When the bottle cap is not welded

1.Before welding, plastic bottle caps have many shortcomings that cannot be ignored. Firstly, the sealing performance is poor. During transportation or storage, the bottle caps are prone to loosen due to shaking and squeezing, resulting in liquid leakage and volatilization. This not only causes waste of the contents but also may contaminate other items. Secondly, the assembly is not firm enough. Relying solely on snap - on or threaded connections, after frequent opening and closing, the snaps are likely to wear and break, and the threads will gradually strip, affecting the service life of the bottle cap. Thirdly, in terms of appearance, it is not aesthetically pleasing. There are obvious gaps at the joints of various components, which not only affects the overall texture of the product but also leaves consumers with a bad impression of rough workmanship.

After adopting ultrasonic welding

2. However, the plastic bottle caps after ultrasonic welding have significant advantages. Firstly, after welding, a seamless integrated structure is formed, and the sealing performance is greatly improved. It can effectively block external air and moisture. Whether in high - temperature or low - temperature environments, or during severe bumps, it can ensure that the items in the bottle are not affected by external factors, extend the shelf life, and guarantee quality and safety. Even after being opened and closed many times, there will be no problems such as loosening and falling off, which greatly enhances the durability of the bottle cap. Finally, in terms of appearance, ultrasonic welding makes the surface of the bottle cap flat and smooth, without splicing gaps, and the overall lines are smooth, significantly improving the product grade. Whether it is for personal use or for sale as a commodity, it can leave a good impression of being delicate and reliable.