PURPOSE: To remove the clogging material from a sintered metallic filter, to achieve the moderate cooling of the spun filaments in spinning process, and to prevent the mutual welding of the filaments, by immersing a sintered metallic filter in an alkaline solution, neutralizing with an acid solution, and cleaning with steam.
CONSTITUTION: In the melt-spinning of polyester fiber, a sintered metallic filter is used to straighten the flow of gas for cooling the filaments extruded from the spinneret. The filter is immersed in an alkaline solution (preferably 0.05W0.5N caustic soda solution) usually at room temperature W80°C for 0.5W5hr. The filter is then immersed in a solution of an acid such as sulfuric acid, hydrochloric acid, etc. (preferably 0.05W0.5N concentration) preferably for 1W60sec to neutralize the attached alkali. The treated filter is washed with water and cleaned with steam.
SENBA SHIGERU
MURAKISHI HIDEO
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