INVESTIGATION UPON THE SPINNING OF VISCOSE: (I) MODEL INVESTIGATION OF VISCOSE FLOW

Investigations were made to find the relation between the flow of viscose and the shape of nozzle. Using different kinds of nozzles both in length and shape, we measured the flow properties of viscose under pressure, and correction factors C of the modified Bernoulli's equation, was calculated. To show the shape and length of nozzle numerically, the following terms are defined Equivalent length=(A2-A1) (Shape factor) (Nomenclature is given in Fig.2) The correlation between the characteristics of plotts in C versus the flow speed and the shape of nozzles was found, C is given in a general formula, C=mu+b where m=A(shape factor)+B log(b)=α(Equivalent length)+β The microscopic observation was made of the point where viscose left the nozzle into the coagulation liquid, and it moves into the nozzle hole as the nozzle draft is increased. Using the general formula on C, the easiness of the point to move into the nozzle was calculated and the results show that the larger the vertical angle of cone formed of nozzle hole the more difficult for thepoint to move into nozzle hole.