Study on a Composite Fiberboard with Multiple Electromagnetic Shielding Effectiveness

Abstract

Based on the reflection, absorption and multiple reflection attenuation principle of composite shielding, composite fiberboard with multiple electromagnetic shielding functions was developed according to the structure design, which was made by filling with mineral powder and stainless steel nets, and then sprayed single face with conductive paint. The results show that: electromagnetic shielding effectiveness of the product is above 60dB and reaches the better grade in 18.85MHz-1.46GHz; the product filled with magnetite powder has better comprehensive mechanical properties than the product filled with barite powder, and its modulus of rupture, modulus of elasticity, internal bonding strength and thickness swelling rate of water absorption all reach the Chinese national standards.

Preparation, Characterization, and Antibacterial Properties of Cu-Fibreboards

“…The plates were incubated for 24 h at 30 • C for B. subtilis and 37 • C for E. coli K12, followed by counting the number of colonies on the plate. The measurement of the antibacterial activity of fibreboards was calculated according to Rangelova et al [21]:…”

“…It was reported that the addition of nanoparticles to the surface of materials leads to improved antimicrobial resistance [18,19]. In order to form particles and avoid clustering, it is necessary to stabilize them in a suitable matrix, which will ensure a homogeneous structure and their uniform distribution [20][21][22][23][24][25]. It was reported that copper nanoparticles are a new generation of wood preservative materials that work against decay fungi when they are used instead of conventional copper [17].…”

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.…”

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

“…Carbonized wooden material, such as solid wood panel [15] and fiberboard [16] could also improve SE, which could be further improved with structural designing. 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.…”