The Effects of Recycling on the Chemical Properties of Pulps
نویسندگان
چکیده
Changes in the physical properties of pulp during recycling are sometimes reported to be caused by changes in chemical properties offibres. In order to determine the relationship, if any, between physical and chemical properties, a chemical characterization was carried out of several recycled pulps. Measurements of carbohydrates, lignin, crystallinity index, and DP of cellulose were carried out as well as FTIR spectra. The results showed no direct relationship between the removal of hemicelluloses or lignin and the loss or gain of strength properties during recycling. Slight cellulose depolymerization occurred during recycling of kraf pulps. Howevel; it was largely inhibited in the presence of deinking chemicals. Also, there were no increases in cellulose crystallinity index afer recycling.
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