Pre Mashing tech Flashcards
(18 cards)
What is pre-mashing technology used for?
It is used as part of the mashing process to ensure even grist hydration, minimal husk damage, minimal oxygen pick-up, mash homogeneity, and hygienic operation.
What is the first opportunity to ensure successful mashing?
The pre-masher connects the mashing vessel with the system used to deliver the grist.
What are the objectives of pre-mashing technology? List them.
- Even grist hydration
- Minimal damage to husk material
- Minimal oxygen pick-up
- Mash homogeneity
- Hygienic operation
What is the most rudimentary method of pre-mashing?
Filling a tank with mashing water at the correct temperature and adding grist while agitating.
What problem arises from failing to evenly hydrate grist?
Agglutination, which is the clumping together of particles to form non-dissolvable aggregates.
What is agglutination?
The clumping together of particles to form lumps or balls of dry grist.
What is the function of in-line pre-mashers?
To help hydrate the grist as it falls into the mashing vessel.
How do in-line pre-mashers maximize contact between water and grist?
By ensuring a large interface and turbulent flow between the grist and water.
What is a critical factor for in-line pre-mashers to work effectively?
A sufficient vertical drop for the grist particles and maintaining specific flow rate and pressure of water.
What valves are commonly used in pre-mashers?
- Knife gate valve
- Slide gate valve
What is the role of a spray device in in-line pre-mashers?
It is used for rinsing the pre-masher and supplying detergent during cleaning.
What is a Maitland masher?
An old form of pre-masher that uses a fountain of hot water to mix with the grist.
What is the design principle of a cone pre-masher?
The grist flows over a cone where water is forced through a small aperture.
What does the vortex pre-masher do?
Creates a vortexing film to ensure all grist contacts water and reduces dust.
How does the Steinecker pre-masher work?
Uses vanes on a plate to produce a vortex of water through which grist descends.
What types of mashes are the discussed pre-mashing technologies designed to work with?
- MCVs
- Decoction mashes
Fill in the blank: The pre-mashing technologies discussed are designed to work with _______.
[MCVs and decoction mashes]
True or False: In older manual breweries, water flow and grist flow were controlled automatically.
False
