Why does Velcro stick? Seems magic to me.


Why does Velcro stick? Seems magic to me.

In: 8

A bunch of tiny plastic hooks are grabbing a surface yarn. They’re weak enough to bend when pulls and release the fabricy yarn stuff.

Velco is a “mechanical” adhesive, meaning it’s not chemistry or weird physics or anything, it’s just plain old things grabbing each other and holding tightly.

Specifically, you take a super thin plastic wire. On one side of the velcro the wire is connected back onto itself in an arch, like the letter n. On the other side of the velcro the wire is bent and cut, into a little letter j. When you combine the two the “hook” of the j gets stuck in the arch of the n and holds onto it. That’s it. When you pull the velcro apart you’re just pull thousands of little j hooks out of thousands of tiny n s.

I would like to point out that Velcro is a brand name. The product is a [Hook-and-loop fastener](https://en.m.wikipedia.org/wiki/Hook-and-loop_fastener)

What everyone else said, the ol hook and loop! Great example of biomimicry-when we invent something based on nature, in this case the burr. https://www.sciencefriday.com/articles/biomimicry-in-action/