This standard specifies the technical specifications for unbleached sulphate softwood pulp. This standard applies to unbleached sulphate softwood pulp used in the manufacture of kraft paper, boxboard, tube paper, plastic lining paper, packaging paper and paperboard. QB/T 1679-1993 Unbleached sulphate softwood pulp QB/T1679-1993 Standard download decompression password: www.bzxz.net

Light Industry Industry Standard of the People's Republic of China
Unbleached sulphate coniferous pulp
Subject content and scope of application
This standard specifies the technical specifications for unbleached sulphate coniferous pulp. QB/T 16791993
This standard applies to unbleached sulphate coniferous pulp used in the manufacture of kraft paper, boxboard, tube paper, plastic lining paper, packaging paper and paperboard.
2 Reference standards
GB/T451.1 Determination of size and skewness of paper and paperboardTaking of pulp samples
GB/T 740
Determination of the Kappa number of pulp
: GB/T 1546
GB/T 2828
GB/T 7980
GB/T 7981
GB/T 7982
Batch inspectionCount sampling procedures and sampling tables (applicable to inspection of continuous batches)Laboratory beatingValley beater methodPreparation of laboratory pulp sheetsConventional sheet former methodDetermination of physical properties of laboratory pulp sheetsDetermination of the mass sales quality of pulpPart 1: Pulp boardsPulp balesGB/T 8944.1
GB/T 10739
Standard atmosphere for handling and testing of pulp, paper and paperboard samples GB/T 10740
Determination of dustiness of pulp
3 Product classification
Unbleached coniferous kraft pulp is divided into three grades: A, B and C according to quality. 4 Technical requirements and test methods
4.1 The technical requirements and test methods for unbleached coniferous kraft pulp shall comply with the requirements of Table 1. Table 1
Indicator name
Mechanical strength 1)
When the beating degree is 45°SR
The basis weight of the sheet is 60g/m2
Tensile index
Burst index
Tear index
Not less than
Not less than
Not less than
N·m/g
kPa·m2/g
mN·m\/g
Approved by the Ministry of Light Industry of the People's Republic of China on March 28, 1993 310
95.0(104)
7. 00(7. 20)
13.0(11.6)
80. 0(87. 2)
6.30(6.50)
12.0(10.7)
68.0(74. 1)
4.50(4.64)
11.0(9.80)
Test method
GB/T 7980
GB/T 7981
GB/T 7982
Implemented on October 1, 1993
Kappa number
Dust degree
Indicator name
Impurities of 1.0~～5.0mm2
Impurities larger than 5.0mm
Fiber bundles of 1.5~5.0mm2
Fiber bundles larger than 5.0mm2
Delivery moisture
No more than
No more than
No more than
QB/T1679—1993
Continued Table 1
mm*/500g
35.0±4.00
Not allowed
Not allowed
35.0±5.00
Not allowed
Not allowed
35.0±8.00
Not allowed
Not allowed
Test method
GB/T 1546
GB/T 10740
GB/T 8944.1
Note: 1) The data in brackets of the mechanical strength index are the values ​​processed and measured under the conditions of relative humidity (50±2)% and temperature (23±1). 4.2 The mechanical strength index of pulp using larch as raw material shall not be less than 90% of the value specified in Table 1. 4.3 If required, pulp of other hardness can be produced according to the contract, but the allowable deviation shall be consistent with the standard provisions. 4.4 Unbleached kraft coniferous pulp is a flat pulp board with a pulp board size of 720mm×880mm and 600mm×800mm. The measurement of pulp board size shall be carried out in accordance with the provisions of GB/T451.1, and the size deviation shall not exceed ±5mm, and the deflection shall not exceed 5mm. Pulp boards of other sizes may also be produced according to the contract provisions, and the size deviation requirements are the same as above. 4.5 The color of the same batch of pulp boards shall be basically the same. 5 Inspection rules
5.1 The manufacturer shall ensure that the products produced meet the requirements of this standard, and each piece of wood pulp shall be accompanied by a product certificate when delivered. 5.2 The number of deliveries is considered as a batch, and the sampling of product delivery inspection shall be carried out in accordance with GB/T2828. The sample unit is piece, and the sampling quantity and qualified judgment number shall be as specified in Table 2.
Sampling plan
151~3200
Normal inspectionSecondary sampling plan
Inspection level S-3
Class B nonconforming products
Sample size
Class C nonconforming products
Nonconforming classification
NonconformingwwW.bzxz.Net
Tensile index
Burst index
Tear index
Dust degree
Nonconforming
Kappa value
Delivery moisture
5.3 During sampling inspection, the external packaging of the sample should be checked first, and then samples should be taken from it for inspection. The sampling and treatment of the samples before inspection shall be carried out in accordance with the provisions of GB/T740 and GB/T10739. 5.4 The mechanical strength and dustiness of the pulp shall be measured by the mixed sample of the sample. If it fails to meet the requirements, it can be measured again. If it still fails to meet the requirements, it shall be judged as a batch failure.
5.5 The purchaser has the right to inspect the product according to the provisions of this standard. If the purchaser has any objection to the quality of the product, it shall notify the supplier within three months after the arrival of the goods for joint re-inspection. If the re-inspection result still fails to meet the requirements of this standard, it shall be judged as a batch failure and the supplier shall be responsible for handling it. If the re-inspection result meets the requirements of this standard, it shall be judged as a batch failure and the purchaser shall be responsible for handling it. 311
6 Marking, packaging, transportation and storage
QB/T 1679-1993
6.1 The wood pulp shall be packaged in flat pulp bags, and the weight of each pulp bag shall not exceed 220kg. 6.2 Each piece of wood pulp shall be packaged with 150-200g/m2 of packaging paper or two layers of the same pulp board, and tied tightly in a well shape with iron wire of not less than No. 12.
6.3 The surface of each piece of wood pulp must be clearly marked with the product name, trademark, number, air-dried weight, grade, inspector, production date, name of the manufacturer, etc. for identification.
6.4 Pulp bales should be properly stored and strictly protected from rain, snow and ground moisture. 6.5 During transportation, it should be transported in a canopy and clean means of transportation. It can also be transported in a canopy-less carriage, but it must be covered with a quilt to prevent rain and snow from wetting the finished product.
6.6 During transportation and stacking, pulp bales must not be dropped from a height. Additional remarks:
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 Nanping Paper Mill and Tianjin Light Industry Paper Technology Research Institute. The main drafters of this standard are Wan Guoguang, Feng Wencui, Lu Lingfang, Zhang Huiying and Li Haian. From the date of implementation of this standard, the former Light Industry Ministry Standard QB757-1980 "Unbleached Kraft Pulp" shall be invalid.
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