What changes occur to raw materials during the paper making process?

Answer 1

Papermaking is a series of physical and chemical changes. The physical and chemical changes will depends on raw material used and grade of paper manufactured. For a typical north American paper mill which uses wood for making copying paper, following changes will take place. Operation Type of Change Logging Physical Barking (Removal of bark) Physical Chipping Physical Screening Physical Cooking Chemical Washing Physical Chemical Recovery Chemical Bleaching Chemical Washing Physical Refining Physical Sizing Chemical & Physical Screening Physical Cleaning Physical Wet-end chemical addition Chemical & Physical Sheet Formation Physical Pressing Physical Drying Physical Calendaring Physical Winding Physical Rewinding Physical Cutting Physical

Answer 2

During the paper making process, raw materials such as wood pulp or recycled paper undergo various changes. These include breaking down the fibers, removing impurities through a cleaning process, mixing with water to form a slurry, and pressing and drying the slurry to form thin sheets of paper. The end result is a cohesive material that can be used for writing, printing, or packaging.