Why hook-and-loop fasteners stick without glue
A hook-and-loop fastener joins two surfaces by catching tiny hooks in a field of small loops. Pressing the strips together engages many catches at once; peeling them apart releases catches along a moving edge. This mechanical connection can be reopened and closed without applying fresh adhesive.
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Hundreds of small catches
One side of a hook-and-loop fastener carries tiny hooks. The other has a surface of loops. Pressing them together allows many hooks to catch loops, creating a connection spread over the contact area.
Pulling along the joined surfaces asks many catches to resist together. Peeling starts at an edge and releases a smaller group at a time, which often makes opening easier.
The fastening action is mechanical. Glue may attach each strip to a shoe or bag, but it is not what repeatedly joins the two exposed fastening faces.
- Pressing engages the hooks and loops.
- Peeling progressively disengages them.
- Lint can occupy hooks and reduce effective contact.
The familiar ripping sound comes from many small releases occurring rapidly as the separating edge moves across the strip.