GB/T 14251-2017 General Technical Requirements for Metal Containers for Canned Food GB/T14251-2017 |tt||Standard compression package decompression password: www.bzxz.net
This standard specifies the terms and definitions, product classification, quality requirements, food safety requirements, test methods, inspection rules, marking, packaging, transportation and storage of metal containers for canned food. This standard applies to canned food empty and full can containers made of tin-plated or chrome-plated steel sheets and aluminum alloy sheets.

ICS67.250
National Standard of the People's Republic of China
GB/T14251—2017
Replaces GB/T14251—1993
General technical standard for metal container of canned food food2017-09-07 Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Standardization Administration of China
2018-10-01 Implementation
Normative references
Terms and definitions
Product classification
Quality requirements
Food safety requirements
Test methods
Inspection rules…
Marking, packaging, transportation and storage
Appendix A (Normative Appendix) Quality requirements for pure copper round wire used for welding canned metal containers Appendix B (Informative Appendix) Calculation method and table lookup method for overlap length and overlap rate GB/T14251—2017
This standard is in accordance with GB/T1 .1-2009 drafting of GB/T14251-2017
This standard replaces GB/T14251-1993 "Technical conditions for tinned thin steel round canned containers". Compared with GB/T14251--1993, the main technical changes are as follows:
The name of the standard has been modified;
The scope of application of the standard has been expanded (see Chapter 1, Chapter 1 of the 1993 edition); - The terms "film iron", "film-coated aluminum", "can body", "three-piece can", "two-piece can", "shallow punched two-piece can", "plain iron can", "coated iron can", "coated aluminum can", "film-coated iron can", "film-coated aluminum can", "round can", "special-shaped can", "expanded can", "straight can", "neck-shrinking can", "welded can", "rolled can", "expanded can", "rolled can" have been added "Easy to open lid", "easy to tear lid", "can lid", "re-coating tape", "burr", "cold welding", "pinhole", "breakdown", "integrity of inner coating", "double curling", "body hook involvement rate", "lid hook involvement rate", "external glue extrusion", "convex corner", "weld misalignment", "weld tailing", "can inner wall corrosion", "even hook corrosion", "concentrated corrosion", "abnormal corrosion" (see 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 3.10, 3.11, 3.12, 3.13, 3.14, 3.15, 3.16, 3.17, 3.18, 3.19, 3.20, 3.21, 3.22, 3.23, 3.24, 3.25, 3.26, 3.27, 3.28, 3.30, 3.31, 3.48, 3.49, 3.50, 3.54, 3.56, 3.57, 3.63, 3.64, 3.65 and 3.66); deleted the terms "rust can", "edges and corners", "joint cover hook integrity", "filler extrusion", "tin path roughness", "tin accumulation", "weld sand holes" and "protruding corners" (see 3.1, 3.2, 3.15, 3.16, 3.17, 3.18, 3.19 and 3.23 of the 1993 edition); added product classification (see Chapter 4);
modified the quality requirements (see Chapter 5, Chapter 4 of the 1993 edition); added food safety requirements (Chapter 6); - modified the analysis methods (see Chapter 7, Chapter 5 of the 1993 edition); modified the inspection rules (see Chapter 8, Chapter 6 of the 1993 edition); modified Appendix A.
This standard is proposed and managed by the National Technical Committee for Standardization of Food Industry (SAC/TC64). The drafting units of this standard are: O.R.G. Packaging Co., Ltd., Yiwu Yikai Cap Industrial Co., Ltd., Hainan Entry-Exit Inspection and Quarantine Bureau, Xiamen Yinlu Food Group Co., Ltd., Jiamei Food Packaging (Chuzhou) Group, Shengxing Group Co., Ltd., Fujian Fuzhen Metal Packaging Co., Ltd., Fujian Biaoxin Group (Zhangzhou) Canning Co., Ltd., China Food Fermentation Industry Research Institute, China Canning Industry Association. The main drafters of this standard are: Chen Yufei, Wang Xiaohua, Wang Yujian, Lei Yiju, Fan Zhilong, Xi Zhilan, Chen Huiyong, Zhang Shusheng, Zhang Zuoquan, Qiu Kai, Du Jie, Wu Gang, Huang Xi
The previous versions of the standards replaced by this standard are: -GB/T14251—1993.
