The Strip Crush Test
The paper’s characteristic „compressive strength" can be determined by the strip crush test with high accuracy. Because of the short test length of only 0.7 mm, the load bearing fibre portion of the material is taken into consideration more than with the traditional testing methods (ring crush test, corrugated crush test or linear crush test). The Zwick test arrangement has unique characteristics compared to the normal horizontal machines:
- Zwick uses a load cell with a high capacity. This makes the measuring chain very stiff and keeps post-test effects from the machine to the specimen reduced to a minimum.
- Specimen and load cell lie in the same symmetrical axis. Erroneous bending moments are nonexistent.
Since resolution and accuracy of the Zwick measurement electronics is extremely high, paper can be accurately measured from ca. 100 g/m² up to 400 g/m² and higher. Because of its technological advantages, the Strip Crush Test is being more accepted worldwide.
The advantages:
- An inexpensive accessory to be used with a Zwick machine
- Has the necessary stiffness for compression tests because of the load cell with high capacity
- Very little retroactive affect on the specimen due to the symmetrical design
- Easy-to-use user interface for quick control of the test run
The Strip Crush Test is according to ISO 9895 or TAPPI T 826.
