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Viscose-rayon pulps from Chilean hardwoods coigue, tepa, and ulmo

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  • A study was made of the possibility of producing pulp of viscose rayon grade from three Chilean hardwoods, coigue, tepa, and ulmo. Unbleached pulps were made from the three woods by (1) the neutral sulfite semichemical process with and without steam prehydrolysis, (2) a water prehydrolysis-sulfate process, and (3) the sulfite process. These pulps were purified by means of the conventional sequence of chlorination, alkaline extraction, oxidation, and acidic extraction. Yields of purified pulps, which contained from 2 to 7.5 percent of pentosans, ranged from 38 to 45 percent of the woods. Results of filtrability tests of viscose solutions from two of the pulps, of spinning trials on four of the pulps, and the general similarity of all of the pulps in chemical composition indicated that pulps acceptable for continuous-thread viscose rayon can be produced from the three woods by any of the processes investigated.
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