Question

Which type of roller is commonly used in the initial break system of a flour mill?

• A. Smooth roller
• B. Corrugated roller
• C. Grooved roller
• D. Sifter roller

Hint:

In dry milling of wheat:
- Break System: Corrugated rolls (differential speed ratio often \(2.5:1\)) to open the kernel.
- Reduction System: Smooth rolls (differential speed ratio often \(1.25:1\)) to pulverize endosperm.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Milling of wheat into flour involves a systematic process of breaking, scraping, and grinding the grain using pairs of counter-rotating steel rolls.
The milling system is divided into the break system and the reduction system.

Step 2: Detailed Explation:
The main objective of the initial break system is to open up the wheat kernel and scrape the endosperm away from the outer bran layer with minimal bran shattering.
To achieve this shearing and tearing action rather than crushing, corrugated rollers (also called break rolls) are used.
These rollers have sharp flutes or corrugations cut along their length.
The two rollers run at different speeds (differential speed) to tear open the grain.
In contrast, smooth rollers are used later in the reduction system to crush and grind the purified endosperm particles into fine flour.

Step 3: Fil Answer:
The correct option is (B).