Some standard content:
Light Industry Standard of the People's Republic of China
Vulanized fiber for the cotton yarn container
Subject content and scope of application
QB/T3502—1999
Replaces ZBY31002—1987
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage requirements of slivered fiberboard.
This standard applies to fiberboard made of base paper gelled with zinc chloride, which is used as slivered fiber in the textile industry. 2 Product classification
2.1 Slivered fiberboard is divided into two grades, A and B, according to quality. 2.2 The dimensions of sliver can steel paperboard are:
780mmX1200mm
1000mm X 1200mm
1330mm X1200mm
1500mmX1200mm
1860mm X 1200mm
870mm ×1200mm
1200mm X1200mm
1470mm X 1200mm
1630mmX1200mm
1980mmX1200mm
or as stipulated in the order contract. The dimensional deviation shall not exceed ±20mm. The deflection shall not exceed the following provisions:
According to the size specification, the deflection of the sliver tube below 1330mm×1200mm is 10mm, and the deflection of the sliver tube above 1470mm×1200mm is 15mm.
2.3 See Table 1 for thickness and deviation.
Indicator name
Thickness, mm
3 Technical requirements
3.1 The technical indicators of the sliver steel board must comply with the provisions of Table 2. Approved by the State Bureau of Light Industry on April 21, 1999
Strip steel paperboard
Implemented on March 1, 1999
Tensile strength
Indicator name
Vertical length not less than
Horizontal length not less than
Gluing coefficient not less than
Water absorption not more than
Ash content not more than
Zinc chloride content not more than
Delivery moisture
QB/T3502
—1999
Not less than
kN/cm2
(kgf/cm2)）
kN/cm2
(kgf/cm2)
(gf/cm)
6. 0~10.0
（306）
3.2 After heating the sliver steel paperboard at 100~105℃ for 24h and soaking it in warm water at 10~30℃ for 24h, there should be no cracking, bubbles or delamination.
3.3 The sliver steel paperboard should not crack or break when bent. 3.4 The sliver steel paperboard should have good mechanical cold processing properties and should not cause delamination and peeling during processing. The steel paperboard to be processed should be treated for 1~2 weeks at a relative humidity of 63%~~67% and a temperature of (20±2)℃ to keep its moisture content within the range of 6%~10%. 3.5 The surface of the sliver steel paperboard should be smooth, flat, clean and the edges should be neat. 3.6 The sliver steel paperboard should not have significant paper defects such as delamination, bubbling, transparency and skin breakage that affect its use. 3.7 The color of each batch of sliver steel paperboard should be consistent. 3.8 The article number, thickness, size and color of the sliver tube paperboard shall be specified in the order contract. 4 Test method
4.1 The sampling and pre-test sample treatment shall be carried out in accordance with GB/T450 "Method for sampling and pre-test sample treatment of paper and paperboard average".
4.2 The equilibrium time of the sliver tube steel paperboard shall not be less than 48h. 4.3 The tightness shall be measured in accordance with GB/T451 "Method for measuring the size, deflection, basis weight, thickness and tightness of paper and paperboard". 4.4 Determination of tensile strength
4.4.1 Take 3 samples in the longitudinal and transverse directions of the paperboard at a distance of 50mm from the edge of the sliver tube steel paperboard. 4.4.2 The size and shape of the sliver tube steel paperboard sample shall comply with the requirements of the figure below. 90F0
H-—Thickness of sample
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4.4.3 Test steps
QB/T 3502-1999
Measure the thickness of each part of the sample to an accuracy of 0.05mm, and take the average value of 5 points as the measurement result. 4.4.4 Place the prepared sample between the two clamps of the universal material testing machine and clamp it firmly. Apply tension at a load speed of 1470~1225kN (125~150kgf) per minute until the sample breaks. Record the applied tension and express the measurement result as the arithmetic average of three measured values.
4.4.5 CalculationbZxz.net
The tensile strength per unit cross section is calculated according to formula (1): Q=
Wherein; Q--tensile strength per unit cross section, N/cm2 (kgf/cm); P-tensile strength of the sample, N (kgf);
F-cross-sectional area of the sample before the test, cm.
: Calculate to an accuracy of 0.001N/cm2.
4.5 Determination of bonding coefficient
4.5.1 Three specimens of 100mm×30mm in length are cut longitudinally from the cardboard at a distance of not less than 50mm from the edge of the hard steel cardboard, and the bonding coefficient is determined on a tensile strength tester of not more than 294kN (30kgf). 4.5.2 Test steps
Place the sample in distilled water at (20±2)°C and soak for 24 hours. Take it out and peel off the middle part of one end of the sample with a knife tip. Then tear it 30mm by hand and clamp the two ends of the split on the upper and lower clamps of the tensile strength tester. The distance between the two clamps is 30mm. Then start the tensile machine and lower the lower clamp evenly until the pointer stops moving. The arithmetic mean of the three measured values is used to express the test result. 4.5.3 Calculation
Calculate the bonding coefficient according to formula (2):
Where: K——bonding coefficient, mN/cm;
F——adhesion, mN,
D——sample width, cm.
