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Title of Journal: Rheol Acta

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Abbravation: Rheologica Acta

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Springer-Verlag

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DOI

10.1007/978-1-4757-6363-8

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1435-1528

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Flow analysis of the weld line formation during in

Authors: Tham NguyenChung
Publish Date: 2003/12/19
Volume: 43, Issue: 3, Pages: 240-245
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Abstract

To study the weld line formation of colliding flow fronts the filling of a mold cavity was simulated The thermorheological findings were used to investigate the sources of weld line weakness In this way critical areas of the interface in regard to the lack of interdiffusion and the inappropriate molecular orientation were found to be placed near the surface of the finished parts The main source for the weld line weakness seems to be the Vnotch that arises due to the poorly bonded region near the surface in combination with the large shrinkage as a result of extremely high molecular orientations induced at the end of the filling Furthermore the empirical knowledge was confirmed that weld lines are rather more sensitive to the local flow situation than the global processing conditions Melt and mold temperatures can be considered to be the most important factors which influence the weld line strength

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Other Papers In This Journal:
  1. Effect of morphology on the interfacial slip of immiscible polypropylene/polystyrene blends
  2. Amorphous and crystalline states of ultrasoft colloids: a molecular dynamics study
  3. A hierarchical multi-mode MSF model for long-chain branched polymer melts part II: multiaxial extensional flows
  4. Novel bitumen/isocyanate-based reactive polymer formulations for the paving industry
  5. Can dynamical mechanical measurements predict brittle fracture behaviour?
  6. Self-reinforcement of polymers as a consequence of elongational flow
  7. The role of convective constraint release in parallel superposition flows of nearly monodisperse entangled polymer solutions
  8. Influence of the initial cooling temperature on the gelation and yield stress of waxy crude oils
  9. Molecular architecture and linear viscoelasticity of homogeneous ethylene/styrene copolymers
  10. Squeeze flow of soft solids between rough surfaces
  11. Molecular orientation in non-Newtonian flow of dilute polymer solutions around spheres
  12. The contribution of frictional contacts to the shear strength of coarse glass bead powders and slurries
  13. End effects in rotational viscometry II. Pseudoplastic fluids at elevated Reynolds number
  14. Rheological behaviour of a high-melt-strength polypropylene at elevated pressure and gas loading for foaming purposes
  15. The effect of premature wall yield on creep testing of strongly flocculated suspensions
  16. Rheological and morphological properties of PA6/ECO nanocomposites
  17. Orientation distribution in injection molding: a further step toward more accurate simulations
  18. Fractal analysis of viscoelastic data with automated gel point location and its potential application in the investigation of therapeutically modified blood coagulation
  19. Modeling confinement in polymer nanocomposites from linear viscoelasticity data
  20. Linear viscoelasticity of styrenic block copolymers–clay nanocomposites
  21. On exact solutions of the flow equations for Bingham visco-plastic fluids through an eccentric annular cross-section
  22. A computational extensional rheology study of two biofluid systems
  23. Power-law creep and residual stresses in a carbopol gel
  24. Electrorheological response of SnO 2 and Y 2 O 3 nanoparticles in silicon oil
  25. Generation of inkjet droplet of non-Newtonian fluid
  26. Scaling and mesostructure of Carbopol dispersions
  27. Study of the non-isothermal glass fibre drawing process
  28. Influence of molecular parameters on the stress dependence of viscous and elastic properties of polypropylene melts in shear
  29. An error-minimizing approach to inverse Langevin approximations
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