Feed Manufacturing Technology

[Muhammad Zeeshan Asghar]

Calculating the expansion ratio of floating fish feed involves comparing the volume of the expanded feed pellets to the volume of the raw material used. Here’s how to do it:

Steps to Calculate Expansion Ratio

1. Measure Raw Material Volume:

   • Determine the volume of the raw feed material (before extrusion) in cubic centimeters (cc) or milliliters (ml).

2. Extrude the Feed:

   • Process the raw material through the extruder to produce floating fish feed pellets.

3. Measure Expanded Pellet Volume:

   • After extrusion, collect the expanded pellets and measure their volume in the same units (cc or ml).

4. Calculate Expansion Ratio:

   • Use the following formula:

   <math xmlns=”http://www.w3.org/1998/Math/MathML” display=”block”><semantics><mrow><mtext>Expansion Ratio</mtext><mo>=</mo><mfrac><mtext>Volume of Expanded Pellets</mtext><mtext>Volume of Raw Material</mtext></mfrac></mrow><annotation encoding=”application/x-tex”>\text{Expansion Ratio} = \frac{\text{Volume of Expanded Pellets}}{\text{Volume of Raw Material}}</annotation></semantics></math>Expansion Ratio=Volume of Raw MaterialVolume of Expanded Pellets​

Example Calculation

• Volume of Raw Material: 100 cc
• Volume of Expanded Pellets: 300 cc

Using the formula:

<math xmlns=”http://www.w3.org/1998/Math/MathML” display=”block”><semantics><mrow><mtext>Expansion Ratio</mtext><mo>=</mo><mfrac><mrow><mn>300</mn><mtext> cc</mtext></mrow><mrow><mn>100</mn><mtext> cc</mtext></mrow></mfrac><mo>=</mo><mn>3.0</mn></mrow><annotation encoding=”application/x-tex”>\text{Expansion Ratio} = \frac{300 \text{ cc}}{100 \text{ cc}} = 3.0</annotation></semantics></math>Expansion Ratio=100 cc300 cc​=3.0

This means the expansion ratio is 3.0, indicating that the expanded pellets are three times the volume of the raw materials used.

Notes

• Ensure accurate measurements for both raw and expanded volumes for precise calculations.
• The expansion ratio is a critical factor in assessing the quality and performance of floating feed.

[Md kayum]

Feed size -die size/Die size

Example

Feed size:5 mm

Die size: 2 mm

Expansion ratio: 1.50:1

[Firoz Alam]

(Feed Dia size+Length size)/2