Testing System Assesses Paper On-Press Performance

In the development of offset printing paper, the force and deformation performance during printing testing is pivotal for clean print.

In the development of offset printing paper, the force and deformation performance during printing testing is pivotal for clean print.

And according to Zwick, missing raster points and blurry print are undesired.

The compressibility test, in which the paper is loaded up to the nominal load, provides insight in to the performance of paper during offset printing, added the company.

Compressive force and deformation are measured during the test.

A high-resolution path measurement is necessary as the deformation is on the scale of 10microns.

The Zwick Roell system comes from hardness testing, where deformations on the same scale are measured - a compression platen with floating bearing and loaded by a ball swivel presses on the paper.

The deformation between the paper and in front of the load cell is measured with a resolution of 20nm.

The path measurement system is integrated in to the hardness measurement head.

A quick-change penetrator, the automatic and fast reconfiguration to different specimen heights and the automatic test sequence and the evaluation guarantee convenient testing within a short period of time, claimed Zwick.

The tests are evaluated automatically using the Testxpert test software with the results, including the statistical data, also presented automatically in a clearly laid out log.

The test log can be adapted to customer requirements.

In addition, it is possible to transfer the data to external databases.

The Zwick hardness testing system with hardness measurement head can be used in testing machines as well as in automatic testing systems.

A productive application - for example pass and fail tests - is also possible.

The indentation or depth measurement system corresponds to accuracy class 0.2 in accordance with DIN EN ISO 9513.

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