GB/T 29603-2024 (GB/T 29603-2013) PDF English
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General quality requirements for full aperture tinplate or ECCS easy open ends of food containers
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GB/T 29603-2013: Full aperture easy open end made of tinplate or ECCS---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT29603-2013
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 67.250
A 82
Full aperture easy open end made of tinplate or ECCS
Issued on: JULY 19, 2013
Implemented on: FEBRUARY 01, 2014
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 4
4 Product classification, code and main dimensional symbols... 5
5 Requirements... 7
6 Test methods... 11
7 Inspection rules... 15
8 Marking, packaging, transportation and storage... 18
Appendix A (Normative) Nominal diameter of main specifications of full aperture easy
open end made of tinplate or ECCS... 20
Appendix B (Normative) Sealant dry film mass of the product... 22
Full aperture easy open end made of tinplate or ECCS
1 Scope
This Standard specifies the terms and definitions, product classification, codes and main
dimensional symbols, requirements, test methods, inspection rules, as well as basic
requirements for marking, packaging, transportation and storage of full aperture easy
open end made of tinplate or ECCS.
This Standard applies to full aperture easy open end made of tinplate or ECCS for food
packaging.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 191, Packaging - Pictorial marking for handling of goods
GB/T 2520, Cold-reduced electrolytic tinplate
GB/T 2828.1, Sampling procedures for inspection by attributes - Part 1.Sampling
schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 6682, Water for analytical laboratory use - Specification and test methods
GB/T 24180, Cold-reduced electrolytic chromium/chromium oxide coated steel
sheet and strip
QB/T 1877, Tinplate prints for the packing and decoration
QB/T 2763, Coated tinplate (or ECCS)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
full aperture easy open end made of tinplate or ECCS
An end made of tinplate or ECCS as the main material, with a certain depth of notches
around the entire circumference of the capping or with full-circumferential and
e – capping depth;
b – hook-edge opening;
D – outer diameter of hook edge (divided into long-side outer diameter D1 and short-
side outer diameter D2 for special-shaped ends).
Figure 2 – Schematic diagram of main dimensions of the easy open end
5 Requirements
5.1 Raw and auxiliary materials
5.1.1 Tinplate or ECCS
5.1.1.1 Electrolytic tinplate shall comply with the regulations of GB/T 2520, and ECCS
shall comply with the regulations of GB/T 24180.That is, electrolytic tinplate or ECCS
that has been inspected online and are suitable for printing on the entire sheet under
normal storage conditions, and must not have the following defects.
a) pinholes penetrating the thickness of the steel sheet;
b) surface defects such as scars, pits, wrinkles, rust, etc. that may have an impact on
use;
c) shape defects that affect use.
5.1.1.2 In addition to the above requirements, there shall be specific requirements for
the tin coating weight, chromium plating amount, impact resistance, thickness, temper
and the allowable deviation of thickness and temper of electrolytic tinplate or ECCS.
Material specifications, parameters and quality requirements shall be agreed upon by
both parties.
5.1.2 Coated tinplate or ECCS
The inside and outside of the steel sheet shall be coated. The coating type and the film
property shall be agreed between the supplier and the buyer based on QB/T 2763 and
the characteristics of the content.
5.1.3 Ring tab material
Galvanized, tin-plated, chromium-plated steel sheets or aluminum-magnesium alloy
sheets with appropriate thickness, tensile strength and elongation, which shall also be
coated on both sides.
5.1.4 Coating
6 Test methods
The water used in this test method, unless otherwise required, refers to water of grade
3 or above in accordance with GB/T 6682 Water for analytical laboratory use -
Specification and test methods.
The reagents used in this test method are analytical reagents (AR) unless the
specifications are stated. Special requirements, if any, shall be clearly specified.
The solutions used in this test refer to aqueous solutions unless the solvent used to
prepare them is specified.
6.1 Dimensional determination
Use general or special measuring tools with an accuracy not greater than 0.01 mm to
measure.
6.2 Appearance quality
Visually inspect with normal vision under normal light.
6.3 Film property
6.3.1 Curability
6.3.1.1 Instruments and apparatuses
a) stainless steel cylinder;
b) steam sterilizer.
6.3.1.2 Test procedure
Immerse the sample cap in a stainless steel cylinder filled with distilled water; place the
stainless steel cylinder in a steam sterilizer; heat to 121 °C and maintain a constant
temperature for 30 minutes; naturally depressurize and cool; then, remove the sample
cap. Visually inspect the coating condition of the sample cap.
6.3.2 Corrosion resistance
6.3.2.1 Reagents and solutions
6.3.2.1.1 Citric acid solution (20 g/L)
Weigh 20 g of citric acid (C6H8O7·H2O); use water to dissolve and dilute to 1 000 mL.
