Some standard content:
ICS55.140
National Standard of the People's Republic of China
GB/T17590-2008
Replacement GB/T17590-1998
Three-piece can with aluminum easy open end2008-07-18Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaDigital price
Standardization Administration of the People's Republic of China
2009-01-01Implementation
This standard replaces GB/T17590-1998 "Three-piece can with easy open end". Compared with GB/T17590-1998 "Easy-open Three-piece Cans", this standard has the following major changes: The scope of application is clarified as canned non-carbonated beverages: The relevant content of tinned (chromium) thin steel plate easy-open ends is deleted: GB/T17590-2008
Updates and adjusts the referenced documents,
Adds the definitions of aluminum easy-open three-piece cans, necked cans, straight cans, powder-coated cans, and liquid-coated cans, and cancels the definition of weld-coated cans:
Adds the classification of can bodies according to the form of coating and spraying method, adds 3 can body specifications and 1 lead easy-open end specification, and specifies the main dimensions and deviation requirements: For aluminum easy-open end opening The lower limit of breaking force and full opening force is slightly adjusted: Printing quality requirements comply with the provisions of QB/T1877: Delete the relevant content about the coating amount in the performance of internal and external coatings: The test temperature of the curing performance of the internal and external coatings is determined according to the sterilization process requirements, and the quality requirements of the dry film of the sealant of the aluminum easy-open end and the bottom cover for normal pressure sterilization at 100℃ and high pressure sterilization at 121C are adjusted according to the dry film density of the sealant of 1.3mg/mm2; The pressure test value of the pressure resistance and sealing performance requirements of the aluminum easy-open end and the bottom cover is increased to 180kPa. Add hygiene requirements:
Specify the test conditions for opening reliability
This standard is proposed by the China Packaging Federation. This standard is under the jurisdiction of the National Packaging Standardization Technical Committee. This standard was drafted by the National Packaging Standardization Technical Committee Metal Container Technical Committee (SAC/TC49/SC8). The drafting units of this standard are: Hangzhou COFCO Packaging Co., Ltd., National Packaging Product Quality Supervision and Inspection Center (Guangzhou), Sanshui Jianlibao Fute Container Co., Ltd., Beijing O.R.G. Xinmei Can Co., Ltd., Bohua Container Co., Ltd., Guangrong Packaging Co., Ltd., Hebei Jiamei Tinplate Can Co., Ltd., Yiwu Easy-Open Cap Industrial Co., Ltd. China Packaging Federation The main drafters of this standard are: Zhu Liping, Feng Hui, Zhou Jinchang, Cai Jiansen, Lu Ming, Zhang Zuoquan, Tan Zhaojun, Chen Yongjun, Fan Zhilong, Wang Xiaohua, The previous versions of the standards replaced by this standard are as follows: GB/T17590-1998
Aluminum three-piece cans with easy-open ends
GB/T17590-2008
This standard specifies the requirements, test methods, inspection rules and marking, packaging, transportation and storage of aluminum three-piece cans with easy-open ends. This standard applies to the manufacture, use, circulation and supervision inspection of aluminum three-piece cans with easy-open ends that are made of tin (chromium) plated steel sheets and aluminum alloy plates and are used to fill non-carbonated beverages and meet commercial sterility requirements after sealing and sterilization. Other similar products can refer to this for implementation. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version applies to this standard. GB/T191 Pictorial markings for packaging, storage and transportation (GB/T191-2008, ISO780:1997, MOD) GB/T2520 Cold-rolled electroplated tinned steel sheet (GB/T2520-2000.eqvISO11949:1995) GB/T2828.1 Sampling inspection procedures for attributes Part 1: Sampling plan for batch inspection based on acceptance quality limit (AQL) (GB/T2828.1-2003.ISO2859-1:1999, IDT) GB4805 Hygienic standard for epoxy phenolic coatings for the inner wall of food cans GB4806.1 Rubber products for food Product hygiene standard GB/T13040
GB/T14251
Packaging terms Metal containers
Technical conditions for tin-plated steel sheet canned containers Packaging decoration Copper (chromium) plated steel sheet Printed matter QB/T1877
QB/T2763
Coated tin (or chromium) plated steel sheet
3 Terms, definitions and symbols
3.1 Terms and definitions
The following terms and definitions established in GB/T13040 apply to this standard 3.1.1
Aluminum easy-open end three-piece can with aluminum easy-open end A metal can that is made by rolling the aluminum easy-open end, bottom cover and can body. 3.1.2
Necked-in can
A can with a can body with a narrowed cross section at one or both ends. 3.1.3
straight-bodycan
The cross section of the can body is constant from top to bottom, and the local rolling ribs can be ignored. 3.1.4
Liquid striped canLiquid striped canThe can that uses liquid paint to apply to the inside of the can body weld. 3.1.5
Powder striped canPowder striped canThe can that uses powder paint to apply to the inside of the can body weldGB/T17590-2008
Sprayed canSprayed canThe can that uses powder paint to apply to the inside of the can body weld. 3.1.7
Splash point
When moving welding, the welding point is too high, so that the center temperature of the weld reaches or exceeds the melting point of iron, and the molten metal is squeezed out. Commonly known as burrs.
Cold welding
When the welding temperature is too low, the two thin steel plates cannot reach the plastic melting state (only melted). Commonly known as false welding or virtual welding 3,1.9
Pinhole
During welding, the hot melt tin-plated thin steel shrinks slower than the tin-plated thin steel plate, forming a penetrating hole. 3.1.10
puncture
Some welds in the weld are melted and perforated due to excessive current (such as wind and coating film). 3.1.11
miss-weding
No current flows through one or more welds in the weld. 3.1.12
Repair coating
Anti-corrosion coating is applied to the weld and its two sides by electrostatic spraying. Integrity of internal coating
enamel rate
Defective current indicates the current caused by improper raw materials and processing technology, resulting in the appearance of unnecessary micropores on the surface of the inner coating. 3.2 Symbols
3.2.1 Can body
D Inner diameter of can body
Inner diameter of can neck:
Height of can body:
Flange width.
Easy to open end, bottom cover
4 Classification
4.1 Can body||tt ||Hook outer diameter:
Hook opening:
Heading degree,
Hook height.
