching is 10*.
5.5 After punching, a certificate of conformity shall be affixed to each piece of paper, and the production date shall be noted and the longitudinal direction of the paper shall be marked on the plywood. 6 Transportation and storage
6.1 Paper shall be properly stored to prevent the influence of rain, snow and ground moisture. 39
GB2676-81
6.2 During transportation, a canopy and clean transportation vehicle shall be used. 6.3 Paper shall not be dropped from a height.
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