0000000000801465

AUTHOR

W. Zoetelief

showing 4 related works from this author

No-Flow Temperature in Injection Molding Simulation

2010

Most injection molding simulation packages use the no-flow temperature (NFT) as a means of determining whether the polymer flows or is solid. The NFT is not well defined, and a standard method for measuring it does not exist. A sensitivity analysis of the filling stage has been carried out with two different packages [VISI Flow (Vero Software Limited, Gloucestershire, UK) and Moldflow (Autodesk, Inc., San Rafael, CA)] to estimate the influence of the NFT on the main processing parameters. The NFT has a large influence on the thickness of the frozen layer, but it does not appreciably affect the filling pressure. Because the NFT affects the frozen layer, an effect on the estimation of shrinka…

chemistry.chemical_classificationSettore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciSettore ING-IND/24 - Principi Di Ingegneria ChimicaMaterials sciencePolymers and Plasticsinjection moldingFlow (psychology)General ChemistryPolymerMolding (process)Surfaces Coatings and FilmsAmorphous solidCrystallinitySettore ING-IND/22 - Scienza E Tecnologia Dei MaterialichemistryMaterials ChemistryForensic engineeringprocessingSensitivity (control systems)simulationsWell-definedComposite materialShrinkage
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Dependence of Coefficient of volumetric thermal expansion (CVTE) of glass fiber reinforced (GFR) polymers on the glass fiber content

2007

In a Glass Fiber Reinforced (GFR) polymer, the coefficient of volumetric thermal expansion CVTE (determined as a sum of the coefficients of linear thermal expansion CLTE’s for the three principal directions) is sometimes much smaller than the value predictable on the basis of well acquainted models, such as Chow model, taking into account fibers anisotropy and aspect ratio.

chemistry.chemical_classificationMaterials sciencePolymers and PlasticsGlass fiberConcentration effectGeneral ChemistryPolymerCondensed Matter PhysicsAspect ratio (image)Thermal expansionchemistryvisual_artContent (measure theory)Materials Chemistryvisual_art.visual_art_mediumComposite materialPolycarbonateAnisotropyPolymer Bulletin
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No-flow temperature and solidification in injection molding simulation

2011

The no‐flow temperature (NFT) is a parameter representing the rheological solidification temperature of a polymer. A polymer, during injection molding filling stage, can stop its flow because of its high viscosity, although it is not yet fully solidified by means of glass transition or crystallization. The NFT is used in most of injection molding simulation packages: with this simple parameter it is possible to reduce the errors deriving from viscosity extrapolation at relatively low temperatures. The viscosity measurements for polymers are usually carried out at high temperatures, and the viscosity models can fail in prediction at temperatures close to the glass transition or crystallizati…

chemistry.chemical_classificationMaterials scienceinjection molding simulationMolding (process)Polymerlaw.inventionAmorphous solidPhysics::Fluid DynamicsCondensed Matter::Soft Condensed MatterViscosityTemperature dependence of liquid viscositychemistryRheologylawfilling stageCrystallizationComposite materialsolidificationGlass transition
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Thermal expansion of Glass fibre reinforced (GRF) thermoplastics: influence of the nature of the polymer matrix and of the fibre content

2009

Settore ING-IND/24 - Principi Di Ingegneria ChimicaSettore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialiThermal expansion warpage shrinkage injection moulding
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