MANUFACTURE OF SOLVENT-SPUN CELLULOSE FIBRE AND QUALITY CONTROL DETECTION MEANS THEREFOR

摘要

Detection means are provided in a method of making continuous filaments of solvent-spun cellulose to detect "trash" or other undesired material on the filaments. Accordingly, there is provided a method of making a tow of continuous filaments of solvent-spun cellulose in which: i) cellulose is dissolved in an amine oxide solvent to form a hot cellulose solution, ii) the hot cellulose solution is extruded through a die assembly to form a tow of continuous filaments, and iii) the tow is passed through a water bath to leach out the amine oxide, wherein the improvement comprises: iv) passing the tow of continuous filaments through detection means, v) the detection means comprising a beam projected across the tow and having receiving means on the opposite side of the tow, the receiving means being calibrated to initiate a signal if obscurement of the beam by the tow varies beyond a predetermined amount. An apparatus including the detection means is also provided.