Question:
Which of the following plastic films is most suitable for shrink packaging applications in the dairy and food industry?
Which of the following plastic films is most suitable for shrink packaging applications in the dairy and food industry?
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Plasticized PVC and specific polyolefins (like LLDPE) are the primary films used for shrink wrapping because of their high orientation and low shrinkage temperatures.
Updated On: Aug 7, 2026
- Plasticized polyvinyl chloride
- Biaxially oriented polypropylene
- Foamed polystyrene
- Metallized low density polyethylene
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Shrink packaging involves wrapping a product in a stretched plastic film that shrinks tightly around the item when heated.
This process requires a film with high orientation stress that is released at relatively low temperatures.
Step 2: Detailed Explanation:
Different plastic films exhibit different behaviors under heat:
- Biaxially oriented polypropylene (BOPP): Although highly oriented, BOPP has high thermal stability and does not shrink readily at lower temperatures, making it better suited for high-clarity overwraps.
- Foamed polystyrene: Lacks the flexible tensile properties required for wrap-around shrinking.
- Plasticized polyvinyl chloride (PVC): This film is widely used for shrink packaging.
The addition of plasticizers gives the PVC chains high flexibility, and the orientation process during manufacturing allows it to shrink uniformly (up to 50% or more) at relatively low temperatures (around 80$^\circ$C to 120$^\circ$C).
This low-temperature shrinkage prevents thermal damage to sensitive dairy and food products while providing a tight, transparent wrap.
Therefore, plasticized PVC is highly suitable for shrink-wrap applications.
Step 3: Final Answer
The correct option is (A).
Shrink packaging involves wrapping a product in a stretched plastic film that shrinks tightly around the item when heated.
This process requires a film with high orientation stress that is released at relatively low temperatures.
Step 2: Detailed Explanation:
Different plastic films exhibit different behaviors under heat:
- Biaxially oriented polypropylene (BOPP): Although highly oriented, BOPP has high thermal stability and does not shrink readily at lower temperatures, making it better suited for high-clarity overwraps.
- Foamed polystyrene: Lacks the flexible tensile properties required for wrap-around shrinking.
- Plasticized polyvinyl chloride (PVC): This film is widely used for shrink packaging.
The addition of plasticizers gives the PVC chains high flexibility, and the orientation process during manufacturing allows it to shrink uniformly (up to 50% or more) at relatively low temperatures (around 80$^\circ$C to 120$^\circ$C).
This low-temperature shrinkage prevents thermal damage to sensitive dairy and food products while providing a tight, transparent wrap.
Therefore, plasticized PVC is highly suitable for shrink-wrap applications.
Step 3: Final Answer
The correct option is (A).
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