Overview of Freezing Technologies in Food Processing

The document discusses several freezing technologies utilized in the food industry for preserving perishable items. It highlights the use of cryogenic freezing methods such as tunnel and immersion freezers which offer rapid cooling benefits by employing extremely low temperatures. The text also covers air blast freezing techniques that involve exposing food to cold, circulating air to achieve uniform freezing. These technologies are significant due to their ability to maintain the quality, texture, and nutritional value of frozen foods. Additionally, factors like installation considerations, technical standards, and various applications in different sectors of the food industry are examined. References from multiple sources, including FAO publications and industry-specific guidelines, provide a comprehensive overview of freezing processes.

Running head: Food Processing Technology
FOOD PROCESSING TECHNOLOGY
Name of the Student
Name of the University
Author Note

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Contents
1. Flow Diagram for Meat Pie Production:............................................................................2
2. Standard Operational Procedure of Hobart Mixer:................................................................3
• How it works:..................................................................................................................3
• Safety guides:..................................................................................................................4
Do’s:.......................................................................................................................................5
Don’t:.....................................................................................................................................5
• Images and instruction of the equipment:.......................................................................5
• Cleaning and Maintenance method:..............................................................................20
3: Freezing Food Technologies in Processing:........................................................................20
• The principle of freezing process:.................................................................................20
• The design capacity and working capacity of Refrigerator industrial aspect:..............24
Cryogenic Freezer:...........................................................................................................24
Air Blast Freezer:.............................................................................................................27
Fluidized Bed Freezer:.....................................................................................................30
Setup:....................................................................................................................................31
• Types of Freezing System:............................................................................................32
o Cryogenic:.................................................................................................................32
o Air Blast:...................................................................................................................32
o Fluidized Bed:...........................................................................................................33
Conclusion:..............................................................................................................................34
References:...............................................................................................................................36

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1. Flow Diagram for Meat Pie Production:
Storage Unit for Meat Storage Unit for flour
Dough Mixer
Preparation of Pie Filling
(Mincing, seasoning)
Pie Maker (dough rolled out in the
shape of the shell, stuffed with the
fillings, and sealed)
Baking the Pie
Cooling
Packaging
Storage for prepared
Pie
Water
Spices and
Seasoning
Transportation

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2. Standard Operational Procedure of Hobart Mixer:
Figure 1: Hobart Mixer; source: (Webstaurantstore.com 2018)
• How it works:
The mixer consists of several different parts like the agitator, drip cup-splash guard
assembly, wire cage, attachment hub, control panel, apron, bowl lock lever, bowl support and
mixing bowl. During the standard operating procedure, the wire cage is placed in position,
and the bowl support in lock position. To operate the mixer, the start button should be long
pressed. The bowl support needs to be in ‘mix position’ for mixing and ‘stir position’ for
stirring before the start button is pressed. The Model HL600 has 4 mix speeds and stir speeds
(Stir which is slow, speed 1 which is low, speed 2 which is medium low, speed 3 which is
medium high and speed 4 which is high). HL662 has 5 speed presets (Speed 1 which is slow,
Speed 2 which is low, Meat Grind, Cheese Shred, Vegetable slice).

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Prior to installation of the agitator in the bowl, the bowl support is fully lowered. The
bowl is then positioned such that the alignment pins, left side of the bowl support, fitting in
the holes on the bowl, and then the bowl is put into the lock position on the bowl support.
The agitator is then installed by opening the wire cage, placing the agitator in the bowl in
alignment with the horizontal slot on the agitator using the shaft pins, followed by sliding the
agitator up the shaft until it is latched. The bowl is then raised while the agitator is mixing the
product. To initiate the mixing process, the bowl is placed on the bowl support, ingredients
are put in the bowl, the bowl is then locked, agitator is then placed in the bowl attached to
agitator shaft, and wire cage placed in front centre position, using the arrow button on bowl
switch to get the bowl in mix position. The stir function is used for mixing ingredients.
Stopping the mixer during operation stops the timer too, and is resumed by pressing the start
button is pressed again. The speed selection is displayed on the speed window. To get the
mixer out of hold mode, the time selector must be turned clockwise.
• Safety guides:
Before installation of the device, the electrical services must be tested to ensure it is as
per the specifications for the machine. While placing the mixer in the operating location, it
must be ensured that sufficient space is available around the device so that the operator can
navigate around it while operating the controls, or installing and removing the bowls.
Sufficient space should also be available above and the right of the device to allow the
removal of the top cover for maintenance or servicing. Oil levels must be checked before the
mixer is started. For the electrical connections, the electrical and grounding specifics must be
in compliance to the standard electrical codes. Before executing lockout or tag out
procedures, the electrical power must be disconnected first to prevent accidental
electrocution. During the operation of the device, hands, clothing and utensils must be outside
the bowl, when the agitator is moving inside it. The bowl should not be used without the

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interlocked guarding system in place. While using the power bowl lift to lower the bowl into
the bowl truck, the bowl must be unlocked and swung out slightly.
Do’s:
 Ensure the bowl is firmly placed
 Paddle or whip is secured in position
 Ingredients are in the mixer bowl
 Ensure the Guard Net is closed
 Bowl is raised using the lever on the right side of mixer
 Ensure the mixer is started at the lowest speed, and then increasing it to the desired
speed.
 Timer is set in minutes
 Keeping hands and body away from mixer while it is operational
 After mixing, the speed should be returned to one and lever turned to off position
 Keep the product in a clean container
 The mixer bowl should be lowered, the paddle removed, and mixing bowl is then
cleaned
 Using damp cloth and sanitizer to clean the exterior of the machine and guard net.
Don’t:
 Product should not be added to the mixer while mixer is on. The device should be
stopped before adding anything in it.
 The guard net should always be closed while using the mixer
 Keeping body, clothing or utensils away from the moving mixer.
• Images and instruction of the equipment:

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Figure 2: Parts of Hobart Mixer
Figure 3: Control Panel HL120/HL200

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Figure 4: Control Panel HL600
Figure 5: Control Panel HL662

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Figure 5a: Placement of Bowl- positioning the bowl so that the alignment pins fit in the holes
in the bowl tub
Figure 5b: Placement of Bowl-Placing the slotted tab on the bowl into the lower part of the
pin and placing the bowl in mix position on bowl support

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Figure 6a: Removing the agitator- Holding the agitator to pull the plunger out
Figure 6b: Removing the agitator- Holding the agitator to pull the plunger out

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Figure 7a: Preparation for mixing- placing the agitator in the bowl, attached to the agitator
shaft
Figure 7b: Preparation for mixing- placing the agitator in the bowl, attached to the agitator
shaft