Influence of Laval nozzles on the air flow field in melt blowing apparatus

2012 ◽  
Vol 80 ◽  
pp. 342-348 ◽  
Author(s):  
Dawud H. Tan ◽  
Peter K. Herman ◽  
Arun Janakiraman ◽  
Frank S. Bates ◽  
Satish Kumar ◽  
...  
Keyword(s):  
Flow Field ◽  
Air Flow ◽  
Melt Blowing ◽  
Laval Nozzles

scholarly journals Optimal design for the dual slot die in melt blowing process

2014 ◽  
Vol 18 (5) ◽  
pp. 1714-1715
Author(s):  
Li-Li Wu ◽  
Ting-Ting Cheng ◽  
Chuan Xu ◽  
Ting Chen
Keyword(s):  
Experimental Design ◽  
Optimal Design ◽  
Flow Field ◽  
Design Method ◽  
Air Flow ◽  
Variance Analysis ◽  
Orthogonal Experimental Design ◽  
Melt Blowing ◽  
Experimental Design Method ◽  
Slot Die

The parameters of the dual slot die in an industrial melt blowing equipment are designed optimally using the orthogonal experimental design method. The air flow fields of different die parameters are simulated. Effects of the die parameters are analyzed using variance analysis. The results show that the inset distance and slot width have significant effects on the air flow field while effect of the slot angle is unremarkable.

Air Flow Field and Fiber Motion in a Swirl Die Melt-Blowing Process

2013 ◽  
Vol 690-693 ◽  
pp. 2861-2865
Author(s):  
Sheng Xie ◽  
Yuan Sheng Zheng ◽  
Yong Chun Zeng
Keyword(s):  
Flow Field ◽  
High Speed ◽  
Air Flow ◽  
High Speed Camera ◽  
Important Process ◽  
Melt Blowing ◽  
Spiral Motion ◽  
Fiber Motion ◽  
Fiber Path ◽  
The Relationship

Melt blowing is an important process for producing nanofibrous nonwovens. Compared to another technology for producing nanofibrous nonwovens, electrospinning, melt blowing applies high-speed air flow field to attenuate the extruded polymer jet. In this study, the air flow field of a swirl die melt-blowing process was simulated by CFD software, Fluent 6.3. The swirling air profile was shown. Meanwhile, a high-speed camera was used to capture the fiber path below a single-orifice melt-blowing swirl die. The spiral motion of the fiber was revealed. The relationship between the fiber path and the air flow field was discussed. This paper shows the relationship between the fiber path and the air flow field in a swirl die melt-blowing process.

Fiber spinning with airfields enhanced by airfoil louvers

2018 ◽  
Vol 89 (15) ◽  
pp. 3150-3158
Author(s):  
Kayla A Foley ◽  
Robert L Shambaugh
Keyword(s):  
Flow Field ◽  
Air Flow ◽  
Research Work ◽  
Fiber Spinning ◽  
Polymer Fiber ◽  
Air Flow Rate ◽  
Air Velocity ◽  
Melt Blowing ◽  
Slot Die ◽  
Spinning Process

Airfields are used in common polymer fiber spinning processes, such as melt blowing and spunbonding. A pair of louvers was installed in the air flow field of a melt blowing slot die. Previous research work has shown that, with louvers in place, the air velocity along the fiber threadline is higher than the velocity when louvers are not used. Since the air velocity is what drives the spinning process, the presence of louvers was expected to increase the attenuation of the molten filaments and thus improve the melt blowing process. Melt blowing runs were made with variable louver size (chord), louver separation, louver distance from the die face, the angle of the louvers relative to the die face, and air flow rate. Fibers were collected and fiber diameters were measured.

Retarding the decay of temperature in the air flow field during the melt blowing process using a thermal insulation tube

2019 ◽  
Vol 90 (5-6) ◽  
pp. 606-616
Author(s):  
Xibo Hao ◽  
Ying Yang ◽  
Yongchun Zeng
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Kinetic Energy ◽  
Flow Field ◽  
Thermal Insulation ◽  
Field Experiments ◽  
Air Flow ◽  
Rapid Decrease ◽  
Turbulence Kinetic Energy ◽  
Melt Blowing

During melt blowing, most of the polymer jet attenuation occurs in the area within 2 cm from the die, due to the rapid decrease of polymer jet temperature. Therefore, keeping the polymer jet temperature above melting point for a longer time is beneficial for its attenuation. Here, a thermal insulation tube with heating ability was introduced into the air flow field during the melt blowing process. The computational fluid dynamics technique was employed to investigate the effects of the thermal insulation tube on the air flow field. It was found that the thermal insulation tube has enhancing effects on the temperature, velocity, and turbulence kinetic energy of the air flow field. Experiments were conducted to examine the fiber diameters of the final nonwovens, the results of which indicates that a die with a thermal insulation tube can achieve a higher polymer jet attenuation and that the heating effect can further enhance the attenuation. Based on the computational fluid dynamics technique, the effects of the tube diameter and length on the temperature, velocity, and turbulence kinetic energy of the air flow field were investigated.

scholarly journals Fabrication of nanofiber non-wovens on the melt blowing die with air by-passes

2016 ◽  
Vol 20 (3) ◽  
pp. 1006-1007
Author(s):  
Ting Chen ◽  
Kang Yang ◽  
Li-Li Wu
Keyword(s):  
Flow Field ◽  
Energy Saving ◽  
Air Flow ◽  
Melt Blowing

The air flow field of the melt blowing die with air by-passes is simulated. The results show that fibers fabricated on the die with air by-passes are much finer than those without air by-passes, which indicates an energy-saving approach to fabricating nanofibers on the melt blowing equipment.

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