The choice between cast and blown stretch wrap depends on specific application requirements and preferences. Both types have distinct characteristics, advantages, and disadvantages.
Cast Stretch Wrap:
Clarity:
Cast stretch wrap is known for its clarity and transparency. This is beneficial when visibility of the wrapped items is important, such as for barcode scanning or product identification.
Quiet Unwinding:
Cast stretch film generally unwinds more quietly than blown film, making it suitable for applications where noise reduction is a consideration.
Glossy Appearance:
Cast film has a glossy finish, providing a more polished appearance to the wrapped pallet or products.
Consistent Thickness:
Cast stretch wrap is produced through a flat die extrusion process, resulting in a consistent thickness across the film. This uniformity can contribute to better load stability.
Higher Cling Levels:
Cast film tends to have higher clarity and cling levels, which can enhance the adhesion of the film to the load.
Easier to Stretch:
Cast stretch film is often easier to stretch during the wrapping process, requiring less force compared to blown film.
Cost-Effective:
Cast stretch wrap is generally more cost-effective than blown film, making it a popular choice for many applications.
Blown Stretch Wrap:
Toughness and Puncture Resistance:
Blown stretch film is known for its toughness and puncture resistance. It is more resistant to tearing and puncturing than cast film, making it suitable for loads with sharp edges or corners.
Higher Force to Stretch:
Blown film typically requires more force to stretch during the wrapping process. While this can make it more challenging to stretch, it also contributes to its strength.
Load Retention:
Blown stretch wrap has excellent load retention characteristics, making it suitable for heavy or irregularly shaped loads.
Cold-Temperature Performance:
Blown film performs well in cold temperatures, making it suitable for applications where the film needs to be applied in a colder environment.
