Machine-direction grammage variation measurement
(gravimetric method), TAPPI/ANSI Test Method T 546 om-22
This procedure can be used to determine the short term machine-direction variation in mass per unit area. These variations can be caused by defects in the stock approach system, headbox, or consistency control. This test method is not intended to identify the source of the variations, but rather to quantify them. The method has particular application to acceptance testing of both the papermaking process and the product.