This standard specifies the technical specifications for cast-coated white paperboard. This standard applies to cast-coated paperboard made from white paperboard, and is mainly used for medium and high-end packaging boxes for printed goods. This standard does not apply to cast-coated paper made from paper or cardboard of different weights. QB/T 3504-1999 Cast-coated white paperboard QB/T3504-1999 Standard download decompression password: www.bzxz.net

Light Industry Standard of the People's Republic of China
Cast-coated white paperboard
Subject content and scope of application
This standard specifies the technical specifications for cast-coated white paperboard. QB/T 3504—1999
Replaces ZBY31005—1989
This standard applies to cast-coated paperboard that is cast-coated with white paperboard as the base paper, and is mainly suitable for medium and high-end packaging boxes for printed goods. This standard does not apply to cast-coated paper that is cast-coated with different quantitative paper or cardboard as the base paper. 2 Reference standards
GB/T 450 Paper and paperboard sampling
Determination of size and deflection of paper and paperboardGB/T 451.1
GB/T451.2 Determination of basis weight of paper and paperboardGB/T 457
Determination of folding endurance of paper
GB/T 462
GB/T 1541
GB/T 1543
Determination of moisture content of paper and paperboard
Determination of dust content of paper and paperboard
Determination of opacity of paper (paper backing)
GB/T 2679.3
GB/T 2679.5
GB/T 2828
GB/T 3331
GB/T 7974
Determination of stiffness of paper and paperboard
Determination of folding endurance of paper and paperboard (MIT folding endurance tester method)Batch inspection counting sampling procedure and sampling table (applicable to inspection of continuous batches)Determination of printed surface strength of paper and paperboardDetermination of whiteness of paper and paperboard (diffuse/vertical method)GB/T 8940. 1
GB/T 8941. 1
GB/T 10341
Determination of whiteness of paper and paperboard: (45/0 directional reflection method)Determination of specular gloss of paper and paperboard (20° angle measurement method)Determination of printed surface strength of paper and paperboard (electric type)GB/T 10342
Paper packaging and marking
3 Product classification
3.1 Cast-coated white paperboard is divided into three grades: A, B and C. 3.2 Cast-coated white paperboard is flat paper with specifications of 880mmX1230mm, 850mm×1168mm, 787mm×1092mm or as specified in the order contract. The size deviation shall not exceed ±3mm and the deflection shall not exceed 3mm. 3.3 Colored cast-coated white paperboard can be produced according to the order contract. 4 Technical requirements
4.1 The technical indicators of cast-coated white paperboard 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
Gloss
Indicator name
Not less than
Surface strength of printing
Ink absorption
Transverse stiffness
220g/m2
250g/m2
280g/m2
310g/m2
350g/m2
Transverse folding endurance
Folding endurance of coating at 180°
Dust degree
0.1~0.7mm2
More than 0.7~2. 0mm2
greater than 2.0mm2
delivery moisture
not less than
not less than
not less than
not more than
QB/T3504—1999
220±11.0
250±12.5
280±14.0
310±15.5
350±17.5
83.0~95.0
no crack
no
7.0±2. 0 | |tt | 0
220±13.0bzxZ.net
250±15.0
280±17.0
310±19.0
350±21.0
76.0~~90. 0
No cracks
No
Note: As the domestic testing instruments and equipment for printing surface strength and ink absorption have yet to be solved, the two technical indicators for B and C products are temporarily suspended. The paper surface should be flat and free of curling that affects use. 4.2
4.3 The color tone of each batch of paperboard should not be significantly different. The whiteness of colored paperboard is not assessed, and its color should comply with the paper sample specified in the order contract. 4.4 The cutting edges of the paper should be neat and clean, and there should be no folds, damage, spots, obvious streaks, or paper defects such as coating pits that affect use. If there is a dispute over coating pits, the assessment shall be carried out according to Appendix C. 4.5 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. 4.5.1
The quantitative value exceeds the allowable error range by less than 2%. The whiteness is lower or higher than the standard range by less than 2% (absolute value). The glossiness is lower than the standard by less than 2% (absolute value). 4.5.3
Transverse stiffness is less than 5% of the standard.
Dustiness is less than 20% of the standard.
5 Test method
5.1 Quantitative determination shall be made in accordance with GB/T451.2. 5.2 Whiteness shall be determined in accordance with GB/T7974 or GB/T8940.1. In case of any dispute, GB/T7974 shall prevail. 5.3 Glossiness shall be determined in accordance with GB/T8941.1. 5.4 Ink absorption shall be determined in accordance with Appendix A. 497
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QB/T 3504--1999
5.5 Printing surface strength shall be determined in accordance with GB/T3331, using domestic low-viscosity roughening oil. 5.6 Stiffness shall be determined in accordance with GB/T2679.3. 5.7 The folding resistance shall be measured in accordance with GB/T457 or GB/T2679.5 (spring tension 9.8N). In case of dispute, any method that is qualified shall be deemed qualified.
