The alginate fiber bundles prepared by wet spinning techniques were processed through soaking in different solvents for 30 min and then dried at 60 ℃ for 3 h.The changes of the alginate fiber in different solvents were observed through an optical microscope and the alginate fiber bundles were observed through an scanning electron microscope.The changes of the surface of alginate fiber processed though different solvents and the dispersion of dried alginate fiber bundles were analyzed.The association phenomenon of hydrogen bonds in the alginate fiber and the alginate powder were analyzed through the Fourier infrared spectrum.On the basic of observation

the analysis of the Fourier infrared spectrum and the theory of moisture sorption

combining with an analysis of the difference and connection between different solvents

an interfacial theory model of producing doubling fibers in alginate fiber bundles during the drying process was discussed.Then a reasonable explanation of the experimental phenomena was given by applying this interfacial theory model.In the end

the experiment of destroying the hydrogen bonds by heating

the experiment of closing the hydroxyl and the freeze-dried experiment were used to verify the correctness of the interfacial theory model

but also can be used to solve the problem of producing doubling fiber

then expanding its scope of application.