NBC™ Flat Belt - IOM
P/N: 1118140 Rev: 07/29/2020 Page 17 of 129
1.3: NBC TECHNICAL APPLICATIONS
Product delivery (release) following accumulation is always an important application consideration.
The product release rate depends on the release logic, conveyor speed, gaps between products, and
the product length. In all situations that require dense product packing, the conveyor should NOT run
below 125 FPM for cartons and 90 FPM for totes.
Release efficiency is the ratio between conveyor speed (feet per minute) and the product footage
delivered (case feet per minute). One variable is the amount of gaps between products before
release. These gaps are due to product coast when accumulating. (See Coast-ability) Additional gaps
can occur at release dependent on the logic used.
When dense packing in a cool environment (35° to 50°) a minimum speed of 150 FPM is required.
Release Efficiencies
Overall release efficiency with a single continuous release may vary.
• Contact Accumulation
• 40% with Basic Logic (40% product / 60% air)
• 80% with Progressive Logic (80% product / 20% air)
Release efficiencies are dependent on the case size, mix, weight, conveyor speed, whether Basic or
Progressive logic is used with the release operation. When the speed to meet rate using Basic Logic
is over 150 FPM, consider using Progressive Logic
In the progressive release mode for contact accumulation, it is extremely important to
set every 5th logic module to basic.
Discharge Zone
A function module is provided for the discharge bed prior to shipping. If the NBC line is feeding
another NBC line, a release type function module is not required.
Horsepower Principles
The horsepower required for NBC conveyor is based on the effort (in pounds) to pull the belt through
the conveyor (belt pull), turning all the rollers and moving the product at a given speed. Actual
horsepower is based on “effective belt pull”, which includes a factor for belt flexing, bending, and
snubbing.
Coastability
Product coast is affected by many
factors involving the product and
conveyor. When one product does not
coast up to the previous product, a gap
occurs. Some gaps are likely within a
zone. This is not a problem if considered
when determining the conveyor speed.
Factors determining coast are; product bottom - smoothness, firmness, straightness; product weight;
product length relative to zone length; conveyor speed; roller bearing friction, rollers still turning from
previous product movement or rollers which have stopped.
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