Effective joining of partially delignified wood without additional adhesives using a parchmentising approach with zinc dichloride solution

Abstract This study presents a joining of partially delignified wood treated with a concentrated ZnCl 2 solution (parchmentising) and subsequent calendering similar to the fabrication of vulcanised cellulose paper materials. Spruce and beech wood were partially delignified with sodium chlorite to liberate the cellulose for surface bonding. Microscopic analyses reveal an intimate bond line showing the effectiveness of the adhesive-free joining. The average tensile shear strength was 6.6 MPa for spruce and 4.7 MPa for beech.