4.1.1 According to the thin type, it can be divided into necked can and straight can, see Figure 1 Figure 2) Three-shrink can
) Non-rolling can
b) Two-braided neck end
Figure 1 Necked can
Figure 2 Straight can
4.1.2 According to the structure of the body, it can be divided into sealed aluminum easy-open can and sealed bottom cover can. 4.1.3 According to the form of re-coating of the can body, it can be divided into liquid re-coating can and powder re-coating can. 4.51.4 According to the spraying method of the can body, it can be divided into full spraying can and non-full spraying can. 4.2 Aluminum easy-open end
According to the structure, it can be divided into pull ring type, retaining plate type and full-open easy-open end, see Figure 3) Pull ring type
4.3 Bottom cover
6) Retaining plate type
Figure 3 Easy-open end
According to the material, it can be divided into tin (chrome) steel sheet and aluminum alloy sheet bottom cover: see Figure 4b) Ribbed can
GB/T17590-2008
c) Single neck can||tt ||e) Fully open
GB/T17590-2008
4.4 Aluminum easy-open three-piece can model
Example:
5 Material
Figure 4 Bottom cover
211/209×309
High code
Joint cover Yi Dai Zero
Super body nominal code
Ming easy-open cover code
5.1 The plated steel sheet shall also comply with the provisions of GB/T2590. 5.2 The minimum average metal layer mass of the chrome-plated steel sheet is 30 mg/m3 and the hydrated chromium oxide layer is 5 mg/m3: its appearance quality shall refer to the provisions of GB/T2520,
5.3 The adhesion and impact resistance of the tin-plated (or slightly tin-plated) steel sheet shall comply with the provisions of QB/T2763. 5.4 The aluminum alloy sheet shall be a magnesium alloy sheet with appropriate tensile strength, development strength, elongation and compatibility. 5.5 The sealant shall comply with the provisions of 6.1 of Japan, and shall be suitable for the corresponding content characteristics. 5.6 The epoxy powder formaldehyde type coating shall comply with the provisions of GB4805. Other internal coatings shall comply with the relevant national food hygiene requirements. 6 Requirements
6.1 Body
The main dimensions and limit deviations of the body shall comply with the provisions of Table 1, see Figure 1 and Figure 2. 6.1.1
Table 1 Main dimensions and limit deviations of the body
113/202/200X402
113/202/200×504
200/202/200×402
200/202/200X504
202/202/202X504
206/211/209×214
Inner diameter of the body
Height of the body
Flanging width Bim
Sealing easy-to-open bun|| tt||±0:20
Bottom seal relief
Neck inner diameter d/mm
Easy-open can
Bottom seal relief can
206/211/209X309
206/211/209X408
206/211/209X413
209/211/209X309
209/211/209X413
209/211/209X508
Inner diameter of tank
Note: the specifications and dimensions can be determined by the supplier and the buyer in advance6.1.2
Table 1 (continued)
Height of tank||tt| |The double-rolled sealing structure shall meet the requirements of Table 2 Table 2
Delivery length
Tightness/%
6.1.3 External quality of the catalyst
Flanging smoothness B/mm
Sealing easy-open cans
Sealing bottom cover end
Double-rolled sealing structure
Sealing aluminum plate easy-open straight or bottom cover pin 6
CB/T17590-2008
Can neck inner diameter d/mm
Sealing easy-open cans
Sealing bottom cover cans
Sealing cans with plated (coated) thin steel plate bottom cover
6.1.3.1 The body shall be intact, without deformation, obvious corrosion, stains, or abnormalities6.1.3.2 The double grid edge seal is smooth and uniform. There shall be no false curling and large edges in the rolled parts, and there shall be no defects such as incomplete edge pushing, rolled edge teeth, iron tongue, jump seal, over-edge cracking, filler extrusion, sharp edges, heavy lips, double lines, etc. 6.1.3.3 The weld is flat and smooth, and there shall be no cold welding holes. There shall be no flying points on the inside of the weld. The sum of the tailing and misalignment of the weld end shall not exceed 0.5mm. Re-coating and finishing
6.1.3.4 Printing quality/product comfort meets the requirements of QB/T1877 6.1.3.5 Internal and external coating stripping is smooth and the wall is smooth 6.1.4 The main properties of the tank body shall meet the requirements of Table 3 Table 3 Main properties of the body
Internal and external coating performance
Performance standard
Internal and external coating insulin 100C or 121 Glandular curing test, the inner coating has no whitening, grouting, and falling off, the outer dyeing film has no obvious loss of gloss, thorns and falling off, and the printed picture has obvious color retention. According to the characteristics of the contents and the requirements of the first-line process, the wall sample is subjected to 100C or 121C corrosion resistance test. The inner coating film has good corrosion resistance, weld seam and external coating integrity, inner coating film, non-full spray, liquid coating tank, powder coating tank, full spray tank, pressure resistance, sealing performance, 6.1.5 Compatibility ||No sound of falling off and obvious wear
After the test, there should be no linear or dense wear points, single value ≤50 average value ≤30
Single value 30, average value 15
Single value ≤15, average value ≤8
Under 150tPa (180kPa when the tank height is greater than 2 times the tank diameter), maintain pressure for 1min, no permanent deformationUnder 150kPa (180kPa when the tank height is greater than 2 times the tank diameter), maintain pressure for 1min, no leakage is allowed)Users should conduct product compatibility tests on empty cans according to the different contents of the whole package, and confirm by hand. GB/T17590--2008
6.2 Aluminum easy-open end and bottom cover
6.2.1 The main dimensions and limit deviations of aluminum easy-open end and bottom cover shall comply with the provisions of Table 4 and Table 5, see Figure 5 and Figure 6. Figure 5 Main dimensions of aluminum easy-open lid
Figure 6 Main dimensions of bottom lid
Pull ring type
Leave sheet type
Fully open type
Light outside edge
Note: Specifications and dimensions can be determined by negotiation between the supply and demand parties, representing
Outer diameter of dog edge
Note: Specifications and dimensions can be determined by negotiation between the supply and demand parties. Main dimensions of aluminum easy-open lid
Hook edge opening
≥2,72| |tt||Counter sinking
Table 5 Main dimensions of bottom cover
Hook edge opening
Counter sinking
3.10±0.13
6.2.2 Appearance quality of aluminum easy-open cover and bottom cover
6.2.2.1 The structure should be intact, and the hook edge should not have obvious wrinkles and deformation. 6.2.22
The cover should be clean and the internal and external coatings should be complete
The sealant should be complete and uniform.
