Air Drawing Model Of Polymer Research Articles

Influence of processing parameters on fibers diameter and web evenness of polypropylene spunbonding nonwoven fabrics in wide slot positive pressure drafting assembly of spunbonding process

The air drawing model of polymer polypropylene (PP) spunbonding nonwovens has been established. The influences of the density and the specific heat capacity of polymer melt at constant pressure changing with polymer temperature on the fiber diameter have been studied. The air drawing model of polymer in spunbonding is confirmed by the experimental results obtained with our university's equipment. The effects of the processing parameters on fibers web evenness of PP spunbonding nonwoven fabrics in wide slot positive pressure drafting assembly of spunbonding process have also been investigated. The predictions of the filament fiber diameters, crystallinities, and birefringences are coincided well with the experimental data. It is found that a medium polymer melt temperature, monomer suction wind speed, drawing pressure, cross air blow speed, and air control distance have a significant influence on the web evenness and quality, which are beneficial to produce more uniformity fibers web. The experimental results show that the agreement between the results and experimental data is very better, 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 (CAD) of spunbonding technology. POLYM. ENG. SCI., 58:1268–1277, 2018. © 2017 Society of Plastics Engineers

Numerical simulation and experimental investigations of air drawing model and air jet flow field model in wide slot positive pressure spunbonding process

An air drawing model of polymers and a model of the air jet flow field model in wide slot positive pressure spunbonding process are established. The air jet flow field model is solved by means of the finite difference method. The numerical simulation computation results of distributions of the air velocity match quite well with the experimental data. We find that the variation of the density and the specific heat capacity of polymer melt at constant pressure with polymer temperature have much effects on fiber diameter. The newly developed formulas were incorporated into a spunbonding theoretical model to predict the fiber diameter of nonwoven web. The air drawing model of polymer is solved with the help of the distributions of the air velocity measured by a Particle Image Velocimetry (PIV). The predicted fiber diameters agree with the experimental data well. It can be concluded that the higher air pressure, higher air velocity and air temperature can yield the finer fibers diameter. The higher inlet pressure and smaller jet angle will all cause higher x-axis position of air velocity and air pressure, which are beneficial to the air drawing of the polymer melt and thus to reducing the fiber diameter.

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

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.

Dynamic modeling and simulation of bottom outlet air flow field in wide slot positive pressure spunbonding drawing process

The air jet flow has an important influence in wide slot positive pressure spunbonding process that not only includes the filament fiber diameter, crystallinity, and birefringence, but also the fiber web evenness. In this work, the air drawing model and the air jet flow field model of bottom outlet in spunbonding process are established and studied. The characteristics and regularities of the plane air jet flow in wide slot positive pressure spunbonding process are also demonstrated. It is simulated by means of the finite difference method. The numerical simulation computation results of distribution of the air velocity match quite well with the experimental data. The air drawing model of polymer is solved with the help of the distribution of the air velocity. The predicted filament fiber diameter, crystallinity, and birefringence agree well with the experimental data. It was found that higher initial velocity and initial temperature of air can yield finer fibers, and its effect was very significant. The results also reveal the great potential for this research in the computer-assisted design of spunbonding technology and equipment.

Numerical prediction and experimental studies on the influence of spunbonding processing parameters on the fiber diameter

Purpose – The polymer air-drawing model of spunbonding nonwovens has been established. The influence of the density and the specific heat capacity of polymer melt at constant pressure changing with polymer temperature on the fiber diameter have also been studied. The paper aims to discuss these issues. Design/methodology/approach – TDMA method is used to solve the difference equations. Findings – It can be concluded that a lower polymer throughput rate, a higher polymer melt initial temperature, a higher air initial temperature, and a higher air initial velocity can all produce finer fibers. Originality/value – The results also reveal the great potential for this research in the computer-assisted design of spunbonding technology.

Numerical Simulation and Experimental Study of the Polypropylene Polymer Air Drawing Model and Air Jet Flow Field Model in the Spunbonding Nonwoven Process

The air drawing model of the polypropylene polymer and the model of the air jet flow field in a spunbonding process are presented and solved by introducing the numerical computation results of the air jet flow field of an aerodynamic device. The air jet flow field model is simulated by means of the finite difference method. The effect of the density and specific heat capacity of polymer melt at a constant pressure changing with the polymer temperature on the fiber diameter was studied. We find that the variation of the density and the specific heat capacity of polymer melt at constant pressure with polymer temperature greatly effects the fiber diameter. Compared with the existing drawing model, the new ones include more processing parameters and are more accurate. The newly developed formulas were incorporated into a spunbonding theoretical model to predict the fiber diameter of nonwoven web. The numerical simulation computation results of the distributions of the z-components of the air velocity match quite well with the experimental data. The air drawing model of polymer is solved with the help of the distributions of the air velocity measured by particle image velocimetry (PIV). The model’s predictions of the filament fiber diameters, crystallinities, and birefringences coincide well with the experimental data. It can be concluded that the higher initial air temperature can yield finer filament fiber diameter and the higher initial air velocity can produce finer fiber diameter as well. The experimental results show that the agreement between the results and experimental data is much better, which verifies the reliability of these models. At the same time, also, they reveal great prospects for this work in the field of computer assisted design (CAD) of the spunbonding process.

