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Visualization of the flow history contours at the cross‐section of a weld‐line in an injected molded part
Author(s) -
Fathi Saeed,
Behravesh Amir Hossein
Publication year - 2008
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.28113
Subject(s) - penetration (warfare) , welding , flow visualization , materials science , micrography , obstacle , weld line , flow (mathematics) , vortex , scanning electron microscope , composite material , mechanics , physics , engineering , operations research , political science , law
This article presents visualization of flow history contours at the cross‐section of an injection molded part along the weld‐line originated by an obstacle pin in a plate‐shaped cavity. The visualized flow history contours unveiled the interface of the two adjacent flows through which the penetration of one flow front to the other at the interface was observed. The penetration which was the most at the core of the part behind the obstacle pin was inferred to be originated from an eccentricity in the position of the obstacle pin. Applying image processing techniques, a sequence of the variation in the shape of the interface along the weld‐line was extracted from which the amount of penetration at different distances behind the obstacle was measured. Experimental results revealed an oscillation in the direction of the penetration along the weld‐line at the core of the part. A scanning electron microscope micrography was also applied to characterize the V‐notch along the weld‐line at the surface of the molded part. V‐notch characterization was used to investigate the possible correlation between the internal and external behaviors of the molten plastic during weld‐line formation by which an obstruction affected zone at the weld‐line area behind the obstacle pin was distinguished. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008