| Compact-Sirospun with lattice apron is one kind of new textile technology based on the technique of conventional ring spinning, pneumatically condense is used in this system to get fiber bundle into yarn. This technology catches lots of career men’s attention for its significantly enhance yarn properties. Currently, researches on spinning mechanism of Compact-Sirospun technology and Compact-Sirospun yarn structure as well as the relationship between spinning process and yarn quality were not thoroughly enough for its short developing history, which caused a great limited to optimizing compact system and improving compact technology. Therefore, system of Compact-Sir spun with lattice apron was ergarded as the subject investigated in this paper,influences of airflow on fiber movement was studied as the subject of researches, and on this basis, a series of works had been done.After precision measurement on each condense component of Compact-Sirospun with lattice apron firstly, the computational fluid dynamic model was established and was computerized with parallel technologies&standard κ-ε turbulent model by computational fluid dynamics software FLUENT for simulating and characterizing the flow field in condense zone. Flowing state of airflow was characterized in condense zone, also distribution rules of static pressure and velocity and their effect on fiber bundle in inlet curved surface of suction slot were analyzed. Previous studies showed that airflow velocity is influenced by different arrangement of Suction double slot. airflow characteristics under different arrangement of Suction double slot were simulated by the methods mentioned above. The results showed that the converging airflow was generated by negative pressure effects in this system; the regional Y axis velocity distribution (Vy, which is vertical to the surface of irregular pipe) and Z axis velocity distribution (Vz, which is parallel to the surface of irregular pipe and perpendicular to the direction of the fiber inputting) are extracted from the simulation result. The analysis conclusion of air flow is that outside the edges of the air suction slot the fixing affection of air flow is so weak that can not counteract the condensing affection of air flow, but inside the edges the fixing affection is so strong that the fibers can reach relative balance. Combining the air flow feature and air suction slots arrangement, the conclusion is that the V-shaped air suction slots can make the both bundles condense more effective, which makes the fibers more compact ant straighter than the parallel system. The inclined-parallel air suction slots can make one more compact but make the other much wore, which has no improvement to the yam quality even worse as a whole.Finally, according to the thought used in the theoretical research, experiment scheme was designed and yarns listed in the scheme were produced, then physical and mechanical properties of yarn such as hairiness, Ulster properties, breaking force and so on had been tested and compared, also the microscope was used to observed yarns’ longitudinal structure. The experiment results verified the validity of the theoretical research in this paper to some extent.Based on law study on airflow filed in condense zone, a series of researches on Compact-Siro spun with lattice apron have been done and quantity of experiments have been done to verify the simulation results. Research in this paper made compact spinning theory tending to be more perfect, also it could provide a effective guideline for improving Compact-Siro spun process in future study. |
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