喷丝板规格及纺丝速度对Lyocell纤维力学性能和结构的影响

Effects of spinnerets’ specification and spinning speed on mechanical properties and structure of Lyocell fibers

为提高Lyocell纤维的力学性能,采用不同孔径和长径比的喷丝板制备Lyocell纤维,研究喷丝板规格和纺丝速度与Lyocell纤维的力学性能和结构之间的关系。结果表明,随着喷丝板的孔径增大,Lyocell纤维的结晶度和取向度增大,初始模量和断裂强度相应提高,但喷丝板的孔径过大会导致Lyocell纤维的结晶度和取向度减小,初始模量和断裂强度相应下降;随着喷丝板的长径比和纺丝速度的提高,Lyocell纤维的结晶度和取向度提高增大,初始模量和断裂强度相应提高。

In order to enhance the mechanical properties of Lyocell fiber,the spinnerets with different pore sizes and different length to diameter ratios were used to spin Lyocell fiber,and the effects of spinneret's specification and spinning speed on the mechanical properties and structure of Lyocell fiber were studied.It was found that with increasing pore size of spinneret,the crystallinity and orientation of Lyocell fiber increased and the initial modulus and breaking tensile strength inproved accordingly,but too big pore size of spinneret resulted in the decreased crystallinity and orientation of Lyocell fiber and the decreased initial modulus and breaking tensile strength.With increasing length to diameter ratio of spinneret and spinning speed,the crystallinity and orientation of Lyocell fiber rised,and the initial modulus and breaking tensile strength increased accordingly.