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Mechanical Industry Standard of the People's Republic of China
JB/T9554
1999-08-06
Wa Xian Ji Dong
2000-01-01
JB/T9554
This standard is a revision of ZBK15019-89 "Electrical Polyester Nonwoven Fabrics". Compared with ZBK15019-89, this standard only revised its writing format, and the standard name was changed to "Electrical Polyester Nonwoven Fabrics". The technical content has not changed:
The standard is based on the actual situation. This standard was proposed and approved by the National Technical Committee for Standardization of Insulating Materials. The drafting unit of this standard is Sichuan Erfang Insulating Materials Co., Ltd. The drafters of this standard are Tian Zengqi, Cheng Zhaogou and Zhang Zhiyong. This standard was first issued on March 28, 1989 and revised for the first time in 1999. This standard is entrusted to the National Technical Committee for Standardization of Insulating Materials for interpretation. Scope
JB/T95541999
ZBK1501989
This standard specifies the performance requirements, test methods, inspection rules, marking, packaging, transportation and storage of nonwoven fabrics with channel fibers for electrical use (hereinafter referred to as nonwoven fabrics). This standard applies to nonwoven fabrics made of high-strength low-stretch cotton-type polyester fibers and thermally bonded polyester fibers by hot-rolling bonding. 2 Classification and naming According to different web methods, nonwoven fabrics can be divided into two types: a) 7030 type nonwoven fabrics are made by air-laid web method, and the fiber distribution is random; b) 7031 type nonwoven fabrics are made by mechanical carding web method, and the fiber distribution is random; for orientation. 3 Requirements
3.1 Appearance
The surface of the nonwoven fabric should be even and flat, and the roll should be neatly rolled without damage or pollution; cotton knots, fiber bundles, etc. within the original deviation range are allowed. 3.2 Size
3.2.1 Nonwoven fabrics are supplied in rolls, each roll has a diameter of not less than 250mm, each roll has no more than three sections, and the smallest section is not less than 100m. Each section is clearly marked.
3.2.2 The width of the nonwoven fabric is 1020+5mm or 1010±5mm, which can be cut into widths of 15±1mm, 20±1mm, 25±1mm30±2 mm50±2 mm 3.2.3 The thickness and allowable deviation of nonwoven fabrics shall comply with the provisions of Table 1. Table 1 Thickness and allowable deviation of nonwoven fabrics
Nominal thickness
Example
Average value
Individual value
±0010
3.2.4 Nonwoven fabrics of other sizes may be specified in the contract. 3.3
Physical and mechanical properties
The physical and mechanical properties of nonwoven fabrics shall comply with the requirements of Table 2.
1999-08-06
2000-01-01
Quantitative loss
Table density
Tensile strength
Expansion
Heat shrinkage 150℃,
N/50m
0.55 ± 0.10
Quantitative loss User can select expansion reference and provide measured data. Table 2 Physical and mechanical properties of nonwoven fabrics 7030
Nominal thickness
0.60 ± 0. 10
0.65±0.10
Nominal friction
0.70±0.10
JB/T9554
4 Test method
4.1 Sampling
JB/T9554
Remove at least one outer layer from the unrolled end of the product, and then cut a sample with a width equal to the product width and a length of at least 1500mm: 4.2 Appearance
Observe and evaluate.
4.3 Size
4.3.1 Roll diameter, measured with a steel ruler.
4.3.2 Width, measured with a steel ruler, accurate to [mm. 4.3.3 Thickness and allowable deviation
4.3.3.1 On the sample taken in 4.1, use a 100mm×100mm sample with a side length of 0.2mm to cut five samples at equal distances along the same horizontal line at a distance of 10mm from the side, and then cut five samples at an interval of 500mm in the longitudinal direction in the same way, for a total of 15 samples
4.3.3.2 The thickness is measured using a static weight gauge with an accuracy of 0.001mm, a measuring head diameter of 6mm, and a constant test pressure of 7N. 4.3, 3.3 The approximate center point of each sample is connected during measurement. 4.3.3.4 The method for measuring the thickness of nonwoven tape is to measure one point at intervals of about 100 mm along the longitudinal direction of the tape, for a total of 15 points. 4.3.3.5 The test results are calculated according to the following formula:
Difference (average value) = aa
Deviation (individual value) = amn-a (or mx-a) Where: a-average thickness, mm;
-thickness at the actual measuring point, mm:
a-nominal thickness, mm:
anin (or a)-minimum (or maximum) value of the actual measuring point, mm; n-number of specimens, the calculated result shall be rounded to three decimal places.
4.4 Quantification
4.4.1 15 specimens shall be cut according to 4.3.3.1. 4.4.2 The sample should first be treated at 23±2℃ and relative coagulation 50%±5% for 24h, and then weighed with a balance under the same conditions, accurate to 0.001. If there is no dispute, the test can be carried out at room temperature. 4.4.3 The test results are calculated according to the following formula:
Where: X, the sample weight, gm*:
F,——the area of the sample, mm:
G——the mass of the sample, g:
x—average weight, g/m2;
Number of samples
JB/T95541999
Take the average weight of 15 samples as the test result, and take one decimal place. 4.5 The quantitative unevenness rate [CV]
The quantitative unevenness rate is calculated as follows:
cv=x100
Where: S——standard deviation;
CV——quantitative unevenness rate, %;
x—quantity of each sample, m;
x average quantitative, m, take the result calculated in 4.4.3: n number of samples.
