Testing Of Paper And Paperboard : Tear Resistance-Elmendorf

To determine tear resistance (Elmendorf ), a sample is torn with the help of a pendulum device starting from a predetermined cut. The work required for a tear of a given length is measured. The test is described in ISO 1974 (1990).

Z-directional strength refers to the ability of paper or board to resist tensile load¬ing in a direction perpendicular to the plane of the paper (z-direction). After ex¬ceeding the z-directional strength of the paper, a break in the paper structure occurs in the sheet but not at its surface.

 The z-directional strength is therefore not equivalent to the surface strength or linting tendency of the paper. Many test meth¬ods to measure z-directional strength of paper are available. Some methods have also been standardized, TAPPI UM 584, TAPPI UM 403, TAPPI UM 527, and TAPPI UM 528.

The z-directional strength (DIN 54 516, 2004) is determined by measuring the maximum force per unit sample width required to split the sample.

Tags: , , , , , ,

Advertise
paper questions
paper questions

Donate

Please donate with PayPal if you find this site helpful



Paper Production

Buy Papermaking Books from amazon.com

Donate

Please donate with PayPal if you find this site helpful

paper questions