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Brochure Site Assembled Spiral Freezer
The more you know the more you will want an Advanced Freezer

Collect this information
What is Needed: Why:
Product to be conveyed__________ This helps with belt selection__________
Length of product as it will travel in the spiral__________ Needed for formula, changing product orientation affects belt length needed__________
Pieces of product per minute__________ Needed for formula, contact us if this can not be easily determined__________
Dwell time in spiral__________ Needed for formula, contact us if this is an unknown factor__________
Pieces across Belt__________ Needed for formula__________
Put the information into the formula

Belt Length Formula

an example
Product: Pizza Crust
Size: 12" diameter
Rate: 100 pieces per minute
Dwell Time: 30 Minutes (cooler)
Pieces Across Belt: Want 3 (makeup line feeding this cooler is 39", want to use 36" wide belt to save floor space, will put 3 across on slight diagonal to accomplish smaller belt width).

= 1450 ft of active belt length needed

Notes on This Example: The Collapse factor of 1.45 is a standard mathematical number based on a standard spiral belt running on a standard cage diameter. If you are running on an oversize cage, contact us for the collapse factor. This 1.45 factor will apply to more than 90% of spirals made.

Determine Belt Width
Belt width selection is made by determining how the products will be loaded onto the spiral, what type of belt is being used and whether the spiral is an upgo or downgo. For downgo spirals add 2" to the belt width for hold down rail. Spiral Loading:

Belt Types
Rod type belts:
(Belt edges are typically not used for product loading)

Flex type grid belts:
(Belt edges are usable for product loading)

Flex type plastic belts:
(Belt edges are usable for product loading)

Hold Down Rails

Hold down rails are commonly used on descending spirals and require and additional 2 inches of belt width.

Belt Width Details
information on all widths and belt lengths per tier, outside frame dimensions, and will assist in the overall size of the spiral unit.

see chart link spiral dimensions

Notes on Example: In this example, a 38" wide belt could easily be used if you chose a flex or plastic belt. A rod type belt would be more difficult, assuming a horizontal loading pattern. A 40" wide rod type belt could be a good choice. This example assumes and ascending spiral.

Determining how many tiers are needed
Tiers are determined by taking active feet needed and dividing by feet per tier. Feet per tier can be seen on the attached charts showing all belt widths for a given radius. In this example, if we use a 38" wide belt with a standard 2.2 radius type belt, we see there is 63.88 ft per tier.

1450 ft needed
= 22.7 tiers needed
63.88 ft per tier

Determine belt radius to be used
2:2 to 1 radius Most standard used
1:7 to 1 radius
1:5 to 1 radius
1:1 to 1 radius
Other (contact us)

If this is a straight through spiral, round out to 23 tiers
If this is a 90-degree discharge spiral, round to 22.25 tiers
If this is a 180-degree discharge spiral, round to 22.50 tiers

The exact final number of tiers can be determined when the final layout of the spiral is made, but typically the layouts change to accommodate the line layout, so this will suffice to go out and get quotes

Determine Tier Pitch Need highest/thickness product to be run in the spiral
This number, is manufacturer specific, but the following guidelines will be accurate enough to determine what is needed for layouts and quotes:
Highest Product to be run + 3.75" = tier pitch
3.75" allows for air movement above the product plus belt support structure and belt thickness. For critical sizing and space considerations, contact us for specific manufacturers support design dimensions.

Taking our 12" pizza crust example, use 1" thickness for the product
Based on this, we have a tier pitch requirement of at least 4.75". From a practical side of design, a more typical tier pitch would be 5.5" or 6", especially if you are using wider belts, which require a person ?s arm to extend into the spiral for maintenance or clearing out products.

Determine Discharge Heights/Overall Heights
Infeed Height: Use 36" 36"
# of tiers X Tier pitch (23 tiers X 6" tier pitch)138" 174"
Rise Factor (use 4 ") 4" 178< "
178 " product discharge height
Top structure height (use 10") 10" 188"
188" Top of Spiral Height

Preliminary Information for you to use in Looking for a spiral
For this application, we need a spiral that has: 1450 ft of active belt
38" wide belt suitable for conveying this product (pizza crust)
23 tiers
6" tier pitch
infeed at 36"
Product discharge at 178"
Top of Spiral frame at 188"
Outside diameter of spiral is 21'8"

OK Now that we have shown you the math...
There is an easier way. just fill in our online form , let us do the math and we will get back to you with our reccomendation and even a quotation.
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Technical info
Accessory Equipment
Freezer Comparisons
Buying Checklist
Belting Selection
Spiral Terminology
Spiral Dimensions
Spiral Sizing
POULTRY INDUSTRY - chicken parts, chicken patties, chicken nuggets, marinated chicken chunk, breaded chicken parts
RED MEAT INDUSTRY - meat patties, meatballs, raw hamburger, breaded fried cuts
SEA FOOD INDUSTRY - breaded fish sticks or patties, raw shrimp, fish fillets, scallops, whole fish
BAKERY PRODUCTS - pizza crust, pie, cookie, pasta, bread dough
PREPARED FOODS - packaged food in trays, shrimp in trays, ice cream cups, products requiring a long retention time.
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