TAPPI T 409
2015 Edition, January 1, 2015
Machine direction of paper and paperboard
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Description / Abstract:
This Standard Practice describes several procedures for
determining the machine direction of most grades of paper and
paperboard. Most of the procedures embody the principle that fibers
tend to be aligned in the machine direction of the sheet, and this
alignment produces observable effects. However, the extent of
restraint used in drying can be very important in determining