Скачать или смотреть Japan's Self-Closing Jam Jar Explained!

The self-closing lid operates through the simple force of gravity, enhanced by thoughtful engineering. Aohata’s innovative design allows the lid to twist shut on its own when placed on the jar, thanks to the angle of the ridges around the jar's opening. These ridges are angled at 10 degrees, much steeper than the typical 6 degrees found on standard jars, creating a more effective gravitational pull. This steeper incline overcomes friction, similar to how an object on a steep slope slides downward, making the lid glide smoothly.

(However, the user still needs to tighten the lid if they want a proper seal.)

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