GB895141A - Improvements relating to the heating of viscose - Google Patents

Abstract

Viscose is heated by passing an alternating current through a moving stream thereof. Suitable apparatus comprises two electrodes spaced from each other along the length of and projecting into a viscose supply line and connected across an alternating current source of variable output. In Fig. 1, viscose flowing through pipe 2 is heated by current passed across the perforated electrodes 4, 5 which are connected to the variable output of the transformer 6. In another form of apparatus, the viscose supply line has two right <PICT:0895141/IV (a)/1> <PICT:0895141/IV (a)/2> <PICT:0895141/IV (a)/3> angled bends separated by a straight length of line with the electrodes forming the wall of the supply line at the outside of each bend. Thus, in Fig. 2, viscose flowing through pipe line 7 is heated by current passed across the electrode pairs 8, 9 and 10, 11, which are connected to a transformer as shown, 8 and 11, being earthed to prevent leakage of current into the remainder of the system. In Fig. 3, viscose flows from inlet 13 into the annular chamber 12, thence via parts 15 into the inner chamber 14 and finally through the perforated plate 19 to the outlet 16. The walls of the chambers 12 and 14 are of insulating material, and the viscose in both chambers is heated by current passed across the electrodes 17, 18 connected to the transformer. As the viscose in the inner chamber 14 is hotter than that in the annular chamber 12 and hence of greater conductivity, the cross-sectional area of 12 is made greater than that of 14 to obtain the same current density in both chambers.