Q.1089: How to grade a paper?

Ans. Paper can be graded based on their end use, process of manufacturing, raw material used etc. Papers can be graded in 'n' numbers of ways and if we count all permutation and combination of grades total grades may well exceed 10,000. Some of the major grades classifications are;

1. Based on basis weight

Tissue: Low weight, <40 g/m²

Paper: Medium weight, 40 - 120 g/m²

Paperboard: Medium High weight, 120-200 g/m²

Board: High weight, >200 g/m²

2. Based on Color

Brown: Unbleached

White: Bleached

Colored: Bleached and dyed or pigmented

3. Based on Usage

Industrial: Packaging, wrapping, filtering, electrical etc.

Cultural: Writing, printing, Newspaper, currency etc.

Food: Food wrapping, candy wrapping Coffee filter, tea bag etc.

4. Based on Raw Material

Wood: Contain fibers from wood

Agricultural residue: Fibers from straw, grass or other annual plants

Recycled: Recycle or secondary Fiber

5. Based on Surface Treatment

Coated: Coated with clay or other mineral.

Uncoated: No coating

Laminated: aluminum, poly etc

6. Finish

Fine/Course

calendered/ supercalendered

Machine Finished (MF)/Machine Glazed (MG)

Glazed/Glossed

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