Screen-printing process of electromagnetic interference (EMI) shielding materials on mulberry paper

ABSTRACT

A mulberry paper-based electromagnetic interference shielding material with screen-printing process was realized for high shielding effect and mechanical strength. With various film thickness of silver flakes achieved by controlling squeeze depth in the screen printer, the performance of the material was systematically investigated. By adaption of silver flakes on mulberry paper, the shielding effect of the screen-printed electromagnetic interference shielding material revealed over 70 decibels, which is the highest value of shielding effect for X-band. Moreover, after rupture test, 63% higher mechanical strength of 3.26 Mpa on the printed sample was observed compared to commercially available copy paper. As far as we know, this report is the first one related to the printed mulberry paper for electromagnetic interference shielding materials that require high mechanical strength with high shielding effect.

KEYWORDS:

• EMI
• mulberry paper
• screen printing
• squeeze depth
• film thickness
• rupture test
• mechanical strength
• AgFl
• X band

Additional information

Funding

This work was backed by the National Research Foundation of Korea (NRF) with Grant number of NRF-2018R1D1A1D07043938 and was supported by Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea Government (MOTIE) (P0002007).