Packaging films: liners of bags are usually made from which polymer for flexibility, sealability, and cost?
Chemical Engineering
Polymer Technology
Difficulty: Easy
Choose an option
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APolythene (polyethylene)
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BPVC (polyvinyl chloride)
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CPolypropylene
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DPolyesters
Answer
Correct Answer: Polythene (polyethylene)
Explanation
Introduction / Context:Bag liners require low cost, good heat sealing, chemical resistance, and flexibility. Polyethylene grades (LDPE/LLDPE) dominate due to balanced properties and easy processing.
Concept / Approach:PE offers excellent sealability and toughness; PVC and polyesters are used for specific applications, while PP is common in woven sacks but liners are typically PE for better seal performance at lower temperatures.
Final Answer:Polythene (polyethylene)