Mixing Flashcards
Mixing
To create a uniform mix of all ingredients
Unlike liquid is unable to be perfect can vary dependent on mixer
Degree of mixing dependent on
Efficiency of mixer
Volume of mix
What particles are to be mixed in
Viscosity of mixer
Theory of mixing
Must take into account
Hygiene standards and legislation
Allergen I for
Is it easily cleaned
Tumbling mixers
Mixs powders together by dropping them into each other
Must not exceed critical speed as centrifugal forces appear and mixing ceases
Screw type mixers
U shaped trough with two mesh troughs
Vertical screw which screws through contents
Useful for sm particles in bulk materials
Paddle agitator
Adv cheap good rotational flow
Disadvantage only 2 dimensions high vortex risk
Multiple paddle agitators
Adv all round mix
Disadvantage high energy and cost
Propeller impeller
Full mix
High energy
Turbine agitators
Good mix
Very expensive
High viscosity
Kneading material against vessel or other materials to create more sufraces for en corporation
Material does not flow easily so must be brought to blade or blade brought to dough
Planterary mixers
Circles round an axis
Small clearance between bowl and blade
Static
Mixes through the pattern specifically
