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Cellulose is a homogeneous polycrystalline macromolecular compound, which is a two-phase system connected by crystalline region with a regular arrangement of cellulose molecules and less structurally ordered amorphous region. The degree of crystalline completeness and the ratio of these two phases varies with the type of fibre and the location of the fibre. Crystallinity is a key parameter in describing the structural order of cellulose and represents the percentage of the crystalline zone to the total volume of the fibre in the cellulose.