6.2.3 The main performance of the aluminum easy-open bottom cover should meet the requirements of Table 6. Vehicle edge height
Hook edge height
2.00±0.20
Number of
Number of covers
Mass of dry film of sealant/m cup
Breaking force/N
Full opening force
Pull ring type
Retained type
Pull ring type
Retained sheet type
Openability
Inside and outside coating
Inside and outside membrane affinity
Qiguo Chemical
Inside coating
Decoration resistance
Inside coating integrity/
Compression strength
Sealing
Table 6 Aluminum easy-open cover and bottom cover Main performance
Easy to open lid
15--40
Open the self-opening pull ring (the piece does not fall off and is completely opened
Fully open
GB/T17590--2008
or 121C coating curing test, the inner coating has no detachment or falling off, and the outer coating has no obvious loss of gloss or obvious color loss
According to the requirements of the content, the lid is 100 or 121C, and the inner coating has no difference in height, shedding, obvious corrosion
Single value is 5, average value
Under 180k pressure for 1min, there is no permanent change||tt ||At 180kp
Note: This table comes from the selected glue dry glue density of the week
Health requirements
Aluminum easy-open lid
7 Test method
Kerui should comply with relevant national food
7.1 Appearance quality inspection
Visual inspection.
72 Main dimension measurement
Pressure holding min non-filling leakage
Can body, easy-open lid, bottom cover main dimensions, measured with special or general measuring tools. The minimum reading value of the measuring tool is not greater than 0.01mm. 7.3 Double crimping sealing structure measurement
Select the measurement of joint length, delivery rate, and tightness according to G 7.4 Internal and external coating quality inspection
7.4.1 Internal and external coating curing test
7.4.1.1 Internal coating curing test
According to the sterilization requirements, place the can body or cover as a whole in a tempered container, add distilled water to immerse the sample and seal it, heat it to 100°C or 121°C. Keep the temperature constant for 30 minutes, take it out, cool it and dry it, and then visually inspect it. 7.4.1.2 External coating curing test
According to the sterilization requirements, place the can body or cover as a whole in a steaming pot, add distilled water to immerse the sample. Heat it to 100°C or 121°C, keep the temperature constant for 30 minutes, take it out, cool it and dry it, and then visually inspect it. 7.4.2 Internal coating corrosion test
According to the characteristics of the contents and the sterilization requirements, immerse the can body or cover in an inert container containing the corresponding test solution listed in Table 7 and seal it. Test according to one of the conditions. After the test, cool immediately, wash with clean water, dry, and inspect by day. GB/T17590--2008
Content characteristics
Acidic contents using normal pressure tea fungus
Protein-containing contents using high pressure sterilization Low acid or other contents using high pressure sterilization Table 7 Internal coating corrosion test
Test solution
2% (mass concentration) citric acid (CHO·HO) solution 0.055% (mass concentration) sodium sulfate (NaS·9HO) solution Adjust the pH value to 6.02% (mass concentration) with 3% (mass fraction) acetic acid Citric acid (CHO+H:O) solution Note: The test solution is prepared with analytical reagents and distilled water. Test conditions
100℃.30min
121,30min
121c.30min
7.5 Integrity test of external coating
Immerse the external coating of the weld in a mixed solution of 20% (mass concentration) copper sulfate (CuSO:·5H?O) and 10% (volume fraction) hydrochloric acid. After 1 minute, take out the sample, rinse it with water, dry it, and visually inspect it. 7.6 Integrity test of internal coating
7.6.1 Instrument and electrolyte
7.6.1.1 Integrity tester of internal coating: DC voltage 6.3V, minimum reading value not greater than 0.1mA7.6.1.2 Electrolyte: 2% (mass concentration) sodium sulfate solution, 1% (mass concentration) sodium fluoride solution. Note: The test solution is prepared with analytically pure reagents and steamed stuffing water. 7.6.2 Integrity test of internal coating film of cans
Use the internal coating film integrity tester, connect the can body to the positive electrode, add 2% (mass concentration) sodium sulfate solution in the can, insert a stainless steel rod to the negative electrode at a distance of 3mm from the liquid level at the can mouth, and read the internal coating film defect current value at the 4th second. 7.6.3 Integrity test of internal coating film of easy-open ends and bottom covers 7.6.3.1 Easy-open ends and bottom covers of aluminum alloy sheets: Use the internal coating film integrity tester, use 1% (mass concentration) sodium fluoride solution for testing, and read the internal coating film defect current value at the 4th second 7.6.3.2 Bottom covers of (chrome) thin steel sheets: Use the internal coating film integrity tester, use 2% (mass concentration) sodium sulfate solution for testing, and read the internal coating film defect current value at the 4th second. 7.7 Tank pressure test
Put the tank into water, fill the tank with compressed air and slowly increase the pressure to the specified value (gauge pressure), maintain the pressure for 1min. After releasing the pressure, observe whether the tank has permanent deformation
7.8 Tank sealing test
During the test, observe whether the tank has leakage. 7.9 Quality inspection of dry sealant film
Use a balance with a sensitivity of 0.001g to weigh the sealed cover as W1. Remove the sealant and weigh it after drying as W. The quality of the dry sealant film (W) is equal to Wi minus W
7.10 Tests of the opening force and full opening force of aluminum easy-open covers Use a breaking force with a reading value not greater than 1N and a full opening force tester to test the cover. Read the maximum value when the pull ring is opened and when the pull ring is completely detached.
7.11 Opening reliability test of aluminum easy-open covers
After baking at 200.℃ for 5min and cooling, open the aluminum easy-open cover by hand or with simple tools. 7.12 Pressure resistance test of aluminum easy-open covers and bottom covers
Use a cover pressure resistance strength tester with a reading value not greater than 10kPa to slowly increase the pressure of the cover to 180kPa (gauge pressure), maintain the pressure for 1min, and observe whether the cover has permanent deformation after pressure relief.
7.13 Sealing test of aluminum easy-open end and bottom cover During the test in 7.12, observe whether the sample has leakage. 8 Inspection rules
8.1 Products of the same variety and specification delivered in the same batch are the same inspection batch. 8
GB/T17590—2008
8.2 Product inspection is divided into delivery inspection and type inspection. Products should be inspected at the time of delivery. 8.3 The items of delivery inspection are 6.16.2, and the items of type inspection are all the contents of Chapter 6. The product should be subject to type inspection when any of the following conditions exist: new products or old products are converted to trial production and type identification: when the structure, material, or process changes may affect product performance; normal production, inspection every six months: when production is resumed after a long period of suspension;
when the factory inspection results are significantly different from the last type inspection: when the national quality supervision agency proposes a requirement for type inspection, 8.4 The classification of unqualified aluminum easy-open ends, bottom covers, and can bodies is shown in Tables 8 and 9. Table 8 Classification of appearance defects of easy-open ends and bottom covers Category
Easy to open invoice, deer cover
Unqualified classification
Class A unqualified
Class B unqualified
Class C unqualified
Unqualified classification
Class A unqualified
Class B unqualified
Class C unqualified
8.5 Sampling plan
Defect content
Misreporting, broken glue, obvious oil stains and foreign matter on the inside of the cover, metal entanglement, coating separation or shedding, serious wrinkles on the edge, easy to open cover without pull ring.
