ISO 9895 short-span compressive strength / short-span compression test (SCT)
ISO 9895 specifies a method for determining the compressive strength of paper and cardboard with short grip-to-grip separation (short-span compression test (SCT)) and is recommended for a range with a mass up to 400 g/m2 per unit area. It is intended for paper and cardboard used for the manufacture of packaging and cartons and helps to ensure that the packaging can withstand loads during transport and storage.
The standard TAPPI T826, which is used primarily in the North American paper industry, and the standard DIN 54518 also describe the procedure for determining the short-span compressive strength of paper and cardboard.
Because only a short length of paper (0.7 mm) is used in the test, the load-bearing fiber content of the material is taken into account to a greater extent with the SCT than with the traditional test method, the ring crush test (RCT) to ISO 12192.
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Video: Performing an SCT on paper to ISO 9895
The SCT to ISO 9895, TAPPI T826 and DIN 54518 uses a narrow paper strip clamped in the ZwickRoell SCT test device with a very short grip-to-grip separation of 0.7 mm (short span) compressed perpendicular to the plane of the paper. The aim is to determine the maximum compression force per area unit (short-span compressive strength) that the paper can absorb for a short time before it fails.
ZwickRoell SCT test device to ISO 9895, DIN 54518 and TAPPI T826
The ZwickRoell SCT test device is used to determine the short-span compressive strength in the sheet plane of paper and cardboard (100 to 400 g/m²) to ISO 9895, TAPPI T826 and DIN 54518.
- The test device consists of two pneumatic clamping units, connected by two precision guides. The closing force is applies pneumatically. Solid construction with precision guides guarantees excellent reproducibility of test results, even with heavy paper grades.
- The line of action of force of the guide element in the specimen and the symmetry line of the load cell are in one plane. They permit end loading without lateral forces and bending moments. delivering premium quality results for the SCT value.
- A very stiff test arrangement minimizes the influence of the machine on the specimen.
- The SCT test device can be used as a cost-effective accessory with our universal testing machines from the zwickiLine, ProLine and AllroundLine series. In combination with our burst tester to ISO 2758/ISO 2759, the SCT test device is a very cost-effective and functional testing solution compared to expensive single solutions, especially for testing corrugated base paper.
- The ZwickRoell testing software with its test programs and prepared data interface for CAQ systems guarantees fast data integration.
- Optimal specimen parallelism is achieved with the ZwickRoell strip-cutter.
