The Ring Crush Test
The ring crush test is similar to the strip crush test in that the strength of liner or fluting is measured in the machine and cross directions.
The results in this test are highly dependent on proper specimen preparation. The specimen, as well as the test fixture must be parallel in order to insure an exact determination with the ring crush strength.
ISO 12192 and TAPPI T 822 are Standards for this type of test.
Since the ring crush test provides more information about the buckling behavior rather than about crush behavior, it is being replaced by the strip crush test.
The advantages:
- Light, precision guided compression plates prevent lateral yielding of the specimen during the test
- Suitable compression plates for miniature flute board in Zwick´s standard program
- Automatic recognition of breaking on all flutes prevents misinterpretation in the flat crush test
- Inserts for the ring crush test fit into the compression plates without a problem. Lateral yielding of the specimen is also prevented
- A data graph of the test run is standard with all tests
