Abstract
Carbon fiber paper (CFP), a type of flexible planer electromagnetic shielding material with thin thickness, low density, and good adhesion property and permeability, was laminated with wood veneer to produce a plywood composite with good shielding effectiveness (SE). It was found that a hot-press pressure of 1.2 MPa and a double-sized adhesive concentration of 380 g/m2 were most appropriate for the production of CFP plywood composites. SE of plywood composite laminated with single layer CFP was better than that before hot pressed, which result from the formation of three-dimensional and smaller conductive carbon fiber circuitries. The space between two-layer CFPs and the thickness of the surface-layer veneer had significant influence on SE. The SE of the composites laminated with two-layer CFPs was significantly higher than those with one-layer CFPs. The SE in the frequency range of 30 MHz to 1 GHz reached above 30 dB depending on the space between two-layer CFPs and the thickness of the surface veneer, which was sufficient SE for commercialization and the use of plywood composites.
Highlights
Wood is one of the most abundant biological materials, and timber products have been widely used in both structural and nonstructural applications such as furniture and building construction
Wood particles were coated with a layer of nickel by electroless plating technology [1,2,3], and the coated particles were used for the production of particleboards, the shielding effectiveness (SE) of which could reach 40 dB in the frequency range of 10 MHz to 1 GHz [4]
For the second group of plywood composites, double-sided adhesive concentration was 180, 230, 280, 330, 380 and 430 g/m2, respectively, when the surface was bonded with the Carbon fiber paper (CFP), and 280 g/m2 for those glue lines without CFP, press time was 1.2 min/mm, platen temperature was 110±5 °C, and pressure was at 1.2 MPa
Summary
Wood is one of the most abundant biological materials, and timber products have been widely used in both structural and nonstructural applications such as furniture and building construction. It was reported that the SE was higher when the metal nets were laminated on the surface layer than when they were laminated on the interlayer [8] Conducting polymers, such as polyaniline and polypyrrole, were applied in the wooden shielding material by in situ polymerization, and had an SE level above 10 dB in the frequency range of 100 MHz to 3 GHz [13]. It was reported that the fiberboard composite designed with the metal net and conductive coating as reflective material on the two surface layers and barite powder and magnetite powder as an absorbing material in the core layer [17] could obtain an SE of more than 60 dB in the frequency range of 18.85 MHz to 1.46 GHz. The above studies on wooden shielding material could more or less enhance SE. The current study was proposed: the flexible CFP was laminated with wood veneer to produce a kind of electromagnetic shielding plywood composite
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