A child-resistant closure (CRC) has to keep children out while staying easy for adults to open. Behind this ordinary-looking cap, three parts work together.
Here is a DIN 20 push & turn closure, shown exploded.
Three parts, one mechanism
- the black outer cap, with gripping ribs and opening pictograms moulded on top;
- the inner insert, in translucent natural plastic, carrying the DIN 20 thread and the drive teeth;
- the liner, a foam disc with film, sealing against the bottle neck.
At rest, the outer cap spins freely around the insert and the bottle stays closed. To open it, you push and turn at the same time: the teeth engage the insert and the closure unscrews. Young children cannot coordinate that double movement.
Other CRC mechanisms
- push & turn, the most common, like this closure;
- squeeze & turn;
- alignment of marks on cap and bottle.
ISO 8317 in short
ISO 8317 covers reclosable child-resistant packaging. It relies on real tests with a panel of young children and a panel of adults. Certification applies to the closure and bottle together, not to the closure alone. These tests can be organised as part of your project, with a specialised laboratory, on your bottle.
Your child-resistant closure
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