Cast Stretch Film vs Blown Stretch Film: Key Differences

1. Two manufacturing approaches

Cast film is produced through a flat-die extrusion and chill-roll process. Blown film is extruded through a circular die and inflated into a bubble before cooling. These processes can influence film characteristics, although final performance also depends on resin formulation and processing conditions.

2. Typical handling differences

Cast stretch film is often selected where smooth dispensing and visual clarity are priorities. Blown stretch film may be considered where toughness and load-holding characteristics are important. These are tendencies rather than guaranteed properties of every grade.

3. Noise, clarity and cling

Film unwind noise, clarity, and cling can affect packing operations. Request samples and compare under the same wrapping conditions, especially if barcode visibility, operator comfort, or automated equipment is involved.

4. Choosing for difficult loads

For sharp corners or unstable pallets, evaluate puncture resistance, tear behavior, and containment performance in a trial. Neither manufacturing method should be treated as automatically suitable for every challenging load.

5. Questions for the supplier

Ask for film type, resin grade or product family, thickness, width, roll length, core, net film weight, intended application, and available test results. Share photos and dimensions of your actual pallet loads.

Frequently Asked Questions

Is blown film always stronger than cast film?

No. Specific product formulation and measured properties are more reliable than a broad category label.

Can both be used for export pallets?

Yes, if the selected film and wrapping process meet the shipment’s load-stability requirements.