Why does the mineral water bottle cap have no gasket and does not leak? Why don't some bottles use this design? The heavy gasket is not strong enough.

It's not a patent restriction, it's a question of technical level.

At present, there is still a certain gap between domestic and foreign molds for producing beverage caps. There are many domestic manufacturers of beverage lid molds, but most of the molds used by high-end beverage lid enterprises are imported.

In addition to the mold level, there are also the design technology of bottle caps and the level of bottle cap manufacturing equipment.