Mechanical Effects in Extrusion: Slit Dies
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J. F. T. Pittman
Abstract
Simulations of the elastic deflection of a 1.2 m slit die under load during the extrusion process have been performed, using the commercial finite element package MARC. The melt pressure distribution needed to assign the loads to the MARC package was previously obtained by a Hele-Shaw based finite element program, and was thus not coupled with the deflection analysis. Existing analytical calculation methods for deflection are also examined. Experiments using production scale machinery have been conducted to record the die deformations under different melt pressures and compared with the computed data. Analytic deflection predictions are shown to be inadequate. The numerical results are fair, but it is clear that coupling of flow and deflection analyses is essential.
© 1995, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Fourteenth in a Series: Pomini SpA: Dynamic International Machinery Manufacturer
- Internal Mixers
- Non-isothermal Dispersive Flow of a Rubber Mixture Inside an Internal Rotor Mixer
- Screw Extrusion/Continuous Mixing
- Solids Conveying and Melting in a Starve Fed Self-wiping Co-rotating Twin Screw Extruder
- Modeling the Residence Time Distribution of a Non-Intermeshing Twin Screw Extruder
- Mixing Ring
- Morphology in Blends of a Thermotropic Liquid Crystalline Polymer and Polypropylene
- Die Extrusion
- Mechanical Effects in Extrusion: Slit Dies
- Fibers and Films
- Relationship of Stresses in Blown-film Processes
- Molding
- Modelling and Experiments of Squeezing Flow of Polymer Melts
- Crystallization Behavior of Carbon Fiber Reinforced Polyamides (I) Dynamic and Isothermal Crystallization
- Structures and Properties of Injection Moldings of β-Crystal Nucleator-Added Polypropylenes
- Forging
- Numerical Simulation of Polymer Forging
- Rapid Communication of Recent Advances
- Unstable Gas Penetrations in Symmetrical Rib Channels During Gas-assisted Injection Molding
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Fourteenth in a Series: Pomini SpA: Dynamic International Machinery Manufacturer
- Internal Mixers
- Non-isothermal Dispersive Flow of a Rubber Mixture Inside an Internal Rotor Mixer
- Screw Extrusion/Continuous Mixing
- Solids Conveying and Melting in a Starve Fed Self-wiping Co-rotating Twin Screw Extruder
- Modeling the Residence Time Distribution of a Non-Intermeshing Twin Screw Extruder
- Mixing Ring
- Morphology in Blends of a Thermotropic Liquid Crystalline Polymer and Polypropylene
- Die Extrusion
- Mechanical Effects in Extrusion: Slit Dies
- Fibers and Films
- Relationship of Stresses in Blown-film Processes
- Molding
- Modelling and Experiments of Squeezing Flow of Polymer Melts
- Crystallization Behavior of Carbon Fiber Reinforced Polyamides (I) Dynamic and Isothermal Crystallization
- Structures and Properties of Injection Moldings of β-Crystal Nucleator-Added Polypropylenes
- Forging
- Numerical Simulation of Polymer Forging
- Rapid Communication of Recent Advances
- Unstable Gas Penetrations in Symmetrical Rib Channels During Gas-assisted Injection Molding
