Question:
Scraper blade used to scrape dried film from the roller dryer drum is known as:
Scraper blade used to scrape dried film from the roller dryer drum is known as:
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The term "Doctor's blade" is also widely used in the paper and printing industry for the exact same purpose - cleaning a roller.
Updated On: Jul 23, 2026
- More's blade
- Doctor's blade
- Film's blade
- Tangent's blade
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Roller drying (or drum drying) is a method where milk is applied in a thin film onto the surface of a steam-heated rotating drum.
By the time the drum completes a partial revolution, the moisture has evaporated, leaving a dry sheet of milk.
A sharp, specialized blade must then remove this dry film before the drum reaches the feed point again.
Step 2: Detailed Explanation:
In engineering and printing terminology, a blade that removes excess material or finished product from a rotating surface is called a Doctor's Blade.
In a roller dryer, the doctor's blade is positioned against the drum with controlled pressure.
It "scrapes" or "cleaves" the dried milk film from the metal surface.
The dry film then falls into a conveyor (usually a screw conveyor) where it is ground into powder.
The effectiveness of the drying process depends heavily on the sharpness and alignment of the doctor's blade.
If the blade is worn or improperly adjusted, it can leave patches of milk on the drum, leading to scorching or burning (burnt particles in the powder).
The other names listed (More's, Film's, Tangent's) are not standard technical terms for this component.
The doctor's blade is typically made of high-quality tempered steel or specialized alloys to resist the wear caused by the continuous friction against the rotating drum.
Step 3: Final Answer:
The scraper blade is known as the Doctor's blade.
Roller drying (or drum drying) is a method where milk is applied in a thin film onto the surface of a steam-heated rotating drum.
By the time the drum completes a partial revolution, the moisture has evaporated, leaving a dry sheet of milk.
A sharp, specialized blade must then remove this dry film before the drum reaches the feed point again.
Step 2: Detailed Explanation:
In engineering and printing terminology, a blade that removes excess material or finished product from a rotating surface is called a Doctor's Blade.
In a roller dryer, the doctor's blade is positioned against the drum with controlled pressure.
It "scrapes" or "cleaves" the dried milk film from the metal surface.
The dry film then falls into a conveyor (usually a screw conveyor) where it is ground into powder.
The effectiveness of the drying process depends heavily on the sharpness and alignment of the doctor's blade.
If the blade is worn or improperly adjusted, it can leave patches of milk on the drum, leading to scorching or burning (burnt particles in the powder).
The other names listed (More's, Film's, Tangent's) are not standard technical terms for this component.
The doctor's blade is typically made of high-quality tempered steel or specialized alloys to resist the wear caused by the continuous friction against the rotating drum.
Step 3: Final Answer:
The scraper blade is known as the Doctor's blade.
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