[post_page_title]Plastic bottle caps[/post_page_title]
That soft little disc underneath the lid of a plastic bottle, what purpose does it serve? Because if you pull it out, the bottle will close just as well without it. There are two purposes for this little disc.
The first is to make the seal is more complete, so even in the event of the bottle being turned upside down, the liquid doesn’t leak out. The other is to keep carbonated sodas carbonated for longer.
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