Study on the flow field of the air jet from dual slot die in the melt blowing process

2001 ◽  
Vol 41 (6) ◽  
pp. 971-976 ◽  
Author(s):  
Ting Chen ◽  
Xiubao Huang
Keyword(s):  
Flow Field ◽  
Melt Blowing ◽  
Air Jet ◽  
Slot Die

Modeling the Air-Jet Flow Field of a Dual Slot Die in the Melt Blowing Nonwoven Process

2004 ◽  
Vol 74 (11) ◽  
pp. 1018-1024 ◽  
Author(s):  
Ting Chen ◽  
Xinhou Wang ◽  
Xiubao Huang
Keyword(s):  
Flow Field ◽  
Jet Flow ◽  
Melt Blowing ◽  
Air Jet ◽  
Slot Die

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.

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.

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.

Numerical modeling and experimental investigation of fiber diameter of melt blowing nonwoven web

2015 ◽  
Vol 27 (1) ◽  
pp. 91-98 ◽  
Author(s):  
Bo Zhao
Keyword(s):  
Flow Field ◽  
Field Model ◽  
Fiber Diameter ◽  
Jet Flow ◽  
Experimental Result ◽  
Computer Assisted ◽  
Melt Blowing ◽  
Content Type ◽  
Air Jet ◽  
Computer Assisted Design

Purpose – The purpose of this paper is to varify, the air drawing model and the air jet flow field model of dual slot shape die for a polymer in a melt blowing process were established, by the experimental results obtained with experimental equipment. Design/methodology/approach – The air jet flow field model is solved by introducing the finite difference method. The air drawing model of polymers in the melt blowing process was studied with the help of the simulation results of the air jet flow field. Findings – The higher air initial velocity and air initial temperature can all yield finer fibers and causes the fibers to be attenuated to a greater extent. Originality/value – The predicted fiber diameter agrees well with the experimental result, which verifies the reliability of these models. At the same time, the results also reveal the great potential of this research for the computer-assisted design of melt blowing technology.

Effect of slot end faces on the three-dimensional airflow field from the melt-blowing die

2020 ◽  
Vol 40 (7) ◽  
pp. 607-613
Author(s):  
Yudong Wang ◽  
Jianping Zhou
Keyword(s):  
Numerical Calculation ◽  
Flow Field ◽  
Field Distribution ◽  
Three Dimensional ◽  
Central Area ◽  
Computational Domain ◽  
Melt Blowing ◽  
Slot Die ◽  
Calculation Results ◽  
Airflow Field

AbstractIn order to investigate the effect of the slot ends of the melt-blowing die on the three-dimensional airflow field distribution and the fiber draft, the numerical calculation was carried out. The computational domain of the slot die was established with Gambit, and the flow field was calculated using FLUENT. Compared with the experimental data collected by a hot-wire anemometer, the numerical calculation results are credible. The results show that the slot end face has a certain influence on the three-dimensional flow field distribution under the melt-blowing die. The air velocity and temperature in the center region are quite different from those near the slot-end face. As the distance from the center of the flow field increases, the velocity and temperature on the spinning line begin to decrease. The velocity and temperature distributions of the spinning lines in the central area and nearby areas are almost the same; the temperature and velocity values on the spinning lines near the slot end are the lowest. The distribution characteristics of the three-dimensional airflow field could affect the uniformity of the fiber diameter and the meltblowing products.

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 Lateral Diffusion of a Free Air Jet in Slot-Die Melt Blowing for Microfiber Whipping

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 788 ◽  
Author(s):  
Sheng Xie ◽  
Wanli Han ◽  
Xufan Xu ◽  
Guojun Jiang ◽  
Baoqing Shentu
Keyword(s):  
High Speed ◽  
Lateral Diffusion ◽  
Polymer Melt ◽  
Nonwoven Material ◽  
Fiber Formation ◽  
High Speed Photography ◽  
Melt Blowing ◽  
Lateral Velocity ◽  
Air Jet ◽  
Slot Die

In melt blowing, microfibrous nonwoven material is manufactured by using high-speed air to attenuate polymer melt. The melt-blown air jet determines the process of polymer attenuation and fiber formation. In this work, the importance of lateral velocity on the fiber was first theoretical verified. The lateral diffused characteristic of the air flow field in slot-die melt blowing was researched by measuring the velocity direction using a dual-wire probe hot-wire anemometer. Meanwhile, the fiber path was captured by high-speed photography. Results showed that there existed a critical boundary of the lateral diffusion, however, air jets in the x–z plane are a completely diffused field. This work indicates that the lateral velocity in the y–z plane is one of the crucial factors for initiating fiber whipping and fiber distribution.

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.

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