In the melt spinning of polyoxymethylene (POM), spin-line was heated by irradiating the carbon dioxide laser at a position immediately below the spinneret. Reduction of spin-line tension as well as the shift of solidification point to downstream was found to occur by the laser irradiation heating. In addition, birefringence and crystal orientation of as-spun fibers decreased with increasing laser intensity. In other words, structure development of POM was suppressed by the laser irradiation. Drawing was applied to as-spun fibers to improve the mechanical properties. In case of as-pun fibers prepared without the laser irradiation heating, tensile strength of maximally drawn fibers decreased with an increase in the take-up velocity of as-spun fibers. In case of the drawing of laser-irradiated as-spun fibers, reasonably high tensile strength was attained even when the as-spun fibers with high take-up velocity was used as the starting material. This result means that the productivity of high strength POM fibers can be improved through the application of laser irradiation heating.
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