Cast Stretch Film verse Blow Stretch Film

Cast and blown stretch films are both commonly used in packaging applications, but they have distinct manufacturing processes and properties.

Cast Stretch Film

• Manufacturing Process: The plastic material is poured onto a chill roll, where it solidifies into a flat sheet.
• Characteristics:
  • Known for its clarity and smoothness.
  • Often used for applications requiring a high level of visual appeal, such as food packaging.
  • Generally quieter during application, making it suitable for noise-sensitive environments.
  • May have slightly lower puncture resistance compared to blown stretch film.

Blown Stretch Film

• Manufacturing Process: The plastic material is heated and extruded through a circular die, forming a tubular shape that is then stretched and flattened.
• Characteristics:
  • Offers excellent puncture resistance, making it suitable for heavy-duty packaging applications.
  • Can be produced with a wider range of thicknesses and gauges.
  • May have a slightly rougher surface compared to cast stretch film.
  • Can be more noisy during application, especially at higher speeds.

Choosing the Right Film

The best choice between cast and blown stretch film depends on the specific requirements of your application. Consider the following factors:

• Clarity: If visual appeal is important, cast stretch film may be preferred.
• Puncture Resistance: For heavy-duty packaging, blown stretch film offers superior puncture resistance.
• Noise: If noise is a concern, cast stretch film may be a better option.
• Thickness and Gauge: Blown stretch film can be produced in a wider range of thicknesses and gauges.

By understanding the differences between cast and blown stretch film, you can select the most appropriate type for your packaging needs.

Cast stretch film is a type of stretch wrap that is made using a cast extrusion process: Process A molten thermoplastic material is forced through a slot die, then fed onto a chilled roll to solidify. Properties Cast stretch film is transparent, has a uniform thickness, and is quiet when unwound. It also has a strong cling and is cost-effective. Uses Cast stretch film is ideal for labeling and barcode reading because of its clarity. It's also suitable for environments where noise is a factor. Comparison to blown stretch film Blown stretch film is stronger than cast stretch film, and is better for heavy or sharp loads. However, cast stretch film is less expensive and generates less waste. When to use When choosing a stretch film, consider the load weight and shape, as well as how many pallets you'll be wrapping per day.