5.8 The folding resistance of the coating shall be measured in accordance with Appendix B. 5.9 The pitting of the coating shall be measured in accordance with Appendix C. 5.10 The dustiness shall be measured in accordance with GB/T1541. 5.11 The moisture content of delivery shall be measured in accordance with GB/T462. 6 Inspection rules
6.1 The manufacturer shall ensure that the cast-coated white paperboard produced meets the requirements of this standard. Each piece of paper shall be accompanied by a certificate of conformity when it is delivered. 6.2 Product delivery inspection and sampling inspection shall be measured in accordance with GB/T2828, and the sample unit is piece. 6.3 The sampling of samples shall be measured in accordance with GB/T450. 6.4 The qualified quality level (AQL) shall be calculated according to the defective rate, and the counting sampling plan shall be as specified in Table 2. 6.5 The user has the right to inspect the batch according to this standard. If there is any objection to the batch quality, the manufacturer should be notified within three months after arrival for joint re-inspection. If it does not meet the requirements of this standard, it shall be judged as a batch failure and the manufacturer shall be responsible for handling it. Table 2
Sampling plan
Batch, piece
1~25
26~90
91~280
281~500
Second normal sampling inspection level 1
Class B nonconforming products
Sample size
13(26)
Marking, packaging, transportation, storage
7.1 Carry out according to the provisions of GB/T10342 or the provisions of the order contract. Class C non-conforming products
Classification of non-conforming products
Class B non-conforming products
Glossiness
Printing surface strength
7.2 Use a canopied and clean transport vehicle for transportation. Do not drop paper from a high place during transportation. 7.3 Products should be properly stored to prevent the influence of rain, snow and ground moisture. 498
Class C unqualified
Ink absorbency
Transverse folding endurance
Coating folding endurance
Coating pits
Dust degree
Delivery moisture
A1 Sample
QB/T 3504-1999
Appendix A
Ink absorbency determination method
(Supplement)
Sampling shall be carried out in accordance with the provisions of GB/T450, and the samples shall be processed and tested under the standard atmospheric conditions specified in GB/T10739. A2 Test instruments and equipment
A2.1 Ink absorbency determination instrument with ink distribution device and ink wiping device. A2.2 Standard absorption ink and ink wiping paper.
A2.3 The reflectance photometer complies with the requirements of GB/T1543. A3 Test steps
A3.1 Cut 60mm×150mm samples uniformly from different parts of the transverse paper width, with the long side of the sample being the longitudinal direction. A3.2 Place the sample flat on the glass surface of the instrument's inking device, and then place a 0.1mm thick metal plate with a 43mm×43mm opening flat on the sample.
A3.3 After stirring the standard absorption ink evenly, use an ink scraper to scrape the ink from the opening of the metal plate, and start the timer at the same time. A3.4 Remove the metal plate, and an ink layer of about 0.1mm thickness will form on the paper surface. Place the sample with the ink layer on the ink wiping device of the instrument, and start the instrument to scrape off the ink layer on the paper after 2 minutes.
A3.5 Place the sample with the ink layer on the surface wiped off on the back of the same sample until it is opaque, and place it on an instrument that meets the requirements of GB/T1543 to measure the green light diffuse reflection factor of the inked area and the un-inked area, and then calculate the ink absorption by the following formula, expressed as a percentage. (R.-R)×100+K
Ink absorption=
Where: R—green light diffuse reflection factor of the inked area of ​​the sample; R,—green light diffuse reflection factor of the un-inked area of ​​the sample; R
K—correction coefficient of standard absorption ink.
A3.6 Measure at least 3 test pieces from the samples drawn from each packaging unit, and report the measurement results as the arithmetic mean of the ink absorption of the tested pieces, rounded to 0.1%.
Appendix B
Determination of folding resistance of coating
(Supplement)
B1 Test specimen
Sampling shall be carried out in accordance with the provisions of GB/T450, and the specimen shall be processed and tested under the standard atmospheric conditions specified in GB/T10739. B2 Test apparatus and equipment
B2.1 Metal roller with a width of 50mm and a weight of (5±0.2)kg. 499
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B3 Test steps
QB/T3504—1999
B3.1 Cut at least 3 test pieces of 200mm×70mm, with the long side of the test piece in the longitudinal direction. B3.2 Fold the test piece in half longitudinally with the coating side facing outward, and then roll the folded part once with the metal roller to form a crease perpendicular to the longitudinal direction on the test piece. When rolling, the roller axis is parallel to the indentation, and the rolling direction is that the roller rolls down from the sample. B3.3 In the folded state, observe whether the coating breaks at the fold, repeat the operation for at least 3 test pieces, and if there is no coating breakage at the fold of the test piece, it means "no breakage", and the index is judged to be qualified. Appendix C
Determination of coating pits
(Supplement)
C1 Test sample
Sampling according to the provisions of GB/T450.
C2 Test instrument
A stereo microscope with an eyepiece micrometer, select a magnification of 40, calculate the area of ​​the field of view, and express it in cm2. C3 Test steps
C3.1 Cut at least 10 test pieces of about 50mm×50mm at equal distances along the full width of the horizontal direction of the paper sample. C3.2 Place the test piece on the stage of a stereo microscope that meets the requirements of C2. After adjusting the focal length, use the eyepiece micrometer to count the number of pits within the specified size range in the field of view. Randomly measure a part of each test piece and calculate the number of pits in the coating K in pieces/cm2 using the following formula. K
Where: Q——Number of pits counted in each field of view, pieces; Q
Field of view area, cm2.
C3.3 Measure not less than 10 test pieces per packaging unit and report the measurement results with the arithmetic mean and standard deviation of the measured values, rounded to integers, in pieces/cm2. The number of pits of 0.05-0.1mm shall not exceed 80/cm2; the number of pits of 0.1-0.5mm shall not exceed 20/cm2; and the number of pits larger than 0.5mm shall not be allowed. The size of the pit is expressed by its length. For small pits connected to each other, the size is expressed by the length of the combined whole.
Additional Notes:
This standard was proposed by the Paper Industry Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Paper Standardization Center. This standard was drafted by the Tianjin Paper Research Institute and the West Plant of Shandong Paper Factory. The main drafters of this standard are Zhang Jingyan, Han Huizhu, Wang Li, Gao Rui, and Lou Linlin. 500
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