成形
One shrinks, and three expand
Japanese: 1枚は縮み、3枚は広がる
When a single sheet of glass is fired, it shrinks; when three or more sheets are fired, it expands. This is due to surface tension. You can predict the shape simply by changing the number of sheets.
One sheet shrinks due to surface tension; two sheets retain their shape almost completely; three or more sheets spread out under their own weight.
Choose the number of sheets based on the desired thickness and shape.
When a single sheet of glass is fired, it shrinks; when three or more sheets are stacked and fired, it expands. Due to surface tension, its behavior changes depending on its thickness.
6 mm (2 sheets) is the balance point. If it’s thinner than this, it shrinks; if it’s thicker, it expands.
If you want to accurately predict the size after firing, the number of layers (thickness) is the most significant factor.
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.