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Consistency and Flexibility of Multi Cavity Melt Control

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Published/Copyright: June 21, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 13 Issue 4

Abstract

The quality of injection moulded products is determined by a complex coupling between polymer properties, mould geometry, and process dynamics. To increase the flexibility and consistency of the injection moulding process, a method was devised to simultaneously control cavity pressure at multiple locations in a mould. This control was achieved by installing multiple dynamic valve stems into the feed system of a hot runner manifold, each of which can control polymer flow. This system was used in a commercial application with four gates to deliver consistent product quality and provide manufacturing-stage flexibility. Across all eleven measured dimensions, the process capability index Cp increased between 50 and 400%. Also, multiple dimensions could be independently and simultaneously adjusted by locally controlling material shrinkage.

* Mail address: D. Kazmer, Assistant Professor, Dept. of Mech. & Ind. Eng., University of Massachusetts Amherst, Eng. Lab. Bldg., Amherst, MA 01003, USA
Received: 1998-2-5
Accepted: 1998-7-23
Published Online: 2013-06-21
Published in Print: 1998-12-01

© 1998, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Fourth in a Series: Pioneers of Polymer Processing Alexander Parkes
  5. Screw Extrusion/Mixing
  6. Flow Analysis in Screw Extruders-Effect of Kinematic Conditions
  7. Distributive Mixing in an Axial Discharge Continous Mixer
  8. Fluid Mechanics of Intermeshing Counter-Rotating Twin Screw Extruders
  9. Stress-Strain and Volume Change Characteristics of an Assemblage of Polymer Pellets
  10. Utilization of Recycled Crumb Rubber as a Compounding Tool
  11. Fibers and Films
  12. Manufacture-Induced Inaccuracies of Spinning Dies1
  13. Modeling of Segmented Polyurethane Drying Process
  14. Roll Coating
  15. Numerical Calculation of the Velocity and Temperature Field in the Reverse Roll Coating
  16. Molding
  17. Simulation of Reactive Liquid Composite Molding
  18. Consistency and Flexibility of Multi Cavity Melt Control
  19. Structure and Properties of Injection Moldings of β-Crystal Nucleator-added PP
  20. Structure and Properties of Injection Moldings of β-Crystal Nucleator-added PP
  21. Warpage of Injection Moulded Plates and Corner Products
https://doi.org/10.3139/217.980398

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Fourth in a Series: Pioneers of Polymer Processing Alexander Parkes
  5. Screw Extrusion/Mixing
  6. Flow Analysis in Screw Extruders-Effect of Kinematic Conditions
  7. Distributive Mixing in an Axial Discharge Continous Mixer
  8. Fluid Mechanics of Intermeshing Counter-Rotating Twin Screw Extruders
  9. Stress-Strain and Volume Change Characteristics of an Assemblage of Polymer Pellets
  10. Utilization of Recycled Crumb Rubber as a Compounding Tool
  11. Fibers and Films
  12. Manufacture-Induced Inaccuracies of Spinning Dies1
  13. Modeling of Segmented Polyurethane Drying Process
  14. Roll Coating
  15. Numerical Calculation of the Velocity and Temperature Field in the Reverse Roll Coating
  16. Molding
  17. Simulation of Reactive Liquid Composite Molding
  18. Consistency and Flexibility of Multi Cavity Melt Control
  19. Structure and Properties of Injection Moldings of β-Crystal Nucleator-added PP
  20. Structure and Properties of Injection Moldings of β-Crystal Nucleator-added PP
  21. Warpage of Injection Moulded Plates and Corner Products
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