Ripening

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(1) A process in the production of cellulose ethanoate (acetate) consisting in the splitting off of some of the ethanoic acid (acetic acid) and most of the combined catalyst present in the primary cellulose ethanoate (acetate).

(2) A process in the manufacture of viscose in which, prior to spinning, the number of xanthate groups is reduced and some redistribution takes place. The process is time and temperature dependent.

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