For export containers, there are strict regulations in place to ensure quality and compliance. Here's a detailed overview of the requirements:
1. **Surface Quality**: The outer surface of the packaging box must be free from any damage, stains, rust, peeling, cracking, or other paper defects. The internal paper should also not have issues like splicing, missing material, wrinkles, penetration, or color inconsistencies. All boxes in the same batch must agree on whiteness and paper quality. Preprinted and UV-coated layers may have minor cracks, but no drossing is allowed.
2. **Printing Standards**: The printing patterns and text on the box must be clear, accurate, and consistent in depth. They should be positioned precisely, with an allowable overlap error of up to 1mm. The ink should not flake off, and there must be no typos, wrong prints, missing prints, or reprints. Excess ink leakage should not exceed five instances per 1mm x 1mm area on the front of the box. On the sides, no more than five 2mm x 2mm areas with excess ink are allowed. The barcode must be clearly readable.
3. **Folding Lines**: The indentation lines on the box should not exceed 12mm in width. The folding line should be centered, with no unnecessary lines such as cracks, broken lines, or heavy lines that could affect the visual appearance or structural integrity.
4. **Box Shape and Alignment**: The box must maintain a square shape without any warping or overlapping. After assembly, the misalignment between the two flap covers should not exceed 5mm. The hole angle after forming should not be larger than 5mm in diameter, and the nail width should match the tongue width, ranging from 35mm to 50mm.
5. **Box Nails**: The nails used should be low-carbon steel flat wires with a coating, free from rust, peeling, or cracking. They should be placed along the centerline of the lap joints, neatly arranged, and not skewed by more than 2mm. The spacing should be even, with the distance from the end to the edge of the fold being 137mm. The nail joints must be fully secured, with no extra nails or holes. No nails should appear within printed text.
6. **Adhesive Quality**: The adhesive used should be cornstarch-based, applied evenly and completely without spilling. The adhesion must be neat and firm, with the two joint parts properly aligned. Any displacement between the upper and lower sections, or left and right, should not exceed 2mm. There should be no issues like the box sticking to itself.
7. **Flap Durability**: After the box is assembled, the flap should be folded back 180 degrees and then folded again 180 times. It should not crack during this process. Any paper crevices inside the box must not be visible. For manually printed UV boxes, the flap folding method remains the same. For automatic film boxes, the maximum number of folds is 90 in three attempts. The UV layer can have slight cracks but no drossing, while paper can have slight cracks but no dew (moisture) issues. Corrugated boxes with A, B, or C flutes must not have dew defects.
8. **Pressure Test**: During pressure testing, the box should not curl, collapse, or bulge for 2 minutes.
9. **Handle Holes**: If the box has handle holes, they must be centrally aligned. Each hole should be 5mm–7mm wide and 18mm–20mm high, with a distance of 102mm–104mm between the two. The holes must not interfere with any printed patterns or fonts.
10. **Ventilation Holes**: The ventilation holes should be 15mm in diameter and must not intersect with any printed text or graphics.
These standards ensure that all export packaging meets international quality and safety requirements. For more information, visit: [China Package Box Trading Website](https://www.chinapackaging.com).
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