air-flow field of the melt-blowing slot die via numerical

Production of polypropylene melt blown nonwoven fabrics

Production of polypropylene melt blown nonwoven fabrics: Part I—Numerical simulation and prediction of fibre diameter Zhao Boa College of Textiles Zhongyuan University of Technology Henan Zhengzhou 450007 P R China Received 7 October 2010 revised received and accepted 21 September 2011 The air drawing model and the air jet flow field model of dual slot inset sharp die of melt blowing

Production of polypropylene melt blown nonwoven fabrics

Production of polypropylene melt blown nonwoven fabrics: Part I—Numerical simulation and prediction of fibre diameter Zhao Boa College of Textiles Zhongyuan University of Technology Henan Zhengzhou 450007 P R China Received 7 October 2010 revised received and accepted 21 September 2011 The air drawing model and the air jet flow field model of dual slot inset sharp die of melt blowing

US Patent for Electret nanofibrous web as air filtration

The present invention is directed toward an improved air filtration medium comprising a single layer polymeric nanofibrous web comprising a single source randomly intermingled fiber network with electrostatic charge up to −20 kV a filtration efficiency range from about 70% to about 99 99% and an air resistance less than about 2 5 mm wg for 0 3 diameter micron particles

Silk Protective Clothing and Eco

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Numerical analysis of new modified melt‐blowing dies for

Sun and Wang combine the applications of numerical simulation and genetic algorithm or of numerical simulation and orthogonal array design to optimize the air flow field for melt‐blowing slot die Krutka et al used CFD technology and experimental apparatus to analyze the air flow field from multiple jets in the Schwarz melt‐blowing die with arrays of annular jets The rectangular slot die

Method and apparatus for collecting and processing

09 03 1999Method and apparatus for collecting and processing blood United States Patent 5879624 Abstract: A container is provided that is disposable for first collecting blood delivered from a patient preferably by means of a vacuum draw of blood into a container and then the blood in the container is treated The treatment is provided by an at least partial a back-and-forth or reciprocating

An improved Lagrangian approach for simulating fiber

Melt blowing is a one-step approach for manufacturing microfibrous nonwovens In slot-die melt blowing a pair of air jets with high velocity and temperature is applied on the polymer and attenuates the polymer in to fibers The fiber motion which was called vibration or whipping plays a crucial role in expressing the drag mechanism In this study an improved Lagrangian numerical approach was

Effects of the die Parameters on the Air Flow Field from

Effects of the die Parameters on the Air Flow Field from a Dual Slot Melt Blowing Die p 1347 Preparation of / Polyaniline (PANI) Compound Nanofiber via Electrospinning p 1352 Soft Compressive Porous Material Applied to Transportation p 1357 Evaluation of the Conformity of Clothing Color to Wearing Scenes p 1362 Applied Researches of Chitosan and Silicon Sol as Fixing Agent on Ramie p

12 Yafeng Sun Bowen Liu Xinhou Wang Yongchun Zeng* Air-Flow Field of the Melt-Blowing Slot Die via Numerical Simulaiton and Multiobjective Genetic Algorithms Journal of Applied Polymer Science 2011 122(6): 3520-3527 13 Yongchun Zeng Yafeng Sun Xinhou Wang Numerical Approach to Modeling Fiber Motion During Melt Blowing Journal of

Investigation into the effect of the angle of

Abstract The effect of the angle of dual slots on an air flow field in melt blowing was researched via numerical simulation Through establishing the geometric model of air flow field in melt blowing with dual slots meshing designating the boundary conditions and their parameters and numerical simulation the result illustrates the influence of the angle of dual slots on the variations of

Lateral Diffusion of a Free Air Jet in Slot

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

12 Yafeng Sun Bowen Liu Xinhou Wang Yongchun Zeng* Air-Flow Field of the Melt-Blowing Slot Die via Numerical Simulaiton and Multiobjective Genetic Algorithms Journal of Applied Polymer Science 2011 122(6): 3520-3527 13 Yongchun Zeng Yafeng Sun Xinhou Wang Numerical Approach to Modeling Fiber Motion During Melt Blowing Journal of

Testing and Evaluating of the Comfort Properties of PTT

PTT knitted fabrics comfort properties of air permeability moisture permeability and moisture conductivity were tested and evaluated The results show that: The comfort properties of PTT knitted fabrics is much better than that of PET The ranking of comprehensive comfort properties of PTT knitted fabrics with different materials and structures from excellent to poor is-PTT/PET filament weft

Wang Yudong Wang Xinhou * Numerical Analysis of New Modified Melt-Blowing Dies for Dual Rectangular Jets POLYMER ENGINEERING AND SCIENCE 54(1) 110-116 2014 4 Han Wanli Nurwaha Deogratias Li Chulin Wang Xinhou * Free Surface Electrospun Fibers:The Combined Effect of Processing Parameters POLYMER ENGINEERING AND SCIENCE 54(1) 189-197 2014

Particle Image Velocimetry (PIV) Investigation of the

In order to explore the forming mechanism of the fiber whipping motion in slot-die melt blowing the turbulent airflow in slot-die melt blowing was measured online with the approach of the Particle Image Velocimetry (PIV) technique The PIV results visualized the structure of the turbulent airflow and provided the distributions of air velocity components (vx vy and vz)

