Question

In the pellet feed manufacture, the following temperature is ideal to heat the feed mixture in the mill

• A. 100 -150 °F
• B. 160 -185 °F
• C. 185 -210 °F
• D. 210 -250 °F

Hint:

Feed Milling Standards: Sinking Pellet Steam Conditioning = $160 - 185^\circ\text{F}$ ($71 - 85^\circ\text{C}$). Floating Extrusion Cooking = $250 - 320^\circ\text{F}$ ($120 - 160^\circ\text{C}$).

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Steam conditioning parameters in aquafeed pellet mill processing: steam pre-conditioning at $160^\circ - 185^\circ ext{F}$ ($71^\circ - 85^\circ ext{C}$) softens feed mash and activates natural carbohydrate binders.
Key Formula or Approach:
\[ \text{Ideal Steam Conditioning Temperature} = 160^\circ - 185^\circ\text{F} \quad (71^\circ - 85^\circ\text{C}) \quad [\text{Moisture } 15 - 17\%] \]

Step 2: Detailed Explanation:
In feed milling technology and pelleted aquafeed processing:
- Pre-conditioning (Steam Conditioning): Prior to entering the pelleting die chamber, dry ground feed mash is treated with live saturated steam in the conditioning chamber.
- The ideal conditioning temperature is 160°F to 185°F (71°C to 85°C) at $15 - 17\%$ moisture.
- This temperature range:
1. Gelatinizes starch on the surface of grain particles, acting as a natural adhesive binder to maximize pellet durability index (PDI) and water stability.
2. Destroys pathogenic vegetative bacteria and antinutritional thermolabile enzyme inhibitors.
3. Lubricates the die to reduce mechanical frictional die wear and electricity consumption.

Step 3: Final Answer:
Thus, the ideal temperature to heat the feed mixture is 160 -185 °F, corresponding to option (B).