This standard specifies the technical specifications for cast-coated paper. This standard applies to cast-coated paper that is cast-coated with different weights of paper or cardboard as the base paper, and is mainly used for printing art cards, book covers, self-adhesive labels and high-end packaging boxes for goods. This standard does not apply to cast-coated white paperboard that is cast-coated with white paperboard as the base paper. QB/T 3518-1999 Cast-coated paper QB/T3518-1999 Standard download decompression password: www.bzxz.net

Light Industry Industry Standard of the People's Republic of China
Cast-coated paper
1 Subject content and scope of application
This standard specifies the technical specifications of cast-coated paper. QB/T 3518—1999
Replaces ZBY32017—1989
This standard applies to cast-coated paper that is cast-coated with different quantitative paper or cardboard as the base paper, and is mainly used for printing art cards, book covers, self-adhesive trademarks and high-end packaging boxes for goods. This standard does not apply to cast-coated white paperboard that is cast-coated with white paperboard as the base paper. 2 Reference standards
GB/T450 Paper and paperboard sampling
GB/T 451.2 Determination of paper and paperboard basis weight GB/T457
Determination of paper folding endurance
GB/T 462
GB/T 1541
GB/T 1543
Determination of water content of paper and paperboard
Determination of dust content of paper and paperboard
Determination of paper opacity (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
GB/T 10342
3Product classification
Determination of whiteness of paper and paperboard45/0 directional reflection methodDetermination of specular gloss of paper and paperboard20° angle determination methodDetermination of printed surface strength of paper and paperboard (electric type)Paper packaging and marking
3.1 Cast-coated paper is divided into three grades: A, B and C.
3.2 Cast-coated paper is divided into two types: flat paper and roll paper. 3.3 The specifications of flat paper are 880mm×1230mm, 850mm×1168mm, 787mm×1092mm or as specified in the order contract. The size deviation shall not exceed ±3mm and the skewness shall not exceed 3mm. 3.4 Specifications of roll paper
The specifications of roll paper shall be produced in accordance with the order contract. The width deviation shall not exceed ±5mm. 3.5 Colored cast-coated paper may be produced in accordance with the order contract. 4 Technical requirements
The technical indicators of cast-coated paper must comply with the provisions of Table 1. 4.1
Approved by the State Bureau of Light Industry on April 21, 1999
Implemented on March 1, 1999
Indicator name
Glossiness (20° angle)
Ink absorption
Printing surface strength
Transverse stiffness
180g/m2
220g/m2
250g/m2
280g/m2
Transverse folding resistance
180~280g/m2
Coating folding resistance 180°
Dust degree
0. 1~~0. 7mm2
greater than 0.7~2.0mm2
greater than 2.0mm2
delivery moisture
QB/T3518-1999
not less than
not less than
not less than
not less than
not more than
piece/m2
220±11.0
250±12. 5
280±14.0
83.0~95.0
18.0~30.0
No rupture
Not allowed
180±1 1.0
220±13.0
250±15.0
280±17.0
80.0~~90.0
18.030. 0
No crack
No
180±11.0
220±13.0
250±15.0
280±17.0
78. 0~~90. 0
18.0~30.0
No crack
No
Note: As the domestic testing instruments and equipment for printing surface strength and ink absorption have yet to be solved, the implementation of these two technical indicators for products B and C is temporarily suspended. 4.2 The paper surface should be flat, without curling that affects use. 4.3 The color tone of each batch of paper should not be significantly different. The whiteness of colored paper is not controlled, and its color should conform to the paper sample specified in the order contract. 4.4 The cutting edge of the paper shall be neat and clean, without folds, damage, spots, obvious streaks and coating pits that affect the use. If there is any dispute about the coating pits, the assessment shall be carried out according to Appendix C.
4.5 The following conditions shall be classified as second-class products, but no more than two of them shall be exceeded 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). 4.5.2
The glossiness is lower than the standard by less than 2% (absolute value). The transverse stiffness is lower than the standard by less than 5%.
