Aluminum caps can be divided into two types: high gloss surface bottle caps and silk surface bottle caps. The former is processed by technology, and the surface of the bottle cap is as bright as a mirror. In addition, surface hot stamping technology and the combination of silk screen and transfer printing significantly improve the overall effect and anti-counterfeiting level of the product. The latter is produced through the use of technology and craftsmanship, with a luxurious velvet texture on the surface, and due to the highly clean interior of the equipment.
There are two main factors that affect the quality of aluminum caps: first, the material of the aluminum cap and the wall thickness of the cap body; The second is the impact of the radial fit tolerance and axial (height direction) fit tolerance of the aluminum cap and bottle mouth on the sealing quality. The influence of the quality of aluminum material in the aluminum cover on the sealing quality: The aluminum cover for oral liquid is made of industrial pure aluminum or rust proof aluminum that meets the requirements, and other grades of aluminum may also be used. In general, industrial pure aluminum has high plasticity, low hardness, and high elongation. The aluminum caps produced from this type of aluminum material are easy to roll during sealing, so the locking mouth of the seal is flat and smooth, not easy to wrinkle, and has good adhesion on the bottle mouth. At the same time, the hardness HV value of aluminum caps is standardized by various production plants, and neither too low nor too high can meet the requirements of good sealing.