Sealant contamination, partial coating leakage greater than 2mm, obvious deformation of hook edge, inner and outer coating film scratched and abraded but the metal leg is not exposed, the hook edge is slightly wrinkled and deformed, the sealant overlap is uneven, and the surface is rusted
Table 9 Classification of body appearance defects
Defect content
Obvious oil stains, foreign matter stains, metal curtains, cold welding, welding leakage, hole adjustment, breakdown, flange cracks, double curling, large edges, quick mouth
Inner film and inner patch coating have obvious bubbles and yellowing, the maximum concave size does not exceed 1cm, and no damage to the inner coating film is caused, obvious scratches, printed pattern sideways, inner printing color, incomplete curling, sealing, and cracks. There is a slight difference between the printing color and the sample, the printing pattern is slightly misaligned, there are small scratches that do not show the metal, the curling glue is overflowed, the welding joint is misaligned, the tail exceeds 0.5mm, and the surface is rusted. 8.5.1 The internal coating curing and corrosion resistance shall be inspected according to Table 10. Table 10 Sampling plan and judgment of internal coating curing and corrosion resistance inspection Name
Aluminum easy-open apple, bottom cover, can body
Inspection item
Internal coating curing
Resistance
Unqualified classification
Class A unqualified
Batch range
Number of samples
Judgment array
8.5.2 Other factory inspections The type inspection items are inspected according to the normal inspection secondary sampling plan in GB/T2828.1, see Table 11 and Table 12
GB/T175902008
Easy to open end, bottom cover
Inspection level
Table 11 Inspection level and acceptance quality limit (AQL) Inspection items
Quality of dry film of sealant
Integrity of inner coating
Opening force
Full opening force
Opening reliability
Compressive strength
Sealing
Double curling structure
Integrity of inner coating||tt| |Integrity of weld patch tape
Compressive strength
Sealing
Batch inspection set level
Unqualified classification
Class A unqualified
Class B unqualified
Class C unqualified
Class C unqualified
Class B unqualified
Class A unqualified
Class B unqualified
Class B unqualified
Class A unqualified
Class A unqualified
Class A unqualified
Class B unqualified
Class C unqualified
Class C unqualified
Qualified
Class A unqualified
Class A unqualified
Class A unqualified
Class A unqualified
Table 12 Normal inspection secondary sampling plan
Batch range
>35001
35001500000
500001
35001-500:600
2500001
Acceptance quality limit
Number of samples
Acceptance quality limit
Judgment array
L12/13-02% (mass concentration) citric acid (CHO+H:O) solution Note: The test solution is prepared with analytical reagents and distilled water. Test conditions
100℃.30min
121,30min
121c.30min
7.5 Integrity test of external repair coating
Immerse the weld external repair coating in a mixed solution of 20% (mass concentration) copper sulfate (CuSO:·5H?O) and 10% (volume fraction) hydrochloric acid. After 1 minute, take out the sample, rinse it with clean water, dry it, and visually inspect it. 7.6 Internal coating integrity test
7.6.1 Instrument and electrolyte
7.6.1.1 Internal coating integrity tester: DC voltage 6.3V, minimum reading value not greater than 0.1mA7.6.1.2 Electrolyte: 2% (mass concentration) sodium sulfate solution, 1% (mass concentration) sodium fluoride solution. Note: The test solution is prepared with analytical reagents and distilled water7.6.2 Internal coating integrity test for cans
Use the internal coating integrity tester, connect the can to the positive electrode, add 2% (mass concentration) sodium sulfate solution in the can, insert a stainless steel rod 3mm from the can mouth to the negative electrode, and read the internal coating defect current value at the 4th second. 7.6.3 Integrity test of inner coating film of easy-open end and bottom cover 7.6.3.1 Easy-open end and bottom cover of aluminum alloy sheet: Use inner coating film integrity tester, use 1% (mass concentration) sodium fluoride solution to test, and read the inner coating film defect current value at the 4th second 7.6.3.2 Bottom cover of (chrome) thin steel sheet: Use inner coating film integrity tester, use 2% (mass concentration) sodium sulfate solution to test, and read the inner coating film defect current value at the 4th second. 7.7 Pressure test of tank body
Pour the tank into water, fill the tank with compressed air and slowly increase the pressure to the specified value (gauge pressure), maintain the pressure for 1min. After decompression, observe whether the tank body has permanent deformation
7.8 Sealing test of tank body
During the test, observe whether the tank body has leakage. 7.9 Quality inspection of dry sealant film
Use a balance with a sensitivity of 0.001g to weigh the sealed cover as W1. Remove the sealant and weigh it after drying as W. The quality of the dry sealant film (W) is equal to Wi minus W
7.10 Tests of the opening force and full opening force of aluminum easy-open covers Use a breaking force with a reading value not greater than 1N and a full opening force tester to test the cover. Read the maximum value when the pull ring is opened and when the pull ring is completely detached.
7.11 Opening reliability test of aluminum easy-open covers
After baking at 200.℃ for 5min and cooling, open the aluminum easy-open cover by hand or with simple tools. 7.12 Pressure resistance test of aluminum easy-open covers and bottom covers
Use a cover pressure resistance strength tester with a reading value not greater than 10kPa to slowly increase the pressure of the cover to 180kPa (gauge pressure), maintain the pressure for 1min, and observe whether the cover has permanent deformation after pressure relief.
7.13 Sealing test of aluminum easy-open end and bottom cover During the test in 7.12, observe whether the sample has leakage. 8 Inspection rules
8.1 Products of the same variety and specification delivered in the same batch are the same inspection batch. 8
GB/T17590—2008
8.2 Product inspection is divided into delivery inspection and type inspection. Products should be inspected at the time of delivery. 8.3 The items of delivery inspection are 6.16.2, and the items of type inspection are all the contents of Chapter 6. The product should be subject to type inspection when any of the following conditions exist: new products or old products are converted to trial production and type identification: when the structure, material, or process changes may affect product performance; normal production, inspection every six months: when production is resumed after a long period of suspension;
when the factory inspection results are significantly different from the last type inspection: when the national quality supervision agency proposes a requirement for type inspection, 8.4 The classification of unqualified aluminum easy-open ends, bottom covers, and can bodies is shown in Tables 8 and 9. Table 8 Classification of appearance defects of easy-open ends and bottom covers Category
Easy to open invoice, deer cover
Unqualified classification
Class A unqualified
Class B unqualified
Class C unqualified
Unqualified classification
Class A unqualified
Class B unqualified
Class C unqualified
8.5 Sampling plan
Defect content
Misreporting, broken glue, obvious oil stains and foreign matter on the inside of the cover, metal entanglement, coating separation or shedding, serious wrinkles on the edge, easy to open cover without pull ring.