4.5.5 The dustiness exceeds the standard by less than 20%. 554
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5Test method
QB/T 3518-1999
The quantitative value shall be determined in accordance with the provisions of GB/T451.2. 5.2 Whiteness shall be measured in accordance with GB/T7974 or GB/T8940.1. In case of any dispute, GB/T7974 shall prevail. 5.3 Glossiness shall be measured in accordance with GB/T8941.1. 5.4 Ink absorption shall be measured in accordance with Appendix A. 5.5 Printing surface strength shall be measured in accordance with GB/T3331, using domestic low-viscosity roughening oil. 5.6 Stiffness shall be measured in accordance with GB/T2679.3. 5.7 Folding resistance shall be measured in accordance with GB/T457 or GB/T2679.5 (spring tension 9.8N). In case of any dispute, any method that is qualified shall be considered qualified.
5.8 Folding resistance of coating shall be measured in accordance with Appendix B. 5.9 Coating pits shall be measured in accordance with Appendix C. 5.10 Dust degree shall be measured in accordance with GB/T1541. Delivery moisture shall be measured in accordance with GB/T462. 5.11
6 Inspection rules
6.1 The manufacturer shall ensure that the cast-coated paper produced meets the requirements of this standard, and each piece of paper shall be accompanied by a certificate of conformity when delivered. 6.2 Product delivery inspection and sampling inspection shall be carried out in accordance with the provisions of GB/T2828, and the sample unit is piece. 6.3 The sampling and pre-inspection treatment of the sample shall be measured in accordance with the provisions of GB/T450 and GB/T10739. 6.4 The acceptable quality level (AQL) shall be calculated based on the defective product rate, and the counting sampling plan shall be as specified in Table 2. Table 2
Sampling plan
Batch, piece
91~280
281~500
Sample size
13(26)
Secondary normal sampling inspection level 1
Class B nonconforming products
Class C nonconforming products
Classification of nonconformity
Class B nonconformity
Glossiness
Printing surface Strength
Class C unqualified
Ink absorption
Transverse folding endurancewww.bzxz.net
Coating folding endurance
Coating pits
Dust
Delivery moisture
6.5 The user has the right to accept 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 should be judged as a batch unqualified and the manufacturer shall be responsible for handling it. 7 Marking, packaging, transportation, storage
7.1 Carry out according to the provisions of GB/T10342 or the provisions of the order contract. 7.2 During transportation, a canopy and clean transportation tool should be used. During transportation, paper pieces are not allowed to be thrown from a high place. 7.3 The product should be properly stored to prevent the influence of rain, snow and ground moisture. 555
A1 Test specimen
QB/T3518—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 surface after 2 minutes.
A3.5 Place the sample with the surface layer 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 formula (A1) and express it as a percentage. (R.R),
Ink absorption (%) =
X100-+K
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; K—correction factor 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 the standard. B2 Test apparatus and equipment
Metal roller with a width of 50mm and a weight of (5±0.2)kg. 556
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B3 Test procedure
QB/T 3518--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 the longitudinal direction with the coating surface facing outward, and then roll the folded part with a metal roller once to form a crease perpendicular to the longitudinal direction on the test piece. When rolling, the axis of the roller is parallel to the indentation, and the rolling direction is that the roller rolls down from the sample. B3.3 Observe whether the coating breaks at the folding position in the folded state, repeat the operation for at least 3 test pieces, and if there is no coating breakage at the folding points of the test pieces, it is considered "no breakage", and the index is considered qualified. Appendix C
Determination of coating pits
(Supplement)
C1 Test specimen
Sampling is carried out in accordance with 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 centimeters?. C3 Test steps
C3.1 Cut at least 10 test pieces of about 50mm×50mm at equal distances along the entire horizontal width of the drawn 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, count the number of pits within the specified size range in the field of view with the help of the eyepiece micrometer. Measure a random location on each test piece and calculate the number of pits K in the coating using formula (C1), expressed as pieces/cm2. K:
Where: Q—the number of pits counted in each field of view, pieces; 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 pieces/cm2; the number of pits of 0.1~0.5mm shall not exceed 20 pieces/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. 557
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