Some standard content:
Classification No. Y17
Registration No. 9492—2001
Light Industry Standard of the People's Republic of China
QB/T 2528-2001
Technical Conditions for Coating of Sewing Machines
2001—1 1 —15 Issued
China Light Industry Federation
2002-05-01 Implementation
QB/T 2528--2001
This standard is a revision of the professional standard ZBY17022-1989 "Technical Conditions for Baking Varnish for Sewing Machines" issued by the Ministry of Light Industry (this standard was once issued by the State Light Industry Bureau [19991112 document conversion standard number 0B/T3547--1999, the content is the same as before]. The changes to the main technical contents of the original standard in this standard are as follows:
New content has been added to the definition:
Added classification chapter:
Added coating surface color, coating thickness, coating adhesion performance, coating solvent resistance, coating oil resistance to technical requirements: In addition to coating moisture and heat resistance: New content has been added to the test method accordingly. This standard was proposed by the General Business Department of the China Light Industry Federation. This The standard is issued by the National Sewing Machine Standardization Center. The drafting units of this standard are: Standard Sewing Machine Fan Machinery Co., Ltd., Shanghai Huigong Jidao Machinery Factory No. 3, and Shanggong Co., Ltd.
The main drafters of this standard are: Yu Suxia, Wang Jingyuan, Shu Han, and Zhou Yuzhu. From the date of implementation of this standard, the industry standard OB/T3547-1999 "Technical Conditions for Baking Varnish for Chain Sewing Machines" issued by the former State Bureau of Light Industry will be abolished.
KAONKAA
1 Scope
Light Industry Industry Standard of the People's Republic of China
Technical Conditions for Sewing Machine Coating
This standard specifies the technical requirements and test methods for sewing machine painted parts. This standard applies to the quality assessment of the coating film of sewing machine painted parts. 2 Referenced standards
QB/T 2528-2001
Replaces 0B/T 3547—1999
The following standards contain provisions that constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards.
GB/T1764—1979 Determination of paint film thickness GBT8264—1987 Coating technical terms
GB/T1734-1993 Determination of film resistance to gasoline 3 Definitions
This standard adopts the following definitions.
3.1 Impurities
Particles that form protrusions on the surface of the coating.
3.2 Washing and hanging
The phenomenon that the coating is thicker at the same part and edge after coating and curing. 3.3 Pitfalls
The phenomenon that local depressions appear on the surface of the coating. 3.4 Blisters
The phenomenon that the surface of the coating protrudes to form arches or bubbles. 3.5 Cracks
The phenomenon that cracks appear on the surface of the coating.
3.6 Pinholes
The phenomenon that pinholes appear on the surface of the coating during the curing process. 3.7 Peeling
The phenomenon that the coating peels off.
3.8 Wrinkling
: The phenomenon that the coating folds into wrinkles during the curing process. 3.9 Clarity
The phenomenon that the coating can show the clarity of horizontal and vertical lines under the illumination of a special projection box. 3.10 Adhesion
Approved by China Light Industry Federation on November 15, 2001, implemented on May 1, 2002
The bonding force between the coating and the substrate.
3.11 Hardness
The ability of the coating to resist mechanical effects.
3.12 Abrasion resistance
The ability of the coating to resist abrasion.
3. 13 Impact resistance
The ability of the coating to resist load impact,
3.14 Solvent resistance
The ability of the coating to resist the action of flux.
3.15 Oil resistance
The ability of the coating to resist the action of oils.
4 Classification
QB/T252B—2Q01
According to the different materials and coating functions of various coating parts of sewing machines, different types of coating technical requirements can be selected, generally divided into:
Class A: Applicable to household sewing machine housings and similar parts, which should meet all the items of this standard technical requirements. Health category: Applicable to industrial sewing machine housings and similar parts, which should meet all the items of this standard technical requirements except 5.3.
Class C: Applicable to sewing machine frames and similar parts, which should meet the technical requirements of 5.1, 5.2, 5.5, and 5.8.
