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This test method covers four procedures for determining the machine direction of most grades of paper and paperboard.
Formerly under the jurisdiction of Committee D06 on Paper and Paper Products, this test method was withdrawn in February 2010 because an equivalent TAPPI publication exists.
1.1 This test method covers four procedures for determining the machine direction of most grades of paper and paperboard, embodying the principle that machine direction alignment of fibers results in:
1.1.1 Cross-direction shrinkage to produce curl with axis in machine direction,
1.1.2 Higher cross-direction tear,
1.1.3 Higher tensile strength in machine direction, and
1.1.4 Higher stiffness in machine direction.
1.2 Application of the procedures in this method to certain grades of paper, such as sheets laminated to film, creped papers, extensible papers (where it is not unusual for the machine direction tensile to be relatively low and the stretch to be relatively high) and papers reinforced with textile materials, may result in unreliable determinations.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D585 Practice for Sampling and Accepting a Single Lot of Paper, Paperboard, Fiberboard, and Related Product
D774/D774M Test Method for Bursting Strength of Paper
D828 Test Method for Tensile Properties of Paper and Paperboard Using Constant-Rate-of-Elongation Apparatus
D1968 Terminology Relating to Paper and Paper Products
TAPPI StandardT409 Machine direction of paper