Which term describes the direction of fibers in paper?

Which term describes the direction of fibers in paper?

• A. Grain Direction
• B. Opacity
• C. Basis Weight
• D. Color Separation

Answer: (A)

Grain direction describes how the fibers are aligned in a sheet of paper. During making, the cellulose fibers mostly line up along the machine direction, so the grain runs with the length of the sheet. This orientation matters because it affects how the paper behaves when folded, scored, or torn, and how it expands or contracts with changes in humidity. Folding along the grain gives cleaner folds and less cracking, and you’ll plan layouts and bindings with grain direction in mind to maintain stability. Other terms describe different properties: opacity is how much light the paper blocks, basis weight is the weight per unit area, and color separation is a printing step that splits an image into color components.

Grain direction describes how the fibers are aligned in a sheet of paper. During making, the cellulose fibers mostly line up along the machine direction, so the grain runs with the length of the sheet. This orientation matters because it affects how the paper behaves when folded, scored, or torn, and how it expands or contracts with changes in humidity. Folding along the grain gives cleaner folds and less cracking, and you’ll plan layouts and bindings with grain direction in mind to maintain stability.

Other terms describe different properties: opacity is how much light the paper blocks, basis weight is the weight per unit area, and color separation is a printing step that splits an image into color components.