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The scope below describes the Proposal for a New Standard with development in progress.

New standard for measuring hardness of the wound roll.

Method: Deceleration measurement with constant collision energy

Roll hardness measurement has been traditionally carried out in industries where products are formed into rolls. Roll hardness measurement is employed to gauge the roll uniformity. Baggy edges, gage bands, telescoping, staring, for example, are all issues that can be detected with proper roll hardness measurement systems. The variation in the hardness across the roll relates directly to converting issues.

The plunger is accelerated very precisely and repeatedly towards the roll surface with a known velocity. As soon as the plunger comes in contact with the surface of the roll, it begins to "decelerate". Once the velocity reaches 0, the results are calculated and reported in g-force or 1g = 9.81m/s. The rate of deceleration has a direct relationship to surface hardness.

If you would like to join the Working Group that is working on this new proposal, please write to standards@tappi.org

TAPPI Standards guidelines require that all TAPPI members receive notification of any proposed new Standard or TIPs. This message is being sent to you because you are a TAPPI member; have purchased TIPs or Standards products from TAPPI; or because you have previously expressed interest in this topic.

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