Class A paper is what we usually call square paper. The size of the whole paper is 889 *1194 mm.
Specifically, A 1 size (large folio, 597*840mm), A2 size (large quartile, 420*597mm), A3 size (large quartile, 297*420mm) and A4 size (large quartile, 2/kloc-0 * 20 mm) can be cut.
Grade B paper is what we usually call plain paper. The size of the whole paper is 787 * 1092 mm ... specifically, it can be cut into B 1 size (face to face, 520*740mm), B2 size (face to face, 370*520mm), B3 size (face to face, 260*370mm) and B4 size (face to face, 370mm).
Classification of mechanical papermaking
1. Printing paper: securities paper, book paper, magazine paper, rough paper, newsprint, mould paper, offset paper, shadow printing paper, cotton paper, bible paper, coated paper, imitation coated paper, colored paper, etc.
2. Packaging paper: kraft paper, sulfanilamide paper, match paper, medium rice paper, rust-proof paper, fruit paper, cigarette paper, sulfuric acid paper, imitation sulfuric acid paper, glycine paper, cellophane, miscellaneous paper, etc.
3. drawing paper: watercolor paper, Kent paper, drawing paper, charcoal paper, customs paper, etc.
4. Electrical insulating paper: there are wrapped paper, thin insulating paper and thick insulating paper.
5. blotting paper: blotting paper, carbon paper, spacer paper, napkin, toilet paper, etc.
6. paperboard: there are yellow paperboard, tea paperboard, ground paperboard, whiteboard, kraft paper, core paperboard and building paperboard.
7. Decorative paper: cover paper, colored paper, patterned paper, wallpaper, sliding door paper, leather filling paper, metal foil art paper, etc.
8. Post-it notes: including bookkeeping paper, notebook paper, miscellaneous notes paper, carbon paper, tracing paper, etc.
9. Filter paper: chemical analysis filter paper, insulating oil paper, etc.
10. Special processing paper: carbon paper, copy base paper, inkstone base paper, photosensitive base paper, celluloid base paper, fiber base paper, etc.