Some standard content:
Light Industry Standard of the People's Republic of China
Relief printing paper
1 Subject content and scope of application
This standard specifies the technical specifications of relief printing paper. This standard is applicable to relief printing paper for books, documents and magazines. 2 Reference standards
GB/T 450 Paper and paperboard sampling
GB/T451.1 Determination of size and skewness of paper and paperboardDetermination of basis weight of paper and paperboard
GB/T 451.2 Determination of thickness of paper and paperboard
GB/T 451.3
GB/T 453
GB/T 456
GB/T 457
GB/T 460
GB/T462
GB/T 1541
GB/T 1543
GB/T 2828
Determination of tensile strength of paper and paperboard (constant rate loading method)Determination of smoothness of paper and paperboard (Buick method)Determination of folding endurance of paper
Determination of sizing degree of paper and paperboard (ink streaking method)Determination of moisture content of paper and paperboard
Determination of dust content of paper and paperboard
Determination of opacity of paper (paper backing)
Batch inspection counting sampling procedure and sampling table (applicable to inspection of continuous batches)GB/T 8940.1
Determination of whiteness of paper and paperboard 45/0 directional reflection methodGB/T10342
Paper packaging and marking
3 Product classification
3.1 Letterpress printing paper is divided into three grades: B, C, and D. 3.2 Letterpress printing paper is available in two types: flat paper and roll paper. QB/T 3524—1999
Replaces ZBY32026—1990
3.3 Paper size
3.3.1 The size of flat paper is 880mm×1230mm, 787mm×1092mm, 850mm×1168mm, the size deviation is not allowed to exceed ±3mm, and the skewness is not allowed to exceed 3mm.
3.3.2 The width of roll paper is 880mm, 787mm, 850mm, the width deviation is not allowed to exceed ±3mm, and the roll diameter is (800±50)mm. 3.3.3 Other sizes of paper can be produced according to user needs. 4 Technical requirements
4.1 The technical indicators of letterpress printing paper must comply with the provisions of Table 1. Approved by the State Bureau of Light Industry on April 21, 1999
Implemented on March 1, 1999
Opacity
Smoothness
Indicator name
52g/m2
60g/m2
70g/m2
Average of front and back
Difference of front and back
Breaking length
Roll (vertical)
Flat plate (vertical and horizontal average)
Gluing degree
Folding endurance average of vertical and horizontal
Dust degree
0.3~2. 0mm2
Of which 1.0～2.0mm2 black
Greater than 2.0mm2
Delivery moisture
Not greater than
Not less than
Not less than
Not less than
Not greater than
Not less than
Not less than
Not less than
Not less than
Not less than In
No more than
QB/T3524--1999
pieces/m2
No
No
No
No
The paper surface should not have any appearance paper defects that affect printing, such as sand, hard blocks, folds, wrinkles, various streaks, spots, light spots, cracks4.2
and holes visible to the naked eye. There should be no paper scraps, residual sheets, damage, or corners in the flat paper. 4.3 The paper should not have print-through and obvious hair loss or powder loss during the printing process. 4.4
The cut edges of the paper should be neat and clean.
The paper should be flat and the fiber structure should be uniform. 4.5
Each batch of paper shall not have obvious color difference, and the whiteness (%) difference of the same batch of paper shall not exceed 4.4.6
The height difference of the flat paper stack shall not exceed 5%. The joints of each roll of paper shall not exceed 6.
Paper defects that are not easy to find inside the roll paper, such as inconspicuous folds, wrinkles, streaks, spots, light spots, holes, etc., shall not exceed 1.5%. 4.9
Those with the following conditions shall be classified as second-class products, but no more than two items shall be included at the same time. a.
Quantity exceeds the allowable deviation within ±1.0g/m2; Break length is less than the specified 10%;
Opacity is less than the specified 2%;
Whiteness difference of the same batch of paper exceeds the allowable range within 1.0%; Whiteness is less than the specified 2.0%;
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Dust degree exceeds the specified 15%;
Smoothness value is less than the specified 5s;
Smoothness difference exceeds the specified 5%;
QB/T3524-—1999
Full-width height difference of flat paper stack is greater than 5% and less than 10%; Roll joints exceed the specified 2 or less.
