Fusible bonding sheet and methods of fabrication thereof

摘要

A fusible adhesive sheet includes a heat-sensitive substrate having a geometrical configuration of intersecting diagonal lines with diamond-shaped voids between the lines. A lattice of pressure-sensitive adhesive is positioned on the substrate and has intersecting diagonal lines with diamond-shaped voids in between the lines in a pattern different from that for the substrate. Removable release liners are provided. In another form, the lattice work of pressure-sensitive adhesive is on a solid substrate of heat-sensitive adhesive. To make the heat-fusible sheet, the heat-sensitive adhesive is fed into the nip between a gravure roller and elastic surfaced roller. The surface of the gravure roller is provided with a series of valleys. The pressure-sensitive adhesive in liquid form is applied to the surface of the gravure roller and deposited onto the heat-sensitive adhesive and cured with heat. In another process the pressure-sensitive adhesive and the heat-sensitive adhesive substrate are separately formed on separate release liners, and thereafter joined. In another process the pressure-sensitive adhesive is applied by spraying it onto the surface of the heat-sensitive substrate.