| 摘要 |
<p>Production methods capable constantly producing prepreg using a thin skeleton material for ensuring a good laser boring performance, and a thin insulating layer-attached copper foil. A prepreg production method for producing a printed wiring board formed by impregnating a skeleton member with a thermosetting resin, comprising (1) the liquid resin coating forming step of forming a liquid resin layer on a work plane by using a liquid thermosetting resin, (2) the pre-drying step of turning the liquid resin layer into a dry resin layer, (3) the skeleton material pre-bonding step of press-bonding by heating a skeleton member to the dry resin layer to form a skeleton material-attached dry resin layer, (4) the resin impregnating step of heating the skeleton material-attached dry resin layer at a resin-reflowing temperature to impregnate the skeleton material with a resin component, and (5) the cooling step of immediately starting a temperature lowering operation after resin impregnating and maintaining the semi-cured state of the skeleton material-impregnated thermosetting resin for turning into a prepreg state; and a production method for an insulating layer-attached copper foil using similar techniques.</p> |
