What Is Stretch Film?
Stretch film is a thin, stretchable plastic film, usually made of polyethylene, used for wrapping and securing goods on a pallet. When stretch film is wrapped around a pallet, tension is applied, allowing the film to extend its length by up to 300%.
This tension creates a holding force around the load, helping keep the goods stable and securely positioned during storage, handling and transport.
Types of Stretch Film
There are two main types of stretch film: hand stretch film and machine stretch film.
1. Hand Stretch Film
Hand stretch film is specifically designed to be applied manually. It is usually used for low-volume packaging operations where products or pallets are wrapped by hand.
2. Machine Stretch Film
Machine stretch film is specifically designed to be applied with a stretch wrapping machine. It is typically used in high-volume packaging operations where speed, consistency and optimized film consumption are important.
Cast Stretch Film
Cast stretch film is a transparent stretch film that allows the packaged products to remain clearly visible. It stretches easily and has natural cling on both sides, allowing it to adhere to the products and to itself.
However, its easy stretchability comes at the expense of strength, and it can tear more easily. Considering its advantages and disadvantages, cast stretch film is cheaper than blown stretch film and is used on a much wider scale.
Blown Stretch Film
Blown stretch film is much stronger than other types of stretch film. It is resistant to punctures and tearing, making it suitable for transporting loads with sharp edges.
Blown stretch film can stretch and recover its length, which helps create a much stronger and more secure package around the products.
One disadvantage is that it is not completely transparent, making it more difficult to see the packaged goods. Due to its higher density and strength, blown stretch film is also more expensive.
Pre-Stretch Film
Pre-stretch film is positioned between cast and blown film in terms of properties. It is thinner than traditional blown film, but still offers very high strength.
It stretches relatively easily and recovers its length after stretching. Pre-stretch film makes packaging fast and easy. One of its main advantages is the lower cost per package, which can help reduce overall packaging expenses.
What Is Shrink Film?
Shrink film is a universal polymer material used for primary or secondary packaging of finished products. To apply this material, the film is heated using a heat tunnel or an electric or gas heat gun.
The heating process causes the film to shrink and tightly conform to the shape of the product. This creates strong, reliable and durable packaging that helps preserve the commercial appearance of the product.
Frequently Asked Questions About Stretch Film
What is stretch film used for?
Stretch film is used to wrap and secure goods on pallets, helping stabilize the load during storage, handling and transport.
What is the difference between hand stretch film and machine stretch film?
Hand stretch film is applied manually and is suitable for lower packaging volumes, while machine stretch film is applied with stretch wrapping machines and is used for higher-volume operations.
What is cast stretch film?
Cast stretch film is a clear, easy-to-stretch film with natural cling on both sides. It is widely used because it is cost-effective and allows the packaged goods to remain visible.
When should I use blown stretch film?
Blown stretch film is suitable for heavier or sharper-edged loads because it offers higher strength, puncture resistance and tear resistance.
What is the advantage of pre-stretch film?
Pre-stretch film is strong, easy to apply and helps reduce the cost per package by using less material while still providing reliable load stability.
What is the difference between stretch film and shrink film?
Stretch film is applied by stretching it around the load, while shrink film is applied with heat, causing it to shrink tightly around the product.