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.

Temperature Distribution of the Air Flow Field in Melt Blowing Process: Simulation and Measurement

2013 ◽  
Vol 796 ◽  
pp. 268-271
Author(s):  
Xiu Qing Wang ◽  
Chuan Xu ◽  
Ting Chen ◽  
Li Li Wu
Keyword(s):  
Temperature Distribution ◽  
Flow Field ◽  
Air Temperature ◽  
Air Flow ◽  
Great Influence ◽  
Simple Algorithm ◽  
Measuring System ◽  
Melt Blowing ◽  
Nonwoven Fabrics ◽  
Slot Die

The melt blown nonwoven fabrics are characterized by superfine fiber structures. The key technology of achieving superfine fibers is the polymer drawing by the high velocity hot air jets. The temperature distribution of the air flow field has great influence on the polymer drawing. In this paper, the air temperature distribution of the dual slot die on an HDF-6D melt blowing nonwoven equipment is simulated and measured. The air flow field model of the dual slot die is established and solved numerically using the finite volume method and SIMPLE algorithm. The air temperature is measured with a temperature measuring system built for this research. Experimental results show that the simulation results of the air temperature coincide with the measured data which indicates the air flow flied model is effective. As this research is performed on an industrial melt blowing equipment, the results have great application values for actual production of melt blowing.

Numerical Study on the Polymer Drawing of the Unsymmetrical Air Flow Field in Melt Blowing Process

2013 ◽  
Vol 796 ◽  
pp. 264-267
Author(s):  
Yao Ma ◽  
Hua Jun Chen ◽  
Ting Chen ◽  
Li Li Wu
Keyword(s):  
Flow Field ◽  
Air Temperature ◽  
Fiber Diameter ◽  
Air Flow ◽  
Transverse Displacement ◽  
Air Velocity ◽  
Melt Blowing ◽  
Air Jets ◽  
Hot Air ◽  
Slot Die

Melt blowing is a typical nonwoven process for producing superfine fibers. In this process, the high velocity hot air jets attenuate the polymer melt into superfine fibers. Therefore, the fiber diameter is strongly affected by the air flow field. Dual slot die is one of the widely used melt blowing dies. Hot air emits from the two slots symmetrically. What will happen to the polymer drawing if the air jets are unsymmetrical? In this paper, the unsymmetrical air flow field of the dual slot die in melt blowing process is simulated numerically. The distributions of air velocity and air temperature are obtained. The polymer drawing model is then solved with the aid of the simulation results of air velocity and air temperature. The diameter and transverse displacement of the threadline along the spinline is achieved. The result shows that the threadline diameter of unsymmetrical air flow field is larger than that of the symmetrical air flow field and the threadline tends to deflect because of the unsymmetrical air jets. This paper helps to indicate the research direction for further decreasing the fiber diameter of melt blown nonwoven fabrics.

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.

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.

Sign in / Sign up

Export Citation Format

Share Document