How do you test the hardness of paper?

The impact plunger of the instrument is pressed against the paper roll which compresses a spring. After reaching a certain point, the spring is released and an internal hammer mass is launched against the impact plunger. The amount of hammer mass rebound depends on the hardness of the test piece.

What is the hardness of paper?

Hardness

How does the Smith roll tightness tester work?

The Smith Roll Tightness Tester is a hand-held device which measures the force required to penetrate a needle between the wraps of a wound roll to a maximum depth of 7mm. A series of measurements are taken between the center core and outer edge of the roll structure.

What is a paper roll hardness test?

Paper Roll Hardness Tester (Recording) It provides fast, accurate, non-destructive hardness profiles of rolls to assure smooth and efficient printing. Rolls that are too hard, or too soft, rolls that are unevenly wound, or rolls with different moisture contents can cause difficulties during the printing process.

What is the Schmidt roll hardness tester used for?

The Schmidt Roll Hardness Tester is often used in conjunction with the Smith Roll Tightness Tester (TMI 40-54-00) to provide a complete profile of roll properties. For additional information on how Testing Machines Inc. can help your company profit through testing, please call us at 1-800-678-3221, or e-mail [email protected] .

What is a hardness tester used for?

A hardness tester performs a measurement by determining the resistance of a material to penetration or to deformation at a given force. For testing paper rolls the measurement is generally a non-destructive deflection.