Numerical simulation on residual thickness of pipes with curved sections in water-assisted co-injection molding

ABSTRACT The residual thicknesses of the skin and the inner layers are important quality indicators of water‐assisted co‐injection molding (WACIM) process or overflow WACIM (O‐WACIM) parts. At the curved section, the residual thicknesses change significantly. A numerical simulation program based on...

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Bibliographic Details
Published in:Journal of applied polymer science 2015-09, Vol.132 (34), p.np-n/a
Main Authors: Kuang, Tang-Qing, Xu, Bai-Ping, Zhou, Guo-Fa, Turng, Lih-Sheng
Format: Article
Language:English
Subjects:
Bending
Computational fluid dynamics
Computer simulation
Curved
manufacturing
Materials science
Mathematical models
Melts
Molding (process)
Polymers
Process parameters
theory and modeling
thermoplastics
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Summary:ABSTRACT The residual thicknesses of the skin and the inner layers are important quality indicators of water‐assisted co‐injection molding (WACIM) process or overflow WACIM (O‐WACIM) parts. At the curved section, the residual thicknesses change significantly. A numerical simulation program based on the computational fluid dynamics method was developed to simulate the O‐WACIM process. After the numerical simulation program was validated with the experimental results, it was used to study the effects of the bending radii and bending angles on the residual thicknesses of the skin and inner layers of O‐WACIM parts. The results showed that the penetration of the inner melt and water was always close to the inner concave side due to the higher local pressure gradient and temperature. The effects of processing parameters on the residual thicknesses of the skin and inner layers were investigated using the orthogonal simulation method. It was found that the residual thicknesses of the skin/inner layer at the inner concave/outer convex side are mainly influenced by different parameters. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42468.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.42468