Sealant contamination, partial coating leakage greater than 2mm, obvious deformation of hook edge, inner and outer coating film scratched and abraded but the metal leg is not exposed, the hook edge is slightly wrinkled and deformed, the sealant overlap is uneven, and the surface is rusted
Table 9 Classification of body appearance defects
Defect content
Obvious oil stains, foreign matter stains, metal curtains, cold welding, welding leakage, hole adjustment, breakdown, flange cracks, double curling, large edges, quick mouth
Inner film and inner patch coating have obvious bubbles and yellowing, the maximum concave size does not exceed 1cm, and no damage to the inner coating film is caused, obvious scratches, printed pattern sideways, inner printing color, incomplete curling, sealing, and cracks. There is a slight difference between the printing color and the sample, the printing pattern is slightly misaligned, there are small scratches that do not show the metal, the curling glue is overflowed, the welding joint is misaligned, the tail exceeds 0.5mm, and the surface is rusted. 8.5.1 The internal coating curing and corrosion resistance shall be inspected according to Table 10. Table 10 Sampling plan and judgment of internal coating curing and corrosion resistance inspection Name
Aluminum easy-open apple, bottom cover, can body
Inspection item
Internal coating curing
Resistance
Unqualified classification
Class A unqualified
Batch range
Number of samples
Judgment array
8.5.2 Other factory inspections The type inspection items are inspected according to the normal inspection secondary sampling plan in GB/T2828.1, see Table 11 and Table 12Www.bzxZ.net
GB/T175902008
Easy to open end, bottom cover
Inspection level
Table 11 Inspection level and acceptance quality limit (AQL) Inspection items
Quality of dry film of sealant
Integrity of inner coating
Opening force
Full opening force
Opening reliability
Compressive strength
Sealing
Double curling structure
Integrity of inner coating||tt| |Integrity of weld patch tape
Compressive strength
Sealing
Batch inspection set level
Unqualified classification
Class A unqualified
Class B unqualified
Class C unqualified
Class C unqualified
Class B unqualified
Class A unqualified
Class B unqualified
Class B unqualified
Class A unqualified
Class A unqualified
Class A unqualified
Class B unqualified
Class C unqualified
Class C unqualified
Qualified
Class A unqualified
Class A unqualified
Class A unqualified
Class A unqualified
Table 12 Normal inspection secondary sampling plan
Batch range
>35001
35001500000
500001
35001-500:600
2500001
Acceptance quality limit
Number of samples
Acceptance quality limit
Judgment array
L12/13-02% (mass concentration) citric acid (CHO+H:O) solution Note: The test solution is prepared with analytical reagents and distilled water. Test conditions
100℃.30min
121,30min
121c.30min
7.5 Integrity test of external repair coating
Immerse the weld external repair coating in a mixed solution of 20% (mass concentration) copper sulfate (CuSO:·5H?O) and 10% (volume fraction) hydrochloric acid. After 1 minute, take out the sample, rinse it with clean water, dry it, and visually inspect it. 7.6 Internal coating integrity test
7.6.1 Instrument and electrolyte
7.6.1.1 Internal coating integrity tester: DC voltage 6.3V, minimum reading value not greater than 0.1mA7.6.1.2 Electrolyte: 2% (mass concentration) sodium sulfate solution, 1% (mass concentration) sodium fluoride solution. Note: The test solution is prepared with analytical reagents and distilled water7.6.2 Internal coating integrity test for cans
Use the internal coating integrity tester, connect the can to the positive electrode, add 2% (mass concentration) sodium sulfate solution in the can, insert a stainless steel rod 3mm from the can mouth to the negative electrode, and read the internal coating defect current value at the 4th second. 7.6.3 Integrity test of inner coating film of easy-open end and bottom cover 7.6.3.1 Easy-open end and bottom cover of aluminum alloy sheet: Use inner coating film integrity tester, use 1% (mass concentration) sodium fluoride solution to test, and read the inner coating film defect current value at the 4th second 7.6.3.2 Bottom cover of (chrome) thin steel sheet: Use inner coating film integrity tester, use 2% (mass concentration) sodium sulfate solution to test, and read the inner coating film defect current value at the 4th second. 7.7 Pressure test of tank body
Pour the tank into water, fill the tank with compressed air and slowly increase the pressure to the specified value (gauge pressure), maintain the pressure for 1min. After decompression, observe whether the tank body has permanent deformation
7.8 Sealing test of tank body
During the test, observe whether the tank body has leakage. 7.9 Quality inspection of dry sealant film
Use a balance with a sensitivity of 0.001g to weigh the sealed cover as W1. Remove the sealant and weigh it after drying as W. The quality of the dry sealant film (W) is equal to Wi minus W
7.10 Tests of the opening force and full opening force of aluminum easy-open covers Use a breaking force with a reading value not greater than 1N and a full opening force tester to test the cover. Read the maximum value when the pull ring is opened and when the pull ring is completely detached.
7.11 Opening reliability test of aluminum easy-open covers
After baking at 200.℃ for 5min and cooling, open the aluminum easy-open cover by hand or with simple tools. 7.12 Pressure resistance test of aluminum easy-open covers and bottom covers
Use a cover pressure resistance strength tester with a reading value not greater than 10kPa to slowly increase the pressure of the cover to 180kPa (gauge pressure), maintain the pressure for 1min, and observe whether the cover has permanent deformation after pressure relief.
7.13 Sealing test of aluminum easy-open end and bottom cover During the test in 7.12, observe whether the sample has leakage. 8 Inspection rules
8.1 Products of the same variety and specification delivered in the same batch are the same inspection batch. 8
GB/T17590—2008
8.2 Product inspection is divided into delivery inspection and type inspection. Products should be inspected at the time of delivery. 8.3 The items of delivery inspection are 6.16.2, and the items of type inspection are all the contents of Chapter 6. The product should be subject to type inspection when any of the following conditions exist: new products or old products are converted to trial production and type identification: when the structure, material, or process changes may affect product performance; normal production, inspection every six months: when production is resumed after a long period of suspension;
when the factory inspection results are significantly different from the last type inspection: when the national quality supervision agency proposes a requirement for type inspection, 8.4 The classification of unqualified aluminum easy-open ends, bottom covers, and can bodies is shown in Tables 8 and 9. Table 8 Classification of appearance defects of easy-open ends and bottom covers Category
Easy to open invoice, deer cover
Unqualified classification
Class A unqualified
Class B unqualified
Class C unqualified
Unqualified classification
Class A unqualified
Class B unqualified
Class C unqualified
8.5 Sampling plan
Defect content
Misreporting, broken glue, obvious oil stains and foreign matter on the inside of the cover, metal entanglement, coating separation or shedding, serious wrinkles on the edge, easy to open cover without pull ring.
