Question:
Which of the following methods of sealing is a non-contact process that applies an electromagnetic field to heat seal a container with a screw cap which has a heat sealable foil inner seal?
Which of the following methods of sealing is a non-contact process that applies an electromagnetic field to heat seal a container with a screw cap which has a heat sealable foil inner seal?
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Induction heat sealing uses electromagnetic induction to heat the aluminum foil inside a closed cap without direct contact, creating a hermetic, tamper-evident seal on plastic bottles.
Updated On: Jul 23, 2026
- Dielectric sealing
- Ultrasound sealing
- Impulse sealing
- Induction heat sealing
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
Sealing methods in food packaging are designed to create a hermetic seal to prevent contamination, oxygen ingress, and moisture loss.
Sealing can be achieved through direct contact heating or non-contact electromagnetic methods.
Step 2: Detailed Explanation:
Let us analyze each of the sealing techniques listed:
- Dielectric sealing: Uses high-frequency radio waves to heat polar polymers, but requires physical contact with electrodes.
- Ultrasound sealing: Uses high-frequency mechanical vibrations to create friction-induced heat, requiring physical contact with an ultrasonic horn.
- Impulse sealing: Uses a high-resistance wire through which a short pulse of electrical current is passed, requiring direct contact with the sealing jaws.
- Induction heat sealing: This is a non-contact heating process.
- A container is capped with a plastic closure that contains a multi-laminated foil inner seal.
- The capped container passes under an induction coil, which emits an oscillating electromagnetic field.
- This field induces electrical eddy currents in the metallic foil, generating localized heat.
- The heat melts the thermoplastic polymer coating on the underside of the foil, hermetically fusing it to the lip of the container when cooled.
Therefore, induction heat sealing is the non-contact process described.
Step 3: Final Answer:
The non-contact sealing method described is induction heat sealing. Hence, the correct option is (D).
Sealing methods in food packaging are designed to create a hermetic seal to prevent contamination, oxygen ingress, and moisture loss.
Sealing can be achieved through direct contact heating or non-contact electromagnetic methods.
Step 2: Detailed Explanation:
Let us analyze each of the sealing techniques listed:
- Dielectric sealing: Uses high-frequency radio waves to heat polar polymers, but requires physical contact with electrodes.
- Ultrasound sealing: Uses high-frequency mechanical vibrations to create friction-induced heat, requiring physical contact with an ultrasonic horn.
- Impulse sealing: Uses a high-resistance wire through which a short pulse of electrical current is passed, requiring direct contact with the sealing jaws.
- Induction heat sealing: This is a non-contact heating process.
- A container is capped with a plastic closure that contains a multi-laminated foil inner seal.
- The capped container passes under an induction coil, which emits an oscillating electromagnetic field.
- This field induces electrical eddy currents in the metallic foil, generating localized heat.
- The heat melts the thermoplastic polymer coating on the underside of the foil, hermetically fusing it to the lip of the container when cooled.
Therefore, induction heat sealing is the non-contact process described.
Step 3: Final Answer:
The non-contact sealing method described is induction heat sealing. Hence, the correct option is (D).
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