4.6 Determination of zinc chloride content
First, cut the hard steel cardboard sample into 2cm×2cm small pieces and weigh two 2.5g samples. Place one portion in an oven at 100-105°C and dry to constant weight. Place the other portion in a 250mL conical flask, then add about 150mL of distilled water, then add 2-4mL of 3% hydrogen peroxide, boil on an electric stove for about 15 minutes, pour the extract into a 250mL volumetric flask, then pour it into the conical flask containing the sample and add 150mL of distilled water (no hydrogen peroxide is added this time). After the second boiling for 15 minutes, mix the extracts in a 250mL volumetric flask, cool to 20°C, dilute to the mark, draw 50mL of the solution into a 150mL conical flask, add 0.4mL of 5% potassium chromate, and titrate with 0.01M silver nitrate solution until it turns orange-red. The zinc chloride content is calculated according to formula (3): zinc chloride content (%) = V×068 2×5×100w.
Where: V-
The volume of silver nitrate solution consumed, mL,
N—Molar concentration of silver nitrate solution, mol/L; W. --Mass of dry sample, g
0.0682——Conversion coefficient of zinc chloride.
(3)
4.7 Determination of skewness of cotton strip steel cardboard
The determination method of diagonal line: First, use a tape measure to measure the length of the horizontal left corner of the cotton strip steel cardboard and its diagonal opposite, and then use a tape measure to measure the length of the horizontal right corner of the cotton strip steel cardboard and its diagonal opposite. The error of the length of the two diagonal lines shall not exceed 10-15mm, that is, the skewness of the cotton strip steel cardboard is qualified.
5 Inspection rules
QB/T 3502—1999
Perform according to the provisions of GB/T2828 "Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection)". 5.1 The grouping order of the delivery test items and their inspection level and acceptable quality level (AQL) shall be as specified in Table 3: Table 3
Defect type
Major defect
Minor defect
Indicator name
Tensile strength
Zinc chloride content
Gluing coefficient
Water absorption
5.2 The unit product of the delivery test batch of cotton sliver tube steel paperboard is calculated by packaging unit and box paperboard. Inspection level
Acceptable quality level (AQI)
5.3 The secondary normal sampling inspection method is adopted. The sampling and processing of samples from the sample units shall be carried out in accordance with "(2) The sampling of average samples from each packaging unit" in GB/T450 "Methods for the sampling of average samples of paper and paperboard and the processing of samples before inspection". 5.4 The manufacturer must take effective measures to ensure that the quality of the paperboard meets the requirements of this standard. Each piece shall be accompanied by a certificate of conformity and a manual. When the consignee has doubts about the quality of the product, it has the right to inspect and accept it in accordance with the provisions of this standard, but the manufacturer shall be present during the sampling, and the entrustment of the inspection unit shall be agreed by both parties.
6 Marking, packaging, transportation and storage
6.1 The packaging and marking of cotton sliver steel paperboard shall be carried out in accordance with the provisions of QB/T45 "Paper Packaging and Marking". 6.2 Cotton sliver steel paperboard is packed in wooden boxes. With the consent of the user, wooden plywood packaging and soft packaging are allowed while ensuring the quality of the steel paperboard.
6.3 The weight of each piece is 200kg, 150kg or as specified in the order contract. 6.4 Each wooden box should be marked with: factory name, product name, product specifications, net weight, gross weight, production date, standard number, and the box should be marked with "Note moisture-proof" in large characters. 6.5 Cotton sliver steel paperboard should be kept in a dry place, and the relative humidity should be kept at 60%~70% and the temperature should be kept at 10~25℃. It should be placed on a dry floor or wooden rack to prevent it from being affected by atmospheric condensation and ground moisture. 6.6 Cotton sliver steel paperboard should not be close to walls and heat transfer systems. 6.7 Cotton sliver steel paperboard should be transported by canopied and clean transportation vehicles. 6.8 Packages should not be thrown down from high places.
Additional instructions:
This standard was proposed by the Paper Industry Bureau of the Ministry of Light Industry. This standard is under the jurisdiction of the Paper Industry Science Research Institute of the Ministry of Light Industry. This standard was drafted by Mudanjiang Steel Paper General Factory. From the date of implementation of this standard, the original Ministry of Light Industry standard QB368-1963 "Cotton sliver steel paperboard" will be invalid. 487
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