Stretch Film – Need To Know

Cast Film

Manufactured using a cast extrusion process, the Cast extrusion process is a continuous process by which a thermoplastic material is melted and extruded through a flat die onto a chill roll, where it is quenched and re-solidified. This process allows the Cast stretch film to have excellent clarity, require less force to stretch, increased tear resistance, unwind quietly from machines, and offer a superior cling. There are both machine grade and hand grade cast stretch film available.

Advantages of Cast Stretch Film- Less expensive than blown stretch film, due to reduced manufacturing costs cast stretch film is more popular. Increased clarity allows users to see wrapped products. Cast stretch wrap unwinds quietly compared to blown stretch wrap. Cast stretch film offers two-sided cling that allows the wrap to stay securely packaged.

Disadvantages of Cast Stretch Film- Does not offer the load/holding power blown stretch film provides. Cast stretch film has less memory and tear resistance than blown stretch film.

Cast film is a great general purpose wrapping solution. It is economical and covers a wide array of applications.

Blown Film

Manufactured using the blown extrusion process, this plastic melt is extruded through an annular slit die, usually vertically, to form a thin-walled tube. Air is introduced from an opening in the center of the die to blow up the film tube like a balloon. On top of the film tube, an air ring blows onto the film to cool it. This process allows blown film to be more robust and more resilient than cast film. The higher mechanical properties of blown film typically allow a more significant load holding power.

Advantages of Blown Stretch Wrap- Offers higher load and stretch capacity. Blown stretch film is a premium quality film. Blown stretch film has a higher degree of memory once stretched, allowing product loads to stay better secured. Higher tear resistance is an advantage when securing loads with sharp edges.

Disadvantages of Blown Stretch Wrap- Higher cost due to the manufacturing process. The blown stretch wrap has poor clarity due to crystallization in the manufacturing process. Blown film is also noisy when unwound from rolls.

Fusion Film

Made from high quality properties, it is much stronger and can be stretched longer. This new technology reduces the use of plastic per pallet by over 70% and is cheaper per metre.

Although thinner than other stretch films, it still has the puncture resistance of a much thicker film. It is the pallet wrapping solution of the future.