Testing systems for foodstuffs and packaging - Zwick - #19

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19 Function tests on packagings Packaging is manifold and also its function and type of opening. Individual values must be determined since normally no Standards exist. Examples of such testing: • Penetration of a straw in a composite carton for drinks • Penetration of pre-perforated openings • Opening forces of ring-pull cans • Tearing off an opening flap, e.g. from lids • Pulling out of carrying handles • Opening and closing tests of snap closures • Operating forces of pump bottles Pure materials testing Basic materials such as plastic, paper and metals have the most varied material tests performed on them mainly according to Standards. Some examples: • Tensile test on plastic foils for the determination of the stress-strain-characteristic • Determination of the coefficient of friction (COF) • Penetration test on elastic packaging materials for the determination of the penetration resistance • 4-Point flexure test for tests on single and multi-layer corrugated board For more detailed information about pure materials testing please request our industry brochures for the respective basic materials, plastics, metals, paper or textiles. Sealed-seam strength The determination of the sealed-seam strength of sealings made of flexible packaging material is carried out according to DIN 55529 and other Standards. The test is a tensile test on a 15 mm wide strip with a pull-off angle of 180°. The sealing must have a certain strength according to the use of the packaging material.