Class D: Applicable to sewing machine parts, which should meet the technical requirements of 5.1, 5.2, and 5.5. Class E: Applicable to sewing machine heads, which meet the technical requirements of 5.1, 5.2, and 5.6. Example:
"Surface coating shall meet Class A standards in QB/T2528-2001 Technical Conditions for Coating of Sewing Machines." "Surface coating shall meet Class B standards in QB/T2528-2001 Technical Conditions for Coating of Sewing Machines." 5 Technical requirements
5.1 Appearance
The surface of the coating shall be uniform in color, flat and smooth, without obvious impurities, sagging, blistering, peeling, wrinkling, pinholes, pits, cracks, abrasions, damage and other defects. 5.2 Surface color of the coating
The surface color of the coating shall be in accordance with the specified color. 5.3 Clear coating (applicable to black household sewing machines) When the coating is illuminated by a special projection box, the clarity of the horizontal and vertical lines displayed shall not be lower than that of the standard sample. 5.4 Impact resistance
The coating has no cracks or peeling after the load impact test. The impact strength: hydrogen-based paint is not less than 0.5 (5kg·f·cn), and powder coating is not less than 1J (10kg·f·cm). 5.5 Coating thickness
After the coating thickness tester test, the coating thickness should be 110.m220.m. 5.6 Coating hardness
KAONKAA
QB/T 2528-—2001
After the scratch test, there should be no obvious marks on the coating. 5.7 Coating wear resistance
After the resistance test, the sand drop of the coating is not less than 10kg. 5.8 Coating adhesion
After the cross-cut test, the coating adhesion should be not less than 92 grids. 5.9 Solvent resistance of coating
After the solvent resistance test, the coating should not soften, blister, dissolve, fall off or change color. 5.10 Oil resistance of coating
After the oil resistance test, the coating should not soften, blister, dissolve, fall off or change color. 6 Test methods
6.1 External measurement of coating
6.1.1 Test equipment and conditions
Under the light of illumination (600±200x. 6.1.2 Test methods
Control the inspection distance to be 300mm, and judge by visual inspection. 6.2 Surface color of coating
6.2.1 Test equipment and strip
Under the light of illumination (600±200)x (see Appendix B), reference color plate. 6.2.2 Test methods
The inspection distance is 300mm, and the reference color plate is compared, and the daily measurement is used to judge that there is no obvious difference (see Appendix B). 6.3 Clear film
6.3.1 Test equipment and conditions
Specialized projection box, clear standard mixing board of coating. 6. 3.2 Test method
Put the coating surface of the coated part parallel to the lens of the special projection box, and visually inspect the coating surface at a distance of 500mm. The coating shows a clear horizontal and vertical line clarity that is not lower than the coating clarity standard sample (see Appendix A). 6.4 Coating impact resistance
6.4.1 Splash test equipment and conditions
a) Coating impact instrument: Y-1 type:
b) Vernier caliper: 0-150mm, accuracy ±0.1mm6.4.2 Test method
Put a 5mm thick rubber pad under the tested sample, and use the coating impact instrument to measure the two tested places at the test position (see Appendix C) for household and industrial sewing machines, and the exposed and convenient position for other models. The two tested places should meet the requirements (the white spot in the middle is not considered as a defect). Under natural light (see Appendix B), measure 500mm from the center of the machine head for no more than 2 minutes. 6.5 Coating thickness
8.5.1 Test equipment and conditions
Coating thickness gauge (accuracy: ±10Dm), 6.5.2 Test method
Measure 6 points at random on the coating surface of the coated part, and calculate the average value as the coating thickness value. The coating thickness should meet the requirements of 3
.
6.6 Coating hardness
6. 6.1 Test equipment and conditions
QB/T 2528—2001
2H Zhonghua brand drawing pencil, pencil sharpener, fine sandpaper, gauze or flannel. 6. 6. 2 Test method
Put out a 3mm long lead from a 2H Zhonghua brand drawing pencil and grind the tip of the lead flat (see Figure 1). Hold the pencil with your thumb, index finger and middle finger at an angle of 35° to 45° to the coating, push it forward for 30mm on a coating surface that is easy to operate and easy to fall out, and then use flannel or gauze to remove the lead ash and observe whether there is any trace (see Figure 2). Figure 1
6.7 Abrasion resistance of coating
6.7.1 Test equipment and conditions
Sandblasting test box. 36” green silicon carbide sand, not less than 10kg.6.7.2 Test method
Put the sample to be tested steadily on a special bracket, so that the coating surface is 45 degrees to the vertical center line of the glass guide tube, and perform the sand falling abrasion test. The test point should be selected in an exposed and convenient position (see Figure 3). The distance between the sand falling tube mouth and the coating surface is 1000mm, and the glass tube with an inner diameter of Φ20mm is used as a guide. The sand falling amount is (400±5)g/min. Observe the coating surface wear until the exposed substrate area is about 2imm.6.8 Coating Adhesion
6.8.1 Test equipment and conditions
a) Grid sample: 2mm×2mm (see Figure 4); b) Utility knife:
c) Steel tape: 0~~150mm
d) Translucent pressure-sensitive adhesive tape 24mm wide
$) The specimen is placed at ambient temperature (20±2) and filterability (65±5%) for 12h.
