Some standard content:
National Standard of the People's Republic of China
Silk fabric for electric insulation Subject content and scope of application
This standard specifies the quality requirements, test methods, inspection rules and marking packaging of insulating fabrics UDC 677. 37. 063
: 621-315.614
GB 9.072 -- 88
This standard is applicable to the identification of the quality of insulating fabrics, and other pure mulberry silk fabrics similar to insulating fabrics used for electrical insulation materials are also used for reference.
Insulating fabrics are pure mulberry silk plain fabrics, which are scoured and finished after weaving. They are reinforcing materials specially used for the production of oily lacquered silk and mica tapes. 2
Referenced standards
GB2828
GB3923
GB4666
GB 4667
Grey scale for assessing discoloration
Count sampling procedure and sampling table for batch inspection (applicable to inspection of continuous batches)Determination of breaking strength and breaking elongation of woven fabrics (strip method)Determination of length of woven fabrics
Determination of width of woven fabrics
GB4668Determination of density of woven fabrics
GB4669. Determination of mass per unit length and mass per unit area of woven fabricsGBn230
Product classification
Grading regulations for mulberry silk fabrics
Insulation spinning products are divided into No. 1 and No. 2 according to their uses. Product codes and specifications are shown in Table 1.
Width (outer/inner)
Product code
Product code
11102-1
Weight by square meter
Insulation spinning
Insulation spinning
Fabric structure
91.6/90.6
Root/10.cm
Warp, weft
1/23 dtex(1/20/22 D)
1/16 dtex(1/13/15D)
Mulberry silk
Mulberry silk
Post-processing
Note: For other item numbers of insulation spinning, the inner width, density, raw material combination and fabric structure are all No. 1 for the same as 11102-1 insulation spinning, and No. 2 for the same as 11108 insulation spinning.
Approved by the Ministry of Textile Industry of the People's Republic of China on April 16, 1988 and implemented on January 1, 1989
Technical requirements
Technical requirements items
GB 9072-88
Technical requirements for insulation spinning include fabric length, inner width, density, thickness, quality (weight), breaking strength, elongation at break, appearance defects, etc.
4.2 Grading rules
4.2.1 Insulation spinning is divided into first-class products and qualified products. Products lower than qualified products are unqualified products. 4.2.2 The grading of insulation spinning is based on piece. Fabric length, inner width, density, and appearance points are graded by piece. Thickness, quality (weight), breaking strength, and elongation at break are graded by batch. The lowest grade of the eight indicators is the grade of the piece. 4.2.3 See Table 2 for grading rules.
Product code
Technical requirements Item
Piece length, m not shorter than
Inner width, cm
Thickness, mm
Piece/10cm
Breaking strength
N/5 cm ×20 cm
Not less than
Elongation at break
Mass per square meter (weight)
Appearance unit defects
Pieces/hundred meters
Not more than
Appearance defect points evaluation regulations.
Qualified products
Assessment of unit points is shown in Table 3.
