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

摘要

CRIMPED FIBRES OF SOLVENT-SPUN CELLULOSE ARE MADE AND CHECKED FOR DAMAGE IN A METHOD 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 (14) TO FORM A TOW (15) OF CONTINUOUS FILAMENTS,III) THE TOW IS PASSED THROUGH A WATER BATH (18) TO LEACH OUT THE AMINE OXIDE, IV) THE TOW IS CRIMPED BY PASSING THROUGH A STUFFER BOX (23) IN WHICH IT IS COMPRESSED TO APPLY CRIMP,V) DRY STEAM BEING INJECTED INTO THE STUFFER BOX (23)MDURING THE CRIMPING PROCESS, ANDVI) THE CRIMPED TOW (25) LEAVING THE STUFFER BOX (23) IS PASSED THROUGH DETECTION MEANS (26) IN WHICH VII) A BEAM IS PROJECTED ACROSS THE PATH OF TRAVEL OF THE TOW AND IS RECEIVED BY RECEIVING MEANS (35) ON THE OPPOSITE SIDE OF THE TOW, THE RECEIVING MEANS BEING CALIBRATED TO INITIATE A SIGNAL IF OBSCUREMENT OF THE BEAM BY THE TOW (25) VARIES BEYOND A PREDETERMINED AMOUNT.AN APPARATUS IS ALSO PROVIDED TO DETECT FOR DANAGE OF THE CRIMPED FIBRES.(FIG. 1)