Podcast
Questions and Answers
What is the purpose of the screen in the base of the mill casing?
What is the purpose of the screen in the base of the mill casing?
- To retain material in the mill until sufficient size reduction (correct)
- To separate different sizes of material
- To grind the material further
- To increase the speed of the mill
What happens to the material in the mill until a certain point?
What happens to the material in the mill until a certain point?
- It is discarded
- It is immediately discharged
- It is retained until a sufficient degree of size reduction (correct)
- It is only partially ground
What is a characteristic of the screen in the mill?
What is a characteristic of the screen in the mill?
- It is adjustable
- It is removable
- It is self-classifying (correct)
- It is manual
What is the outcome of the material being retained in the mill?
What is the outcome of the material being retained in the mill?
What is the function of the screen in relation to the material?
What is the function of the screen in relation to the material?
What can heat affect?
What can heat affect?
What can affect the size of a product?
What can affect the size of a product?
What is the effect of heat on thermolabile materials?
What is the effect of heat on thermolabile materials?
What is a characteristic of thermolabile materials?
What is a characteristic of thermolabile materials?
What type of materials are affected by heat?
What type of materials are affected by heat?
What type of pharmaceutical materials have high toughness?
What type of pharmaceutical materials have high toughness?
What is a characteristic of fibrous pharmaceutical materials?
What is a characteristic of fibrous pharmaceutical materials?
Which of the following pharmaceutical materials are NOT characterized by high toughness?
Which of the following pharmaceutical materials are NOT characterized by high toughness?
What is a common property of pharmaceutical materials that are fibrous in nature?
What is a common property of pharmaceutical materials that are fibrous in nature?
Which of the following is a characteristic of many pharmaceutical materials?
Which of the following is a characteristic of many pharmaceutical materials?
What is the result of excessive feed?
What is the result of excessive feed?
What is the opposite of a cushioning effect?
What is the opposite of a cushioning effect?
What occurs when feed is excessive?
What occurs when feed is excessive?
What is the term for too much feed?
What is the term for too much feed?
At what point does maximum size reduction occur?
At what point does maximum size reduction occur?
What type of materials are typically processed using coarse degree of size reduction?
What type of materials are typically processed using coarse degree of size reduction?
What is the purpose of coarse degree of size reduction for tough fibrous materials?
What is the purpose of coarse degree of size reduction for tough fibrous materials?
Which of the following examples is NOT a type of material that requires coarse degree of size reduction?
Which of the following examples is NOT a type of material that requires coarse degree of size reduction?
What is the significance of coarse degree of size reduction in the processing of tough fibrous materials?
What is the significance of coarse degree of size reduction in the processing of tough fibrous materials?
What is the characteristic of materials that require coarse degree of size reduction?
What is the characteristic of materials that require coarse degree of size reduction?
Study Notes
Milling in Pharmaceutical Materials
- Fibrous drugs, such as roots, peels, and wood, exhibit high toughness.
- A screen in the mill casing acts as a self-classifying mechanism, retaining material until a sufficient degree of size reduction is achieved.
- Coarse size reduction is suitable for tough fibrous materials, such as liquorice and rhubarb, prior to extraction.
Factors Affecting Milling
- Heat can affect thermolabile materials during the milling process.
- The size of the product can be controlled, with maximum size reduction occurring under optimal conditions.
Milling Limitations
- Excessive feed can produce a cushioning effect, limiting the milling process.
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Description
This quiz covers the properties of pharmaceutical materials, including their toughness and structure, particularly in fibrous drugs.
