FOrword
This document is drafted in accordance with GB/T 1.1-2020 Guidelines for Standardization - Part 1: Structure and Drafting Rules of Standardization Documents.
Please note that some of the contents of this document may involve patents. The issuing agency of this document does not assume the responsibility of identifying the patent. This document is proposed and under the centralized management of the National Technical Committee for Food Industry Standardization (SAC/TC 64).
1 Scope
This document specifies the quality requirements, test methods, inspection rules, marking, packaging, transportation and storage of tinned or chrome plated steel sheets for food containers.
This document is applicable to tinned or chrome plated steel sheet coated with paint and solidified at high temperature to form film for manufacturing food containers.
2 Normative References
The contents in the following documents, through normative references, constitute indispensable provisions of this document. Where, for dated references, only the version corresponding to that date applies to this document; For undated references, the latest version (including all amendments) is applicable to this document.
GB/T 1720-2020 Paint Film Scratch Test
GB/T 1732-2020 Determination of Impact Resistance of Paint Films
GB/T 2520 Cold Rolled Electrotinned Steel Sheet and Strip
GB/T 5206-2015 Paints and Varnishes, Terms and Definitions
GB/T 6682 Specification and Test Methods of Water for Analytical Laboratory
GB/T 6739 Paints and Varnishes - Determination of Film Hardness by Pencil Method
GB/T 24180 Cold Rolled Electroplated Chromium Steel Plate and Strip
YB/T 4286 Test Method for Friction Coefficient of Sheet and Strip of Metallic Materials
3 Terms and definitions
The following terms and definitions defined in GB/T 5206-2015 are applicable to this document.
three point one
The film thickness of the whole tin (or chromium) coated steel sheet is extremely poor.
three point two
tin melting
The color difference of tin metal occurs after the tin layer of thin steel plate melts.
three point three
Coking burn
The film is burnt and gelatinized due to high temperature.
three point four
Wax incorporation
Wax precipitation occurs on the film surface.
4 Quality requirements
4.1 Raw and auxiliary materials
4.1.1 Tinned or chrome plated steel sheet
The tinned steel sheet shall comply with the provisions of GB/T 2520 and relevant standards; Chromium plated steel sheet shall comply with the provisions of GB/T 24180 and relevant standards.
4.1.2 Paint
The paint used, such as enamel or varnish, shall comply with relevant standards.
4.1.3 Other auxiliary materials
It shall comply with relevant standards.
4.2 Technical requirements
4.2.1 Appearance
4.2.1.1 The coating film shall be smooth and flat, with consistent color, free of bubbles, wrinkles, orange peel, shrinkage cavity, cracks as defined in GB/T 5206-2015, as well as defects such as tin melting, coking, wax inversion, speckles, paint explosion, adhesive, foreign matters, dust accumulation, edge stacking, missing coating, poor leveling, dripping, pollution marks, rubber roller damage marks, etc. as defined in this document.
4.2.1.2 The coating film shall be free of such defects as scald, thick edge, thin edge (within 2.0 mm) impurities that affect the use.
4.2.1.3 There shall be no scratches penetrating the film.
4.2.1.4 The plain iron surface coated on one side should not have bracket print and tape.
4.2.1.5 The error of the position and width of the blank belt shall be less than 1.0 mm, and the blank part shall be free of material.
4.2.2 Film thickness
The film thickness is expressed by the film amount per unit area, in grams per square meter (g/m '), and the difference between the same plate and the same plate shall not be greater than 10% of the maximum coating thickness agreed by the supplier and the supplier.
5 Test method
5.1 Sample
The sample piece for physical and chemical inspection shall be cut with a cutter. See Fig. 1 for the sampling position and size.
6 Inspection Rules
6.1 Batching
The inspection shall be carried out according to the batch or group of goods. The products of the same specification delivered at a time are regarded as one batch. The same batch of goods can be divided into several cargo groups through negotiation between both parties, and the cargo groups shall be integral multiples of packages.
6.2 Inspection classification
Each batch of products shall be inspected by the inspection department of the manufacturer as per 4.2.1~4.2.14 before leaving the factory, and the product quality certificate shall be issued.
6.3 Inspection items
The products shall be accepted according to the cargo group.
7 Marking, packaging, transportation and storage
7.1 Marking
The outer package of the product shall be provided with the product inspection certificate and packing list, which shall include the manufacturer's mark and name, product name, product specification, production number, production date and quantity.
7.2 Packaging
7.2.1 The packaging shall meet the requirements for containerization and transportation. The packaging materials shall be clean and free from odor and pollution. 7.2.2 Packaging shall comply with the provisions of relevant standards.
7.2.3 Each product shall be bound firmly outside, and the original package should be used for transportation.
7.2.4 Raw and auxiliary materials and products that are easily affected by moisture regain in wet seasons shall be dampproof or packaged when necessary to prevent moisture regain damage.
7.3 Transportation
The transportation and handling tools shall be clean and dry, free from odor and pollution. During shipment, avoid rain, sun, moisture and damage.
7.4 Storage
7.4.1 The products shall be stored in a ventilated, dry and clean warehouse where the product storage temperature is higher than the dew point to avoid direct sunlight. 7.4.2 The storage period of products before tank (cover) making is 2 years (the storage period of low chromium iron and products coated on one side is 6 months).
Forword
1 Scope
2 Normative References
3 Terms and definitions
4 Quality requirements
5 Test method
6 Inspection Rules
7 Marking, packaging, transportation and storage
FOrword
This document is drafted in accordance with GB/T 1.1-2020 Guidelines for Standardization - Part 1: Structure and Drafting Rules of Standardization Documents.
