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The Difference Between Cast and Blown Stretch Wrap

At Monster Packaging we are committed to helping you make an informed decision on the right products to buy.  Below is a guide to which stretch wrap film will best fit your needs.

  Blown Stretch Film Cast Stretch Film
Holding Power:
  • Produces more load retention
  • More force to stretch and restretching film is difficult
  • Stretches easily
  • Restretching is possible after applied, but product can shift more easily during transit
Memory:
  • After stretching, is more likley to shrink back close to original size
  • Ability to shrink back to original size is very minimal
Yield:
  • Stretches further than cast film, but requires more force to achieve more stretching
  • Will cover more pallets while using less film than cast film
  • Stretching can be acquired much more easily through lower micron blown film
  • Will use more material to cover the same amount of pallets
Puncture/Tear Resistance:
  • Superior tear resistance due to thickness of product
  • When stretched too much, typical tearing can occur
Cling:
  • One sided cling, which produces higher load retention
  • Will not stick to other pallets during transit
  • Cling on both sides, but has lower amount of cling than blown film
  • Likely to stick to other pallets during transit causing tears in film and shifting products
Clarity:
  • Hazy, dull, not clear to read
  • Very clear and easy to read
Gloss:
  • Less gloss decreases reflections with warehouse lighting
  • Generates more gloss, which makes reflections irritating
Noise on unwind:
  • Loud when unwound from roll
  • Much more quiet when being unwound from coil

Stretch wrap film has many different qualities.  Depending on your specific needs, will depend on what type of stretch film is right for you.  Your stretch wrapping process will depend on freight size, required operation performance, and how much you are willing to spend on the quality of product you are looking for.  Below you will read about stretch film that will help you decide which is best for you.

Blown Stretch Film

Blown stretch wrap film (blown film) is made using the blown film extrusion process.  This process is when the film is gradually cooled by air.  This is what makes the film look dull and hazy.  You will need ample amount of force to stretch Blown film.  It will want to shrink back to its original size (memory), which in turn produces high holding power.

Blown stretch film is tear resistant and has one sided cling so it will not stick to product, only itself.  Blown hand stretch film is very economical and easy to use.  It is applied manually and is more frequently used in lower capacity packaging operations.  Blown machine stretch film is a quicker process and more efficient than manually applying the film to product.  It can be used on any stretch film machine and provides more security for loads.  Both hand and machine stretch film is loud when unwound from the roll.

Cast Stretch Film

Cast stretch wrap film (cast film or cast wrap) is made using the cast extrusion process.  This process is where the film is cooled at a more rapid pace than the blown film extrusion process.  Cast stretch film is very clear, but generates more gloss than blown stretch film.  It stretches very easily, but shrinking back to its original size is very minimal.

Cast stretch film does secure its load, but is more likely to have shifting of product during transit, especially if film has been stretched too much.  Cast stretch film also has cling on both sides, but the cling is minimal and is likely to stick to other pallets during transit which could cause tearing of the film.

Cast hand stretch film is used manually and cast machine stretch film can be used on all stretch film equipment.  Just like blown stretch film, whichever you prefer, will depend on cost.  Both hand and machine stretch films are much more quiet than blown stretch film when being unwound from the roll. 

 

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