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不良・失敗
bubble / seed
Japanese: 気泡
Bubbles remaining inside the glass or between layers. Reduce them through layout and bubble squeeze.
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Bubbles (bubble / seed) are air pockets that remain inside the glass or between layers. They are caused by air trapped during the layout process or by gas generated from the substrate.
You can reduce this by adjusting the layering method and performing a "bubble squeeze" (a brief hold at around 660–680°C) to force out air bubbles during the heating process.
This entry is written in Japanese by Rei Chikaoka and translated for readers outside Japan. If something reads oddly, the original is the source of truth.