Sealant contamination, partial coating leakage greater than 2mm, obvious deformation of hook edge, inner and outer coating film scratched and abraded but the metal leg is not exposed, the hook edge is slightly wrinkled and deformed, the sealant overlap is uneven, and the surface is rusted
Table 9 Classification of body appearance defects
Defect content
Obvious oil stains, foreign matter stains, metal curtains, cold welding, welding leakage, hole adjustment, breakdown, flange cracks, double curling, large edges, quick mouth
Inner film and inner patch coating have obvious bubbles and yellowing, the maximum concave size does not exceed 1cm, and no damage to the inner coating film is caused, obvious scratches, printed pattern sideways, inner printing color, incomplete curling, sealing, and cracks. There is a slight difference between the printing color and the sample, the printing pattern is slightly misaligned, there are small scratches that do not show the metal, the curling glue is overflowed, the welding joint is misaligned, the tail exceeds 0.5mm, and the surface is rusted. 8.5.1 The internal coating curing and corrosion resistance shall be inspected according to Table 10. Table 10 Sampling plan and judgment of internal coating curing and corrosion resistance inspection Name
Aluminum easy-open apple, bottom cover, can body
Inspection item
Internal coating curing
Resistance
Unqualified classification
Class A unqualified
Batch range
Number of samples
Judgment array
8.5.2 Other factory inspections The type inspection items are inspected according to the normal inspection secondary sampling plan in GB/T2828.1, see Table 11 and Table 12
GB/T175902008
Easy to open end, bottom cover
Inspection level
Table 11 Inspection level and acceptance quality limit (AQL) Inspection items
Quality of dry film of sealant
Integrity of inner coating
Opening force
Full opening force
Opening reliability
Compressive strength
Sealing
Double curling structure
Integrity of inner coating||tt| |Integrity of weld patch tape
Compressive strength
Sealing
Batch inspection set level
Unqualified classification
Class A unqualified
Class B unqualified
Class C unqualified
Class C unqualified
Class B unqualified
Class A unqualified
Class B unqualified
Class B unqualified
Class A unqualified
Class A unqualified
Class A unqualified
Class B unqualified
Class C unqualified
Class C unqualified
Qualified
Class A unqualified
Class A unqualified
Class A unqualified
Class A unqualified
Table 12 Normal inspection secondary sampling plan
Batch range
>35001
35001500000
500001
35001-500:600
2500001
Acceptance quality limit
Number of samples
Acceptance quality limit
Judgment array
L12/13-1. Aluminum alloy sheet easy-open cover and bottom cover: Use the inner coating integrity tester, use 1% (mass concentration) sodium fluoride solution for testing, and read the inner coating defect current value at the 4th second. 7.6.3.2. Class (chrome) thin steel sheet bottom cover: Use the inner coating integrity tester, use 2% (mass concentration) sodium sulfate solution for testing, and read the inner coating defect current value at the 4th second. 7.7 Tank pressure test
Put the tank into water, fill the tank with compressed air and slowly increase the pressure to the specified value (gauge pressure), maintain the pressure for 1min. After decompression, observe whether the tank has permanent deformation
7.8 Tank sealing test
During the test, observe whether the tank has leakage. 7.9 Quality inspection of dry sealant film
Use a balance with a sensitivity of 0.001g to weigh the sealed cover as W1. Remove the sealant and weigh it after drying as W. The quality of the dry sealant film (W) is equal to Wi minus W
7.10 Tests of the opening force and full opening force of aluminum easy-open covers Use a breaking force with a reading value not greater than 1N and a full opening force tester to test the cover. Read the maximum value when the pull ring is opened and when the pull ring is completely detached.
7.11 Opening reliability test of aluminum easy-open covers
After baking at 200.℃ for 5min and cooling, open the aluminum easy-open cover by hand or with simple tools. 7.12 Pressure resistance test of aluminum easy-open covers and bottom covers
Use a cover pressure resistance strength tester with a reading value not greater than 10kPa to slowly increase the pressure of the cover to 180kPa (gauge pressure), maintain the pressure for 1min, and observe whether the cover has permanent deformation after pressure relief.
7.13 Sealing test of aluminum easy-open end and bottom cover During the test in 7.12, observe whether the sample has leakage. 8 Inspection rules
8.1 Products of the same variety and specification delivered in the same batch are the same inspection batch. 8
GB/T17590—2008
8.2 Product inspection is divided into delivery inspection and type inspection. Products should be inspected at the time of delivery. 8.3 The items of delivery inspection are 6.16.2, and the items of type inspection are all the contents of Chapter 6. The product should be subject to type inspection when any of the following conditions exist: new products or old products are converted to trial production and type identification: when the structure, material, or process changes may affect product performance; normal production, inspection every six months: when production is resumed after a long period of suspension;
when the factory inspection results are significantly different from the last type inspection: when the national quality supervision agency proposes a requirement for type inspection, 8.4 The classification of unqualified aluminum easy-open ends, bottom covers, and can bodies is shown in Tables 8 and 9. Table 8 Classification of appearance defects of easy-open ends and bottom covers Category
Easy to open invoice, deer cover
Unqualified classification
Class A unqualified
Class B unqualified
Class C unqualified
Unqualified classification
Class A unqualified
Class B unqualified
Class C unqualified
8.5 Sampling plan
Defect content
Misreporting, broken glue, obvious oil stains and foreign matter on the inside of the cover, metal entanglement, coating separation or shedding, serious wrinkles on the edge, easy to open cover without pull ring.
