|Vintage Mullen Burst Tester|
It is sometimes said that the bursting strength is very closely related to machine direction tensile strength. The basis for this statement lies in the distribution of stresses within the specimen during the test. Prior to rupture, the rigidly clamped specimen stretches due to the stress applied by the expanded diaphragm. The strain is approximately equal in all directions. But, since the paper will not withstand stretch equally in all directions, unequal stresses build up and eventually produce rupture. In most cases, the line of rupture will be perpendicular to the machine direction because the paper stretches least in that direction. At other times, there is no principal rupture line. Consequently, the burst test can be used to determine the machine direction of a specimen whenever a principal line of rupture occurs during the test.
Bursting strength is of importance as a paper mill control test for linerboards for shipping containers. Conformity of the finished shipping containers with the test specifications required by Uniform Freight Classification Rule 41 is dependent on the bursting strength of the finished corrugated paperboard, which is controlled by the bursting strength of the linerboard.
|Modern PROFILE/Plus Burst|
ISO 2758 Paper. Determination of bursting strength
ISO 2759 Board. Determination of bursting strength
TAPPI T403 Bursting Strength of Paper
TAPPI T807 Bursting Strength of Paperboard and Linerboard
TAPPI T810 Bursting Strength of Corrugated and Solid Fiberboard