This standard specifies the product classification, technical requirements, inspection methods, inspection rules and marking, packaging, transportation and storage requirements of kraft paper. This standard is applicable to kraft paper used to package various commercial items. QB/T 3516-1999 Kraft paper QB/T3516-1999 Standard download decompression password: www.bzxz.net

Light Industry Standard of the People's Republic of China
Kraft Paper
Subject Content and Scope of Application
QB/T3516--1999
Replaces ZBY32014-1988
This standard specifies the product classification, technical requirements, inspection methods, inspection rules and requirements for marking, packaging, transportation and storage of kraft paper. This standard applies to kraft paper used to package various commercial items. 2 Product Classification
2.1 Kraft paper is divided into three grades: A, B and C.
2.2 Kraft paper is divided into double-sided kraft paper and single-sided kraft paper. Double-sided kraft paper is divided into calendered and non-calendered. 2.3 The color of kraft paper shall be specified in the order contract. 2.4 Kraft paper is divided into flat paper and roll paper. 2.5 Paper size
2.5.1 Flat paper: 787mm×1092mm, 889mm×1194mm or as specified in the order contract. Deviation shall not exceed ±3mm, and skewness shall not exceed 3mm.
2.5.2 Roll paper: Roll width shall be as specified in the order contract, and width deviation shall not exceed ±5mm. 3 Technical requirements
3.1 The technical indicators of kraft paper must comply with the requirements of Table 1. Table 1
Indicator name
Blanket resistance
Not less than
40g/m2
50g/m2
60g/m2
70g/m2
80g/m2
(kgf/cm2)
Approved by the State Bureau of Light Industry on April 21, 1999
110(1. 1)
1999-03-01Implementation
Indicator name
Burst resistance
Not less than
Tear strength Longitudinal
Not less than
Gluing degree
Delivery moisture
90g/m2
100g/m2
120g/m2||tt ||40(g/m2)
50(g/m2)
60(g/m2)
70(g/m2)
80(g/m 2)
90(g/m2)
100(g/m2)
120(g/m2)
is not greater than
QB/T 3516--1999
Continued Table 1
(kgf/cm2)
315(32)
470(48)
630(64)
785(80)
980(100)
1180( 120)
1320(135)
1470(150)
265(27)
410(42)
540(55)
660(67)
765(78)
885(90 )
980(100)
1230(125)
6.0~~10.0
355（3.6)
145(15)
245(25)
365(37)
490（50)
590(60)
705(72)
805(82)
1030(105)
3.2 Other quantitative kraft paper can be produced according to the order contract, and its physical strength index can be calculated by the insertion method based on the strength index of the adjacent standard quantitative paper.
3.3 Kraft paper should be made of sulfate pulp or other chemical pulp with similar strength as the main raw material. 3.4 The fiber structure uniformity and color of the paper shall conform to the paper sample specified in the order contract. The color of each batch of colored kraft paper shall not be significantly different.
5 The paper surface shall be flat and shall not have folds, wrinkles, defects, spots, cracks, holes and other paper defects. 3.5
3.6 Single-sided kraft paper shall be glossy and shall not have dull streaks. 3.7 The paper cutting edges shall be neat and clean.
3.8 Non-periodic internal paper defects of the roll that are not easy to find during the rewinding process shall be inspected in accordance with Article 5.4 of this standard and shall not exceed 3%. 3.9 Those with any of the following conditions may be classified as second-class products, but no more than two of them shall be included at the same time. 3.9.1 The quantitative value exceeds the standard error by less than 2%; the longitudinal tear strength is less than the specified value by less than 10%; 3.9.2
The bursting strength is less than the specified value by less than 10%.
Test method
4.1 Quantity
Measured in accordance with GB/T 451 "Determination of size, skewness, quantity, thickness and tightness of paper and paperboard". 4.2 Burst resistance
Measured in accordance with GB/T 454 "Determination of burst resistance of paper". 4.3 Tear resistance
Measured in accordance with GB/T455 "Determination of tear resistance of paper and paperboard". 4.4 Sizing
Measured in accordance with GB/T1540 "Determination of sizing of paper and paperboard" (surface absorption weight method) for 60s. 4.5 Moisture
QB/T 3516-1999
Measured in accordance with GB/T462 "Determination of moisture content of paper and paperboard". 5 Inspection rules
5.1 The quantity delivered at one time is considered as a batch, but it shall not exceed 30t. 5.2 The manufacturer shall ensure that the paper produced meets the requirements of this standard, and each batch of paper shall be accompanied by a certificate of conformity. 5.3 The sampling inspection of the delivery test shall be carried out in accordance with the provisions of GB/T2828 "Batch-by-Batch Inspection Count Sampling Procedure and Sampling Table (Applicable to Inspection of Continuous Batches)". The sample unit is piece or tube.
