Transcription of 5-1-1-5 スルーホール内スミア残り ... - jpca.net
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5-1-1-5 スルーホール内スミア残り ... - jpca.net
SR 5-1-1-5 Resin smear in PTH ( ) ( ) Characteristics Resin smear is left between a hole wall conductor and an inner layer conductor of a multilayer printed board. Causes/processes involved/keys to judgment Excessive smear resulted from improper drilling conditions for PTH is not removed in the desmear process and then copper-plated (Hole drilling - through hole plating process) Characteristics A PTH is clogged with a foreign object.
sr 欠陥 シンボルマーク欠陥 めっき欠陥 スルーホール欠陥 機械加工欠陥 その他欠陥 信頼性不足 はんだ上がり欠陥
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