QB/T 1678-1993 Bleached kraft pulp

This standard specifies the technical specifications for bleached sulphate pulp. This standard applies to bleached sulphate pulp used for the manufacture of printing, writing, copying and other paper types. QB/T 1678-1993 Bleached sulphate pulp QB/T1678-1993 Standard download decompression password: www.bzxz.net

Light Industry Industry Standard of the People's Republic of China
Bleached sulphate pulp
1 Subject content and scope of application
This standard specifies the technical specifications for bleached sulphate pulp. This standard applies to bleached sulphate pulp used for the manufacture of printing, writing, copying and other paper types. 2 Reference standards
GB/T451.1 Determination of size and skewness of paper and paperboardGB/T740 Taking of pulp samples
GB/T1548 Determination of pulp viscosity
GB/T 2828
Counting sampling procedures and sampling tables for batch inspection (applicable to inspection of continuous batches) Determination of trifluoromethane extracts in pulp
GB/T 7979
GB/T 7980
GB/T 7981
GB/T 7982
Laboratory beatingValley beater methodPreparation of laboratory pulp sheetsConventional sheet former methodDetermination of physical properties of laboratory pulp sheetsGB/T 8940. 2
GB/T 8944. 1
GB/T 10739
Determination of pulp brightness
Determination of bulk sales quality of pulp Part 1: Standard atmosphere for handling and testing of pulp, paper and paperboard samples GB/T 10740
Determination of pulp dustiness
3 Product classification
QB/T 1678—1993
3.1 Bleached kraft pulp is codenamed B and is divided into coniferous wood (softwood) Br pulp and broadleaf wood (hardwood) By pulp according to tree species. 3.2 Br pulp and By pulp are divided into three grades according to quality: Br-A, Br-B, Br-C and By-A, By-B, By-C. 4 Technical requirements and test methods
4.1 The technical requirements and test methods for bleached kraft pulp shall comply with the provisions of Table 1. Approved by the Ministry of Light Industry of the People's Republic of China on March 28, 1993 306
Implemented on October 1, 1993
Indicator name
Mechanical strength!)
When the beating degree is 45°SR
The basis weight of the sheet is 60g/m2
Tensile index
Burst index
Tear index
Dichloromethane extract
Dust degree
0. 3~~1. 0mm2 Dust
1.0~5.0mm2Dust
More than 5.0mm2Dust
Delivery moisture
Indicator name
Mechanical strength 1)bZxz.net
When the beating degree is 45°SR
The basis weight of the sheet is 60g/m2
Tensile index
Burst index
Tear index
Dichloromethane extract
Dust degree
0. 3~1. 0mm2Dust
1. 0~5. 0mm2 dust
greater than 5.0mm2 dust
delivery moisture
not less than
not less than
not less than
not less than
not less than
not more than
not more than
not more than
not less than
not less than
not less than
not less than
not less than
not less than
not more than
QB/T 1678-1993
N·m/g
kPa·m2/g
mN·m2/g
cm°/g
mm 2/500g
N·m/g
kPa·m2/g
mN·m2/g
mm2/500g
85. 0 (92.7) | 00(7.10)
Not allowed
Test method
GB/T 7980
GB/T 7981
55.0(60.0）GB/T7982
3.00(3.10)
6.00(5.30)
Not allowed
GB/T 8940. 2
GB/T 1548
GB/T 7979
GB/T10740
GB/T 8944. 1
Test method
GB/T 7980
GB/T 7981
30.0(32.7)GB/T7982
50.0(54.5)40.0(43.6)
3.60(3.70)
6.50(5.80)
No Yes
3.00(3.10)
4.50(4.00)
2.50(2.60)
3.00(2.70)
GB/T 8940. 2
GB/T 1548
GB/T 7979
GB/T10740
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)℃. 307
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OB/T1678-1993
4.2 Bleached kraft wood pulp is a flat pulp board with the size of 720mm×880mm and 600mm×800mm. The measurement of pulp board size is carried out in accordance with the provisions of GB/T451.1. The size deviation shall not exceed ±5mm; the deflection shall not exceed 5mm. Pulp boards of other sizes may also be produced according to the contract.
5 Inspection regulations
5.1 The manufacturer shall ensure that the products produced meet the requirements of this standard. Each piece of this pulp shall be accompanied by a product certificate when it is delivered. 5.2 The quantity delivered at one time is regarded as a batch. The sampling for product acceptance inspection shall be carried out in accordance with GB/T2828. The sample unit is piece. The sampling quantity and the number of qualified judgments shall be as specified in Table 2.
Sampling plan
151~~3200
Normal inspection secondary sampling plan
Inspection level S-3
Class C non-qualified products
Class B non-qualified products
Sample size
AQL ama 6. 5
Non-qualified classification
Non-qualified
Tensile index
Burst index
Tear index
Dichloromethane extractable powder
Dust degree
Non-qualified
Submission score
5.3 During sampling inspection, the external packaging of the sample should be checked first, and then the sample should be taken for inspection. The sampling and treatment of the sample before inspection shall be carried out in accordance with the provisions of GB/T740 and GB/T10739. 5.4 The mechanical strength, difluoromethane extract, viscosity and dustiness of the pulp shall be measured with a mixed sample of the sample. If it fails to meet the standards, it can be measured again. If it still fails to meet the standards, it shall be judged as a batch failure. 5.5 The purchaser has the right to inspect the product in accordance with 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 results still fail 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 results meet the requirements of this standard, it shall be judged as a batch failure and the purchaser shall be responsible for handling it. 6 Marking, packaging, transportation and storage
6.1 Wood pulp is packaged in flat pulp bags, and the weight of each pulp bag shall not exceed 220kg. 6.2 Each piece of pulp should be packed with 150-200g/m2 wrapping paper or two layers of similar pulp board, and tightly packed with iron wire of no less than No. 12 in the shape of "and".
6.3 The surface of each piece of wood pulp must be clearly marked with product name, trademark, number, air-dried weight, grade, inspector, production date, manufacturer name, etc. for identification.
6.4 Pulp bags should be properly kept to prevent rain, snow and ground moisture.6.5 Transportation should be carried out by means of transportation with clean seams. It can also be transported by open wagons, but must be covered with a rag to prevent rain and snow from wetting the finished products.
6.6 Do not drop pulp bales from heights when transporting or stacking. 308
Additional Notes:
QB/T1678—1993
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 Standard Promotion Center. This standard was drafted by the Tianjin Light Industry Paper Technology Research Institute and Nanping Paper Mill. The main drafters of this standard are Feng Wenxin, Wan Guoguang, Ma Qinglan, Lu Lingfang, and Miao Junying. From the date of implementation of this standard, the former Ministry of Light Industry standard QB758~-1980 "Bleached Kraft Pulp" will be invalidated. 309
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