The grouping order of the delivery test items and their inspection level and qualified quality level (AQL) shall be as specified in Table 2. Table 2
Defect Type
Major Defect
Minor Defect
Test Item
Burst Resistance
Tear Strength
Gluing Degree
Sampling Plan
Second Normal
Sampling Plan
Inspection Level
Acceptable Quality Level (AQL)
5.4 When measuring paper defects inside the roll, take five layers from the inside of the roll with more than ten layers, cut into 0.05m2 paper pieces, and then select the paper pieces with paper defects and weigh them, and calculate the percentage of the sample. 5.5 If the user has any objection to the batch quality, he should notify the manufacturer within six months. The supply and demand parties shall jointly take samples for inspection. If the inspection result is unqualified, it will be judged as a batch unqualified and the manufacturer shall be responsible for handling it. 6 Marking, packaging, transportation, storage
6.1 Follow the provisions of QB/T45 "Paper Packaging and Marking", and make the following supplements. 6.2 Paper roll weight: roll diameter or paper sheet length shall be in accordance with the order contract, and the deviation of paper sheet length shall not exceed +20m. 6.3 The roll bow shall not exceed 15mm, and the serration shall not exceed 5mm. 6.4 There shall be no more than 4 broken ends per roll, and the broken ends shall be connected well and marked clearly. 6.5 If there are special requirements, it can be in accordance with the order contract. 6.6 Paper should be properly stored to prevent it from being affected by rain, snow and ground moisture. 6.7 During transportation, an efficient and clean means of transportation should be used. Paper rolls or paper pieces are not allowed to be dropped from a height. 6.8
Additional instructions:
This standard is proposed by the Papermaking Bureau of the Ministry of Light Industry. This standard is under the jurisdiction of the Papermaking Industry Science Research Institute of the Ministry of Light Industry. This standard was drafted by Tianjin Xinhua Paper Mill. From the date of implementation of this standard, the original QB706-1979 "Kraft Paper" will be invalid. This standard refers to the American UU-P-268G1973 "Unbleached Kraft Packaging Paper Standard". 549
Defect type
Major defect
Minor defect
QB/T3515-1999
Test items
Ink absorption
Shrinkage
Water absorption
Wet strength
Breaking length
Tear strength
Aging resistance
Double pulp group
Dust
Appearance paper disease
Inspection level
Acceptable quality level (AQL)
5.5 The purchaser has the right to accept the product according to the requirements of this standard. During the inspection, first check the outer packaging, and then conduct sampling inspection according to the regulations. If the purchaser has any objection to the product quality, he/she may raise it to the manufacturer within one month after the arrival of the goods. The two parties will jointly sample and re-test. If it does not meet the requirements of this standard, it will be judged as a batch failure and the manufacturer will be responsible for handling it. 6 Marking, packaging, storage, and transportation
6.1 The finished product must have a factory number, indicating the place of origin, factory name, date, specification, trademark and moisture-proof mark. 6.2. Paper for export is wrapped with moisture-proof paper and packed into export cartons. Paper for domestic sale is wrapped with linseed oil or moisture-proof paper and finally wrapped with jute bags. The above packaging is called one piece. The packaging method agreed upon by both parties can also be adopted. 6.3 Paper should be stored properly to prevent it from being affected by rain, snow and ground moisture. 6.4 During transportation, a canopy and clean transportation vehicle should be used, and paper should not be dropped from a height. 6.5 If the storage and transportation do not comply with the provisions of the standard, resulting in the deterioration or quality decline of the product and not complying with the provisions of this standard, the relevant parties shall be responsible.
Four-foot single
Heavy four-foot single
Four-foot type
Four-foot two-layer
Four-foot three-layer
Leather four-foot single
Leather cotton connected
Five-foot single
Five-foot type
Five-foot two-layer
Five-foot three-layer
Leather five-foot single
Six-foot single
Six-foot type
Six-foot two-layerwww.bzxz.net
Six-foot blue layer
Eight-foot piece
Wen Erxuan
Zhangliu (Luhuang)
1) Can be supplied according to order requirements.
QB/T 3515-1999
Appendix A
Specifications of common varieties
(Supplement)
Size, cm
69.0X138.0
84.0X153.0
97.0X180.0
79.0×109.0
124.2X248.4
144.9X 367. 5
193.2X503.7
Weight of each knife, kg\)
Allowable difference of each knife,
—105
—120
—250
—2100
—10000
QB/T3515—1999
Appendix B
Number of samples drawn and number of batch quality judgments
(Supplement)
5The acceptable quality level (AQL) for minor defects is 0
Acceptable quality level for major defects (AQL) is 6.5R
According to S-4 inspection level
Second normal sampling
Batch range, force
91~150
151~280
281~500
501～1200
1201~3200
320110000
Qualified judgment number;
Defective products-a unit commodity with one or more defects is a defective product, which is divided into serious defective products and minor defective products. R. —Defective judgment number;
Additional instructions:
This standard is proposed by the Leather Cultural Products Bureau of the Ministry of Light Industry. This standard is drafted by the Xuan Paper Professional Standard Drafting Group. 546
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