The effect of melt compressibility on a high-speed wire-coating process

1986 ◽  
Vol 26 (6) ◽  
pp. 410-414 ◽  
Author(s):  
Tai-Shung Chung
Keyword(s):  
High Speed ◽  
Coating Process ◽  
Wire Coating ◽  
Melt Compressibility

Variable viscosity effects on third-grade liquid flow in post-treatment analysis of wire coating in the presence of nanoparticles

2018 ◽  
Vol 28 (10) ◽  
pp. 2423-2441 ◽  
Author(s):  
B. Mahanthesh ◽  
B.J. Gireesha ◽  
M. Archana ◽  
Tasawar Hayat ◽  
Ahmed Alsaedi
Keyword(s):  
Shear Stress ◽  
Numerical Solutions ◽  
Volume Fraction ◽  
Variable Viscosity ◽  
Post Treatment ◽  
Third Grade ◽  
Coating Process ◽  
Wire Surface ◽  
Content Type ◽  
Wire Coating

Purpose The features of coated wire product are measured by the flow and heat transport occurring in the interior of dies. Therefore, an understanding of characteristics of polymers momentum, heat mass transfer and wall shear stress is of great interest. Enhancement of heat transfer rate is fundamental need of wire coating process. Therefore, this study aims to investigate the effect of suspended nanoparticles in heat and mass transport phenomena of third-grade liquid in post-treatment of wire coating process. Buongiorno model for nanofluid is adopted. Two cases of temperature dependent viscosity are considered. Design/methodology/approach The governing equations are modelled with the help of steady-state conservation equations of mass, momentum, energy and nanoparticle concentration. Some appropriate dimensionless variables are introduced. Numerical solutions for the nonlinear problem are developed through Runge–Kutta–Fehlberg technique. The outcome of sundry variables for dimensionless flow, thermal and nanoparticle volume fraction fields are scrutinised through graphical illustrations. Findings The study’s numerical results disclose that the force on the total wire surface and shear stress at the surface in case of Reynolds Model dominate Vogel’s Model case. Impact of nanoparticles is constructive for force on the total wire surface and shear stress at the surface. The velocity of the coating material can be enhanced by the non-Newtonian property. Practical implications This study may provide useful information to improve the wire coating technology. Originality/value Effect of nanoparticles in wire coating analysis by using Brownian motion and thermophoresis slip mechanisms is investigated for the first time. Two different models for variable viscosity are used.

scholarly journals MHD Flow and Heat Transfer Analysis in Wire Coating Process Using Elastic-Viscous Fluid

2017 ◽  
Author(s):  
Zeeshan Khan ◽  
Rahan Ali Shah ◽  
Saeed Islam ◽  
Hamid Jan ◽  
Bilal Jan ◽  
...  
Keyword(s):  
Viscous Fluid ◽  
Linear Equations ◽  
Adomian Decomposition Method ◽  
Mhd Flow ◽  
Heat Transfer Analysis ◽  
Coating Process ◽  
Flow And Heat Transfer ◽  
Adomian Decomposition ◽  
Wire Coating ◽  
Optimal Homotopy Asymptotic Method

The most important plastic resins used for wire coating are Polyvinyl Chloride (PVC), Nylon, Polysulfone and Low-high density polyethylene (LDPE / HDPE). In this article,the coating process is performed using elastic-viscous fluid as a coating material for wire coating in a pressure type coating die. The elastic-viscous fluid is electrically conducted in the presence of an applied magnetic field. The governing non-linear equations are modeled and then solved analytically by utilizing an Adomian decomposition method (ADM). The convergence of the series solution is established. The results are also verified by Optimal Homotopy Asymptotic Method (OHAM). The effect of different emerging parameters such as non-Newtonian parameters α and β, magnetic parameter M and the Brinkman number Br on solutions (velocity and temperature profiles) are discussed through several graphs. Additionally, the current result also compares with the published work already available in the literature.

Experimental Investigation and Modeling of a New High Speed Coating Process

2016 ◽  
Vol 31 (3) ◽  
pp. 369-375
Author(s):  
M. Kallel ◽  
Y. Demay ◽  
J. F. Agassant ◽  
J. F. Chartrel ◽  
M. Grisot
Keyword(s):  
Experimental Investigation ◽  
High Speed ◽  
Coating Process

Dynamic Contact Angle of Modified Biopolymer Droplet on Urea Surface: Temperature Effects

2013 ◽  
Vol 594-595 ◽  
pp. 566-570 ◽  
Author(s):  
Yon Norasyikin Samsudin ◽  
Ku Zilati Ku Shaari ◽  
Zakaria Man ◽  
Suriati Sufian
Keyword(s):  
Contact Angle ◽  
High Speed ◽  
Dynamic Contact Angle ◽  
Ccd Camera ◽  
Dynamic Contact ◽  
Droplet Impact ◽  
Coating Material ◽  
Coating Process ◽  
Fluidised Bed ◽  
Impact Behaviour

The droplet impact behaviour provides the particle coating characterization during the coating process of controlled release fertiliser. To have a good coating uniformity around the urea granules, it is necessary to enhance the wettabitily properties between the coating material and urea surface. The biopolymer material is preferred as the coating material because this polymer may degrade and will not cause any environmental impact to the environment. Various compositions of starch/urea /borate/lignin were prepared and evaluated for the wettability properties. The wettability characteristic measured is the dynamic contact angle. The high speed Charged-Couple Device (CCD) camera was used to capture the images of this droplet impact behaviour. Temperature plays an important factor during wetting stage because the coating material must be completely dried in continuous coating process in fluidised bed. From this analysis, it indicates that a composition of starch/urea/ borate (50/15/2.5) with 10% lignin has the best wettability characteristic and thus suitable to be used as a coating material. The ideal temperature for the coating process is 60°C.

Coat Thickness in Wire-Coating Process With Corrugated Die

2002 ◽  
Author(s):  
B. Phuoc Huynh
Keyword(s):  
Wave Amplitude ◽  
Viscous Fluids ◽  
Coating Process ◽  
Wire Radius ◽  
Exit Angle ◽  
Interesting Aspect ◽  
Swelling Behaviour ◽  
Annular Gap ◽  
Wire Coating ◽  
Newtonian Type

Effects of die wall corrugation on coat thickness t in the wire-coating process are investigated numerically, using non-isothermal viscous fluids of a Newtonian type as coating material and a finite element method. Corrugation is assumed to be in the form of sine waves near die exit. It can be seen that shorter wavelength or larger wave amplitude depresses t, whereas higher Nahme-Griffith number Na increases it; however, the changes in t are only very small. t is also depressed slightly when die wall’s exit angle θ is large and negative; but in general it is insensitive to variation in θ when this is small. That t is only slightly affected by Na and θ is in stark contrast to extrudate’s swelling behaviour in simple extrusion through annular dies under comparable conditions. Furthermore, wire speed does not affect t over the ranges of Na value considered here. One interesting aspect relating to isothermal smooth-wall situation is that the ratio t/ΔR, ΔR being annular gap size, is nearly constant and equal to 0.5, independent of wire radius ratio Rwire/Rdie. This constancy is in contrast to the variation in coat thickness that results from a pure drag flow in the annulus.

Halogen Free Flame Retardant Agents for Polypropylene in Wire Coating Process

2007 ◽  
Vol 247 (1) ◽  
pp. 371-378 ◽  
Author(s):  
Luciano Di Maio ◽  
Domenico Acierno ◽  
Daniela Di Martino
Keyword(s):  
Flame Retardant ◽  
Coating Process ◽  
Wire Coating ◽  
Halogen Free
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