Unit_6_-_Paper_and_Paperboard (5)

Unit_6_-_Paper_and_Paperboard (5) - their neighbors so much...

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Paper is very much an anisotropic material, and this is important in packaging applications. For example, paper is stiffer (more resistant to bending) in the MD than in the CD. If we try to bend paper in the MD, the fibers themselves have to bend (like bending a toothpick or straw). If we bend it in the CD, the fibers only need to change their position with respect to
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Unformatted text preview: their neighbors, so much less force is required; the bending is easier because it occurs between adjacent fibers that are parallel with one another. (It may help in visualizing this to think of the arrows in the diagrams as representing the paper fibers.) 6. 14...
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