8021 flexible packaging aluminum foil currently has several problems yet to be solved.
● The uniformity of the surface state of 8021 flexible packaging aluminum foil is too costly to require a good surface, the production cost will increase dramatically, and so far there is no good solution.
● 8021 aluminum foil as an extreme thickness product, which uses up almost all of its plasticity. The reprocessability of aluminum foil for flexible packaging is not high, despite the use of new alloys and processes, (e.g. 8011, 8079). Plasticity is still no good way to substantially improve. The flexible packaging composite bag processing methods to consider this aspect is less, so that there are often burst phenomenon.
8021 aluminum foil chemical composition
| Alloy No. | Si | Fe | Cu | Mn | Mg | Zn | Others | Al | ||
| 8021 | ≦0.15 | 1.2≦ | ≦0.05 | ≦0.05 | ≦0.05 | ≦0.05 | ≦0.05 | REMAIN | ||
Mechanical Properties of 8021 alloy aluminium foil
| Tensile strength
σb (MPa) |
Elongation
δ10 (%) |
Cupping test value (mm) | Note |
| 90-110 | 13-18 | 6.2-7.3 | Erichsen Test |
● Measurement of the plasticity of 8021 aluminum foil indicators are not scientific, can not truly express the plasticity of aluminum foil. The performance of flexible packaging aluminum foil is still in the trial stage. Without scientific indicators to measure, production inspection cannot be carried out.
Scientific selection of thickness, reasonable laminating process, matching materials are as important as the performance of aluminum foil itself. Reasonable matching can not only make the product quality stable but also reduce the cost.
