| 摘要 |
PURPOSE:To remove the resin burr after sealed with resin without damaging a lead frame by removing the resin burr by hydrogen gas generated through electrolysis. CONSTITUTION:When the lead frames 2 are used as cathodes, an electric cell 21 made of stainless steel is employed as anodes and filled with an alkaline aqueous solution as an electrolyte and electrolysis is conducted, hydrogen 23 is generated from the lead frames 2 as the cathodes and oxygen 24 from the stainless plate 21 as the anodes, and the circumference of the lead frames 2 is changed into an alkaline liquid having high concentration. Since epoxy resin is minutely dissolved into alkali having high concentration, clearances are shaped among the resin burr 3 and the lead frames 2, hydrogen gas generated through the electrolysis of the alkaline aqueous solution intruding into the clearances has mechanical action on the resin burr, the burr is exfoliated from the lead frames and the burr is removed. |