Please note that some of the contents of this document may involve patents. The issuing agency of this document does not assume the responsibility of identifying the patent. This document is proposed and under the centralized management of the National Technical Committee for Food Industry Standardization (SAC/TC 64).
1 Scope
This document specifies the quality requirements, test methods, inspection rules, marking, packaging, transportation and storage of tinned or chrome plated steel sheets for food containers.
This document is applicable to tinned or chrome plated steel sheet coated with paint and solidified at high temperature to form film for manufacturing food containers.
2 Normative References
The contents in the following documents, through normative references, constitute indispensable provisions of this document. Where, for dated references, only the version corresponding to that date applies to this document; For undated references, the latest version (including all amendments) is applicable to this document.
GB/T 1720-2020 Paint Film Scratch Test
GB/T 1732-2020 Determination of Impact Resistance of Paint Films
GB/T 2520 Cold Rolled Electrotinned Steel Sheet and Strip
GB/T 5206-2015 Paints and Varnishes, Terms and Definitions
GB/T 6682 Specification and Test Methods of Water for Analytical Laboratory
GB/T 6739 Paints and Varnishes - Determination of Film Hardness by Pencil Method
GB/T 24180 Cold Rolled Electroplated Chromium Steel Plate and Strip
YB/T 4286 Test Method for Friction Coefficient of Sheet and Strip of Metallic Materials
3 Terms and definitions
The following terms and definitions defined in GB/T 5206-2015 are applicable to this document.
three point one
The film thickness of the whole tin (or chromium) coated steel sheet is extremely poor.
three point two
tin melting
The color difference of tin metal occurs after the tin layer of thin steel plate melts.
three point three
Coking burn
The film is burnt and gelatinized due to high temperature.
three point four
Wax incorporation
Wax precipitation occurs on the film surface.
4 Quality requirements
4.1 Raw and auxiliary materials
4.1.1 Tinned or chrome plated steel sheet
The tinned steel sheet shall comply with the provisions of GB/T 2520 and relevant standards; Chromium plated steel sheet shall comply with the provisions of GB/T 24180 and relevant standards.
4.1.2 Paint
The paint used, such as enamel or varnish, shall comply with relevant standards.
4.1.3 Other auxiliary materials
It shall comply with relevant standards.
4.2 Technical requirements
4.2.1 Appearance
4.2.1.1 The coating film shall be smooth and flat, with consistent color, free of bubbles, wrinkles, orange peel, shrinkage cavity, cracks as defined in GB/T 5206-2015, as well as defects such as tin melting, coking, wax inversion, speckles, paint explosion, adhesive, foreign matters, dust accumulation, edge stacking, missing coating, poor leveling, dripping, pollution marks, rubber roller damage marks, etc. as defined in this document.
4.2.1.2 The coating film shall be free of such defects as scald, thick edge, thin edge (within 2.0 mm) impurities that affect the use.
4.2.1.3 There shall be no scratches penetrating the film.
4.2.1.4 The plain iron surface coated on one side should not have bracket print and tape.
4.2.1.5 The error of the position and width of the blank belt shall be less than 1.0 mm, and the blank part shall be free of material.
4.2.2 Film thickness
The film thickness is expressed by the film amount per unit area, in grams per square meter (g/m '), and the difference between the same plate and the same plate shall not be greater than 10% of the maximum coating thickness agreed by the supplier and the supplier.
5 Test method
5.1 Sample
The sample piece for physical and chemical inspection shall be cut with a cutter. See Fig. 1 for the sampling position and size.
6 Inspection Rules
6.1 Batching
The inspection shall be carried out according to the batch or group of goods. The products of the same specification delivered at a time are regarded as one batch. The same batch of goods can be divided into several cargo groups through negotiation between both parties, and the cargo groups shall be integral multiples of packages.
6.2 Inspection classification
Each batch of products shall be inspected by the inspection department of the manufacturer as per 4.2.1~4.2.14 before leaving the factory, and the product quality certificate shall be issued.
6.3 Inspection items
The products shall be accepted according to the cargo group.
7 Marking, packaging, transportation and storage
7.1 Marking
The outer package of the product shall be provided with the product inspection certificate and packing list, which shall include the manufacturer's mark and name, product name, product specification, production number, production date and quantity.
7.2 Packaging
7.2.1 The packaging shall meet the requirements for containerization and transportation. The packaging materials shall be clean and free from odor and pollution. 7.2.2 Packaging shall comply with the provisions of relevant standards.
7.2.3 Each product shall be bound firmly outside, and the original package should be used for transportation.
7.2.4 Raw and auxiliary materials and products that are easily affected by moisture regain in wet seasons shall be dampproof or packaged when necessary to prevent moisture regain damage.
7.3 Transportation
The transportation and handling tools shall be clean and dry, free from odor and pollution. During shipment, avoid rain, sun, moisture and damage.
7.4 Storage
7.4.1 The products shall be stored in a ventilated, dry and clean warehouse where the product storage temperature is higher than the dew point to avoid direct sunlight. 7.4.2 The storage period of products before tank (cover) making is 2 years (the storage period of low chromium iron and products coated on one side is 6 months).
Contents of GB/T 41899-2022
Forword
1 Scope
2 Normative References
3 Terms and definitions
4 Quality requirements
5 Test method
6 Inspection Rules
7 Marking, packaging, transportation and storage