Effects of conductive fibers and processing conditions on the electromagnetic shielding effectiveness of injection molded composites
Resource
Polymer Composites 23 (6): 1003-1013
Journal
Polymer Composites
Journal Volume
23
Journal Issue
6
Pages
1003-1013
Date Issued
2002
Date
2002
Author(s)
Yang, S. Y.
Parng, S. H.
Chen, C. Y.
Abstract
This paper investigates the electromagnetic interference shielding effectiveness (EMI SE) of injection molded ABS disks filled with stainless steel fibers (SSF) and nickel-coated graphite fibers (NGF). The effects of fiber type, fiber length and weight percentage on SE were studied. Optical microscope (OM) and scanning electron microscopy (SEM) observations of the fiber distribution and dispersion were used to aid interpretation of the deviation on SE. The effects of processing conditions such as ring gate angles and injection speed on SE and fiber dispersions were also investigated. It is found that the SE of SSF filled disks is better than that of NGF with the same fiber length and weight percentage. The SEM shows that the SSF with severe twists connect with each other to form a three-dimensional network. Nevertheless, the NGF break into straight fragments, which make it difficult to form networks. With the same type of fiber (SSF), the critical concentration of 6mm was similar to that of 4mm. But the SE of 6mm is a little higher than that of 4mm. Minor improvements of SE values were obtained with expanded ring gate angles. Gate design and injection speed both change filling patterns.
Other Subjects
Conductive plastics; Electromagnetic shielding; Electromagnetic wave interference; Optical microscopy; Scanning electron microscopy; Electromagnetic interference shielding effectiveness; Fiber distribution; Fiber length; Nickel-coated graphite fibers; Ring gate angles; Stainless steel fibers; Injection molding
Type
journal article
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