GB/T 36392-2025Coated paper and board for food packaging (English PDF)

1 Scope

This document specifies the requirements, inspection rules, marking, packaging, transportation and storage of coated paper and board for food packaging. It also describes the corresponding test methods and provides information regarding abbreviations and classification.

This document is applicable to the production, inspection, and sales of coated paper and board for food packaging, which is made from paper as a base material, and coated on one or both sides with PE, PP, PET, PBS, PLA, PHA or PBAT. Other coated paper and board, laminated paper and board for food packaging may take this Standard as a reference.

2 Normative References

GB/T 450

GB/T 451.1

GB/T 451.2

GB/T 451.3

GB/T 462

GB/T 1535

GB/T 2828.1

GB/T 6682

GB/T 7705

GB/T 7706

GB/T 7975

GB/T 10342

GB/T 10739

GB/T 14216

GB/T 17497.1

GB/T 31905

GB/T 39951

3 Terms and Definitions

This document does not have terms or definitions that need to be defined.

4 Abbreviations

The following abbreviations are applicable to this document.

PBAT. poly (butylene adipate terephthalate) PBS. poly (butylene succinate) PE. polyethylene PET. poly (ethylene terephthalate) PHA. polyhydroxyalkanoate PLA. poly (lactic acid) PP. polypropylene

5 Classification

5.1 The coated paper and board for food packaging are classified by use into Type I, Type II and Type III. Type I is low-weight coated paper used for packaging hamburgers and pastries, etc.; Type II is coated paper used for processing paper bags for dried fruits, drinking water or other ready-to-eat foods; Type III is high-weight coated paper and board used for processing paper cups, paper bowls and paper lunch boxes, etc.

7 Test Methods

9 Marking, Packaging, Transportation and Storage

9.1 Product marking shall comply with the provisions of GB/T 10342 and shall also indicate the product type and intended use. The form of quantitative marking for single-sided coated paper and board is “base paper quantitative + film quantitative”, and for double-sided coated paper and board is “front film quantitative + base paper quantitative + back film quantitative”.

9.2 Product packaging shall comply with the provisions of GB/T10342, and the outer packaging shall be wrapped with plastic film or kraft paper.

9.3 During handling, loading and unloading, the products shall not be hooked or flattened with a grafter, and paper items shall not be dropped from heights.

9.4 Products shall be transported using covered and clean transport vehicles and shall not be mixed with contaminating items.

Appendix A Appendix A

(normative) Determination of Adhesion A.1 Materials and Tools A.1.1 Knife.

A.1.2 Translucent graph paper, with a division value of 1 mm2. A.2 Specimen Collection A.2.1 For rolled coated paper and board for food packaging, randomly cut a specimen with a longitudinal length of 1 m and full width from the sample. Cut the specimen along the horizontal scroll into at least three 80 mm wide specimen strips. Lay the specimen strips flat on a table with the coated surface (food contact surface) facing up.

A.2.2 For flat coated paper and board for food packaging, cut the specimen into at least 3 square sheets with an area of at least 400 cm2.If the area of a single specimen sheet is less than 400 cm2, multiple specimens may be taken and combined to ensure that the total area meets the test requirements. A.3 Test Procedures A.3.1 Rolled coated paper and board for food packaging Starting from one corner of the specimen, use a knife (A.1.1) to separate the base paper from the film. Slowly peel the base paper and the film apart longitudinally across the full width of the specimen. After separating the two, place translucent graph paper (A.1.2) on the surface of the film where paper fibers are adhered. Respectively count the total area (S0) of the film removed and the area (S1) of the film surface where paper fibers are adhered. Repeat the determination for 3 specimens.

A.3.2 Flat coated paper and board for food packaging Starting from one corner of the specimen, use a knife (A.1.1) to separate the base paper from the film. Slowly tear off the film, then, place translucent graph paper (A.1.2) on the surface of the film where paper fibers are adhered. Respectively count the total area (S0) of the film removed and the area (S1) of the film surface where paper fibers are adhered. Repeat the determination for 3 specimens. A.4 Calculation of Results In accordance with Formula (A.1), calculate the adhesion of the specimen.

