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Using of biodegradable cellulose fibers in the packaging products production reduces needs in synthetic materials for these purposes. Softwood kraft fibers are widely used for cardboard and paper products production because of their high characteristic strength and good paper-forming properties. Recycling of fibers decreases their strength. It happens partly due to the removal of xylan, which plays an important role in interfiber bonds formation in a paper sheet. A priority task is to increase the number of cycles...