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Internal structure of foam formed cellulose materials with high recycled fibers content. (a) Foam formed materials from 100% bleached cellulose fibers; (b) foam formed materials from 100% recycled cellulose fibers; (c) foam formed materials from 50% bleached cellulose fibers+50% recycled cellulose fibers; (d) water formed materials from 100% recycled fibers.
