Simulation Of Intercalated Melt Jet Flow Field And Optimization Of Production Process Parameters

Meltblown nonwovens have thin fiber diameters,excellent filtration performance,small pores and large specific surface area.However,the bulkiness of the material is not good enough.Conventional fibers are added to the meltblown material to increase the thickness and bulkiness of the material,and improve the sound absorption and insulation performance of the material.This paper first uses FLUENT software to simulate the melt-jet flow field and the intercalated melt-jet flow field under different process parameters.The changes in the velocity and position of the air flow at the outlet of the interlayer have little effect on the speed and temperature of the melt-jet.However,it affects the degree of deflection of the molten jet.The change in the pressure of the melt jet affects the velocity of the airflow field and does not affect the temperature greatly,but it affects the change of the fiber diameter.Experiments were performed on meltblown and intercalated meltblown,and samples were produced for analysis according to different process parameters.The results show that with the same meltblown process parameters,pure meltblown fibers have a smaller diameter than meltblown fibers in intercalated meltblown materials.The melt-blown nonwoven material has a higher filtering effect than the intercalated melt-blown,but the thermal insulation and sound absorption effects are lower than the intercalated melt-blown nonwoven.With the increase of the interstitial airflow speed,the material’s filtering,thermal insulation and sound absorption performance become larger;as the melt jet velocity increases,the fibers become thinner,the number of pores inside the material structure increases,and the insulation,sound absorption and filtering performance become better;Changing the position of the air outlet of the intercalation will affect the position where the intercalation fibers enter the melt jet and combine with the meltblown fibers,affect the state of fiber mixing in the intercalation meltblown material,and the sound absorption and thermal insulation and filtering performance of the material.The same mass per unit area,different meltblown and polyester fiber proportions,as the proportion of hollow polyester fibers increases,the thickness increases,the insulation and sound absorption properties increase,and the filtration performance decreases.