25 Questions
What type of polymers is compression molding commonly used for?
Thermosetting & elastomer polymers
Which of the following is NOT a characteristic of compression molding?
It is suitable for thermoplastic polymers
What is the name of the lecture that discusses compression molding?
Lecture 11
What is the process that is paired with compression molding in the given text?
Transfer Molding
What is the primary characteristic of compression molding that makes it suitable for thermosetting and elastomer polymers?
Specific molding pressure and temperature
What is compression molding used for?
Forming un-vulcanized polymer
What is the profile of the polymer shaped into during compression molding?
The shape of the mold cavity
What is the most commonly used method for forming un-vulcanized polymer?
Compression molding
What is the purpose of the vertical sprue channel in Pot Transfer Molding?
To inject the charge into the mold cavity
In Plunger Transfer Molding, how is the charge injected into the mold?
By means of a plunger from a heated well
What is the state of the polymer before it is formed into a mold?
Un-vulcanized
What is the primary material used in the compression molding process?
Molding polymer
What is the first step in the Pot Transfer Molding process?
The charge is loaded into the pot
What is the result of the compression molding process?
A polymer with the profile of the mold cavity
What happens to the material inside the mold during the Pot Transfer Molding process?
It is cured
What is the primary purpose of the heat and pressure in the compression molding process?
To cure the molding polymer
What type of parts are typically produced using compression molding?
Parts with complex appearance, high strength, or high impact resistance
What is the purpose of the pot in Pot Transfer Molding?
To store the charge before injection into the mold cavity
What is a characteristic of the compression molding process?
High-volume production and low-cost molding method
What is the term for the pre-measured amount of polymer used in the compression molding process?
All of the above
What is the purpose of the process described?
To assemble electronic components
Which of the following items is NOT typically encapsulated using this process?
Hammer
What type of components are typically encapsulated?
Electrical components
Why are integrated circuits encapsulated?
To protect them from environmental factors
What is the common characteristic of the items listed?
They are all electronic components
Study Notes
Compression Molding
- Compression molding is a widely used molding process for thermosetting and elastomer polymers.
- The process involves squeezing a pre-measured polymer, called a charge or compound, into a preheated mold cavity under heat and pressure until the charge has cured.
- It is a high-volume-production and low-cost molding method, suitable for parts with complex appearance, high strength, or high impact resistance.
- The mold remains closed until the material inside is cured.
Compression Molding Example
- Compression molding is the most widely used method to form un-vulcanized polymer to the profile of a mold cavity.
Transfer Molding Types
- There are two types of transfer molding: Pot Transfer Molding (Pot TM) and Plunger Transfer Molding (Plunger TM).
Pot Transfer Molding
- In Pot Transfer Molding, the charge is injected from a "pot" through a vertical sprue channel into the mold cavity.
- The process involves:
- Loading the charge into the pot
- Pressing the softened polymer into the mold cavity and curing it
- Ejecting the part
- This process is widely used to encapsulate items such as integrated circuits, plugs, connectors, pins, coils, etc.
This quiz covers the basics of compression molding, a widely used process for thermosetting and elastomer polymers. Learn about the principles and applications of compression molding in polymer processing.
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