End float test of inhaler cap

  • Mecmesin


‘End float’ is the diplacement in mm of a product, in this case the cap of the inhaler, measured at a specific load.
The customer wished to apply a 3N load in both tension and compression to the cap of a new design of inhaler. Any resultant displacement from the nominal position then had to be measured.


The sample was laid horizontally into a slide-mounted nest and clamped into position. The cap of the bottle was rested in a location fixture connected to a 5N S-beam loadcell.

The nest was incremented forward using micrometer adjustment until a minimal compressive load was achieved, displacement at this load was zeroed.

The nest was then moved forward until a 3N alarm point was reached and the displacement of the load was noted (compressive end float). For the calculation of the tensile end float, the process was reversed.

The system was supplied with mechanical limit stops to prevent accidental overload of the small capacity loadcell. The use of both tension and compression visual and audible alarms provided a clear indication of when the test load had been achieved.


  • AFTI
  • S-Beam Junior Loadcell 5N
  • Slide Mounted Rest
  • Location Fixture
  • Micrometer Adjustment Barrel
  • Base Plate

Supplied to

GlaxoSmithKline, UK

See also

Cosmetic packaging pull-off test

A bench-top testing system was required to repeatably test the pull-off force on a variety of cosmetic containers. The system needed to allow a relatively high volume of containers to be tested with the minimum level of training required for users. Mecmesin's solution avoided the risk of damaging the loadcell by excessive torque on tightening the collet grip, and the lipstick barrel was first inserted in the grip and then connected to the gauge by a flexible chain-link.

Food packaging made from thermoformed plastics and intended for freezing, requires testing to ensure optimum functionality when closing and sealing the container. The closing effort of the lid is measured by using a motorised force tester controlled by software together with a custom-designed fixture to hold standard-sized ice cream tubs. In addition the ‘top-load’ crush strength of the container itself can also be tested on the same machine to guarantee it is rigid enough to avoid buckling and spillage when the lid is applied.

Mecmesin develops Combi Cork-i Extraction Tester for leading Scottish whisky

To improve the quality and storage of a premium product, the R&D team at a leading Scottish whisky maker needed to optimise the design of their bottle stoppers. They decided that the strength and performance of their reusable stoppers could be ensured by systematic testing of the characteristics of both portions of the stoppers. Working closely with the R&D team, Mecmesin developed the Combi Cork-i Extraction Tester, an innovative multi-function cork extraction testing system that tests both phases of de-corking synchronously.

Greek beauty product manufacturer guarantees production quality by updating to Mecmesin's digital torque testers

A manufacturer of a wide range of skin, hair-care, make-up and sun-care products based in Greece needed to replace their outdated torque testers with up-to-date digital torque testers to guarantee production quality and to ensure their products remained sealed. Mecmesin supplied the company with two Tornado 10N.m digital torque testers, which have the ability to test tamper-evident closures, an intrinsic part of their specification.

  • Jeff West
  • Product Info
  • English
  • Created 12 Oct 2016
  • Modified 13 Oct 2016
  • Hits 839