Fluid Elasticity in Plastic Pipe Extrusion: Loads on Die Barrel
-
C. Saengow
and A. J. Giacomin
Abstract
In large thick plastic pipe extrusion, the residence time in the cooling chamber is long, and the melt inside the pipe sags under its own weight, causing the product to thicken on the bottom (and to thin on the top). To compensate for sag, engineers normally shift the die centerpiece downward. This paper focuses on how this decentering triggers unintended consequences for elastic polymer melts. We employ eccentric cylindrical coordinates, to capture exactly the geometry of our problem, the flow between eccentric cylinders. Specifically, we arrive at an exact analytical expression for the axial and lateral forces on the die barrel using the polymer process partitioning approach, designed for elastic liquids. We choose the Oldroyd 8-constant framework due to its rich diversity of constitutive special cases. Since our main results are in a form of simple algebraic expression along with two sets of curves, they can thus be used not only by engineers, but any practitioner. We close our paper with detailed dimensional worked examples to help practitioners with their pipe die designs.
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Articles in the same Issue
- Contents
- Contents
- Editorial
- Editorial
- Special Issue Contributions – Review Article
- Process Induced Defects in Liquid Molding Processes of Composites
- Special Issue Contributions
- Crystallization of Polymers in Processing Conditions: An Overview
- Modelling of the Plastisol Knife Over Roll Coating Process
- Low Density Polypropylene/Waste Cellulose Fiber Composites by High-Shear Thermo-Kinetic Mixer
- Evaluation of Structures and Morphologies of Recycled PC/PET Blends Fabricated by High-Shear Kneading Processing
- Transient Swell of a High Density Polyethylene Using Adjustable Gap Slit Die
- Effect of Solvent Volatility on Diameter Selection of Bicomponent Nanofibers Produced by Gas Jet Fiber Process Test
- Flow and Thermal History Effects on Morphology and Tensile Behavior of Poly(oxymethylene) Micro Injection Molded Parts
- Tailoring Heat-Seal Properties of Biodegradable Polymers through Melt Blending
- Development of Dispersion during Compounding and Extrusion of Polypropylene/Graphite Nanoplates Composites
- The Grafting of PE-g-MA Chains on Graphene Derivatives to Improve Tensile Properties of Polyethylene
- High-Pressure Preform Foam Blow Molding
- Fluid Elasticity in Plastic Pipe Extrusion: Loads on Die Barrel
- Rheological In-Mold Measurements and Characterizations of Sheet-Molding-Compound (SMC) Formulations with Different Constitution Properties by Using a Compressible Shell Model
- PPS News
- PPS News
- Seikei Kakou Abstracts
- Seikei-Kakou Abstracts
Articles in the same Issue
- Contents
- Contents
- Editorial
- Editorial
- Special Issue Contributions – Review Article
- Process Induced Defects in Liquid Molding Processes of Composites
- Special Issue Contributions
- Crystallization of Polymers in Processing Conditions: An Overview
- Modelling of the Plastisol Knife Over Roll Coating Process
- Low Density Polypropylene/Waste Cellulose Fiber Composites by High-Shear Thermo-Kinetic Mixer
- Evaluation of Structures and Morphologies of Recycled PC/PET Blends Fabricated by High-Shear Kneading Processing
- Transient Swell of a High Density Polyethylene Using Adjustable Gap Slit Die
- Effect of Solvent Volatility on Diameter Selection of Bicomponent Nanofibers Produced by Gas Jet Fiber Process Test
- Flow and Thermal History Effects on Morphology and Tensile Behavior of Poly(oxymethylene) Micro Injection Molded Parts
- Tailoring Heat-Seal Properties of Biodegradable Polymers through Melt Blending
- Development of Dispersion during Compounding and Extrusion of Polypropylene/Graphite Nanoplates Composites
- The Grafting of PE-g-MA Chains on Graphene Derivatives to Improve Tensile Properties of Polyethylene
- High-Pressure Preform Foam Blow Molding
- Fluid Elasticity in Plastic Pipe Extrusion: Loads on Die Barrel
- Rheological In-Mold Measurements and Characterizations of Sheet-Molding-Compound (SMC) Formulations with Different Constitution Properties by Using a Compressible Shell Model
- PPS News
- PPS News
- Seikei Kakou Abstracts
- Seikei-Kakou Abstracts