1 Scope
General Technical Requirements for Metal Containers for Canned Food GB/T14251—2017
This standard specifies the terms and definitions, product classification, quality requirements, food safety requirements, test methods, inspection rules, marking, packaging, transportation and storage requirements for metal containers for canned food. This standard applies to empty and full can containers for canned food made of tin-plated or chrome-plated steel sheets and aluminum alloy sheets. 2 Normative References
The following documents are indispensable for the application of this document. For all dated references, only the dated version applies to this document. For all undated references, the latest version (including all amendments) applies to this document. GB/T2828.1 Sampling inspection procedures by attributes Part 1: Sampling plan for batch inspection based on acceptance quality limit (AQL) GB4806.9 National food safety standard Metal materials and products for food contact GB/T5231-2012 Grades and chemical composition of copper and copper alloys GB/T6682 Specifications and test methods for water used in analytical laboratories QB/T2763-2006 Tinned (or chromium) coated steel sheets 3 Terms and definitions
The following terms and definitions apply to this document. 3.1
Laminated steel
A composite material with the dual properties of polymer materials and metal materials, formed by attaching a layer of polymer film to the surface of tinned or chromium-plated steel sheets by melting or gluing. 3.2
Laminated aluminum
A composite material with the dual properties of polymer materials and metal materials, formed by laminating a layer of polymer film on the surface of aluminum alloy sheet by melting or gluing.
Can body
A container formed by combining a metal can body with a top cover or bottom cover or by stamping and drawing a whole piece of metal sheet. 3.4
three-piece can
A packaging container made of a metal top cover, a can body and a bottom cover3.5
two-piece can
A container formed by stamping and drawing the can bottom and can body with a whole piece of metal sheet and sealed with a metal top cover3.6
shallow-drawn two-piece can
two-piece drawn car
a packaging container formed by stamping and drawing the can bottom and can body with a whole piece of metal sheet and a metal top cover, the ratio of the can height to the 1
GB/T14251—2017
can diameter is less than 1.
plain tin plate can
a packaging container made of tin-plated thin steel plate with no coating or film on the inner wall. 3.8
Coated steel can
A packaging container whose body is made of tinned (chrome) steel sheet with a coating on the inner wall. 3.9
Coated aluminium can
Coated aluminium can
A packaging container whose body is made of aluminium alloy sheet with a coating on the inner wall 3.10
laminated steelcan
Laminated steel can
A packaging container whose body is made of laminated iron material. 3.11
laminated aluminum can
laminated aluminum can
The can body is made of laminated aluminum material. 3.12
Metal can with round rod shape
Special-shaped can
rregular can
The general shape of non-cylindrical metal can
Expanding can
Expanding can
The top cross-section of the can body
Straight can
The largest can, use the largest straightwall can
The can body has a constant cross-sectional diameter from top to bottom, 3.16
necked-in can
can
Can with reduced cross-sectional diameter at one or both ends of the can body 3.17
Striped can
Can with welded can body welded can. 3.18
Beaded can
Beaded can
Metal can with multiple regular concave and convex ridges rolled on the can body. 3.19
Expanded can
Expanded can
A metal can whose body is expanded after being rounded to obtain better rigidity or appearance. 3.20
Key open can
A metal can with a pre-scored upper portion of the body and a tongue-shaped tab, which can be rolled open with a can opener key. 2
Easy to open lid easyopencnend;EOE
GB/T14251—2017
Made of aluminum alloy sheet, tin-plated or chrome-plated steel sheet, with a score at the opening position and a pull ring riveted to facilitate opening. Easy to tear lid easypeelableend;EPE
Made of a lid ring made of aluminum alloy sheet or tin (chrome)-plated steel sheet and an aluminum-plastic composite material or polymer film, which can tear the aluminum-plastic film when opened.
