Aluminium cap nozzle flexure break-off force

Case study
Aluminium gas cylinder cap break off test start and completion
Aluminium gas cylinder cap break off test start and completion
Aluminium gas cylinder cap break off test samples fixtures and systems
Aluminium gas cylinder cap break off test samples fixtures and systems

Solution

  • Motor-drive force tester and gauge for display
  • Quick engagement clamp
  • Custom-designed fastening jig and chisel point probe

Benefits

  • Simple, consistent and efficient testing
  • Custom solution for unique product design

Requirement

A major global supplier of medical gas devices and components required quality control tests to assess part of a new product. One of their components, a 5 ml pressurised aluminium cylinder filled with helium gas, is incorporated into a needle-free powder intradermal analgesic injection system for children.

To ensure consistent quality and good manufacturing practices, the supplier needed to test the break-off force of the aluminium cylinder cap at its stem. The company used to perform the test manually, but required a motorised system, which could perform the test at a consistent speed to gain better result accuracy.

Solution

Mecmesin provided a MultiTest motorised test system with an Advanced Force Gauge (AFG), a chisel point accessory, to break-off the cap, and special fixturing to securely hold the sample in place. It was vital that the sample would always break at the same point, therefore, a special cantilever-operated sample holder was manufactured. This enables each cap to be loaded and precisely positioned using the same amount of pressure each time, which minimises variability.

A specially designed non-adjustable base plate also ensures the sample and fixturing remain static for consistency during and between measurements. Tests are performed at a constant speed of 50 mm/min, with the force displayed and recorded by the AFG.

Test equipment

  • MultiTest 1-i motorised tester
  • AFG Digital Force Gauge
  • Custom-designed holding fixture
  • Chisel Point Probe
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Mecmesin/PPT Group, UK