pps proceeding - Abstract Preview
pps proceeding
Symposium: S07 - Fibers and Films
Oral Presentation
 
 

A twist-gel spinning process for effective removal of solvents

Wyatt Tom P. (1), Yao Donggang (1)*, Deng Yulin (1)

(1) Georgia Instiute of Technology - GA - USA

A new method for solvent removal in fiber gel spinning was investigated. Instead of solvent evaporation or coagulation as conventionally used, the new method involves mechanically twisting the gel fiber along the fiber axis. By removing the majority of solvent in the gel fiber through mechanical twisting, the emission of solvent vapor and the production of waste solvent mixture or coagulation byproducts are minimized. The new method was demonstrated through gel spinning of high-strength ultrahigh molecular weight polyethylene fibers using both volatile and nonvolatile solvents. The results showed that over 90% solvent was removed by a single-step twisting process and the resulting fiber retained the high mechanical properties conventionally obtained. A mechanistic model was developed for estimating solvent removal as a function of twisting. Applying to the gel spinning industry, the new method holds a promise of simplifying the solvent removal and recovery steps and improving the production rate, leading to more efficient and more effective gel spinning processes.