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Study of Shrinkage and Warpage in Microcellular Co-Injection Molding

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Published/Copyright: March 26, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 21 Issue 4

Abstract

This study investigated the effects of processing conditions on the shrinkage and warpage behavior of a box-shaped, polypropylene part created using a special microcellular co-injection molding process. Results were compared to the shrinkage and warpage of conventional and microcellular injection molded parts. A preliminary study was performed to determine processing condition limits and the steady state conditions for each combination of molding parameters. A 26-1 fractional factorial design of experiments (DOE) was performed utilizing the previously determined processing conditions. The molded parts were measured using an optical coordinate measuring machine (OCMM), which had previously been examined with a repeatability and reproducibility (R&R) study. These measurements were analyzed to determine the processing parameters that had the greatest effect on the shrinkage and warpage (S&W). The results of this analysis indicated that the supercritical fluid content and core-to-skin volume ratio had the greatest effect on the shrinkage and warpage of microcellular co-injection molded parts. The results of the experiment were that a considerable reduction in shrinkage and warpage could be achieved by utilizing microcellular co-injection molding.

∗ Mail address: L.-S. Turng, Polymer Engineering Center, Department of Mechanical Engineering, University of Wisconsin – Madison, 1513 University Avenue, Madison, WI 53706, USA. E-mail:

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Received: 2005-10-27
Accepted: 2006-1-29
Published Online: 2013-03-26
Published in Print: 2006-09-01

© 2006, Hanser Publishers, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Regular Contributed Articles
  4. A Study of Integration of LIGA and M-EDM Technology on the Micro Injection Molding of Super Thin Plates with Micro Through Holes
  5. Carbon Black Filled Polyester as Electrically Conductive Master Batch for Fibers
  6. Tip-clearance Effect on Mixing Performance of Twin Screw Extruders
  7. Structure Development in Melt Spinning and Cold Drawing of Poly(ethylene-co-octene) Copolymer
  8. Effect of Distributor Geometry on Crimp Contraction of PET Side-by-side Bicomponent Fibers
  9. Effect of Compatibilizer Distribution on Thermal and Rheological Properties of Gelatinized Starch/Biodegradable Polyesters Blends
  10. Numerical Simulation of the Effect of Processing Parameters on the Flow Behavior and Break-through Phenomenon in Co-Injection Molding
  11. Study of Shrinkage and Warpage in Microcellular Co-Injection Molding
  12. Melting Temperature Characteristics for Polyethylenes from Crystal Size Distribution
  13. Experimental/Numerical Analysis of Chaotic Advection in a Three-dimensional Cavity Flow
  14. A Numerical Investigation on the Cure Cycle of Composite Brake Blocks
  15. PPS News
  16. PPS News
  17. Seikei-Kakou Abstracts
  18. Seikei-Kakou Abstracts
https://doi.org/10.3139/217.0122

Articles in the same Issue

  1. Contents
  2. Contents
  3. Regular Contributed Articles
  4. A Study of Integration of LIGA and M-EDM Technology on the Micro Injection Molding of Super Thin Plates with Micro Through Holes
  5. Carbon Black Filled Polyester as Electrically Conductive Master Batch for Fibers
  6. Tip-clearance Effect on Mixing Performance of Twin Screw Extruders
  7. Structure Development in Melt Spinning and Cold Drawing of Poly(ethylene-co-octene) Copolymer
  8. Effect of Distributor Geometry on Crimp Contraction of PET Side-by-side Bicomponent Fibers
  9. Effect of Compatibilizer Distribution on Thermal and Rheological Properties of Gelatinized Starch/Biodegradable Polyesters Blends
  10. Numerical Simulation of the Effect of Processing Parameters on the Flow Behavior and Break-through Phenomenon in Co-Injection Molding
  11. Study of Shrinkage and Warpage in Microcellular Co-Injection Molding
  12. Melting Temperature Characteristics for Polyethylenes from Crystal Size Distribution
  13. Experimental/Numerical Analysis of Chaotic Advection in a Three-dimensional Cavity Flow
  14. A Numerical Investigation on the Cure Cycle of Composite Brake Blocks
  15. PPS News
  16. PPS News
  17. Seikei-Kakou Abstracts
  18. Seikei-Kakou Abstracts
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