期刊
JOURNAL OF CELLULAR PLASTICS
卷 52, 期 4, 页码 419-439出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/0021955X15577149
关键词
Microcellular injection molding; unfoamed skin layer; formation mechanism; structural characteristics
资金
- Program for Chang Jiang Scholars and Innovative Research Team in University of Ministry of Education of China [IRT0931]
- Research Award Fund for Shandong Province Excellent Innovation Team [2012-136]
The microcellular injection-molded part usually consists of a foamed core region and two unfoamed skin layers on the cross section. This paper investigated the formation process, formation mechanism and structural characteristics of the unfoamed skin layers in microcellular injection-molded part. It is found that the unfoamed skin layers are formed in two processes namely during filling process and after filling process. The shear flow and the fountain flow behaviors of the melt in the filling stage are the main controlling factors on the formation of the unfoamed skin layer in during filling process, and the cooling solidification of the melt in cooling stage is the fundamental reason for the formation of the unfoamed skin layer in after filling process. Further studies found that the unfoamed skin layer in microcellular injection-molded part has two distinct regions, the outer region is a thin frozen layer which contains deformed and broken cells, and the inner region is a relatively thick solid-like layer which has no visible cells in. The unfoamed skin layer has a minimum thickness in the gate location. The whole thickness of the unfoamed skin layer is decreased with the increase of injection speed and mold temperature, but is slightly affected by melt temperature.
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