Product category:
Materials Testing
News Release from: Lloyd Instruments | Subject: Test jig for contact lens blister pack
Edited by the Manufacturingtalk Editorial
Team on 17 November 2006
New test jig for contact lens blister
pack testing
Lloyd Instruments has developed a special jig for easy determination of peel strength of the aluminium foil on contact lens blister packs.
Lloyd Instruments has developed a special jig for easy determination of peel strength of the aluminium foil on contact lens blister packs Designed for use primarily with the low force LFPlus single column materials testing machine, the jig features a self-adjusting sliding bed for true 90andnumber730; peel tests
This article was originally published on Manufacturingtalk on 7 Oct 2002 at 8.00am (UK)
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The jig has been engineered for use with two contact lens blister packs, each containing individual lenses in a solution.
One lens pack is clamped in the upper instrument grip, whilst the other is clamped and fitted into a special mount in the jig's sliding baseplate.
As the test machine's crosshead is driven upwards, peeling the foil on the lower blister pack, the baseplate slides horizontally, to ensure that the peel force is always applied vertically.
Peel strength is an important parameter to be measured for contact lens packages.
Too high a strength and the blister package is difficult to open and there is the risk of a sudden opening resulting in the lens and fluid being accidentally ejected.
If the peel strength is too low, there is a chance that the foil lid could be detached accidentally, for instance when carried in a bag or pocket, with loss of fluid and damage to the lens.
With material testing and force measurements up to 1 kN (225 lbf), test speeds from 0.05 to 1270 mm/min and accuracy greater than 0.2% the LFPlus materials tester is ideally suited to peel test applications of this type.
Tests can be fully automated through the addition of the new Nexygenplus materials testing software.
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