Custom bottle cap mandrels

Customised engineering example

Plastic caps applied to bottles may be thin-walled and flexible, so that they become distorted when gripped by an operator during torque testing. This significantly affects the torque readings obtained, throwing their credibility into doubt.

By using the knurled profile of the cap as leverage, the best way to torque-test is by providing a mechanical grip which matches the cap at as many points as possible around the circumference.

Many well-known manufacturers come to us for custom-profiled mandrels to use on their torque testers. A custom mandrel is much quicker to place and release than a screw-fit clamp, and by precise positioning offers true repeatability in the testing of bridge torque, removal torque and incremental torque.