The paper fibers are comparable to a carpet of rice grains parallel online. If you do the test, you will see that is easier to fold the paper in one direction than another. So just like grains of rice, it is easier to fold the carpet along with the grain than trying to cut the rice grains in two because they break.
The two easiest ways to check the grain are:
1. Fold the sheet in one direction and another. You'll find that in a sense the paper in filth and the other not.
2. Tear the sheet in one direction, then another. The grain is always where the tear is nearly straight as it follows the grain. You will see that in the opposite direction of the grain, the tear is crooked because the grains are broken.
So before we print the final documents, it is important to evaluate the finish this project application. For example, if you want a brochure 3 fold 2 folds accordion, think of taxation according to the paper fibers ordered that one can bend in the''common sense''of the grain and get a nice document ! Otherwise, you will see cracks where the folds of your documents and this does not give a very nice finish. In exceptional cases, a varnish or lamination can still help strengthen the grains.
Here is a Wikipedia article which gives details of the paper.
http://fr.wikipedia.org/wiki/Papier
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