Appendix D Appendix D

(normative) Determination of Leakage Performance D.1 Materials D.1.1 Soybean oil, GB/T 1535, Grade 1. D.2 Specimen Collection Cut three 200 mm  200 mm specimens from each sample. The selected specimens shall be representative. D.3 Selection of Test Fluid The test fluid shall be selected based on the intended use of the product. for coated paper and board used for the processing of disposable drinking water bags, select water at (23  1) °C; for coated paper and board used for the processing of paper cups, select water at (23  1) °C or (90  5)°C; for coated paper and board used for the processing of paper bowls, select a mixture of soybean oil (D.1.1) and water at (95  5)°C; for coated paper and board used for the processing of paper lunch boxes, select soybean oil (D.1.1) at (95  5)°C; for coated paper and board used for other purposes, the test fluid can be selected based on the intended use. D.4 Test Procedures D.4.1 Conduct the test at 15 °C ~ 30 °C. Take a specimen, fold it on all four sides, and glue the four corners securely together to make a specimen box with a bottom surface length and width of 100 mm and a height of 50 mm on all four sides. Place the box on a dry glass plate or flat plate lined with filter paper. To avoid water vapor generated within the contact area between the bottom of the specimen and the dry glass plate or flat plate from affecting the test results, the specimen should be placed above two parallelly placed bars on the surface of the dry glass plate or flat plate, ensuring a certain distance between the bottom of the specimen and the surface of the dry glass plate or flat plate lined with filter paper.

D.4.2 Pour the test liquid into the specimen box, fill it to 10 mm from the top edge. After allowing it to sit for 30 minutes, observe the glass plate or flat plate for any water (or oil) seepage marks. During the test, oil may seep upward along the specimen. It shall be ensured that the top port of the specimen box is free of oil, otherwise, the oil may seep from the top port and affect the test results.

NOTE. when testing coated paper and board used for processing paper bowls, first, pour 30.0 g of soybean oil into the specimen box. Then, add water at (95  5) °C to a depth of 10 mm from the top edge of the specimen box.

Appendix E Appendix E

(normative) Determination of Wetting Tension E.1 Materials E.1.1 Dyne pen, No. 38 (corresponding to a wetting tension of 38.0 mN/m).

E.1.2 Flat glass, 300 mm  300 mm.

E.1.3 Stopwatch, with a division value of 0.1 s. E.2 Specimen Collection For each sample, cut two 150 mm  150 mm specimens, and mark the printed surface. The selected specimens shall be representative. E.3 Test Procedures Take one specimen, and with the printed surface facing up, lay it flat on a flat glass (E.1.2).

When sampling, be careful to ensure that the surface of the sample under test does not come into contact with other objects. Use a dyne pen (E.1.1) to quickly draw a 100 mm long straight line on the specimen. Use a stopwatch (E.1.3) to start timing from the moment the line is drawn.

After 2 seconds, immediately observe the changes in the drawn line. If the line is clear and complete (the width of the line is the same as the width of the dyne pen) and the ink is evenly distributed, then, it shall be determined that the wetting tension of the specimen is greater than or equal to 38.0 mN/m; otherwise, it shall be determined that the wetting tension of the specimen is less than 38.0 mN/m. E.4 Expression of Results For each sample, test 2 specimens. When the determination results of both specimens are greater than or equal to 38.0 mN/m, then, it shall be determined that the wetting tension of the sample is greater than or equal to 38.0 mN/m.

Appendix F Appendix F

(normative) Determination of Non-degradable Components F.1 Principle Each coating component has distinct chemical compositions and structures, exhibiting corresponding characteristic peaks in its infrared absorption spectrum. Upon pyrolysis under high-temperature conditions, it produces corresponding characteristic pyrolysis products. The presence of the target component in the sample is determined by utilizing the characteristic peaks in the infrared absorption spectrum and the characteristic pyrolysis products produced by pyrolysis under high-temperature conditions, followed by chromatographic separation and mass spectrum identification. F.2 Reagents F.2.1 Water, GB/T 6682, Grade III.

F.2.2 Anhydrous ethanol, analytically pure.

F.3 Instruments, Equipment and Tools F.3.1 Fourier transform infrared spectrometer, equipped with attenuated total reflectance accessory.

F.3.2 Pyrolysis / gas chromatograph-mass spectrometer, equipped with electron impact source. F.3.3 Beaker. F.3.4 Scissors. F.4 Test Procedures F.4.1 Fourier transform infrared spectroscopy test F.4.1.1 Specimen handling Select clean coated paper and board for food packaging and place it in a beaker containing anhydrous ethanol, ensuring that the specimen is completely immersed in the ethanol. After 10 minutes, remove the specimen, gently peel off the film, remove any paper fibers from the film and air-dry it. Fold the film and heat-press it into a thin sheet, obtaining a sample with a thickness of no less than 10 m and an area of no less than 16 mm2 (or dimensions of no less than 4 mm  4 mm), and set it aside. For samples whose film is difficult to peel off, the immersion time may be appropriately extended. If peeling is impossible even after prolonged immersion, direct testing may be performed using pyrolysis / gas chromatography-mass ......