6.3.2.1.2 Mixed solution A [mixed solution of L-cysteine hydrochloride (0.5 g/L),
potassium dihydrogen phosphate (3.6 g/L), and disodium hydrogen phosphate (7.2 g/L)]
Weigh 0.5 g of L-cysteine hydrochloride (C3H8NO2SCl) or 0.56 g of 1-hydrate L-
cysteine hydrochloride (C3H8NO2SCl·H2O), 3.6 g of potassium dihydrogen phosphate,
and 7.2 g of disodium hydrogen phosphate; dissolve them in water respectively; mix
and dilute to 1 000 mL. Use the solution within 4 hours after preparation.
6.3.2.2 Instruments and apparatuses
a) stainless steel cylinder with sealing cover;
b) steam high-pressure sterilizer.
6.3.2.3 Test procedure
6.3.2.3.1 Easy open ends for packaging acidic contents for atmospheric
sterilization
Immerse the sample cap in a stainless steel cylinder filled with citric acid solution; seal
it; place the stainless steel cylinder in a steam high-pressure sterilizer; heat to 100 °C
and keep the temperature constant for 30 minutes; naturally depressurize and cool; then,
remove the sample cap. Visually inspect the coating condition of the sample cap.
6.3.2.3.2 Easy open ends for packaging contents containing protein for high
pressure sterilization
Immerse the sample cap in the stainless steel cylinder containing mixed solution A; seal
it; place the stainless steel cylinder in a steam high-pressure sterilizer; heat to 121 °C
and keep the temperature constant for 60 minutes; naturally depressurize and cool; then,
remove the sample cap. Visually inspect the coating condition of the sample cap.
6.3.2.3.3 Easy open ends for packaging acidic or other contents for high pressure
sterilization
Immerse the sample cap in a stainless steel cylinder filled with citric acid solution; seal
it; place the stainless steel cylinder in a steam high-pressure sterilizer; heat to 121 ℃
and keep the temperature constant for 30 minutes; naturally depressurize and cool; then,
remove the sample cap. Visually inspect the coating condition of the sample cap.
6.3.3 Impact resistance
6.3.3.1 Reagents and solutions
Copper sulfate solution (50 g/L). Weigh 50 g of copper sulfate pentahydrate
(CuSO4·5H2O); use water to dissolve and dilute to 1 000 mL.
6.3.3.2 Instruments and apparatuses
a) beaker (1 000 mL);
b) ceramic ware or glassware.
Lift the ring tab to break the engraved line, and push the ring tab to the bottom in the
opening direction; then, lift the ring tab and pull it back to open the sample cap; observe
the ring tab of the sample cap.
6.4.4 Enamel rate
6.4.4.1 Reagents and solutions
Sodium sulfate solution (20 g/L). Weigh 20 g of sodium sulfate (Na2SO4); use water to
dissolve and dilute to 1 000 mL.
6.4.4.2 Instruments and apparatuses
Film integrity tester. accuracy not greater than 0.1 mA.
6.4.4.3 Test procedure
Use the film integrity tester for testing; pour the sodium sulfate test solution, and
measure the internal film defect current value of the sample cap at the 4th second at a
working voltage of 6.3 V.
6.5 Sealant dry film properties
6.5.1 Dry film mass and moisture content
6.5.1.1 Instruments and apparatuses
a) analytical balance. accuracy 0.000 1 g;
b) oven.
6.5.1.2 Test procedures for determining dry film mass
Use an analytical balance to weigh the sample cap without removing the sealant dry
film; record the sample cap mass (W1); after removing the sealant dry film, use the
analytical balance to weigh the sample cap mass (W2) again. Calculate the dry film
mass (W) according to Formula (1).
Where.
W – sealant dry film mass, in milligrams (mg);
W1 – mass of the sample cap without removing the sealant dry film, in milligrams (mg);
W2 – mass of the sample cap after removing the sealant dry film, in milligrams (mg).
6.5.1.3 Test procedures for determining moisture content
Use an analytical balance to weigh the sealant dry film peeled off from the sample cap,
and record it as W3; place the sealant dry film in an oven and dry it at 125 °C for 30
minutes to a constant weight, and weigh it again, and record it as W4.Calculate the
moisture content (X%) of the sealant film according to Formula (2).
Where.
X – moisture content of the sealant film, %;
W3 – mass of the sealant dry film removed from the sample cap, in milligrams (mg);
W4 – mass of the sealant dry film removed from the sample cap after drying, in
milligrams (mg).
6.5.2 Water resistance
6.5.2.1 Test procedure
Immerse the sample cap in water at 100 °C for 20 minutes; take it out; visually observe
the condition of the sealant dry film.
6.5.3 Oil resistance
6.5.3.1 Reagents and solutions
Edible grade vegetable oil (salad oil).
6.5.3.2 Test procedure
Immerse the sample cap in a vegetable oil bath at 120 °C ~ 130 °C; keep it for 20
minutes; take it out; visually observe the condition of the sealant film.
7 Inspection rules
7.1 Group or batch
Inspection shall be carried out by batches or groups. Products of the same specifications
delivered at one time are considered to be one batch. A batch can be divided into several
groups through negotiation between both parties. A group shall be an integral multiple
of the packages.
7.2 Inspection classification
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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