Meltblown technology for production of polymeric

This work summarizes the current state of knowledge in the area of meltblown technology for production of polymeric nonwovens with specific attention to utilized polymers die design production of nanofibers the effect of process variables (such as the throughput rate melt rheology melt temperature die temperature air temperature/velocity

Journal of Physics: Conference Series Volume 916 2017

Melt blowing is one-step approach for producing microfibrous nonwovens In this study the characteristics of air flow field in different die melt blowing were studied CFD simulation analysis was adopted to complete the air flow field simulation The characteristics of the air flow fields in different die melt blowing were revealed and

Influence of Laval nozzles on the air flow field in melt

In this paper we present numerical simulations of the air flow field associated with the melt blowing process (in the absence of meltblown fibers) with increasing P inlet The air flow field exiting a melt blowing die has been characterized experimentally with and without a Laval nozzle using a Schlieren visualization technique To the best of our knowledge this represents the first

Inverse prediction and optimization of flow control

Inverse prediction and optimization of flow control conditions for confined spaces using a CFD-based genetic algorithm Y Sun X WangOptimization of air flow field of the melt blowing slot die via numerical simulation and genetic algorithm J Appl Polym Sci 115 (3) (2010) pp 1540-1545 Google Scholar A G Muoz V Ayala-Ramrez J A Alfaro-Ayala B M T AcostaOptimization of the

Structure and Air Permeability of Melt Blown Nanofiber

Sun Y Wang X (2010) Optimization of air flow field of the melt blowing slot die via numerical simulation and genetic algorithm J Appl Polym Sci 115: 1540-1545 J Appl Polym Sci 115: 1540-1545 Tate BD Shambaugh RL (2004) Temperature fields below melt-blowing dies of various geometries

Advanced Textile Materials Part 1

Main Advanced Textile Materials Part 1 Advanced Textile Materials Part 1 Qian Xiaoming Liu Huawu (Eds ) This book contains internationally peer-reviewed papers from the 2011 International Conference on Textile Engineering and Materials (ICTEM 2011) 23-25 September 2011 Tianjin China This book covers the subject areas of natural fibers chemical fibers fiber manufacturing

Search results for: spun/melt blown

The main HMA application technology in TBS lamination is the slot die application in which HMA is spread on the top of the NW along the whole width at high temperatures in the melt form Then the NW is passed over chiller rolls with a certain open time depending on the line speed HMAs are applied at certain levels in order to provide a proper de-lamination strength in cross and machine

Influence of long chain branching on fiber diameter

In this work linear isotactic polypropylene (L-PP) and long-chain branched polypropylene (LCB-PP) miscible blend both having comparable weight average molecular weight zero-shear viscosity and polydispersity index were used to produce nonwovens via melt blown technology in order to understand the role of long chain branching in the fiber diameter distribution

Turbulent air flow field in slot

The melt-blowing air flow field which is widely believed to be turbulence determines the process of fiber formation In this study the turbulent air flow field in slot-die melt blowing was experimental measured by hot-wire anemometer The fluctuations of air velocity and temperature the mean velocity and mean temperature were measured and analyzed moreover the relationship between

Numerical analysis of new modified melt

Sun and Wang (12) (13) combine the applications of numerical simulation and genetic algorithm or of numerical simulation and orthogonal array design to optimize the air flow field for melt-blowing slot die Krutka et al (14) (15) used CFD technology and experimental apparatus to analyze the air flow field from multiple jets in the Schwarz melt-blowing die with arrays of annular jets

Advanced Textile Materials Part 1

Advanced Textile Materials Part 1 Details This book contains internationally peer-reviewed papers from the 2011 International Conference on Textile Engineering and Materials (ICTEM 2011) 23-25 September 2011 Tianjin China This book covers the subject areas of natural fibers chemical fibers fiber manufacturing technology principles of textile design structure properties and

Numerical Simulation the Air Jet Flow Field of a Dual

With the help of numerical simulations of the air flow field the air drawing model of melt blowing polymer can be solved by using a fourth order Runge-Kutta method Experiments are performed on melt blowing at our university The effect of dual slot inset sharp die distance on the fiber diameter can be investigated with the aid of computer simulations All the die parameters and processing

Journal of Physics: Conference Series PAPER OPEN ACCESS

the numerical model and the mesh dividing for the air flow field in swirl die melt blowing different with the method of mesh dividing hybrid meshes are applied in the simulation of swirl die Figure 1 Numerical simulated model of air flow field in slot die (a) is the whole air flow field (b) is the 1/4 model used in numerical simulation

Turbulent air flow field in slot

Melt blowing is an industrial approach for producing microfibrous nonwoven materials utilizing high-speed air to attenuate polymer melt The melt-blowing air flow field which is widely believed to be turbulence determines the process of fiber formation In this study the turbulent air flow field in slot-die melt blowing was experimental measured by hot-wire anemometer

US Patent for Slot die position adjustment control Patent

A system comprises a slot die including an applicator slot extending about a width of the slot die wherein the applicator slot is in fluid communication with a fluid flow path through the slot die and a plurality of actuators spaced about the width of the slot die wherein each actuator in the plurality of actuators is operable to adjust a cross-directional thickness of the fluid flow path

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