The sealing performance of the bottle cap is one of the measures of the matching between the bottle cap and the bottle body. The sealing performance of the bottle cap directly affects the quality and storage time of the beverage.

Especially for carbonated drinks, since the drink itself contains carbon dioxide, when it is shaken and collided, the carbon dioxide escapes from the drink and the air pressure in the bottle increases. If the sealing performance of the bottle cap is poor, quality problems such as beverage overflow and bottle cap detachment will easily occur.

For the quality control of bottle caps, it is required to be easy to open and avoid leakage problems caused by poor sealing performance. Therefore, torque is another major quality control point for bottle caps. Excessive torque not only wastes production energy, but also affects the convenience of packaging opening, which is not conducive to user experience. If the torque is too small, the bottle cap will not be tightly sealed, causing the bottle cap to trip, reducing the sealing performance of the packaging, and even causing the contents to leak. Therefore, the bottle cap torque should be controlled within a certain reasonable range.

Plastic bottle caps have a complex structure and have the function of preventing backflow. They have various surface treatment methods, strong three-dimensional effect, and unique and novel appearance. However, their inherent defects cannot be ignored.

Since the glass bottle uses a thermoforming process, the size error of the bottle mouth is large, making it difficult to achieve high sealing performance. Some packaging experts point out that due to the presence of strong static electricity, plastic bottle caps easily absorb dust in the air, and the debris generated during ultrasonic welding is difficult to remove. There is currently no complete solution to the problem of plastic debris contaminating wine.

In comparison, aluminum anti-theft bottle caps can overcome the above-mentioned shortcomings of plastic bottle caps. Aluminum anti-theft caps have a simple structure, strong adaptability, and good sealing effect. Compared with plastic bottle caps, aluminum bottle caps not only have superior performance, but can also be mechanized and mass-produced. They are also low-cost, pollution-free, and recyclable.

If special and advanced printing methods are used, not only can colorful patterns be printed, but the anti-counterfeiting effect is also very good. Of course, aluminum bottle caps also have certain defects, such as different colors on the sides of the bottle caps, easy paint peeling, and lack of changes in appearance. However, technical solutions to these problems can be found.