10～20
Allowable deviation
"Qualified products
-Qualified products
Allowable deviation
·Qualified products
General point name or
General point category
Width and sharp warp
Fork twisted road
Unfinished
Width and sharp edge
Oil stain
GB9072—88
Defect degree
Every 8cm
is hung tightly into a noticeable bubble shape, every
width 0. 5 cm and less, every 15 cm
Turn over 0.5cm or more, every 15cm
5cm to half width
More than half width
2 to 5cm
Reach the obvious degree in GBn230 silk fabric standard sample
10 cm or less in the warp direction is a grade
Sugar that is discontinuously separated from the tissue, every 1 am
Continuously separated from the organization, 0.5 to 1
0.5 to 1cm
with obvious wide and sharp or hanging edges,
per 100cmwww.bzxz.net
depth reaches GB250 color gray card
2-3 level or below, every 2cm
per 30cm
weft bias exceeds 4% and length exceeds
1/4 piece
unit summary points
unqualified products
supplementary explanation
including broken roughness
including knot marks
1, including the hair removal, weft shrinkage, rough weft, shuttle rolling, sharp weft, elastic and joint. 2. Two shuttles and less are not counted
package Including weaving in of debris, pulling out damage, tearing, mending marks
Including hair, broken ends
4.2.5 The allowable number of unit defects per piece of silk is calculated as follows: The allowable number of unit defects per piece of silk (pieces) = actual length of the piece (m) × the allowable number of unit defects of each category (pieces) 100 (m)
When the allowable number of unit defects per piece of silk has a decimal, it shall be rounded up to an integer. 4.2.6 False shearing (standard length)
4.2.6.1 Local points that seriously affect the appearance of the flat surface of the web, such as shrinkage, rolling shuttle, rough weft, weft opening, holes within 3cm and less, broken edges after mending, and spider webs (rough) that are continuously separated from the organization, weaving in of debris, pulling out damage, pulling out, scratching, tearing, false shearing is allowed, 4.2. 6.2 On average, a false cut is allowed for every 25 m of a piece of silk. 4.2.6.3 For each false cut, the length is 20 cm. 4.2.6.4 The maximum length of the false cut is 20 cm in the warp direction. Continuous points exceeding 20 cm can be falsely cut continuously. 4.2.6.5 Defects of false cuts are no longer included in the unit points of the silk. 5 Test method
5.1 The sample must be flat, without distortion or obvious appearance that may affect the test results. The sample can be cut from any part of the piece of silk. During arbitration, it must be cut more than 2 m away from the end of the piece. 5.2 The length test shall be carried out in accordance with the provisions of method 1 in GB4666. 19
GB9072-88
5.3 The inner width test shall be carried out in accordance with the provisions of method 1 in GB4667. 5.4 Thickness test
5.4.1 Test instrument
0~25mm outer diameter micrometer, the minimum graduation value is 0.01mm. 5.4.2 Test conditions
Conventional test is carried out under natural conditions indoors, and arbitration test is carried out under the conditions of temperature of 20±2℃ and relative humidity of 65%±5%, after humidification for 24 hours.
5.4.3 Test procedure and result calculation
Put the 38cm full width sample fabric into the test position under natural conditions, and then gently turn the dry micrometer ratchet handle. When the small ratchet makes a sound, turn it again and record the reading on the micrometer tube (estimated to 0.001mm). According to this method, 10cm away from the edge, test 10 times along the diagonal direction of the sample (the test position is shown in the figure below), and take the arithmetic mean (calculated to 0.001mm) as the thickness of the mesh. Unit: cm
Note: The "\○" in the figure is the thickness test point. 5.5 The test of square meter mass (quantity) is carried out according to G4669. The test of density is carried out according to GB4668.
5.7 The test of breaking strength and breaking elongation is carried out according to GB3923. 5.8 Inspection method of appearance collapse point
5.8.1 The appearance point is inspected by weft folding table. 5.8.2 Inspection conditions
The height of the inspection table is 90cm, the table is black, 0.5m from the window, natural north light is used, direct sunlight and white light reflection should be avoided, the mixed illumination of the light source on the silk surface is 400±1001xb.
Inspection method
The inspector is located on the light source side, with his eyes 80cm away from the center of the mesh surface. 5.8.3.2 The inspection speed is 15m/min.
5.8.4 Provisions for measuring the length of the defect
5.8.4.1 The length of the defect is measured by the longitude or latitude. 5.8.4.2 When two or more defects are mixed together, the largest defect unit shall be used for calculation. Inspection rules
6.1 Factory inspection
GB 9072—88
6.1.1 Factory inspection shall be carried out in accordance with all items and test methods in the technical requirements of this standard. 6.1.2 Sampling and batching
6.1.2.1 The same task order number is the same inspection batch. 6.1.2.2 Appearance defects, piece length, inner width, and density shall be inspected by piece under natural conditions, but in case of doubt, they must be inspected under the conditions specified in 5.2, 5.3, and 5.6.
