Shrink wrapping is a process of covering a product or item with a layer of plastic film that is then heated to shrink tightly around the item, creating a tight, protective seal.

The plastic used in shrink wrapping is typically made of polyethylene or PVC (polyvinyl chloride).Polyethylene is a thermoplastic material that is widely used for shrink wrapping. It is made from ethylene gas and is produced by a process called polymerization, which involves joining together many small molecules called monomers to form a long chain polymer. Polyethylene is highly flexible and has good tensile strength, making it ideal for shrink wrapping applications.

PVC is also a commonly used plastic for shrink wrapping. It is made from vinyl chloride monomers and is produced by polymerization. PVC is highly durable, resistant to chemicals, and has good clarity, making it ideal for shrink wrapping applications where visibility of the product is important.

In summary, shrink wrapping is a process that involves covering an item with a layer of plastic film, which is then heated to create a tight, protective seal. The plastic used in shrink wrapping is typically made of polyethylene or PVC, both of which are thermoplastic materials that can be molded and shaped when heated.