A knockbox (informally known as a "bash bin", "coffee column", "slam piece" or "bang bang") is a device used to store spent
espresso
Espresso (, ) is a coffee-brewing method of Italian origin, in which a small amount of nearly boiling water (about ) is forced under of pressure through finely-ground coffee beans. Espresso can be made with a wide variety of coffee beans and ...
grounds, called a puck, after a shot of espresso has been pulled.
It is generally made out of stainless steel or plastic, and has a sturdy bar known as a "bash bar", against which a
portafilter
An espresso machine brews coffee by forcing pressurized water near boiling point through a "puck" of ground coffee and a filter in order to produce a thick, concentrated coffee called espresso. The first machine for making espresso was built in ...
is tapped to release the puck. Because the espresso puck is typically very hot after extraction, knockboxes need to be sturdy. Further, they are also subject to repetitive knocking and tapping to dislodge espresso after use, and thus rubber and stainless steel are the most commonly used materials. In various coffee houses they are seen as drawers which are integral within the bar structure, or as stainless steel boxes usually located near the grinder for convenience.
See also
References
Containers
Espresso
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