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Button Pull-Off Test

Specification


The customer was a supplier to major UK clothing retailer Marks & Spencer, who stipulate that all fasteners and attachments must be tested to failure. The strength of the joint/button was critical to ensure that it met design tolerance and safety levels, particularly in baby clothing. A motorised unit with a test speed was defined at 200mm/min as the system needed to be simple to use in a production environment and provide consistent results.

Solution


The cloth material was clamped in a 'Double Action Vice Grip' with 50mm wide faces coated with non-slip rubber to enhance gripping strength. The button fixture was supplied with interchangeable plates having slots of 3.5 or 7 mm wide to suit the various sizes. Since it is normal for the button to shatter during the test, a perspex guard was incorporated in the fixture to protect the operator. For ease of loading the button into the fixture, and to help maintain a straight-pull, the 'Button Pull Fixture" was connected to the force gauge via a flexible chain link. The peak tension load to remove/break the button was then recorded at the fast data-acquisition speed of 1200 Hz.

System


  • 1000N UltraTest Motorised Test Stand (superseded by the MultiTest 1-dV)
  • 500N AFG
  • Double-action Vice Grip
  • Button Pull Fixture

Supplied to

S.R. Gent, Dewhirst Childrenswear, Coats Viyella

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A Brand You Can Trust

"The MultiTest 0.5-i is a very good and reliable machine and the Emperor™ Software brings great advantages. It’s a very useful tool for these kinds of tests. It’s fully programmable and offers an in-depth analysis of results. It’s a precious tool for everybody involved, especially those who work with plastics and their mechanical performance"

Nikos Michopoulos, Quality Control, Eurofilm Mantzaris S.A.

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