This part specifies the model, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of oily synthetic fiber varnished silk (hereinafter referred to as varnished silk). This part is applicable to varnished silk with a temperature index of 105, which is made of synthetic fiber fabrics or non-woven fabrics impregnated with oily insulating varnish and dried. JB/T 7772-1995 Oily synthetic fiber varnished silk JB/T7772-1995 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7772-1995
Oil-based synthetic fiber varnished silk
1995-10-09 Issued
Ministry of Machinery Industry of the People's Republic of China
1996-01-01 Implementation
Mechanical Industry Standard of the People's Republic of China
Oil-based synthetic fiber varnished silk
Subject content and scope of application
JB/T7772-1995
This standard specifies the model, technical requirements, test methods, inspection rules, marking, packaging,
transportation and storage of oil-based synthetic fiber varnished silk (hereinafter referred to as varnished silk).
This standard applies to varnished silk with a temperature index of 105, which is made of synthetic fiber fabrics or non-woven fabrics impregnated with oil-based insulating varnish and dried. 2 Reference standards
GB1306-87
GB1309-87
GB1310—87
Oil-based varnished silk
Test methods for electrical insulating varnished cloth
General rules for inspection, marking, packaging, transportation, and storage of electrical insulating varnished cloth. The varnished silk models are shown in Table 1.
Technical requirements
4.1 Appearance
Using synthetic fiber fabric as the base material, the general type uses electrical polyester fiber non-woven fabric (7031) as the base material, and the transformer oil resistant type uses synthetic fiber fabric as the base material, and the transformer oil resistant type has high dielectric strength. The paint film should be uniform, without bubbles, creases, damage, and impurities that affect use. The paint film should not be damaged due to bonding when unwinding. The reel should be cut neatly and should not fall off the reel.
4.2 Size
4.2.1 Length The recommended length of each roll is 30+, 40*, 50*, 100*m. Each roll should not have more than two sections, and the length of each section should be greater than 10m. 4.2.2 Width The width should not be less than 850mm, and the width should be consistent in the roll. Painted silk that meets this standard can be cut straight or beveled (generally at an angle of 45° or 30°) into strips with widths of 15, 20, 25mm and other widths according to user needs. The overlap length of bevel-cut painted silk strips shall not exceed 25mm. For strips with a width of 100mm or less, the deviation is ±0.5mm. For strips with a width of more than 100mm, the deviation is ±1% of the width. The model of painted silk strips is the same as that of painted silk.
4.3 Nominal thickness and allowable deviation
The nominal thickness and allowable deviation shall comply with Table 2 Regulations. Approved by the Ministry of Machinery Industry on October 9, 1995
Implementation on January 1, 1996
Nominal thickness
4.4 Performance indicators
4.4.1 Tensile strength shall comply with the provisions of Table 3. Nominal thickness
JB/T7772-1995
2310, 2312
Tensile strength, N/10mm, not less than
Elasticity (tension when extended) shall comply with the provisions of Table 4. 4. 4.2
4.4.3 Thermoplastic
Nominal thickness
Minimum value
Nominal elongation
Minimum value
Tensile median value when obtaining nominal elongation
45° direction
Minimum value
Maximum tension when obtaining nominal elongation
After the paint silk is treated at a temperature of 70±2℃ for 24h, there shall be no interlayer adhesion or detachment of the paint film from the substrate. 4.4.4 Volume resistivity shall comply with the requirements of Table 5. Room
≥1.0×10
JB/T7772-1995
High temperature (105±2℃)
24 h after
Shrinkage rate After the paint silk is treated at a temperature of 105±2℃ for 6h, the shrinkage of models 2310 and 2312 shall not exceed 4%, and the shrinkage of model 2311 shall not exceed 2%.
4.4.6 Effect of oil on paint silk After the paint film of models 2310 and 2312 is treated in No. 45 transformer oil at 145±2℃ for 18h, the layers shall not be bonded, and the paint film shall not fall off from the substrate (a small amount of peeling at the edge is allowed). The breakdown voltage shall comply with the provisions of Table 6.
Nominal thickness
After bending at room temperature
At 105±2℃
After bending by heat treatment||t t||After being exposed to moisture for 24 hours
When the elongation is 6%
Test method
5.2 Dimensions
Minimum value
Perform in accordance with Article 3.1 of GB1306.
5.2.2 Width
5.2.3 Thickness
Perform in accordance with Article 3.2 of GB1306.
Perform in accordance with Article 3.3 of GB1306.
Perform in accordance with Chapter 4 of GB1309.
Perform in accordance with Chapter 8 of GB1309.
5.3 Tensile strength
Perform in accordance with Article 3.4 of GB1306.
Thermoplasticity
Perform in accordance with Article 3.5 of GB1306.
pressure; kv;
minimum value
minimum value
minimum value
JB/T 7772 -1995
performed in accordance with Article 3.7 of GB1306.
volume resistivity
shrinkage rate shall be carried out in accordance with Article 3.8 of GB1306 or in accordance with Article 3.6 of GB1306.
the effect of oil on lacquered silk
breakdown voltage shall be carried out in accordance with Article 3.9 of GB1306. Inspection rules
factory inspection items are the breakdown voltage at room temperature and after bending at room temperature in Table 6 of Articles 4.1; 4.2, 4.3 and 4.4.7 of this standard. 6.1
type test items are all items of the technical requirements of this standard, and the inspection rules shall be in accordance with Chapter 1 of GB1310. 6.2
Marking, packaging, transportation, storage
The marking, packaging, transportation and storage of varnished silk shall comply with the provisions of GB1310. Additional remarks:
This standard is proposed by the National Technical Committee for Standardization of Insulating Materials. This standard is under the jurisdiction of Guilin Electric Science Research Institute of the Ministry of Machinery Industry. This standard is drafted by Xuchang Insulating Materials General Factory. The main drafter of this standard is Lu Jilong.
This standard adopts TOTC2214-78 "Technical Conditions for Electrical Insulating Varnished Cloth". 4
People's Republic of China
Mechanical Industry Standard
Oil-based synthetic fiber lacquered silk
JB/T 7772 - 1995
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
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Printing X, XX, 19XX
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