Cuprammonium rayon from coconut trunk dissolving pulp [Philippines]
1984
Francia, P.C. | Eleazar, A.C. | Serrano, A.C. (Forest Products Research and Development Inst., College, Laguna (Philippines))
Cuprammonium dissolving pulp was produced from coconut trunk chips by the prehydrolysis-kraft process and purified by multi-stage bleaching sequence. The unbleached kraft pulp obtained had a relatively low pulp yield and the pulp purification by the 3-stage C-E-H and 5-stage C-E-H-E-H bleaching sequence produced to cuprammonium grade dissolving pulp with physical and chemical properties within standard specification. Cuprammonium rayon was spun using a pneumatic wet-spinning machine. The rayon spun from a higher concentration of cellulose and alpha cellulose content and purified with a 3-stage bleaching sequence of CEH, was comparable to standard commercial grade rayon. The physical and chemical properties of the rayon had a tensile strength range from 4.05-4.3 g per t1295ex, stretch rupture of 5.2-6.4% shrinkage in length of 1.10% yarn number, 130 gms/tex. The yarn considered to be a dyeable fiber readily stained with the dye stuff used. The microscopic longitudinal view appeared cylindrical in shape without striation, while the cross sectional view was quite smooth and round. The cupra rayon was readily soluble in acids but insoluble to alk
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