End
Top and bottom cover
Metal can components, used as the top or bottom cover of three-piece metal cans. 3.24
Stripe
An anti-corrosion coating applied on the weld and its two sides by liquid roller coating, spray coating or powder electrostatic spraying. 3.25
Splash
The formation formed by the molten metal being squeezed out due to the high welding temperature, which makes the center temperature of the weld reach or exceed the melting point of iron. When the formation is located on the tank wall, it is called a splash point.
Cold weld
False weld or virtual weld
Due to the low welding temperature, the welded parts of the two thin steel plates fail to reach the plastic melting (tin is melted) state. 3.27
Pinhole
During welding, the hot melt tin-plated steel sheet cools slower than the tin-plated steel sheet, forming a penetrating hole. 3.28
Punch
Individual welding points in the weld are melted and perforated due to the sudden excessive welding current (such as caused by residual coating, etc.). 3.29
Missing welding
The state where one or more welding points in the weld have no current or the current is too small and cannot be fused. 3.30
Inner coating integrity
enamelratevalue;ERv
Due to factors such as raw materials and processing technology, the inner coating surface has defects such as micropores and scratches, which are expressed by the conduction current value caused by the defects.
Double seam
Double seam
Through the operation of the first roller and the second roller, the flange of the can body and the hook edge of the top (bottom) cover are hooked and pressed to form a sealing structure. The double seam is composed of three layers of top (bottom) cover thickness and two layers of can body thickness. 3.32
Faulty score
The score of the can body is defective, resulting in leakage of the can body, or the can cannot be opened or rolled to the end, and the external iron printing paint is seriously exploded due to the score.
GB/T14251—2017
deadhead;spinner;skidder;slipseamIncomplete seam
During the can sealing process, the local seam is not completely pressed due to the slippage of the pressure head or the poor rotation of the roller. See Figure 1.
Normal seam
Jumped seam
Incomplete seam
Incomplete seam
Because the seam at the weld is thick, the roller skips over the weld and fails to press the seam. See Figure 2.
Seam at the joint
Figure 2 Jumped seam
False seam
The folded cover hook presses the folded body hook tightly, but the seam is not hooked together. See Figure 3.
Figure 3 False seam
Knocked-downflange;softcrabGB/T14251—2017
When sealing the can, due to the serious collision of the can body flange or the edge of the can cover, the can body and the can cover are not hooked together, and there is a clear phenomenon of the can body flange exposed at the bottom of the flange.
See Figure 4.
Figure 4 Large collapsed edge
Sharp edge sharpseam
The edge on the inner side of the top of the curling edge. See Figure 5.
Cut-over
When the sharp edge reaches the level of metal sheet fracture, see Figure 5. Sharp
Sharp edge and quick mouth
Curling "teeth"
vee;pinlip
Poor sealing of the can, the cover hook and the body hook are partially not overlapped, and the V-shaped protrusion formed at the lower edge of the curling edge. See Figure 6.
Curling "teeth"
GB/T14251—2017
Droop
Due to poor sealing of the can, the tongue-shaped part that affects the appearance is clearly exposed at the lower edge of the curling edge. See Figure 7. Hour
Figure 7 Iron tongue
Droop at juncture
The iron tongue that exceeds 20% of the curling width at the can body weld is called a droop. See Figure 8. Figure 8 Droop
Cutseam;fractured seam
The phenomenon of the outer metal sheet of the curling being broken due to poor can sealing, generally occurs at the can body weld. See Figure 9.