Sealant contamination, partial coating leakage greater than 2mm, obvious deformation of hook edge, inner and outer coating film scratched and abraded but the metal leg is not exposed, the hook edge is slightly wrinkled and deformed, the sealant overlap is uneven, and the surface is rusted
Table 9 Classification of body appearance defects
Defect content
Obvious oil stains, foreign matter stains, metal curtains, cold welding, welding leakage, hole adjustment, breakdown, flange cracks, double curling, large edges, quick mouth
Inner film and inner patch coating have obvious bubbles and yellowing, the maximum concave size does not exceed 1cm, and no damage to the inner coating film is caused, obvious scratches, printed pattern sideways, inner printing color, incomplete curling, sealing, and cracks. There is a slight difference between the printing color and the sample, the printing pattern is slightly misaligned, there are small scratches that do not show the metal, the curling glue is overflowed, the welding joint is misaligned, the tail exceeds 0.5mm, and the surface is rusted. 8.5.1 The internal coating curing and corrosion resistance shall be inspected according to Table 10. Table 10 Sampling plan and judgment of internal coating curing and corrosion resistance inspection Name
Aluminum easy-open apple, bottom cover, can body
Inspection item
Internal coating curing
Resistance
Unqualified classification
Class A unqualified
Batch range
Number of samples
Judgment array
8.5.2 Other factory inspections The type inspection items are inspected according to the normal inspection secondary sampling plan in GB/T2828.1, see Table 11 and Table 12
GB/T175902008
Easy to open end, bottom cover
Inspection level
Table 11 Inspection level and acceptance quality limit (AQL) Inspection items
Quality of dry film of sealant
Integrity of inner coating
Opening force
Full opening force
Opening reliability
Compressive strength
Sealing
Double curling structure
Integrity of inner coating||tt| |Integrity of weld patch tape
Compressive strength
Sealing
Batch inspection set level
Unqualified classification
Class A unqualified
Class B unqualified
Class C unqualified
Class C unqualified
Class B unqualified
Class A unqualified
Class B unqualified
Class B unqualified
Class A unqualified
Class A unqualified
Class A unqualified
Class B unqualified
Class C unqualified
Class C unqualified
Qualified
Class A unqualified
Class A unqualified
Class A unqualified
Class A unqualified
Table 12 Normal inspection secondary sampling plan
Batch range
>35001
35001500000
500001
35001-500:600
2500001
Acceptance quality limit
Number of samples
Acceptance quality limit
Judgment array
L12/13-1. Aluminum alloy sheet easy-open cover and bottom cover: Use the inner coating integrity tester, use 1% (mass concentration) sodium fluoride solution for testing, and read the inner coating defect current value at the 4th second. 7.6.3.2. Class (chrome) thin steel sheet bottom cover: Use the inner coating integrity tester, use 2% (mass concentration) sodium sulfate solution for testing, and read the inner coating defect current value at the 4th second. 7.7 Tank pressure test
Put the tank into water, fill the tank with compressed air and slowly increase the pressure to the specified value (gauge pressure), maintain the pressure for 1min. After decompression, observe whether the tank has permanent deformation
7.8 Tank sealing test
During the test, observe whether the tank has leakage. 7.9 Quality inspection of dry sealant film
Use a balance with a sensitivity of 0.001g to weigh the sealed cover as W1. Remove the sealant and weigh it after drying as W. The quality of the dry sealant film (W) is equal to Wi minus W
7.10 Tests of the opening force and full opening force of aluminum easy-open covers Use a breaking force with a reading value not greater than 1N and a full opening force tester to test the cover. Read the maximum value when the pull ring is opened and when the pull ring is completely detached.
7.11 Opening reliability test of aluminum easy-open covers
After baking at 200.℃ for 5min and cooling, open the aluminum easy-open cover by hand or with simple tools. 7.12 Pressure resistance test of aluminum easy-open covers and bottom covers
Use a cover pressure resistance strength tester with a reading value not greater than 10kPa to slowly increase the pressure of the cover to 180kPa (gauge pressure), maintain the pressure for 1min, and observe whether the cover has permanent deformation after pressure relief.
7.13 Sealing test of aluminum easy-open end and bottom cover During the test in 7.12, observe whether the sample has leakage. 8 Inspection rules
8.1 Products of the same variety and specification delivered in the same batch are the same inspection batch. 8
GB/T17590—2008
8.2 Product inspection is divided into delivery inspection and type inspection. Products should be inspected at the time of delivery. 8.3 The items of delivery inspection are 6.16.2, and the items of type inspection are all the contents of Chapter 6. The product should be subject to type inspection when any of the following conditions exist: new products or old products are converted to trial production and type identification: when the structure, material, or process changes may affect product performance; normal production, inspection every six months: when production is resumed after a long period of suspension;
when the factory inspection results are significantly different from the last type inspection: when the national quality supervision agency proposes a requirement for type inspection, 8.4 The classification of unqualified aluminum easy-open ends, bottom covers, and can bodies is shown in Tables 8 and 9. Table 8 Classification of appearance defects of easy-open ends and bottom covers Category
Easy to open invoice, deer cover
Unqualified classification
Class A unqualified
Class B unqualified
Class C unqualified
Unqualified classification
Class A unqualified
Class B unqualified
Class C unqualified
8.5 Sampling plan
Defect content
Misreporting, broken glue, obvious oil stains and foreign matter on the inside of the cover, metal entanglement, coating separation or shedding, serious wrinkles on the edge, easy to open cover without pull ring.
Sealant contamination, partial coating leakage greater than 2mm, obvious deformation of hook edge, inner and outer coating film scratched and abraded but the metal leg is not exposed, the hook edge is slightly wrinkled and deformed, the sealant overlap is uneven, and the surface is rusted
Table 9 Classification of body appearance defects
Defect content
Obvious oil stains, foreign matter stains, metal curtains, cold welding, welding leakage, hole adjustment, breakdown, flange cracks, double curling, large edges, quick mouth
Inner film and inner patch coating have obvious bubbles and yellowing, the maximum concave size does not exceed 1cm, and no damage to the inner coating film is caused, obvious scratches, printed pattern sideways, inner printing color, incomplete curling, sealing, and cracks. There is a slight difference between the printing color and the sample, the printing pattern is slightly misaligned, there are small scratches that do not show the metal, the curling glue is overflowed, the welding joint is misaligned, the tail exceeds 0.5mm, and the surface is rusted. 8.5.1 The internal coating curing and corrosion resistance shall be inspected according to Table 10. Table 10 Sampling plan and judgment of internal coating curing and corrosion resistance inspection Name
Aluminum easy-open apple, bottom cover, can body
Inspection item
Internal coating curing
Resistance
Unqualified classification
Class A unqualified
Batch range
Number of samples
Judgment array
8.5.2 Other factory inspections The type inspection items are inspected according to the normal inspection secondary sampling plan in GB/T2828.1, see Table 11 and Table 12
GB/T175902008
Easy to open end, bottom cover
Inspection level
Table 11 Inspection level and acceptance quality limit (AQL) Inspection items
Quality of dry film of sealant
Integrity of inner coating
Opening force
Full opening force
Opening reliability
Compressive strength
Sealing
Double curling structure
Integrity of inner coating||tt| |Integrity of weld patch tape
Compressive strength
Sealing
Batch inspection set level
Unqualified classification
Class A unqualified
Class B unqualified
Class C unqualified
Class C unqualified
Class B unqualified
Class A unqualified
Class B unqualified
Class B unqualified
Class A unqualified
Class A unqualified
Class A unqualified
Class B unqualified
Class C unqualified
Class C unqualified
Qualified
Class A unqualified
Class A unqualified
Class A unqualified
Class A unqualified
Table 12 Normal inspection secondary sampling plan
Batch range
>35001
35001500000
500001
35001-500:600
2500001
Acceptance quality limit
Number of samples
Acceptance quality limit
Judgment array
L12/13-4 The classification of unqualified aluminum easy-open ends, bottom covers and can bodies is shown in Tables 8 and 9. Table 8 Classification of appearance defects of easy-open ends and bottom covers
Easy-open invoice and deer cover
Unqualified classification
Class A unqualified
Class B unqualified
Class C unqualified
Unqualified classification
Class A unqualified
Class B unqualified
Class C unqualified
8.5 Sampling plan
Defect content
Misreporting, broken glue, obvious oil stains and foreign matter on the inside of the cover, metal rust, coating separation or shedding, serious wrinkles on the edge, and no pull ring on the easy-open cover.
