Abstract: A laminated entry and exit material for drilling planar sheets such as printed circuit boards having a metal foil layer bonded to a fibrous core layer with an adhesive containing a particulate lubricant such as graphite or polyethylene glycol and cold or hot pressed. A second metal layer is preferably bonded to the fibrous core layer. The core of one embodiment of the exit material includes a particulate lubricant such as graphite or polyethylene glycol incorporated in the core at the time of manufacture of the core. The circuit board is placed between the entry and exit materials. Drill friction and heat are reduced by the lubricants and the heat sink provided by the foil thereby extending the service life of a drill.
Abstract: A sheet laminate for use in a press lay-up between printed circuit board panels having a steel substrate layer and a copper foil layer releasably bonded with resistance welds and adhesive to at least one surface of the substrate layer.
Abstract: A sheet laminate for use in a press lay-up between printed circuit board panels having a steel substrate layer and a copper foil layer releasibly bonded to at least one surface of the substrate layer.
Abstract: A sheet laminate for use in a press lay-up between printed circuit board panels having a steel substrate layer and a copper foil layer releasibly bonded to at least one surface of the substrate layer.
Abstract: A sheet laminate for use in a press lay-up between printed circuit board panels having a steel alloy substrate layer and a copper foil layer disposed on at least one surface of the substrate layer. The foil layer is attached onto the surface of the substrate layer by a plurality of occurrences of adhesive material disposed along the boundary of the foil layer such that gaps are defined between occurrences of the adhesive material.
Abstract: A sheet laminate for use in a press lay-up between printed circuit board panels having a metal substrate layer and a copper foil layer disposed on at least one surface of the substrate layer. The foil layer is attached onto the surface of the substrate layer by a plurality of metal-to-metal bonds disposed along the boundary of the foil layer such that gaps are defined between the bonds.