Q.1091: Is papermaking a physical or chemical change?
Ans. 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 |
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