Viscous dissipation in plastic pipe extrusion

2013 ◽  
Vol 53 (10) ◽  
pp. 2205-2218 ◽  
Author(s):  
Chanyut Kolitawong ◽  
A. Jeffrey Giacomin ◽  
Udomkiat Nontakaew
Keyword(s):  
Viscous Dissipation ◽  
Plastic Pipe ◽  
Pipe Extrusion

Elimination of Sag in Plastic Pipe Extrusion

1992 ◽  
Vol 7 (2) ◽  
pp. 140-143 ◽  
Author(s):  
D. N. Githuku ◽  
A. J. Giacomin
Keyword(s):  
Plastic Pipe ◽  
Pipe Extrusion

Plastic pipe solidification in extrusion

2018 ◽  
Vol 38 (6) ◽  
pp. 591-603
Author(s):  
Pongthep Poungthong ◽  
Chanyut Kolitawong ◽  
Chaimongkol Saengow ◽  
Alan Jeffrey Giacomin
Keyword(s):  
Residual Stress ◽  
Cooling System ◽  
Outer Wall ◽  
Solidification Time ◽  
Solidification Temperature ◽  
Pipe Surface ◽  
Plastic Pipe ◽  
External Cooling ◽  
Wall Boundary Conditions ◽  
Pipe Extrusion

AbstractIn plastic pipe extrusion, hot molten extrudate emerges from an annular. This highly viscous liquid is then cooled and solidified, calledquenching, in a quench tank. In this paper, we focus on the external cooling system. We use an adiabatic inner wall and differing outer wall boundary conditions: isothermal and convection. The solid-liquid interface, at the solidification temperature, moves inward with deceleration. We adimensionalize the energy balance and solve for the interface speed in terms of the solidifcation coefficient,λ. We arrive at the exact solutions for the evolving solidified thickness. Finally, we use the residual stress model developed by Jansen [Int. Polym. Proc. 1994, 9, 82–89]. to predict the compressive residual stress at the outer pipe surface. Our new exact solution for the solidification time agrees well with the data from the plastic pipe industry. The goals of this paper are to help plastics engineers calculate the solidification time, to design the cooling chamber and to predict the residual quenching stress.

scholarly journals Knuckle formation from melt elasticity in plastic pipe extrusion

2017 ◽  
Vol 242 ◽  
pp. 11-22 ◽  
Author(s):  
C. Saengow ◽  
A.J. Giacomin ◽  
C. Kolitawong
Keyword(s):  
Plastic Pipe ◽  
Melt Elasticity ◽  
Pipe Extrusion

Simulation of Slump in Plastic Pipe Extrusion

1992 ◽  
Vol 114 (1) ◽  
pp. 81-83 ◽  
Author(s):  
D. N. Githuku ◽  
A. J. Giacomin
Keyword(s):  
Numerical Scheme ◽  
Cold Water ◽  
Pipe Wall ◽  
Large Diameter ◽  
Three Dimensional ◽  
Pipe Wall Thickness ◽  
Plastic Pipe ◽  
Model Predictions ◽  
Long Time ◽  
Pipe Extrusion

Extruded plastic pipe leaving an annular die is solidified in a long cooling tank by spraying the outer surface with cold water. The inside surface can take a long time to solidify as the solidification progresses radially inward. This results in flow of molten polymer down the inside of the pipe. This gravity flow of molten extrudate is called slumping, and it can cause serious nonuniformity in pipe wall thickness particularly in large diameter, thick walled pipes. It can also lead to another phenomenon known as “knuckle” formation where melt accumulates at specific locations. A simple numerical scheme to model this flow has been developed. Three-dimensional graphical illustrations of the slumping phenomenon based on this simulation are presented in this paper. The model predictions have been compared with commerical pipe data and they are in qualitative agreement.

Terahertz inline wall thickness monitoring system for plastic pipe extrusion

2014 ◽  
Author(s):  
J. Hauck ◽  
D. Stich ◽  
P. Heidemeyer ◽  
M. Bastian ◽  
T. Hochrein
Keyword(s):  
Monitoring System ◽  
Wall Thickness ◽  
Plastic Pipe ◽  
Pipe Extrusion

scholarly journals Fluid Elasticity in Plastic Pipe Extrusion: Loads on Die Barrel

2017 ◽  
Vol 32 (5) ◽  
pp. 648-658 ◽  
Author(s):  
C. Saengow ◽  
A. J. Giacomin
Keyword(s):  
Fluid Elasticity ◽  
Plastic Pipe ◽  
Pipe Extrusion
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