Sealant contamination, partial coating leakage greater than 2mm, obvious deformation of hook edge, inner and outer coating film scratched and abraded but the metal leg is not exposed, the hook edge is slightly wrinkled and deformed, the sealant overlap is uneven, and the surface is rusted
Table 9 Classification of body appearance defects
Defect content
Obvious oil stains, foreign matter stains, metal curtains, cold welding, welding leakage, hole adjustment, breakdown, flange cracks, double curling, large edges, quick mouth
Inner film and inner patch coating have obvious bubbles and yellowing, the maximum concave size does not exceed 1cm, and no damage to the inner coating film is caused, obvious scratches, printed pattern sideways, inner printing color, incomplete curling, sealing, and cracks. There is a slight difference between the printing color and the sample, the printing pattern is slightly misaligned, there are small scratches that do not show the metal, the curling glue is overflowed, the welding joint is misaligned, the tail exceeds 0.5mm, and the surface is rusted. 8.5.1 The internal coating curing and corrosion resistance shall be inspected according to Table 10. Table 10 Sampling plan and judgment of internal coating curing and corrosion resistance inspection Name
Aluminum easy-open apple, bottom cover, can body
Inspection item
Internal coating curing
Resistance
Unqualified classification
Class A unqualified
Batch range
Number of samples
Judgment array
8.5.2 Other factory inspections The type inspection items are inspected according to the normal inspection secondary sampling plan in GB/T2828.1, see Table 11 and Table 12
GB/T175902008
Easy to open end, bottom cover
Inspection level
Table 11 Inspection level and acceptance quality limit (AQL) Inspection items
Quality of dry film of sealant
Integrity of inner coating
Opening force
Full opening force
Opening reliability
Compressive strength
Sealing
Double curling structure
Integrity of inner coating||tt| |Integrity of weld patch tape
Compressive strength
Sealing
Batch inspection set level
Unqualified classification
Class A unqualified
Class B unqualified
Class C unqualified
Class C unqualified
Class B unqualified
Class A unqualified
Class B unqualified
Class B unqualified
Class A unqualified
Class A unqualified
Class A unqualified
Class B unqualified
Class C unqualified
Class C unqualified
Qualified
Class A unqualified
Class A unqualified
Class A unqualified
Class A unqualified
Table 12 Normal inspection secondary sampling plan
Batch range
>35001
35001500000
500001
35001-500:600
2500001
Acceptance quality limit
Number of samples
Acceptance quality limit
Judgment array
L12/13-4 The classification of unqualified aluminum easy-open ends, bottom covers and can bodies is shown in Tables 8 and 9. Table 8 Classification of appearance defects of easy-open ends and bottom covers
Easy-open invoice and deer cover
Unqualified classification
Class A unqualified
Class B unqualified
Class C unqualified
Unqualified classification
Class A unqualified
Class B unqualified
Class C unqualified
8.5 Sampling plan
Defect content
Misreporting, broken glue, obvious oil stains and foreign matter on the inside of the cover, metal rust, coating separation or shedding, serious wrinkles on the edge, and no pull ring on the easy-open cover.
Sealant contamination, partial coating leakage greater than 2mm, obvious deformation of hook edge, inner and outer coating film scratched and abraded but the metal leg is not exposed, the hook edge is slightly wrinkled and deformed, the sealant overlap is uneven, and the surface is rusted
Table 9 Classification of body appearance defects
Defect content
Obvious oil stains, foreign matter stains, metal curtains, cold welding, welding leakage, hole adjustment, breakdown, flange cracks, double curling, large edges, quick mouth
Inner film and inner patch coating have obvious bubbles and yellowing, the maximum concave size does not exceed 1cm, and no damage to the inner coating film is caused, obvious scratches, printed pattern sideways, inner printing color, incomplete curling, sealing, and cracks. There is a slight difference between the printing color and the sample, the printing pattern is slightly misaligned, there are small scratches that do not show the metal, the curling glue is overflowed, the welding joint is misaligned, the tail exceeds 0.5mm, and the surface is rusted. 8.5.1 The internal coating curing and corrosion resistance shall be inspected according to Table 10. Table 10 Sampling plan and judgment of internal coating curing and corrosion resistance inspection Name
Aluminum easy-open apple, bottom cover, can body
Inspection item
Internal coating curing
Resistance
Unqualified classification
Class A unqualified
Batch range
Number of samples
Judgment array
8.5.2 Other factory inspections The type inspection items are inspected according to the normal inspection secondary sampling plan in GB/T2828.1, see Table 11 and Table 12
GB/T175902008
Easy to open end, bottom cover
Inspection level
Table 11 Inspection level and acceptance quality limit (AQL) Inspection items
Quality of dry film of sealant
Integrity of inner coating
Opening force
Full opening force
Opening reliability
Compressive strength
Sealing
Double curling structure
Integrity of inner coating||tt| |Integrity of weld patch tape
Compressive strength
Sealing
Batch inspection set level
Unqualified classification
Class A unqualified
Class B unqualified
Class C unqualified
Class C unqualified
Class B unqualified
Class A unqualified
Class B unqualified
Class B unqualified
Class A unqualified
Class A unqualified
Class A unqualified
Class B unqualified
Class C unqualified
Class C unqualified
Qualified
Class A unqualified
Class A unqualified
Class A unqualified
Class A unqualified
Table 12 Normal inspection secondary sampling plan
Batch range
>35001
35001500000
500001
35001-500:600
2500001
Acceptance quality limit
Number of samples
Acceptance quality limit
Judgment array
L12/13-
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