KAONKAA
6. B. 2 Test method
QB/T 2528—2001
Sand bucket
Glass funnel
Sand falling pipe
Also reference
Tested coating
Φ20 (inner diameter)
Glass guide tube
Guide pipe mouthWww.bzxZ.net
Wipe the coating surface with a cloth and cover it with a 2mm×2mm grid sample. The test point should be exposed and convenient for handling. When scratching, the cutter must be replaced with a new blade each time, and a certain angle should be maintained within the range of 35° to 45° relative to the coating surface. In order to make the cut coating close to the substrate, each cut should be made with about 0. .5s at a constant speed. Stick the tape tightly to the square, raise one end of the tape vertically to the surface of the film, and quickly pull it up: 2/3 of a square is stuck, and the square is judged to be completely peeled off. After the coating adhesion cross-cutting test, it is qualified if it falls within 8 squares. 5
6.9 Coating solvent resistance
6.9, 1 Test equipment and conditions
a) Flannel: 25mm×25mm;
b) Test tube: inner diameter 10mm:
) Absorbent cotton;
d Alcohol: concentration 75%.
6. 9. 2 Test method
QB/T 2528--2001
Put the flannel containing solvent in close contact with the coating surface (see Figure 5), put it under the condition of ambient temperature (20±2)℃ and humidity (65±5)%, and remove the test tube and flannel. Touch it with your hands and visually observe whether the coating has blistering, softening, dissolution, or residue. The test point should be selected in an external and convenient location. Test tube
6.10 Oiliness before coating
6.10.1 Test equipment
Flannel cloth: 30mmX40mm
6.10.2 Test method
Absorbent cotton
Use a piece of flannel soaked with 10° sewing machine oil to make close contact with the coating surface (see Figure 5). Place the coating at a temperature of (20±2)℃ and a humidity of (65±5)% for 24 hours, then touch it with your hands and test it by yourself to see if there are any blistering, cracks, softening, or color changes on the coating. The test point should be exposed and easy to operate. KAONKAA
QB/T 2528—2001
Appendix A
(Appendix to the standard)
Photograph of standard sample with clear coating
）Year of the United States
QB/T 2528—2001
Appendix B
(Appendix to the standard)
Instructions for natural light
B1 The sample to be tested can be placed in a window in any direction, but there must be no direct sunlight in the window in front of the sample. The test can be carried out on cloudy or sunny days, and the following two conditions must be met at the same time. The distance between the sample and the window should be within 2 meters and consistent with the horizontal plane of the window. B3 Check the position of B1 under natural light intensity (600±200)x: The illumination test is tested with a CZ--3 type illuminometer according to the room shown in Figure B2.
Natural light
YYKAONYKA
Natural light
QB/T 2528-2001
Appendix C
(Standard Appendix)
Description of test parts
Position for impact test of coating film on household and industrial sewing machines (see Figure C1) 5
Rated point2 Test method
Absorbent cotton
Use flannel soaked with 10° sewing machine oil to make close contact with the coating surface (see Figure 5). Place it at a temperature of (20±2)℃ and a humidity of (65±5)% for 24 hours, then touch it with your hands and test it by yourself to observe whether the coating has blistering, cracks, softening, color change, etc. The test point should be exposed and easy to operate. KAONKAA
QB/T 2528—2001
Appendix A
(Appendix to the standard)
Photograph of standard sample with clear coating
）Year of the United States
QB/T 2528—2001
Appendix B
(Appendix to the standard)
Instructions for natural light
B1 The sample to be tested can be placed in a window in any direction, but there must be no direct sunlight in the window in front of the sample. The test can be carried out on cloudy or sunny days, and the following two conditions must be met at the same time. The distance between the sample and the window should be within 2 meters and consistent with the horizontal plane of the window. B3 Check the position of B1 under natural light intensity (600±200)x: The illumination test is tested with a CZ--3 type illuminometer according to the room shown in Figure B2.
Natural light
YYKAONYKA
Natural light
QB/T 2528-2001
Appendix C
(Standard Appendix)
Description of test parts
Position for impact test of coating film on household and industrial sewing machines (see Figure C1) 5
Rated point2 Test method
Absorbent cotton
Use flannel soaked with 10° sewing machine oil to make close contact with the coating surface (see Figure 5). Place it at a temperature of (20±2)℃ and a humidity of (65±5)% for 24 hours, then touch it with your hands and test it by yourself to observe whether the coating has blistering, cracks, softening, color change, etc. The test point should be exposed and easy to operate. KAONKAA
QB/T 2528—2001
Appendix A
(Appendix to the standard)
Photograph of standard sample with clear coating
）Year of the United States
QB/T 2528—2001
Appendix B
(Appendix to the standard)
Instructions for natural light
B1 The sample to be tested can be placed in a window in any direction, but there must be no direct sunlight in the window in front of the sample. The test can be carried out on cloudy or sunny days, and the following two conditions must be met at the same time. The distance between the sample and the window should be within 2 meters and consistent with the horizontal plane of the window. B3 Check the position of B1 under natural light intensity (600±200)x: The illumination test is tested with a CZ--3 type illuminometer according to the room shown in Figure B2.
Natural light
YYKAONYKA
Natural light
QB/T 2528-2001
Appendix C
(Standard Appendix)
Description of test parts
Position for impact test of coating film on household and industrial sewing machines (see Figure C1) 5
Rated point
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.