scholarly journals Turbulent air flow field in slot-die melt blowing for manufacturing microfibrous nonwoven materials

2018 ◽  
Vol 53 (9) ◽  
pp. 6991-7003 ◽  
Author(s):  
Sheng Xie ◽  
Wanli Han ◽  
Guojun Jiang ◽  
Chao Chen
Keyword(s):  
Flow Field ◽  
Air Flow ◽  
Melt Blowing ◽  
Nonwoven Materials ◽  
Slot Die ◽  
Turbulent Air Flow

Experimental Investigation into a New Melt-Blowing Die for Dual Rectangular Jets

2014 ◽  
Vol 945-949 ◽  
pp. 270-273 ◽  
Author(s):  
Yu Dong Wang ◽  
Xin Hou Wang
Keyword(s):  
Experimental Investigation ◽  
Flow Field ◽  
Air Flow ◽  
Hot Wire ◽  
Melt Blowing ◽  
Important Impact ◽  
Slot Die ◽  
Online Measurements ◽  
Turbulent Air Flow

In this work, online measurements of turbulent air flow field in the melt-blowing process for the slot die with inner stabilizing pieces and the corresponding blunt die were carried out with a hot-wire anemometer. The experiment results reveal that the inner stabilizing piece has an important impact on the flow field below the die face. The new modified die is aerodynamically superior, should contribute to produce much finer melt-blowing fibers and require less energy than the corresponding blunt die.

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.

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.

scholarly journals Computation and measurement of air temperature distribution of an industrial melt blowing die

2014 ◽  
Vol 18 (5) ◽  
pp. 1705-1706
Author(s):  
Li-Li Wu ◽  
Dong-Hui Huang ◽  
Chuan Xu ◽  
Ting Chen
Keyword(s):  
Temperature Distribution ◽  
Flow Field ◽  
Temperature Measurement ◽  
Air Temperature ◽  
Measurement System ◽  
Air Flow ◽  
Melt Blowing ◽  
Air Temperatures ◽  
Slot Die ◽  
Temperature Measurement System

The air flow field of the dual slot die on an HDF-6D melt blowing non-woven equipment is computed numerically. A temperature measurement system is built to measure air temperatures. The computation results tally with the measured results proving the correctness of the computation. The results have great valuable significance in the actual melt blowing production.

Effects of the die Parameters on the Air Flow Field from a Dual Slot Melt Blowing Die

2011 ◽  
Vol 332-334 ◽  
pp. 1347-1351
Author(s):  
Xu Chuan ◽  
Li Li Wu
Keyword(s):  
Flow Field ◽  
Field Model ◽  
Air Flow ◽  
Jet Flow ◽  
Melt Blowing ◽  
Mean Velocity ◽  
Air Jet ◽  
Slot Die ◽  
The Mean

In this paper, the air jet flow field model for the dual slot die is established. The flow field from the blunt die was found to exhibit that as the jet angle becomes sharper, width of the die slot and distance between the inside edges of both jets more narrow, the mean velocity under the die increases.

Experimental and numerical analysis of an improved melt-blowing slot-die

e-Polymers ◽  
2019 ◽  
Vol 19 (1) ◽  
pp. 612-621 ◽  
Author(s):  
Yudong Wang ◽  
Changchun Ji ◽  
Jianping Zhou
Keyword(s):  
Flow Field ◽  
Air Flow ◽  
Measurement Data ◽  
Central Area ◽  
Melt Blowing ◽  
Maximum Value ◽  
Die Surface ◽  
Slot Die ◽  
Two Dimensional Flow ◽  
The Common

AbstractIn order to reduce the melt-blowing fiber diameter, an improved slot die with internal stabilizers was designed. The air-flow field of the improved die was measured by a hot wire anemometer. Furthermore, utilizing computational fluid dynamics software, the air flow field from the improved slot die was studied and the work was validated with the laboratory measurement data. The experimental results and numerical simulation data indicate below the die surface, the internal stabilizers play an important role in the velocity distribution of the flow field. Firstly, the improved slot die can increase the velocity and the temperature near the centerline of the flow field and reduce the maximum value of turbulent kinetic energy, compared to the common die. Secondly, the end face of the slot hole has a certain influence on the surrounding flow field and the central area exhibits two-dimensional flow field distribution.

Optimum Design for the Dual Slot Die Parameters of Melt Blowing Process

2013 ◽  
Vol 796 ◽  
pp. 272-276
Author(s):  
Ting Ting Cheng ◽  
Chuan Xu ◽  
Li Li Wu ◽  
Ting Chen
Keyword(s):  
Flow Field ◽  
Air Flow ◽  
Slot Width ◽  
Design Parameters ◽  
Orthogonal Experimental Design ◽  
Computer Assisted ◽  
Range Analysis ◽  
Melt Blowing ◽  
Air Jet ◽  
Slot Die

Melt blowing process can produce superfine fibers. In this process, the polymer is drawn by the high velocity hot air jets from the dual slot die. The die parameters have great effects on the fiber diameter. In this paper, the die parameters of the dual slot die in an industrial melt blowing equipment are studied using the orthogonal experimental design method. Three parameters namely the inset distance, slot width and slot angle are considered. Each parameter has three levels. Nine sizes of dual slot dies with different design parameters are numerically simulated using the established air flow field model of melt blowing process. Distributions of air velocity and air temperature of nine air jet flow fields are obtained. Effects of the three parameters are studied with range analysis and 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. Finally the optimal die parameters are obtained. The results lay the theoretical foundation for further studies on the computer assisted design for the dual slot die in the melt blowing process.

Sign in / Sign up

Export Citation Format

Share Document