If you're new to packaging, you may need clarification about the difference between stretch and shrink film. After all, if they're both made of plastic - how could they be different?
 
Although shrink and stretch are sometimes used incorrectly and interchangeably, there are significant differences between these two packaging methods.
 

What is a stretch wrap?

Stretch wrapping is a thin stretchable plastic film (usually made of polyethylene) used to lock and secure crated goods to a pallet. When the stretch wrap is wrapped around the pallet, tension is applied, extending the film's length by up to 300%. This tension creates a contraction force around the load, keeping it in place.
 

Types of Stretch Wrap

1. Hand Stretch Film

 
Hand-stretch films are specifically designed for manual applications and are typically used in small-batch packaging operations.
 

2. Machine Stretch Film

 
Machine stretch films are designed explicitly for stretch wrapping machines and are typically used for high-volume packaging operations. Some common types of machine stretch films include.
 
Blown stretch film: Manufactured using a blow molding extrusion process. The process involves blowing heated resin into an air bubble. The bubbles are then converted into rolled sheets and applied to a core tube.
 
Cast Stretch Film: Manufactured using a cast extrusion process. This process involves feeding heated resin into a row of cooled rollers and curing the film.
 
Pre-stretch film: this is the film that is pre-stretched during the manufacturing process.
 
 
 

What is shrink-wrapping?

Shrink wrap, on the other hand, is a plastic film typically used to wrap the product itself (e.g., toys, fresh produce, frozen foods, etc.) rather than a box of goods. When heated, the plastic shrinks to fit any package, creating a tight protective wrap.
 

Types of Shrink Wrapping

There are two common types of shrink wrap.
 
Polyolefin: Virtually odorless, with clarity and appearance, durability, and versatility. Ideal for freezing applications, printable.
 
Polyethylene: Less clarity than other films, but its thicker properties make it durable. Polyethylene tightens around the package when cold air is introduced at the end of the packaging process. It provides excellent protection for the product being shipped.
 
 
 

What are the benefits of stretch wrapping?

1. Reduce shipping damage: Goods being shipped can be subject to various events that can damage them. Stretch wrap is designed to reduce these hazards because it holds the goods tightly to the pallet, so they don't move around too much during transit.
 
2. Protection against bad weather: Stretch film protects goods from environmental damage such as dirt, dust, and moisture.
 
3. Sustainable: Many types of stretch film are recyclable.
 
4. Cost-effective: Stretch film is a cost-effective alternative to other packaging methods, such as strapping.
 
5. Versatile: The elastic properties of the stretch wrap can wrap loads that are oddly shaped or difficult to stack.
 
 

What are the benefits of shrink-wrapping?

1. Product protection: Shrink wrapping prevents the entry of contaminants such as dust and moisture.
 
2. Tamper-proof: Any tampering with the product will be immediately noticed.
 
3. Increase brand space: Many shrink films can be custom printed to include corporate branding.
 
4. Extend shelf life: Shrink films (when used with air-sealed packaging) can extend the shelf life of fresh produce by preserving and preventing spoilage.
 
 
 

Which one do I need?

Whether you need shrink wrap or stretch wrap depends on the product you are packaging. If you're not sure which type of film you need, consider hiring a packaging specialist to examine your packaging operation to help determine the correct film for your application.
 
 

Need help finding the proper packaging solution?

Contact ZhiTeng Plastic Product Co., Ltd today, and we'll provide you with the most reliable stretch film packaging solutions.