Cutseam
Double line
The double line mark of the curling roller that obviously damages the metal sheet at the lower edge of the curling. 6
Verlaplength; OL
The length of the inner cover hook and the body hook of the curling overlap each other to form an overlapping state. Overlap ratio overlappercent
The degree of overlap between the body hook and the cover hook inside the curling, expressed as a percentage. Wrinklerating
GB/T14251—2017
After the hem is disassembled, the uneven wrinkle degree of the inner side of the cover hook accounts for the proportion of the entire cover hook length, expressed as a percentage. The wrinkles do not include the traces left after the wrinkles are rolled flat during the hem process. See Figure 10.3.47
Tightness rating
After the hem is disassembled, the flat part of the inner side of the cover hook accounts for the proportion of the entire cover hook. See Figure 10.1020
506070
Figure 10 Wrinkle and tightness
Body hook butting: The percentage of the can body hook at the overlap of the BHB seam to the theoretical body hook length. 3.49
cover hook butting;CHB
cover hook involvement rate
the percentage of the can cover hook at the overlapped seam to the theoretical cover hook length. 3.50
external squeezing of compound the phenomenon of sealant exposed at the bottom edge of the outer curling edge of the can. 3.51
internal squeezing of compound the phenomenon of sealant exposed at the inner curling groove of the can container. 3.52
leaked can
wrinkle degree/%
tightness/%
the phenomenon of leakage caused by defects in the sealing of the can, or damage to the seal due to impact, or perforation of the can wall due to corrosion. 3.53
dent can
the phenomenon of significant deformation of the can due to external force or excessive vacuum. 7
GB/T 14251—2017
Angular bulge
The phenomenon of angular protrusions on the bottom or top cover of canned containers. 3.55
scratches
Wear or scratches on the tinned layer, coating, coating or external printed paint film caused by external friction or damage. 3.56
Weld misalignment
off-setbzxZ.net
The phenomenon of uneven weld ends due to poor end face overlap. 3.57
Weld tail
fishtail
The phenomenon of protruding weld tails due to poor welding. 3.58
Lacqueroff
The coating inside the can is flaked off due to corrosion or mechanical action, or the coating has been separated from the metal sheet in pieces but has not fallen off. 3.59
Ferric sulphide
The sulfur compound in the content reacts with the iron substrate of the can to form a 3.60
A loose, easily detached black substance.
Sulphide stain
Sulphide stain
The brownish purple tin sulfide stain produced by the reaction of the sulfide-containing substances in the contents with the tin layer of the can wall. 3.61
Oxidation cirdle
Oxidation cirdle
The dark corrosion zone that appears at the ends of the inner wall of the can or at the liquid surface at the ends after the can is opened
Swelled can
The phenomenon that the can cover, one end or both ends of the can bottom, and the can body bulge outwards due to the electrochemical reaction in the can, the gas produced by microbial activity, or physical reasons.
corrosion inside the can
Corrosion inside the can
The inner wall of the can reacts with the contents to produce chemical or electrochemical corrosion, causing metal ions to enter the contents. 3.64
Uniform corrosion
detinning
The inner wall of the plain iron can has a uniform tin melting phenomenon, and its surface shows light gray tin particles. 3.65
Pitting
The inner wall of the can has a dotted or flake tin or iron melting phenomenon. 3.66
AbnormallyrapiddetinningAfter a short period of storage, the inner wall of the can quickly melts tin, and its entire surface shows dark gray to black corrosion marks. 8
4 Product classification
4.1 According to the type of substrate, it is divided into tin-plated thin steel plate cans, chrome-plated thin steel plate cans, and aluminum alloy thin plate cans. 4.2 According to the characteristics of the inner wall of the can body, it is divided into plain iron cans, coated iron cans, coated aluminum cans, coated iron cans, and coated aluminum cans. 4.3 According to the container structure, it is divided into three-piece cans and two-piece cans. See Figure 11 for examples.
Three-piece can
Figure 11 Schematic diagram of the structure of three-piece can and two-piece can b)
Two-piece can
4.4 According to the shape of the container, it is divided into round cans and special-shaped cans (square cans, oblong cans, oval cans, horseshoe cans, trapezoidal cans, etc.). See Figure 12 for examples.
a) Round can
d) Oval can
b) Square can
e) Trapezoidal can
Schematic diagram of the cross section of round cans and special-shaped cans
5. According to the shape of the can body, it is divided into straight cans, tapered cans, necked cans, flared cans, rolled cans, expanded cans, etc. See Figure 13 for examples.
GB/T14251-2017
Oval can
Horseshoe can
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.