Mingtai realizes its quality control of aluminium sheet for bottle cap in the following ways.
A: Strictly control various performance parameters of raw materials, including strength, elongation and dimensional deviation requirements.
B: During the rolling process, the surface quality should be checked at least once every 3 coils, and the surface quality should be checked for each coil of the finished product pass.
C: The finished product must pass strict cap stamping test.
The following products were judged as unqualified:
1. The surface is not smooth;
2. There are cracks, bubbles or through pores on the surface;
3. There are metal and non-metal press-in on the surface;
4. There are light and dark stripes on the surface;
5. The slices have burrs, knife back prints or ruffles;
6. Cracks or creases appear in the stamping test.
