Automatic sake pressing machine (Assaku-ki).

Automatic sake press. The purpose of this machine is to separate the alcohol from the unfermented rice solids that are left over in the sake mash. Yabuta is a well known brand of sake pressing machine, so this type of machine is often colloquially referred to as a Yabuta despite the manufacturer.

The leftover unfermented rice solids are known as Kasu, which is a by-product of pressing in this machine. Kasubuai is the ratio of left over kasu rice solids. If the Assaku-ki presses with great force, the kasubuai is low. If the Assaku-ki presses gently, the kasubuai is high. A higher kasubuai is generally desired for premium sake.

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