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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