GCM 110 Chapter Notes - Chapter 10: Toner, Free Newspaper, Laser Printing

• School: Ryerson University
• Department: Graphic Communications
• Course: GCM 110
• Professor: Diana Brown

Document Summary

Grain: refers to the position of the fibers (important for printing and binding) During papermaking, most fibers are oriented with their length parallel of the paper machine (machine direction) and their width running across the machine (cross direction) Paper folds smoothly with the grain direction and cracks when folding cross-grain, is stiffer in the grain direction, expands/contracts more in cross direction when exposed to changes in moisture. Basis weight: the weight in pounds of a ream (500 sheets) in the basic size for that grade of paper. Or, it is the weight of 1 m2 of paper and is expressed in g/m2. Ex: basis 70 means that 500 sheets 25x38 inches of book paper weigh 70 pounds = 104 g/m2. Paper is commonly identified by ream weight: 20-pound bond, 70-pound coated, etc. Metric system: in the u. s, basis weight is referred to as grammage, and is expressed as weight per unit area, or grams per square meter (g/m2)