A numerical computation and experimental study of air drawing model of polymers in spunbonding nonwoven process

AbstractThe air drawing model of polyethylene terephthalate polymer and the model of the air jet flow field in spunbonding process are established. The air jet flow field model is simulated with the help of the finite difference method. The numerical simulation computation results of distributions of the air velocity and air temperature are in agreement with the experimental data. The air drawing model of polymer is solved with the aid of the distributions of the air velocity measured by a particle image velocimetry. The predicted fiber diameters tally with the experimental data well. It can be concluded that the higher initial air temperature can generate finer filament fiber diameter, and the higher initial air velocity can yield the finer fiber diameter as well. The experimental results show that the agreement between the predicted results and the experimental data is very good, which confirms the reliability and the accuracy of these mathematical models. Also, they reveal great prospects for this work in the field of computer assisted design of spunbonding process. POLYM. ENG. SCI., 2013. ©2012 Society of Plastics Engineers

Primary Industrial Verification of the Polymer Air Drawing Model for the Melt Blowing Nonwoven Process

Nonwoven samples are collected from industrial equipments in four nonwoven factories. The processing parameters and equipment parameters are also obtained. The fiber diameters of the nonwoven samples are measured by using the image analysis method and compared with the predicted fiber diameters by solving the polymer air drawing model. The results show that the predicted fiber diameters coincide with the measured fiber diameter very well, which confirms that the polymer air drawing model is effective in predicting fiber diameters of nonwoven fabrics produced by industrial equipments in nonwoven factories. The results reveal the practical value of this theoretical research on the melt blowing technology.

Simulation and Experimental Investigations of Fiber Diameter of Spunbonding Nonwovens by Means of the Air Jet Flow Field Model

The air jet flow field models of spunbonding process are founded. It is simulated by means of the finite difference method. The numerical simulation computation results of distributions of the air velocity match quite well with the experimental data. The air drawing model of polymer is solved with the help of the distributions of the air velocity measured by a particle image velocimetry. The predicted filament fiber diameter agrees with the experimental data well.

Investigation of Fiber Diameter in Spunbonding Process via Mathematical Modeling

The polymer air-drawing model of polypropylene (PP) spunbonding nonwovens has been established. The influence of the density and the specific heat capacity of polymer melt at constant pressure changing with polymer temperature on the fiber diameter have been studied. The effects of the processing parameters on the final filament fiber diameter have also been investigated. A lower polymer throughput rate, a higher polymer melt temperature, a higher primary air temperature, a higher primary cool air velocity, and a higher air suction speed can all produce finer fibers, while fiber diameters first decrease with increases in the venturi gap and then increase with increases in the venturi gap.

Predicting the Diameter of Polyamide Superfine Fiber of Nonwoven Fabrics

The polymer air drawing model of polyamide melt blown nonwoven fabrics is established. The predicted fiber diameter coincides with the experimental data. The effects of the processing parameters on the fiber diameter are investigated. It is found that smaller polymer flow rate, higher initial polymer temperature, larger initial air velocity and larger die-to-collector distance can all produce finer fibers while too high initial air velocity and too large die-to-collector distance contribute little to the polymer drawing of polyamide melt. The results show great perspective of this research in the field of computer assisted design of the melt blowing technology.

Numerical computation of the fiber diameter of melt blown nonwovens produced by the inset die

AbstractMelt blowing is used commercially as a one‐step process for converting polymer resin directly into a nonwoven mat of microfibers. The inset die is often used to produce polymeric fibers in the melt blowing process. The air jet flow field model for the dual slot inset die is established. The flow field model is solved by using the finite difference method. The numerical computation results of the air velocity distribution coincide with the experimental data. Then the air drawing model of polymers in the melt blowing process established in our previous research is solved with the aid of simulation results of the air jet flow field. The final fiber diameter of the nonwoven fabrics predicted by the air drawing model of polymers tallies with the experimental data. The results show the great potential of this research for the computer assisted design of melt blowing technology and equipment. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009

Effects of processing parameters on the filament fiber diameter of spunbonded nonwoven fabrics

AbstractThe air drawing model of polymer in spunbonding is established. The air drawing model of polypropylene polymer in spunbonding is confirmed by the experimental results obtained with the help of our university's equipment. The predicted filament fiber diameter is in accordance with the experimental data. The effects of the process parameters on the filament fiber are investigated in this article. It is found that a lower polymer throughput rate, a higher polymer melt temperature, a higher primary air temperature, a higher air suction speed, a higher quench pressure, a higher venturi gap can all yield finer fiber, whereas the effect of the web basis weight is not significant. The results show great prospects for this research in the field of computer assisted design of spunbonding technology. POLYM. ENG. SCI., 47:510–515, 2007. © 2007 Society of Plastics Engineers.

Effects of Processing Parameters on the Fiber Diameter of Melt Blown Nonwoven Fabrics

Our air drawing model of polymers in the melt blowing process is verified by the experimental results obtained with our university’s equipment. The predicted fiber diameters tally well with the experimental data. The effects of the processing parameters on the fiber diameters are further investigated in this paper. We find that a lower polymer flow rate, a higher initial polymer temperature, a higher initial air velocity, and a higher polymer melt flow index can all produce finer fibers, while the effect of the initial air temperature is insignificant. The results reveal the great potential of this research for computer assisted design of the melt blowing technology.

Air drawing of polymers in the melt blowing nonwoven process: mathematical modelling

An air drawing model of polymers and a model of the air jet flow field in the melt blowing process are established. The flow field model is solved using the finite difference method. The numerical computation results of distributions of the air velocity and air temperature coincide with the experimental data. The air drawing model of polymers is solved with the aid of the distributions of the air velocity and air temperature. The predicted fibre diameter tallies well with the experimental data. It is found that a higher initial air velocity can produce finer fibres, while the effect of the initial air temperature is not significant. The results show great prospects for this research in the field of computer assisted design of melt blowing technology and equipment.