Metal bottle cap on glass pull-off test

Customised engineering example

Gripping the base of a glass bottle for a tensile test can be challenging due to the slippy surface and contoured shape.

Our client needed to pull a foil screw cap and tamper-evident sleeve from bottles of various sizes, without slipping at forces exceeding 1 kN. Machine chucks were used to hold the cap, but the bottle required a custom design fixture. Mecmesin designed adjustable V-jaws with rubber-edged finger grips that could interleave for smaller bottles yet be wide enough for larger ones. This provided the required friction to grip the glass bottle securely under tension and to align it axially for the cap to be pulled off.

The speedy 'clamp and release' mechanism made it easy for operators to use and reduced overall testing time.