an analysis of plunger temperature during glass parison pressing p. lankeu-ngankeu and e....
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![Page 1: An Analysis of Plunger Temperature during Glass Parison Pressing P. Lankeu-Ngankeu and E. Gutierrez-Miravete Department of Engineering and Science Rensselaer](https://reader034.vdocuments.net/reader034/viewer/2022051619/56649d4d5503460f94a2b98d/html5/thumbnails/1.jpg)
An Analysis of Plunger Temperature during Glass Parison Pressing
P. Lankeu-Ngankeu and E. Gutierrez-MiraveteDepartment of Engineering and Science
Rensselaer at Hartford
![Page 2: An Analysis of Plunger Temperature during Glass Parison Pressing P. Lankeu-Ngankeu and E. Gutierrez-Miravete Department of Engineering and Science Rensselaer](https://reader034.vdocuments.net/reader034/viewer/2022051619/56649d4d5503460f94a2b98d/html5/thumbnails/2.jpg)
Introduction
• Glass container forming is done using two sets of mold: Blank and Blow molds
• There are two main processes used in container forming Blow and Blow and Press and Blow
• The parison is formed in the blank mold and blown into the final bottle shape in the blow mold
• In the Press and Blow process, the parison is created by driving a metal plunger into the loaded gob
• The plunger needs to be at a prescribed operating temperature to avoid causing checks.
Objective: Model the temperature on the plunger outside surface during the pressing cycle of the glass
![Page 3: An Analysis of Plunger Temperature during Glass Parison Pressing P. Lankeu-Ngankeu and E. Gutierrez-Miravete Department of Engineering and Science Rensselaer](https://reader034.vdocuments.net/reader034/viewer/2022051619/56649d4d5503460f94a2b98d/html5/thumbnails/3.jpg)
Glass Bottle Forming Processes
Blow and Blow ProcessPress and Blow Process
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MotivationModeling and Plunger Temperature during Glass Parison Pressing
• Heating of the plunger outside surface due to glass contact.
• Cooling from the cooling tube on the inside surface of the plunger.
• Temperature change on the plunger outside surface due to cyclical contact with the glass gob.
Plunger
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Model Description
• Model of a Emhart Glass Research Center (EGRC) longneck beer plunger
• Two cases:
– A 2D axissymmetric model
– A full 3D model
• 1s duration for gob loading (the glass is not in contact with the plunger surface~cooling cycle).
• 1s duration for parison pressing (the glass rides down on the plunger~heating cycle).
![Page 6: An Analysis of Plunger Temperature during Glass Parison Pressing P. Lankeu-Ngankeu and E. Gutierrez-Miravete Department of Engineering and Science Rensselaer](https://reader034.vdocuments.net/reader034/viewer/2022051619/56649d4d5503460f94a2b98d/html5/thumbnails/6.jpg)
Plunger Geometries (2D and 3D)
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Governing Equation
t
TT
2The heat equation for constant thermo-physical properties:
t
T
z
T
r
T
rr
T
2
2
2
2 1
t
T
z
T
y
T
x
T
2
2
2
2
2
2
),,,( zyxtTT Cp
k
For the 2D axissymmetric case:
For the full 3D case:
Km
Wk
5.44
37850
m
kg
Kkg
JCp
475
![Page 8: An Analysis of Plunger Temperature during Glass Parison Pressing P. Lankeu-Ngankeu and E. Gutierrez-Miravete Department of Engineering and Science Rensselaer](https://reader034.vdocuments.net/reader034/viewer/2022051619/56649d4d5503460f94a2b98d/html5/thumbnails/8.jpg)
• The glass gob is at a temperature of 1273K.
• The initial temperature of the plunger is taken to be 773K.
• Introduce functions Zs(t) to characterize glass motion on the plunger, Zs(t) = 0 when the plunger is not in contact with the glass
Model Assumptions
ttZs2
sin181367.0
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Boundary Conditions
• The plunger inside surface is subjected to convective cooling to keep the plunger temperature down. However, the heat transfer coefficient is doubled at the tip due to impingement.
• The outside surface is subjected to both convection and radiation from the glass
• All other surfaces are insulated
TThTkn
Km
Wh
2)500,250( KT 350
44 TTTThTkn glass
))(05.0( tZszhh plunger ))(05.0( tZszTT plunger
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Mesh and Solution• Using free mesh parameters, 392 elements for 2D axissymmetric
model, less than 30s to compute 10 cycles
• For 3D full model, 23705 elements with around 7min of computation time
• The mesh was refined at the plunger tip
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Results (3D Model)
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Results (2D Model)• The tip of the plunger shows the largest temperature variations
through the 10 heating and cooling cycles.
• The plunger tip heats up more rapidly than the rest of the plunger due to longer glass contact time.
![Page 13: An Analysis of Plunger Temperature during Glass Parison Pressing P. Lankeu-Ngankeu and E. Gutierrez-Miravete Department of Engineering and Science Rensselaer](https://reader034.vdocuments.net/reader034/viewer/2022051619/56649d4d5503460f94a2b98d/html5/thumbnails/13.jpg)
Summary
• The COMSOL model has provided useful insight into the plunger temperature variation examined here.
• Our model uses a simplified glass motion on the plunger surface, We could attempt using motion profiles from the plant
• We do not solve for the internal cooling inside the plunger
• We have a tool that can provide some qualitative reference for monitoring plunger temperature in the future