6.1.2.3 Thickness, breaking strength, breaking elongation, and quality (weight) shall be inspected by batch, and the inspection quantity shall be in accordance with the special inspection level S-2 specified in GB2828. Samples can be randomly selected from the inspection batch. 6.1.3 Evaluation of inspection results
6.1.3.1 Appearance defects, piece length, inner width, density, etc. are determined by piece. Thickness, breaking strength, elongation at break, quality (weight), etc. are determined by batch, and the quality grade is determined by the lowest grade in the inspected piece. 6.2 Acceptance regulations
6.2.1 Trade acceptance shall be carried out in accordance with the technical requirements, test methods, and packaging markings of this standard. 6.2.2 Sampling and batching
6.2.2.1 The same task order number or invoice number is the same acceptance batch. 6.2.2.2 The inspection quantity for appearance defects, piece length, inner width, and density shall be in accordance with the general inspection level I regulations in GB2828, and samples can be randomly selected from the acceptance batch.
6.2.2.3 Thickness, breaking strength, breaking elongation, mass (weight) shall be drawn in accordance with the provisions of special inspection level S-2 in GB2828. Samples may be drawn from the samples of appearance inspection or randomly drawn from the acceptance batch. 6.2.3 Evaluation of acceptance results
The judgment of whether a batch is qualified or unqualified shall be carried out in accordance with the provisions of the normal inspection sampling plan of GB2828 when the AQL value is 4.0. 6.2.4 If the trading parties have doubts about the inspection results, they have the right to request re-inspection. The re-inspection shall be based on one time, and all expenses shall be borne by the responsible party. 7 Marking and packaging
7.1 Marking
7.1.1 Each piece or section of fabric shall be signed with a hanging ticket, which shall include the name of the manufacturer, product name, code and article number, grade, length, inspection date and inspector code. If there is false cutting, the number of false cutting shall be stated. 7.1.2 False slit fabrics must be stamped with a "false slit" mark on the defect side and marked with false slit. 7.1.3 The ends of each piece or each section must be stamped with the code tip within 5cm from the silk edge and within 10cm from the width edge. 7.1.4 Each box (piece) should be accompanied by a packing list, including: product name, code and article number, number of pieces, piece length, and total length. 7.1.5 The outside of the packaging box should be marked with the manufacturer's name, product name, code and article number, grade, number of pieces, total length, gross weight, box (piece) number, factory date and moisture-proof mark.
7.2 Packaging
7.2.1 The packaging of insulating textiles should ensure that the finished products are not damaged or damp, and are easy to store and transport. 7.2.2 The outer packaging should be cardboard or cloth packaging, the inner layer should be covered with plastic bags, and the outside of the box should be tied with plastic tape or iron sheets. 7.2.3 When using cloth packaging, the outer layer of the inner plastic bag should be lined with corrugated cardboard, and the outer layer should be wrapped with coarse cloth and tied with ropes. The number of tying should be at least two turns and three, and the head must be sewn firmly. The sewing stitch distance should not exceed 3cm. 7.2.4 Every 1000m is allowed to be assembled into three short pieces of more than 20m. 8 Others
If the user has special requirements for the product, the supply and demand parties can make a separate agreement. 21
The sampling quantity and result evaluation are shown in Table A1:
Batch range
51～90
91~150
151～280
281500
501~1200
1 2013 200
3 201 ~~10 000
10001~~35000
Note: N
-Batch range:
-Sample size #
A. Qualified judgment number;
-Unqualified judgment number.
Additional Notes:
GB 9072—88
Appendix A
Sampling Plan for a Normal Inspection
(Supplement)
Special Inspection Level S-2
Qualified Quality Level (AQL)
This standard is proposed by the Silk Administration Bureau of the Ministry of Textile Industry. This standard is under the jurisdiction of Zhejiang Silk Science Research Institute. R.
