Process and Structure of Electromagnetic Shielding Plywood Composite Laminated with Carbon Fiber Paper

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/m 2 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.

A Systematic Review of HPM Energy Absorbers for Building Applications

“…Carbon fiber paper (CFP) is a thin-layer shielding material characterised by low density and good adhesion and permeability. This type of absorber was used to produce plywood characterised by good shielding effectiveness [37]. In the latter study, the optimal plywood production parameters were found to be pressing pressure of 1.2 MPa, temperature of 110 ± 5 • C and glue quantity of 380 g/m 2 .…”

“…In the frequency range from 30 MHz to 1 GHz an absorption level of over 30 dB was reached. Thus, CFP is a promising material for the industrial production of wood composites characterised by high shielding effectiveness [37].…”

“…The shielding effect can be achieved using metal shields [32] in the form of plates or nets [34], but to improve their effectiveness, it is worth considering multilayer shields that contain combinations of various metals or alloys (e.g., copper, Mumetal, iron, aluminium, steel) [33]. In addition, the use of composite boards, such as carbon-containing honeycomb gypsum plasterboards [35], mineral wool boards with carbon black addition [36], sandwich boards [38], or carbon fiber paper as used successfully in plywood production [37], can be an effective solution.…”

Electromagnetic Shielding Performance of Nickel Plated Expanded Graphite/Wood Fiber Composite

“…Furthermore, for the development of integrally conductive filled-type wood-based electromagnetic shielding composite with good attenuation performance, metal membrane (Lu et al 2011), metal powders (Liu and Fu 2009), metal mesh (Zhang et al 2004;Liu et al 2010;Su et al 2013), carbon black, carbon fiber (Hou et al 2015), or plated carbon fiber , carbon fiber paper (Yuan et al 2014), and even mineral powder with excellent electromagnetic properties (Su et al 2012) can be mixed or laminated with wood material to manufacture wood composites with high conductivity and high shielding effectiveness. Wood-based electromagnetic shielding composites have excellent characteristics, but also some limitations, such as high density of the composite with metal filler, complicated construction, and the fact that the texture is too hard to mold.…”

Influence of polarization of the walnut plywood in the process of preparation on its water and moisture absorption

“…Therefore, the methods of increase of the adhesive strength of the laminated wood using intensive technologies (for example, by influence of the electric and magnetic fields, ultrasound, etc.) represent particular scientific and practical interest [3][4].…”