GB/T 36003-2018Food can made of tinplate or electrolytic chromium-coated steel(ECCS) (English PDF)

3.1 Plain tinplate can

The can body is made of uncoated tinplate (i.e., the interior surface lacks a coating), but an internal strip may be applied to protect the weld seam.

3.2 Lacquered tinplate can

A can in which the can body and the inner surface of the lid are made of coated tinplate or electrolytic chromium-coated steel.

3.3 Striped can

A can with touch-up coating applied to the weld seam of the can body.

3.4 Stripe

An anti-corrosion coating that is applied to the weld seam and the areas on both sides of it by means of roller coating, spraying, or electrostatic spraying.

3.5 Enamel rate

One of the indicators characterizing the integrity of the internal coating film; specifically, the value of the conducted current resulting from micropores or damage on the internal coating film surface caused by raw materials or the manufacturing process.

5.1 Tinplate

The tinplate shall comply with the provisions of GB/T 2520; its basic characteristics shall be confirmed by both the supplier and the purchaser.

5.2 Electrolytic chromium-coated steel

The electrolytic chromium-coated steel shall comply with the provisions of GB/T 24180; its basic characteristics shall be confirmed by both the supplier and the purchaser.

5.3 Coated tinplate (or ECCS)

Internal coating mass and intra-sheet variation, adhesion, impact resistance, acid resistance, and sulfur resistance shall comply with the provisions of QB/T 2763. The printing quality of the tinplate (or ECCS) shall comply with the requirements of QB/T 1877.

5.4 Sealant

Hygienic indicators shall meet the requirements of GB 9685 and GB 4806.1; and it shall be suitable for the characteristics of the intended contents.

5.5 Coating film and paint

5.5.1 Hygienic indicators for internal coating film shall meet the requirements of GB 9685 and GB 4805, and it shall be suitable for the characteristics of the intended contents.

5.5.2 Hygienic indicators for release coatings shall meet the requirements of GB 9685 and GB 9682; and it shall possess anti-stick properties.

6.1 Basic requirements

6.1.1 Depending on the variety and origin of the contents and the filling process, physicochemical properties requirements regarding the base steel grade, tin coating mass, passivation film, type and thickness of internal coating film, and sealant for the tinplate (or ECCS) will vary. The manufacturer shall provide sample cans to the purchaser for filling tests and obtain confirmation.

6.1.2 When using plain tinplate cans to pack mushrooms, chemically passivated tinplate shall be used; the surface chromium content shall not exceed 1.5 mg/m², and the cans shall be manufactured from tinplate produced within the preceding 12 months.

6.2 Specifications and dimensions

6.2.1 Easy-open lid

The specifications and dimensions of easy-open lid intended for use with empty cans shall meet the requirements of GB/T 29603-2013.

6.2.2 Common specifications for empty cans

Refer to Appendix A for common specifications of empty cans.

6.2.3 Three-piece round cans

6.2.3.1 The main specifications, dimensions, and limit deviations for round cans are shown in Figure 4 and Table 2.

6.3

b) The double-seam shall be smooth and uniform; the seam area shall be free from sharp edges, false seams, and major collapsed edges, as well as defects such as incomplete seams, "teeth," "tongues," skipped seams, seam fractures, compound squeeze-out, sharp edges, "droops," and double lines, etc.

c) The weld seam shall be flat and smooth, free from cold welds or pinholes; the inner side of the weld seam shall be free from spatter; the sum of the tailing and misalignment at the weld seam ends shall not exceed 0.5 mm; and the touch-up coating shall be intact.

d) Printed patterns and text shall be clear, intact, smooth, and accurately registered; barcodes shall comply with relevant standards and regulations. For cans without external printing, the external tin coating shall be intact, with no abrasions exposing the base metal.

e) For plain tinplate cans, the internal tin coating shall be free from abrasions exposing the base metal.

6.3.2 Appearance quality requirements for easy-open lids and bottom lids. The structure shall be intact and complete; the curled edge shall be free from significant wrinkles or deformation; the lid surface shall be clean and free from contamination; and the sealant shall be uniform, intact, and free from foreign odors.

6.4 Performance

6.4.1 Quality of internal and external coating films on can bodies, easy-open lids, and bottom lids

6.4.1.1 After the curing test, the internal coating films shall show no whitening, peeling, or detachment; the external coating films shall show no significant whitening, peeling, or detachment; and printed patterns shall show no significant fading or loss of gloss.

6.4.1.2 Based on the characteristics of the contents and the requirements of the sterilization process, the can body and lid shall meet the following requirements after undergoing corrosion resistance tests.

a) Through the acid resistance test. The internal coating film shall show no whitening, peeling, detachment, or significant corrosion.

b) Through the sulfur resistance test. The internal coating film shall show no peeling or detachment. No sulfur staining shall be present on flat surfaces; slight sulfur staining is permissible at bends, expansion rings, necking areas, or reinforcing ribs, provided that […]