General Inspection Level i1
Qualified Quality Level (AQL)
This standard is drafted by Suzhou Silk Industry Company, Suzhou Silk Science Research Institute, Suzhou Silk Inspection Institute, and Suzhou Guangming Silk Weaving Factory. The main drafters of this standard are Gu Shangxiong, Sang Xiaoyang, Zhang Qingguo, Ma Peizhu, and Yan Wenying. From the date of implementation of this standard, the former Ministry of Textile Industry standards FJn455-80 "Technical Conditions for Insulation Spinning", FJn456-80 "Regulations on Classification of Insulation Spinning", FJn457-80 "Test Methods for Insulation Spinning", FJm458-80 "Acceptance Rules for Insulation Spinning" and FJn459-80 "Packaging Marks for Insulation Spinning" shall be invalid.4 Three short sections of more than 20m are allowed for every 1000m. 8 Others
If the user has special requirements for the product, the supply and demand parties can make a separate agreement. 21
The sampling quantity and result evaluation are shown in Table A1:
Batch range
51～90
91~150
151～280
281500
501~1200
1 2013 200
3 201 ~~10 000
10001~~35000
Note: N
-Batch range:
-Sample size#
A. Qualified number;
-Unqualified number.
Additional Notes:
GB 9072—88
Appendix A
Sampling Plan for a Normal Inspection
(Supplement)
Special Inspection Level S-2
Qualified Quality Level (AQL)
This standard is proposed by the Silk Administration Bureau of the Ministry of Textile Industry. This standard is under the jurisdiction of Zhejiang Silk Science Research Institute. R.
General Inspection Level i1
Qualified Quality Level (AQL)
This standard is drafted by Suzhou Silk Industry Company, Suzhou Silk Science Research Institute, Suzhou Silk Inspection Institute, and Suzhou Guangming Silk Weaving Factory. The main drafters of this standard are Gu Shangxiong, Sang Xiaoyang, Zhang Qingguo, Ma Peizhu, and Yan Wenying. From the date of implementation of this standard, the former Ministry of Textile Industry standards FJn455-80 "Technical Conditions for Insulation Spinning", FJn456-80 "Regulations on Classification of Insulation Spinning", FJn457-80 "Test Methods for Insulation Spinning", FJm458-80 "Acceptance Rules for Insulation Spinning" and FJn459-80 "Packaging Marks for Insulation Spinning" shall be invalid.4 Three short sections of more than 20m are allowed for every 1000m. 8 Others
If the user has special requirements for the product, the supply and demand parties can make a separate agreement. 21
The sampling quantity and result evaluation are shown in Table A1:
Batch range
51～90
91~150
151～280
281500
501~1200
1 2013 200
3 201 ~~10 000
10001~~35000
Note: N
-Batch range:
-Sample size#
A. Qualified number;
-Unqualified number.
Additional Notes:
GB 9072—88
Appendix A
Sampling Plan for a Normal Inspection
(Supplement)
Special Inspection Level S-2
Qualified Quality Level (AQL)
This standard is proposed by the Silk Administration Bureau of the Ministry of Textile Industry. This standard is under the jurisdiction of Zhejiang Silk Science Research Institute. R.
General Inspection Level i1
Qualified Quality Level (AQL)
This standard is drafted by Suzhou Silk Industry Company, Suzhou Silk Science Research Institute, Suzhou Silk Inspection Institute, and Suzhou Guangming Silk Weaving Factory. The main drafters of this standard are Gu Shangxiong, Sang Xiaoyang, Zhang Qingguo, Ma Peizhu, and Yan Wenying. From the date of implementation of this standard, the former Ministry of Textile Industry standards FJn455-80 "Technical Conditions for Insulation Spinning", FJn456-80 "Regulations on Classification of Insulation Spinning", FJn457-80 "Test Methods for Insulation Spinning", FJm458-80 "Acceptance Rules for Insulation Spinning" and FJn459-80 "Packaging Marks for Insulation Spinning" shall be invalid.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.