■J'RI'.ATMIiNT FOR lliXriLE INSULATION 



233 



the lliin coaling desired and llierefore tiie quantity of acetone used 

 would be high. This made it economical to recover the acetone after 

 it had been driven off from the coated wire. 



It was quickly established that the procedure should include several 

 passes of the wire through the cellulose acetate solution with the excess 



CAPSTAN! 



ELECTRIC 

 HEATING UNITS 



WIPERS 

 IMMERSION PULLEY 



CONTAINER FOR 

 CELLULOSE ACETATE 

 SOLUTION 



Fig. 2 — An exiuTinifiiial nuuhinc tnr tuMting textile insulated wire with cellulose 

 acetate. The immersion pulley with wiper dies are shown raised for threading. 



solution removed and the coating dried after each pass. The source 

 of drying heat was optional and for experimental purposes electrical 

 heating elements were used. The temperature of drying was limited 

 by the tendency of the coating to blister. A rapid circulation of air 

 quickened the rate of drying and with a sufficiently long drying cham- 

 ber, a high rate of wire travel seemed possible. 



