GRAIN DIRECTION IN PAPER

PAPER GRAIN SHOULD BE PARALLEL WITH THE BINDING EDGE.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Paper, like wood, has a grain. If a book is printed with the paper grain parallel to the spine it will open more easily and lay flat. Adhesive binding on paper with the wrong grain direction can produce disastrous results. Here are some simple tests to determine paper grain direction:

  • FOLDING TEST: When folding a small sheet of paper you will notice that it folds more easily and smoothly when the fold is parallel to the grain. If folded against the grain, the small fiber particles break and make an unsatisfactory fold.

  • MOISTURE TEST: If moisture is applied to one side of a sheet of paper, it immediately starts to curl in one direction. The expansion is on the cross-grain edge, the curl indicating the paper grain direction.

  • BENDING TEST: Thicker papers are best tested by bending them in both directions. One direction offers considerably more resistance than the other. Parallel to the grain direction the resistance is far less than against the grain.

  • TEARING TEST: A sheet is torn in longitudinal and transverse directions. The tear pattern will be straight when parallel to the grain and jagged across the grain.

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