5 Test method
5.1 The sampling of samples shall be carried out in accordance with the provisions of GB/T450. 5.2 The test of paper size and skewness, basis weight and tightness shall be carried out in accordance with the provisions of GB/T451.1, GB/T451.2 and GB/T451.3. 5.3 The test of whiteness shall be carried out in accordance with the provisions of GB/T8940.1. 5.4 The test of opacity shall be carried out in accordance with the provisions of GB/T1543. 5.5 The test of smoothness shall be carried out in accordance with the provisions of GB/T456. 5.6 The test of breaking length shall be carried out in accordance with the provisions of GB/T453. 5.7 The test of sizing degree shall be carried out in accordance with the provisions of GB/T460 and the "Paper for ink penetration and diffusion comparison board\third line". 5.8 The test of dust degree shall be carried out in accordance with the provisions of GB/T1541. 5.9 The test of folding endurance shall be carried out in accordance with the provisions of GB/T457. 5.10 The test of moisture shall be carried out in accordance with the provisions of GB/T462. 5.11 When determining the internal paper defects of the roll paper, take 10 layers of the outer periphery of the roll, remove the outer 5 layers, and cut the remaining 5 layers into 0.05m2 paper pieces (not less than 100 pieces), and then select the paper pieces with paper defects or measure the total area (m2) of the 5 layers of paper divided by 0.05m2 as the number of sample paper pieces, and then check the number of paper defects (each paper defect is calculated as a sample paper piece). The internal paper defect rate X (%) is calculated according to formula (1): X-
Where: N-the number of paper pieces with paper defects;
M-the number of test paper pieces.
The calculation result is rounded to 0.1%
5.12 The full-width height difference of a flat paper stack (%) is calculated according to formula (2): The full-width height difference of a flat paper stack = the full-width maximum height of the paper - the full-width minimum height of the paper probe × 100 × the full-width maximum height of the paper stack
6 Inspection rules
6.1 The quantity delivered at one time is considered a batch, but not more than 50t. 6.2 The manufacturer shall ensure that the paper produced meets the requirements of this standard, and each piece of paper shall be accompanied by a product certificate. (1)
（2）
6.3 Sampling inspection for delivery inspection is carried out in accordance with the provisions of GB/T2828. The sample unit for flat paper is piece, and for roll paper is roll. The sampling plan for delivery inspection is as specified in Table 2.
Batch, piece (roll)
Sampling plan
91～280
QB/T3524
Normal secondary sampling plan
Inspection level I
Class B nonconforming products
Sample size
Class C nonconforming products
Nonconforming classification
Nonconforming
Smoothness
Opacity
Rip length
Nonconforming
Gluing degree
Folding endurance||tt ||Dust degree
Appearance Paper defects
6.4 The collection of average samples in each packaging unit and the treatment of samples before inspection shall be carried out in accordance with the provisions of GB/T450 and GB/T10739.
7 Marking, packaging, transportation, storage
7.1 The packaging of flat paper shall be carried out in accordance with the provisions of GB/T10342. 7.1.1 It shall be packed in plywood.wwW.bzxz.Net
7.1.2 The paper shall be accompanied by a product certificate, and the plywood shall be marked with product name, quantity, paper size, net weight of paper, product grade, production date, manufacturer and moisture protection. 7.2 The packaging of roll paper shall be carried out in accordance with the provisions of GB/T10342, and the following supplementary provisions shall be made. 7.2.1. The roll paper should be rolled on a dry and hard paper core. The length of the paper core must be consistent with the width of the paper roll, with an error of no more than ±1mm. The wall thickness of the paper core should not be less than 10mm. The inner diameter of the paper core should be 75~~80mm. There should be no flattening or cracking. 7.2.2 The roll paper should be tight, with uniform tightness across the entire width. The end surface of the roll should be flat, without obvious bows or sawtooth shapes. 7.2.3 Except when the paper is rolled (within 2cm from the paper core), no debris such as scraps of paper and paper strips should be rolled into the roll. 7.2.4 The joints must be firmly bonded, flat, and straight, and the remaining paper tails should be neatly cut off. The width of the joints should not exceed 30mm, and no adhesion to another layer of paper is allowed. The joints should be clearly marked. 7.2.5 The roll must be accompanied by a product certificate, and the end surface of the roll should have product name, quantity, width, roll number, roll net weight, product grade, production date, manufacturer, and signs such as prevent moisture and do not use hooks. 7.3 Paper should be properly stored to prevent it from being affected by sunlight, rain, snow and ground moisture. 7.4 Clean covered cartons should be used for transportation. If uncovered cartons are used for transportation under special circumstances, they must be covered with rainproof cloth. 7.5 Paper must not be dropped from a height during transportation and stacking. 7.6 Paper rolls must not be rolled on gravel or uneven ground during transportation and stacking. Additional notes:
This standard was proposed by the Paper Industry Division of the Ministry of Light Industry. This standard is under the jurisdiction of the National Paper Standardization Center. This standard was drafted by Jincheng Paper Factory. From the date of implementation of this standard, the former Ministry of Light Industry standard QB24-1972 "Letterpress Paper" will be abolished. This standard refers to the Soviet standard TOCT9095-1973 "Letterpress Paper". 580
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