modeling polymer air drawing in the melt blowing

TECHNICAL GUIDE

areas in terms of the polymer's coating performance In the air gap some of the properties of the laminate are most affected by extrusion conditions It is here that the molten web is drawn down and necks-in (see pg 8) and oxidation TongWeis place A large gap may cause premature cooling of the melt

Melt Blown Fabric Machine Melt Blown Machine

The melt-blown process uses high-speed hot air to draw a thin stream of polymer melt extruded from the die orifice thereby forming ultra-fine fibers and condensing on the screen or roller and relying on self-adhesion and become a non-woven fabric

Numerical approach to modeling fiber motion during melt

Melt blowing involves applying a jet of hot air to an extruding polymer melt and drawing the polymer stream into microfibers This study deals with the dynamic modeling of the instabilities and related processes during melt blowing A bead‐viscoelastic element model for fiber formation simulation in the melt blowing process was proposed Mixed Euler‐Lagrange approach was adopted to derive

Blowing Process

The concept of melt blowing of thermoplastics to form ultrafine fibers (10 μm) was first demonstrated back in 1954 by Van A Wente of the Naval Research Laboratories where there was interest in developing such fibers to collect radioactive particles in the upper atmosphere to monitor worldwide testing of nuclear weapons

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

Polymer Extrusion Introduction

As the draw-down region is typically exposed to the air the temperature may decrease as it flows down due to the cooling by air However the temperature variation may not be very large unless air is blown against the polymer melt for forced convective cooling

Blown Film

The blown film process involves extruding a relatively thick tube which is then expanded or blown by internal air pressure to produce a relatively thin film The air-cooled blown film process is in very widespread use mainly for polyolefin films The process needs a melt strength greater than that required by cast film processes so lower melt temperatures are used

Numerical approach to modeling fiber motion during

Melt blowing involves applying a jet of hot air to an extruding polymer melt and drawing the polymer stream into microfibers This study deals with the dynamic modeling of the instabilities and related processes during melt blowing A bead‐viscoelastic element model for fiber formation simulation in the melt blowing process was proposed Mixed Euler‐Lagrange approach was adopted to derive

Application of Polymer Rheology in Melt Blowing Process

Application of Polymer Rheology in Melt Blowing Process and Online Rheological Sensor Yizhong Wang University of Tennessee - Knoxville This Dissertation is brought to you for free and open access by the Graduate School at Trace: Tennessee Research and Creative Exchange It has been accepted for inclusion in Doctoral Dissertations by an authorized administrator of Trace: Tennessee Research and

Modeling the nanofiber fabrication with the melt blowing

Modeling the nanofiber fabrication with the melt blowing annular die Li-Li Wu 1 2 However the air encircles the polymer melt entirely in the case of the annular die which is in favor of the polymer drawing and thus manufacture of nanofibers Because nanofibers have excellent filtration and adsorption properties and melt blowing has a higher output than electrospinning melt blowing has

Modeling of pneumatic melt drawing of polypropylene super

Modeling of pneumatic melt drawing of polypropylene super-thin fibers in the Laval nozzle A BLIM L JARECKI∗ and S BLONSKI Institute of Fundamental Technological Research of the Polish Academy of Sciences 5B Pawinskiego St 02-106 Warsaw Poland Abstract

Numerical modeling and experimental investigation of

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 – 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 – The predicted fiber diameter agrees well with the experimental result which verifies the

Experimental study and numerical simulation the air jet

At the same time the air jet flow field model of the dual slot sharp inset die of polypropylene polymer nonwovens fabrics in melt blowing process was also established The air jet flow field model was solved by using the finite difference method

A Lagrange Type Polymer Drawing Model of the Melt

Melt blowing process can produce superfine fibers In this processs the polymer is drawn by high velocity hot air Lagrange method is empolyed to establish and solve the polymer drawing model The fiber diameter and vibration are predicted with the model The predicted fiber diameter concides with the experimental data The fiber vibration becomes larger and larger with the increase of the

Fiber spiral motion in a swirl die melt

Melt blowing is a major 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 It is known that the essential electrospinning mechanism is a rapidly whipping jet in an electric field

Computer Modeling Air Drawing in Melt Blowing Nonwovens

Computer Modeling Air Drawing in Melt Blowing Nonwovens Process Produced Open Access Journal Page 42 air drawing model The results also reveal the great potential for this research in the computer-assisted design (CAD) of melt blowing process technology and equipment

Melt Spinning and Drawing of Polyethylene Nanocomposite

Melt Spinning and Drawing of Polyethylene Nanocomposite Fibers with Organically Modified Hydrotalcite Luca Fambri 1 2 Izabela Dabrowska 1 Alessandro Pegoretti 1 2 Riccardo Ceccato1 2 1Department of Industrial Engineering University of Trento via Mesiano 77 38123 Trento Italy 2National Interuniversity Consortium of Materials Science and Technology (INSTM) Via G Giusti 9

Nanofibers from Melt Blown Fiber

Bimodal Nanofiber and Microfiber Nonwovens by Melt-Blowing Immiscible Ternary Polymer Blends Industrial Engineering Chemistry Research 2020 59 (12) 5238-5246 DOI: 10 1021/acs iecr 9b04887 Xibo Hao Yongchun Zeng A Review on the Studies of Air Flow Field and Fiber Formation Process during Melt Blowing

Exploring the Polymer Drawing of the Air Centrifugal

Keywords:Air centrifugal spinning air-flow field model nanofiber polymer drawing simulation Abstract: Background and Objective: The air-flow field of the air centrifugal spinning is simulated and measured The simulated air velocities coincide well with the measured ones confirming the correctness of the air-flow field model

An overview of molten polymer drawing instabilities

modelling strategies linear stability analysis and direct simulation applied to the different fibre and film processes are discussed 1 Introduction Numerous polymer processes (fibre spinning cast film or film blowing) involve a stretching step after the initial extrusion step Drawing instability (draw resonance) is

Optimum Design for the Dual Slot Die Parameters of Melt

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

The Nonwovens Formation *Leszek Jarecki in the Melt

In melt-blowing a polymer is melted and extruded through a capillary while heated air is blown through an air nozzle The aerodynamic drag of the air jets on the polymer provides the attenuation force that draws the polymer streams into fine diameter fibres In this paper the following factors are presented: a modified mathematical model of

Nanofibers from gas

The concept of a gas-assisted polymer melt electrospinning process is presented This technique allows for reduced quenching of the melt jet in the spinning region and thus increasing the jet attenuation rate and resulting in production of sub-micron scale fibers A comprehensive melt electrospinning model was used to analyze the effects of the heated air stream on the polymer jet It was

A Lagrange Type Polymer Drawing Model of the Melt

Melt blowing process can produce superfine fibers In this processs the polymer is drawn by high velocity hot air Lagrange method is empolyed to establish and solve the polymer drawing model The fiber diameter and vibration are predicted with the model The predicted fiber diameter concides with the experimental data The fiber vibration becomes larger and larger with the increase of the

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