Calculation result is rounded to the integer.
46 The apparent density is calculated as follows:
p=1000
Where: p——apparent density, g/m;
x——average quantitative, g/m2. Take the result calculated in 4.4.3; a-—half-average thickness, mm, take the result calculated in 4.3.3.5. The result should be rounded to two decimal places.
4.7 Tensile strength and elongation at break
4.7.1 From the sample taken in 4.1, take five specimens of 200 mm in length and 50 ± 0.11 mm in width in the longitudinal and transverse directions. The transverse direction is cut along the longitudinal center line, and the longitudinal direction is cut along the ellipse width. The distance between the specimens should be roughly equal. The distance between the specimens on both sides should be at least 10 mm from the edge. 4.7.2 The longitudinal distance between the nonwoven tape specimens and the length of the tape should be about 1001 mm. Take one, the center line of the belt is the center line of the sample, take five in total, the sample length is 2001mm, the sample width is 50±0.1mm when the half width is greater than 50mm: when the bandwidth is less than 50mm, cut according to the bandwidth 4.7.3 Select a tensile testing machine with a reading accuracy of 1% of the index value specified in the product standard, the distance between the two beams is 100+1m, and the moving speed of the fire tool during measurement is (100±10)mm/min: 4.7.4 When the sample breaks, record the load and length. If the sample breaks at the center or in the fixture, the test is invalid and another sample should be weighed.
4.7.5 The tensile strength is the arithmetic mean of the loads at break of five tests, in N/50mm width. For non-woven tapes with a width less than S011m: the measured tensile strength should be converted to a value of 50mm width first, and then the arithmetic mean is calculated: the calculation result is rounded to the integer. 4.7.6 The elongation at break is calculated according to the following formula: Www.bzxZ.net
Where: 8 -
Elongation at break, %:
ALx100
JB/T95541999
△I Absolute elongation of the sample at break, mm: L, effective length of the sample (distance between clamps), mm. The arithmetic mean of the tests on each sample is taken as the test result, and the result is rounded to the integer. 4.8 Thermal shrinkage
4.8.1 Use the samples collected in 4.1 and place them in a natural state under tension at room temperature for 24 hours. 4.8.2 Take five specimens of 150 mm in length and 10 ± 0.5 mm in width along the longitudinal and transverse directions, not less than 10 mm from the two edges of the specimen. Draw a thin line with a pen about 25 mm from one end of the specimen: the thin line is perpendicular to the length of the specimen. Take this line as the reference and add 100 ± 0.5 mm of the sample at 100 ± 0.5 mm.Draw a thin line at 5nm. The two lines should be parallel to each other. The distance between the two lines is the effective length. 4.8.3 Hang the sample in a constant temperature electric oven at 150±2℃, keep it for 1h, then take it out, cool it to room temperature, and measure the effective length between the two cuts with a steel ruler with a graduation value of 0.5mm. 4.8.4 The test results are calculated according to the following formula:
Where: Mountain heat shrinkage, %:
L\—Effective length of the sample before baking, Ⅱm; L, effective length of the sample after baking, mm.=12×100
Take the arithmetic mean of five sample tests as the test result, and take the integer. 5 Inspection rules
5.1 Nonwoven fabrics should be subjected to type inspection and mountain inspection. 5.2 Type inspection includes all the properties of this standard and is carried out at least once every two months of production. When the raw materials or processes are changed, type inspection is also required.
5.3 The inspection of each batch of nonwoven fabrics includes the performances of 3.1, 3.2 and 2, 4 and 5 in Table 2 of this standard. 5.4 The inspection of nonwoven tapes includes the longitudinal inspection of 3.1, 3.2.2, 3.2.3 and the performance of item 4 in Table 2 of this standard. 5.5 If any of the test results is unqualified, one-dimensional samples should be taken from the other two rolls of the batch of products to repeat the test. If one set of samples is still unqualified, the batch of products is unqualified. 5.6 The user has the right to conduct acceptance tests according to all or part of the performance requirements of this standard. 5.7 The enterprise shall provide the type inspection report of the product when the user requires it. 6 Marking, packaging, transportation and storage
6.1 The outer packaging box (bag, insert) shall be marked with the manufacturing name, product name, model, specification, batch number, net weight, gross weight, production date, "wet-afraid" mark, etc.
6.2 Each roll of nonwoven fabrics shall be wrapped in a plastic bag and then packed in a packaging box, which shall be accompanied by a product certificate. 6.3 Nonwoven fabrics shall be protected from moisture, mechanical damage and direct sunlight during transportation. 6.4 Nonwoven fabrics shall be stored in a dry and clean air with a humidity below 40°C, and shall not be near fire, heating or exposed to direct sunlight. 6.5 The storage period of nonwoven fabrics is one year from the date of leaving the factory. If the storage period exceeds the limit, they shall be inspected according to this standard and can still be used after passing the inspection. 5
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JB/T9554
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