Question:
Which of the following is NOT a vacuum closure used in food packaging?
Which of the following is NOT a vacuum closure used in food packaging?
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Lug caps, PT caps, and pry-off caps are vacuum closures used to seal jars. Crown caps are pressure closures crimped onto bottles to retain carbonation.
Updated On: Aug 7, 2026
- Lug-type or twist cap
- Press-on twist-off cap
- Crown cap
- Pry-off cap
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Vacuum closures are designed to seal glass jars or bottles containing products packaged under a vacuum (such as processed fruits, vegetables, baby food, or sauces).
The vacuum inside the container holds the cap tightly against the sealing rim, ensuring a hermetic seal and serving as a tamper-evident indicator.
Step 2: Detailed Explanation:
Let us evaluate the different closures:
- Lug-type or twist cap: Widely used on glass jars. It features internal lugs that engage with threads on the glass finish, compressing a plastisol gasket under vacuum. (Vacuum closure)
- Press-on twist-off cap (PT cap): Pushed straight down onto the glass finish during steam-vacuum capping.
The thread is formed by the hot plastic liner molding itself to the glass threads. It is held securely by the internal vacuum. (Vacuum closure)
- Pry-off cap: A metal cap with a thick rubber gasket that is pressed onto a threadless glass rim and must be pried off with a tool. It relies on internal vacuum to assist the seal. (Vacuum closure)
- Crown cap: This is a pressure closure.
It features a fluted skirt crimped over the locking ring of a glass bottle finish.
It is designed to contain positive internal pressure from carbonated beverages (such as beer and soda) rather than maintaining an internal vacuum.
Therefore, the crown cap is not classified as a vacuum closure.
Step 3: Final Answer
The correct option is (C).
Vacuum closures are designed to seal glass jars or bottles containing products packaged under a vacuum (such as processed fruits, vegetables, baby food, or sauces).
The vacuum inside the container holds the cap tightly against the sealing rim, ensuring a hermetic seal and serving as a tamper-evident indicator.
Step 2: Detailed Explanation:
Let us evaluate the different closures:
- Lug-type or twist cap: Widely used on glass jars. It features internal lugs that engage with threads on the glass finish, compressing a plastisol gasket under vacuum. (Vacuum closure)
- Press-on twist-off cap (PT cap): Pushed straight down onto the glass finish during steam-vacuum capping.
The thread is formed by the hot plastic liner molding itself to the glass threads. It is held securely by the internal vacuum. (Vacuum closure)
- Pry-off cap: A metal cap with a thick rubber gasket that is pressed onto a threadless glass rim and must be pried off with a tool. It relies on internal vacuum to assist the seal. (Vacuum closure)
- Crown cap: This is a pressure closure.
It features a fluted skirt crimped over the locking ring of a glass bottle finish.
It is designed to contain positive internal pressure from carbonated beverages (such as beer and soda) rather than maintaining an internal vacuum.
Therefore, the crown cap is not classified as a vacuum closure.
Step 3: Final Answer
The correct option is (C).
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